subject:(viscoelasticity)

Oregon State University

1. Jenkins, Christopher H. M. Transient nonlinear deformations of viscoelastic membranes.

Degree: PhD, Mechanical Engineering, 1991, Oregon State University

URL: http://hdl.handle.net/1957/20302

Subjects/Keywords: Viscoelasticity

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Jenkins, C. H. M. (1991). Transient nonlinear deformations of viscoelastic membranes. (Doctoral Dissertation). Oregon State University. Retrieved from http://hdl.handle.net/1957/20302

Chicago Manual of Style (16^th Edition):

Jenkins, Christopher H M. “Transient nonlinear deformations of viscoelastic membranes.” 1991. Doctoral Dissertation, Oregon State University. Accessed October 18, 2019. http://hdl.handle.net/1957/20302.

MLA Handbook (7^th Edition):

Jenkins, Christopher H M. “Transient nonlinear deformations of viscoelastic membranes.” 1991. Web. 18 Oct 2019.

Vancouver:

Jenkins CHM. Transient nonlinear deformations of viscoelastic membranes. [Internet] [Doctoral dissertation]. Oregon State University; 1991. [cited 2019 Oct 18]. Available from: http://hdl.handle.net/1957/20302.

Council of Science Editors:

Jenkins CHM. Transient nonlinear deformations of viscoelastic membranes. [Doctoral Dissertation]. Oregon State University; 1991. Available from: http://hdl.handle.net/1957/20302

McGill University

2. Jackson, Christopher Eugene. Inertial effects in the line loading of a visco-elastic half space.

Degree: M. Eng., Department of Mechanical Engineering, 1972, McGill University

URL: http://digitool.library.mcgill.ca/thesisfile50245.pdf

Subjects/Keywords: Viscoelasticity

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Jackson, C. E. (1972). Inertial effects in the line loading of a visco-elastic half space. (Masters Thesis). McGill University. Retrieved from http://digitool.library.mcgill.ca/thesisfile50245.pdf

Chicago Manual of Style (16^th Edition):

Jackson, Christopher Eugene. “Inertial effects in the line loading of a visco-elastic half space.” 1972. Masters Thesis, McGill University. Accessed October 18, 2019. http://digitool.library.mcgill.ca/thesisfile50245.pdf.

MLA Handbook (7^th Edition):

Jackson, Christopher Eugene. “Inertial effects in the line loading of a visco-elastic half space.” 1972. Web. 18 Oct 2019.

Vancouver:

Jackson CE. Inertial effects in the line loading of a visco-elastic half space. [Internet] [Masters thesis]. McGill University; 1972. [cited 2019 Oct 18]. Available from: http://digitool.library.mcgill.ca/thesisfile50245.pdf.

Council of Science Editors:

Jackson CE. Inertial effects in the line loading of a visco-elastic half space. [Masters Thesis]. McGill University; 1972. Available from: http://digitool.library.mcgill.ca/thesisfile50245.pdf

Michigan State University

3. DeLeeuw, Samuel Leonard. Behavior of viscoelastic plates under the action of in-plane forces.

Degree: PhD, 1961, Michigan State University

URL: http://etd.lib.msu.edu/islandora/object/etd:17760

Subjects/Keywords: Viscoelasticity

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

DeLeeuw, S. L. (1961). Behavior of viscoelastic plates under the action of in-plane forces. (Doctoral Dissertation). Michigan State University. Retrieved from http://etd.lib.msu.edu/islandora/object/etd:17760

Chicago Manual of Style (16^th Edition):

DeLeeuw, Samuel Leonard. “Behavior of viscoelastic plates under the action of in-plane forces.” 1961. Doctoral Dissertation, Michigan State University. Accessed October 18, 2019. http://etd.lib.msu.edu/islandora/object/etd:17760.

MLA Handbook (7^th Edition):

DeLeeuw, Samuel Leonard. “Behavior of viscoelastic plates under the action of in-plane forces.” 1961. Web. 18 Oct 2019.

Vancouver:

DeLeeuw SL. Behavior of viscoelastic plates under the action of in-plane forces. [Internet] [Doctoral dissertation]. Michigan State University; 1961. [cited 2019 Oct 18]. Available from: http://etd.lib.msu.edu/islandora/object/etd:17760.

Council of Science Editors:

DeLeeuw SL. Behavior of viscoelastic plates under the action of in-plane forces. [Doctoral Dissertation]. Michigan State University; 1961. Available from: http://etd.lib.msu.edu/islandora/object/etd:17760

Michigan State University

4. Marvin, Eugene Lawrence, 1935-. Quasi-static deformation of a viscoelastic plate supported on a porous elastic fluid-filled half-space.

Degree: PhD, Department of Metallurgy, Mechanics, and Materials Science, 1971, Michigan State University

URL: http://etd.lib.msu.edu/islandora/object/etd:35417

Subjects/Keywords: Viscoelasticity

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Marvin, Eugene Lawrence, 1. (1971). Quasi-static deformation of a viscoelastic plate supported on a porous elastic fluid-filled half-space. (Doctoral Dissertation). Michigan State University. Retrieved from http://etd.lib.msu.edu/islandora/object/etd:35417

Chicago Manual of Style (16^th Edition):

Marvin, Eugene Lawrence, 1935-. “Quasi-static deformation of a viscoelastic plate supported on a porous elastic fluid-filled half-space.” 1971. Doctoral Dissertation, Michigan State University. Accessed October 18, 2019. http://etd.lib.msu.edu/islandora/object/etd:35417.

MLA Handbook (7^th Edition):

Marvin, Eugene Lawrence, 1935-. “Quasi-static deformation of a viscoelastic plate supported on a porous elastic fluid-filled half-space.” 1971. Web. 18 Oct 2019.

Vancouver:

Marvin, Eugene Lawrence 1. Quasi-static deformation of a viscoelastic plate supported on a porous elastic fluid-filled half-space. [Internet] [Doctoral dissertation]. Michigan State University; 1971. [cited 2019 Oct 18]. Available from: http://etd.lib.msu.edu/islandora/object/etd:35417.

Council of Science Editors:

Marvin, Eugene Lawrence 1. Quasi-static deformation of a viscoelastic plate supported on a porous elastic fluid-filled half-space. [Doctoral Dissertation]. Michigan State University; 1971. Available from: http://etd.lib.msu.edu/islandora/object/etd:35417

University of Melbourne

5. MOHD YUSOF, NOR SAADAH. Ultrasonic modification of micelle structures.

Degree: 2015, University of Melbourne

URL: http://hdl.handle.net/11343/54635

► The tremendous attention given to micelle systems is due to its potential uses in many scientific, biomedical and industrial applications. Micellar aggregations possess unique ability… (more)

▼ The tremendous attention given to micelle systems is due to its potential uses in many scientific, biomedical and industrial applications. Micellar aggregations possess unique ability to exhibit different physicochemical properties owing to their dynamic and reversible structural transformation. This flexibility is controllable by different stimuli. In this study, the possibility of designing a variety of micelle nanostructures using ultrasound is investigated. Using ultrasound as a stimulus is an advantage as it eliminates the needs of adding external chemicals to the micellar system, and experimental parameters could be easily controlled. The fundamental properties of micelles and various forces generated by ultrasound in liquids are discussed in Chapter 1. The second chapter on Literature Review is structured in line with Results and Discussion chapters. In the first section, the use of a fluorescence based technique for the determination of critical micelle concentration as well as reported attempts in monitoring micelle structural changes are outlined. In the second section, literature dealing with structural changes in micelle systems by different stimuli is reviewed. The Reptation Reaction Model is discussed in detail in the following section. This section provides theoretical arguments on the reptation process of micelle, as well as the different reaction (recombination) routes that result in the formation of different structures of micelle. In the last section, sonochemical synthesis of gold nanoparticles is reviewed. In Chapter 3, materials used, solution preparation methods, experimental approaches and analytical methods used are described. The micelle used in this study is cetyltrimethylammonium salicylate (CTASal) prepared by an ion exchange process between cetyltrimethylammonium bromide (CTAB) and sodium salicylate (NaSal). The ultrasonic settings chosen include different sonication reactors, frequency and applied power. In Chapter 4, a fluorescence based technique using fluorescein isothiocyanate (FITC) as a probe to monitor structural changes in micelle was successfully implemented. The method was found to be successful in detecting the critical micelle concentration (cmc) as well as for monitoring the concentration dependent structural growth of CTAB micelle system. It was then tested to the sonicated CTASal micelle system. The limitation of this technique is also discussed in this chapter. In Chapter 5, the first ultrasound-driven transformation of CTASal micelle structures is reported. The wormlike micelle formed from CTAB and NaSal was chosen due to the increasing interest of such viscoelastic micelles in recent technological applications. The sonication was carried out with a plate-type transducer at 211 kHz frequency. The wormlike micelle was found to transform to long threadlike micelle and vesicles/tubular micelle, simultaneously. These were confirmed by the cryo-TEM and rheological measurements. A mechanism for ultrasound induced micelle structural changes is proposed based on…

Subjects/Keywords: ultrasound; micelle; viscoelasticity

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

MOHD YUSOF, N. S. (2015). Ultrasonic modification of micelle structures. (Doctoral Dissertation). University of Melbourne. Retrieved from http://hdl.handle.net/11343/54635

Chicago Manual of Style (16^th Edition):

MOHD YUSOF, NOR SAADAH. “Ultrasonic modification of micelle structures.” 2015. Doctoral Dissertation, University of Melbourne. Accessed October 18, 2019. http://hdl.handle.net/11343/54635.

MLA Handbook (7^th Edition):

MOHD YUSOF, NOR SAADAH. “Ultrasonic modification of micelle structures.” 2015. Web. 18 Oct 2019.

