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University of Colorado
1.
Ingram, Gabriel J.
Development and Analysis of Volume Multi-Sphere Method Model Generation Using Electric Field Fitting.
Degree: MS, 2017, University of Colorado
URL: https://scholar.colorado.edu/asen_gradetds/224 
► Electrostatic modeling of spacecraft has wide-reaching applications such as detumbling space debris in the Geosynchronous Earth Orbit regime before docking, servicing and tugging space debris…
(more)
▼ Electrostatic modeling of spacecraft has wide-reaching applications such as detumbling space debris in the Geosynchronous Earth Orbit regime before docking, servicing and tugging space debris to graveyard orbits, and Lorentz augmented orbits. The viability of
electrostatic actuation control applications relies on faster-than-realtime characterization of the
electrostatic interaction. The Volume Multi-Sphere Method (VMSM) seeks the optimal placement and radii of a small number of equipotential spheres to accurately model the
electrostatic force and torque on a conducting space object. Current VMSM models tuned using force and torque comparisons with commercially available finite element software are
subject to the modeled probe size and numerical errors of the software. This work first investigates fitting of VMSM models to Surface-MSM (SMSM) generated electrical field data, removing
modeling dependence on probe geometry while significantly increasing performance and speed. A proposed electric field matching cost function is compared to a force and torque cost function, the inclusion of a self-capacitance constraint is explored and 4 degree-of-freedom VMSM models generated using electric field matching are investigated. The resulting <i>E</i>-field based VMSM development framework is illustrated on a box-shaped hub with a single solar panel, and convergence properties of select models are qualitatively analyzed. Despite the complex non-symmetric spacecraft geometry, elegantly simple 2-sphere VMSM solutions provide force and torque fits within a few percent.
Advisors/Committee Members: Hanspeter Schaub, Daniel Kubitschek, Robert Marshall.
Subjects/Keywords: electrostatic modeling; multi-sphere method; analysis; spacecraft; torque; Aerospace Engineering; Analysis
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APA (6th Edition):
Ingram, G. J. (2017). Development and Analysis of Volume Multi-Sphere Method Model Generation Using Electric Field Fitting. (Masters Thesis). University of Colorado. Retrieved from https://scholar.colorado.edu/asen_gradetds/224
Chicago Manual of Style (16th Edition):
Ingram, Gabriel J. “Development and Analysis of Volume Multi-Sphere Method Model Generation Using Electric Field Fitting.” 2017. Masters Thesis, University of Colorado. Accessed March 07, 2021.
https://scholar.colorado.edu/asen_gradetds/224.
MLA Handbook (7th Edition):
Ingram, Gabriel J. “Development and Analysis of Volume Multi-Sphere Method Model Generation Using Electric Field Fitting.” 2017. Web. 07 Mar 2021.
Vancouver:
Ingram GJ. Development and Analysis of Volume Multi-Sphere Method Model Generation Using Electric Field Fitting. [Internet] [Masters thesis]. University of Colorado; 2017. [cited 2021 Mar 07].
Available from: https://scholar.colorado.edu/asen_gradetds/224.
Council of Science Editors:
Ingram GJ. Development and Analysis of Volume Multi-Sphere Method Model Generation Using Electric Field Fitting. [Masters Thesis]. University of Colorado; 2017. Available from: https://scholar.colorado.edu/asen_gradetds/224
IUPUI
2.
Vanam, Ram.
Electrostatic Modeling of Protein Aggregation.
Degree: 2004, IUPUI
URL: http://hdl.handle.net/1805/400
► Submitted to the faculty of Indiana University in partial fulfillment of the requirements for the degree Master of Science in the Department of Bioinformatics in…
(more)
▼ Submitted to the faculty of Indiana University
in partial fulfillment of the requirements
for the degree Master of Science in the Department of Bioinformatics in the School of Informatics of, Indiana University December, 2004
Ram Vanam M.S., Indiana University, December 2004. Electrostatic modeling of protein aggregation. Research Advisor: Paul L. Dubin
Electrostatic modeling was done with Delphi of insight II to explain and predict protein aggregation, measured here for β-lactoglobulin and insulin using turbidimetry and stopped flow spectrophotometry. The initial rate of aggregation of β-Lactoglobulin was studied between pH 3.8 and 5.2 in 4.5mM NaCl; and for ionic strengths from 4.5 to 500mM NaCl at pH 5.0. The initial slope of the turbidity vs. time curve was used to define the initial rate of aggregation. The highest initial rate was observed near pH < pI i.e., 4.6 (< 5.2). The decrease in aggregation rate when the pH was increased from 4.8 to 5.0 was large compared to its decrease when the pH was reduced from 4.4 to 4.2; i.e., the dependence of initial rate on pH was highly asymmetric. The initial rate of aggregation at pH 5.0 increased linearly with the reciprocal of ionic strength in the range I = 0.5 to 0.0045M. Protein electrostatic potential distributions are used to understand the pH and ionic strength dependence of the initial rate of aggregation. Similar studies were done with insulin. In contrast to BLG, the highest initial aggregation rate for insulin was observed at pH = pI. Electrostatic computer modeling shows that these differences arise from the distinctly different surface charge distributions of insulin and BLG.
Subjects/Keywords: electrostatic modeling; protein aggregation
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APA (6th Edition):
Vanam, R. (2004). Electrostatic Modeling of Protein Aggregation. (Thesis). IUPUI. Retrieved from http://hdl.handle.net/1805/400
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Vanam, Ram. “Electrostatic Modeling of Protein Aggregation.” 2004. Thesis, IUPUI. Accessed March 07, 2021.
http://hdl.handle.net/1805/400.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Vanam, Ram. “Electrostatic Modeling of Protein Aggregation.” 2004. Web. 07 Mar 2021.
Vancouver:
Vanam R. Electrostatic Modeling of Protein Aggregation. [Internet] [Thesis]. IUPUI; 2004. [cited 2021 Mar 07].
Available from: http://hdl.handle.net/1805/400.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Vanam R. Electrostatic Modeling of Protein Aggregation. [Thesis]. IUPUI; 2004. Available from: http://hdl.handle.net/1805/400
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Université de Grenoble
3.
Romanescu, Sorin.
Modèle compact paramétrable du SCR pour applications ESD et RF : Scalable compact SCR model for ESD&RF applications.
Degree: Docteur es, Sciences et technologie industrielles, 2011, Université de Grenoble
URL: http://www.theses.fr/2011GRENT055
► La protection contre les décharges électrostatiques (ESD) est un fait necessaire dans chaque circuit intégré. Elle se fait par le déploiement sur la puce d'un…
(more)
▼ La protection contre les décharges électrostatiques (ESD) est un fait necessaire dans chaque circuit intégré. Elle se fait par le déploiement sur la puce d'un réseau de dispositifs spéciaux, à côtés des éléments fonctionnels. La demande pour des améliorations en continu dans la conception et la simulation de l'ESD apporte le besoin de modèles nouveaux et plus précises. La SCR (« Silicon Controlled Rectifier ») est l'un des dispositifs les plus efficaces de protection contre l'ESD. Un nouveau modèle électrique, qui peut être utilisé pour évaluer les structures de protection complexe dont il fait partie, a été développé au cours de cette thèse. Construit avec une forte relation entre les phénomènes physiques et ses équations, il a été parametrisé geometriquement, offrant la possibilité d'adapter et d'optimiser le dispositif selon le niveau de protection nécessaire. Par ailleurs, une étude à haute fréquence sur le SCR et la diode de protection ESD a été réalisé, conduisant à un modèle capable de prédire l'impact de ces dispositifs ont sur le circuit protégé.
Electrostatic discharge (ESD) protection is a must in every integrated circuit. It is done by deploying a network of special devices on-chip, alongside the functional elements. The demand for continuously improvements in ESD design and simulations brings the need of new and more accurate scalable models. The SCR (silicon controlled rectifier) is one of the most efficient ESD protection devices. A new electrical model, that can be used to evaluate the complex protection structures of which it is part of, was developed during this thesis. Built with a strong relation between the physical phenomena and its equations, it was rendered scalable, offering the possibility of tailoring and optimizing the device according to the needed protection level. Moreover, a high-frequency study on the SCR and the ESD protection diode was carried out, leading to a model able to predict the impact these devices have on the protected circuit.
