subject:(Microelectromechanical system Design AND construction)

Ryerson University

1. Eskandari, Amiraslan. Design and optimization of compliant mechanical amplifiers.

Degree: 2013, Ryerson University

URL: https://digital.library.ryerson.ca/islandora/object/RULA%3A2825

► Piezoelectric (PZT) actuators are micro motion generators capable of producing a high displacement resolution and low strain with high force outputs. However, due to their… (more)

Subjects/Keywords: Piezoelectric devices – Design and construction; Actuators – Design and construction; Microelectromechanical system – Design and construction

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APA (6^th Edition):

Eskandari, A. (2013). Design and optimization of compliant mechanical amplifiers. (Thesis). Ryerson University. Retrieved from https://digital.library.ryerson.ca/islandora/object/RULA%3A2825

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):

Eskandari, Amiraslan. “Design and optimization of compliant mechanical amplifiers.” 2013. Thesis, Ryerson University. Accessed January 24, 2021. https://digital.library.ryerson.ca/islandora/object/RULA%3A2825.

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

MLA Handbook (7^th Edition):

Eskandari, Amiraslan. “Design and optimization of compliant mechanical amplifiers.” 2013. Web. 24 Jan 2021.

Vancouver:

Eskandari A. Design and optimization of compliant mechanical amplifiers. [Internet] [Thesis]. Ryerson University; 2013. [cited 2021 Jan 24]. Available from: https://digital.library.ryerson.ca/islandora/object/RULA%3A2825.

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

Council of Science Editors:

Eskandari A. Design and optimization of compliant mechanical amplifiers. [Thesis]. Ryerson University; 2013. Available from: https://digital.library.ryerson.ca/islandora/object/RULA%3A2825

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

Hong Kong University of Science and Technology

2. Sui, Wenshu. Design, fabrication and packaging of capacitive MEMS microphone using MEMS foundry.

Degree: 2017, Hong Kong University of Science and Technology

URL: http://repository.ust.hk/ir/Record/1783.1-88939 ; https://doi.org/10.14711/thesis-991012532267203412 ; http://repository.ust.hk/ir/bitstream/1783.1-88939/1/th_redirect.html

► With the increasing opportunities offered by the consumer market, the microphone industry is more important than ever. In this work, the design parameters of capacitive… (more)

▼ With the increasing opportunities offered by the consumer market, the microphone industry is more important than ever. In this work, the design parameters of capacitive MEMS microphone was analyzed based on a general one-dimensional (1D) model. The theoretical sensitivity of the capacitive microphone is shown to be a nonlinear function of diaphragm radius (a), thickness (h), back chamber length (L), the residual stress (σ_rs) and some other parameters. Based on the general 1D model, a critical diaphragm radius was found located at the inflection point of the sensitivity - radius scaling analysis curve, which reflects the minimal equivalent spring constant of the microphone. We then modified this 1D model by revising the diaphragm as a composited layer that is fitted to the PolyMUMPs process. The modified 1D model was applied to predict the critical design parameters of the capacitive MEMS microphone to be fabricated by the PolyMUMPs process, and the critical diaphragm radius of 300 μm is obtained. The agreement between experimental result and theoretical prediction verifies our general 1D model, and proves the critical value can be used to guide the design of capacitive microphone. As parylene can be utilized in the MEMS microphone field such as the movable diaphragm and packaging material for its great dielectric properties and high coating uniformity, the properties of parylene should be further studied. In this work, a comparative study of the viscoelasticity of parylene C was presented by using Nanoindentation technology and Molecular Dynamics (MD) simulations. By applying different types of loadings on parylene C films at different temperatures and frequencies, the complex modulus, relaxation modulus and glass transition temperature (T_g) of the parylene C were obtained. The predicted T_g determined from the temperature-dependent density change in the MD model is consistent with the results in the measurements and previous works. Furthermore, with Time-Temperature Superposition Principle (TTSP), the master curve of parylene C were successfully determined on its creep and relaxation behaviour, for the first time, which is critical for the parylene reliability study of bio-MEMS devices.

Subjects/Keywords: Microelectromechanical systems ; Microphone ; Design and construction

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APA (6^th Edition):

Sui, W. (2017). Design, fabrication and packaging of capacitive MEMS microphone using MEMS foundry. (Thesis). Hong Kong University of Science and Technology. Retrieved from http://repository.ust.hk/ir/Record/1783.1-88939 ; https://doi.org/10.14711/thesis-991012532267203412 ; http://repository.ust.hk/ir/bitstream/1783.1-88939/1/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):

Sui, Wenshu. “Design, fabrication and packaging of capacitive MEMS microphone using MEMS foundry.” 2017. Thesis, Hong Kong University of Science and Technology. Accessed January 24, 2021. http://repository.ust.hk/ir/Record/1783.1-88939 ; https://doi.org/10.14711/thesis-991012532267203412 ; http://repository.ust.hk/ir/bitstream/1783.1-88939/1/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):

Sui, Wenshu. “Design, fabrication and packaging of capacitive MEMS microphone using MEMS foundry.” 2017. Web. 24 Jan 2021.

Vancouver:

Sui W. Design, fabrication and packaging of capacitive MEMS microphone using MEMS foundry. [Internet] [Thesis]. Hong Kong University of Science and Technology; 2017. [cited 2021 Jan 24]. Available from: http://repository.ust.hk/ir/Record/1783.1-88939 ; https://doi.org/10.14711/thesis-991012532267203412 ; http://repository.ust.hk/ir/bitstream/1783.1-88939/1/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:

Sui W. Design, fabrication and packaging of capacitive MEMS microphone using MEMS foundry. [Thesis]. Hong Kong University of Science and Technology; 2017. Available from: http://repository.ust.hk/ir/Record/1783.1-88939 ; https://doi.org/10.14711/thesis-991012532267203412 ; http://repository.ust.hk/ir/bitstream/1783.1-88939/1/th_redirect.html

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

Massey University

3. Lofroth, Matthew. Development of a compliant micro gripper : a thesis submitted in partial fulfillment for the degree of Masters of Engineering in the School of Engineering and Advanced Technology, Massey University .

Degree: 2019, Massey University

URL: http://hdl.handle.net/10179/15437

► Manipulating micro objects simply and effectively has been a widely discussed and challenging task in recent literature for many reasons. Limitations in complex micro fabrication… (more)

▼ Manipulating micro objects simply and effectively has been a widely discussed and challenging task in recent literature for many reasons. Limitations in complex micro fabrication techniques mean creating extremely small tools at the micro scale is very difficult. Adhesion forces also dominate at this scale, causing anything and everything to stick together. This means that even when these tiny structures are created and introduced to the micro world, they quickly become polluted with contaminants and struggle to pick and place particles without said particle adhering to the tool. Indirect methods for micro manipulation exist, however these can be damaging to biological material such as cells, due to unseen forces being focused into a small point. Having the ability to safely manipulate and separate these objects from a culture is crucial to understanding their individual characteristics. Therefore a safe and reliable method for micro manipulation needs to be developed. This project focuses on investigating the current methods used for micro manipulation in order to identify any possible routes towards developing a simple and yet effective means for manipulating micro objects. A modular micro gripping mechanism is proposed in this report, capable of manipulating many different types of objects such as spherical, non spherical or other arbitrary shapes. The proposed micro gripper combines traditional machining techniques with a complex micro fabrication process to produce a modular mechanism consisting of a sturdy, compliant aluminium base in which replaceable silicon and borosilicate glass end effectors are attached. This creates an easily customisable solution for micro manipulation with an array of different micro tips for different applications. A kinematic analysis for the gripper has been provided which predicts the workspace of the gripper given an input actuation. Design parameters of the gripper have also been optimised through various techniques such as FEA (finite element analysis) simulation and the effects of altering individual flexure beam lengths. The gripper is operated by a piezo actuator with a total capable expansion of 19 mm when 150 VDC is applied. This expansion is then amplified by a factor of 8.1 to a maximum tip displacement of approximately 154 mm. Displacement amplification is achieved by incorporating bridge and lever amplifying techniques into the compliant design. The complete micro gripper is then used to demonstrate manipulation tasks on several different target object types including silica micro beads (spherical and non spherical), a human eyelash and a grain of pollen. These tests are performed to investigate the effect of adhesion forces and also to demonstrate the large size range of capable pick and place objects (6 mm to 500 mm).

Subjects/Keywords: Manipulators (Mechanism); Microelectromechanical systems; Design and construction

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APA (6^th Edition):

Lofroth, M. (2019). Development of a compliant micro gripper : a thesis submitted in partial fulfillment for the degree of Masters of Engineering in the School of Engineering and Advanced Technology, Massey University . (Thesis). Massey University. Retrieved from http://hdl.handle.net/10179/15437

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):

Lofroth, Matthew. “Development of a compliant micro gripper : a thesis submitted in partial fulfillment for the degree of Masters of Engineering in the School of Engineering and Advanced Technology, Massey University .” 2019. Thesis, Massey University. Accessed January 24, 2021. http://hdl.handle.net/10179/15437.

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

MLA Handbook (7^th Edition):

Lofroth, Matthew. “Development of a compliant micro gripper : a thesis submitted in partial fulfillment for the degree of Masters of Engineering in the School of Engineering and Advanced Technology, Massey University .” 2019. Web. 24 Jan 2021.

Vancouver:

Lofroth M. Development of a compliant micro gripper : a thesis submitted in partial fulfillment for the degree of Masters of Engineering in the School of Engineering and Advanced Technology, Massey University . [Internet] [Thesis]. Massey University; 2019. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/10179/15437.

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

Council of Science Editors:

Lofroth M. Development of a compliant micro gripper : a thesis submitted in partial fulfillment for the degree of Masters of Engineering in the School of Engineering and Advanced Technology, Massey University . [Thesis]. Massey University; 2019. Available from: http://hdl.handle.net/10179/15437

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

Ryerson University

4. [No author]. FPCB Actuator Driven Micromirror Based Availability Indicator and Laser Pattern Pointer.

Degree: 2015, Ryerson University

URL: https://digital.library.ryerson.ca/islandora/object/RULA%3A5718

► The thesis presents a FPCB (Flexible Printed Circuit Board) actuator driven micromirror and the laser pattern generating technology for availability indicator and laser pattern pointer.… (more)

Subjects/Keywords: Microelectromechanical systems – Micromachining; Mirrors – Design; Microelectromechanical systems – Design and construction; Flexible printed circuits – Design and construction

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APA (6^th Edition):

author], [. (2015). FPCB Actuator Driven Micromirror Based Availability Indicator and Laser Pattern Pointer. (Thesis). Ryerson University. Retrieved from https://digital.library.ryerson.ca/islandora/object/RULA%3A5718

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):

author], [No. “FPCB Actuator Driven Micromirror Based Availability Indicator and Laser Pattern Pointer.” 2015. Thesis, Ryerson University. Accessed January 24, 2021. https://digital.library.ryerson.ca/islandora/object/RULA%3A5718.

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

MLA Handbook (7^th Edition):

author], [No. “FPCB Actuator Driven Micromirror Based Availability Indicator and Laser Pattern Pointer.” 2015. Web. 24 Jan 2021.

Vancouver:

author] [. FPCB Actuator Driven Micromirror Based Availability Indicator and Laser Pattern Pointer. [Internet] [Thesis]. Ryerson University; 2015. [cited 2021 Jan 24]. Available from: https://digital.library.ryerson.ca/islandora/object/RULA%3A5718.

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

Council of Science Editors:

author] [. FPCB Actuator Driven Micromirror Based Availability Indicator and Laser Pattern Pointer. [Thesis]. Ryerson University; 2015. Available from: https://digital.library.ryerson.ca/islandora/object/RULA%3A5718

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

Ryerson University

5. Xue, Yuan. Development of a novel automated micro-assembly mechanism.

Degree: 2011, Ryerson University

URL: https://digital.library.ryerson.ca/islandora/object/RULA%3A928

► In this thesis a novel automated micro assembly mechanism is developed. The assembly mechanism utilizes repulsive-force actuators to flip surface-micromachined 2D structures out-of-plane and assemble… (more)

Subjects/Keywords: Microelectromechanical systems – Design and construction; Microfabrication; Mirrors – Industrial applications; Acceleration (Mechanics)

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APA (6^th Edition):

Xue, Y. (2011). Development of a novel automated micro-assembly mechanism. (Thesis). Ryerson University. Retrieved from https://digital.library.ryerson.ca/islandora/object/RULA%3A928

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):

Xue, Yuan. “Development of a novel automated micro-assembly mechanism.” 2011. Thesis, Ryerson University. Accessed January 24, 2021. https://digital.library.ryerson.ca/islandora/object/RULA%3A928.

