+publisher:"University of Saskatchewan" +contributor:("Boulfiza, Mohamed")

University of Saskatchewan

1. Zacharias, Daniel. Hardware-in-the-Loop Prototype of a Negative Sequence Based Scheme for Turn-to-Turn Fault Detection in Transformers.

Degree: 2013, University of Saskatchewan

URL: http://hdl.handle.net/10388/ETD-2013-12-1347

► During the course of a transformer's operational life, it experiences many challenges to its insulation. Chemical stresses, such as moisture in insulating oil, deteriorate insulation… (more)

▼ During the course of a transformer's operational life, it experiences many challenges to its insulation. Chemical stresses, such as moisture in insulating oil, deteriorate insulation chemically. Mechanical stresses and thermal stresses, such as those experienced during a large external fault, also contribute to weakening a transformer's insulation. Once these stresses have weakened the insulation to the point of breakdown, a fault may occur between windings of the transformer. These faults, known as turn-to-turn faults, are difficult to detect electrically at the terminals of the transformer until they have grown to the point of damaging the transformer beyond repair. Current differential transformer protection is a simple, reliable, and cost effect method of detecting turn-to-turn faults. This method of protection is only able to detect faults involving 10% of the windings or more. The sensitivity of current differential protection is limited as not to cause false tripping due to normal imbalances in current. Such imbalances in current may occur when a tapchanger is used to increase or decrease the voltage on one side of the transformer. Digital current differential relays, which monitor tap changer position, compensate for current imbalances due to tapchanger operation. Other causes of current imbalance include current transformer saturation, magnetizing inrush current, and over-excitation. A transformer is designed to operate continuously at 10% above its rated voltage. In this overexcited state, a current imbalance appears which causes a differential current to be sensed by the current differential relay. This limits the current differential relay's sensitivity as it must be designed to ignore current imbalances due to the aforementioned causes. The current differential transformer protection algorithm, which only makes use of the current magnitude, is based on the principles of an electromechanical relay. Digital relays are capable of computing the negative sequence current on both primary and secondary sides of the transformer along with the phase difference between these two negative sequence currents. By using both phase and magnitude information, negative sequence current could be used to detect turn-to-turn faults involving 3% of the transformer's windings or more. Turn-to-turn faults may still occur even if no current is flowing on one side of the transformer, such as during energization. With no current flowing in the secondary windings of the transformer, negative sequence current based algorithms become insensitive. A transformer is particularly likely to experience a turn-to-turn fault during this time due to the stresses of energization. This thesis introduces a relay prototype, using both negative sequence current and negative sequence voltage, which retains its sensitivity during energization. This prototype was constructed using a micro-controller and an analog-to-digital conversion board. The transformer protection relay algorithm, including all hardware interface code and signal processing… Advisors/Committee Members: Gokaraju, Ramakrishna, Teng, Daniel, Karki, Rajesh, Boulfiza, Mohamed.

Subjects/Keywords: Transformer; Turn-to-Turn Fault; Negative Sequence Voltage; Negative Sequence Current

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APA (6^th Edition):

Zacharias, D. (2013). Hardware-in-the-Loop Prototype of a Negative Sequence Based Scheme for Turn-to-Turn Fault Detection in Transformers. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/ETD-2013-12-1347

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Zacharias, Daniel. “Hardware-in-the-Loop Prototype of a Negative Sequence Based Scheme for Turn-to-Turn Fault Detection in Transformers.” 2013. Thesis, University of Saskatchewan. Accessed October 19, 2019. http://hdl.handle.net/10388/ETD-2013-12-1347.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Zacharias, Daniel. “Hardware-in-the-Loop Prototype of a Negative Sequence Based Scheme for Turn-to-Turn Fault Detection in Transformers.” 2013. Web. 19 Oct 2019.

Vancouver:

Zacharias D. Hardware-in-the-Loop Prototype of a Negative Sequence Based Scheme for Turn-to-Turn Fault Detection in Transformers. [Internet] [Thesis]. University of Saskatchewan; 2013. [cited 2019 Oct 19]. Available from: http://hdl.handle.net/10388/ETD-2013-12-1347.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Zacharias D. Hardware-in-the-Loop Prototype of a Negative Sequence Based Scheme for Turn-to-Turn Fault Detection in Transformers. [Thesis]. University of Saskatchewan; 2013. Available from: http://hdl.handle.net/10388/ETD-2013-12-1347

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Saskatchewan

2. Arjmand, Hanieh 1988-. Quantitative Computed Tomography Based Finite Element Modeling of Normal and Osteoarthritic Knees: In vivo Precision and Preliminary Comparisons.

Degree: 2016, University of Saskatchewan

URL: http://hdl.handle.net/10388/7497

► Osteoarthritis (OA) is a debilitating joint disease which affects nearly 85% of the Canadian population over 75 years of age. OA not only affects cartilage,… (more)

▼ Osteoarthritis (OA) is a debilitating joint disease which affects nearly 85% of the Canadian population over 75 years of age. OA not only affects cartilage, but it also alters subchondral bone (bone underlying cartilage). Altered subchondral bone could be related to OA initiation, progression, and OA-related pain. To help clarify the role of subchondral bone in OA, accurate in vivo methods are needed to monitor subchondral bone mechanical property variations in people living with OA. Subject-specific finite element (FE) modeling has potential to investigate the role of mechanical properties of subchondral bone in OA. However, associated precision errors of FE-derived mechanical properties are not known. The objectives of this study were to 1) develop a subject-specific FE modeling methodology for OA and normal knees, 2) determine the in vivo precision of FE-derived stress/strain distributions and stiffness of the proximal tibia, and 3) determine whether FE-derived metrics discriminate normal and OA knees. Subject-specific FE models were developed for 14 participants (7 OA, 7 normal) with three repeated CT images of knee joint. Von-Mises stress and strain, minimum principal stress and strain, plus structural stiffness outcomes were acquired for each proximal tibia image. Root mean square coefficient of variations (CV%) were used to assess in vivo precision of the FE-based outcomes. Comparisons between OA and normal groups were performed using unpaired t-tests for normally distributed outcomes, and Mann-Whitney U-tests for not normally distributed outcomes. For all the outcomes the average CV% was less than 6.1%. On average, von-Mises stress and minimum principal stress were respectively 65% and 70% higher in OA versus normal knees whereas strain values did not differ. No difference was observed in stiffness values. Thesis results indicate that FE modeling could be used to precisely quantify and differentiate mechanical property variations in normal and OA knees, in vivo. Results suggest that OA and normal bone exhibit dissimilar stress levels but similar strain levels, likely indicating adaptation of bone in response to altered joint mechanics with OA. Advisors/Committee Members: Szyszkowski, Walerian, Boulfiza, Mohamed, Stavness, Ian, Simonson, Carey J..

Subjects/Keywords: Finite element modeling; osteoarthritis; subchondral bone; proximal tibia; knee joint.

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APA (6^th Edition):

Arjmand, H. 1. (2016). Quantitative Computed Tomography Based Finite Element Modeling of Normal and Osteoarthritic Knees: In vivo Precision and Preliminary Comparisons. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/7497

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Arjmand, Hanieh 1988-. “Quantitative Computed Tomography Based Finite Element Modeling of Normal and Osteoarthritic Knees: In vivo Precision and Preliminary Comparisons.” 2016. Thesis, University of Saskatchewan. Accessed October 19, 2019. http://hdl.handle.net/10388/7497.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Arjmand, Hanieh 1988-. “Quantitative Computed Tomography Based Finite Element Modeling of Normal and Osteoarthritic Knees: In vivo Precision and Preliminary Comparisons.” 2016. Web. 19 Oct 2019.

Vancouver:

Arjmand H1. Quantitative Computed Tomography Based Finite Element Modeling of Normal and Osteoarthritic Knees: In vivo Precision and Preliminary Comparisons. [Internet] [Thesis]. University of Saskatchewan; 2016. [cited 2019 Oct 19]. Available from: http://hdl.handle.net/10388/7497.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Arjmand H1. Quantitative Computed Tomography Based Finite Element Modeling of Normal and Osteoarthritic Knees: In vivo Precision and Preliminary Comparisons. [Thesis]. University of Saskatchewan; 2016. Available from: http://hdl.handle.net/10388/7497

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Saskatchewan

3. Cordova Alcivar, Pedro Luis 1990-. Fretting fatigue in steel bolted connections.

Degree: 2018, University of Saskatchewan

URL: http://hdl.handle.net/10388/11851

► The steelwork in a potash mineshaft is subjected to repeated lateral loads due to the lateral motion of the cages and skips that transport personnel,… (more)

▼ The steelwork in a potash mineshaft is subjected to repeated lateral loads due to the lateral motion of the cages and skips that transport personnel, ore, and equipment up and down the mineshaft. As a result, the steel assemblies, including their bolted connections, must be designed to prevent failure due to fatigue. However, due to uncertainty regarding the fatigue behaviour of the connections, designers must take a very conservative approach, which could result in an uneconomical design. The main objective of this research was to determine the fatigue behaviour of slipcritical bolted connections when different bolt types and surface finishes are used. A325 high strength bolts and C50LR Huck tension control bolts were used as the different bolt types. As-received mill scale steel plates (Class A surface finish) and blast-cleaned surfaces with a Cathacoat 302HB coating (Class B surface finish) were used as the different finishes. A digital image correlation system, as well as optical and scanning electron microscopic examination were used to characterize the modes of failure of the specimens. Bolted connections assembled with the Class A surface finish failed due to fretting fatigue damage and crack initiation took place some distance away from the hole in a partial slip region between a stick region adjacent to the bolt hole and a gross slip region further from the hole where the relative motion between the plates was highest. On the other hand, specimens with the Class B surface finish failed due to bending fatigue caused by the eccentricity between the tension forces in the plates in the single-lap bolted joints, and crack initiation took place at the hole edge where the stress concentration was higher. The bolt type did not have a large effect on the fatigue behaviour, except that the tension in the tension control bolts may have been slightly higher, resulting in a slight improvement in the fatigue life. In general, the fatigue life results were lower than those in the S-N curve given in CSA S16-14, differing from the standard curve by an increasing margin as the stress range increased due to the effects of bending within the specimens. Advisors/Committee Members: Wegner, Leon, Boulfiza, Mohamed, MacPhedran, Ian, Akindele, Odeshi.

Subjects/Keywords: Fretting fatigue; slip-critical connections; partial slip regime; steel bolted connections

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APA (6^th Edition):

Cordova Alcivar, P. L. 1. (2018). Fretting fatigue in steel bolted connections. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/11851

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Cordova Alcivar, Pedro Luis 1990-. “Fretting fatigue in steel bolted connections.” 2018. Thesis, University of Saskatchewan. Accessed October 19, 2019. http://hdl.handle.net/10388/11851.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Cordova Alcivar, Pedro Luis 1990-. “Fretting fatigue in steel bolted connections.” 2018. Web. 19 Oct 2019.

Vancouver:

Cordova Alcivar PL1. Fretting fatigue in steel bolted connections. [Internet] [Thesis]. University of Saskatchewan; 2018. [cited 2019 Oct 19]. Available from: http://hdl.handle.net/10388/11851.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Cordova Alcivar PL1. Fretting fatigue in steel bolted connections. [Thesis]. University of Saskatchewan; 2018. Available from: http://hdl.handle.net/10388/11851

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Saskatchewan

4. Borugadda, Anil K 1975-. EXTENDING THE ADJUSTING KINEMATIC PARAMETER APPROACH TO SPATIAL ROBOTIC MECHANISMS.

Degree: 2019, University of Saskatchewan

URL: http://hdl.handle.net/10388/12311

► Robotic mechanisms refer to mechanisms that include at least one varying speed motor (servomotor). Dynamic balancing is a critical issue in designing robotic mechanisms, which… (more)

▼ Robotic mechanisms refer to mechanisms that include at least one varying speed motor (servomotor). Dynamic balancing is a critical issue in designing robotic mechanisms, which affects their accuracy and efficiency. The force and moment from robotic mechanisms can cause vibration motions on the base, which is called the shaking force and shaking moment (including torque), while at the same time causes “small” vibration motions on the body of the mechanism. Several well-known methods are available for decades for balancing the shaking force and shaking moment, including the counter-weight (CW) method, add-of-spring (AOS) method, add-of-linkage (AOL), and adjusting kinematic parameter (AKP). AKP was developed in our group in 1990s; however, it is only applicable to planar robotic mechanisms. The primary objective of this thesis was to extend AKP to spatial robotic mechanisms. A spherical parallel robotic mechanism, which is a type of spatial robotic mechanisms, was chosen as a study vehicle due to their relatively simple kinematics and dynamics. The mechanism is symmetrical consisting of three legs and one mobile platform, where the end effector (e.g., camera orienting device) is mounted. Each leg contains a lower link and an upper link. The equations for force balancing using AKP were derived by (1) writing the position vectors of the COM of mechanisms with respect to the reference point ‘O’, (2) writing the expression of the COM into a form that includes the time-dependent term (Bi) and the non time-dependent term (Ai), and (3) letting all Bi be zero, i.e., Bi=0, which are the equations for force balancing. Simulation was performed by the software called SPACAR developed at TU Delft. The simulation results showed the effectiveness of the AKP approach to spatial spherical mechanisms for force balancing. Another objective of this thesis was to use a combination of AKP and CW to dynamic balance a spherical mechanism. Dynamic balancing includes both force and moment balancing. The condition of moment balancing is that the total angular momentum of the mechanism with respect to a reference point remains zero. The equations for moment balancing were derived with three steps: (1) letting the angular momentum of the mechanism with respect to the center point to zero, which results into an equation; (2) writing this equation into a format that the time-dependent term (Bi) and the term (Ai) that includes the dimension and mass distribution are separate, like A0 + A1B1+A2B2+…+AnBn; (3) letting all Ai be zero. Using SPACAR as the simulation tool, the results again showed the effectiveness of the AKP approach to dynamic balancing for spatial mechanisms. The final objective was to optimize the mechanism which has been force balanced for the minimal shaking moment; this problem is also called partial shaking moment balancing. The problem was formulated by considering the minimization of shaking moment as an objective function while the force balancing equation as a constraint equation. The variables in the optimization… Advisors/Committee Members: Zhang, Chris, Wiens, Travis, Fotouhi, Reza, Boulfiza, Mohamed.