Advisors/Committee Members: Ferrari, Philippe (thesis director), Arnould, Jean-Daniel (thesis director).
Subjects/Keywords: Decharge electrostatique; Modele; Caracterisation; Electrostatic discharge; Device; Modeling; RF; Characterization
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APA (6th Edition):
Romanescu, S. (2011). Modèle compact paramétrable du SCR pour applications ESD et RF : Scalable compact SCR model for ESD&RF applications. (Doctoral Dissertation). Université de Grenoble. Retrieved from http://www.theses.fr/2011GRENT055
Chicago Manual of Style (16th Edition):
Romanescu, Sorin. “Modèle compact paramétrable du SCR pour applications ESD et RF : Scalable compact SCR model for ESD&RF applications.” 2011. Doctoral Dissertation, Université de Grenoble. Accessed March 07, 2021.
http://www.theses.fr/2011GRENT055.
MLA Handbook (7th Edition):
Romanescu, Sorin. “Modèle compact paramétrable du SCR pour applications ESD et RF : Scalable compact SCR model for ESD&RF applications.” 2011. Web. 07 Mar 2021.
Vancouver:
Romanescu S. Modèle compact paramétrable du SCR pour applications ESD et RF : Scalable compact SCR model for ESD&RF applications. [Internet] [Doctoral dissertation]. Université de Grenoble; 2011. [cited 2021 Mar 07].
Available from: http://www.theses.fr/2011GRENT055.
Council of Science Editors:
Romanescu S. Modèle compact paramétrable du SCR pour applications ESD et RF : Scalable compact SCR model for ESD&RF applications. [Doctoral Dissertation]. Université de Grenoble; 2011. Available from: http://www.theses.fr/2011GRENT055
University of Colorado
4.
Ingram, Gabriel J.
Development and Analysis of Volume Multi-Sphere Method Model Generation Using Electric Field Fitting.
Degree: MS, Aerospace Engineering Sciences, 2017, University of Colorado
URL: https://scholar.colorado.edu/asen_gradetds/175
► Electrostatic modeling of spacecraft has wide-reaching applications such as detumbling space debris in the Geosynchronous Earth Orbit regime before docking, servicing and tugging space debris…
(more)
▼ Electrostatic modeling of spacecraft has wide-reaching applications such as detumbling space debris in the Geosynchronous Earth Orbit regime before docking, servicing and tugging space debris to graveyard orbits, and Lorentz augmented orbits. The viability of
electrostatic actuation control applications relies on faster-than-realtime characterization of the
electrostatic interaction. The Volume Multi-Sphere Method (VMSM) seeks the optimal placement and radii of a small number of equipotential spheres to accurately model the
electrostatic force and torque on a conducting space object. Current VMSM models tuned using force and torque comparisons with commercially available finite element software are
subject to the modeled probe size and numerical errors of the software. This work first investigates fitting of VMSM models to Surface-MSM (SMSM) generated electrical field data, removing
modeling dependence on probe geometry while significantly increasing performance and speed. A proposed electric field matching cost function is compared to a force and torque cost function, the inclusion of a self-capacitance constraint is explored and 4 degree-of-freedom VMSM models generated using electric field matching are investigated. The resulting E-field based VMSM development framework is illustrated on a box-shaped hub with a single solar panel, and convergence properties of select models are qualitatively analyzed. Despite the complex non-symmetric spacecraft geometry, elegantly simple 2-sphere VMSM solutions provide force and torque fits within a few percent.
Advisors/Committee Members: Hanspeter Schaub, Daniel Kubitschek, Robert Marshall.
Subjects/Keywords: Electrostatic Modeling; Multi-Sphere Method; spacecraft; space debris; Aerospace Engineering; Space Vehicles
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APA ·
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CSE |
Export
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Manager
APA (6th Edition):
Ingram, G. J. (2017). Development and Analysis of Volume Multi-Sphere Method Model Generation Using Electric Field Fitting. (Masters Thesis). University of Colorado. Retrieved from https://scholar.colorado.edu/asen_gradetds/175
Chicago Manual of Style (16th Edition):
Ingram, Gabriel J. “Development and Analysis of Volume Multi-Sphere Method Model Generation Using Electric Field Fitting.” 2017. Masters Thesis, University of Colorado. Accessed March 07, 2021.
https://scholar.colorado.edu/asen_gradetds/175.
MLA Handbook (7th Edition):
Ingram, Gabriel J. “Development and Analysis of Volume Multi-Sphere Method Model Generation Using Electric Field Fitting.” 2017. Web. 07 Mar 2021.
Vancouver:
Ingram GJ. Development and Analysis of Volume Multi-Sphere Method Model Generation Using Electric Field Fitting. [Internet] [Masters thesis]. University of Colorado; 2017. [cited 2021 Mar 07].
Available from: https://scholar.colorado.edu/asen_gradetds/175.
Council of Science Editors:
Ingram GJ. Development and Analysis of Volume Multi-Sphere Method Model Generation Using Electric Field Fitting. [Masters Thesis]. University of Colorado; 2017. Available from: https://scholar.colorado.edu/asen_gradetds/175
University of Illinois – Urbana-Champaign
5.
Jiang, Rui.
Detection, diagnosis and modeling of ESD-induced soft failures - a gate-level and mixed-signal approach.
Degree: MS, Electrical & Computer Engr, 2017, University of Illinois – Urbana-Champaign
URL: http://hdl.handle.net/2142/98317
► Electronic systems are an indispensable part of people's lives today. However, the reliability of electronic systems can be threatened by external stimuli such as Electrostatic…
(more)
▼ Electronic systems are an indispensable part of people's lives today. However, the reliability of electronic systems can be threatened by external stimuli such as
Electrostatic Discharges (ESDs). ESDs can either physically damage an electronic system or let it malfunction without damaging it. Therefore, a lot of design work and qualification testings are needed by manufacturers to improve the robustness against the negative effects of ESDs. The trial-and-error based solution implementation has incurred huge costs to companies in terms of labor and time. Despite the ever-increasing effort being devoted to solving ESD-related problems, cases of field returns still happen, and a significant portion can be attributed to soft failure induced by system-level ESD. Despite that, the ESD-induced permanent failures are well-studied and protection mechanisms have proven to work, the studies on ESD-induced soft failures are all on the physical and transistor level.
In this thesis, we studied ESD-induced soft failures by first conducting case studies of injecting ESDs into physical devices and observing the application level symptoms of the failures, and then performing simulation-based ESD injections on a well-known instruction-set-architecture. For the first time, we correlated the physical level ESD event to high-level system behavior. We implemented a mixed-signal-simulation-based fault injection environment and device models to allow ESDs to be injected to target systems. By injecting different types of ESDs into the target system, we, for the first time, identified gate-level bit-flip patterns from a SPICE level high-voltage event. Our experimental results show that the extent of register value corruption can be single-bit or widespread, and the bit flips manifested can affect the system in multiple ways. We also demonstrated low-cost protection measures for some of the failures resulted.
Advisors/Committee Members: Vasudevan, Shobha (advisor).
Subjects/Keywords: Electrostatic discharges (ESD); Reliability; Fault modeling; Mixed-signal simulation; Fault injection; Fault detection
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APA ·
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APA (6th Edition):
Jiang, R. (2017). Detection, diagnosis and modeling of ESD-induced soft failures - a gate-level and mixed-signal approach. (Thesis). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/98317
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Jiang, Rui. “Detection, diagnosis and modeling of ESD-induced soft failures - a gate-level and mixed-signal approach.” 2017. Thesis, University of Illinois – Urbana-Champaign. Accessed March 07, 2021.
http://hdl.handle.net/2142/98317.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Jiang, Rui. “Detection, diagnosis and modeling of ESD-induced soft failures - a gate-level and mixed-signal approach.” 2017. Web. 07 Mar 2021.
Vancouver:
Jiang R. Detection, diagnosis and modeling of ESD-induced soft failures - a gate-level and mixed-signal approach. [Internet] [Thesis]. University of Illinois – Urbana-Champaign; 2017. [cited 2021 Mar 07].
Available from: http://hdl.handle.net/2142/98317.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Jiang R. Detection, diagnosis and modeling of ESD-induced soft failures - a gate-level and mixed-signal approach. [Thesis]. University of Illinois – Urbana-Champaign; 2017. Available from: http://hdl.handle.net/2142/98317
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Virginia Tech
6.