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

MLA Handbook (7^th Edition):

Xue, Yuan. “Development of a novel automated micro-assembly mechanism.” 2011. Web. 24 Jan 2021.

Vancouver:

Xue Y. Development of a novel automated micro-assembly mechanism. [Internet] [Thesis]. Ryerson University; 2011. [cited 2021 Jan 24]. Available from: https://digital.library.ryerson.ca/islandora/object/RULA%3A928.

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

Council of Science Editors:

Xue Y. Development of a novel automated micro-assembly mechanism. [Thesis]. Ryerson University; 2011. Available from: https://digital.library.ryerson.ca/islandora/object/RULA%3A928

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

Oregon State University

6. Park, Sang-Bin. The use of electrochemical micromachining for making a microfloat valve.

Degree: MS, Industrial Engineering, 1999, Oregon State University

URL: http://hdl.handle.net/1957/33164

► Micromanufacturing consists of processes for producing structures, devices or systems with feature sizes measured in micrometers. Micromanufacturing began in the mid-1960's with microelectronics fabrication technology.… (more)

▼ Micromanufacturing consists of processes for producing structures, devices or systems with feature sizes measured in micrometers. Micromanufacturing began in the mid-1960's with microelectronics fabrication technology. In the 1980's, Micro-Electro-Mechanical Systems (MEMS) began to be developed, in which electrical and mechanical subsystems were integrated at small scales. More recently, Microtechnology-based Energy and Chemical Systems (MECS) have been developed that have led to improved heat and mass transfer in energy and chemical systems. At Oregon State University, new methods to fabricate MECS have been developed. One of the new methods involves microlamination – bonding thin strips of different materials together. This method has generated a high volume and low-cost approach to the production of high-aspect-ratio (height-to-width) structures. Past efforts to make microfloat valves using microlamination methods resulted in an 11:1 diodicity ratio. It was hypothesized that the valve had a ridge of redeposited material around the valve seat caused by the condensation and deposition of ablation ejecta during laser machining. The contribution of this thesis is the creation of a microfloat valve using an Electrochemical Micromachining (EMM) method. EMM methods are known to produce smooth surfaces, free of burrs or any other types of aspirates. Therefore, it was hypothesized that float valves made with EMM methods would improve valve performance. Four steps were involved in the creation of the microfloat valve: lamina formation, laminae registration, laminae bonding and component dissociation. A total of 9 laminae-some of which were made with 304 stainless steel 76.2 μm thick, others of which were made with 50.8 μm thick polyimide-made up the microfloat valve. Photolithography and EMM were used to form the lamina. Even though the laminae created by EMM were smaller in size than desired, the machined areas did not have redeposited material, and some areas had straight walls. In laminae registration, a two edge registration method was used. In the laminae bonding step, laminae were bonded by the adhesive method at 248°C under 135 kPa pressure for 13.5 minutes. In the component dissociation step, a capacitor dissociation method that was designed at OSU was used. Upon performance testing, the average diodicity ratio for the EMM valve was 12.45 over the range 0 kPa-450 kPa, indicating improved performance when compared to the Laser Ablation valve-which had an average 11.17 over the range 0 kPa-100 kPa. Microscope examination of valves revealed that statistically significant improvement in valve performance would require refinement of component dissociation methods. Advisors/Committee Members: Paul, Brian K. (advisor), Wilson, Rick (committee member).

Subjects/Keywords: Microelectromechanical systems – Design and construction

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APA (6^th Edition):

Park, S. (1999). The use of electrochemical micromachining for making a microfloat valve. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/33164

Chicago Manual of Style (16^th Edition):

Park, Sang-Bin. “The use of electrochemical micromachining for making a microfloat valve.” 1999. Masters Thesis, Oregon State University. Accessed January 24, 2021. http://hdl.handle.net/1957/33164.

MLA Handbook (7^th Edition):

Park, Sang-Bin. “The use of electrochemical micromachining for making a microfloat valve.” 1999. Web. 24 Jan 2021.

Vancouver:

Park S. The use of electrochemical micromachining for making a microfloat valve. [Internet] [Masters thesis]. Oregon State University; 1999. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/1957/33164.

Council of Science Editors:

Park S. The use of electrochemical micromachining for making a microfloat valve. [Masters Thesis]. Oregon State University; 1999. Available from: http://hdl.handle.net/1957/33164

Drexel University

7. Hamid, Qudus. Combining fabrication and surface modification techniques to develop cell-laden microfluidic devices.

Degree: 2014, Drexel University

URL: http://hdl.handle.net/1860/4542

►

Micro-Electro-Mechanical Systems (MEMS) technologies illustrate the potential for many applications in the field of tissue engineering, regenerative medicine, and life sciences. The fabrication of tissue… (more)

▼

Micro-Electro-Mechanical Systems (MEMS) technologies illustrate the potential for many applications in the field of tissue engineering, regenerative medicine, and life sciences. The fabrication of tissue models integrates the multidisciplinary field of life sciences and engineering. Presently, monolayer cell cultures are frequently used to investigate potential anti-cancer agents. These monolayer cultures give limited feedback on the effects of the micro-environment. A micro-environment, which mimics that of the target tissue, will eliminate the limitations of the traditional mainstays of tissue research. The fabrication of such micro-environment requires a thorough investigation of the actual target organ and/or tissue. Microfabrication techniques are utilized to develop microfluidic channels for continuous nutrition supply to cells inside a micro-environment. The ability of cells to build tissues and maintain tissue-specific functions depends on the interaction between cells and the extracellular matrix (ECM). Three-dimensional tissue platforms are rapidly becoming the method of choice for quantification of the heterogeneity of cell populations for many diagnostic and drug therapy applications. Microfluidic sensors and the integration of sensors with microfluidic systems are often described as miniature versions of their macro-scale counterparts. This technology presents unique advantages for handling costly and difficult-to-obtain samples and reagents as a typical system requires between 100 nL to 10µL of working fluid. The fabrication of a fully functional cell-based biosensor utilizes both biological patterning and microfabrication techniques. SU-8 is a popular photosensitive epoxy-based polymer in MEMS. The patterning of bare SU-8 alone does not provide the appropriate ECM necessary to develop microsystems for biological applications. Manipulating the chemical composition of SU-8 will enhance the biological compatibility, giving the fabricated constructs the appropriate ECM needed to promote a functional tissue array. The objective of this research is to investigate the integration of maskless fabrication, direct cell deposition, and surface modification techniques to engineer cell-laden microfluidics. This thesis presents advances in additive manufacturing techniques, the utilization of plasma chemistry to enhance surface functionalization, and manipulation of photo-polymerization to investigate new approaches to assemble cell-laden microfluidics.

Ph.D., Mechanical Engineering and Mechanics – Drexel University, 2014

Advisors/Committee Members: Sun, Wei 1957 April 17-, College of Engineering.

Subjects/Keywords: Mechanical engineering; Microelectromechanical systems – Design and construction; Tissue engineering – Research

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APA (6^th Edition):

Hamid, Q. (2014). Combining fabrication and surface modification techniques to develop cell-laden microfluidic devices. (Thesis). Drexel University. Retrieved from http://hdl.handle.net/1860/4542

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):

Hamid, Qudus. “Combining fabrication and surface modification techniques to develop cell-laden microfluidic devices.” 2014. Thesis, Drexel University. Accessed January 24, 2021. http://hdl.handle.net/1860/4542.

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

MLA Handbook (7^th Edition):

Hamid, Qudus. “Combining fabrication and surface modification techniques to develop cell-laden microfluidic devices.” 2014. Web. 24 Jan 2021.

Vancouver:

Hamid Q. Combining fabrication and surface modification techniques to develop cell-laden microfluidic devices. [Internet] [Thesis]. Drexel University; 2014. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/1860/4542.

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

Council of Science Editors:

Hamid Q. Combining fabrication and surface modification techniques to develop cell-laden microfluidic devices. [Thesis]. Drexel University; 2014. Available from: http://hdl.handle.net/1860/4542

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

Oregon State University

8. Urval, Roshan. CAE-based process designing of powder injection molding for thin-walled micro-fluidic device components.

Degree: MS, Industrial Engineering, 2004, Oregon State University

URL: http://hdl.handle.net/1957/31158

► Powder injection molding (PIM) is a net fabrication technique that combines the complex shape-forming ability of plastic injection molding, the precision of die-casting, and the… (more)

▼ Powder injection molding (PIM) is a net fabrication technique that combines the complex shape-forming ability of plastic injection molding, the precision of die-casting, and the material selection flexibility of powder metallurgy. For this study, the design issues related to PIM for fabrication of thin-walled high-aspect ratio geometries were investigated. These types of geometries are typical to the field of microtechnology-based energy and chemical systems (MECS). MECS are multi-scale (sizes in at least two or more different length scale regimes) fluidic devices working on the principle of heat and mass transfer through embedded micro and nanoscale features. Stainless steel was the material chosen for the investigations because of its high-thermal resistance and chemical inertness necessary for typical microfluidic applications. The investigations for the study were performed using the state-of-the-art computer aided engineering (CAE) design tool, PIMSolver®. The effect of reducing part thickness, on the process parameters including melt temperature, mold temperature, fill time and switch over position, during the mold-filling stage of the injection molding cycle were investigated. The design of experiments was conducted using the Taguchi method. It was seen that the process variability generally increased with reduction in thickness. Mold temperature played the most significant role in controlling the mold filling behavior as the part thickness reduced. The effects of reducing part thickness, process parameters, microscale surface geometry and delivery system design on the occurrence of defects like short shots were also studied. The operating range, in which the mold cavity was completely filled, was greatly reduced as the part thickness was reduced. The single edge gated delivery system designs, with single or branched runners, resulted in a completely formed part. The presence of microchannel features on the part surface increased the possibility of formation of defects like short shots and weld-lines when compared to a featureless part. The study explored some typical micro-fluidic geometries for fabrication using PIM. The final aspect of this study was the PIM experiments performed using a commercial stainless steel feedstock. Experiments were performed to study the mold-filling behavior of a thin, high aspect ratio part and also to study the effect of varying processing conditions on the mold-filling behavior. These experiments also provided correspondence to the mold filling behavior simulated using PIMSolver®. The PIMSolver® closely predicted the mold-filling patterns as seen in the experiments performed under similar molding conditions. The study was successful in laying down a quantitative framework for using PIM to fabricate micro-fluidic devices. Advisors/Committee Members: Atre, Sundar V. (advisor), Jovanovich, Goran (committee member).

Subjects/Keywords: Microelectromechanical systems – Design and construction

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APA (6^th Edition):

Urval, R. (2004). CAE-based process designing of powder injection molding for thin-walled micro-fluidic device components. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/31158

Chicago Manual of Style (16^th Edition):

Urval, Roshan. “CAE-based process designing of powder injection molding for thin-walled micro-fluidic device components.” 2004. Masters Thesis, Oregon State University. Accessed January 24, 2021. http://hdl.handle.net/1957/31158.

MLA Handbook (7^th Edition):

Urval, Roshan. “CAE-based process designing of powder injection molding for thin-walled micro-fluidic device components.” 2004. Web. 24 Jan 2021.

Vancouver:

Urval R. CAE-based process designing of powder injection molding for thin-walled micro-fluidic device components. [Internet] [Masters thesis]. Oregon State University; 2004. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/1957/31158.

Council of Science Editors:

Urval R. CAE-based process designing of powder injection molding for thin-walled micro-fluidic device components. [Masters Thesis]. Oregon State University; 2004. Available from: http://hdl.handle.net/1957/31158

Oregon State University

9. Terhaar, Tyson J. Comparison of two microvalve designs fabricated in mild steel using microprojection welding and capacitive dissociation.