Vancouver:

MOHD YUSOF NS. Ultrasonic modification of micelle structures. [Internet] [Doctoral dissertation]. University of Melbourne; 2015. [cited 2019 Oct 18]. Available from: http://hdl.handle.net/11343/54635.

Council of Science Editors:

MOHD YUSOF NS. Ultrasonic modification of micelle structures. [Doctoral Dissertation]. University of Melbourne; 2015. Available from: http://hdl.handle.net/11343/54635

University of Texas – Austin

6. -8761-3066. The effect of polymer viscoelasticity on residual oil saturation.

Degree: PhD, Petroleum Engineering, 2018, University of Texas – Austin

URL: http://hdl.handle.net/2152/67953

► Water-based polymers are often used to improve oil recovery by increasing sweep efficiency. However, recent laboratory and field work have suggested these polymers, which are… (more)

▼ Water-based polymers are often used to improve oil recovery by increasing sweep efficiency. However, recent laboratory and field work have suggested these polymers, which are often viscoelastic, may also reduce residual oil saturation. The objective of this work is to investigate the effect of viscoelastic polymers on residual oil saturation in sandstones and identify conditions and mechanisms for the improved recovery. Sandstones (Bentheimer and Berea) were saturated with either high viscosity (120cp) or low viscosity oil (10cp) and then waterflooded to residual oil saturation using either brine only or brine followed by an inelastic Newtonian fluid (diluted glycerin). These floods were followed by injection of a viscoelastic polymer, hydrolyzed polyacrylamide (HPAM). To maximize the polymer solutions relaxation time, polymer solutions were often hydrolyzed at a high pH condition (pH>10) and 70°C oven for 3-5 days, and they were neutralized with HCl before injections. Significant reduction in residual oil was observed for all core floods when the polymer had significant elasticity (determined by the dimensionless Deborah number, N [subscript De]). An average residual oil reduction of 11% OOIP was found during HPAM polymer floods for N [subscript De] of 1 to 400. HPAM floods with very low elasticity (N [subscript De] <0.6) did not result in observable reduction in residual oil saturation. Relaxation times of polymers with hydrolysis increased by a factor 2-3 without changing much in polymer viscosity at polymer equivalent shear rate (20-30s⁻¹), and neutralization with HCl does not reduce polymer relaxation time. Capillary numbers from the viscoelastic polymer floods were well controlled, which indicates that viscoelastic polymer can reduce residual oil saturation. Results from CT scans further support these observations. A correlation between Deborah number and normalized residual oil saturation reduction was developed (an Elastic Desaturation Curve, EDC) based on the core flood experiments, and this correlation was successfully implemented into UTCHEM, a chemical flooding reservoir simulator. Viscoelastic models (EDC and relaxation time model) were validated with the core flood results, and they were also applied on a reservoir model based on Oilfield. It was found an additional 3-4%OOIP was recovered from polymer viscoelasticity. Finally, microfluidic experiments were performed with Newtonian fluids and polymers with low and high elasticities to study the fundamental oil recovery mechanisms. It was observed that trapped residual oil can oscillate upstream a constriction when flooded by viscoelastic polymer, but not inelastic fluids. These pore scale observations may partially explain the improved recovery in the core scale experiments. Advisors/Committee Members: Balhoff, Matthew T. (advisor), Pope, Gary A, (committee member), Mohanty, Kishore (committee member), Delshad, Mojdeh (committee member), Johnston, Keith P. (committee member).

Subjects/Keywords: Polymer flooding; Viscoelasticity

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

-8761-3066. (2018). The effect of polymer viscoelasticity on residual oil saturation. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/67953

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

Chicago Manual of Style (16^th Edition):

-8761-3066. “The effect of polymer viscoelasticity on residual oil saturation.” 2018. Doctoral Dissertation, University of Texas – Austin. Accessed October 18, 2019. http://hdl.handle.net/2152/67953.

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

MLA Handbook (7^th Edition):

-8761-3066. “The effect of polymer viscoelasticity on residual oil saturation.” 2018. Web. 18 Oct 2019.

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

Vancouver:

-8761-3066. The effect of polymer viscoelasticity on residual oil saturation. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2018. [cited 2019 Oct 18]. Available from: http://hdl.handle.net/2152/67953.

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

Council of Science Editors:

-8761-3066. The effect of polymer viscoelasticity on residual oil saturation. [Doctoral Dissertation]. University of Texas – Austin; 2018. Available from: http://hdl.handle.net/2152/67953

Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete

The Ohio State University

7. Pandalai, Krishnan Ravi Varman, 1933-. Time dependent behavior of a viscoslastic polymeric material .

Degree: PhD, Graduate School, 1975, The Ohio State University

URL: http://rave.ohiolink.edu/etdc/view?acc_num=osu1486998116226737

Subjects/Keywords: Engineering; Viscoelasticity

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Pandalai, Krishnan Ravi Varman, 1. (1975). Time dependent behavior of a viscoslastic polymeric material . (Doctoral Dissertation). The Ohio State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=osu1486998116226737

Chicago Manual of Style (16^th Edition):

Pandalai, Krishnan Ravi Varman, 1933-. “Time dependent behavior of a viscoslastic polymeric material .” 1975. Doctoral Dissertation, The Ohio State University. Accessed October 18, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1486998116226737.

MLA Handbook (7^th Edition):

Pandalai, Krishnan Ravi Varman, 1933-. “Time dependent behavior of a viscoslastic polymeric material .” 1975. Web. 18 Oct 2019.

Vancouver:

Pandalai, Krishnan Ravi Varman 1. Time dependent behavior of a viscoslastic polymeric material . [Internet] [Doctoral dissertation]. The Ohio State University; 1975. [cited 2019 Oct 18]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1486998116226737.

Council of Science Editors:

Pandalai, Krishnan Ravi Varman 1. Time dependent behavior of a viscoslastic polymeric material . [Doctoral Dissertation]. The Ohio State University; 1975. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1486998116226737

The Ohio State University

8. Chandrangsu, Karoon. A finite element formulation for nonlinear viscoelastic analysis.

Degree: PhD, Graduate School, 1976, The Ohio State University

URL: http://rave.ohiolink.edu/etdc/view?acc_num=osu1487004443403503

Subjects/Keywords: Engineering; Viscoelasticity

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Chandrangsu, K. (1976). A finite element formulation for nonlinear viscoelastic analysis. (Doctoral Dissertation). The Ohio State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=osu1487004443403503

Chicago Manual of Style (16^th Edition):

Chandrangsu, Karoon. “A finite element formulation for nonlinear viscoelastic analysis.” 1976. Doctoral Dissertation, The Ohio State University. Accessed October 18, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487004443403503.

MLA Handbook (7^th Edition):

Chandrangsu, Karoon. “A finite element formulation for nonlinear viscoelastic analysis.” 1976. Web. 18 Oct 2019.

Vancouver:

Chandrangsu K. A finite element formulation for nonlinear viscoelastic analysis. [Internet] [Doctoral dissertation]. The Ohio State University; 1976. [cited 2019 Oct 18]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1487004443403503.

Council of Science Editors:

Chandrangsu K. A finite element formulation for nonlinear viscoelastic analysis. [Doctoral Dissertation]. The Ohio State University; 1976. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1487004443403503

The Ohio State University

9. Jackimiak, Paul Daniel. Time-dependent, non-Newtonian behavior of viscoelastic materials.

Degree: PhD, Graduate School, 1971, The Ohio State University

URL: http://rave.ohiolink.edu/etdc/view?acc_num=osu1486722980193887

Subjects/Keywords: Engineering; Viscoelasticity

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Jackimiak, P. D. (1971). Time-dependent, non-Newtonian behavior of viscoelastic materials. (Doctoral Dissertation). The Ohio State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=osu1486722980193887

Chicago Manual of Style (16^th Edition):

Jackimiak, Paul Daniel. “Time-dependent, non-Newtonian behavior of viscoelastic materials.” 1971. Doctoral Dissertation, The Ohio State University. Accessed October 18, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1486722980193887.

MLA Handbook (7^th Edition):

Jackimiak, Paul Daniel. “Time-dependent, non-Newtonian behavior of viscoelastic materials.” 1971. Web. 18 Oct 2019.

Vancouver:

Jackimiak PD. Time-dependent, non-Newtonian behavior of viscoelastic materials. [Internet] [Doctoral dissertation]. The Ohio State University; 1971. [cited 2019 Oct 18]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1486722980193887.

Council of Science Editors:

Jackimiak PD. Time-dependent, non-Newtonian behavior of viscoelastic materials. [Doctoral Dissertation]. The Ohio State University; 1971. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1486722980193887

University of Pretoria

10. Visagie, Amcois. The effects of physiological concentrations of 17ß-Estradiol and Progesterone on fibrin network ultrastructure.