Lloyd, Justin Michael.
Electrical Properties of Macro-Fiber Composite Actuators and Sensors.
Degree: MS, Mechanical Engineering, 2004, Virginia Tech
URL: http://hdl.handle.net/10919/10013
► Piezoceramic fiber composite (PFC) actuators and sensors offer many advantages over conventional monolithic piezoceramic devices. Conformable, durable and, when equipped with interdigitated electrodes (IDEs), more…
(more)
▼ Piezoceramic fiber composite (PFC) actuators and sensors offer many advantages over conventional monolithic piezoceramic devices. Conformable, durable and, when equipped with interdigitated electrodes (IDEs), more responsive than regular monolithic devices, PFCs promise to revolutionize the application of piezoelectric materials. Developed by the NASA-Langley Research Center, the Macro-Fiber Composite (MFC) actuator and sensor is the most sophisticated PFC device yet invented. With superior qualities among PFCs in performance, behavior repeatability and manufacturability, the MFC has spawned great interest in the commercial and academic community as a tool in multitudinous engineering applications.
While the MFC's characteristics render it a singularly useful device, limited characterization and
modeling research on the MFC exists. Empirically designed and assembled, the MFC is poorly understood, especially in terms of its underlying operating principles, its dependence on design parameters and its electrical properties. The majority of published MFC studies focus on experimental quantification of MFC mechanical and actuation properties, and the research that attempts to model the MFC relies totally on finite element analysis. Published works widely assume that analytical models of the MFC are totally impossible.
Rectifying gaps in the current body of MFC research, this study presents the first accurate analytical model of the static electrical field properties of the MFC. Implementing the techniques of conformal mapping, a branch of complex analysis, the following chapters derive a closed-form, exact analytical solution describing the electrical potential field and electrical field of the MFC's dual-IDE structure. Based on the conformal mapping solution for the MFC's electrical field, the electrical field of the commercially available MFC is examined and analyzed, introducing an intuitive knowledge of the MFC's operation. Demonstrating the utility of this solution in
modeling the MFC, this work also predicts the capacitance and induced strain properties of a continuum of potential MFC designs and offers final suggestions on improving the current commercial MFC design. After establishing the theoretical underpinnings of the analytical MFC model, this report derives the conformal mapping solutions for the MFC, discusses the computational application of the resulting equations and then presents the results of numerical analyses executed using the new analytical model.
Advisors/Committee Members: Inman, Daniel J. (committeechair), Robertshaw, Harry H. (committee member), Leo, Donald (committee member).
Subjects/Keywords: conformal mapping; capacitance; electrostatic modeling; actuator; MFC
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APA (6th Edition):
Lloyd, J. M. (2004). Electrical Properties of Macro-Fiber Composite Actuators and Sensors. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/10013
Chicago Manual of Style (16th Edition):
Lloyd, Justin Michael. “Electrical Properties of Macro-Fiber Composite Actuators and Sensors.” 2004. Masters Thesis, Virginia Tech. Accessed March 07, 2021.
http://hdl.handle.net/10919/10013.
MLA Handbook (7th Edition):
Lloyd, Justin Michael. “Electrical Properties of Macro-Fiber Composite Actuators and Sensors.” 2004. Web. 07 Mar 2021.
Vancouver:
Lloyd JM. Electrical Properties of Macro-Fiber Composite Actuators and Sensors. [Internet] [Masters thesis]. Virginia Tech; 2004. [cited 2021 Mar 07].
Available from: http://hdl.handle.net/10919/10013.
Council of Science Editors:
Lloyd JM. Electrical Properties of Macro-Fiber Composite Actuators and Sensors. [Masters Thesis]. Virginia Tech; 2004. Available from: http://hdl.handle.net/10919/10013
7.
Lad, Ankit Raghunath.
Flow Modeling for Micro-filtration through electro-statically charged monolith filters.
Degree: MS, Mechanical Engineering, 2009, North Carolina State University
URL: http://www.lib.ncsu.edu/resolver/1840.16/2120
► LAD, ANKIT RAGHUNATH. Flow Modeling for Micro-filtration through electro-statically charged monolith filters. (Under the direction of Dr. Andrey V. Kuznetsov.) This study is a multi-physics…
(more)
▼ LAD, ANKIT RAGHUNATH. Flow
Modeling for Micro-filtration through electro-statically charged monolith filters. (Under the direction of Dr. Andrey V. Kuznetsov.)
This study is a multi-physics problem which aims at
modeling fluid flow through electro-statically charged monolith filters with machined micro-channels. The multi-phase fluid (air) considered has suspended micro particles which are the impurities to be filtered out. The resulting particle trajectories due to the effect of the forces exerted on the particle such as the hydrodynamic drag, the
electrostatic force of attraction and repulsion and Brownian diffusion are studied. The micro-filtration process is studied under the presence of an electric field developed due to the uniform density charge distributed over the channel surface. The model is validated by comparison with the experimental result. The advantage of using repulsive electric field instead of attractive electric field for filtration is studied. The unit cell filtration system is developed for normal and cross flow and the scope for efficiency improvement is tested. The possibility of ‘selective filtration’ is examined by using the multiple filter layer model and the role of different hole-orientation pattern is also studied. The experimental setup of the filtration system and the filter material strength for practical applications is discussed.
Advisors/Committee Members: Dr. Andrey V. Kuznetsov, Committee Chair (advisor), Dr. William Roberts, Committee Member (advisor), Dr. Jack Edwards, Committee Member (advisor).
Subjects/Keywords: modeling; filtration; filter; electrostatic; fluid; particle; simulation; monolith; efficiency
…following the fluid streamlines ..
57
Figure 4.1.3
Electrostatic Force of attraction and… …captured due to ‘interception’. The
2
effect of the ‘electrostatic’ force of attraction on the… …network of
irregular quasi-elliptic shaped holes. Modeling the flow through them is done by… …FD ) of the fluid, the electrostatic force ( FE ) of attraction or repulsion… …Electrostatic Force:
The electrostatic force ( FE ) is given by the product of charge (…
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APA ·
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APA (6th Edition):
Lad, A. R. (2009). Flow Modeling for Micro-filtration through electro-statically charged monolith filters. (Thesis). North Carolina State University. Retrieved from http://www.lib.ncsu.edu/resolver/1840.16/2120
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Lad, Ankit Raghunath. “Flow Modeling for Micro-filtration through electro-statically charged monolith filters.” 2009. Thesis, North Carolina State University. Accessed March 07, 2021.
http://www.lib.ncsu.edu/resolver/1840.16/2120.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Lad, Ankit Raghunath. “Flow Modeling for Micro-filtration through electro-statically charged monolith filters.” 2009. Web. 07 Mar 2021.
Vancouver:
Lad AR. Flow Modeling for Micro-filtration through electro-statically charged monolith filters. [Internet] [Thesis]. North Carolina State University; 2009. [cited 2021 Mar 07].
Available from: http://www.lib.ncsu.edu/resolver/1840.16/2120.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Lad AR. Flow Modeling for Micro-filtration through electro-statically charged monolith filters. [Thesis]. North Carolina State University; 2009. Available from: http://www.lib.ncsu.edu/resolver/1840.16/2120
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Colorado
8.
Stevenson, Daan.
Remote Spacecraft Attitude Control by Coulomb Charging.
Degree: PhD, Aerospace Engineering Sciences, 2015, University of Colorado
URL: https://scholar.colorado.edu/asen_gradetds/94
► The possibility of inter-spacecraft collisions is a serious concern at Geosynchronous altitudes, where many high-value assets operate in proximity to countless debris objects whose…
(more)
▼ The possibility of inter-spacecraft collisions is a serious concern at Geosynchronous altitudes, where many high-value assets operate in proximity to countless debris objects whose orbits experience no natural means of decay. The ability to rendezvous with these derelict satellites would enable active debris removal by servicing or repositioning missions, but docking procedures are generally inhibited by the large rotational momenta of uncontrolled satellites. Therefore, a contactless means of reducing the rotation rate of objects in the space environment is desired. This dissertation investigates the viability of Coulomb charging to achieve such remote spacecraft attitude control. If a servicing craft imposes absolute electric potentials on a nearby nonspherical debris object, it will impart
electrostatic torques that can be used to gradually arrest the object's rotation.