Subjects/Keywords: dynamic balancing; spatial robotic mechanisms

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APA (6^th Edition):

Borugadda, A. K. 1. (2019). EXTENDING THE ADJUSTING KINEMATIC PARAMETER APPROACH TO SPATIAL ROBOTIC MECHANISMS. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/12311

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Borugadda, Anil K 1975-. “EXTENDING THE ADJUSTING KINEMATIC PARAMETER APPROACH TO SPATIAL ROBOTIC MECHANISMS.” 2019. Thesis, University of Saskatchewan. Accessed October 19, 2019. http://hdl.handle.net/10388/12311.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Borugadda, Anil K 1975-. “EXTENDING THE ADJUSTING KINEMATIC PARAMETER APPROACH TO SPATIAL ROBOTIC MECHANISMS.” 2019. Web. 19 Oct 2019.

Vancouver:

Borugadda AK1. EXTENDING THE ADJUSTING KINEMATIC PARAMETER APPROACH TO SPATIAL ROBOTIC MECHANISMS. [Internet] [Thesis]. University of Saskatchewan; 2019. [cited 2019 Oct 19]. Available from: http://hdl.handle.net/10388/12311.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Borugadda AK1. EXTENDING THE ADJUSTING KINEMATIC PARAMETER APPROACH TO SPATIAL ROBOTIC MECHANISMS. [Thesis]. University of Saskatchewan; 2019. Available from: http://hdl.handle.net/10388/12311

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Saskatchewan

5. Amanie, James. Effect of Submerged Arc Welding Parameters on the Microstructure of SA516 and A709 Steel Welds.

Degree: 2011, University of Saskatchewan

URL: http://hdl.handle.net/10388/ETD-2011-07-42

► The effects of submerged arc welding (SAW) current and speed on the microstructures of SA516 grade 70 and A709 grade 50 steel welds were studied… (more)

▼ The effects of submerged arc welding (SAW) current and speed on the microstructures of SA516 grade 70 and A709 grade 50 steel welds were studied in this research. Steel plates 17 mm-thick were submerged arc welded using different welding currents (from 700 to 850 A) and welding speeds (from 5.3 to 15.3 mm/s). The effect of heat input on the weld metal chemistry, morphologies and chemistry of inclusions and nucleation of acicular ferrite (AF), grain boundary ferrite (GBF) and Widmanstatten ferrite (WF) were evaluated. Optical microscopy (OM), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) microanalysis and transmission electron microscopy (TEM) were used to examine the microstructures of the developed weld joints. PAX-it image analysis software program was utilized for quantitative analysis of the microstructures. The results showed that it is difficult to ascribe changes in the microstructure that occurred in the heat affected zone (HAZ) and the weld metal regions to a single welding process parameter. Inclusion analysis revealed two types of inclusions formed in the weld metals for both steels. They are spherical and faceted inclusions. It was also observed that acicular ferrite nucleated only on the spherical inclusions. EDS analysis showed that the two inclusions have different chemical compositions. The results further showed that the total oxygen content of the weld metals of both steels generally increased with welding current, but decreased with increasing welding speed. The prior austenite grain width decreased with increasing welding speed, but increased with increasing welding current (increased heat input). For both SA516 and A709 steel welds, the proportion of acicular ferrite (AF) in the weld metals increased initially, while those of grain boundary ferrite (GBF) and Widmanstatten ferrite (WF) decreased with increasing welding current when welding current was increased from 700 A to 800 A. With further increase in the welding current above 800 A, less acicular ferrite was produced as both GBF and WF proportions increased. However, welding speed did not affect appreciably the amounts of ferrite products in the weld metals. Non-linear regression models were developed using welding current and welding speed to predict the ferrites (AF, GBF, WF) that formed in the weld metals of the two steels. The adequacy of the models was checked by using the F-statistics. Advisors/Committee Members: Yannacopoulos, Spiro, Oguocha, Ikechukwuka, Torvi, David, Odeshi, Akindele, Boulfiza, Mohamed.

Subjects/Keywords: Microstructure; Acicular ferrite; Grain boundary ferrite; Widmanstatten ferrite.

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Amanie, J. (2011). Effect of Submerged Arc Welding Parameters on the Microstructure of SA516 and A709 Steel Welds. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/ETD-2011-07-42

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Amanie, James. “Effect of Submerged Arc Welding Parameters on the Microstructure of SA516 and A709 Steel Welds.” 2011. Thesis, University of Saskatchewan. Accessed October 19, 2019. http://hdl.handle.net/10388/ETD-2011-07-42.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Amanie, James. “Effect of Submerged Arc Welding Parameters on the Microstructure of SA516 and A709 Steel Welds.” 2011. Web. 19 Oct 2019.

Vancouver:

Amanie J. Effect of Submerged Arc Welding Parameters on the Microstructure of SA516 and A709 Steel Welds. [Internet] [Thesis]. University of Saskatchewan; 2011. [cited 2019 Oct 19]. Available from: http://hdl.handle.net/10388/ETD-2011-07-42.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Amanie J. Effect of Submerged Arc Welding Parameters on the Microstructure of SA516 and A709 Steel Welds. [Thesis]. University of Saskatchewan; 2011. Available from: http://hdl.handle.net/10388/ETD-2011-07-42

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Saskatchewan

6. James, Christopher M. Heat and moisture transfer in a bed of gypsum boards.

Degree: 2009, University of Saskatchewan

URL: http://hdl.handle.net/10388/etd-04302009-122626

► Several recent projects in building science have examined the hygric performance of building materials. Most building materials adsorb from and desorb water vapour to their… (more)

▼ Several recent projects in building science have examined the hygric performance of building materials. Most building materials adsorb from and desorb water vapour to their environments. This phenomenon could be used to help control relative humidity fluctuations in buildings, experienced during periods of moisture production such as cooking, washing or bathing. They could also be used to reduce the need for mechanical ventilation and air conditioning to remove excess moisture. To understand how a building material responds to transient changes in relative humidity, testing is required. This thesis outlines the testing performed on gypsum board, a common wall and ceiling finishing material used inside buildings. The effect of paint coatings on the gypsum boards and heat and mass transfer coefficients of the air passing over the gypsum bed was tested. The data produced from these experiments was used to validate several numerical models through an International Energy Agency/Energy Conservation in Buildings and Community Systems (IEA/ECBCS), Annex 41: Whole Building Heat, Air and Moisture Response. The validated models are important for simulating the process of adsorption and desorption in building materials to predict failure in the building envelope and expected indoor air conditions. A sensitivity analysis is also presented which examines the effects of the sorption isotherm and vapour permeability of the gypsum and paints as well as the heat and mass transfer coefficients the boards are exposed to. The sensitivity range used was determined from the tests performed on the gypsum boards and paints which were also performed during the work of Annex 41. The results of this thesis produced a high quality data which can also be used to validate future numerical models. All information required for validation of future models is available such as dimensions of test section, test conditions, material properties and the experimental data. The results show that when designing for passive humidity control in buildings using gypsum boards, the most influential factor is the type of coating or paint applied to the surface. The sensitivity analysis showed that material properties such as vapour permeability and the sorption isotherms, for the expected temperature range, should be well known for increased accuracy of the simulation. The material properties were determined from inter-laboratory testing at 14 different institutions to achieve confident values. The effect of increasing the heat and mass transfer coefficients, over the range of coefficients studied in this thesis, showed negligible differences in the results. The simulated results had very good agreement between the models and were mostly within experimental uncertainty of the measurements. Advisors/Committee Members: Simonson, Carey J., Oguocha, Ikechukwuka N., Boulfiza, Mohamed, Torvi, David A..

Subjects/Keywords: gypsum; experimental validation; moisture transfer; hygroscopic material; building material

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

James, C. M. (2009). Heat and moisture transfer in a bed of gypsum boards. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/etd-04302009-122626

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

James, Christopher M. “Heat and moisture transfer in a bed of gypsum boards.” 2009. Thesis, University of Saskatchewan. Accessed October 19, 2019. http://hdl.handle.net/10388/etd-04302009-122626.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

James, Christopher M. “Heat and moisture transfer in a bed of gypsum boards.” 2009. Web. 19 Oct 2019.

Vancouver:

James CM. Heat and moisture transfer in a bed of gypsum boards. [Internet] [Thesis]. University of Saskatchewan; 2009. [cited 2019 Oct 19]. Available from: http://hdl.handle.net/10388/etd-04302009-122626.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

James CM. Heat and moisture transfer in a bed of gypsum boards. [Thesis]. University of Saskatchewan; 2009. Available from: http://hdl.handle.net/10388/etd-04302009-122626

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Saskatchewan

7. Sapal, Shailza Singh 1985-. Effectiveness of a Natural Pozzolanic Material from Southern Saskatchewan for Cement Replacement in Concrete.

Degree: 2018, University of Saskatchewan

URL: http://hdl.handle.net/10388/11256

► Pozzolans are a category of supplementary cementitious materials that can be used as a partial replacement of portland cement in concrete. Aside from their environmental… (more)

Subjects/Keywords: Cement replacement material; strength; durability.

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APA (6^th Edition):

Sapal, S. S. 1. (2018). Effectiveness of a Natural Pozzolanic Material from Southern Saskatchewan for Cement Replacement in Concrete. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/11256

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Sapal, Shailza Singh 1985-. “Effectiveness of a Natural Pozzolanic Material from Southern Saskatchewan for Cement Replacement in Concrete.” 2018. Thesis, University of Saskatchewan. Accessed October 19, 2019. http://hdl.handle.net/10388/11256.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Sapal, Shailza Singh 1985-. “Effectiveness of a Natural Pozzolanic Material from Southern Saskatchewan for Cement Replacement in Concrete.” 2018. Web. 19 Oct 2019.

Vancouver:

Sapal SS1. Effectiveness of a Natural Pozzolanic Material from Southern Saskatchewan for Cement Replacement in Concrete. [Internet] [Thesis]. University of Saskatchewan; 2018. [cited 2019 Oct 19]. Available from: http://hdl.handle.net/10388/11256.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Sapal SS1. Effectiveness of a Natural Pozzolanic Material from Southern Saskatchewan for Cement Replacement in Concrete. [Thesis]. University of Saskatchewan; 2018. Available from: http://hdl.handle.net/10388/11256

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Saskatchewan

8. Poudyal, Umesh 1982-. Development Length Criteria for Plain and Ransome Bars.

Degree: 2018, University of Saskatchewan

URL: http://hdl.handle.net/10388/8454

► Historical bars such as plain and Ransome bars were used in reinforced concrete structures until about the mid-1950s in the U.S and Canada. Bond provisions… (more)

▼ Historical bars such as plain and Ransome bars were used in reinforced concrete structures until about the mid-1950s in the U.S and Canada. Bond provisions for plain and Ransome bars are not included in the current edition of Canadian and American codes. Twenty-two splice specimens reinforced with either plain, Ransome, or deformed bars were therefore tested monotonically under four-point loading as a part of a multi-year experimental investigation to develop bond provisions for plain and Ransome bars. The reinforcement was cast either in the bottom or top position. Load versus deflection behaviour, cracking patterns, and maximum load attained by all specimens are presented. Moment curvature analysis was performed for the specimens to calculate the tensile resistance of the reinforcement at the maximum load level. Reliability-based provisions for splice and development length were proposed for plain bars from a test database of splice specimens. A comparison of the proposed development length required for plain bars as compared to deformed bars, calculated in accordance with CSA A23.3, suggests that plain bars require fifty percent more development length than deformed bars when cast in the bottom position. However, when reinforcement is cast in the top position, the required development length for plain square and plain round bars is two and three times that for modern deformed bars, respectively. Similarly, reliability-based provisions for splice length were proposed for Ransome bars. A comparison of the proposed splice length of Ransome bars and that calculated for deformed bars in accordance with CSA A23.3 suggests that the bond capacity of Ransome bars closely matches to that of deformed bars when bars are cast in the bottom position. However, the required splice length for Ransome bars is around 25% more than that for modern deformed bars when cast in the top position. Advisors/Committee Members: Feldman, Lisa R, Wegner, Leon D, Boulfiza, Mohamed, Alexander, John.

Subjects/Keywords: development length; historical structures; plain bars; Ransome bars; structural evaluation

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APA (6^th Edition):

Poudyal, U. 1. (2018). Development Length Criteria for Plain and Ransome Bars. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/8454

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Poudyal, Umesh 1982-. “Development Length Criteria for Plain and Ransome Bars.” 2018. Thesis, University of Saskatchewan. Accessed October 19, 2019. http://hdl.handle.net/10388/8454.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Poudyal, Umesh 1982-. “Development Length Criteria for Plain and Ransome Bars.” 2018. Web. 19 Oct 2019.