Degree: MSc, Physiology, 2017, University of Pretoria

URL: http://hdl.handle.net/2263/61676

► 17β-Estradiol (E2) and progesterone (P4) have various important functions but the effect of these endogenous hormone concentrations on fibrin network formation has not been established.… (more)

▼ 17β-Estradiol (E2) and progesterone (P4) have various important functions but the effect of these endogenous hormone concentrations on fibrin network formation has not been established. It is essential to understand natural hormone mechanisms since these hormones are still present in circulation while hormonal contraceptives, which are associated with increased risk of venous thromboembolism, are used. In this study the formation of a fibrin network is analysed when different physiological concentrations of E2 and P4 is added to platelet poor plasma. Blood coagulation is critical for haemostasis but when the formation of a stable clot is influenced in such a way that hypercoagulation takes its course, it can have detrimental effects as it increases the risk of venous thrombosis. During blood coagulation fibrinogen is converted into fibrin in the presence of thrombin. The formation of a dense fibrin clot structure is quite an intense process and packaged in very specific ways. Both E2 and P4 has the ability to shift the haemostatic balance to a hypercoagulable state and therefore viscoelastic studies, morphological analysis as well as turbidimetry were used in this study to observe the possible changes in the fibrin network formation. Viscoelastic studies included thromboelastography (TEG) which gave insight to the properties of clot formation. Morphological studies included scanning electron microscopy (SEM) and atomic force microscopy (AFM) which delivered an investigation in fibrin network morphology, fibrin fiber diameter and surface roughness. Turbidimetry included further analysis of plasma fibrin clot formation and clot lysis time (CLT). Results showed that E2 and P4 showed hypercoagulable viscoelastic properties with decreased fibrin diameter and surface roughness while increased occurrence of dense matted deposits (DMDs) were evident. Turbidimetry showed decreased CLT for E2, but not P4. These results suggest in the presence of endogenous estrogen and progesterone, which is associated with hypercoagulability, the additional burden of synthetic hormones may result in a prothrombotic and hypercoagulable state in females with an inflammatory predisposition. It appears that both E2 and P4, which are known for their anti- and pro-inflammatory action, may influence fibrin network formation on a molecular level. These results are of clinical importance when considering hormones as either a pathological agent or therapeutic intervention. Advisors/Committee Members: Swanepoel, A.C. (advisor), Pretorius, Etheresia (coadvisor).

Subjects/Keywords: UCTD; Thromboembolism; Progesterone; Fibrinogen; Viscoelasticity

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Visagie, A. (2017). The effects of physiological concentrations of 17ß-Estradiol and Progesterone on fibrin network ultrastructure. (Masters Thesis). University of Pretoria. Retrieved from http://hdl.handle.net/2263/61676

Chicago Manual of Style (16^th Edition):

Visagie, Amcois. “The effects of physiological concentrations of 17ß-Estradiol and Progesterone on fibrin network ultrastructure.” 2017. Masters Thesis, University of Pretoria. Accessed October 18, 2019. http://hdl.handle.net/2263/61676.

MLA Handbook (7^th Edition):

Visagie, Amcois. “The effects of physiological concentrations of 17ß-Estradiol and Progesterone on fibrin network ultrastructure.” 2017. Web. 18 Oct 2019.

Vancouver:

Visagie A. The effects of physiological concentrations of 17ß-Estradiol and Progesterone on fibrin network ultrastructure. [Internet] [Masters thesis]. University of Pretoria; 2017. [cited 2019 Oct 18]. Available from: http://hdl.handle.net/2263/61676.

Council of Science Editors:

Visagie A. The effects of physiological concentrations of 17ß-Estradiol and Progesterone on fibrin network ultrastructure. [Masters Thesis]. University of Pretoria; 2017. Available from: http://hdl.handle.net/2263/61676

Hong Kong University of Science and Technology

11. Weerasinghe, Thilina Wijayantha. Plantar-foot surface pressure thresholds and related viscoelastic properties.

Degree: 2015, Hong Kong University of Science and Technology

URL: https://doi.org/10.14711/thesis-b1514446 ; http://repository.ust.hk/ir/bitstream/1783.1-78799/1/th_redirect.html

► The plantar-foot comprises viscoelastic tissue of several different layers. Previous studies have investigated properties such as Pressure Pain Threshold (PPT), Pressure Discomfort Threshold (PDT) and… (more)

▼ The plantar-foot comprises viscoelastic tissue of several different layers. Previous studies have investigated properties such as Pressure Pain Threshold (PPT), Pressure Discomfort Threshold (PDT) and Stiffness of the plantar foot. However, only a handful of studies have evaluated the viscoelastic properties. Even though past studies have recorded the properties of the plantar-foot, it is not possible to compare the results across the studies due to testing location mismatches. In this thesis a generalizable grid was developed for the foot using anatomical landmarks. The grid had 95 points, and each point was tested using an automatic tissue tester with a 0.5 cm² soft edge cylindrical probe at an indentation speed of 1mm/s. Reliability of the grid was tested by measuring and comparing the PPT, PDT and stiffness. Between subjects similarity of the grid was investigated using Morisita’s similarity index. PPT and PDT showed a Morisita’s similarity index value higher than 0.9 in male participants and higher than 0.75 in female participants. Spatial auto correlation was calculated using Moran’s I index. PDT and PPT had Moran's I index values of 0.7. K means clustering was used to developed maps for PPT, PDT and Stiffness over the plantar-foot surface. The perceived feeling of hardness was tested over the plantar-foot surface in another experiment. Three Ethyl Vinyl Acetate (EVA) materials of different hardness were used for the four regions of Heel, Mid-foot, Forefoot, Toes. The heel hardness had a significant (p<0.05) influence on the perceived hardness rating of the other regions. When harder materials were in the heel region, regardless of what materials were in the other regions, participants felt a higher perceived hardness and vice-versa. The viscoelastic properties of the plantar-foot skin were evaluated using F = kX + cX̍. Three indentation speeds (1 mm/s, 3 mm/s and 5 mm/s) were used to determine the mechanical properties of five different locations in the plantar-foot in East Asian and South Asian participants. The model F = kX + cX̍ fits the experimental data with a relatively high coefficient of determination (R² > 0.84) for each subject and each testing location. Both, the testing location and the ethnic groups showed significant effects on the 'k' and the 'c' values. Indentation area dependency on 'k' and 'c' values were evaluated in another experiment with twenty-four South Asian participants using three different indentation areas at five different testing locations in the plantar-foot. The indentation area and the testing location showed significant effects on k' and 'c' values. Plantar-foot skin deformation can be modeled in the form of F = (j (A) + k)) X + (m (A) + n) X̍.; where j, k, m, n are constants at each testing location. The results can be used to develop new designs for footbeds considering gender and ethnic group differences.

Subjects/Keywords: Foot; Pressure; Measurement; Viscoelasticity

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Weerasinghe, T. W. (2015). Plantar-foot surface pressure thresholds and related viscoelastic properties. (Thesis). Hong Kong University of Science and Technology. Retrieved from https://doi.org/10.14711/thesis-b1514446 ; http://repository.ust.hk/ir/bitstream/1783.1-78799/1/th_redirect.html

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):

Weerasinghe, Thilina Wijayantha. “Plantar-foot surface pressure thresholds and related viscoelastic properties.” 2015. Thesis, Hong Kong University of Science and Technology. Accessed October 18, 2019. https://doi.org/10.14711/thesis-b1514446 ; http://repository.ust.hk/ir/bitstream/1783.1-78799/1/th_redirect.html.

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

MLA Handbook (7^th Edition):

Weerasinghe, Thilina Wijayantha. “Plantar-foot surface pressure thresholds and related viscoelastic properties.” 2015. Web. 18 Oct 2019.

Vancouver:

Weerasinghe TW. Plantar-foot surface pressure thresholds and related viscoelastic properties. [Internet] [Thesis]. Hong Kong University of Science and Technology; 2015. [cited 2019 Oct 18]. Available from: https://doi.org/10.14711/thesis-b1514446 ; http://repository.ust.hk/ir/bitstream/1783.1-78799/1/th_redirect.html.

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

Council of Science Editors:

Weerasinghe TW. Plantar-foot surface pressure thresholds and related viscoelastic properties. [Thesis]. Hong Kong University of Science and Technology; 2015. Available from: https://doi.org/10.14711/thesis-b1514446 ; http://repository.ust.hk/ir/bitstream/1783.1-78799/1/th_redirect.html

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

Cornell University

12. Aguilo, Miguel. Inverse Strategies For Characterization Of Material Properties .

Degree: 2011, Cornell University

URL: http://hdl.handle.net/1813/33569

► The imaging of constitutive parameters is of interest in many science and engineering fields. Indeed, non-invasive and nondestructive techniques are used to characterize key properties… (more)

▼ The imaging of constitutive parameters is of interest in many science and engineering fields. Indeed, non-invasive and nondestructive techniques are used to characterize key properties of a system given its response due to an external excitation. Then, assuming a priori a given model of the system, the measured response and an inverse approach are used to identify material properties. This work was undertaken in the context of identification of spatially-varying elastic and viscoelastic parameters of solids using vibroacoustics based techniques. Two optimization approaches, nongradient and gradient-based optimization, were investigated in this work. Initially, nongradient-based algorithms were preferred over gradient-based algorithms because of there ability to find global minima irrespective of initial guesses. For instance, Gaussian radial basis functions were used to construct a finite-dimensional representation of the elastic moduli. Then, an inverse approach was used to approximate the spatiallyvarying elastic moduli through the system response induced by the radiation force of ultrasound. The inverse problem was cast as an optimization problem in which a least-square error functional that quantified the misfit between the experimental and finite element representation system response is minimized by searching over a space of admissible vectors that best describe the spatial distribution of the elastic moduli. Subsequently, gradient-based optimization was preferred over nongradient-based optimization as the number of design variables increased due to the increment in computational cost. Two inverse approaches, L2-adjoint and concept of error in constitutive equation, were investigated in the context of gradient-based optimization. First, the L2-adjoint inverse approach was used to characterize spatially-varying viscoelastic properties because of its advantage to efficiently calculate the gradient of the error functional with respect to the design variables by solving the corresponding adjoint equations. The inverse problem was cast as an optimization problem in which a least-square error functional that quantified the misfit between the experimental and the finite element representation system response is minimized by searching over a space of admissible functions that best describe the spatially-varying viscoelastic properties. Given that the least-square error functional is non-convex, an inverse approach based on the concept of error in constitutive equation was investigated. The convexity property of the error in constitutive equation functionals, shown extensively for elliptic boundary value problems, reduce the sensitivity of the inverse solution to parameter initialization. The inverse problem was cast as an optimization problem in which an error in constitutive equation functional that quantified the misfit between the kinematically and dynamically admissible stress fields is minimized by searching over a space of admissible functions that best describe the spatially-varying viscoelastic properties.… Advisors/Committee Members: Mukherjee, Subrata (committeeMember), Ingraffea, Anthony R (committeeMember), Bonassar, Lawrence (committeeMember).