In order to simulate the relative motion of charged spacecraft with complex geometries, accurate but rapid knowledge of the Coulomb interactions is required. To this end, a new
electrostatic force model called the Multi-Sphere Method (MSM) is developed. All aspects of the Coulomb de-spin concept are extensively analyzed and simulated using a system with simplified geometries and one dimensional rotation. First, appropriate control algorithms are developed to ensure that the nonlinear Coulomb torques arrest the rotation with guaranteed stability. Moreover, the complex interaction of the spacecraft with the plasma environment and charge control beams is modeled to determine what hardware requirements are necessary to achieve the desired electric potential levels. Lastly, the attitude dynamics and feedback control development is validated experimentally using a scaled down terrestrial testbed. High voltage power supplies control the potential on two nearby conductors, a stationary sphere and a freely rotating cylinder. The nonlinear feedback control algorithms developed above are implemented to achieve rotation rate and absolute attitude control. Collectively, these studies decisively validate the feasibility of Coulomb charging for remote spacecraft attitude control.
Advisors/Committee Members: Hanspeter Schaub, Webster Cash, Brandon Jones, Daniel Moorer, Zoltan Sternovsky.
Subjects/Keywords: electrostatic modeling; high voltage experimentation; spacecraft attitude control; spacecraft charging; Multi-Vehicle Systems and Air Traffic Control; Navigation, Guidance, Control and Dynamics; Space Vehicles
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APA (6th Edition):
Stevenson, D. (2015). Remote Spacecraft Attitude Control by Coulomb Charging. (Doctoral Dissertation). University of Colorado. Retrieved from https://scholar.colorado.edu/asen_gradetds/94
Chicago Manual of Style (16th Edition):
Stevenson, Daan. “Remote Spacecraft Attitude Control by Coulomb Charging.” 2015. Doctoral Dissertation, University of Colorado. Accessed March 07, 2021.
https://scholar.colorado.edu/asen_gradetds/94.
MLA Handbook (7th Edition):
Stevenson, Daan. “Remote Spacecraft Attitude Control by Coulomb Charging.” 2015. Web. 07 Mar 2021.
Vancouver:
Stevenson D. Remote Spacecraft Attitude Control by Coulomb Charging. [Internet] [Doctoral dissertation]. University of Colorado; 2015. [cited 2021 Mar 07].
Available from: https://scholar.colorado.edu/asen_gradetds/94.
Council of Science Editors:
Stevenson D. Remote Spacecraft Attitude Control by Coulomb Charging. [Doctoral Dissertation]. University of Colorado; 2015. Available from: https://scholar.colorado.edu/asen_gradetds/94
University of Illinois – Urbana-Champaign
9.
Sumant, Prasad S.
Stochastic multiphysics modeling of RF MEMS switches.
Degree: PhD, 0133, 2010, University of Illinois – Urbana-Champaign
URL: http://hdl.handle.net/2142/16113
► Micro-Electro-Mechanical (MEM) devices like switches, varactors and oscillators have shown great potential for use in communication devices, sensors and actuators. Electrostatically actuated switches in particular…
(more)
▼ Micro-Electro-Mechanical (MEM) devices like switches, varactors and oscillators have shown great potential for use in communication devices, sensors and actuators. Electrostatically actuated switches in particular have been shown to have superior performance characteristics over traditional semiconductor switches. However, their widespread insertion in integrated electronics is critically dependent on a thorough understanding of two broad issues - manufacturing process variations and failure mechanisms. Variations during fabrication lead to uncertain material and/or geometric parameters causing a significant impact on device performance. Such uncertainties need to be accounted for during the robust design of these switches. In terms of failure mechanisms limiting the lifetime of MEMS switches, dielectric charging is considered to be the most critical. It can cause the switch to either remain stuck after removal of the actuation voltage or to fail to contact under application of voltage. There is a need for accurate and computationally efficient, multi-physics CAD tools for incorporating the effect of dielectric charging.
In this work, we have attempted to address some of the aforementioned challenges. We have come up with new algorithms for improving the effciency of coupled electro-mechanical simulations done in existing commercially available software like ANSYS. The gains in efficiency are accomplished through eliminating the need for repeated mesh update or re-meshing during finite element
electrostatic modeling. This is achieved through the development of a `map' between the deformed and un-deformed geometries. Thus only one finite element discretization on the original undeformed geometry is needed for performing
electrostatic analysis on all subsequent deformed geometries. We have generalized this concept of `mapping' to perform stochastic
electrostatic analysis in the presence of geometric uncertainties. The different random realizations of geometry are considered as deformed geometries. The
electrostatic problem on each of these random samples is then obtained using the `mapping' and the finite element simulation on the mean geometry. Statistics such as the mean and standard deviation of the desired system response such as capacitance and vertical force are efficiently computed. This approach has been shown to be orders of magnitude faster than standard Monte Carlo approaches.
Next, we have developed a methodology for the model order reduction of MEMS devices under random input conditions to facilitate fast time and frequency domain analyses. In this approach, the system matrices are represented in terms of polynomial expansions of input random variables. The coefficients of these polynomials are obtained by deterministic model order reduction for specific values of the input random variables. These values are chosen `smartly' using a Smolyak algorithm. The stochastic reduced order model is cast in the form of an augmented, deterministic system. The proposed method provides significant efficiency…
Advisors/Committee Members: Aluru, Narayana R. (advisor), Cangellaris, Andreas C. (advisor), Aluru, Narayana R. (Committee Chair), Cangellaris, Andreas C. (committee member), Geubelle, Philippe H. (committee member), Ravaioli, Umberto (committee member).
Subjects/Keywords: Microelectromechanical systems (MEMS); Modeling; Dielectric charging; Stochastic; Finite element; Model order reduction; Multi-physics; switches; electrostatic
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APA (6th Edition):
Sumant, P. S. (2010). Stochastic multiphysics modeling of RF MEMS switches. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/16113
Chicago Manual of Style (16th Edition):
Sumant, Prasad S. “Stochastic multiphysics modeling of RF MEMS switches.” 2010. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed March 07, 2021.
http://hdl.handle.net/2142/16113.
MLA Handbook (7th Edition):
Sumant, Prasad S. “Stochastic multiphysics modeling of RF MEMS switches.” 2010. Web. 07 Mar 2021.
Vancouver:
Sumant PS. Stochastic multiphysics modeling of RF MEMS switches. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2010. [cited 2021 Mar 07].
Available from: http://hdl.handle.net/2142/16113.
Council of Science Editors:
Sumant PS. Stochastic multiphysics modeling of RF MEMS switches. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2010. Available from: http://hdl.handle.net/2142/16113
University of Cincinnati
10.
Mahankali, Uma.
Computer Simulation Studies of CLC Chloride Channels and
Transporters.
Degree: PhD, Arts and Sciences : Chemistry, 2006, University of Cincinnati
URL: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1157115905
► In this dissertation, the CLC family of chloride channels and transporters are discussed with respect to their structure-function relationships. Here, we report the results from…
(more)
▼ In this dissertation, the CLC family of chloride
channels and transporters are discussed with respect to their
structure-function relationships. Here, we report the results from
our computer simulation studies of the CLC proteins. We built
homology models of four CLC proteins ClC-0, ClC-2, ClC-4 and ClC-5.
These structures were validated and energy minimized to obtain
working models for further simulations.
Electrostatic calculations
of the bacterial CLC homologue are presented, including the
investigations on the effects of different parameters on the pKa
shifts of a key glutamate residue. This residue was identified as a
gate in the CLC channels and external proton-transfer residue in
the CLC transporters. We found that the presence of three binding
site chloride ions in the pore was required to shift the pKa of the
glutamate residue up into a physiological pH range. The calculated
pKa shifts were highly sensitive to the dielectric constant of the
protein. Free energy barriers for the gate opening in bacterial CLC
structure were estimated in protonated and unprotonated states of
the side chain of the gate, Glu148. Further, the effect of chloride
ions in the vicinity of the Glu148 was also examined. These
computer simulations provide important tools for the ongoing
studies into the structure-function relationships in CLC channels
and transporters.
Advisors/Committee Members: Beck, Dr. Thomas (Advisor).