Vancouver:

Poudyal U1. Development Length Criteria for Plain and Ransome Bars. [Internet] [Thesis]. University of Saskatchewan; 2018. [cited 2019 Oct 19]. Available from: http://hdl.handle.net/10388/8454.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Poudyal U1. Development Length Criteria for Plain and Ransome Bars. [Thesis]. University of Saskatchewan; 2018. Available from: http://hdl.handle.net/10388/8454

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Saskatchewan

9. Owuamanam, Stephen Ifeanyichukwu 1992-. Fabrication and Characterization of Bio-epoxy Eggshell Composites.

Degree: 2019, University of Saskatchewan

URL: http://hdl.handle.net/10388/12306

► Low cost fillers such as mineral limestone (LS) are added to polymers in an effort to improve their properties. Waste eggshells (ES), a by-product of… (more)

▼ Low cost fillers such as mineral limestone (LS) are added to polymers in an effort to improve their properties. Waste eggshells (ES), a by-product of the egg breaking plant industry, contain high content of calcium carbonate (CaCO3) but are generally discarded to landfills at a cost to the company. The use of waste ES as an alternative to mineral LS filler added to bio-epoxy resin was investigated in this study. Untreated and stearic acid (SA) treated ES and LS fillers (5, 10 and 20 wt. %) were used in fabricating bio-epoxy composite materials via a solution mixing method. Chemical analysis of the filler materials, microstructural examination, physical and mechanical properties of the fabricated composites were evaluated. The particle density of ES was found to be smaller than that of LS particles. The average particle size was 21.2 ± 2.0 µm, 11.5 ± 1.0 µm, 25.1 ± 2.2 µm and 12.8 ± 2.2 µm for ES, SA treated ES, LS and SA treated LS, respectively. SEM images showed untreated ES and LS particles varied in shape possibly due to grinding during processing. Both untreated and SA treated fillers had rhombohedral-like morphology. Pores were observed in ES due to its characteristic structure compared to the LS particles, which had no visible pores. Fractured surfaces of the composites showed flat and cleavage features for unfilled bio-epoxy composites compared to filled composites which showed jagged surfaces. The density of the composites increased with increase in filler loading for all filler types. Similarly, the void content and water absorption increased with increase in filler loading with 20 wt. % ES composites having the highest values. XRD analysis indicated the presence of calcite, while ICP-MS showed 88 wt. % ± 0.7 CaCO3 in ES, slightly less than the mineral LS as a result of the residual organic membranes still attached. The tensile strength, flexural strength and Charpy impact toughness of the composites reduced with increase in filler loading. However, the flexural modulus improved with increasing filler loading and was maximum at a filler content of 20 wt. % for all filler types. The Charpy impact energy of unfilled bio-epoxy at – 40 °C dropped appreciably to about 58 % of its room temperature value. Economic analysis showed that ~ 18,117,000 kg of CaCO3 can be recovered from waste ES annually in Canada for various applications and can serve as potential replacement of about 1.00 % of mined mineral LS. This research presents promising results for the use of ES as an alternative to LS in bio-epoxy composites for selected applications such as laminating surfboards and skateboards. Advisors/Committee Members: Cree, Duncan, Odeshi, Akindele G, Oguocha, Ikechukwuka N, Boulfiza, Mohamed.

Subjects/Keywords: Bio-epoxy; Eggshell; Limestone; Calcium Carbonate; Stearic acid; Composite

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APA (6^th Edition):

Owuamanam, S. I. 1. (2019). Fabrication and Characterization of Bio-epoxy Eggshell Composites. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/12306

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Owuamanam, Stephen Ifeanyichukwu 1992-. “Fabrication and Characterization of Bio-epoxy Eggshell Composites.” 2019. Thesis, University of Saskatchewan. Accessed October 19, 2019. http://hdl.handle.net/10388/12306.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Owuamanam, Stephen Ifeanyichukwu 1992-. “Fabrication and Characterization of Bio-epoxy Eggshell Composites.” 2019. Web. 19 Oct 2019.

Vancouver:

Owuamanam SI1. Fabrication and Characterization of Bio-epoxy Eggshell Composites. [Internet] [Thesis]. University of Saskatchewan; 2019. [cited 2019 Oct 19]. Available from: http://hdl.handle.net/10388/12306.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Owuamanam SI1. Fabrication and Characterization of Bio-epoxy Eggshell Composites. [Thesis]. University of Saskatchewan; 2019. Available from: http://hdl.handle.net/10388/12306

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Saskatchewan

10. Yan, Hongzhong. Two–Way Relaying Communications with OFDM and BICM/BICM-ID.

Degree: 2016, University of Saskatchewan

URL: http://hdl.handle.net/10388/ETD-2016-04-2540

► Relay-aided communication methods have gained strong interests in academic community and been applied in various wireless communication scenarios. Among different techniques in relay-aided communication system,… (more)

▼ Relay-aided communication methods have gained strong interests in academic community and been applied in various wireless communication scenarios. Among different techniques in relay-aided communication system, two-way relaying communication (TWRC) achieves the highest spectral efficiency due to its bi-directional transmission capability. Nevertheless, different from the conventional point-to-point communication system, TWRC suffers from detection quality degradation caused by the multiple-access interference (MAI). In addition, because of the propagation characteristics of wireless channels, fading and multipath dispersion also contribute strongly to detection errors. Therefore, this thesis is mainly concerned with designing transmission and detection schemes to provide good detection quality of TWRC while taking into account the negative impacts of fading, multipath dispersion and multiple-access interference. First, a TWRC system operating over multipath fading channels is considered and orthogonal frequency-division multiplexing (OFDM) is adopted to handle the inter-symbol interference (ISI) caused by the multipath dispersion. In particular, adaptive physical-layer network coding (PNC) is employed to address the MAI issue. By analyzing the detection error probability, various adaptive PNC schemes are discussed for using with OFDM and the scheme achieving the best trade-off among performance, overhead and complexity is suggested. In the second part of the thesis, the design of distributed precoding in TWRC using OFDM under multipath fading channels is studied. The objective is to design a distributed precoding scheme which can alleviate MAI and achieve multipath diversity to combat fading. Specifically, three types of errors are introduced when analyzing the error probability in the multiple access (MA) phase. Through analysis and simulation, the scheme that performs precoding in both time and frequency domains is demonstrated to achieve the maximum diversity gains under all types of errors. Finally, the last part of the thesis examines a communication system incorporating forward error correction (FEC) codes. Specifically, bit-interleaved code modulation (BICM) without and with iterative decoding (BICM-ID) are investigated in a TWRC system. Distributed linear constellation precoding (DLCP) is applied to handle MAI and the design of DLCP in a TWRC system using BICM/BICM-ID is discussed. Taking into account the multiple access channel from the terminal nodes to the relay node, decoding based on the quaternary code representation is introduced. Several error probability bounds are derived to aid in the design of DLCP. Based on these bounds, optimal parameters of DLCP are obtained through analysis and computer search. It is also found that, by combining XORbased network coding with successful iterative decoding, the MAI is eliminated and thus DLCP is not required in a BICM-ID system. Advisors/Committee Members: Nguyen, Ha H., Boulfiza, Mohamed, Mehr, Aryan S., Bui, Francis M., Ko, Seok-Bum.

Subjects/Keywords: Two-way relaying; Multiple access; OFDM; BICM; BICM-ID; cooperative; distributed precoding; physical-layer network coding; quaternary decoding

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APA (6^th Edition):

Yan, H. (2016). Two–Way Relaying Communications with OFDM and BICM/BICM-ID. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/ETD-2016-04-2540

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Yan, Hongzhong. “Two–Way Relaying Communications with OFDM and BICM/BICM-ID.” 2016. Thesis, University of Saskatchewan. Accessed October 19, 2019. http://hdl.handle.net/10388/ETD-2016-04-2540.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Yan, Hongzhong. “Two–Way Relaying Communications with OFDM and BICM/BICM-ID.” 2016. Web. 19 Oct 2019.

Vancouver:

Yan H. Two–Way Relaying Communications with OFDM and BICM/BICM-ID. [Internet] [Thesis]. University of Saskatchewan; 2016. [cited 2019 Oct 19]. Available from: http://hdl.handle.net/10388/ETD-2016-04-2540.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Yan H. Two–Way Relaying Communications with OFDM and BICM/BICM-ID. [Thesis]. University of Saskatchewan; 2016. Available from: http://hdl.handle.net/10388/ETD-2016-04-2540

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Saskatchewan

11. Meier, Adam Dale Andrew. Field scale trials of a geosynthetic capillary break.

Degree: 2011, University of Saskatchewan

URL: http://hdl.handle.net/10388/etd-04142011-153338

► This thesis discusses the field testing of a newly-developed product, a geosynthetic capillary break (GCB). The GCB was developed for use in engineered soil covers… (more)

▼ This thesis discusses the field testing of a newly-developed product, a geosynthetic capillary break (GCB). The GCB was developed for use in engineered soil covers when a cover incorporating a capillary break effect would be desirable, but the coarse-grained material (gravel or sand) is unavailable or uneconomical. Engineered soil covers aim to reduce the amount of acid generated from sulphide bearing waste by limiting the ingress of water and/or oxygen. The GCB is a geosynthetic system that is composed of a finely ground rock flour sandwiched between two nonwoven geotextiles and manufactured as a composite layer by needle punching in a process similar to the used for GCL (geosynthetic clay liner). The goal of the GCB is to recreate the capillary break that is achieved with soil layers using a geosynthetic product that is only a few centimetres thick and that can be rolled up and for transportation, The GCB concept has been demonstrated in a previous study (Park, 2005) based on laboratory column studies and computer modelling. The goal of this project was to determine the effectiveness of the GCB when applied at field scale. Four 25 square test plots were constructed at the tailings management area (TMA) of the HudBay Minerals Inc.(HudBay) mine site located near Flin Flon, MB. One plot contained 1 m of cover soil over top of the GCB (Plot A), one contained only 1 m of cover soil (Plot B), one contained 0.3 m of cover soil over top the GCB (Plot C), and one consisted of a conventional capillary break system with 1 m of cover soil over lying 0.2 m of sand. All of the plots, along with a control plot with no cover, were instrumented with water content sensors and gas sampling ports to monitor the movement of water and oxygen through the various covers. Matric suction sensors were also installed in Plots A and B to measure the water suction within the covers. A meteorological station was installed to gather climatic data which was used to develop a water balance for each of the plots. The plots were constructed and instrumented in the fall of 2005. Data was collected and analyzed until spring of 2007. Data from the water content sensors show that the GCB was effective in increasing the water content in the soil portion of the cover system. The suction sensors show that the suction across the GCB drops significantly (40 kPa versus less than 1 kPa) as compared to plots which contain no GCB. Data from the gas concentration sensors show that the plots containing capillary breaks reduce the oxygen flux into the tailings. The plots containing the GCB (Plots A and C) resulted in the lowest flux rates, followed by the sand capillary break (Plot D )and no capillary break (Plot B), respectively. This reduction in oxygen flux will reduce the amount of acid generated from waste, as oxygen is required for the creation of acid mine drainage. Overall the study demonstrated that at field scale that the GCB is effective in limiting the ingress of water and oxygen into the tailings under the observed conditions and… Advisors/Committee Members: Fleming, Ian, Barbour, S.L., Sharma, Jitendrapal, Reeves, Malcolm, Maule, Charles, Boulfiza, Mohamed.

Subjects/Keywords: capillary break; engineered soil cover; geosynthetic

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APA (6^th Edition):

Meier, A. D. A. (2011). Field scale trials of a geosynthetic capillary break. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/etd-04142011-153338

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Meier, Adam Dale Andrew. “Field scale trials of a geosynthetic capillary break.” 2011. Thesis, University of Saskatchewan. Accessed October 19, 2019. http://hdl.handle.net/10388/etd-04142011-153338.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Meier, Adam Dale Andrew. “Field scale trials of a geosynthetic capillary break.” 2011. Web. 19 Oct 2019.

Vancouver:

Meier ADA. Field scale trials of a geosynthetic capillary break. [Internet] [Thesis]. University of Saskatchewan; 2011. [cited 2019 Oct 19]. Available from: http://hdl.handle.net/10388/etd-04142011-153338.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Meier ADA. Field scale trials of a geosynthetic capillary break. [Thesis]. University of Saskatchewan; 2011. Available from: http://hdl.handle.net/10388/etd-04142011-153338

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Saskatchewan

12. Hu, Andy 1985-. DEVELOPMENT OF A KINETIC MODEL FOR STEERABLE CATHETERS FOR MINIMALLY INVASIVE SURGERY.

Degree: 2016, University of Saskatchewan

URL: http://hdl.handle.net/10388/7403

► The steerable catheters have demonstrated many advantages to overcome the limitations of the conventional catheters in the minimally invasive surgery. The motion and force transmission… (more)

▼ The steerable catheters have demonstrated many advantages to overcome the limitations of the conventional catheters in the minimally invasive surgery. The motion and force transmission from the proximal end to distal tip of the catheter have significant effects to the efficiency and safety of surgery. While the force information between the catheter and the body (e.g., vessel) can be obtained by mounting sensors on the distal tip of the catheter, this would be more intrusive and less reliable than the one without the sensors, which is described in this disseration. In addition, the small diameters of the catheters may also restrict the idea of mounting sensors on the distal tip. The other approach to obtain the force information is to infer it from the information outside the body. This will demand an accurate mathematical model that describes the force and motion relation called kinetic model, and unfortunately, such a kinetic model is not available in the literature. In this dissertation, a kinetic model for steerable catheters is presented wich captures the following characteristics of the steerable catheter, namely (1) the geometrical non-linear behavior of the catheter in motion, (2) the deformable pathway, (3) the friction between the catheter and the pathyway, and (4) the contact between the catheter and pathway. A non-linear finite element system (SPACAR) was employed to capture these characteristics. A test-bed was built and an experiment was carried out to verify the developed kinetic model. The following conclusions can be drawn from this dissertation: (1) the developed kinetic model is accurte in comparison with those in literature; (2) the Dahl friction model, the LuGre friction model and the simplified LuGre friction model are able to capture the friction behavior between the catheter and the pathway but the Coulomb friction model fails (as it cannot capture the hysteresis property which has a significant influence on the behavior of the catheter); (3) the developed kinetic model has the potential of being used to optimize the design and operation of steerable catheters with several salient findings that (3a) the maximal contact force between the catheter and the pathway occurs on the tip of the distal part or the connecting part between the distal part and catheter body of the catheter and (3b) the rigidity and length of the distal part are crucial structural parameters that affect the motion and force transmission significantly. There are several contributions made by this dissertation. In the field of the steerable catheter, biomechanics and bio-instrumentation, the contributions are summarized in the following: (1) the approach to develop the kinetic model of the steerable catheter in a complex work environment is useful to model other similar compliant medical devices, such as endoscope; (2) the kinetic model of the steerable catheter can provide the force information to improve the efficiency and safety of MIS (minimally invastive surgery) and to realize the “doctor-assisted” catheter-based… Advisors/Committee Members: Zhang, Chris, Luo, Yigang, Chen, Daniel, Boulfiza, Mohamed, Wu, Fangxiang, Gupta, Madan.