Degree: MS, Industrial Engineering, 1998, Oregon State University

URL: http://hdl.handle.net/1957/34138

► Since the dawn of the computer age, there has been a push to create miniature devices. These devices were initially integrated circuit (IC) devices to… (more)

▼ Since the dawn of the computer age, there has been a push to create miniature devices. These devices were initially integrated circuit (IC) devices to perform calculations for computers. As the technology progressed, the scope of the devices diverged to included microelectromechanical (MEMS) devices, meaning that the devices perform mechanical movements via electrical actuation. More recently, a new generation of devices has evolved called microtechnology-based energy and chemical systems (MECS). MECS may employ MEMS technology, however the systems are not designed to produce only mechanical movement. MECS deal with heat and mass transfer, the basic processes used in energy, chemical and biological systems, in the mesoscale realm. Mesoscale devices range from the size of a sugar cube to the size of a human fist. The possibilities of MECS have not been realized. Heating and cooling systems, chemical mixing/distribution, and locking systems are all potential applications. The devices require: 1) revolutionary design, accounting for the scaling effects on device performance; 2) new fabrication technologies for the creation of these designs; and 3) good material properties for mechanical and chemical interactions. Fabrication requirements for MECS are different than for MEMS in that MECS generally require non-silicon metals. Metal microlamination (MML) has been introduced as a general practice for meeting the fabrication requirements for MECS. Prior MML fabrication methods have emphasized the use of diffusion bonding, soldering, or brazing techniques. This thesis will introduce: 1) a novel microflapper valve design fabricated in mild steel using a novel microprojection welding technique; 2) a novel microfloat valve design fabricated in mild steel using a novel capacitive dissociation process for creating free floating geometries. The devices are characterized by comparing actual flow rates to theoretical flow rates of equivalent orifice sizes. Preliminary results show that the microfloat valve achieved an average diodicity (free flow versus leakage rate) ratio of 11.19, while the microflapper valve achieved an average diodicity ratio of 4.08. The theoretical orifice sizes of the microfloat and microflapper valves are 0.629 mm and 0.611 mm respectively. These results suggest that the float valve is the superior design. Advisors/Committee Members: Paul, Brian K. (advisor), Brown, Terry (committee member).

Subjects/Keywords: Microelectromechanical systems – Design and construction

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APA (6^th Edition):

Terhaar, T. J. (1998). Comparison of two microvalve designs fabricated in mild steel using microprojection welding and capacitive dissociation. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/34138

Chicago Manual of Style (16^th Edition):

Terhaar, Tyson J. “Comparison of two microvalve designs fabricated in mild steel using microprojection welding and capacitive dissociation.” 1998. Masters Thesis, Oregon State University. Accessed January 24, 2021. http://hdl.handle.net/1957/34138.

MLA Handbook (7^th Edition):

Terhaar, Tyson J. “Comparison of two microvalve designs fabricated in mild steel using microprojection welding and capacitive dissociation.” 1998. Web. 24 Jan 2021.

Vancouver:

Terhaar TJ. Comparison of two microvalve designs fabricated in mild steel using microprojection welding and capacitive dissociation. [Internet] [Masters thesis]. Oregon State University; 1998. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/1957/34138.

Council of Science Editors:

Terhaar TJ. Comparison of two microvalve designs fabricated in mild steel using microprojection welding and capacitive dissociation. [Masters Thesis]. Oregon State University; 1998. Available from: http://hdl.handle.net/1957/34138

Hong Kong University of Science and Technology

10. Zhou, Zhijian. High frequency MEMS sensor for aero-acoustic measurements.

Degree: 2013, Hong Kong University of Science and Technology

URL: http://repository.ust.hk/ir/Record/1783.1-7890 ; https://doi.org/10.14711/thesis-b1214709 ; http://repository.ust.hk/ir/bitstream/1783.1-7890/1/th_redirect.html

► Aero-acoustics, a branch of acoustics which studies noise generation via either turbulent fluid motion or aerodynamic forces interacting with surfaces, is a growing area and… (more)

▼ Aero-acoustics, a branch of acoustics which studies noise generation via either turbulent fluid motion or aerodynamic forces interacting with surfaces, is a growing area and has received fresh emphasis due to advances in air, ground and space transportation. While tests of a real object are possible, the setup is usually complicated and the results are easily corrupted by the ambient noise. Consequently, testing in relatively tightly-controlled laboratory settings using scaled models with reduced dimensions is preferred. However, when the dimensions are reduced by a factor of M, the amplitude and the bandwidth of the corresponding acoustic waves are increased by 10logM in decibels and M, respectively. Therefore microphones with a bandwidth of several hundreds of kHz and a dynamic range covering 40Pa to 4kPa are needed for aero-acoustic measurements. Micro-Electro-Mechanical-system (MEMS) microphones have been investigated for more than twenty years, and recently, the semiconductor industry has put more and more concentration on this area. Compared with all other working principles, due to their scaling characteristic, piezoresistive type microphones can achieve a higher sensitivity bandwidth (SBW) product, and in turn they are well suited for aero-acoustic measurements. In this thesis, two metal-induced-lateral-crystallized (MILC) polycrystalline silicon (poly-Si) based piezoresistive type MEMS microphones are designed and fabricated using surface micromachining and bulk micromachining techniques, respectively. These microphones are calibrated using an electrical spark generated shockwave (N-wave) source. For the surface micromachined sample, the measured static sensitivity is 0.4μV/V/Pa, dynamic sensitivity is 0.033μV/V/Pa and the frequency range starts from 100kHz with a first mode resonant frequency of 400kHz. For the bulk micromachined sample, the measured static sensitivity is 0.28μV/V/Pa, dynamic sensitivity is 0.33μV/V/Pa and the frequency range starts from 6kHz with a first mode resonant frequency of 715kHz.

Subjects/Keywords: Microphone ; Aeroacoustics ; Measurement ; Microelectromechanical systems ; Design and construction

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APA (6^th Edition):

Zhou, Z. (2013). High frequency MEMS sensor for aero-acoustic measurements. (Thesis). Hong Kong University of Science and Technology. Retrieved from http://repository.ust.hk/ir/Record/1783.1-7890 ; https://doi.org/10.14711/thesis-b1214709 ; http://repository.ust.hk/ir/bitstream/1783.1-7890/1/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):

Zhou, Zhijian. “High frequency MEMS sensor for aero-acoustic measurements.” 2013. Thesis, Hong Kong University of Science and Technology. Accessed January 24, 2021. http://repository.ust.hk/ir/Record/1783.1-7890 ; https://doi.org/10.14711/thesis-b1214709 ; http://repository.ust.hk/ir/bitstream/1783.1-7890/1/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):

Zhou, Zhijian. “High frequency MEMS sensor for aero-acoustic measurements.” 2013. Web. 24 Jan 2021.

Vancouver:

Zhou Z. High frequency MEMS sensor for aero-acoustic measurements. [Internet] [Thesis]. Hong Kong University of Science and Technology; 2013. [cited 2021 Jan 24]. Available from: http://repository.ust.hk/ir/Record/1783.1-7890 ; https://doi.org/10.14711/thesis-b1214709 ; http://repository.ust.hk/ir/bitstream/1783.1-7890/1/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:

Zhou Z. High frequency MEMS sensor for aero-acoustic measurements. [Thesis]. Hong Kong University of Science and Technology; 2013. Available from: http://repository.ust.hk/ir/Record/1783.1-7890 ; https://doi.org/10.14711/thesis-b1214709 ; http://repository.ust.hk/ir/bitstream/1783.1-7890/1/th_redirect.html

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

Hong Kong University of Science and Technology

11. Ramanan, Aditya. Design and characterisation of a microresonator with enhanced damping.

Degree: 2016, Hong Kong University of Science and Technology

URL: http://repository.ust.hk/ir/Record/1783.1-86343 ; https://doi.org/10.14711/thesis-b1590161

► Advances in microfabrication technologies has changed the way society functions, giving rise to the microelectronics and the digital age we live in. Microresonators are a… (more)

▼ Advances in microfabrication technologies has changed the way society functions, giving rise to the microelectronics and the digital age we live in. Microresonators are a popular micro electro mechanical system (MEMS) used in many applications such as gyroscopes, oscillators and many micro sensors. They are structures that vibrate upon the application of a force at its resonant frequency. Their performance is characterized by a non-dimensional parameter known as the quality factor which is defined as the ratio of the input energy to the energy lost over one period of vibration. Among all the loss mechanisms, air damping, which is caused by constant collisions between air molecules and the resonator, dominates when the resonator vibrates in air or even in a low vacuum environment. For many applications, damping is a hindrance which people try to mitigate by operating in a high vacuum or by changing the structural design. For others, such as pressure sensing based on air damping, enhanced damping is however desirable as it could potentially increase the sensing range. Regardless of the objective, it is an area where research could be beneficial. In this thesis air damping in microresonators is explored and the impact of using a different shape such as a curved one instead of the standard parallel plate is studied. A 3D Monte Carlo simulation is performed to simulate the damping in the curved and straight structures following which a practical design is created to experimentally validate the effect suggested by the simulations. The devices are fabricated and tested both optically and electronically. A two-node driving and detection scheme is used owing to its simplicity and the signal output is used to obtain the quality factor of the various resonators fabricated. Preliminary results suggest that curved structures do indeed enhance the damping when compared to parallel plates that have the same number molecules entering the squeeze film domain. The difference can be as high as twice that of its equivalent straight structures, indicating the curved plates could be a viable design for damping enhancement.

Subjects/Keywords: Microresonators (Optoelectronics) ; Design and construction ; Microelectromechanical systems ; Damping (Mechanics)

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APA (6^th Edition):

Ramanan, A. (2016). Design and characterisation of a microresonator with enhanced damping. (Thesis). Hong Kong University of Science and Technology. Retrieved from http://repository.ust.hk/ir/Record/1783.1-86343 ; https://doi.org/10.14711/thesis-b1590161

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):

Ramanan, Aditya. “Design and characterisation of a microresonator with enhanced damping.” 2016. Thesis, Hong Kong University of Science and Technology. Accessed January 24, 2021. http://repository.ust.hk/ir/Record/1783.1-86343 ; https://doi.org/10.14711/thesis-b1590161.

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

MLA Handbook (7^th Edition):

Ramanan, Aditya. “Design and characterisation of a microresonator with enhanced damping.” 2016. Web. 24 Jan 2021.

Vancouver:

Ramanan A. Design and characterisation of a microresonator with enhanced damping. [Internet] [Thesis]. Hong Kong University of Science and Technology; 2016. [cited 2021 Jan 24]. Available from: http://repository.ust.hk/ir/Record/1783.1-86343 ; https://doi.org/10.14711/thesis-b1590161.

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

Council of Science Editors:

Ramanan A. Design and characterisation of a microresonator with enhanced damping. [Thesis]. Hong Kong University of Science and Technology; 2016. Available from: http://repository.ust.hk/ir/Record/1783.1-86343 ; https://doi.org/10.14711/thesis-b1590161

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

Hong Kong University of Science and Technology

12. Miao, Zhuonan. Design and fabrication of micro flow sensors using CMOS-MEMS technology.

Degree: 2013, Hong Kong University of Science and Technology

URL: http://repository.ust.hk/ir/Record/1783.1-92665 ; https://doi.org/10.14711/thesis-b1255622 ; http://repository.ust.hk/ir/bitstream/1783.1-92665/1/th_redirect.html

► Energy-efficient building (EEB) is becoming increasingly important in tackling energy shortage issue. However, the market adoption of EEB is hindered by the high cost of… (more)

Subjects/Keywords: Detectors ; Design and construction ; Microelectromechanical systems ; Metal oxide semiconductors, Complementary

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

APA (6^th Edition):

Miao, Z. (2013). Design and fabrication of micro flow sensors using CMOS-MEMS technology. (Thesis). Hong Kong University of Science and Technology. Retrieved from http://repository.ust.hk/ir/Record/1783.1-92665 ; https://doi.org/10.14711/thesis-b1255622 ; http://repository.ust.hk/ir/bitstream/1783.1-92665/1/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):

Miao, Zhuonan. “Design and fabrication of micro flow sensors using CMOS-MEMS technology.” 2013. Thesis, Hong Kong University of Science and Technology. Accessed January 24, 2021. http://repository.ust.hk/ir/Record/1783.1-92665 ; https://doi.org/10.14711/thesis-b1255622 ; http://repository.ust.hk/ir/bitstream/1783.1-92665/1/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):

Miao, Zhuonan. “Design and fabrication of micro flow sensors using CMOS-MEMS technology.” 2013. Web. 24 Jan 2021.