Subjects/Keywords: CLC Chloride Channels; CLC transporters; Adaptive biasing force; electrostatic calculations; homology modeling; fast gating in CLC
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APA (6th Edition):
Mahankali, U. (2006). Computer Simulation Studies of CLC Chloride Channels and
Transporters. (Doctoral Dissertation). University of Cincinnati. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=ucin1157115905
Chicago Manual of Style (16th Edition):
Mahankali, Uma. “Computer Simulation Studies of CLC Chloride Channels and
Transporters.” 2006. Doctoral Dissertation, University of Cincinnati. Accessed March 07, 2021.
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1157115905.
MLA Handbook (7th Edition):
Mahankali, Uma. “Computer Simulation Studies of CLC Chloride Channels and
Transporters.” 2006. Web. 07 Mar 2021.
Vancouver:
Mahankali U. Computer Simulation Studies of CLC Chloride Channels and
Transporters. [Internet] [Doctoral dissertation]. University of Cincinnati; 2006. [cited 2021 Mar 07].
Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1157115905.
Council of Science Editors:
Mahankali U. Computer Simulation Studies of CLC Chloride Channels and
Transporters. [Doctoral Dissertation]. University of Cincinnati; 2006. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1157115905
11.
Kieslich, Chris A.
Development and Applications of a Computational Framework for Protein and Drug Design.
Degree: Bioengineering, 2012, University of California – Riverside
URL: http://www.escholarship.org/uc/item/6p31w1xs
► Interactions between biomolecules are essential to biological function, and fundamentally understanding the forces that drives these interactions is of great medical importance. Molecular modeling approaches…
(more)
▼ Interactions between biomolecules are essential to biological function, and fundamentally understanding the forces that drives these interactions is of great medical importance. Molecular modeling approaches represent a powerful set of tools for gaining a mechanistic perspective of biomolecular interactions at the atomic level. Due to the complexities of biological environments, a diverse set of molecular modeling methods are often needed to capture various aspects of biomolecular function. Here we present a computational framework that utilizes established molecular modeling methods, such as molecular dynamics, Poisson-Boltzmann electrostatics, and small-molecule docking, as well as includes novel tools for elucidating the role of electrostatics in protein association. Our novel computational tool, Analysis of Electrostatics Similarity Of Proteins (AESOP), utilizes theoretical mutagenesis, electrostatic clustering, and electrostatic free energies of association to evaluate the role of each charged residue in protein association. The AESOP framework has been applied to various biomolecular systems, including barnase-bartstar, the gold-standard system for protein electrostatics, as well as for the successful design of novel SUMO-4 substrate analogs. One biological system that is of key interest is the complement immune system, which is an ancient component of innate immunity. The complement system is involved in the opsonization and clearance of foreign pathogens, and achieves its function through a cascade of protein-protein interactions largely driven by electrostatics. The key role of electrostatics in complement function is further evidenced by the existence of electrostatic "hot-spots" on the surface of complement proteins, and by the fact that pathogens utilize electrostatics in complement targeted evasion mechanisms. Over-activation of the complement system is implicated in numerous autoimmune and inflammatory diseases, and as a result anaphylatoxin receptor C5aR has become an important drug target. We have developed a conformationally-sampled pharmacophore model for known C5aR antagonists, which has utility in the design/evaluation of novel C5aR antagonists. We have also performed virtual screening based on a newly developed model of the interaction between C5aR and known potent antagonist PMX-53, and have identified a structurally diverse set of potential C5aR ligands. These studies define a computational framework that has utility in the analysis of many other protein targets.
Subjects/Keywords: Biomedical engineering; Biophysics; Bioinformatics; Complement receptor C5aR; Complement System; Electrostatics calculations; Electrostatic similarity; Molecular modeling; Protein and drug design
…interactions! is! of! great! medical!
importance.! Molecular! modeling! approaches! represent! a… …diverse!set!of!molecular!modeling!methods!are!often!
needed!to!capture!various!aspects!of… …modeling!methods,!such!as!molecular!dynamics,!
Poisson\Boltzmann!electrostatics,!and!small… …electrostatic! clustering,! and! electrostatic! free! energies! of! association! to! evaluate! the… …further! evidenced! by! the! existence! of! electrostatic! “hot\spots”! on! the! surface…
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APA (6th Edition):
Kieslich, C. A. (2012). Development and Applications of a Computational Framework for Protein and Drug Design. (Thesis). University of California – Riverside. Retrieved from http://www.escholarship.org/uc/item/6p31w1xs
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Kieslich, Chris A. “Development and Applications of a Computational Framework for Protein and Drug Design.” 2012. Thesis, University of California – Riverside. Accessed March 07, 2021.
http://www.escholarship.org/uc/item/6p31w1xs.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Kieslich, Chris A. “Development and Applications of a Computational Framework for Protein and Drug Design.” 2012. Web. 07 Mar 2021.
Vancouver:
Kieslich CA. Development and Applications of a Computational Framework for Protein and Drug Design. [Internet] [Thesis]. University of California – Riverside; 2012. [cited 2021 Mar 07].
Available from: http://www.escholarship.org/uc/item/6p31w1xs.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Kieslich CA. Development and Applications of a Computational Framework for Protein and Drug Design. [Thesis]. University of California – Riverside; 2012. Available from: http://www.escholarship.org/uc/item/6p31w1xs
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
12.
Ulmen, Benjamin.
Formation and extraction of a dense plasma jet from a helicon-plasma-injected inertial electrostatic confinement device.
Degree: PhD, 0139, 2014, University of Illinois – Urbana-Champaign
URL: http://hdl.handle.net/2142/46687
► An inertial electrostatic confinement (IEC) device has several pressure and grid-geometry dependent modes of operation for the confinement of plasma. Although the symmetric grid star-mode…
(more)
▼ An inertial
electrostatic confinement (IEC) device has several pressure and grid-geometry dependent modes of operation for the confinement of plasma. Although the symmetric grid star-mode is the most often studied for its application to fusion, the asymmetric grid jet-mode has its own potential application for electric space propulsion. The jet-mode gets its name from the characteristic bright plasma jet emanating from the central grid. In this dissertation work, a full study was undertaken to provide an understanding on the formation and propagation of the IEC plasma jet-mode.
The IEC device vacuum system and all diagnostics were custom assembled during this work. Four diagnostics were used to measure different aspects of the jet. A spherical plasma probe was used to explore the coupling of an external helicon plasma source to the IEC device. The plasma current in the jet was measured by a combination of a Faraday cup and a gridded energy analyzer (GEA). The Faraday cup also included a temperature sensor for collection of thermal power measurements used to compute the efficiency of the IEC device in coupling power into the jet. The GEA allowed for measurement of the electron energy spectra. The force provided by the plasma jet was measured using a piezoelectric force sensor. Each of these measurements provided an important window into the nature of the plasma jet. COMSOL simulations provided additional evidence needed to create a model to explain the formation of the jet.
It will be shown that the jet consists of a high energy electron beam having a peak energy of approximately half of the full grid potential. It is born near the aperture of the grid as a result of the escaping core electrons. Several other attributes of the plasma jet will be presented as well as a way forward to utilizing this device and operational mode for future plasma space propulsion.
Advisors/Committee Members: Miley, George H. (advisor), Miley, George H. (Committee Chair), Eden, James G. (committee member), Ruzic, David N. (committee member), Stubbins, James F. (committee member), Marsh, Charles P. (committee member).
Subjects/Keywords: Inertial Electrostatic Confinement (IEC); Plasma; Jet-Model; Gridded Energy Analyzer; Piezoelectric Force Sensor; Faraday Cup; COMSOL Modeling
…electrostatic confinement (IEC) of plasma has shown great
promise in a variety of… …applications as a result of its simple design and ability to confine plasma
using only electrostatic… …Figure 1. The simple spherical inertial electrostatic confinement (IEC) configuration… …the
Helicon-Injected Inertial Plasma Electrostatic Rocket (HIIPER). HIIPER is a… …inertial electrostatic confinement device. They are a
glow discharge, electron-emitter assisted…
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APA (6th Edition):
Ulmen, B. (2014). Formation and extraction of a dense plasma jet from a helicon-plasma-injected inertial electrostatic confinement device. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/46687
Chicago Manual of Style (16th Edition):
Ulmen, Benjamin. “Formation and extraction of a dense plasma jet from a helicon-plasma-injected inertial electrostatic confinement device.” 2014. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed March 07, 2021.
http://hdl.handle.net/2142/46687.