Subjects/Keywords: Steerable Catheter; Modeling; Kinetics; Contact; Continuum Manipulator

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APA (6^th Edition):

Hu, A. 1. (2016). DEVELOPMENT OF A KINETIC MODEL FOR STEERABLE CATHETERS FOR MINIMALLY INVASIVE SURGERY. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/7403

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Hu, Andy 1985-. “DEVELOPMENT OF A KINETIC MODEL FOR STEERABLE CATHETERS FOR MINIMALLY INVASIVE SURGERY.” 2016. Thesis, University of Saskatchewan. Accessed October 19, 2019. http://hdl.handle.net/10388/7403.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Hu, Andy 1985-. “DEVELOPMENT OF A KINETIC MODEL FOR STEERABLE CATHETERS FOR MINIMALLY INVASIVE SURGERY.” 2016. Web. 19 Oct 2019.

Vancouver:

Hu A1. DEVELOPMENT OF A KINETIC MODEL FOR STEERABLE CATHETERS FOR MINIMALLY INVASIVE SURGERY. [Internet] [Thesis]. University of Saskatchewan; 2016. [cited 2019 Oct 19]. Available from: http://hdl.handle.net/10388/7403.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Hu A1. DEVELOPMENT OF A KINETIC MODEL FOR STEERABLE CATHETERS FOR MINIMALLY INVASIVE SURGERY. [Thesis]. University of Saskatchewan; 2016. Available from: http://hdl.handle.net/10388/7403

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Saskatchewan

13. Mohamed, Nedal. Comparative study of the corrosion behaviour of conventional carbon steel and corrosion resistant reinforcing bars.

Degree: 2009, University of Saskatchewan

URL: http://hdl.handle.net/10388/etd-08222009-235722

► Corrosion of reinforced concrete is the most challenging durability problem that threatens reinforced concrete structures, especially structures that are subject to severe environmental conditions (i.e.,… (more)

Subjects/Keywords: polarization; Concrete; Corrosion; Corrosion Resistant Rebars; EIS

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APA (6^th Edition):

Mohamed, N. (2009). Comparative study of the corrosion behaviour of conventional carbon steel and corrosion resistant reinforcing bars. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/etd-08222009-235722

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Mohamed, Nedal. “Comparative study of the corrosion behaviour of conventional carbon steel and corrosion resistant reinforcing bars.” 2009. Thesis, University of Saskatchewan. Accessed October 19, 2019. http://hdl.handle.net/10388/etd-08222009-235722.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Mohamed, Nedal. “Comparative study of the corrosion behaviour of conventional carbon steel and corrosion resistant reinforcing bars.” 2009. Web. 19 Oct 2019.

Vancouver:

Mohamed N. Comparative study of the corrosion behaviour of conventional carbon steel and corrosion resistant reinforcing bars. [Internet] [Thesis]. University of Saskatchewan; 2009. [cited 2019 Oct 19]. Available from: http://hdl.handle.net/10388/etd-08222009-235722.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Mohamed N. Comparative study of the corrosion behaviour of conventional carbon steel and corrosion resistant reinforcing bars. [Thesis]. University of Saskatchewan; 2009. Available from: http://hdl.handle.net/10388/etd-08222009-235722

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Saskatchewan

14. Moazed, Reza. Strength of welded thin-walled square hollow section T-joint connections by FE simulations and experiments.

Degree: 2010, University of Saskatchewan

URL: http://hdl.handle.net/10388/etd-06282010-182509

► Hollow section members are widely used in industrial applications for the design of many machine and structural components. These components are often fabricated at lower… (more)

▼ Hollow section members are widely used in industrial applications for the design of many machine and structural components. These components are often fabricated at lower cost by welding rather than by casting or forging. For instance, in agricultural machinery, the hollow tubes are typically connected together through welding to form T-joints. Such T-joint connections are also employed in other engineering applications such as construction machinery, offshore structures, bridges, and vehicle frames. In this dissertation, the behaviour of tubular T-joint connections, in particular square hollow section (SHS)-to-SHS T-joints, subjected to static and cyclic loads is studied both experimentally and numerically. The techniques used for the fabrication of the T-joint connections can affect their strengths to different degrees. With modern advances in manufacturing technologies, there are many alternatives for the fabrication of the T-joint connections. For instance, in recent years, the use of the laser beam has become increasingly common in industrial applications. From a manufacturing point of view, the T-joint connections can be fabricated by using traditional mechanical cutting or laser cutting techniques. Currently, for the fabrication of the T-joint connections, the straight edge of one tube is cut using mechanical tools (e.g., flame cutting) and then welded to the body of the other tube. A major contribution of this research work is investigating the feasibility of using laser cutting to produce welded square hollow-section T-joints with similar or higher fatigue strengths than their conventional mechanical cut counterparts. For this purpose, a total of 21 full-scale T-joint samples, typical of those found in the agricultural machinery, are included for the study. Finite Element (FE) models of the T-joints manufactured with the different cutting techniques are also developed and the FE results are verified with the experiments. The results of the numerical and experimental study on the full-scale T-joint samples show that the fatigue strength of the samples that are manufactured with laser cutting is higher than those fabricated with conventional mechanical cutting. From a structural analysis view point, despite of the wide use of tubular T-joint connections as efficient load carrying members, a practical but yet simple and accurate approach for their design and analysis is not available. For this purpose, engineers must often prepare relatively complicated and time consuming FE models made up of shell or solid elements. This is because unlike solid-section members, when hollow section members are subjected to general loadings, they may experience severe deformations of their cross-sections that results in stress concentrations in the connection’s vicinity. One of the objectives/contributions of this research work is the better understanding of the behaviour of SHS-to-SHS T-joint connections under in-plane bending (IPB) and out-of-plane bending (OPB) loading conditions. Through a detailed Finite Element Analysis… Advisors/Committee Members: Fotouhi, Reza, Boulfiza, Mohamed, Oguocha, Ikechukwuka, Szyszkowski, Walerian, Bugg, James, Varvani-Farahani, Ahmad.

Subjects/Keywords: T-joints; Stress analysis; Fatigue; Strain Gauges; Finite Elements

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APA (6^th Edition):

Moazed, R. (2010). Strength of welded thin-walled square hollow section T-joint connections by FE simulations and experiments. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/etd-06282010-182509

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Moazed, Reza. “Strength of welded thin-walled square hollow section T-joint connections by FE simulations and experiments.” 2010. Thesis, University of Saskatchewan. Accessed October 19, 2019. http://hdl.handle.net/10388/etd-06282010-182509.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Moazed, Reza. “Strength of welded thin-walled square hollow section T-joint connections by FE simulations and experiments.” 2010. Web. 19 Oct 2019.

Vancouver:

Moazed R. Strength of welded thin-walled square hollow section T-joint connections by FE simulations and experiments. [Internet] [Thesis]. University of Saskatchewan; 2010. [cited 2019 Oct 19]. Available from: http://hdl.handle.net/10388/etd-06282010-182509.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Moazed R. Strength of welded thin-walled square hollow section T-joint connections by FE simulations and experiments. [Thesis]. University of Saskatchewan; 2010. Available from: http://hdl.handle.net/10388/etd-06282010-182509

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Saskatchewan

15. Oladimeji, Dotun J 1989-. Thermal Conductivity of Nuclear Fuel and its Degradation by Physical and Chemical Burnup.

Degree: 2017, University of Saskatchewan

URL: http://hdl.handle.net/10388/8024

► Nuclear fuel performance during reactor operation has been studied using both atomic scale simulation and experimental procedure in order to investigate how nuclear fission process… (more)

▼ Nuclear fuel performance during reactor operation has been studied using both atomic scale simulation and experimental procedure in order to investigate how nuclear fission process affects both the physical state and the chemistry of the fuel. Attention has been drawn to the consequences of nuclear exposure after Fukushima nuclear accident, as it relates to the impact of modern reactor design and nuclear fuel performance. With the recognition of the inherent risks associated with pure uranium oxide (UO2) fuel reactors, there is a need to study nuclear fuel with a view to highlighting their susceptibility to reactor accident, hence, developing an accident tolerant fuel. In this work, cerium oxide (CeO2) has been deployed as a surrogate material for UO2 fuel due to their uniquely similar physicochemical behaviors as fuel materials during operations of nuclear reactors. CeO2 is, however, non-radioactive. The nuclear reactor safety analysis revealed that thermal conductivity is an important property of nuclear fuel because it controls fuel operating temperature and therefore influences its safety. In line with this assertion, two key areas of focus have been identified in this investigation: i) degradation of thermal conductivity by structural and fission products in nuclear fuel and ii) the fuel microstructural evolution due to dissolved fission product. The former has been carried out using molecular dynamics (MD) simulations and analytical models over the full range of temperature of interest while the latter was carried out using both experimental procedure and MD simulations. MD simulations of the structural and thermal properties of CeO2 as a representative of UO2 fuel were carried out using Large-scale Atomic/Molecular Massively Parallel Simulator (LAMMPS) code. The thermal expansion, thermal conductivity, and oxygen ion diffusion were calculated using classical ionic potential models. During these processes, verification of methods was done to establish the best potential for CeO2. The many-body ionic potential in the Embedded Atom Method (EAM) and two-body force field potentials were used to predict lattice parameters and thermal conductivity. Nuclear fuel efficiency changes during reactor operation because of irradiation process. Fission products like fission gas bubble, pores, cracks, dissolved and precipitated fission product buildup in the fuel matrix. The effect of physical burnup such as porosity on the thermophysical properties of CeO2 was simulated using a large system with thousands of atoms. Pores were induced on the large CeO2 system by carefully removing an appropriate number of atoms in proper proportion to mimic porosity evolution. Lattice parameter and the thermal conductivity were calculated at a different percentage of porosity for CeO2. This calculation relates the degradation of thermal conductivity with a number of pores and increasing temperature. In irradiated oxide fuels (UO2 and PuO2), several fission products (FP) are produced and they take various chemical states depending on the… Advisors/Committee Members: Szpunar, Jerzy, Szpunar, Barbara, Powel, Rob, Koustov, Alexandre, Ghezelbash, Masoud, Boulfiza, Mohamed.

Subjects/Keywords: Nuclear Fuel; Molecular Dynamics; Thermal conductivity

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APA (6^th Edition):

Oladimeji, D. J. 1. (2017). Thermal Conductivity of Nuclear Fuel and its Degradation by Physical and Chemical Burnup. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/8024

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Oladimeji, Dotun J 1989-. “Thermal Conductivity of Nuclear Fuel and its Degradation by Physical and Chemical Burnup.” 2017. Thesis, University of Saskatchewan. Accessed October 19, 2019. http://hdl.handle.net/10388/8024.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Oladimeji, Dotun J 1989-. “Thermal Conductivity of Nuclear Fuel and its Degradation by Physical and Chemical Burnup.” 2017. Web. 19 Oct 2019.

Vancouver:

Oladimeji DJ1. Thermal Conductivity of Nuclear Fuel and its Degradation by Physical and Chemical Burnup. [Internet] [Thesis]. University of Saskatchewan; 2017. [cited 2019 Oct 19]. Available from: http://hdl.handle.net/10388/8024.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Oladimeji DJ1. Thermal Conductivity of Nuclear Fuel and its Degradation by Physical and Chemical Burnup. [Thesis]. University of Saskatchewan; 2017. Available from: http://hdl.handle.net/10388/8024

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Saskatchewan

16. Bergerman, Martin. Design of free flowing granular drains for groundwater containment applications.

Degree: 2011, University of Saskatchewan

URL: http://hdl.handle.net/10388/etd-01102011-192840

► Many geoenvironmental applications make use of granular drainage layers. Design guidelines for these drains recommend a granular soil that provides for filtration of the adjacent… (more)

▼ Many geoenvironmental applications make use of granular drainage layers. Design guidelines for these drains recommend a granular soil that provides for filtration of the adjacent base soil. Filtration criteria have been developed through laboratory studies in which fine soils under a concentrated gradient of water are protected from erosion by a filter soil. The primary objective in these studies has been the geotechnical stability of earth-fill structures, while drainage was a secondary consideration. Granular drainage layers have therefore been constructed using fine sand. The subsequent migration of fine soil into these drains has resulted in significant loss in permeability. The main research objective was to develop design criteria for granular drains to be used for long term operation in environmental applications. The secondary objective was to investigate the relationships between grain size distribution of drain materials and clogging by fines. This was done through a laboratory study where changes in permeability were measured in granular soils infiltrated with fines. Lastly, the effect of salinity on fines deposition was also investigated. The hypothesis of the current study is that coarser granular drains minimize the impact of clogging and provides a better alternative to traditional drain designs for long term environmental applications. The laboratory study was performed with three granular drainage soils: a French Drain sand designed using the traditional filter design method, a coarser uniform sand, and a coarser graded sand with approximately 40% gravel sized particles. Three fine soils were used to infiltrate the drainage soils; however, their particle size distributions were not significantly different from one another. The results indicate that the permeability of all three drainage soils could be reduced by approximately one order of magnitude with continuous flow of a high concentration of fines (5 g/L). The permeabilities of the sands were reduced to a lesser extent with a lower concentration of fines. Permeabilities of the graded soils decreased more slowly with a lower concentration of fines, when considering pore volumes of flow. However, the rate of permeability decrease was ultimately influenced by the amount of fines delivered to the sample. A lower concentration of fines did not significantly slow the rate of permeability reduction in the uniform sand. All three sands retained a similar mass of fines (samples were split and fines content measured following each test). Salinity in the pore water did not significantly affect deposition, likely due to the fact that the fines contained a small amount of clay sized particles. When considering that all three drainage soils became clogged with fines during the tests, the coarse soils maintained a relatively high permeability due to the fact that their pre-test permeabilities were high. This information, along with the results from the literature review, has led to the development of recommended new design criteria for… Advisors/Committee Members: Haug, Moir D., Boulfiza, Mohamed, Sharma, Jitendrapal S., Barbour, S. L., Fonstad, Terrance A..