Vancouver:

Miao Z. Design and fabrication of micro flow sensors using CMOS-MEMS technology. [Internet] [Thesis]. Hong Kong University of Science and Technology; 2013. [cited 2021 Jan 24]. Available from: http://repository.ust.hk/ir/Record/1783.1-92665 ; https://doi.org/10.14711/thesis-b1255622 ; http://repository.ust.hk/ir/bitstream/1783.1-92665/1/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:

Miao Z. Design and fabrication of micro flow sensors using CMOS-MEMS technology. [Thesis]. Hong Kong University of Science and Technology; 2013. Available from: http://repository.ust.hk/ir/Record/1783.1-92665 ; https://doi.org/10.14711/thesis-b1255622 ; http://repository.ust.hk/ir/bitstream/1783.1-92665/1/th_redirect.html

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

Hong Kong University of Science and Technology

13. Xu, Wei MAE. Micromachined thermal flow sensor based on CMOS MEMS technology.

Degree: 2017, Hong Kong University of Science and Technology

URL: http://repository.ust.hk/ir/Record/1783.1-104968 ; https://doi.org/10.14711/thesis-991012532159503412 ; http://repository.ust.hk/ir/bitstream/1783.1-104968/1/th_redirect.html

► Flow measurement has been an essential requirement in many commercial and industrial applications; one of the urgent needs is the low-power flow-sensing node for the… (more)

▼ Flow measurement has been an essential requirement in many commercial and industrial applications; one of the urgent needs is the low-power flow-sensing node for the Internet of Things (IoT) in the smart Energy-efficient Building (EeB). With the mature CMOS fabrication techniques, the low-cost MEMS flow devices combined with the highly integrated circuits (ICs) and micro mechanical components are able to be carried out. In particular, the target of this thesis, thermal flow sensors do not require any moving parts that make them perhaps the easiest flow devices to be implemented in the CMOS process due to the structural and electronic simplicity. This thesis mainly focuses on the systematic design and fabrication of the low-cost micromachined calorimetric flow sensors by using the CMOS-MEMS technology. Primarily, a unified design platform with the theoretical modeling and simulation was proposed to get a comprehensive deep study of the thermoresistive micro calorimetric flow (TMCF) sensor system. Wherein, a general 1D model of TMCF sensor for two types of packaging: the open-space type and the channel type was proposed. Besides, the equivalent circuit model (ECM) for the TMCF sensor system was built and validated. This proposed unified design platform could be effectively applied in the design and optimization of CMOS TMCF sensor system. Accordingly, two batches of TMCF sensors were successfully designed and fabricated with the commercial CMOS MEMS technology, respectively. The batch of monolithically integrated TMCF sensors was fabricated by using a 0.35μm 2P4M CMOS MEMS process. The fabricated TMCF sensors achieved a highest normalized sensitivity of 230mV/(m/s)/mW with the bidirectional flow detection of nitrogen (-11 ~ 11 m/s), which was two orders of magnitude higher than the previous CMOS flow sensors. Besides, the responses of TMCF sensors predicted by the 1D model and CFD model were in good agreement with the experimental data. Remarkably, an advanced T²MCF sensor was achieved, where the common issue of inconsistent output in the thermal flow sensor due to the variation of ambient temperature T_a was compensated and minimized. The T²MCF sensor showed the excellent temperature insensitive output with the maximum normalized variation of 0.5% under the different T_a of 22°C ~ 48°C. Compared to the uncompensated counterpart (49%), the measuring accuracy and stability of T²MCF sensor were greatly improved. Furthermore, a flow regime map (protrusion d* vs. reduced chip Reynolds number Re*) under different channel aspect ratio Ar was constructed to serve as a useful guideline for designing a well-packaged, reliable and accurate TMCF sensor system. Another wafer-level encapsulated TMCF sensors was designed and fabricated by using the proprietary InvenSense CMOS MEMS technology. Thereinto, the fabricated Mo TMCF sensor with the pulsed operated CTD mode achieved an excellent normalized sensitivity of 112.4μV/(m/s)/mW with the bidirectional detection of nitrogen flow…

Subjects/Keywords: Detectors ; Design and construction ; Metal oxide semiconductors, Complementary ; Microelectromechanical systems

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

APA (6^th Edition):

Xu, W. M. (2017). Micromachined thermal flow sensor based on CMOS MEMS technology. (Thesis). Hong Kong University of Science and Technology. Retrieved from http://repository.ust.hk/ir/Record/1783.1-104968 ; https://doi.org/10.14711/thesis-991012532159503412 ; http://repository.ust.hk/ir/bitstream/1783.1-104968/1/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):

Xu, Wei MAE. “Micromachined thermal flow sensor based on CMOS MEMS technology.” 2017. Thesis, Hong Kong University of Science and Technology. Accessed January 24, 2021. http://repository.ust.hk/ir/Record/1783.1-104968 ; https://doi.org/10.14711/thesis-991012532159503412 ; http://repository.ust.hk/ir/bitstream/1783.1-104968/1/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):

Xu, Wei MAE. “Micromachined thermal flow sensor based on CMOS MEMS technology.” 2017. Web. 24 Jan 2021.

Vancouver:

Xu WM. Micromachined thermal flow sensor based on CMOS MEMS technology. [Internet] [Thesis]. Hong Kong University of Science and Technology; 2017. [cited 2021 Jan 24]. Available from: http://repository.ust.hk/ir/Record/1783.1-104968 ; https://doi.org/10.14711/thesis-991012532159503412 ; http://repository.ust.hk/ir/bitstream/1783.1-104968/1/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:

Xu WM. Micromachined thermal flow sensor based on CMOS MEMS technology. [Thesis]. Hong Kong University of Science and Technology; 2017. Available from: http://repository.ust.hk/ir/Record/1783.1-104968 ; https://doi.org/10.14711/thesis-991012532159503412 ; http://repository.ust.hk/ir/bitstream/1783.1-104968/1/th_redirect.html

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

Cape Peninsula University of Technology

14. Zhang, Rui. Mechanics of micromachined bridge-type accelerometer .

Degree: 2005, Cape Peninsula University of Technology

URL: http://etd.cput.ac.za/handle/20.500.11838/1285

► Having simple structure and high sensitivity, micro accelerometer is a type of popular transducer used to measure the acceleration in a great variety of conditions.… (more)

Subjects/Keywords: Microelectromechanical systems – Design and construction; Accelerometers – Design and construction

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

APA (6^th Edition):

Zhang, R. (2005). Mechanics of micromachined bridge-type accelerometer . (Thesis). Cape Peninsula University of Technology. Retrieved from http://etd.cput.ac.za/handle/20.500.11838/1285

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):

Zhang, Rui. “Mechanics of micromachined bridge-type accelerometer .” 2005. Thesis, Cape Peninsula University of Technology. Accessed January 24, 2021. http://etd.cput.ac.za/handle/20.500.11838/1285.

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

MLA Handbook (7^th Edition):

Zhang, Rui. “Mechanics of micromachined bridge-type accelerometer .” 2005. Web. 24 Jan 2021.

Vancouver:

Zhang R. Mechanics of micromachined bridge-type accelerometer . [Internet] [Thesis]. Cape Peninsula University of Technology; 2005. [cited 2021 Jan 24]. Available from: http://etd.cput.ac.za/handle/20.500.11838/1285.

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

Council of Science Editors:

Zhang R. Mechanics of micromachined bridge-type accelerometer . [Thesis]. Cape Peninsula University of Technology; 2005. Available from: http://etd.cput.ac.za/handle/20.500.11838/1285

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

Cape Peninsula University of Technology

15. Wang, Lin. Mechanics of micro capacitive accelerometer with u-shape cantilever beam .

Degree: 2005, Cape Peninsula University of Technology

URL: http://etd.cput.ac.za/handle/20.500.11838/2616

► Due to an increasing in industrial micromation need in recent years, the use of micro accelerometers has been highly increased. Consecutively, this has promoted research… (more)

▼ Due to an increasing in industrial micromation need in recent years, the use of micro accelerometers has been highly increased. Consecutively, this has promoted research activities in this field; capacitive accelerometers also have got high concern at large. As a research project of the Kentron in South Africa, this thesis deals with a theoretical model for a one-dimensional micro capacitive accelerometer with U-shape cantilever beam. The properties of the small angle tilted-plate capacitor have been analyzed; the capacitance equation and electrostatic force equation of this kind capacitor have been derived. The sensing element of this accelerometer consists of an inertial mass connected with two cantilever beams. The vibration modes analysis to the sensing element was accomplished by using CoventorWare2004's MemMech module, the result indicates that the main vibration mode can cause the capacitance change observably and the effect of the other modes to the capacitance can be ignored, which satisfied the purpose of the design. In the process of deriving the linearizing acceleration equation, the angle of the inertial mass caused by the deformation of the U-shape cantilever beam was taken into account as well as the electrostatic force between the two electrodes, thus the more precise acceleration linear equation was obtained. The sensitivity equation was derived through the acceleration linear equation, the relationship between the main parameters of the system and the sensitivity has been analyzed. The differential structure of this micro capacitive accelerometer was also analyzed; the linearizing acceleration equation and sensitivity equation of this kind structure were derived, it has been proven that the sensitivity of this structure is twice than the normal structure approximately. The maximum detectable signal was obtained in terms of the fracture strength of the cantilever beam and the maximum displacement of the inertial mass. The minimum detectable signal was obtained in terms of the thermal noise analysis. In the process of the dynamic analysis, the forced vibration produced by the sinusoidal periodic force and sinusoidal periodic moment was analyzed and the transient capacitance equation was derived, this proved the system has good dynamic character in theory. The system was simulated and analyzed by using CoventorWare2004's Saber module. The initial capacitance analysis indicates the relationship between the voltage and the initial capacitance, the result is close to the analytic model. The resonance frequencies analysis indicates that the main dimensions of the sensing element can determine the resonance frequencies and each vibration mode's sequence, the initial dimensions of the sensing element was proved reasonable by analyzing. Sensitivity analysis and Monte Carlo analysis indicate the effect of the sensing element's normal manufacturing tolerance to the system's frequency is small. Impact of plate curvature analysis indicates the effect of the inertial mass's… Advisors/Committee Members: Sun, Bohua (advisor).

Subjects/Keywords: Microelectromechanical systems – Design and construction; Accelerometers – Design and construction

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

APA (6^th Edition):

Wang, L. (2005). Mechanics of micro capacitive accelerometer with u-shape cantilever beam . (Thesis). Cape Peninsula University of Technology. Retrieved from http://etd.cput.ac.za/handle/20.500.11838/2616

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

Chicago Manual of Style (16^th Edition):

Wang, Lin. “Mechanics of micro capacitive accelerometer with u-shape cantilever beam .” 2005. Thesis, Cape Peninsula University of Technology. Accessed January 24, 2021. http://etd.cput.ac.za/handle/20.500.11838/2616.

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

MLA Handbook (7^th Edition):

Wang, Lin. “Mechanics of micro capacitive accelerometer with u-shape cantilever beam .” 2005. Web. 24 Jan 2021.

Vancouver:

Wang L. Mechanics of micro capacitive accelerometer with u-shape cantilever beam . [Internet] [Thesis]. Cape Peninsula University of Technology; 2005. [cited 2021 Jan 24]. Available from: http://etd.cput.ac.za/handle/20.500.11838/2616.

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

Council of Science Editors:

Wang L. Mechanics of micro capacitive accelerometer with u-shape cantilever beam . [Thesis]. Cape Peninsula University of Technology; 2005. Available from: http://etd.cput.ac.za/handle/20.500.11838/2616

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

Michigan State University

16. Merced, Emmanuell J. Design, fabrication, characterization, and control of VO2-based micro-electro-mechanical actuators.

Degree: 2014, Michigan State University

URL: http://etd.lib.msu.edu/islandora/object/etd:2505

►

Thesis Ph. D. Michigan State University. Electrical Engineering - Doctor of Philosophy 2014.