MLA Handbook (7th Edition):
Ulmen, Benjamin. “Formation and extraction of a dense plasma jet from a helicon-plasma-injected inertial electrostatic confinement device.” 2014. Web. 07 Mar 2021.
Vancouver:
Ulmen B. Formation and extraction of a dense plasma jet from a helicon-plasma-injected inertial electrostatic confinement device. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2014. [cited 2021 Mar 07].
Available from: http://hdl.handle.net/2142/46687.
Council of Science Editors:
Ulmen B. Formation and extraction of a dense plasma jet from a helicon-plasma-injected inertial electrostatic confinement device. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2014. Available from: http://hdl.handle.net/2142/46687
Georgia Tech
13.
Taboada-Serrano, Patricia Larisse.
Colloidal Interactions in Aquatic Environments: Effect of Charge Heterogeneity and Charge Asymmetry.
Degree: PhD, Civil and Environmental Engineering, 2005, Georgia Tech
URL: http://hdl.handle.net/1853/7521
► The classical theory of colloids and surface science has universally been applied in modeling and calculations involving solid-liquid interfaces encountered in natural and engineered environments.…
(more)
▼ The classical theory of colloids and surface science has universally been applied in
modeling and calculations involving solid-liquid interfaces encountered in natural and engineered environments. However, several discrepancies between the observed behavior of charged solid-liquid interfaces and predictions by classical theory have been reported in the past decades. The hypothesis that the mean-field, pseudo-one-component approximation adopted within the framework of the classical theory is responsible for the differences observed is tested in this work via the application of
modeling and experimental techniques at a molecular level. Silica and silicon nitride are selected as model charged solid surfaces, and mixtures of symmetric and asymmetric indifferent and non-indifferent electrolytes are used as liquid phases.
Canonical Monte Carlo simulations (CMC) of the electrical double layer (EDL) structure of a discretely charged planar silica surface, embedded in solutions of indifferent electrolytes, reveal the presence of a size exclusion effect that is enhanced at larger values of surface charge densities. That effect translates into an unexpected behavior of the interaction forces between a charged planar surface and a spherical particle. CMC simulations of the
electrostatic interactions and calculations of the EDL force between a spherical particle and a planar surface, similarly charged, reveal the presence of two attractive force components: a depletion effect almost at contact and a long-range attractive force of
electrostatic origin due to ion-ion correlation effects. Those two-force components result from the consideration of discreteness of charge in the interaction of solid-liquid interfaces, and they contradict the classical theory predictions of
electrostatic repulsive interaction between similarly charged surfaces. Direct interaction force measurements between a charged planar surface and a colloidal particle, performed by atomic force microscopy (AFM), reveal that, when indifferent and non-indifferent electrolytes are present in solution, surface charge modification occurs in addition to the effects on the EDL behavior reported for indifferent electrolytes. Non-uniformity and even heterogeneity of surface charge are detected due to the action of non-indifferent, asymmetric electrolytes.
The phenomena observed explain the differences between the classical theory predictions and the experimental observations reported in the open literature, validating the hypothesis of this work.
Advisors/Committee Members: Yiacoumi, Sotira (Committee Chair), Tsouris, Costas (Committee Co-Chair), Pavlostathis, Spyros (Committee Member), Sherrill, David (Committee Member), Tannenbaum, Rina (Committee Member).
Subjects/Keywords: Charged colloids; Solid interfaces; Electrostatic interactions; Electrical double layer; Surface charge; Molecular modeling; Solid-liquid interfaces; Surface chemistry; Aquatic ecology; Colloids; Electric double layer; Electrostatics
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APA (6th Edition):
Taboada-Serrano, P. L. (2005). Colloidal Interactions in Aquatic Environments: Effect of Charge Heterogeneity and Charge Asymmetry. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/7521
Chicago Manual of Style (16th Edition):
Taboada-Serrano, Patricia Larisse. “Colloidal Interactions in Aquatic Environments: Effect of Charge Heterogeneity and Charge Asymmetry.” 2005. Doctoral Dissertation, Georgia Tech. Accessed March 07, 2021.
http://hdl.handle.net/1853/7521.
MLA Handbook (7th Edition):
Taboada-Serrano, Patricia Larisse. “Colloidal Interactions in Aquatic Environments: Effect of Charge Heterogeneity and Charge Asymmetry.” 2005. Web. 07 Mar 2021.
Vancouver:
Taboada-Serrano PL. Colloidal Interactions in Aquatic Environments: Effect of Charge Heterogeneity and Charge Asymmetry. [Internet] [Doctoral dissertation]. Georgia Tech; 2005. [cited 2021 Mar 07].
Available from: http://hdl.handle.net/1853/7521.
Council of Science Editors:
Taboada-Serrano PL. Colloidal Interactions in Aquatic Environments: Effect of Charge Heterogeneity and Charge Asymmetry. [Doctoral Dissertation]. Georgia Tech; 2005. Available from: http://hdl.handle.net/1853/7521
University of Central Florida
14.
Lou, Lifang.
Design, Characterization And Compact Modeling Of Novel Silicon Controlled Rectifier (scr)-based Devices For Electrostatic Discha.
Degree: 2008, University of Central Florida
URL: https://stars.library.ucf.edu/etd/3597
► Electrostatic Discharge (ESD), an event of a sudden transfer of electrons between two bodies at different potentials, happens commonly throughout nature. When such even occurs…
(more)
▼ Electrostatic Discharge (ESD), an event of a sudden transfer of electrons between two bodies at different potentials, happens commonly throughout nature. When such even occurs on integrated circuits (ICs), ICs will be damaged and failures result. As the evolution of semiconductor technologies, increasing usage of automated equipments and the emerging of more and more complex circuit applications, ICs are more sensitive to ESD strikes. Main ESD events occurring in semiconductor industry have been standardized as human body model (HBM), machine model (MM), charged device model (CDM) and international electrotechnical commission model (IEC) for control, monitor and test. In additional to the environmental control of ESD events during manufacturing, shipping and assembly, incorporating on-chip ESD protection circuits inside ICs is another effective solution to reduce the ESD-induced damage. This dissertation presents design, characterization, integration and compact
modeling of novel silicon controlled rectifier (SCR)-based devices for on-chip ESD protection. The SCR-based device with a snapback characteristic has long been used to form a VSS-based protection scheme for on-chip ESD protection over a broad rang of technologies because of its low on-resistance, high failure current and the best area efficiency. The ESD design window of the snapback device is defined by the maximum power supply voltage as the low edge and the minimum internal circuitry breakdown voltage as the high edge. The downscaling of semiconductor technology keeps on squeezing the design window of on-chip ESD protection. For the submicron process and below, the turn-on voltage and sustain voltage of ESD protection cell should be lower than 10 V and higher than 5 V, respectively, to avoid core circuit damages and latch-up issue. This presents a big challenge to device/circuit engineers. Meanwhile, the high voltage technologies push the design window to another tough range whose sustain voltage, 45 V for instance, is hard for most snapback ESD devices to reach. Based on the in-depth elaborating on the principle of SCR-based devices, this dissertation first presents a novel unassisted, low trigger- and high holding-voltage SCR (uSCR) which can fit into the aforesaid ESD design window without involving any extra assistant circuitry to realize an area-efficient on-chip ESD protection for low voltage applications. The on-chip integration case is studied to verify the protection effectiveness of the design. Subsequently, this dissertation illustrate the development of a new high holding current SCR (HHC-SCR) device for high voltage ESD protection with increasing the sustain current, not the sustain voltage, of the SCR device to the latchup-immune level to avoid sacrificing the ESD protection robustness of the device. The ESD protection cells have been designed either by using technology computer aided design (TCAD) tools or through trial-and-error iterations, which is cost- or time-consuming or both. Also, the interaction of ESD protection cells and core…
Advisors/Committee Members: Liou, Juin J..
Subjects/Keywords: Electrostatic Discharge (ESD); Silicon Controlled Rectifier (SCR); Charged Device Model (CDM); Compact Modeling; Low Trigger Voltage; High Holding Current.; Electrical and Computer Engineering; Electrical and Electronics; Engineering
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APA (6th Edition):
Lou, L. (2008). Design, Characterization And Compact Modeling Of Novel Silicon Controlled Rectifier (scr)-based Devices For Electrostatic Discha. (Doctoral Dissertation). University of Central Florida. Retrieved from https://stars.library.ucf.edu/etd/3597
Chicago Manual of Style (16th Edition):
Lou, Lifang. “Design, Characterization And Compact Modeling Of Novel Silicon Controlled Rectifier (scr)-based Devices For Electrostatic Discha.” 2008. Doctoral Dissertation, University of Central Florida. Accessed March 07, 2021.
https://stars.library.ucf.edu/etd/3597.