Subjects/Keywords: fines deposition; filter permeability; groundwater containment; granular drain; soil drain; granular filter; soil filter; base soil

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APA (6^th Edition):

Bergerman, M. (2011). Design of free flowing granular drains for groundwater containment applications. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/etd-01102011-192840

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Bergerman, Martin. “Design of free flowing granular drains for groundwater containment applications.” 2011. Thesis, University of Saskatchewan. Accessed October 19, 2019. http://hdl.handle.net/10388/etd-01102011-192840.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Bergerman, Martin. “Design of free flowing granular drains for groundwater containment applications.” 2011. Web. 19 Oct 2019.

Vancouver:

Bergerman M. Design of free flowing granular drains for groundwater containment applications. [Internet] [Thesis]. University of Saskatchewan; 2011. [cited 2019 Oct 19]. Available from: http://hdl.handle.net/10388/etd-01102011-192840.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Bergerman M. Design of free flowing granular drains for groundwater containment applications. [Thesis]. University of Saskatchewan; 2011. Available from: http://hdl.handle.net/10388/etd-01102011-192840

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Saskatchewan

17. MacLeod, Alison Barbara. Structural health monitoring of the Traffic Bridge in Saskatoon using strain gauges.

Degree: 2010, University of Saskatchewan

URL: http://hdl.handle.net/10388/etd-04122011-161104

► The steel through-truss Traffic Bridge, located in Saskatoon, Saskatchewan is over one hundred years old. The bridge has been subject to ongoing maintenance throughout its… (more)

▼ The steel through-truss Traffic Bridge, located in Saskatoon, Saskatchewan is over one hundred years old. The bridge has been subject to ongoing maintenance throughout its service life. However, inspection reports from 2005 and 2006 highlighted the severe deterioration experienced primarily by the steel members immediately above and below the deck surface. These reports prompted the City of Saskatoon (COS) to implement a rehabilitation project that involved the installation of a post-tensioning system to relieve the badly corroded bottom chord members of the axial loads due to the self-weight of the structure, in 2006. Due to the severe deterioration and the structural modifications that the Traffic Bridge has endured, a limited scope structural health monitoring (SHM) system, based on strain measurements, was implemented to reduce some of the uncertainty regarding the active load paths occurring at the deck level. The objectives of the SHM study were to obtain more information regarding the actual load paths and ascertain possible types of structural redundancy, to determine how to best model this type of structure, and to find ways to track ongoing deterioration using instrumentation. The SHM study involved controlled truck loading scenarios to permit measurement of the load paths and provide data to compare the measured results to a finite element (FE) model of the instrumented span. In addition, random loading scenarios were used to capture the vertical dynamic response of the structure in order to further refine the FE model. This study focused on the response of one-half of one interior span. A total of 72 strain gauges were installed. The downstream truss was highly instrumented at ten locations, three members of the upstream truss were instrumented to measure the distribution, and the floor joists in the downstream lane were instrumented to establish possible redundancy paths. Using an FE model in combination with the measured strain data, it was found that redundant load paths only existed at the level of the deck. The bottom chord members experienced non-zero strains once the control vehicle was past the span, possibly indicating some level of redundancy. The members believed to relieve a portion of the bottom chord tensile forces included the car joists, edge joists, and the timber deck. The amount of force transferred from the bottom chord to the deck members was found by FE analysis to be highly related to the lateral stiffness of the floor beams. The FE model was adjusted to match the measured results by modifying various modelling parameters. The most important features of the model were that all deck elements were modelled to be located at the elevation of the bottom chord, that the lateral stiffness of the floor beams was reduced by 50% to best represent the transfer of forces to deck elements, and that the stiffness of bottom chord members was reduced to 80% of their pristine values. In combination with calibrated modification factors applied to the measured values, this FE model is believed to be a… Advisors/Committee Members: Wegner, Leon, Sparling, Bruce, Sparks, Gordon, Afseth, Jeff, Boulfiza, Mohamed, Feldman, Lisa.

Subjects/Keywords: Saskatoon; structural health monitoring; strain gauges; Traffic Bridge; truss; steel; bridge; instrumentation; SHM; finite element model

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

MacLeod, A. B. (2010). Structural health monitoring of the Traffic Bridge in Saskatoon using strain gauges. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/etd-04122011-161104

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

MacLeod, Alison Barbara. “Structural health monitoring of the Traffic Bridge in Saskatoon using strain gauges.” 2010. Thesis, University of Saskatchewan. Accessed October 19, 2019. http://hdl.handle.net/10388/etd-04122011-161104.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

MacLeod, Alison Barbara. “Structural health monitoring of the Traffic Bridge in Saskatoon using strain gauges.” 2010. Web. 19 Oct 2019.

Vancouver:

MacLeod AB. Structural health monitoring of the Traffic Bridge in Saskatoon using strain gauges. [Internet] [Thesis]. University of Saskatchewan; 2010. [cited 2019 Oct 19]. Available from: http://hdl.handle.net/10388/etd-04122011-161104.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

MacLeod AB. Structural health monitoring of the Traffic Bridge in Saskatoon using strain gauges. [Thesis]. University of Saskatchewan; 2010. Available from: http://hdl.handle.net/10388/etd-04122011-161104

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Saskatchewan

18. Elsamahy, Mohamed Salah Kamel. Impacts of midpoint FACTS controllers on the coordiantion between generator phase backup protection and generator capability limits.

Degree: 2011, University of Saskatchewan

URL: http://hdl.handle.net/10388/etd-07102011-162129

► The thesis reports the results of comprehensive studies carried out to explore the impact of midpoint FACTS Controllers (STATCOM and SVC) on the generator distance… (more)

▼ The thesis reports the results of comprehensive studies carried out to explore the impact of midpoint FACTS Controllers (STATCOM and SVC) on the generator distance phase backup protection in order to identify important issues that protection engineers need to consider when designing and setting a generator protection system. In addition, practical, feasible and simple solutions to mitigate the adverse impact of midpoint FACTS Controllers on the generator distance phase backup protection are explored. The results of these studies show that midpoint FACTS Controllers have an adverse effect on the generator distance phase backup protection. This adverse effect, which can be in the form of underreach, overreach or a time delay, varies according to the fault type, fault location and generator loading. Moreover, it has been found that the adverse effect of the midpoint FACTS Controllers extends to affect the coordination between the generator distance phase backup protection and the generator steady-state overexcited capability limit. The Support Vector Machines classification technique is proposed as a replacement for the existing generator distance phase backup protection relay in order to alleviate potential problems. It has been demonstrated that this technique is a very promising solution, as it is fast, reliable and has a high performance efficiency. This will result in enhancing the coordination between the generator phase backup protection and the generator steady-state overexcited capability limit in the presence of midpoint FACTS Controllers. The thesis also presents the results of investigations carried out to explore the impact of the generator distance phase backup protection relay on the generator overexcitation thermal capability. The results of these investigations reveal that with the relay settings according to the current standards, the generator is over-protected and the generator distance phase backup protection relay restricts the generator overexcitation thermal capability during system disturbances. This restriction does not allow the supply of the maximum reactive power of the generating unit during such events. The restriction on the generator overexcitation thermal capability caused by the generator distance phase backup protection relay highlights the necessity to revise the relay settings. The proposed solution in this thesis is to reduce the generator distance phase backup protection relay reach in order to provide secure performance during system disturbances. Advisors/Committee Members: Faried, Sherif O., Nguyen, Ha, Chowdhury, Nurul, El-Serafi, Ahmed M., Boulfiza, Mohamed, Liao, Yuan.

Subjects/Keywords: generator capability limits; midpoint FACTS controllers; generator overexcitation limiters; support vector machines; generator phase backup protection

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Elsamahy, M. S. K. (2011). Impacts of midpoint FACTS controllers on the coordiantion between generator phase backup protection and generator capability limits. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/etd-07102011-162129

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Elsamahy, Mohamed Salah Kamel. “Impacts of midpoint FACTS controllers on the coordiantion between generator phase backup protection and generator capability limits.” 2011. Thesis, University of Saskatchewan. Accessed October 19, 2019. http://hdl.handle.net/10388/etd-07102011-162129.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Elsamahy, Mohamed Salah Kamel. “Impacts of midpoint FACTS controllers on the coordiantion between generator phase backup protection and generator capability limits.” 2011. Web. 19 Oct 2019.

Vancouver:

Elsamahy MSK. Impacts of midpoint FACTS controllers on the coordiantion between generator phase backup protection and generator capability limits. [Internet] [Thesis]. University of Saskatchewan; 2011. [cited 2019 Oct 19]. Available from: http://hdl.handle.net/10388/etd-07102011-162129.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Elsamahy MSK. Impacts of midpoint FACTS controllers on the coordiantion between generator phase backup protection and generator capability limits. [Thesis]. University of Saskatchewan; 2011. Available from: http://hdl.handle.net/10388/etd-07102011-162129

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Saskatchewan

19. MacLeod, Alison Barbara. Structural health monitoring the Traffic Bridge in Saskatoon using strain gauges.

Degree: 2010, University of Saskatchewan

URL: http://hdl.handle.net/10388/etd-04112011-204209

► The steel through-truss Traffic Bridge, located in Saskatoon, Saskatchewan is over one hundred years old. The bridge has been subject to ongoing maintenance throughout its… (more)

▼ The steel through-truss Traffic Bridge, located in Saskatoon, Saskatchewan is over one hundred years old. The bridge has been subject to ongoing maintenance throughout its service life. However, inspection reports from 2005 and 2006 highlighted the severe deterioration experienced primarily by the steel members immediately above and below the deck surface. These reports prompted the City of Saskatoon (COS) to implement a rehabilitation project that involved the installation of a post-tensioning system to relieve the badly corroded bottom chord members of the axial loads due to the self-weight of the structure, in 2006. Due to the severe deterioration and the structural modifications that the Traffic Bridge has endured, a limited scope structural health monitoring (SHM) system, based on strain measurements, was implemented to reduce some of the uncertainty regarding the active load paths occurring at the deck level. The objectives of the SHM study were to obtain more information regarding the actual load paths and ascertain possible types of structural redundancy, to determine how to best model this type of structure, and to find ways to track ongoing deterioration using instrumentation. The SHM study involved controlled truck loading scenarios to permit measurement of the load paths and provide data to compare the measured results to a finite element (FE) model of the instrumented span. In addition, random loading scenarios were used to capture the vertical dynamic response of the structure in order to further refine the FE model. This study focused on the response of one-half of one interior span. A total of 72 strain gauges were installed. The downstream truss was highly instrumented at ten locations, three members of the upstream truss were instrumented to measure the distribution, and the floor joists in the downstream lane were instrumented to establish possible redundancy paths. Using an FE model in combination with the measured strain data, it was found that redundant load paths only existed at the level of the deck. The bottom chord members experienced non-zero strains once the control vehicle was past the span, possibly indicating some level of redundancy. The members believed to relieve a portion of the bottom chord tensile forces included the car joists, edge joists, and the timber deck. The amount of force transferred from the bottom chord to the deck members was found by FE analysis to be highly related to the lateral stiffness of the floor beams. The FE model was adjusted to match the measured results by modifying various modelling parameters. The most important features of the model were that all deck elements were modelled to be located at the elevation of the bottom chord, that the lateral stiffness of the floor beams was reduced by 50% to best represent the transfer of forces to deck elements, and that the stiffness of bottom chord members was reduced to 80% of their pristine values. In combination with calibrated modification factors applied to the measured values, this FE model is believed to… Advisors/Committee Members: Sparling, Bruce, Wegner, Leon, Feldman, Lisa, Boulfiza, Mohamed, Sparks, Gordon, Afseth, Jeff.

Subjects/Keywords: SHM; instrumentation; structural health monitoring; strain gauges; Saskatoon; Traffic Bridge; steel; truss; bridge; finite element modeling; FEM

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

MacLeod, A. B. (2010). Structural health monitoring the Traffic Bridge in Saskatoon using strain gauges. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/etd-04112011-204209

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

MacLeod, Alison Barbara. “Structural health monitoring the Traffic Bridge in Saskatoon using strain gauges.” 2010. Thesis, University of Saskatchewan. Accessed October 19, 2019. http://hdl.handle.net/10388/etd-04112011-204209.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

MacLeod, Alison Barbara. “Structural health monitoring the Traffic Bridge in Saskatoon using strain gauges.” 2010. Web. 19 Oct 2019.

Vancouver:

MacLeod AB. Structural health monitoring the Traffic Bridge in Saskatoon using strain gauges. [Internet] [Thesis]. University of Saskatchewan; 2010. [cited 2019 Oct 19]. Available from: http://hdl.handle.net/10388/etd-04112011-204209.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

MacLeod AB. Structural health monitoring the Traffic Bridge in Saskatoon using strain gauges. [Thesis]. University of Saskatchewan; 2010. Available from: http://hdl.handle.net/10388/etd-04112011-204209

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Saskatchewan

20. Vogel, Timothy 1991-. Assessing Design and Funding Methods of Water Infrastructure for Saskatchewan First Nations.

Degree: 2019, University of Saskatchewan

URL: http://hdl.handle.net/10388/11772

► Many water systems on First Nations in Saskatchewan are at risk of not being able to consistently meet water quality guidelines, which negatively impacts human… (more)

▼ Many water systems on First Nations in Saskatchewan are at risk of not being able to consistently meet water quality guidelines, which negatively impacts human health. It was the goal of my thesis to assess design and funding methods for water infrastructure projects on First Nations. It was important that this research was informed by community values and priorities gained from discussions with Elders, interviews with water treatment officers, and activities with elementary and high school students. A scoping review looked for existing literature on water infrastructure projects that involved the community in the design process, termed ‘co-design’. Of 1,551 articles searched, only 13 were found using the search terms (and synonyms): “water”, “co-design”, “Indigenous communities”, “infrastructure”, and “Canada”. A common definition of co-design and clear process is required to trend towards community informed design. Co-design as a process for water infrastructure in Indigenous communities encompasses the cultural, traditional, and spiritual values associated with water from the community’s worldview along with the environmental and technical conditions from an engineering standpoint. The increased involvement for this process requires extra funding, which is difficult in communities that are already restricted by rigid funding frameworks. Communities prefer a centralized system (piped water) to reduce the likelihood of contamination and water quantity rationing. The preference for a centralized system is prevented by a funding formula that does not provide the higher capital expense of this infrastructure. However, the formula can be expanded beyond capital investment and regular operation and maintenance to include costs associated with human health. The installation of both decentralized and centralized systems were quoted and compared for an example community of 100 homes (500 people). The approximate capital cost of a centralized system and decentralized system were found to be 3,512,000 and 1,365,000, respectively. However, the extra costs associated with the decentralized system were 570,000 per year, which covers the greater capital investment for a centralized system in under 5 years. The provision of safe drinking water for human health justifies a greater capital investment on its own, but the inclusion of other variables in the funding formula suggests that it is economically feasible as well. Advisors/Committee Members: McPhedran, Kerry, Fonstad, Terry, Bharadwaj, Lalita, Peng, Jian, Boulfiza, Mohamed, Belcher, Ken.