Subjects/Keywords: viscoelasticity imaging; inverse problem; vibroacoustography

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Aguilo, M. (2011). Inverse Strategies For Characterization Of Material Properties . (Thesis). Cornell University. Retrieved from http://hdl.handle.net/1813/33569

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):

Aguilo, Miguel. “Inverse Strategies For Characterization Of Material Properties .” 2011. Thesis, Cornell University. Accessed October 18, 2019. http://hdl.handle.net/1813/33569.

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

MLA Handbook (7^th Edition):

Aguilo, Miguel. “Inverse Strategies For Characterization Of Material Properties .” 2011. Web. 18 Oct 2019.

Vancouver:

Aguilo M. Inverse Strategies For Characterization Of Material Properties . [Internet] [Thesis]. Cornell University; 2011. [cited 2019 Oct 18]. Available from: http://hdl.handle.net/1813/33569.

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

Council of Science Editors:

Aguilo M. Inverse Strategies For Characterization Of Material Properties . [Thesis]. Cornell University; 2011. Available from: http://hdl.handle.net/1813/33569

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

Louisiana State University

13. Regmi, Bishnu Prasad. GUMBOS- and Ionic Liquid-Coated Quartz Crystal Microbalance Sensors for Detection and Molecular Weight Determination of Organic Vapors.

Degree: PhD, Chemistry, 2014, Louisiana State University

URL: etd-07082014-173616 ; https://digitalcommons.lsu.edu/gradschool_dissertations/3323

► There has been an ever-increasing demand for the development of high-performance sensing devices for detection and discrimination of volatile organic compounds (VOCs) present in different… (more)

▼ There has been an ever-increasing demand for the development of high-performance sensing devices for detection and discrimination of volatile organic compounds (VOCs) present in different environments. Among a number of sensing devices currently available, sorption-based sensors are particularly attractive because they are simple and inexpensive, require low power, and are appropriate for fabrication of multisensor arrays. A sorption-based sensor is comprised of a chemically active coating immobilized on the surface of a physical transducer. The chemically active film interacts with analytes, and the transducer converts the binding event into an electrical signal. This dissertation is focused on a sorption-based sensor prepared by using ionic liquids (ILs) and a group of uniform materials based on organic salts (GUMBOS) as the sensing materials and the quartz crystal microbalance (QCM) as the transducer. ILs are defined as organic salts which melt below 100 °C, and similar organic salts with melting point between 25 and 250 °C are defined as GUMBOS. In this research, a series of films comprising binary blends of an IL (or GUMBOS) and polymer are deposited onto the QCM surface in order to evaluate their vapor-sensing characteristics. The QCM sensors on exposure to organic vapors displayed a change in frequency and motional resistance, and both of these parameters were simultaneously measured. Examination of the data revealed an interesting relationship between the QCM parameters and the molecular weight of the absorbed vapors. The initial findings are reported in Chapter 2 of this dissertation. Additional studies were conducted in an effort to fully understand the interesting behavior of this type of material. More elaborate studies along with the theoretical rationale for the relationship between the QCM parameters and the molecular weight of vapors are presented in Chapter 3. Another important aspect of this dissertation is the design of highly sensitive materials for vapor-sensing applications. Toward this end, two representative GUMBOS were synthesized using porphyrin and phthalocyanine derivatives. The QCM device coated with these GUMBOS exhibited a rapid response and high sensitivity toward different organic vapors. Altogether, these studies demonstrate the true potential of this type of materials for vapor-sensing applications.

Subjects/Keywords: Viscoelasticity; Maxwell; Modeling; QCM-D

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Regmi, B. P. (2014). GUMBOS- and Ionic Liquid-Coated Quartz Crystal Microbalance Sensors for Detection and Molecular Weight Determination of Organic Vapors. (Doctoral Dissertation). Louisiana State University. Retrieved from etd-07082014-173616 ; https://digitalcommons.lsu.edu/gradschool_dissertations/3323

Chicago Manual of Style (16^th Edition):

Regmi, Bishnu Prasad. “GUMBOS- and Ionic Liquid-Coated Quartz Crystal Microbalance Sensors for Detection and Molecular Weight Determination of Organic Vapors.” 2014. Doctoral Dissertation, Louisiana State University. Accessed October 18, 2019. etd-07082014-173616 ; https://digitalcommons.lsu.edu/gradschool_dissertations/3323.

MLA Handbook (7^th Edition):

Regmi, Bishnu Prasad. “GUMBOS- and Ionic Liquid-Coated Quartz Crystal Microbalance Sensors for Detection and Molecular Weight Determination of Organic Vapors.” 2014. Web. 18 Oct 2019.

Vancouver:

Regmi BP. GUMBOS- and Ionic Liquid-Coated Quartz Crystal Microbalance Sensors for Detection and Molecular Weight Determination of Organic Vapors. [Internet] [Doctoral dissertation]. Louisiana State University; 2014. [cited 2019 Oct 18]. Available from: etd-07082014-173616 ; https://digitalcommons.lsu.edu/gradschool_dissertations/3323.

Council of Science Editors:

Regmi BP. GUMBOS- and Ionic Liquid-Coated Quartz Crystal Microbalance Sensors for Detection and Molecular Weight Determination of Organic Vapors. [Doctoral Dissertation]. Louisiana State University; 2014. Available from: etd-07082014-173616 ; https://digitalcommons.lsu.edu/gradschool_dissertations/3323

Cornell University

14. Zhu, Haolin. Two-Way Coupling Of Multiphase Transport And Viscoelastic Large Deformation Of Unsaturated Swelling Porous Materials .

Degree: 2012, Cornell University

URL: http://hdl.handle.net/1813/29326

► Multiphase transport in unsaturated swelling porous materials involves fluid mass transport, heat transfer as well as swelling of the porous solid matrix. Neglecting the deformation… (more)

▼ Multiphase transport in unsaturated swelling porous materials involves fluid mass transport, heat transfer as well as swelling of the porous solid matrix. Neglecting the deformation of the solid matrix can lead to erroneous results when modeling transport phenomena in porous materials. In particular, many porous materials exhibit viscoelastic effect upon wetting/drying, which can expedite or slow the transport process. This work presents modeling and simulation of two-way coupling of multiphase transport and viscoelastic large deformation of unsaturated swelling porous systems based on fundamental physics. The work includes the development of a thermomechanical theory for multiphase transport in unsaturated swelling porous media based on the Hybrid Mixture Theory (saturated systems can also be modeled as a special case of this general theory). The theory includes three phases: solid matrix, fluid and air and uses the Coleman-Noll procedure to obtain restrictions on the form of the constitutive equations. Derived relationships include, for example, a modified Darcy's law, which takes into account both Fickian and non-Fickian transport, and a viscoelastic constitutive relationship that relates the stress and strain tensors for the solid phase. A model is then developed based on this theory for isothermal conditions which involves a simple form of a differential-integral equation that governs the fluid transport and is fully coupled with the solid large deformation. Numerical implementation of this model is then presented that involves a finite element analysis of water absorption of plane sheet pasta and numerical results of sorption curves show good agreement with experimental results obtained from the literature. Importance of including viscoelastic relaxation is investigated for soaking processes of pasta. Drying of potato is also considered in this work as an important example of two-way coupling of multiphase transport and viscoelastic large deformation of the solid matrix of porous materials because during drying processes, the transition of outer surface of the material from rubbery to glassy state at low moisture content can slow or stop shrinkage of the materials, and thus viscoelasticity plays an important role. Advisors/Committee Members: Zehnder, Alan Taylor (committeeMember), Datta, Ashim K (committeeMember).

Subjects/Keywords: Porous materials; Swelling; Viscoelasticity

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Zhu, H. (2012). Two-Way Coupling Of Multiphase Transport And Viscoelastic Large Deformation Of Unsaturated Swelling Porous Materials . (Thesis). Cornell University. Retrieved from http://hdl.handle.net/1813/29326

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):

Zhu, Haolin. “Two-Way Coupling Of Multiphase Transport And Viscoelastic Large Deformation Of Unsaturated Swelling Porous Materials .” 2012. Thesis, Cornell University. Accessed October 18, 2019. http://hdl.handle.net/1813/29326.

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

MLA Handbook (7^th Edition):

Zhu, Haolin. “Two-Way Coupling Of Multiphase Transport And Viscoelastic Large Deformation Of Unsaturated Swelling Porous Materials .” 2012. Web. 18 Oct 2019.

Vancouver:

Zhu H. Two-Way Coupling Of Multiphase Transport And Viscoelastic Large Deformation Of Unsaturated Swelling Porous Materials . [Internet] [Thesis]. Cornell University; 2012. [cited 2019 Oct 18]. Available from: http://hdl.handle.net/1813/29326.

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

Council of Science Editors:

Zhu H. Two-Way Coupling Of Multiphase Transport And Viscoelastic Large Deformation Of Unsaturated Swelling Porous Materials . [Thesis]. Cornell University; 2012. Available from: http://hdl.handle.net/1813/29326

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

Montana State University

15. Kanewske, Daniel Bert. Stress tensor symmetry preserving model applied to the 2-D viscoelastic flow of a biofilm.

Degree: College of Letters & Science, 2016, Montana State University

URL: https://scholarworks.montana.edu/xmlui/handle/1/12368

► The symmetry of the numeric representation of the stress tensor has been shown to be important for maintaining stability, in the sense of Hadamard, of… (more)

Subjects/Keywords: Biofilms.; Mathematical models.; Viscoelasticity.