MLA Handbook (7th Edition):
Lou, Lifang. “Design, Characterization And Compact Modeling Of Novel Silicon Controlled Rectifier (scr)-based Devices For Electrostatic Discha.” 2008. Web. 07 Mar 2021.
Vancouver:
Lou L. Design, Characterization And Compact Modeling Of Novel Silicon Controlled Rectifier (scr)-based Devices For Electrostatic Discha. [Internet] [Doctoral dissertation]. University of Central Florida; 2008. [cited 2021 Mar 07].
Available from: https://stars.library.ucf.edu/etd/3597.
Council of Science Editors:
Lou L. Design, Characterization And Compact Modeling Of Novel Silicon Controlled Rectifier (scr)-based Devices For Electrostatic Discha. [Doctoral Dissertation]. University of Central Florida; 2008. Available from: https://stars.library.ucf.edu/etd/3597
15.
Lavergne, Thomas.
Modélisation analytique et caractérisation expérimentale de microphones capacitifs en hautes fréquences : étude des couches limites thermiques, effets des perforations de l’électrode arrière sur la déformée de membrane : Analytical modeling and experimental characterisation of condenser microphones at high frequencies : analysis of the thermal boundary layers, effects of holes in the backing electrode on the displacement field of the membrane.
Degree: Docteur es, Acoustique, 2011, Le Mans
URL: http://www.theses.fr/2011LEMA1020
► Les microphones capacitifs sont des transducteurs réciproques dont les qualités (sensibilité, bande passante et tenue dans le temps) en font des instruments de mesure performants.…
(more)
▼ Les microphones capacitifs sont des transducteurs réciproques dont les qualités (sensibilité, bande passante et tenue dans le temps) en font des instruments de mesure performants. Couramment utilisés jusqu’à présent en récepteurs dans l’air à pression atmosphérique et à température ambiante, dans la gamme de fréquences audibles, ils sont correctement caractérisés dans ce cadre depuis près de trente ans. Mais aujourd’hui, leur miniaturisation (par procédé MEMS) et leur usage nouveau en métrologie fine (en récepteurs comme en émetteurs) - qui exigent une connaissance précise de leur comportement dans des domaines de fréquences élevées (jusqu’à 100 kHz), dans des mélanges gazeux aux propriétés différentes de celles de l’air et dans des conditions de pression et de température beaucoup plus élevées ou beaucoup plus basses que les conditions standards - nécessitent une caractérisation beaucoup plus approfondie, aussi bien en terme de modélisation qu’en terme de résultats expérimentaux. C’est ainsi que ici -i/ les effets des couches limites thermiques (seules les couches limites visqueuses sont habituellement retenues) sont introduits dans le modèle, ce qui amène dans le chapitre premier à une étude analytique de la diffusion thermique en parois minces (dont la portée dépasse le cadre strict du transducteur), -ii/ l’influence des orifices de l’électrode arrière sur la déformée de la membrane est traitée au départ par une méthode analytique originale, qui permet de traduire les conditions en frontière non uniformes sur la surface de l’électrode sous forme de sources locales virtuelles, associées à des conditions de frontière rendues uniformes (chapitre second), -iii/ des solutions analytiques nouvelles, dépendant à la fois des coordonnées radiales et azimutales, sont obtenues pour le champ de déplacement de la membrane et pour les champs de pression dans les cavités du microphone par usage de théories modales compatibles avec les couplages multiples qui y prennent place (troisième chapitre), -iv/ un modèle de « circuit à constantes localisées » (reporté pour l’essentiel en annexe) est proposé, à des degrés divers de précision, qui permet en particulier d’accéder de façon simple à la sensibilité et au bruit thermique du microphone (fin du quatrième chapitre), -v/ une étude au vibromètre laser à balayage a été réalisée (début du quatrième chapitre), qui permet non seulement de mettre en évidence pour la première fois les déformées de membrane complexes qui apparaissent en hautes fréquences, mais encore de les quantifier et par-delà de valider les résultats théoriques obtenus et donc les modèles proposés (même s’ils restent perfectibles comme indiqué dans la conclusion).
Condenser microphones are reciprocal transducers whose properties (sensitivity, bandwidth and reliability) make them powerful measurement tools. So far, they have been commonly used as receivers in the audible frequency range, in air at atmospheric pressure and ambient temperature, they have been appropriately characterised in this context for nearly thirty…
Advisors/Committee Members: Joly, Nicolas (thesis director), Durand, Stéphane (thesis director).
Subjects/Keywords: Modélisation analytique; Microphone capacitif réciproque; Transducteur électrostatique; Fluide thermovisqueux; Couches limites thermique et visqueuse; Admittance spécifique équivalente; Conditions aux frontières inhomogènes; Développement modal; Sensibilité; Bruit thermo-mécanique; Circuit électrique équivalent; Vibromètre laser à balayage; Analytical modeling; Reciprocal condenser microphone; Electrostatic transducer; Thermoviscous fluid; Thermal and viscous boundary layers; Specific acoustic admittance; Inhomogenous boundary conditions; Modal expansion; Sensitivity; Mechanical-thermal moise; Mechanical equivalent circuit; Laser scanning vibrometer
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APA (6th Edition):
Lavergne, T. (2011). Modélisation analytique et caractérisation expérimentale de microphones capacitifs en hautes fréquences : étude des couches limites thermiques, effets des perforations de l’électrode arrière sur la déformée de membrane : Analytical modeling and experimental characterisation of condenser microphones at high frequencies : analysis of the thermal boundary layers, effects of holes in the backing electrode on the displacement field of the membrane. (Doctoral Dissertation). Le Mans. Retrieved from http://www.theses.fr/2011LEMA1020
Chicago Manual of Style (16th Edition):
Lavergne, Thomas. “Modélisation analytique et caractérisation expérimentale de microphones capacitifs en hautes fréquences : étude des couches limites thermiques, effets des perforations de l’électrode arrière sur la déformée de membrane : Analytical modeling and experimental characterisation of condenser microphones at high frequencies : analysis of the thermal boundary layers, effects of holes in the backing electrode on the displacement field of the membrane.” 2011. Doctoral Dissertation, Le Mans. Accessed March 07, 2021.
http://www.theses.fr/2011LEMA1020.
MLA Handbook (7th Edition):
Lavergne, Thomas. “Modélisation analytique et caractérisation expérimentale de microphones capacitifs en hautes fréquences : étude des couches limites thermiques, effets des perforations de l’électrode arrière sur la déformée de membrane : Analytical modeling and experimental characterisation of condenser microphones at high frequencies : analysis of the thermal boundary layers, effects of holes in the backing electrode on the displacement field of the membrane.” 2011. Web. 07 Mar 2021.
Vancouver:
Lavergne T. Modélisation analytique et caractérisation expérimentale de microphones capacitifs en hautes fréquences : étude des couches limites thermiques, effets des perforations de l’électrode arrière sur la déformée de membrane : Analytical modeling and experimental characterisation of condenser microphones at high frequencies : analysis of the thermal boundary layers, effects of holes in the backing electrode on the displacement field of the membrane. [Internet] [Doctoral dissertation]. Le Mans; 2011. [cited 2021 Mar 07].
Available from: http://www.theses.fr/2011LEMA1020.
Council of Science Editors:
Lavergne T. Modélisation analytique et caractérisation expérimentale de microphones capacitifs en hautes fréquences : étude des couches limites thermiques, effets des perforations de l’électrode arrière sur la déformée de membrane : Analytical modeling and experimental characterisation of condenser microphones at high frequencies : analysis of the thermal boundary layers, effects of holes in the backing electrode on the displacement field of the membrane. [Doctoral Dissertation]. Le Mans; 2011. Available from: http://www.theses.fr/2011LEMA1020
16.
Meng, Kuo-Hsuan.
Modeling and simulation of full-component integrated circuits in transient ESD events.