In this work, a vanadium dioxide (VO2)-based micro-electro-mechanical actuator has been successfully… (more)

Subjects/Keywords: Actuators – Design and construction; Microelectromechanical systems; Vanadium oxide; Control theory; Electrical engineering; Materials Science

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APA (6^th Edition):

Merced, E. J. (2014). Design, fabrication, characterization, and control of VO2-based micro-electro-mechanical actuators. (Thesis). Michigan State University. Retrieved from http://etd.lib.msu.edu/islandora/object/etd:2505

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):

Merced, Emmanuell J. “Design, fabrication, characterization, and control of VO2-based micro-electro-mechanical actuators.” 2014. Thesis, Michigan State University. Accessed January 24, 2021. http://etd.lib.msu.edu/islandora/object/etd:2505.

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

MLA Handbook (7^th Edition):

Merced, Emmanuell J. “Design, fabrication, characterization, and control of VO2-based micro-electro-mechanical actuators.” 2014. Web. 24 Jan 2021.

Vancouver:

Merced EJ. Design, fabrication, characterization, and control of VO2-based micro-electro-mechanical actuators. [Internet] [Thesis]. Michigan State University; 2014. [cited 2021 Jan 24]. Available from: http://etd.lib.msu.edu/islandora/object/etd:2505.

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

Council of Science Editors:

Merced EJ. Design, fabrication, characterization, and control of VO2-based micro-electro-mechanical actuators. [Thesis]. Michigan State University; 2014. Available from: http://etd.lib.msu.edu/islandora/object/etd:2505

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

17. Chakkarapani, Venkatasubbarao. Analysis of stress singularity of adhered contacts in MEMS.

Degree: Mechanical Engineering, 2004, Texas Tech University

URL: http://hdl.handle.net/2346/13940

► MEMS devices are usually multimaterial systems where interfaces are formed at the junction of two materials. Failure occurs at adhered contacts because of biomaterial stress… (more)

Subjects/Keywords: Microelectromechanical systems; Materials – Evaluation; Microelectromechanical systems; Microelectronics – Reliability; Asymptotic distribution (Probability theory); System design; Design and construction

…Probabilistic Design System is (ANSYS PDS) is a finite element design module in ANSYS… …Microelectromechanical systems (MEMS) technology is one of the recent rapidly growing technologies… …proper structural design of the microstructure. Structural failure occurs because of high… …polar coordinate system is assumed at the crack tip, then failure is caused by the normal… …adhered contact (22). The design of these switches is based on the operation of…

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APA (6^th Edition):

Chakkarapani, V. (2004). Analysis of stress singularity of adhered contacts in MEMS. (Thesis). Texas Tech University. Retrieved from http://hdl.handle.net/2346/13940

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):

Chakkarapani, Venkatasubbarao. “Analysis of stress singularity of adhered contacts in MEMS.” 2004. Thesis, Texas Tech University. Accessed January 24, 2021. http://hdl.handle.net/2346/13940.

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

MLA Handbook (7^th Edition):

Chakkarapani, Venkatasubbarao. “Analysis of stress singularity of adhered contacts in MEMS.” 2004. Web. 24 Jan 2021.

Vancouver:

Chakkarapani V. Analysis of stress singularity of adhered contacts in MEMS. [Internet] [Thesis]. Texas Tech University; 2004. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/2346/13940.

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

Council of Science Editors:

Chakkarapani V. Analysis of stress singularity of adhered contacts in MEMS. [Thesis]. Texas Tech University; 2004. Available from: http://hdl.handle.net/2346/13940

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

Northeastern University

18. Walther-Grant, Eric. Analysis of the combined mode resonance in aluminum nitride MEMS resonators.

Degree: MS, Department of Electrical and Computer Engineering, 2016, Northeastern University

URL: http://hdl.handle.net/2047/D20195508

► Aluminum Nitride (AlN) contour-extensional mode resonators (CMRs) have shown great promise for use in a wide range of technologies due to their scalability and the… (more)

Subjects/Keywords: AlN; contour mode; MEMS; piezoelectric properties; Piezoelectric devices; Design and construction; Resonators; Design and construction; Resonance; Mathematical models; Microelectromechanical systems; Design and construction; Aluminum nitride; Finite element method

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APA (6^th Edition):

Walther-Grant, E. (2016). Analysis of the combined mode resonance in aluminum nitride MEMS resonators. (Masters Thesis). Northeastern University. Retrieved from http://hdl.handle.net/2047/D20195508

Chicago Manual of Style (16^th Edition):

Walther-Grant, Eric. “Analysis of the combined mode resonance in aluminum nitride MEMS resonators.” 2016. Masters Thesis, Northeastern University. Accessed January 24, 2021. http://hdl.handle.net/2047/D20195508.

MLA Handbook (7^th Edition):

Walther-Grant, Eric. “Analysis of the combined mode resonance in aluminum nitride MEMS resonators.” 2016. Web. 24 Jan 2021.

Vancouver:

Walther-Grant E. Analysis of the combined mode resonance in aluminum nitride MEMS resonators. [Internet] [Masters thesis]. Northeastern University; 2016. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/2047/D20195508.

Council of Science Editors:

Walther-Grant E. Analysis of the combined mode resonance in aluminum nitride MEMS resonators. [Masters Thesis]. Northeastern University; 2016. Available from: http://hdl.handle.net/2047/D20195508

IUPUI

19. Yuanzhi, Cao. The development of polystyrene based microfluidic gas generation system.

Degree: 2015, IUPUI

URL: http://hdl.handle.net/1805/7916

►

Indiana University-Purdue University Indianapolis (IUPUI)

The purpose of this thesis is to use experimental methods to seek deeper understanding and better performance in the self-circulating… (more)

▼

Indiana University-Purdue University Indianapolis (IUPUI)

The purpose of this thesis is to use experimental methods to seek deeper understanding and better performance in the self-circulating self-regulating microfluidic gas generator initially developed in Dr. Zhu’s group, by changing the major features and dimensions in the reaction channel of the device. In order to effectively conduct experiments described above, a microfabrication method that is capable of making new microfluidic devices with low cost, short time period, as well as relatively high accuracy was needed first. Developing such a fabrication method is the major part of this thesis. We initially used patterned polymer films and glass slide, and bonded them together by sequentially aligning and stacking them into a microfluidic device with patterned double-sided tapes. Later we developed a more advanced microfabrication method that used only patterned polystyrene (PS) films. The patterned PS films were obtained from a digital cutter and they were bonded into a microfluidic device by thermopress bonding method that required no heterogeneous bonding agents. This new method did not need manual assembly which greatly improved its precision (~ 100 µm), and it used only PS as device material that has favorable surface wetting property for microfluidics applications. In order to find the optimized microfluidic channel design to improve gas generating performance, we've designed and fabricated microfluidic devices with different channel dimensions using the PS fabrication method. Based on the gas generation testing results of those devices, we were able to come up with the optimal dimensions for the reaction channel that had the best gas generation performance. To obtain a more fundamental understanding about the working mechanism of our device and its bubble dynamics, we have conducted ultrafast X-ray imaging test at Advanced Photon Source (APS), Argonne National Laboratory. High speed (100 KHz) phase contrast images were captured that allowed us to observe directly inside the reaction channel on the cross section view during the self-circulating catalytic reaction. The images provided us with lots of insightful information that in turn helped the dimensional improvement for the microchannel design. The 100 KHz high speed images also gave us useful information about the dynamics of bubble development on a catalyst bed, such as growth and merging of the bubbles.

Advisors/Committee Members: Zhu, Likun, Yu, Huidan, El-Mounayri, Hazim A., Anwar, Sohel.

Subjects/Keywords: Microfluidics, Gas generation system, polystyrene; Microfluidics – Research; Microfluidic devices – Research; Polystyrene – Research; Microfabrication – Research; Microelectromechanical systems – Research; Electromechanical devices – Design and construction; Hydrodynamics; Mixing – Research; Gases – Research; Bubbles – Dynamics; Catalysis – Research

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APA (6^th Edition):

Yuanzhi, C. (2015). The development of polystyrene based microfluidic gas generation system. (Thesis). IUPUI. Retrieved from http://hdl.handle.net/1805/7916

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):

Yuanzhi, Cao. “The development of polystyrene based microfluidic gas generation system.” 2015. Thesis, IUPUI. Accessed January 24, 2021. http://hdl.handle.net/1805/7916.

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

MLA Handbook (7^th Edition):

Yuanzhi, Cao. “The development of polystyrene based microfluidic gas generation system.” 2015. Web. 24 Jan 2021.

Vancouver:

Yuanzhi C. The development of polystyrene based microfluidic gas generation system. [Internet] [Thesis]. IUPUI; 2015. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/1805/7916.

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

Council of Science Editors:

Yuanzhi C. The development of polystyrene based microfluidic gas generation system. [Thesis]. IUPUI; 2015. Available from: http://hdl.handle.net/1805/7916

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

Rochester Institute of Technology

20. Barron, Lance. High-reflectance, sputter-deposited aluminum alloy thin thin films for micro-electro-mechanical systems.

Degree: Center for Materials Science and Engineering, 2005, Rochester Institute of Technology

URL: https://scholarworks.rit.edu/theses/5760

► This study comprises an investigation of highly reflective thin film for microelectro- mechanical systems (MEMS) consisting of reflective components. For these applications, the desired film… (more)

▼ This study comprises an investigation of highly reflective thin film for microelectro- mechanical systems (MEMS) consisting of reflective components. For these applications, the desired film system must have (1) low stress, (2) high specular reflectivity, (3) improved nano-hardness relative to pure aluminum, (4) compatibility with traditional semiconductor fabrication techniques. This study is an in depth investigation of both the specular reflectance and mechanical properties of thin film reflectors formed by low-thermal (<200°C) processing. Six different aluminum films (containing Cu, Ti, Cr) were chosen based on extensive literature research. Each film was characterized by a variety of optical, electrical, and mechanical analytical techniques to obtain data relating microstructure to the film’s reflectivity and mechanical properties. A complete dielectric function for each deposited aluminum alloy has been developed utilizing Drude-Lorentz parameters and effective media approximations (EMA) to account for film surface topography. Results show that copper solute addition generate films that maintain much of the bulk reflectance of pure aluminum while refining surface morphology to create a more specular surface consisting of smaller, more uniform grains. Electron and atomic force microscopy and x-ray diffraction studies reveal that copper inclusion into the aluminum lattice cause both a reduction in the preferred orientation of the film and change in the lattice parameter. Copper concentrations of 1.0% and above lead to spatial variation in copper content within the films, with copper precipitating out of solution. Film hardness, resistivity, and stress increase as a function of copper content, with the absolute magnitude of stress being acceptable for MEMS applications. The addition of titanium and chromium to Al-1.0%Cu films cause further microstructure refinement as well as increased stress, resistivity, and hardness. Al-2.0%Ti-1.0%Cu and Al-2.0%Cr-1.0%Cu exhibit reflectivity spectra that differ significantly in both inter- and intraband absorption from that of pure aluminum. The Drude-Lorentz/EMA dielectric function model has been successfully applied to all alloy films explaining the observed reflectivity and showing an excellent agreement between measured and Drude resistivity. This study will enable to model and predict the optical response of thin films in terms of their intrinsic and extrinsic properties Advisors/Committee Members: Kurinec, Santosh.

Subjects/Keywords: Thin films; Aluminum alloys; Microelectromechanical systems; Design and construction

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APA (6^th Edition):

Barron, L. (2005). High-reflectance, sputter-deposited aluminum alloy thin thin films for micro-electro-mechanical systems. (Thesis). Rochester Institute of Technology. Retrieved from https://scholarworks.rit.edu/theses/5760

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):

Barron, Lance. “High-reflectance, sputter-deposited aluminum alloy thin thin films for micro-electro-mechanical systems.” 2005. Thesis, Rochester Institute of Technology. Accessed January 24, 2021. https://scholarworks.rit.edu/theses/5760.

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

MLA Handbook (7^th Edition):

Barron, Lance. “High-reflectance, sputter-deposited aluminum alloy thin thin films for micro-electro-mechanical systems.” 2005. Web. 24 Jan 2021.