Subjects/Keywords: Drinking water; First Nations

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Vogel, T. 1. (2019). Assessing Design and Funding Methods of Water Infrastructure for Saskatchewan First Nations. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/11772

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Vogel, Timothy 1991-. “Assessing Design and Funding Methods of Water Infrastructure for Saskatchewan First Nations.” 2019. Thesis, University of Saskatchewan. Accessed October 19, 2019. http://hdl.handle.net/10388/11772.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Vogel, Timothy 1991-. “Assessing Design and Funding Methods of Water Infrastructure for Saskatchewan First Nations.” 2019. Web. 19 Oct 2019.

Vancouver:

Vogel T1. Assessing Design and Funding Methods of Water Infrastructure for Saskatchewan First Nations. [Internet] [Thesis]. University of Saskatchewan; 2019. [cited 2019 Oct 19]. Available from: http://hdl.handle.net/10388/11772.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Vogel T1. Assessing Design and Funding Methods of Water Infrastructure for Saskatchewan First Nations. [Thesis]. University of Saskatchewan; 2019. Available from: http://hdl.handle.net/10388/11772

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Saskatchewan

21. Tiamiyu, Ahmed Alade 1987-. Dynamic impact response and corrosion behavior of coarse- and ultrafine-grained AISI 321 austenitic stainless steel.

Degree: 2019, University of Saskatchewan

URL: http://hdl.handle.net/10388/12269

► The excellent corrosion-resistance of metastable AISI 321 austenitic stainless steel makes it a choice material in the fabrication of nuclear and chemical plants, pressure vessels,… (more)

▼ The excellent corrosion-resistance of metastable AISI 321 austenitic stainless steel makes it a choice material in the fabrication of nuclear and chemical plants, pressure vessels, automobile and aircraft components, etc. However, AISI 321 is characterized by low-yield strength and poor tribological properties that hinder its widespread application. Therefore, it is important to improve its yield-strength to expand its structural applications without compromising its excellent corrosion resistance. In this study, the effect of grain refinement via cryo-rolling followed by annealing on the strength and corrosion resistance of AISI 321 austenitic stainless steel is investigated. The mechanical behavior of the as-received coarse-grain and refined alloy (fine-grain and ultrafine-grain) were investigated at high (dynamic impact) and low (quasi-static compression) strain rates using the split Hopkinson pressure bar and Instron R5500 mechanical testing machine, respectively. The corrosion resistance of coarse-grained (CG), fine-grained (FG), and ultrafine-grained (UFG) specimens were also investigated using electrochemical methods. Scanning and transmission electron microscopy (SEM, TEM), X-ray diffraction (XRD), and electron-backscattered diffraction (EBSD) were used for the microstructural and textural characterization of various specimens of the alloy before and after plastic deformation. The optimum thermomechanical process conditions for developing UFG structure in the AISI 321 steel is cryo-rolling to 50 % reduction of plate thickness followed by process annealing at 1023 K (750 ℃) for 600 s (10 minutes). The hardness of the UFG steel specimens is determined to be ~195 % higher than that of the as-received (CG) AISI 321 steel. The developed UFG specimens have strong intensity of ζ-fibre ({110}<uvw>) texture, which is attributed to pseudo-texture memory effect in AISI 321 steel. The mechanism for pseudo-texture memory in AISI 321 steel is proposed. The yield strength of the UFG AISI 321 steel is ~400 and ~200% higher than those of the CG specimens under both quasi-static and dynamic deformation conditions, respectively. Slip and twinning are the active deformation mechanisms in CG specimens. Both are highly suppressed in the UFG specimens due to spatial restriction effect. During plastic deformation, γ-FCC to martensite (αʹ-BCC) phase transformation occurred, which is more favored in the UFG specimens and at low strain rates. The co-existence of martensitic phase transformation paths with and without an intermediate phase (HCP ɛ-martensite) is confirmed in AISI 321 steel during plastic deformation under both quasi-static and dynamic loading conditions. Irrespective of grain size, Shoji-Nishiyama, Kurdjumov-Sachs and Burgers orientation relationships exist between the γ and ɛ, γ and αʹ, and ɛ and αʹ phases, respectively. Thus, the phase transformation sequence follows both FCC γ → BCC αʹ and FCC γ → HCP ɛ → BCC αʹ path. The stable end-orientation of the austenite phase in compression is [110]||CD texture while that of… Advisors/Committee Members: Odeshi, Akindele G., Szpunar, Jerzy A, Guo, Huiqing, Oguocha, Ikechukwuka, Yang, Qiaoqin, Boulfiza, Mohamed.

Subjects/Keywords: AISI 321 austenitic stainless steel; Thermomechanical processing; Ultrafine-grained structure; Slip; Twinning; Phase transformation; Split Hopkinson pressure bar; Dynamic shock loading; Quasi-static compression; Adiabatic shear band; Corrosion; Transmission electron microscope; Electron backscattered diffraction; Texture; Texture memory; Strain rate sensitivity; Activation volume

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Tiamiyu, A. A. 1. (2019). Dynamic impact response and corrosion behavior of coarse- and ultrafine-grained AISI 321 austenitic stainless steel. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/12269

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Tiamiyu, Ahmed Alade 1987-. “Dynamic impact response and corrosion behavior of coarse- and ultrafine-grained AISI 321 austenitic stainless steel.” 2019. Thesis, University of Saskatchewan. Accessed October 19, 2019. http://hdl.handle.net/10388/12269.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Tiamiyu, Ahmed Alade 1987-. “Dynamic impact response and corrosion behavior of coarse- and ultrafine-grained AISI 321 austenitic stainless steel.” 2019. Web. 19 Oct 2019.

Vancouver:

Tiamiyu AA1. Dynamic impact response and corrosion behavior of coarse- and ultrafine-grained AISI 321 austenitic stainless steel. [Internet] [Thesis]. University of Saskatchewan; 2019. [cited 2019 Oct 19]. Available from: http://hdl.handle.net/10388/12269.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Tiamiyu AA1. Dynamic impact response and corrosion behavior of coarse- and ultrafine-grained AISI 321 austenitic stainless steel. [Thesis]. University of Saskatchewan; 2019. Available from: http://hdl.handle.net/10388/12269

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Saskatchewan

22. Pham, Tung. Power Allocation in Wireless Relay Networks.

Degree: 2011, University of Saskatchewan

URL: http://hdl.handle.net/10388/ETD-2011-08-65

► This thesis is mainly concerned with power allocation issues in wireless relay networks where a single or multiple relays assist transmission from a single or… (more)

▼ This thesis is mainly concerned with power allocation issues in wireless relay networks where a single or multiple relays assist transmission from a single or multiple sources to a destination. First, a network model with a single source and multiple relays is considered, in which both cases of orthogonal and non – orthogonal relaying are investigated. For the case of orthogonal relaying, two power allocation schemes corresponding to two partial channel state information (CSI) assumptions are proposed. Given the lack of full and perfect CSI, appropriate signal processing at the relays and/or destination is also developed. The performance behavior of the system with power allocation between the source and the relays is also analyzed. For the case of non-orthogonal relaying, it is demonstrated that optimal power allocation is not sufficiently effective. Instead, a relay beamforming scheme is proposed. A comprehensive comparison between the orthogonal relaying with power allocation scheme and the non-orthogonal relaying with beamforming scheme is then carried out, which reveals several interesting conclusions with respect to both error performance and system throughput. In the second part of the thesis, a network model with multiple sources and a single relay is considered. The transmission model is applicable for uplink channels in cellular mobile systems in which multiple mobile terminals communicate with the base station with the help of a single relay station. Single-carrier frequency division multiple access (SC-FDMA) technique with frequency domain equalization is adopted in order to avoid the amplification of the multiple access interference at the relay. Minimizing the transmit power at the relay and optimizing the fairness among the sources in terms of throughput are the two objectives considered in implementing power allocation schemes. The problems are visualized as water-filling and water-discharging models and two optimal power allocation schemes are proposed, accordingly. Finally, the last part of the thesis is extended to a network model with multiple sources and multiple relays. The orthogonal multiple access technique is employed in order to avoid multiple access interference. Proposed is a joint optimal beamforming and power allocation scheme in which an alternative optimization technique is applied to deal with the non-convexity of the power allocation problem. Furthermore, recognizing the high complexity and large overhead information exchange when the number of sources and relays increases, a relay selection scheme is proposed. Since each source is supported by at most one relay, the feedback information from the destination to each relay can be significantly reduced. Using an equal power allocation scheme, relay selection is still an NP-hard combinatorial optimization problem. Nevertheless, the proposed sub-optimal scheme yields a comparable performance with a much lower computational complexity and can be well suited for practical systems. Advisors/Committee Members: Nguyen, Ha H., Dinh, Anh V., Daku, Brian L., Saadat-Mehr, Aryan S., Boulfiza, Mohamed, Schober, Robert.

Subjects/Keywords: Wireless relay networks; power allocation; signal processing; optimization.

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Pham, T. (2011). Power Allocation in Wireless Relay Networks. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/ETD-2011-08-65

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Pham, Tung. “Power Allocation in Wireless Relay Networks.” 2011. Thesis, University of Saskatchewan. Accessed October 19, 2019. http://hdl.handle.net/10388/ETD-2011-08-65.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Pham, Tung. “Power Allocation in Wireless Relay Networks.” 2011. Web. 19 Oct 2019.

Vancouver:

Pham T. Power Allocation in Wireless Relay Networks. [Internet] [Thesis]. University of Saskatchewan; 2011. [cited 2019 Oct 19]. Available from: http://hdl.handle.net/10388/ETD-2011-08-65.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Pham T. Power Allocation in Wireless Relay Networks. [Thesis]. University of Saskatchewan; 2011. Available from: http://hdl.handle.net/10388/ETD-2011-08-65

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Saskatchewan

23. Wang, Yufeng. VIBRATION-BASED DAMAGE DETECTION ON A MULTI-GIRDER BRIDGE SUPERSTRUCTURE.

Degree: 2011, University of Saskatchewan

URL: http://hdl.handle.net/10388/ETD-2011-09-192

► Vibration-based damage detection (VBDD) techniques have been proposed as a potential form of structural health monitoring with which an entire structure can be evaluated simultaneously… (more)

▼ Vibration-based damage detection (VBDD) techniques have been proposed as a potential form of structural health monitoring with which an entire structure can be evaluated simultaneously using relatively few sensors. Since these methods rely on the identification of small changes in dynamic properties (notably natural frequencies and mode shapes) to infer the existence and the location of damage, reliable estimates of these properties are essential for the successful implementation of VBDD schemes. The research described in this thesis was primarily focused on an experimental investigation of the application of VBDD on a multi-girder bridge superstructure, with the objectives of identifying the most reliable test procedures, developing VBDD techniques that could be used for identifying the presence of damage, and evaluating the performance of VBDD techniques for such structures. The experimental investigation was supplemented by theoretical analyses and numerical verifications. The structure used for this investigation was a one-third scale model of a slab-on-girder composite bridge superstructure featuring four steel girders supporting a steel-free concrete deck, based on the North Perimeter Red River Bridge in Winnipeg, Manitoba. The experimental tests were conducted in a well-controlled laboratory environment. Forced dynamic excitation was supplied by means of a feedback-controlled hydraulic shaker. Instrumentation used to measure the dynamic response included a closely-spaced grid of accelerometers mounted on the surface of the deck along the girder lines, as well as electrical-resistance foil strain gauges bonded to the girder webs. Damage cases investigated included damage to the steel girders, to the diaphragm members, to the lateral steel straps, and to the concrete deck. A damage detection indicator was developed based on mode shapes that had been normalized to enclose an area of unity. The resulting area under the plot of the difference between two independently measured mode shapes was then used as the damage indicator. To demonstrate the features and verify the capability of the newly developed damage indicator in the absence of experimental uncertainties, a finite element model of the bridge superstructure was developed and used to generate theoretical data for the modal properties. A database of pairs of independently measured mode shapes, in which both mode shapes in the pair were obtained with the structure in an identical condition, was used to ascertain the variability of the area of mode shape change indicator when different test procedures were followed. This allowed the definition of threshold values of the damage indicator for each set of test procedures, corresponding to the 90th or 95th percentile of the probability distribution of the damage indicator. When the damage indicator exceeds this value, the presence of damage can be inferred with a high level of confidence. A total of 28 different test protocols were investigated, which included two different excitation methods… Advisors/Committee Members: Sparling, Bruce F., Wegner, Leon D., Proulx, Jean, Boulfiza, Mohamed, Feldman, Lisa, Dolovich, Allan T., Mazurek, Kerry A..

Subjects/Keywords: Steel-free bridge deck; Multi-girder bridge superstructure; Vibration testing; Structural health monitoring; Vibration-based damage detection

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Wang, Y. (2011). VIBRATION-BASED DAMAGE DETECTION ON A MULTI-GIRDER BRIDGE SUPERSTRUCTURE. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/ETD-2011-09-192

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Wang, Yufeng. “VIBRATION-BASED DAMAGE DETECTION ON A MULTI-GIRDER BRIDGE SUPERSTRUCTURE.” 2011. Thesis, University of Saskatchewan. Accessed October 19, 2019. http://hdl.handle.net/10388/ETD-2011-09-192.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Wang, Yufeng. “VIBRATION-BASED DAMAGE DETECTION ON A MULTI-GIRDER BRIDGE SUPERSTRUCTURE.” 2011. Web. 19 Oct 2019.