Degree: PhD, Electrical & Computer Engineering, 2015, University of Illinois – Urbana-Champaign
URL: http://hdl.handle.net/2142/87964
► This thesis presents a methodology to model and simulate transient electrostatic discharge (ESD) responses of integrated circuits (IC). To obtain valid simulation results, the IC…
(more)
▼ This thesis presents a methodology to model and simulate transient
electrostatic discharge (ESD) responses of integrated circuits (IC). To obtain valid simulation results, the IC component must be represented by a circuit netlist composed of device models that are valid under the ESD conditions. Models of the nonlinear devices that make up the ESD protection network of the IC must have transient I-V responses calibrated against measurements that emulate ESD events. Interconnects, power distribution networks, and the silicon substrate on the chip die as well as on the IC package must be faithfully constructed to emulate the fact that ESD current flows in a distributed manner across the entire IC component. The resultant equivalent circuit model therefore contains a huge number of nodes and devices, and the simulation runtime may be prohibitively long. Techniques must be devised to make the numerical simulation process more efficient without sacrifice of accuracy. These techniques include reasonable abstraction of the distributed full-component circuit netlist, dynamic piecewise-linear device models, and customized efficient transient circuit simulator. With the simulation streamlining techniques set up properly, comprehensive and predictive transient ESD simulation can be carried out efficiently to investigate the weakest link in the target IC, and the design can be fine-tuned to achieve optimal performance in both functionality and ESD reliability.
Advisors/Committee Members: Rosenbaum, Elyse (advisor), Rosenbaum, Elyse (Committee Chair), Chen, Deming (committee member), Schutt-Ainé, José E. (committee member), Wong, Martin D.F. (committee member).
Subjects/Keywords: Electrostatic Discharge (ESD); Circuit Simulation; Compact Modeling; Full-component Model; Piecewise-linear Behavior Model; ESD metal–oxide–semiconductor field-effect transistor (MOSFET); ESD Diode; Numerical Circuit Analysis; Simulator
…108
6.5.3 Speed-up from PWL-TR Modeling… …130
viii
Chapter 1. Introduction
Electrostatic discharge (ESD) is defined as a… …touches a grounded surface, or
an electrostatic field induces a voltage across a dielectric… …Motivation for Modeling and Simulation of ESD Events
A CAD tool can be employed in the development… …8].
1.3 Challenges in Modeling and Simulation of IC Devices
1.3.1 Modeling and…
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APA ·
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MLA ·
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CSE |
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to Zotero / EndNote / Reference
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APA (6th Edition):
Meng, K. (2015). Modeling and simulation of full-component integrated circuits in transient ESD events. (Doctoral Dissertation). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/87964
Chicago Manual of Style (16th Edition):
Meng, Kuo-Hsuan. “Modeling and simulation of full-component integrated circuits in transient ESD events.” 2015. Doctoral Dissertation, University of Illinois – Urbana-Champaign. Accessed March 07, 2021.
http://hdl.handle.net/2142/87964.
MLA Handbook (7th Edition):
Meng, Kuo-Hsuan. “Modeling and simulation of full-component integrated circuits in transient ESD events.” 2015. Web. 07 Mar 2021.
Vancouver:
Meng K. Modeling and simulation of full-component integrated circuits in transient ESD events. [Internet] [Doctoral dissertation]. University of Illinois – Urbana-Champaign; 2015. [cited 2021 Mar 07].
Available from: http://hdl.handle.net/2142/87964.
Council of Science Editors:
Meng K. Modeling and simulation of full-component integrated circuits in transient ESD events. [Doctoral Dissertation]. University of Illinois – Urbana-Champaign; 2015. Available from: http://hdl.handle.net/2142/87964
17.
Guo, Qiongyu.
POSS-Based Biodegradable Polymers for Stent Applications:
Electroprocessing, Characterization and Controlled Drug
Release.
Degree: PhD, Macromolecular Science and Engineering, 2010, Case Western Reserve University School of Graduate Studies
URL: http://rave.ohiolink.edu/etdc/view?acc_num=case1259706279
► Polyhedral oligosilsesquioxane (POSS)-based biodegradable polymers were investigated as stent coating for drug delivery from drug-eluting stents and as polymeric scaffold for fully bioabsorbable stents.…
(more)
▼ Polyhedral oligosilsesquioxane (POSS)-based
biodegradable polymers were investigated as stent coating for drug
delivery from drug-eluting stents and as polymeric scaffold for
fully bioabsorbable stents. A highly efficient and precise
electrospraying technique, one of the
electrostatic processing
techniques, was developed for the stent coating application. The
roughness of stent coatings produced was varied conveniently by the
electrospraying technique utilizing different electrospraying mode
or Coulombic fission, and was further modified using
post-treatments of pure solvent electrospraying or vapor welding.
Abluminal stent coatings were achieved utilizing the targeting
nature of the charged electrospraying droplets to avoid luminal
coating on stents by applying nonconductive materials temporarily
contacting the inner surface of the
stents. Long-standing questions of paclitaxel
(PTx)-polymer blend miscibility and interactions were studied for
particular polymer blends using characterization methods. It was
found that paclitaxel is amorphous in all proportions in the blends
of paclitaxel with POSS-based thermoplastic polyurethanes (POSS
TPUs), and serves as an antiplasticizer by increasing the blend Tg
gradually from the polymer Tg up to the substantially higher Tg of
amorphous paclitaxel. The polyethylene glycol (PEG) segment
incorporated in POSS TPUs exhibited specific hydrogen-bonding
interactions with the paclitaxel and promoted the miscibility in
the blends. Highly adjustable release of
paclitaxel was achieved from both thermoplastic stent coatings
utilizing P(DLLA-co-CL)-based POSS TPUs, and thermoset stent
coatings employing PLGA-POSS end-linked thiol-ene network. Using a
newly-developed drug release approximation model describing the
entire drug release profile, paclitaxel release mechanisms from
these biodegradable stent coatings were interpreted quantitatively,
including the effects of polymer glass transition temperature,
polymer initial molecular weight, degradation, coating swelling,
POSS content, drug concentration, and coating thickness.
Fully bioabsorbable shape-memory stents were
fabricated using four cost-effective methods, including dipping
coating method, fiber tube fabrication using electrospinning
technique, which is another
electrostatic processing method, mesh
tube welding, and stent writing extrusion. The stent mechanical
testing methods to characterize the radial stiffness and collapse
pressure of stents were also improved using dynamic mechanical
analysis (DMA) combined with a newly-designed stent compression
holder.
Advisors/Committee Members: Mather, Patrick T. (Advisor).
Subjects/Keywords: Biomedical Research; Polymers; POSS; biodegradable polymer; drug delivery; drug-eluting stents; polymeric stent; drug release modeling; paclitaxel; electrostatic processing; electrospraying; electrospinning; coating roughness; miscibility; specific interactions; shape memory
Record Details
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Record Details
Similar Records
Cite
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Guo, Q. (2010). POSS-Based Biodegradable Polymers for Stent Applications:
Electroprocessing, Characterization and Controlled Drug
Release. (Doctoral Dissertation). Case Western Reserve University School of Graduate Studies. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=case1259706279
Chicago Manual of Style (16th Edition):
Guo, Qiongyu. “POSS-Based Biodegradable Polymers for Stent Applications:
Electroprocessing, Characterization and Controlled Drug
Release.” 2010. Doctoral Dissertation, Case Western Reserve University School of Graduate Studies. Accessed March 07, 2021.
http://rave.ohiolink.edu/etdc/view?acc_num=case1259706279.
MLA Handbook (7th Edition):
Guo, Qiongyu. “POSS-Based Biodegradable Polymers for Stent Applications:
Electroprocessing, Characterization and Controlled Drug
Release.” 2010. Web. 07 Mar 2021.
Vancouver:
Guo Q. POSS-Based Biodegradable Polymers for Stent Applications:
Electroprocessing, Characterization and Controlled Drug
Release. [Internet] [Doctoral dissertation]. Case Western Reserve University School of Graduate Studies; 2010. [cited 2021 Mar 07].
Available from: http://rave.ohiolink.edu/etdc/view?acc_num=case1259706279.
Council of Science Editors:
Guo Q. POSS-Based Biodegradable Polymers for Stent Applications:
Electroprocessing, Characterization and Controlled Drug
Release. [Doctoral Dissertation]. Case Western Reserve University School of Graduate Studies; 2010. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=case1259706279
. 
Open Access Theses and Dissertations