Vancouver:

Barron L. High-reflectance, sputter-deposited aluminum alloy thin thin films for micro-electro-mechanical systems. [Internet] [Thesis]. Rochester Institute of Technology; 2005. [cited 2021 Jan 24]. Available from: https://scholarworks.rit.edu/theses/5760.

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

Council of Science Editors:

Barron L. High-reflectance, sputter-deposited aluminum alloy thin thin films for micro-electro-mechanical systems. [Thesis]. Rochester Institute of Technology; 2005. Available from: https://scholarworks.rit.edu/theses/5760

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

Michigan State University

21. Lin, Tung-Yi. Finger-powered thermoplastic microfluidic electrochemical assay for diagnostic testing using a mobile phone.

Degree: 2018, Michigan State University

URL: http://etd.lib.msu.edu/islandora/object/etd:6976

► "Point-of-care (POC) testing has gained considerable attention in recent years due to its ability to provide diagnostic information without the need for centralized laboratory facilities… (more)

▼ "Point-of-care (POC) testing has gained considerable attention in recent years due to its ability to provide diagnostic information without the need for centralized laboratory facilities or bulky equipment. This has been achieved, in part, by advances in micro-electro-mechanical system (MEMS) and analytical chemistry, which has resulted in the miniaturization and integration of sensitive biosensors and fluidic components. Recently, researchers have demonstrated the use of mobile phones for POC testing, which offers the advantages of portability and wireless data transmission. Many mobile phone-based POC tests are based on optical imaging or colorimetric assays, which are useful for some diagnostic applications, but lack the accuracy and sensitivity required for the diagnosis of many important diseases. Moreover, these devices employ microfluidic chips fabricated using glass, polydimethylsiloxane (PDMS) or paper, which require complex microfabrication or surface treatments, or offer limited fluidic control. In this dissertation, we explored the development of plastic-based microfluidic chips for rapid electrochemical measurements of protein biomarkers using a mobile phone biosensing platform. We first investigated UV/ozone (UVO) surface treatment on plastics to better understand its usefulness for microfluidic POC applications. We found that UVO-treated poly(methyl methacrylate) (PMMA), cyclic olefin copolymer (COC) and polycarbonate (PC) experience hydrophobic recovery within 4 weeks and the rate at which it occurs is dependent on the UVO treatment duration. Furthermore, we discovered that the hydrophobic recovery of UVO-treated COC and PC can be inhibited by storing them in dehumidified or vacuum conditions. UVO-treated plastics were also used for protein adsorption measurements, which showed that UVO treatment minimized protein adsorption and this effect is correlated with the treatment duration. Lastly, we demonstrated capillary-driven flows in UVO-treated PMMA microchannels, which revealed that the flow rate can be tuned by adjusting the treatment duration. We also explored the development of new fabrication methods for generating plastic microfluidic devices. In particular, we have demonstrated for the first time the use of 3D printed metal molds for fabricating plastic microchannels via hot embossing. Through the optimization of the powder composition and processing parameters, we generated stainless steel molds with superior material properties (density and surface finish) and replication accuracy compared with previously reported 3D printed metal parts. 3D printed molds were used to fabricate PMMA replicas, which exhibited good feature integrity and replication quality. Microchannels fabricated using these replicas exhibited leak-free operation and comparable flow performance as microchannels fabricated from CNC milled molds for both capillary and pressure-driven flows. Toward the realization of a shelf stable, electricity-free microfluidic assay for POC testing, we developed a finger-powered microfluidic… Advisors/Committee Members: Lillehoj, Peter Bjorn, Li, Wen, Yeom, Junghoon, Koochesfahani, Manoochehr.

Subjects/Keywords: Microfluidic devices – Design and construction; Point-of-care testing; Microelectromechanical systems; Biochemical markers; Cell phones; Mechanical engineering

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APA (6^th Edition):

Lin, T. (2018). Finger-powered thermoplastic microfluidic electrochemical assay for diagnostic testing using a mobile phone. (Thesis). Michigan State University. Retrieved from http://etd.lib.msu.edu/islandora/object/etd:6976

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):

Lin, Tung-Yi. “Finger-powered thermoplastic microfluidic electrochemical assay for diagnostic testing using a mobile phone.” 2018. Thesis, Michigan State University. Accessed January 24, 2021. http://etd.lib.msu.edu/islandora/object/etd:6976.

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

MLA Handbook (7^th Edition):

Lin, Tung-Yi. “Finger-powered thermoplastic microfluidic electrochemical assay for diagnostic testing using a mobile phone.” 2018. Web. 24 Jan 2021.

Vancouver:

Lin T. Finger-powered thermoplastic microfluidic electrochemical assay for diagnostic testing using a mobile phone. [Internet] [Thesis]. Michigan State University; 2018. [cited 2021 Jan 24]. Available from: http://etd.lib.msu.edu/islandora/object/etd:6976.

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

Council of Science Editors:

Lin T. Finger-powered thermoplastic microfluidic electrochemical assay for diagnostic testing using a mobile phone. [Thesis]. Michigan State University; 2018. Available from: http://etd.lib.msu.edu/islandora/object/etd:6976

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

University of New Mexico

22. Abbas, Khawar. Characterization of the mechanical properties of freestanding platinum thin films.

Degree: Mechanical Engineering, 2013, University of New Mexico

URL: http://hdl.handle.net/1928/23078

► Many MEMS devices utilize nanocrystalline thin metallic films as mechanical structures, in particular, micro switching devices where these films are used as Ohmic contacts. But… (more)

▼ Many MEMS devices utilize nanocrystalline thin metallic films as mechanical structures, in particular, micro switching devices where these films are used as Ohmic contacts. But the elastic and plastic properties of these thin films (thickness < 1μm) are significantly different from those of the bulk material. At these scales the volume fraction of material defects such as: grain boundaries, dislocations and interstitials become quite significant and become a chief contributor to the physical and mechanical material properties. In order to effectively design MEMS devices it is important that these material properties are explored and mechanical behavior of the structure they form be characterized. Popular thin film materials used in MEMS devices are Aluminum (Al), Copper (Cu), Nickel (Ni) and Gold (Au). Platinum has traditionally gained acceptance into the MEMS industry because of its chemical inertness and high temperature stability. However the mechanical properties of platinum remains the least exploited. Platinum has a high Youngs Modulus (164 GPa, for bulk) and high melting temperature (1768 °C) and therefore can be used as a 'thin film' structure (cantilever, a bridge or a membrane) in high temperature environments with high resistance to mechanical failure. The physical size of these thin film structure make it very difficult to handle them and employ traditional mechanical testing methodologies and techniques and therefore require custom test platforms. One such recently developed platform is presented in this dissertation. The test platform is comprised of a microfabricated cascaded thermal actuator system and test specimen. The cascaded thermal actuator system is capable of providing tens of microns of displacement and tens of milli-Newton forces simultaneously while applying a relatively low temperature gradient across the test specimen. The dimensions of the platform make its use possible in both the SEM/TEM environments and on a probe station under an optical microscope. Digital image correlation was used to obtain similar accuracy (~10 nm) for displacement measurements in both an SEM and under an optical microscope. The mechanical behavior of nanocrystalline thin film structure has been the subject of extensive research in recent years. Mainly, the focus has been on the effects of the film thickness with only a few researchers mentioning anything about the grain sizes of their polycrystalline films. The effect of thin film cross sectional morphology on the mechanical behavior of a thin film structure has never been studied directly. Presented in this dissertation is experimental evidence that these thin film structures are composite structures of various grain morphologies and the overall mechanical behavior exhibited by them is the combined effect of individual contributions of each of these grain morphologies.' Advisors/Committee Members: Leseman, Zayd, Shen, Yu-Lin, Hall, Christopher, Hossein-Zadeh, Mani.

Subjects/Keywords: Metallic films – Mechanical properties – Testing; Platinum – Mechanical properties – testing; Microactuators; Nanostructured materials – Testing; Microelectromechanical systems – Design and construction.

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APA (6^th Edition):

Abbas, K. (2013). Characterization of the mechanical properties of freestanding platinum thin films. (Doctoral Dissertation). University of New Mexico. Retrieved from http://hdl.handle.net/1928/23078

Chicago Manual of Style (16^th Edition):

Abbas, Khawar. “Characterization of the mechanical properties of freestanding platinum thin films.” 2013. Doctoral Dissertation, University of New Mexico. Accessed January 24, 2021. http://hdl.handle.net/1928/23078.

MLA Handbook (7^th Edition):

Abbas, Khawar. “Characterization of the mechanical properties of freestanding platinum thin films.” 2013. Web. 24 Jan 2021.

Vancouver:

Abbas K. Characterization of the mechanical properties of freestanding platinum thin films. [Internet] [Doctoral dissertation]. University of New Mexico; 2013. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/1928/23078.

Council of Science Editors:

Abbas K. Characterization of the mechanical properties of freestanding platinum thin films. [Doctoral Dissertation]. University of New Mexico; 2013. Available from: http://hdl.handle.net/1928/23078

Michigan State University

23. Kiran, Rohitashwa. Numerical simulations for performance enhancement of a radial, pressure wave driven, internal combustion engine.

Degree: 2013, Michigan State University

URL: http://etd.lib.msu.edu/islandora/object/etd:1447

►

Thesis Ph. D. Michigan State University. Mechanical Engineering 2013.

The Wave Disk Engine is a new engine concept which employs pressure wave compression and expansion,… (more)

▼

Thesis Ph. D. Michigan State University. Mechanical Engineering 2013.

The Wave Disk Engine is a new engine concept which employs pressure wave compression and expansion, constant volume combustion, and power extraction within a compact rotating disk. It is a logical next step in the advancement of internal combustion wave rotor technology. Such devices achieve compression of a combustible mixture by the sudden closing of a port and power extraction when a port opens. The timing of port opening and closing is determined by the time required for compression and expansion waves to travel along the length of the channel. Most of the research in this field has been directed at finding the correct port timings purely on the basis of fluid mechanics. However combustion inside these devices has not been studied in a thorough manner either numerically or experimentally. The first part of this work discusses numerical investigations attempting to understand the combustion process in the presence of a periodic flow induced by the opening and closing of ports. Numerical evaluations are provided for the detailed flame shape for simplified chemistry and a simulation using the detailed San Diego mechanism. Other quantities examined are vorticity, pressure fluctuations, mass consumption rate, flame surface area and the influences of adiabatic and non-adiabatic channel walls. The focus of the study is on quantities that influence overall burning rate and completeness of combustion.The second part of this work deals with the introduction of certain design features to the Wave Disk Engine which can help in increasing the power extraction and overall efficiency of the device. These include - reinjection of combusted gas into fresh combustible mixture, a second row of turbine blades outside the wave disk, and an external combustion chamber. The overall thermodynamic efficiency of this device, which references the Humphrey thermodynamic cycle, increases with the increased pressure inside the combustion channel prior to combustion. One possible and sustainable way of achieving pre-compression in a combustion channel is to re-inject combusted gas from the previous cycle, before it is expanded. Computational fluid dynamic simulations are run for different angular speeds of the engine and widths of the re-injection passage. A balance is sought between loss of mass and enthalpy in a high pressure combustion channel and the gain in pressure and enthalpy in the low pressure channel, which would maximize overall cycle efficiency. A Wave Disk Engine equipped with a reinjection passage as well as a second row of turbine blades is provides the highest thermodynamic efficiency in this study. Another Wave Disk Engine design is proposed which addresses the problem of seizing by using two discs made of ceramic stacked on top of each other. One disc serves as a combustion chamber and the other to compress fuel-air mixture and generate power.

Description based on online resource; title from PDF t.p. (viewed on Sept. 3, 2014).

Advisors/Committee Members: Mueller, Norbert, Wichman, Indrek S, Lee, Tonghun, Strangas, Elias.

Subjects/Keywords: Internal combustion engines – Design and construction; Gas-turbine disks; Unsteady flow (Fluid dynamics); Microelectromechanical systems; Mechanical engineering

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APA (6^th Edition):

Kiran, R. (2013). Numerical simulations for performance enhancement of a radial, pressure wave driven, internal combustion engine. (Thesis). Michigan State University. Retrieved from http://etd.lib.msu.edu/islandora/object/etd:1447

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):

Kiran, Rohitashwa. “Numerical simulations for performance enhancement of a radial, pressure wave driven, internal combustion engine.” 2013. Thesis, Michigan State University. Accessed January 24, 2021. http://etd.lib.msu.edu/islandora/object/etd:1447.