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Kanewske, D. B. (2016). Stress tensor symmetry preserving model applied to the 2-D viscoelastic flow of a biofilm. (Thesis). Montana State University. Retrieved from https://scholarworks.montana.edu/xmlui/handle/1/12368

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):

Kanewske, Daniel Bert. “Stress tensor symmetry preserving model applied to the 2-D viscoelastic flow of a biofilm.” 2016. Thesis, Montana State University. Accessed October 18, 2019. https://scholarworks.montana.edu/xmlui/handle/1/12368.

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

MLA Handbook (7^th Edition):

Kanewske, Daniel Bert. “Stress tensor symmetry preserving model applied to the 2-D viscoelastic flow of a biofilm.” 2016. Web. 18 Oct 2019.

Vancouver:

Kanewske DB. Stress tensor symmetry preserving model applied to the 2-D viscoelastic flow of a biofilm. [Internet] [Thesis]. Montana State University; 2016. [cited 2019 Oct 18]. Available from: https://scholarworks.montana.edu/xmlui/handle/1/12368.

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

Council of Science Editors:

Kanewske DB. Stress tensor symmetry preserving model applied to the 2-D viscoelastic flow of a biofilm. [Thesis]. Montana State University; 2016. Available from: https://scholarworks.montana.edu/xmlui/handle/1/12368

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

McGill University

16. Navratil, Martin. Structure and viscoelastic properties of styrene-based ionomers.

Degree: PhD, Department of Chemistry., 1972, McGill University

URL: http://digitool.library.mcgill.ca/thesisfile70821.pdf

Subjects/Keywords: Styrene; Viscoelasticity

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Navratil, M. (1972). Structure and viscoelastic properties of styrene-based ionomers. (Doctoral Dissertation). McGill University. Retrieved from http://digitool.library.mcgill.ca/thesisfile70821.pdf

Chicago Manual of Style (16^th Edition):

Navratil, Martin. “Structure and viscoelastic properties of styrene-based ionomers.” 1972. Doctoral Dissertation, McGill University. Accessed October 18, 2019. http://digitool.library.mcgill.ca/thesisfile70821.pdf.

MLA Handbook (7^th Edition):

Navratil, Martin. “Structure and viscoelastic properties of styrene-based ionomers.” 1972. Web. 18 Oct 2019.

Vancouver:

Navratil M. Structure and viscoelastic properties of styrene-based ionomers. [Internet] [Doctoral dissertation]. McGill University; 1972. [cited 2019 Oct 18]. Available from: http://digitool.library.mcgill.ca/thesisfile70821.pdf.

Council of Science Editors:

Navratil M. Structure and viscoelastic properties of styrene-based ionomers. [Doctoral Dissertation]. McGill University; 1972. Available from: http://digitool.library.mcgill.ca/thesisfile70821.pdf

McGill University

17. Dutertre, Jean C. Wave propagation in visco-elastic materials.

Degree: PhD, Department of Civil Engineering and Applied Mechanics., 1972, McGill University

URL: http://digitool.library.mcgill.ca/thesisfile70756.pdf

Subjects/Keywords: Viscoelasticity.; Waves.

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Dutertre, J. C. (1972). Wave propagation in visco-elastic materials. (Doctoral Dissertation). McGill University. Retrieved from http://digitool.library.mcgill.ca/thesisfile70756.pdf

Chicago Manual of Style (16^th Edition):

Dutertre, Jean C. “Wave propagation in visco-elastic materials.” 1972. Doctoral Dissertation, McGill University. Accessed October 18, 2019. http://digitool.library.mcgill.ca/thesisfile70756.pdf.

MLA Handbook (7^th Edition):

Dutertre, Jean C. “Wave propagation in visco-elastic materials.” 1972. Web. 18 Oct 2019.

Vancouver:

Dutertre JC. Wave propagation in visco-elastic materials. [Internet] [Doctoral dissertation]. McGill University; 1972. [cited 2019 Oct 18]. Available from: http://digitool.library.mcgill.ca/thesisfile70756.pdf.

Council of Science Editors:

Dutertre JC. Wave propagation in visco-elastic materials. [Doctoral Dissertation]. McGill University; 1972. Available from: http://digitool.library.mcgill.ca/thesisfile70756.pdf

University of Waterloo

18. Charbonneau, Linda. Time-Dependent Tensile Properties of ETFE Foils.

Degree: 2011, University of Waterloo

URL: http://hdl.handle.net/10012/6190

► The purpose of this thesis is to provide an overview of ETFE foil, as it applies to pneumatic cushion cladding, with a focus on creep… (more)

▼ The purpose of this thesis is to provide an overview of ETFE foil, as it applies to pneumatic cushion cladding, with a focus on creep behavior of the material. Characteristics of ETFE, including weight, optics, insulation, flexibility, environmental properties, fire performance, cushion span and other features are discussed, and, where possible, are compared to the characteristics of glass panels used in similar applications. Relevant chemical and mechanical properties of ETFE are given. Load carrying concepts of tension structures and inflated cushions are discussed, as well as structural design methods for ETFE cushions. Several prominent structures constructed using ETFE foil are introduced and benefits and design issues associated with these structures are reviewed. When used in cushion applications, ETFE films are placed in constant tension, and are therefore subject to creep. Quantifying this creep is desirable so that it can be predicted during the design phase. Therefore, this thesis summarizes the findings of other researchers in the area of creep of ETFE as well as the general mechanical behavior of the material, and presents the results of uniaxial creep tests done for the purpose of this study. These tests included 24 hour uniaxial creep tests done at four stress levels on both the transverse and longitudinal directions of three different brands of film. Two thicknesses of the third film were acquired and both were tested. The stress levels were chosen to coincide with typical design tensile stresses for ETFE film, and to be similar to the levels tested by other researchers. The effects of the different stresses, brands, directions and thicknesses are evaluated and discussed. Three seven day creep tests were also done on one of the films, each at a different stress level. Constitutive viscoelastic and viscoplastic models were developed to represent the 24-hour creep data. The viscoelastic models were based on a four-element Kelvin model and the viscoplastic models were based on a power-law model. The model parameters were determined from the data using linear least squares fitting. Models were also developed for the seven day creep data. Several of these models were based only upon the first 24 hours of data, and were used to determine the applicability of the 24-hour creep models to long-term behavior. It was found that while a viscoelastic model appears to fit long-term creep most closely, the 24-hour models are inadequate for modeling longer time frames. Another method is required for predicting long-term creep. Nonlinear fitting of the parameters is recommended as a possible alternative for creating more accurate models. Longer-term creep tests are also recommended. Tensile tests were also done on the films to confirm mechanical properties supplied by the film manufacturers. Good agreement to the given values was found in the test data.

Subjects/Keywords: ETFE; Creep; Tension Structures; Viscoelasticity

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Charbonneau, L. (2011). Time-Dependent Tensile Properties of ETFE Foils. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/6190

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):

Charbonneau, Linda. “Time-Dependent Tensile Properties of ETFE Foils.” 2011. Thesis, University of Waterloo. Accessed October 18, 2019. http://hdl.handle.net/10012/6190.

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

MLA Handbook (7^th Edition):

Charbonneau, Linda. “Time-Dependent Tensile Properties of ETFE Foils.” 2011. Web. 18 Oct 2019.

Vancouver:

Charbonneau L. Time-Dependent Tensile Properties of ETFE Foils. [Internet] [Thesis]. University of Waterloo; 2011. [cited 2019 Oct 18]. Available from: http://hdl.handle.net/10012/6190.

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

Council of Science Editors:

Charbonneau L. Time-Dependent Tensile Properties of ETFE Foils. [Thesis]. University of Waterloo; 2011. Available from: http://hdl.handle.net/10012/6190

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

University of Illinois – Urbana-Champaign

19. Bharadwaj, Narayanan Ashwin Kumar. Asymptotically nonliner oscillatory shear: theory, modeling, measurements and applications of nonlinear elasticity to stimuli-responsive composites.

Degree: PhD, Mechanical Engineering, 2016, University of Illinois – Urbana-Champaign

URL: http://hdl.handle.net/2142/93007

► Viscoelastic materials, such as crosslinked networks of synthetic and biological polymers, exhibit a nonlinear rheological response to mechanical deformation. Oscillatory shear is a popular deformation… (more)

▼ Viscoelastic materials, such as crosslinked networks of synthetic and biological polymers, exhibit a nonlinear rheological response to mechanical deformation. Oscillatory shear is a popular deformation protocol for viscoelastic characterization, both linear and nonlinear, the latter referred to as large amplitude oscillatory shear (LAOS). However, the accompanying nonlinear material response in LAOS is challenging to interpret and requires non-trivial material descriptions. The goal of this thesis is to provide a new paradigm of nonlinear rheological characterization using oscillatory shear deformation as well as to demonstrate applications of nonlinear viscoelastic materials, involving stimuli responsive polymer-colloid composites. A nonlinear viscoelastic response in LAOS is high dimensional, covering the entire range of the 2D Pipkin space of deformation amplitude and frequency. A low-dimensional language and framework is introduced for viscoelastic characterization using asymptotic material functions in oscillatory shear, referred to as medium amplitude oscillatory shear (MAOS). These material functions, four in number, emerge from an asymptotic expansion in deformation amplitude and depend only on the oscillatory frequency. They carry physically meaningful inter- and intra-cycle information, for example, softening/stiffening and thickening/thinning of the stress response. For the first time, experimental measurements are shown for all four asymptotic nonlinearities. Parallel disk measurements in the MAOS regime require a correction for the apparent stress response. In this regime, the derivatives appearing in the general stress correction are constant over the range of interest, and this allows exact single-point corrections for all four asymptotic nonlinearities. Experimental measurements are presented for the asymptotically-nonlinear signals on an entangled polymer melt, using both parallel disk and cone fixtures. The corrected (amplified) parallel disk signals match the measurements with the cone. Using a fourth order fluid expansion, universal frequency scaling and interrelations are derived for asymptotic nonlinearities in the terminal regime, defined by the limit of De<<1. Experimental measurements, consistent with such predictions, are presented for an entangled polymer melt in the terminal regime. Beyond the terminal regime, at higher frequencies, signs and magnitudes cannot be universally predicted, leaving these as free parameters that depend on the specifics of the material microstructure or constitutive model. A library of expectations of signatures (or fingerprints) is developed for all four asymptotically-nonlinear material functions for seven nonlinear constitutive models. The fingerprints are different in magnitude, frequency-scaling, curve shapes and sign changes, and distinguish the models. They obey the terminal regime inter-relations and frequency scaling, and are driven by strain-rates at small De and strains at large De. Some constitutive models exhibit multiple sign changes at… Advisors/Committee Members: Ewoldt, Randy H (advisor), Ewoldt, Randy H (Committee Chair), Schweizer, Kenneth S (committee member), Hilgenfeldt, Sascha (committee member), Rogers, Simon (committee member).