Vancouver:

Wang Y. VIBRATION-BASED DAMAGE DETECTION ON A MULTI-GIRDER BRIDGE SUPERSTRUCTURE. [Internet] [Thesis]. University of Saskatchewan; 2011. [cited 2019 Oct 19]. Available from: http://hdl.handle.net/10388/ETD-2011-09-192.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Wang Y. VIBRATION-BASED DAMAGE DETECTION ON A MULTI-GIRDER BRIDGE SUPERSTRUCTURE. [Thesis]. University of Saskatchewan; 2011. Available from: http://hdl.handle.net/10388/ETD-2011-09-192

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Saskatchewan

24. Nie, Xiaodong Rachel. Heat and moisture migration within a porous urea particle bed.

Degree: 2010, University of Saskatchewan

URL: http://hdl.handle.net/10388/etd-05072010-140128

► Urea is an important nitrogen fertilizer for plant nutrition, but is very susceptible to moisture sorption and caking even at low moisture contents, e.g. 0.25%… (more)

▼ Urea is an important nitrogen fertilizer for plant nutrition, but is very susceptible to moisture sorption and caking even at low moisture contents, e.g. 0.25% w/w. When urea particles adsorb moisture followed by drying, crystal bridges form between urea particles. For particles in a bed, this process is called caking. Cakes in stored urea cause a degradation of its quality and value. Investigations of the moisture absorption in beds of manufactured urea particles and adsorption on the external and internal surfaces of urea particles are a necessary step if engineers are to recommend procedures to reduce caking and control inventories. Research on moisture adsorption and cake strength of urea fertilizer has not been sufficiently explored. Only recently have researchers started to devise tests to investigate the crystal bonding between two urea particles. Prior to this research, investigations of the moisture interactions in beds of urea were nearly non-existent. This thesis presents experimental, theoretical and numerical methods to investigate the coupled heat and moisture transfer processes in a bed of urea particles while the bed is exposed to ambient air with changing temperature and humidity. Urea particles are nearly spherical with uniform particle size distribution. The particle size, its internal pore structure and rough crystalline external surface depend on the manufacturing process. In this thesis, two types of urea products are investigated, i.e. prill Georgia urea and granular Terico urea. The rough external surface and internal pore structure of each particle makes the total surface area exposed to water much larger than similar smooth and solid spherical particles. Although Georgia urea has higher external surface area than Terico urea, the latter type has larger total surface area and internal pore volume. For both Terico urea and Georgia, the internal surface area dominates the water sorption process but the external moisture sorption of Georgia urea is more important than that of Terico urea. All the water vapor interaction experiments were carried out with air flow through a test bed because it shortens the duration of each experiment to a few hours in most cases. A series of experiments with step changes in inlet air temperature and humidity for air flow through a urea bed indicated that the measured outlet air temperature and humidity responses, each at a specific air flow rate, reveals a typical exponential or transient time change that can be characterized by a time constant. After formulating the theoretical problem for step changes in the inlet properties, the analytical solutions showed that the time constants of outlet response to whether a temperature step change or a humidity step change are functions of the convection coefficient and air velocity. The predicted outlet air temperature is determined by only one time constant for a temperature step change while it is determined by these two time constants for a humidity step change. A new test cell with sampling test ports was developed… Advisors/Committee Members: Evitts, Richard W., Besant, Robert W., Zhu, Jesse, Boulfiza, Mohamed, Oguocha, Ikechukwuka N., Tabil, Lope G., Torvi, David A., Simonson, Carey J..

Subjects/Keywords: Moisture soprtion and desorption; Coupled computational domains; Rough surface; Porous particle; Internal diffusion; Urea fertilizer

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Nie, X. R. (2010). Heat and moisture migration within a porous urea particle bed. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/etd-05072010-140128

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Nie, Xiaodong Rachel. “Heat and moisture migration within a porous urea particle bed.” 2010. Thesis, University of Saskatchewan. Accessed October 19, 2019. http://hdl.handle.net/10388/etd-05072010-140128.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Nie, Xiaodong Rachel. “Heat and moisture migration within a porous urea particle bed.” 2010. Web. 19 Oct 2019.

Vancouver:

Nie XR. Heat and moisture migration within a porous urea particle bed. [Internet] [Thesis]. University of Saskatchewan; 2010. [cited 2019 Oct 19]. Available from: http://hdl.handle.net/10388/etd-05072010-140128.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Nie XR. Heat and moisture migration within a porous urea particle bed. [Thesis]. University of Saskatchewan; 2010. Available from: http://hdl.handle.net/10388/etd-05072010-140128

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Saskatchewan

25. Saha, Ouafi 1971-. Cold weather admixture systems for cement-based materials applied to masonry mortar binder.

Degree: 2019, University of Saskatchewan

URL: http://hdl.handle.net/10388/12384

► Masonry construction in cold weather is a challenge due to the slow or non-existent hydration reaction of the cementitious material at low and subfreezing temperatures.… (more)

▼ Masonry construction in cold weather is a challenge due to the slow or non-existent hydration reaction of the cementitious material at low and subfreezing temperatures. The construction industry’s need for an alternative to providing thermal protection has motivated the exploration of using antifreeze admixtures. The main objectives of this project were to develop and evaluate an effective antifreeze admixture for masonry mortars from available products, and to identify the active components responsible for promoting the strength gain and the mechanisms by which they act. In the first stage of the experimental program, an incomplete response surface design approach was used to develop an antifreeze admixture. The approach consisted of combining a total of six off-the-shelf concrete admixtures, up to five at a time at three dosage levels each. The target optimization function of the system was the minimization of the freezing point of the mortar, which was measured using an embedded thermocouple in the center of the mortar cylinders. Several combinations of admixtures were effective at lowering the freezing point of the mortar mix; however, the compressive strength was found not to be systematically correlated to the freezing temperature. The compressive strengths of mortar samples prepared with the best candidates, when cured at 10°C and 15°C, reached acceptable levels. However, a pre-curing (heat protection) period of between 6 and 12 hours was necessary for the mortar to reach these strength levels. The best performing candidate from the previous stage was selected to undergo further investigation to identify the active compound and to study its effect on the hydration process. Elemental and mineral characterization of the admixture, using mainly X-ray fluorescence (XRF) and X-ray diffraction (XRD), revealed a high concentration of sodium nitrite with some mullite, in addition to an unidentified amorphous phase. The characterization of the hydration products did not reveal any uncommon phases, suggesting the presence of a certain amount of unfrozen water in the pore structure that allowed the hydration reaction to proceed and the C S H phase to develop. The suspected active ingredient (sodium nitrite) was tested as a stand-alone admixture to confirm its action as an antifreeze agent, and produced masonry mortar with an acceptable 28-day compressive strength when cured at 10°C. No pre-curing period was required in this phase of testing. The dosage of sodium nitrite was also optimized and found to be approximately 5% by cement weight to maximize the strength gain. Given that no hard evidence of any unusual ongoing chemical reactions was found using the characterization techniques, the physical action of the antifreeze was investigated. The working hypothesis was that a certain amount of liquid water was present at subfreezing temperatures, which allowed the hydration reaction to proceed. As an indirect way of confirming the hypothesis, the non-destructive time domain reflectometry (TDR) technique was used to… Advisors/Committee Members: Boulfiza, Mohamed, Wegner, Leon D, Hawkes, Christopher D, Sparling, Bruce F, Feldman, Lisa R, Oguocha, Ike K.

Subjects/Keywords: Masonry mortar; Antifreeze admixtures; Freezing point depression; Cold weather protection; Cement hydration; Cementitious materials characterization; Tracking water content; Time domain reflectometry

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Saha, O. 1. (2019). Cold weather admixture systems for cement-based materials applied to masonry mortar binder. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/12384

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Saha, Ouafi 1971-. “Cold weather admixture systems for cement-based materials applied to masonry mortar binder.” 2019. Thesis, University of Saskatchewan. Accessed October 19, 2019. http://hdl.handle.net/10388/12384.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Saha, Ouafi 1971-. “Cold weather admixture systems for cement-based materials applied to masonry mortar binder.” 2019. Web. 19 Oct 2019.

Vancouver:

Saha O1. Cold weather admixture systems for cement-based materials applied to masonry mortar binder. [Internet] [Thesis]. University of Saskatchewan; 2019. [cited 2019 Oct 19]. Available from: http://hdl.handle.net/10388/12384.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Saha O1. Cold weather admixture systems for cement-based materials applied to masonry mortar binder. [Thesis]. University of Saskatchewan; 2019. Available from: http://hdl.handle.net/10388/12384

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

26. Ramadani, Thamer. Effect of Silica Fume on Moisture Flow and the Advective-Dispersive Transport of Ionic Species in Unsaturated Concrete.

Degree: 2013, University of Saskatchewan

URL: http://hdl.handle.net/10388/ETD-2013-04-977

► Under unsaturated conditions, both moisture flow and the transport of ions strongly depend on the degree of saturation in concrete. In the current literature, most… (more)

▼ Under unsaturated conditions, both moisture flow and the transport of ions strongly depend on the degree of saturation in concrete. In the current literature, most theories and empirical models describe moisture flow and the transport of ions in concrete based on the assumption that concrete is fully submerged in a liquid phase. This simplistic assumption often leads to a systematic underestimation in the amount of ions, such as chlorides, especially in the case of concrete applications subjected to cyclic wetting and drying conditions. In this study, an experimental program was established to determine the key hydraulic parameters needed for modeling the moisture flow and the transport of ions in five types of concrete mixes under unsaturated conditions. The required hydraulic parameters of the five concrete mixes include the saturated hydraulic permeability, the moisture retention function, and the dependency of the relative diffusion coefficient on degree of saturation. A centrifuge technique was used to determine the saturated hydraulic permeability of the five concrete mixes. The moisture retention data of all concrete mixes were determined using a vapour equilibrium technique. The moisture retention data were then used to determine the van Genuchten empirical parameters for an analytical characterization of the capillary pressure-degree of water saturation and the relative permeability-degree of saturation relationships. The dependency of the relative diffusion coefficient on the degree of water saturation was characterized for each type of concrete mix indirectly using an electrical resistivity technique. The experimental results of this study were used in different empirical models that have been originally developed for soils to examine whether they could be applied for concrete The five concrete mixes used in this study were characterized by the usage of a different proportion of dry densified silica fume in each concrete mix. Those mixes were used to determine the effect of silica fume on the experimental and the empirical key hydraulic parameters considered in this study. Advisors/Committee Members: Boulfiza, Mohamed, Wegner, Leon D., Oguocha, Ikechukwuka N..

Subjects/Keywords: Silica fume; Unsaturtaed

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APA (6^th Edition):

Ramadani, T. (2013). Effect of Silica Fume on Moisture Flow and the Advective-Dispersive Transport of Ionic Species in Unsaturated Concrete. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/ETD-2013-04-977

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Ramadani, Thamer. “Effect of Silica Fume on Moisture Flow and the Advective-Dispersive Transport of Ionic Species in Unsaturated Concrete.” 2013. Thesis, University of Saskatchewan. Accessed October 19, 2019. http://hdl.handle.net/10388/ETD-2013-04-977.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Ramadani, Thamer. “Effect of Silica Fume on Moisture Flow and the Advective-Dispersive Transport of Ionic Species in Unsaturated Concrete.” 2013. Web. 19 Oct 2019.

Vancouver:

Ramadani T. Effect of Silica Fume on Moisture Flow and the Advective-Dispersive Transport of Ionic Species in Unsaturated Concrete. [Internet] [Thesis]. University of Saskatchewan; 2013. [cited 2019 Oct 19]. Available from: http://hdl.handle.net/10388/ETD-2013-04-977.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Ramadani T. Effect of Silica Fume on Moisture Flow and the Advective-Dispersive Transport of Ionic Species in Unsaturated Concrete. [Thesis]. University of Saskatchewan; 2013. Available from: http://hdl.handle.net/10388/ETD-2013-04-977

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

27. Cheng, Wubin. Development of A Kinetic Model For Loop-Free Colonoscopy Technology.

Degree: 2013, University of Saskatchewan

URL: http://hdl.handle.net/10388/ETD-2013-09-1060

► The colonoscope is an important tool in diagnosis and management of diseases of the colon. One of the ongoing challenges with this device is that… (more)

▼ The colonoscope is an important tool in diagnosis and management of diseases of the colon. One of the ongoing challenges with this device is that the colonoscope may form a loop together with the colon during the procedure. The result of the loop is that further insertion of the scope in the colon may not be possible. The loop may also cause risks of perforation of the colon and pain in the patient. There are currently several existing devices to overcome loop formation in colonoscopy, some of which have been introduced in clinical work. However, empirical assessment shows that these devices do not work very well. This is the motivation for the research presented in this thesis. In this thesis, a new paradigm of thinking, “doctor-assisted colonoscopy,” is proposed to overcome loop formation. In this new approach, the physician’s role is enhanced with new information that is acquired by sensors outside the human body and inferred from the mathematical model. It is referred to as a kinetic model due to the fact that this model describes the kinetic behaviour of the scope. This thesis is devoted to development of this kinetic model. In this study, the model of the colonoscope and the model of the colon are developed based on the Timoshenko beam theory, and parameters in both models are determined by the experiments. The following conclusions then are made: (1) self-locking of the colonoscope is the most basic cause for a loop to occur, while structural instability of the colonsocope is dependent on the self-locking; (2) both the scope and the colon can be well represented with the Timoshenko beam elements and the Linear Complementary Problem (LCP) formulation derived from Signorini’s law, and Coulom’s law for representation of interactions between the colon and scope is adequate; (3) there are effects from the location, looping, and tip deflection of the scope on flexural rigidity of the scope. Approximately, the flexural rigidity of the CF-Q160L colonoscope ranges from 300 to 650 N•cm2, and its accuracy is proven by a good agreement between the model predicted result and experimental result; (4) Rayleigh damping for the CF-Q160L colonoscope depends more on the mass matrix [M] of the colonoscope than the stiffness matrix [K], which is evident by the large coefficient value of “alpha” (0.3864) and the small coefficient value of “beta” (0.0164). The contributions of this thesis are: (1) the finding that the main cause of the loop is not structural instability of the colonoscope but rather self-locking of the colonoscope, which could lead to design of a “new-generation” colonoscope to avoid the loop; (2) a systematic evaluation of the existing colonoscopy technologies based on the well-proven Axiomatic Design Theory (ADT), which will serve as a guideline for the development of future new colonoscopes in future; (3) an approach to developing a kinetic model of the colonoscope useful to modeling similar objects such as a catheter guide-wire; (4) a novel ex-vivo colonoscopy test-bed with the kinetic and kinematic… Advisors/Committee Members: Zhang, Wenjun, Johnston, James, Wu, Fangxiang, Boulfiza, Mohamed, Moser, Michael.