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

MLA Handbook (7^th Edition):

Kiran, Rohitashwa. “Numerical simulations for performance enhancement of a radial, pressure wave driven, internal combustion engine.” 2013. Web. 24 Jan 2021.

Vancouver:

Kiran R. Numerical simulations for performance enhancement of a radial, pressure wave driven, internal combustion engine. [Internet] [Thesis]. Michigan State University; 2013. [cited 2021 Jan 24]. Available from: http://etd.lib.msu.edu/islandora/object/etd:1447.

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

Council of Science Editors:

Kiran R. Numerical simulations for performance enhancement of a radial, pressure wave driven, internal combustion engine. [Thesis]. Michigan State University; 2013. Available from: http://etd.lib.msu.edu/islandora/object/etd:1447

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

Michigan State University

24. Cao, Yunqi. Advanced sensing technologies : from vanadium dioxide MEMS resonators to polypropylene ferroelectret nanogenerators.

Degree: 2019, Michigan State University

URL: http://etd.lib.msu.edu/islandora/object/etd:48234

►

Thesis Ph. D. Michigan State University. Electrical Engineering 2019.

"This thesis presents fundamental and applied research studies designed to enable smart material-based advanced sensing technologies… (more)

▼

Thesis Ph. D. Michigan State University. Electrical Engineering 2019.

"This thesis presents fundamental and applied research studies designed to enable smart material-based advanced sensing technologies including the use of vanadium dioxide (VO2) thin films in resonant frequency tuning methods, and the self-powering/energy harvesting capabilities of polypropylene ferroelectret (PPFE) polymers. The large compressive stress generated from VO2 thin films during its insulator-to-metal transition (IMT) has been investigated in recent years for thermally actuated MEMS actuators. This same mechanism can be used to generate axial stress that produces large shifts in resonant frequencies. Nevertheless, taking full advantage of all benefits of this technique for tunable devices requires a fundamental understanding of the mechanisms involved and the influences of different parameters; such as structural aspect ratios, boundary conditions, buckling status, and actuation methods. In this work, VO2-based MEMS bridge and cantilever resonators were developed, and their resonant frequency shifts were characterized with respect to these parameters. It is found that residual thermal stress during the fabrication process is responsible for different buckling states in bridge structures. Bi-directional tuning for a monotonic input is observed in pre-buckled structures, which is related to bending moments and actuation methods. A ferroelectret nanogenerator is also introduced in this work as a new tuning technique to provide a programming current that allows fast switching between different resonant frequency states. This demonstrates the potential use of self-powered tuning actuation of MEMS resonators. Studies of VO2-based resonators on the power consumption and the device time constant also pave the way for integrating MEMS devices with piezoelectric energy harvesters as impact sensors.With the goal of enabling self-powered sensing technologies, a series of studies designed to understand the parameters that determine the electromechanical coupling in ferroelectret nanogenerators are presented. The electromechanical response of the active material is analyzed based on fundamental working principles of dipole moments. A lumped model is proposed, which is developed from constitutive equations and validated with experiments. The robustness of the device is verified through a series of tests including mechanical repeatability, thermal stability, and humidity resistance. The energy conversion efficiency and maximum power transfer condition are determined under periodic mechanical input, and a complete energy harvesting system with a fully integrated power management circuit is proposed for providing DC power output to effectively charge lithium-ion batteries or power small electronics." – Pages ii-iii.

Description based on online resource;

Advisors/Committee Members: Sepúlveda, Nelson, Papapolymerou, John, Li, Wen, Yeom, Junghoon.

Subjects/Keywords: Thin films – Electric properties; Vanadium oxide; Thin-film circuits; Microactuators; Microelectromechanical systems – Design and construction; Nanotechnology; Electrical engineering

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APA (6^th Edition):

Cao, Y. (2019). Advanced sensing technologies : from vanadium dioxide MEMS resonators to polypropylene ferroelectret nanogenerators. (Thesis). Michigan State University. Retrieved from http://etd.lib.msu.edu/islandora/object/etd:48234

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):

Cao, Yunqi. “Advanced sensing technologies : from vanadium dioxide MEMS resonators to polypropylene ferroelectret nanogenerators.” 2019. Thesis, Michigan State University. Accessed January 24, 2021. http://etd.lib.msu.edu/islandora/object/etd:48234.

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

MLA Handbook (7^th Edition):

Cao, Yunqi. “Advanced sensing technologies : from vanadium dioxide MEMS resonators to polypropylene ferroelectret nanogenerators.” 2019. Web. 24 Jan 2021.

Vancouver:

Cao Y. Advanced sensing technologies : from vanadium dioxide MEMS resonators to polypropylene ferroelectret nanogenerators. [Internet] [Thesis]. Michigan State University; 2019. [cited 2021 Jan 24]. Available from: http://etd.lib.msu.edu/islandora/object/etd:48234.

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

Council of Science Editors:

Cao Y. Advanced sensing technologies : from vanadium dioxide MEMS resonators to polypropylene ferroelectret nanogenerators. [Thesis]. Michigan State University; 2019. Available from: http://etd.lib.msu.edu/islandora/object/etd:48234

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

Hong Kong University of Science and Technology

25. Ma, Wei. Low temperature metal-based micro fabrication and packaging technology.

Degree: 2005, Hong Kong University of Science and Technology

URL: http://repository.ust.hk/ir/Record/1783.1-2432 ; https://doi.org/10.14711/thesis-b856970 ; http://repository.ust.hk/ir/bitstream/1783.1-2432/1/th_redirect.html

► A low temperature multiple photoresist mold metal electroplating technology was developed. This technology can be utilized to fabricate metallic MEMS devices directly on substrates containing… (more)

▼ A low temperature multiple photoresist mold metal electroplating technology was developed. This technology can be utilized to fabricate metallic MEMS devices directly on substrates containing IC fabricated electronic devices by a post-IC process. Normal IC process flow is not affected by the add-on MEMS process. A further integrated packaging solution is also proposed with the same low temperature plating technology to supply the first-level, wafer scale package. The packaging process combines with the MEMS devices process seamlessly to unite the MEMS integration and packaging as a whole. Integration and packaging are considered together at the beginning of MEMS design which allows this technology to realize real batch fabrication and fulfill the task of low-cost manufacturing to meet the low-end application requirement. A packaged electrical inertia micro-switch was implemented. Separate and non-interfering photoresist-molded Au, Cu and PbSn solder metal-electroplating processes have been applied to the fabrication of the micro-switches and their wafer-level packaging in sealed cavities. The switches were designed using a simple but accurate lumped spring-mass model. The threshold velocity and natural frequency were calibrated by the drop hammer test and shaker test respectively. Testing results showed the good coincidence with the designed values. Packaging scheme supply the solution of independently control for the height of a switch and that of its cavity. It also provides leads for low-resistance electrical access to the sealed devices. The measured critical shear stress before packaging failure was around 30MPa for all samples. Using both the gross leak and fine leak hermeticity tests, all the samples reached the requirement. An integrated floating gate electrostatic micro power generator was also implemented by the developed technology. The micro power generator was designed based on the technology of floating gate. The pre-charged floating gate by the TN tunneling technique acted as the voltage bias. Power is generated using a variable capacitor, formed between the resonator and the floating gate. A full analysis of the generator was done based on the system differential equations. A linear model for small signal input and a general model for nonlinearity analysis were built. Simulations were done using both models. The results from the two models corresponded well with each other. The properties of the electronic devices and the mechanical resonator were fully tested. The consistency of the electronic devices properties before and after the back-end process showed that the processing of the mechanical device has little effect on standard IC devices. Output power depending on the driving frequency and the resistant load was investigated using the shaker test. The maximum output power happened at the designed natural frequency. With an optimum load, the power generator worked at the pre-designed scale.

Subjects/Keywords: Microelectronic packaging ; Optoelectronic devices – Design and construction ; Microelectromechanical systems ; Microelectromechanical systems – Design and construction

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

APA (6^th Edition):

Ma, W. (2005). Low temperature metal-based micro fabrication and packaging technology. (Thesis). Hong Kong University of Science and Technology. Retrieved from http://repository.ust.hk/ir/Record/1783.1-2432 ; https://doi.org/10.14711/thesis-b856970 ; http://repository.ust.hk/ir/bitstream/1783.1-2432/1/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):

Ma, Wei. “Low temperature metal-based micro fabrication and packaging technology.” 2005. Thesis, Hong Kong University of Science and Technology. Accessed January 24, 2021. http://repository.ust.hk/ir/Record/1783.1-2432 ; https://doi.org/10.14711/thesis-b856970 ; http://repository.ust.hk/ir/bitstream/1783.1-2432/1/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):

Ma, Wei. “Low temperature metal-based micro fabrication and packaging technology.” 2005. Web. 24 Jan 2021.

Vancouver:

Ma W. Low temperature metal-based micro fabrication and packaging technology. [Internet] [Thesis]. Hong Kong University of Science and Technology; 2005. [cited 2021 Jan 24]. Available from: http://repository.ust.hk/ir/Record/1783.1-2432 ; https://doi.org/10.14711/thesis-b856970 ; http://repository.ust.hk/ir/bitstream/1783.1-2432/1/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:

Ma W. Low temperature metal-based micro fabrication and packaging technology. [Thesis]. Hong Kong University of Science and Technology; 2005. Available from: http://repository.ust.hk/ir/Record/1783.1-2432 ; https://doi.org/10.14711/thesis-b856970 ; http://repository.ust.hk/ir/bitstream/1783.1-2432/1/th_redirect.html

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

Rice University

26. Wilkowski, Rose. Surface and Seam.

Degree: M. Arch., Architecture, 2020, Rice University

URL: http://hdl.handle.net/1911/108340

► Often in projects, seaming of material is not considered until late stages in the construction process where the options are to abide by manufacturers standards… (more)

Subjects/Keywords: architecture; design; interior design; building; system; building system; material system; surface; seam; material seam; residential architecture; residential design; wall design; wall panels; construction system; stick construction

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APA (6^th Edition):

Wilkowski, R. (2020). Surface and Seam. (Masters Thesis). Rice University. Retrieved from http://hdl.handle.net/1911/108340

Chicago Manual of Style (16^th Edition):

Wilkowski, Rose. “Surface and Seam.” 2020. Masters Thesis, Rice University. Accessed January 24, 2021. http://hdl.handle.net/1911/108340.

MLA Handbook (7^th Edition):

Wilkowski, Rose. “Surface and Seam.” 2020. Web. 24 Jan 2021.

Vancouver:

Wilkowski R. Surface and Seam. [Internet] [Masters thesis]. Rice University; 2020. [cited 2021 Jan 24]. Available from: http://hdl.handle.net/1911/108340.

Council of Science Editors:

Wilkowski R. Surface and Seam. [Masters Thesis]. Rice University; 2020. Available from: http://hdl.handle.net/1911/108340

Cape Peninsula University of Technology

27. Hendrickse, Christopher Justin. Development of the user input system for the control room upgrade of Southern African Large Telescope (SALT) .

Degree: 2015, Cape Peninsula University of Technology

URL: http://etd.cput.ac.za/handle/20.500.11838/2394

► Whether one is fascinated by the night sky as a child, or as a professional astronomer looking back to the beginning of time solving life’s… (more)

▼ Whether one is fascinated by the night sky as a child, or as a professional astronomer looking back to the beginning of time solving life’s big questions; at some point in our lives we have curiously looked up at the heavens above. The desire to explore the universe has lead us to constructing larger and more advanced telescopes, with the sole focus of observing deeper into the cosmos in an attempt to unravel its secrets. Like with most other technological advances, it has created advanced and technically complex control rooms. Based on a design ethnographic study this thesis will focus on the exploration of the effects of complex interfaces of a control room environment and its users, where one of the leading twenty first century telescopes of its kind, Southern Africa Largest Telescope (SALT), is studied. While the STS framework and policy debates concerning the rapid development and integration of complex human and non-human systems into larger systems become common practice. The design ethnographic study revealed that the operation of the SALT telescope and the research being conducted by the astronomers is clearly hindered by poor control room design. The study identified relationships between the framework and the empirical findings, which was used to frame a design pilot study to determine if further design intervention would have a positive impact on the interaction of a control room system. This project will consist of: a literature review, an ethnographic study and the analysis of the findings, design framing of a pilot study, a design pilot study, and an evaluation of the study. The results from the design pilot study clearly show that the application of a design intervention to a control room environment could potentially impact the space positively and reduced frustration, improve comfort, increased efficiency in the users work practices, and ultimately amplified productivity. Providing an appropriate starting point for the exploration of possible solutions for identified challenges experienced in complex control room environments, more importantly it contributed to narrowing the socio-technical gap, between the mechanical and research departments of a leading international optical telescope, SALT.