Subjects/Keywords: Nonlinear Viscoelasticity; Stimuli-responsive materials

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Bharadwaj, N. A. K. (2016). Asymptotically nonliner oscillatory shear: theory, modeling, measurements and applications of nonlinear elasticity to stimuli-responsive composites. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/93007

Chicago Manual of Style (16^th Edition):

Bharadwaj, Narayanan Ashwin Kumar. “Asymptotically nonliner oscillatory shear: theory, modeling, measurements and applications of nonlinear elasticity to stimuli-responsive composites.” 2016. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed October 18, 2019. http://hdl.handle.net/2142/93007.

MLA Handbook (7^th Edition):

Bharadwaj, Narayanan Ashwin Kumar. “Asymptotically nonliner oscillatory shear: theory, modeling, measurements and applications of nonlinear elasticity to stimuli-responsive composites.” 2016. Web. 18 Oct 2019.

Vancouver:

Bharadwaj NAK. Asymptotically nonliner oscillatory shear: theory, modeling, measurements and applications of nonlinear elasticity to stimuli-responsive composites. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2016. [cited 2019 Oct 18]. Available from: http://hdl.handle.net/2142/93007.

Council of Science Editors:

Bharadwaj NAK. Asymptotically nonliner oscillatory shear: theory, modeling, measurements and applications of nonlinear elasticity to stimuli-responsive composites. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2016. Available from: http://hdl.handle.net/2142/93007

University of Notre Dame

20. Ziheng Wu. Measures of bone quality and their relationship to bone mechanical properties</h1>.

Degree: PhD, Aerospace and Mechanical Engineering, 2011, University of Notre Dame

URL: https://curate.nd.edu/show/jh343r09d8g

► Measurement of bone mineral density (BMD) has been used as a method for diagnosis of osteoporosis. However, this method does not account for the… (more)

▼ Measurement of bone mineral density (BMD) has been used as a method for diagnosis of osteoporosis. However, this method does not account for the influence of changes in bone quality. The objectives of this dissertation were to investigate viscoelastic properties of bone tissue using nanoindentation, identify the effects of disease, aging, gender and tissue compositions on bone mechanical properties, and study crack initiation and propagation in bone samples subjected to multiple loading modes. We compared the viscoelastic behavior of human cortical bone between genders by using nanoindentation at a fixed load of 10 mN to measure the creep time constant. Bones from females had a significantly greater time constant than bones from males. The creep time constants decreased with increasing tissue modulus. The mineralization, collagen content, and collagen crosslink density were analyzed to determine if the differences in viscoelastic behavior were explained by compositional differences in the bone. However, none of the parameters differed between genders, nor were they correlated to the viscoelastic time constant. The effect of ovariectomy on mechanical properties of ovine trabecular bone tissue was investigated using nanoindentation. Three groups of mature ewes were studied: one group was unoperated control and two other groups underwent bilateral ovariectomy and were sacrificed either 12 months (OVX-1) or 24 months (OVX-2) after surgery. Mineralization and elastic properties decreased and the creep time constant increased after ovariectomy. As the elastic properties recover as well as mineralization, the viscoelastic properties did not, indicating that there might be other factors in change of viscoelastic properties. Elastic modulus increased and creep time constants decreased with increasing mineralization, but the sensitivity to the change of mineralization depended on OVX status. This demonstrated that mineralization altered both elastic and viscoelastic properties, but may be in different extent for different OVX status. Microdamage initiation and propagation in human trabecular bone was studied. The on-axis specimens were subjected to torsional, compressive and combined torsional and compressive overloading at 2% principal strain level. The combined overloading gave rise to 60.52% more microcrack density than torsional overloading and three times greater than compressive overloading. Both the density of induced and propagating microdamage depended on the density of pre-existing microdamage, suggesting that the pre-existing microdamage not only provide crack propagating sites, but also indicated high risk to new cracks. Taken together, the results indicate that microdamage burden may contribute to osteoporotic fractures by increasing the risk of further damage formation, which decreases modulus and strength. Overall, this research provides insight into bone viscoelastic properties and microdamage by studying creep behavior, tissue composition, disease and… Advisors/Committee Members: Glen L. Niebur, Committee Member, Steven Schmid, Committee Member, Timothy Ovaert, Committee Member, Ryan Roeder, Committee Member.

Subjects/Keywords: Bone quality; Viscoelasticity; Microdamage; Nanoin

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Wu, Z. (2011). Measures of bone quality and their relationship to bone mechanical properties</h1>. (Doctoral Dissertation). University of Notre Dame. Retrieved from https://curate.nd.edu/show/jh343r09d8g

Chicago Manual of Style (16^th Edition):

Wu, Ziheng. “Measures of bone quality and their relationship to bone mechanical properties</h1>.” 2011. Doctoral Dissertation, University of Notre Dame. Accessed October 18, 2019. https://curate.nd.edu/show/jh343r09d8g.

MLA Handbook (7^th Edition):

Wu, Ziheng. “Measures of bone quality and their relationship to bone mechanical properties</h1>.” 2011. Web. 18 Oct 2019.

Vancouver:

Wu Z. Measures of bone quality and their relationship to bone mechanical properties</h1>. [Internet] [Doctoral dissertation]. University of Notre Dame; 2011. [cited 2019 Oct 18]. Available from: https://curate.nd.edu/show/jh343r09d8g.

Council of Science Editors:

Wu Z. Measures of bone quality and their relationship to bone mechanical properties</h1>. [Doctoral Dissertation]. University of Notre Dame; 2011. Available from: https://curate.nd.edu/show/jh343r09d8g

University of Toronto

21. van Wijk, Ernst. Jet Oscillation in Abrasive Slurry-Jet Machining as a Function of Polymer Concentration and Nozzle Geometry.

Degree: 2018, University of Toronto

URL: http://hdl.handle.net/1807/89497

►

This thesis investigated the effects of polymer concentration and nozzle design on jet stability for polymeric abrasive slurry-jet channel machining in glass. Conical nozzle contractions,… (more)

Subjects/Keywords: Jet Oscillation; Machining; Viscoelasticity; 0548

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

van Wijk, E. (2018). Jet Oscillation in Abrasive Slurry-Jet Machining as a Function of Polymer Concentration and Nozzle Geometry. (Masters Thesis). University of Toronto. Retrieved from http://hdl.handle.net/1807/89497

Chicago Manual of Style (16^th Edition):

van Wijk, Ernst. “Jet Oscillation in Abrasive Slurry-Jet Machining as a Function of Polymer Concentration and Nozzle Geometry.” 2018. Masters Thesis, University of Toronto. Accessed October 18, 2019. http://hdl.handle.net/1807/89497.

MLA Handbook (7^th Edition):

van Wijk, Ernst. “Jet Oscillation in Abrasive Slurry-Jet Machining as a Function of Polymer Concentration and Nozzle Geometry.” 2018. Web. 18 Oct 2019.

Vancouver:

van Wijk E. Jet Oscillation in Abrasive Slurry-Jet Machining as a Function of Polymer Concentration and Nozzle Geometry. [Internet] [Masters thesis]. University of Toronto; 2018. [cited 2019 Oct 18]. Available from: http://hdl.handle.net/1807/89497.

Council of Science Editors:

van Wijk E. Jet Oscillation in Abrasive Slurry-Jet Machining as a Function of Polymer Concentration and Nozzle Geometry. [Masters Thesis]. University of Toronto; 2018. Available from: http://hdl.handle.net/1807/89497

University of Texas – Austin

22. Xu, Qinwu. Development of a computational method for inverting dynamic moduli of multilayer systems with applications to flexible pavements.