Subjects/Keywords: analysis; colonoscope; colon; loop formation; modeling

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APA (6^th Edition):

Cheng, W. (2013). Development of A Kinetic Model For Loop-Free Colonoscopy Technology. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/ETD-2013-09-1060

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Cheng, Wubin. “Development of A Kinetic Model For Loop-Free Colonoscopy Technology.” 2013. Thesis, University of Saskatchewan. Accessed October 19, 2019. http://hdl.handle.net/10388/ETD-2013-09-1060.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Cheng, Wubin. “Development of A Kinetic Model For Loop-Free Colonoscopy Technology.” 2013. Web. 19 Oct 2019.

Vancouver:

Cheng W. Development of A Kinetic Model For Loop-Free Colonoscopy Technology. [Internet] [Thesis]. University of Saskatchewan; 2013. [cited 2019 Oct 19]. Available from: http://hdl.handle.net/10388/ETD-2013-09-1060.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Cheng W. Development of A Kinetic Model For Loop-Free Colonoscopy Technology. [Thesis]. University of Saskatchewan; 2013. Available from: http://hdl.handle.net/10388/ETD-2013-09-1060

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

28. Sanchez Contreras, Denise. The Effect of Splice Length and Distance between Lapped Reinforcing Bars in Concrete Block Specimens.

Degree: 2014, University of Saskatchewan

URL: http://hdl.handle.net/10388/ETD-2014-04-1529

► The tensile resistance of No. 15 lap spliced reinforcing bars with varying transverse spacing and lap splice length was evaluated in full-scale concrete block wall… (more)

▼ The tensile resistance of No. 15 lap spliced reinforcing bars with varying transverse spacing and lap splice length was evaluated in full-scale concrete block wall splice specimens. The range of the transverse spacing between bars was limited to that which allowed the bars to remain within the same cell, and included the evaluation of tied spliced bars in contact. Two-and-a-half block wide by three course tall double pullout specimens reinforced with contact lap splices were initially used to determine the range of lap splice length values to be tested in the wall splice specimens such that bond failure of the reinforcement occurred. The double pullout specimens were tested in direct tension with six replicates per arrangement. Three values of lap splice length: 150, 200, and 250 mm, were selected from the testing of the double pullout specimens and tested in the wall splice specimens in combination with three values of transverse spacing: 0, 25, and 50 mm, with three replicates per configuration. A total of twenty-seven two-and-a-half block wide by thirteen course tall wall splice specimens reinforced with two lap splices were tested in four-point loading. Both the double pullout and the wall splice specimens were constructed in running bond with all cells fully grouted. The tensile resistance of the lap spliced bars in the double pullout specimens was measured directly. The contact lap splices with a 150, 200, and 250 mm lap splice length developed approximately 38, 35 and 29% of the theoretical yield load of the reinforcement, respectively. The difference between the mean tensile resistances of the three reinforcement configurations tested in the double pullout specimens was found to be statistically significant at the 95% confidence level. Different than expected, the tensile resistance of the lap spliced reinforcing bars in the double pullout specimens was inversely proportional to the lap splice length provided. For the short lap splice lengths used in this investigation, the linear but not proportional relationship between bond force and lap splice length known from reinforced concrete is believed to have caused this phenomenon. An iterative sectional analysis using moment-curvature response was used to calculate the tensile resistance of the lap spliced reinforcement in the wall splice specimens. The calculated mean tensile resistance of the reinforcement increased with increasing lap splice length, and was greater when the bars were in contact. Securing the bars in contact may have influenced the tensile capacity of the contact lap splices as higher stresses are likely to develop as a result of the bar ribs riding over each other with increasing slip. Results of the data analysis suggest that the tensile resistance of non-contact lap splices within the same cell is generally independent of the spacing between the bars. A comparison of the experimental results for the wall splice specimens with the development and splice length provisions in CSA S304.1-04 and TMS 402-11 indicate that both the Canadian and… Advisors/Committee Members: Feldman, Lisa R., Sparling, Bruce F., Boulfiza, Mohamed.

Subjects/Keywords: Concrete block masonry; Double pullout specimens, Wall splice specimens; Lap splices; Transverse bar spacing; Non-contact lap splices; Bond and development

…masonry construction. Recent research performed at the University of Saskatchewan included an… …previous research performed at the University of Saskatchewan (Ahmed and Feldman, 2012)…

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APA (6^th Edition):

Sanchez Contreras, D. (2014). The Effect of Splice Length and Distance between Lapped Reinforcing Bars in Concrete Block Specimens. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/ETD-2014-04-1529

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Sanchez Contreras, Denise. “The Effect of Splice Length and Distance between Lapped Reinforcing Bars in Concrete Block Specimens.” 2014. Thesis, University of Saskatchewan. Accessed October 19, 2019. http://hdl.handle.net/10388/ETD-2014-04-1529.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Sanchez Contreras, Denise. “The Effect of Splice Length and Distance between Lapped Reinforcing Bars in Concrete Block Specimens.” 2014. Web. 19 Oct 2019.

Vancouver:

Sanchez Contreras D. The Effect of Splice Length and Distance between Lapped Reinforcing Bars in Concrete Block Specimens. [Internet] [Thesis]. University of Saskatchewan; 2014. [cited 2019 Oct 19]. Available from: http://hdl.handle.net/10388/ETD-2014-04-1529.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Sanchez Contreras D. The Effect of Splice Length and Distance between Lapped Reinforcing Bars in Concrete Block Specimens. [Thesis]. University of Saskatchewan; 2014. Available from: http://hdl.handle.net/10388/ETD-2014-04-1529

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

29. Tolouei Asbforoushani, Maryam. Corrosion of Carbon Steel Under Disbonded Coatings in Acidified Leaching Processes.

Degree: 2015, University of Saskatchewan

URL: http://hdl.handle.net/10388/ETD-2015-05-2060

► In this research, corrosion behaviour of A36 carbon steel under engineered disbonded coating was investigated in sulphuric acid solutions containing sodium chloride and iron (III)… (more)

▼ In this research, corrosion behaviour of A36 carbon steel under engineered disbonded coating was investigated in sulphuric acid solutions containing sodium chloride and iron (III) sulphate. Scanning electron microscopy (SEM) and x-ray diffraction (XRD) analyses were carried out to study the morphology and phase composition of corrosion products formed on the carbon steel surface. The results of the SEM analysis showed that only general and pitting corrosion occurred on the carbon steel surface with the engineered crevice. The size of the pits increased as the sulphuric acid and sodium chloride concentrations increased. Moreover, the corrosion products had an open, irregular and loose structure at the pits mouth. The loose and open structure of the corrosion products facilitates diffusion of chloride ions, oxygen, water and contaminants into the carbon steel surface. In contrast, the corrosion products had a very compact and continuous structure outside the pits which provided a good protection against further corrosion. The x-ray diffraction analysis showed that the corrosion products layer mainly consisted of lepidocrocite (γ-FeOOH), goethite (α-FeOOH) and iron sulphide (FeS) on the crevice edges. The Pourbaix diagram of iron in sulphuric acid solution at room temperature indicates that iron sulphide is formed on the metal surface at different pH values. The akaganeite (β-FeOOH) diffraction peak was not identified in any spectrum which could be due to the low concentration of chloride ions in the solutions. Furthermore, the number of lepidocrocite peaks decreased as the sulphuric acid concentration increased from 10 g l-1 to 50 g l-1. The lepidocrocite is dissolved in the presence of sulphuric acid, and the dissolved ion acts as an oxidant to the metal and hence lower lepidocrocite peaks are identified. Electrochemical noise measurement (ECN) testing was also performed to investigate the corrosion process occurring on the carbon steel surface with the engineered crevice. The results of the ECN measurements showed that current increased during first few minutes and then decreased slightly. Also, the coupled potential did not change after an initial shift in negative direction. The low current flowing through the carbon steel electrodes and the constant potential showed that the crevice corrosion did not develop. These results imply that the crevice corrosion may not occur on the carbon steel surface in acidic solutions containing chloride ions. Advisors/Committee Members: Evitts, Richard, Heppner, Kevin, Odeshi, Akindele, Meda, Venkatesh, Boulfiza, Mohamed.

Subjects/Keywords: Corrosion; Carbon Steel; Scanning Electron Microscopy; X-ray Diffraction; Electrochemical Noise Measurement

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APA (6^th Edition):

Tolouei Asbforoushani, M. (2015). Corrosion of Carbon Steel Under Disbonded Coatings in Acidified Leaching Processes. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/ETD-2015-05-2060

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Tolouei Asbforoushani, Maryam. “Corrosion of Carbon Steel Under Disbonded Coatings in Acidified Leaching Processes.” 2015. Thesis, University of Saskatchewan. Accessed October 19, 2019. http://hdl.handle.net/10388/ETD-2015-05-2060.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Tolouei Asbforoushani, Maryam. “Corrosion of Carbon Steel Under Disbonded Coatings in Acidified Leaching Processes.” 2015. Web. 19 Oct 2019.

Vancouver:

Tolouei Asbforoushani M. Corrosion of Carbon Steel Under Disbonded Coatings in Acidified Leaching Processes. [Internet] [Thesis]. University of Saskatchewan; 2015. [cited 2019 Oct 19]. Available from: http://hdl.handle.net/10388/ETD-2015-05-2060.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Tolouei Asbforoushani M. Corrosion of Carbon Steel Under Disbonded Coatings in Acidified Leaching Processes. [Thesis]. University of Saskatchewan; 2015. Available from: http://hdl.handle.net/10388/ETD-2015-05-2060

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

30. Udey, Alexander. Realistic Wind Loads on Unreinforced Masonry Walls.

Degree: 2014, University of Saskatchewan

URL: http://hdl.handle.net/10388/ETD-2014-08-1668

► Twenty full-scale unreinforced masonry walls were constructed and tested to failure in the Structures Laboratory at the University of Saskatchewan. The focus of the testing… (more)

▼ Twenty full-scale unreinforced masonry walls were constructed and tested to failure in the Structures Laboratory at the University of Saskatchewan. The focus of the testing related to two primary objectives. The first objective was to study the effects that the support conditions of the walls had on their behaviour. The masonry wall specimens tested spanned vertically under the application of out-of-plane loads. Ten of the full scale walls were tested with support conditions that modeled ideal pinned connections at the top and bottom of the wall, while the remaining half of the walls were tested with nominally “pinned” supports that were similar to the supports typically encountered in practice. The second objective was to determine the effects that dynamic loads had on the behaviour of the walls. Half of the masonry specimens for each group of support conditions were loaded laterally with monotonically increasing quasi-static loads representative of the effects of uniform wind pressure, while the remaining specimens were loaded laterally with dynamic time histories that varied randomly in a manner that was representative of real “gusty” winds. The research was therefore done to determine the influence of load and connection type on the behavior of the masonry walls. When comparing the effects of the support conditions, it was found that the walls constructed with realistic support conditions were able to resist larger out-of-plane loads, with greater ductility than the walls that had ideally-pinned supports. Specifically, the realistically-pinned walls required an average moment (of both the statically and dynamically loaded walls) that was 63% larger to cause mid-height cracking than the average mid-height moment required to cause mid-height cracking in the ideally-pinned walls. After mid-height cracking occurred, the realistically-pinned walls exhibited reserve capacity, resulting in additional strength, such that the ultimate moment capacity of the realistically-pinned walls was 140% greater than the ultimate strength of the ideally-pinned walls, where the ultimate strength was the capacity of the wall at mid-height cracking. As a result, the ductility of the realistically-pinned walls was also significantly larger than that of the ideally-pinned walls. Specifically, the ductility ratio of the realistically-pinned walls was 70 (where the ductility ratio is defined as the displacement at the ultimate load divided by the displacement at mid-height cracking), while the ductility ratio of the ideally-pinned walls was unity (the ultimate load coincided with formation of the mid-height crack). The results of the dynamically and quasi-statically loaded walls were harder to evaluate. In comparing the ideally-pinned walls it was found that the specimens that were loaded dynamically had an average moment capacity that was approximately 10% larger than the walls that were loaded quasi-statically, which was found to be statistically significant at the 90% level. However, the results from the realistically-pinned walls… Advisors/Committee Members: Sparling, Bruce F., Boulfiza, Mohamed, Feldman, Lisa, Fleming, Ian, Hoeppner, Colin.

Subjects/Keywords: Unreinforced masonry; Realistic Wind

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Udey, A. (2014). Realistic Wind Loads on Unreinforced Masonry Walls. (Thesis). University of Saskatchewan. Retrieved from http://hdl.handle.net/10388/ETD-2014-08-1668

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Udey, Alexander. “Realistic Wind Loads on Unreinforced Masonry Walls.” 2014. Thesis, University of Saskatchewan. Accessed October 19, 2019. http://hdl.handle.net/10388/ETD-2014-08-1668.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Udey, Alexander. “Realistic Wind Loads on Unreinforced Masonry Walls.” 2014. Web. 19 Oct 2019.

Vancouver:

Udey A. Realistic Wind Loads on Unreinforced Masonry Walls. [Internet] [Thesis]. University of Saskatchewan; 2014. [cited 2019 Oct 19]. Available from: http://hdl.handle.net/10388/ETD-2014-08-1668.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Udey A. Realistic Wind Loads on Unreinforced Masonry Walls. [Thesis]. University of Saskatchewan; 2014. Available from: http://hdl.handle.net/10388/ETD-2014-08-1668

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

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