Subjects/Keywords: Control rooms – Design and construction; Telescopes – Design and construction; Human-computer interaction; User-centered system design

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

APA (6^th Edition):

Hendrickse, C. J. (2015). Development of the user input system for the control room upgrade of Southern African Large Telescope (SALT) . (Thesis). Cape Peninsula University of Technology. Retrieved from http://etd.cput.ac.za/handle/20.500.11838/2394

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):

Hendrickse, Christopher Justin. “Development of the user input system for the control room upgrade of Southern African Large Telescope (SALT) .” 2015. Thesis, Cape Peninsula University of Technology. Accessed January 24, 2021. http://etd.cput.ac.za/handle/20.500.11838/2394.

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

MLA Handbook (7^th Edition):

Hendrickse, Christopher Justin. “Development of the user input system for the control room upgrade of Southern African Large Telescope (SALT) .” 2015. Web. 24 Jan 2021.

Vancouver:

Hendrickse CJ. Development of the user input system for the control room upgrade of Southern African Large Telescope (SALT) . [Internet] [Thesis]. Cape Peninsula University of Technology; 2015. [cited 2021 Jan 24]. Available from: http://etd.cput.ac.za/handle/20.500.11838/2394.

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

Council of Science Editors:

Hendrickse CJ. Development of the user input system for the control room upgrade of Southern African Large Telescope (SALT) . [Thesis]. Cape Peninsula University of Technology; 2015. Available from: http://etd.cput.ac.za/handle/20.500.11838/2394

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

Ryerson University

28. Chen, Jun Zheng. Generalized SDOF system for dynamic analysis of concrete rectangular liquid storage tanks.

Degree: 2010, Ryerson University

URL: https://digital.library.ryerson.ca/islandora/object/RULA%3A962

► Liquid storage tanks are essential facilities in lifeline and industrial systems. To ensure liquid tightness, serviceability is the prime design concern for these structures. While… (more)

▼ Liquid storage tanks are essential facilities in lifeline and industrial systems. To ensure liquid tightness, serviceability is the prime design concern for these structures. While there have been major studies on the behavior of steel tanks, little attention has been paid to the behavior of rectangular concrete tanks. In this study, the dynamic response of concrete rectangular liquid storage tanks is investigated. In the current design practice, the response of liquid and tank structure is determined based on rigid tank wall and the lumped mass approach. However, the results of analysis show that the flexibility of tank wall increases the hydrodynamic pressures as compared to the rigid wall assumption. Also, recent studies show that the lumped added mass method leads to overly conservative results in terms of base shear and base moment. In addition, in spite of advanced analysis techniques available for dynamic analysis of liquid storage tanks such as finite element method and sequential coupling analysis procedure, there is a need to develop a simplified analysis method for practical applications.In this thesis, a simplified method using the generalized single degree of freedom (SDOF) system is proposed for seismic analysis of concrete rectangular liquid containing structures (LCS). Only the impulsive hydrodynamic pressure is considered. In the proposed method, the consistent mass approach and the effect of flexibility of tank wall on hydrodynamic pressures are considered. Different analytical methods are used to verify the proposed model in this study. The comparison of results based on the current design practice, the analytical-finite element models and full finite element model using ANSYS® shows that the proposed method is fairly accurate which can be used in the structural design of liquid containing structures.Parametric studies on seismic analysis of concrete rectangular LCS using the generalized SDOF system are carried out. Five prescribed vibration shape functions representing the first mode shape of fluid structure interaction system are used to study the effect of flexibility of tank wall and boundary conditions. The effect of flexibility of tank wall, the amplitude of hydrodynamic pressure, the added mass of liquid due to hydrodynamic pressure, the effective heights for liquid containing system and the effect of higher modes on dynamic response of LCS are investigated. In addition, the effect of variable size of tanks and liquid depth are studied. The contribution of higher modes to the dynamic response of LCS is included in the proposed model. A design procedure based on the structural model using the generalized SDOF system is proposed in this study. Design charts and tables for the added mass of liquid due to impulsive hydrodynamic pressure and the corresponding effective heights are presented. The proposed design procedure can be used for engineering design applications. Advisors/Committee Members: Kianoush, M. Reza (Thesis advisor), Ryerson University (Degree grantor).

Subjects/Keywords: Storage tanks – Design and construction – Mathematical models; Concrete tanks – Design and construction; Earthquake resistant design; Finite element method; ANSYS (Computer system)

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

APA (6^th Edition):

Chen, J. Z. (2010). Generalized SDOF system for dynamic analysis of concrete rectangular liquid storage tanks. (Thesis). Ryerson University. Retrieved from https://digital.library.ryerson.ca/islandora/object/RULA%3A962

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):

Chen, Jun Zheng. “Generalized SDOF system for dynamic analysis of concrete rectangular liquid storage tanks.” 2010. Thesis, Ryerson University. Accessed January 24, 2021. https://digital.library.ryerson.ca/islandora/object/RULA%3A962.

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

MLA Handbook (7^th Edition):

Chen, Jun Zheng. “Generalized SDOF system for dynamic analysis of concrete rectangular liquid storage tanks.” 2010. Web. 24 Jan 2021.

Vancouver:

Chen JZ. Generalized SDOF system for dynamic analysis of concrete rectangular liquid storage tanks. [Internet] [Thesis]. Ryerson University; 2010. [cited 2021 Jan 24]. Available from: https://digital.library.ryerson.ca/islandora/object/RULA%3A962.

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

Council of Science Editors:

Chen JZ. Generalized SDOF system for dynamic analysis of concrete rectangular liquid storage tanks. [Thesis]. Ryerson University; 2010. Available from: https://digital.library.ryerson.ca/islandora/object/RULA%3A962

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

Ryerson University

29. Nadeem, Muhammad. High speed wireless data acquisition system.

Degree: 2014, Ryerson University

URL: https://digital.library.ryerson.ca/islandora/object/RULA%3A3482

► In a setup for a system long term stability and reliability test, sensors are used to measure physical quantities, affecting the behavior of the system,… (more)

▼ In a setup for a system long term stability and reliability test, sensors are used to measure physical quantities, affecting the behavior of the system, by sampling the sensor readings, convert it to digital numerical value and saving it for further detail analysis. The sensors are wired to a central location to collect and log data, due to extensive wiring requirements the setup is very difficult and sometimes even impossible to implement. This project presents an implementation of high speed wireless data acquisition system which samples sensors output at high speed (5 KHz), converts it to digital numerical form and sends wirelessly to central data gathering unit thus avoiding home run wiring from each sensor to central data gathering unit where it is logged on USB flash drive and send to PC for real time display. The implementation target was wireless link between a transmitter module, serving a maximum of 8 sensors at 5 KHz sampling rate and 16bit ADC resolution for each sensor, to data gathering unit. The implementation does fall short on specification on number of channels and sampling rate due to limitation of over the air data rate of the radio module, what we were able to achieve is 4 channels of 16 bit ADC resolution at 2 KHz sampling rate using radio module with 300 Kbps over the air data rate. Using different sensors and with different configurable settings the tests shows that the stored data at the data gathering unit and the data stored using wired data acquisition system has no difference. For future improvement radio module with over the air data rate (1.55 Mbps) which allows multiple transmitters connected wirelessly to a single data gathering unit providing more flexibility in sensor deployment. Even though the implementation falls short on some of the features but with using improved radio module and/or using some compression techniques on ADC data, before sending data wirelessly, these short comings could be overcome easily. Advisors/Committee Members: Kumar, Dr. Krishna (Thesis advisor), Ryerson University (Degree grantor).

Subjects/Keywords: Wireless sensor networks – Design and construction; Wireless sensor nodes; Computer architecture; System design; Analog-to-digital converters – Design and construction

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

APA (6^th Edition):

Nadeem, M. (2014). High speed wireless data acquisition system. (Thesis). Ryerson University. Retrieved from https://digital.library.ryerson.ca/islandora/object/RULA%3A3482

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):

Nadeem, Muhammad. “High speed wireless data acquisition system.” 2014. Thesis, Ryerson University. Accessed January 24, 2021. https://digital.library.ryerson.ca/islandora/object/RULA%3A3482.

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

MLA Handbook (7^th Edition):

Nadeem, Muhammad. “High speed wireless data acquisition system.” 2014. Web. 24 Jan 2021.

Vancouver:

Nadeem M. High speed wireless data acquisition system. [Internet] [Thesis]. Ryerson University; 2014. [cited 2021 Jan 24]. Available from: https://digital.library.ryerson.ca/islandora/object/RULA%3A3482.

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

Council of Science Editors:

Nadeem M. High speed wireless data acquisition system. [Thesis]. Ryerson University; 2014. Available from: https://digital.library.ryerson.ca/islandora/object/RULA%3A3482

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

30. MARTINS, MIGUEL DE SIMAS. Package+Body.

Degree: Swedish School of Textiles, 2014, University of Borås

URL: http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-18040

►

To explore the potential of packaging design structures in menswear. While packaging design and fashion design are two distinctively different fields,their methodologies are distinctively… (more)

▼

To explore the potential of packaging design structures in menswear. While packaging design and fashion design are two distinctively different fields,their methodologies are distinctively similar.To compare packaging and garment design is therefore to compare their development process and purpose in terms of structure, material, color and print, as well as aspects concerning production and marketing. Both fields aim to create designs that are functional as well as aesthetically pleasing within their particular context; the fundamental contextual difference being that packaging is conceived for a product and garments conceived for a body. Focusing on structure, both packaging and fashion design may use product templates to facilitate mass production. In fashion design these templates are called construction patterns; in packaging design templates are called packaging nets or development nets. Both construction patterns and packaging nets are 2-d structures that gain a three dimensional form according to a construction system, e.g. constructing a box from a flat element using folding techniques. For this bachelor degree work the aim is to explore the potential of packaging design structures in menswear. The result is a lineup of outfits generated by the adoption of packaging nets as construction patterns for garments. Since the outfits are created using packaging design principles and methods, they challenge the contextual distinction both between garment and packaging, and between body and product. By considering garments as packaging for the body, the collection blurs the line between fashion design and packaging design. I believe that the intersection of these two branches of design allows us not only to discover new forms of expression and construction, but also to gain a new perspective on fashion design practice. In addition to structural properties, by also considering the graphic aspect of packaging design, this collection highlights the importance of product differentiation and thus serves as a starting point for future fashion experiments with product branding.

Program: Fashion Design

Subjects/Keywords: design; methodology; fashion; packaging; garments; structure; construction patterns; packaging nets; construction system; menswear; body; product; graphics; product differentiation; Design; Design

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

APA (6^th Edition):

MARTINS, M. D. S. (2014). Package+Body. (Thesis). University of Borås. Retrieved from http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-18040

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):

MARTINS, MIGUEL DE SIMAS. “Package+Body.” 2014. Thesis, University of Borås. Accessed January 24, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-18040.

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

MLA Handbook (7^th Edition):

MARTINS, MIGUEL DE SIMAS. “Package+Body.” 2014. Web. 24 Jan 2021.

Vancouver:

MARTINS MDS. Package+Body. [Internet] [Thesis]. University of Borås; 2014. [cited 2021 Jan 24]. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-18040.

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

Council of Science Editors:

MARTINS MDS. Package+Body. [Thesis]. University of Borås; 2014. Available from: http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-18040

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

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Open Access Theses and Dissertations