Degree: PhD, Civil Engineering, 2014, University of Texas – Austin

URL: http://hdl.handle.net/2152/25943

► Most existing computational methods for inverting material properties of multilayer systems have focused primarily on elastic properties of materials or a static approach. Typically, they… (more)

▼ Most existing computational methods for inverting material properties of multilayer systems have focused primarily on elastic properties of materials or a static approach. Typically, they are based on a two-stage approach: (I) modeling structural responses with a computer program, and (II) estimating layer properties mathematically using the response outputs determined in stage I without interactions with the governing state partial-differential-equation (PDE) of stage I. This two-stage approach may not be accurate and efficient enough for inverting larger scale model parameters. The objective of this research was to develop a computational method to invert dynamic moduli of multilayer systems with applications to flexible pavements under falling weight deflectometer (FWD) tests, thereby advancing existing methods and fostering understanding of material behaviors. This research first developed a finite-element and Newton-Raphson method to invert layer elastic moduli using FWD data. The model improved the moduli seeds estimation and achieved a satisfactory accuracy based on Monte Carlo simulations, addressing the common back-calculation issue of no unique solutions. Consequently, a time-domain finite-element method was developed to simulate dynamic-viscoelastic responses of the multilayer systems under loading pulses. Simulation results demonstrated that the dynamic-viscoelastic-damping-coupled model could emulate structural responses more accurately, thereby advancing existing simulation approaches. By using the dynamic-viscoelastic-response model as one computation module, this research led to the development of a PDE-constrained Lagrangian optimization method to invert dynamic moduli and viscoelastic properties of multilayer systems. The Lagrangian function was used as an objective function, with a regularization term and governing-state PDE constraint. Both the first-order (gradient) and second-order variation (Hessian matrix) of the Lagrangian were computed to satisfy necessary and sufficient optimality conditions, and Armijo rule was modified to determine a stable step length. The developed method improved computation speed significantly, and it is superior for large-scale inverse problems. The model was implemented for evaluating flexible pavements under FWD tests and for inverting the master curve of dynamic moduli of the asphalt layer. Independent computer coding was developed for all numerical methods. The computational methods developed may also be applied to other multilayer systems, such as tissues and sandwich structures at different time and length scales. Advisors/Committee Members: Prozzi, Jorge Alberto (advisor).

Subjects/Keywords: Inverse method; Viscoelasticity; Multilayer

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Xu, Q. (2014). Development of a computational method for inverting dynamic moduli of multilayer systems with applications to flexible pavements. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/25943

Chicago Manual of Style (16^th Edition):

Xu, Qinwu. “Development of a computational method for inverting dynamic moduli of multilayer systems with applications to flexible pavements.” 2014. Doctoral Dissertation, University of Texas – Austin. Accessed October 18, 2019. http://hdl.handle.net/2152/25943.

MLA Handbook (7^th Edition):

Xu, Qinwu. “Development of a computational method for inverting dynamic moduli of multilayer systems with applications to flexible pavements.” 2014. Web. 18 Oct 2019.

Vancouver:

Xu Q. Development of a computational method for inverting dynamic moduli of multilayer systems with applications to flexible pavements. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2014. [cited 2019 Oct 18]. Available from: http://hdl.handle.net/2152/25943.

Council of Science Editors:

Xu Q. Development of a computational method for inverting dynamic moduli of multilayer systems with applications to flexible pavements. [Doctoral Dissertation]. University of Texas – Austin; 2014. Available from: http://hdl.handle.net/2152/25943

The Ohio State University

23. Song, Yoon Soo. A study of the transient phenomena of a viscoelastic material.

Degree: PhD, Graduate School, 1975, The Ohio State University

URL: http://rave.ohiolink.edu/etdc/view?acc_num=osu1486993219478823

Subjects/Keywords: Engineering; Viscoelasticity; Polymers

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Song, Y. S. (1975). A study of the transient phenomena of a viscoelastic material. (Doctoral Dissertation). The Ohio State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=osu1486993219478823

Chicago Manual of Style (16^th Edition):

Song, Yoon Soo. “A study of the transient phenomena of a viscoelastic material.” 1975. Doctoral Dissertation, The Ohio State University. Accessed October 18, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1486993219478823.

MLA Handbook (7^th Edition):

Song, Yoon Soo. “A study of the transient phenomena of a viscoelastic material.” 1975. Web. 18 Oct 2019.

Vancouver:

Song YS. A study of the transient phenomena of a viscoelastic material. [Internet] [Doctoral dissertation]. The Ohio State University; 1975. [cited 2019 Oct 18]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1486993219478823.

Council of Science Editors:

Song YS. A study of the transient phenomena of a viscoelastic material. [Doctoral Dissertation]. The Ohio State University; 1975. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1486993219478823

The Ohio State University

24. Singh, Yatindra. Effect of cooking temperature treatment on the textural and viscoelastic characteristics of Frankfurter emulsion.

Degree: PhD, Graduate School, 1977, The Ohio State University

URL: http://rave.ohiolink.edu/etdc/view?acc_num=osu1487063539785349

Subjects/Keywords: Engineering; Emulsions; Viscoelasticity

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Singh, Y. (1977). Effect of cooking temperature treatment on the textural and viscoelastic characteristics of Frankfurter emulsion. (Doctoral Dissertation). The Ohio State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=osu1487063539785349

Chicago Manual of Style (16^th Edition):

Singh, Yatindra. “Effect of cooking temperature treatment on the textural and viscoelastic characteristics of Frankfurter emulsion.” 1977. Doctoral Dissertation, The Ohio State University. Accessed October 18, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487063539785349.

MLA Handbook (7^th Edition):

Singh, Yatindra. “Effect of cooking temperature treatment on the textural and viscoelastic characteristics of Frankfurter emulsion.” 1977. Web. 18 Oct 2019.

Vancouver:

Singh Y. Effect of cooking temperature treatment on the textural and viscoelastic characteristics of Frankfurter emulsion. [Internet] [Doctoral dissertation]. The Ohio State University; 1977. [cited 2019 Oct 18]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1487063539785349.

Council of Science Editors:

Singh Y. Effect of cooking temperature treatment on the textural and viscoelastic characteristics of Frankfurter emulsion. [Doctoral Dissertation]. The Ohio State University; 1977. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1487063539785349

The Ohio State University

25. Lander, Herbert R. An evaluation of viscoelastic response to oscillatory shear .

Degree: PhD, Graduate School, 1977, The Ohio State University

URL: http://rave.ohiolink.edu/etdc/view?acc_num=osu1487064256739685

Subjects/Keywords: Engineering; Oscillations; Viscoelasticity

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Lander, H. R. (1977). An evaluation of viscoelastic response to oscillatory shear . (Doctoral Dissertation). The Ohio State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=osu1487064256739685

Chicago Manual of Style (16^th Edition):

Lander, Herbert R. “An evaluation of viscoelastic response to oscillatory shear .” 1977. Doctoral Dissertation, The Ohio State University. Accessed October 18, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487064256739685.

MLA Handbook (7^th Edition):

Lander, Herbert R. “An evaluation of viscoelastic response to oscillatory shear .” 1977. Web. 18 Oct 2019.

Vancouver:

Lander HR. An evaluation of viscoelastic response to oscillatory shear . [Internet] [Doctoral dissertation]. The Ohio State University; 1977. [cited 2019 Oct 18]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1487064256739685.

Council of Science Editors:

Lander HR. An evaluation of viscoelastic response to oscillatory shear . [Doctoral Dissertation]. The Ohio State University; 1977. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1487064256739685

26. Pavan, Théo Zeferino. Estudos de técnicas ultrassônicas para análise de propriedades mecânicas de meios viscoelásticos.

Degree: PhD, Física Aplicada à Medicina e Biologia, 2011, University of São Paulo

URL: http://www.teses.usp.br/teses/disponiveis/59/59135/tde-17042011-163130/ ;

► Mudanças nas características mecânicas de tecidos biológicos geralmente estão relacionadas com algum tipo de patologia. Técnicas de imagens elastográficas são métodos quantitativos de se estimar… (more)

▼ Mudanças nas características mecânicas de tecidos biológicos geralmente estão relacionadas com algum tipo de patologia. Técnicas de imagens elastográficas são métodos quantitativos de se estimar as propriedades mecânicas de tecidos. Em geral, o objetivo destas técnicas de imagem é medir o movimento do tecido provocado por uma força interna ou externa. Por meio desse movimento, parâmetros viscoelásticos do meio em análise são reconstruídos. A força de excitação pode ser tanto quasi-estática, como dinâmica. O trabalho apresentado nesta tese aborda as técnicas de elastografia dinâmica e quasi-estática. Na abordagem quasi-estática, a elasticidade não-linear é estudada através de phantoms com características que simulam as do tecido humano. Na abordagem dinâmica, o movimento dinâmico promovido por força de radicação acústica é avaliado através de técnicas ultrassônicas e magnéticas. O desenvolvimento de materiais para serem usados como phantoms para elastografia por ultrassom é descrito. O comportamento elástico não-linear desses materiais foi analisado através de resultados de ensaios mecânicos. Esses materiais foram desenvolvidos para apresentarem uma relação tensão/deformação que não dependesse do módulo de cisalhamento para pequenas deformações, e foram projetados para serem usados em phantoms em que configurações heterogêneas são empregadas (por exemplo, phantoms com inclusões esféricas). O efeito da não-linearidade elástica dos materiais sobre o contraste, a relação sinal ruído e a relação contraste ruído de imagens elastográficas de um phantom contendo inclusões esféricas, sofrendo altas deformações (até 20%) foi investigada. Foi demonstrada a viabilidade de se medir movimentos vibratórios induzidos por feixes acústicos confocais através de um ultrassom Doppler que utiliza ondas contínuas. A interferência de feixes de ultrassom com pequena diferença de frequências provoca o aparecimento de uma força dinâmica no alvo. Foi demonstrada a formação de imagens de uma esfera rígida imersa em um phantom viscoelástico, através da varredura de ambos os transdutores (confocal e Doppler) pelo plano focal do transdutor confocal. O comportamento dinâmico de uma esfera magnetizada induzido por força de radicação acústica foi investigado. A esfera foi suspensa em água em configuração de pêndulo. Forcas estática de longa (poucos segundos) e curta (poucos milisegundos) duração foram utilizadas. O movimento da esfera foi medido através de um sensor magnetoresistivo. A partir da nova posição de equilíbrio em resposta à força de radicação de longa duração, a amplitude dessa força foi estimada. Para se estimar a viscosidade da água, o movimento de relaxação da esfera após a força ter sido desligada foi ajustado a um modelo de movimento-harmônico amortecido. O movimento de uma esfera rígida imersa em um phantom feito de gelatina, deslocada por força de radicação acústica, foi avaliado por meio de ecos ultrassônicas obtidos com um sistema pulso/eco. A teoria utilizada para se estimar os parâmetros viscoelásticos do phantom, usando o… Advisors/Committee Members: Carneiro, Antonio Adilton Oliveira.

Subjects/Keywords: Elastografia; Elastography; Ultrasound; Ultrassom; Viscoelasticidade; Viscoelasticity

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Pavan, T. Z. (2011). Estudos de técnicas ultrassônicas para análise de propriedades mecânicas de meios viscoelásticos. (Doctoral Dissertation). University of São Paulo. Retrieved from http://www.teses.usp.br/teses/disponiveis/59/59135/tde-17042011-163130/ ;

Chicago Manual of Style (16^th Edition):

Pavan, Théo Zeferino. “Estudos de técnicas ultrassônicas para análise de propriedades mecânicas de meios viscoelásticos.” 2011. Doctoral Dissertation, University of São Paulo. Accessed October 18, 2019. http://www.teses.usp.br/teses/disponiveis/59/59135/tde-17042011-163130/ ;.

MLA Handbook (7^th Edition):

Pavan, Théo Zeferino. “Estudos de técnicas ultrassônicas para análise de propriedades mecânicas de meios viscoelásticos.” 2011. Web. 18 Oct 2019.

Vancouver:

Pavan TZ. Estudos de técnicas ultrassônicas para análise de propriedades mecânicas de meios viscoelásticos. [Internet] [Doctoral dissertation]. University of São Paulo; 2011. [cited 2019 Oct 18]. Available from: http://www.teses.usp.br/teses/disponiveis/59/59135/tde-17042011-163130/ ;.

Council of Science Editors:

Pavan TZ. Estudos de técnicas ultrassônicas para análise de propriedades mecânicas de meios viscoelásticos. [Doctoral Dissertation]. University of São Paulo; 2011. Available from: http://www.teses.usp.br/teses/disponiveis/59/59135/tde-17042011-163130/ ;

University of Alberta

27. Peng, Yanning. A class of viscoelastic waves in rods and fluid filled tubes.

Degree: MS, Department of Mathematics, 1991, University of Alberta

URL: https://era.library.ualberta.ca/files/3197xp146

Subjects/Keywords: Viscoelasticity – Mathematical models.

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Peng, Y. (1991). A class of viscoelastic waves in rods and fluid filled tubes. (Masters Thesis). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/3197xp146

Chicago Manual of Style (16^th Edition):

Peng, Yanning. “A class of viscoelastic waves in rods and fluid filled tubes.” 1991. Masters Thesis, University of Alberta. Accessed October 18, 2019. https://era.library.ualberta.ca/files/3197xp146.

MLA Handbook (7^th Edition):

Peng, Yanning. “A class of viscoelastic waves in rods and fluid filled tubes.” 1991. Web. 18 Oct 2019.

Vancouver:

Peng Y. A class of viscoelastic waves in rods and fluid filled tubes. [Internet] [Masters thesis]. University of Alberta; 1991. [cited 2019 Oct 18]. Available from: https://era.library.ualberta.ca/files/3197xp146.

Council of Science Editors:

Peng Y. A class of viscoelastic waves in rods and fluid filled tubes. [Masters Thesis]. University of Alberta; 1991. Available from: https://era.library.ualberta.ca/files/3197xp146

University of Alberta

28. Krebes, Edward S. Seismic body waves in anelastic media.

Degree: PhD, Department of Physics, 1980, University of Alberta

URL: https://era.library.ualberta.ca/files/4q77ft54s

Subjects/Keywords: Seismic waves.; Viscoelasticity.

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Krebes, E. S. (1980). Seismic body waves in anelastic media. (Doctoral Dissertation). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/4q77ft54s

Chicago Manual of Style (16^th Edition):

Krebes, Edward S. “Seismic body waves in anelastic media.” 1980. Doctoral Dissertation, University of Alberta. Accessed October 18, 2019. https://era.library.ualberta.ca/files/4q77ft54s.

MLA Handbook (7^th Edition):

Krebes, Edward S. “Seismic body waves in anelastic media.” 1980. Web. 18 Oct 2019.

Vancouver:

Krebes ES. Seismic body waves in anelastic media. [Internet] [Doctoral dissertation]. University of Alberta; 1980. [cited 2019 Oct 18]. Available from: https://era.library.ualberta.ca/files/4q77ft54s.

Council of Science Editors:

Krebes ES. Seismic body waves in anelastic media. [Doctoral Dissertation]. University of Alberta; 1980. Available from: https://era.library.ualberta.ca/files/4q77ft54s

Texas A&M University

29. Muddana, Hari Shankar. Integrated biomechanical model of cells embedded in extracellular matrix.

Degree: 2009, Texas A&M University

URL: http://hdl.handle.net/1969.1/ETD-TAMU-1074

► Nature encourages diversity in life forms (morphologies). The study of morphogenesis deals with understanding those processes that arise during the embryonic development of an organism.… (more)

▼ Nature encourages diversity in life forms (morphologies). The study of morphogenesis deals with understanding those processes that arise during the embryonic development of an organism. These processes control the organized spatial distribution of cells, which in turn gives rise to the characteristic form for the organism. Morphogenesis is a multi-scale modeling problem that can be studied at the molecular, cellular, and tissue levels. Here, we study the problem of morphogenesis at the cellular level by introducing an integrated biomechanical model of cells embedded in the extracellular matrix. The fundamental aspects of mechanobiology essential for studying morphogenesis at the cellular level are the cytoskeleton, extracellular matrix (ECM), and cell adhesion. Cells are modeled using tensegrity architecture. Our simulations demonstrate cellular events, such as differentiation, migration, and division using an extended tensegrity architecture that supports dynamic polymerization of the micro-filaments of the cell. Thus, our simulations add further support to the cellular tensegrity model. Viscoelastic behavior of extracellular matrix is modeled by extending one-dimensional mechanical models (by Maxwell and by Voigt) to three dimensions using finite element methods. The cell adhesion is modeled as a general Velcro-type model. We integrated the mechanics and dynamics of cell, ECM, and cell adhesion with a geometric model to create an integrated biomechanical model. In addition, the thesis discusses various computational issues, including generating the finite element mesh, mesh refinement, re-meshing, and solution mapping. As is known from a molecular level perspective, the genetic regulatory network of the organism controls this spatial distribution of cells along with some environmental factors modulating the process. The integrated biomechanical model presented here, besides generating interesting morphologies, can serve as a mesoscopic-scale platform upon which future work can correlate with the underlying genetic network. Advisors/Committee Members: Choe, Yoonsuck (advisor), McCormick, Bruce H. (advisor), Abbott, Louise (committee member), Keyser, John (committee member).

Subjects/Keywords: Tensegrity; Viscoelasticity; cytoskeleton; extracellular matrix; cell adhesion

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Muddana, H. S. (2009). Integrated biomechanical model of cells embedded in extracellular matrix. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-1074

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):

Muddana, Hari Shankar. “Integrated biomechanical model of cells embedded in extracellular matrix.” 2009. Thesis, Texas A&M University. Accessed October 18, 2019. http://hdl.handle.net/1969.1/ETD-TAMU-1074.

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

MLA Handbook (7^th Edition):

Muddana, Hari Shankar. “Integrated biomechanical model of cells embedded in extracellular matrix.” 2009. Web. 18 Oct 2019.

Vancouver:

Muddana HS. Integrated biomechanical model of cells embedded in extracellular matrix. [Internet] [Thesis]. Texas A&M University; 2009. [cited 2019 Oct 18]. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1074.

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

Council of Science Editors:

Muddana HS. Integrated biomechanical model of cells embedded in extracellular matrix. [Thesis]. Texas A&M University; 2009. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-1074

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

Texas A&M University

30. Srinivasa Parthasarathy, Atul. A Model for the Nonlinear Mechanical Behavior of Asphalt Binders and its Application in Prediction of Rutting Susceptibility.

Degree: 2013, Texas A&M University

URL: http://hdl.handle.net/1969.1/149603

► The mechanical behavior of asphalt binders is nonlinear. The binders exhibit shear thinning/thickening behavior in steady shear tests and non-proportational behavior in other standard viscoelastic… (more)

Subjects/Keywords: Viscoelasticity; Consitutive modeling; Gibbs-potential; Rutting

Record Details Similar Records Cite « Share

❌

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

APA (6^th Edition):

Srinivasa Parthasarathy, A. (2013). A Model for the Nonlinear Mechanical Behavior of Asphalt Binders and its Application in Prediction of Rutting Susceptibility. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/149603

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):

Srinivasa Parthasarathy, Atul. “A Model for the Nonlinear Mechanical Behavior of Asphalt Binders and its Application in Prediction of Rutting Susceptibility.” 2013. Thesis, Texas A&M University. Accessed October 18, 2019. http://hdl.handle.net/1969.1/149603.

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

MLA Handbook (7^th Edition):

Srinivasa Parthasarathy, Atul. “A Model for the Nonlinear Mechanical Behavior of Asphalt Binders and its Application in Prediction of Rutting Susceptibility.” 2013. Web. 18 Oct 2019.

Vancouver:

Srinivasa Parthasarathy A. A Model for the Nonlinear Mechanical Behavior of Asphalt Binders and its Application in Prediction of Rutting Susceptibility. [Internet] [Thesis]. Texas A&M University; 2013. [cited 2019 Oct 18]. Available from: http://hdl.handle.net/1969.1/149603.

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

Council of Science Editors:

Srinivasa Parthasarathy A. A Model for the Nonlinear Mechanical Behavior of Asphalt Binders and its Application in Prediction of Rutting Susceptibility. [Thesis]. Texas A&M University; 2013. Available from: http://hdl.handle.net/1969.1/149603

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

Open Access Theses and Dissertations