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Nonlinear Control Synthesis For Facilitation Of Human-Robot Interaction, Zhangchi Ding
Nonlinear Control Synthesis For Facilitation Of Human-Robot Interaction, Zhangchi Ding
Electronic Theses and Dissertations
Human-robot interaction is an area of interest that is becoming increasingly important in robotics research. Nonlinear control design techniques allow researchers to guarantee stability, performance, as well as safety, especially in cases involving physical human-robot interaction (PHRI). In this dissertation, we will propose two different nonlinear controllers and detail the design of an assistive robotic system to facilitate human-robot interaction. In Chapter 2, to facilitate physical human-robot interaction, the problem of making a safe compliant contact between a human and an assistive robot is considered. Users with disabilities have a need to utilize their assistive robots for physical interaction during …
Design, Synthesis And Characterization Of Biomimetic, Bioinspired And Bio-Related Functional Polymers For Atmospheric Water Recovery, Abdullah Alqassar
Design, Synthesis And Characterization Of Biomimetic, Bioinspired And Bio-Related Functional Polymers For Atmospheric Water Recovery, Abdullah Alqassar
Electronic Theses and Dissertations
Atmospheric water recovery in changing environments has received wide attention in environmental science and engineering communities due to rapid population growth and frequent droughts. This study is focused on the design, synthesis, and characterization of biomimetic, bioinspired, and bio-related functional polymers (b3p) to help resolve the water supply issue especially in arid or semi-arid regions. It is aimed to develop unique synthetic methods to access well-defined polymers with the aid of nanomaterials and metal to produce next generation polymer materials for better atmospheric water recovery. The design of such new b3p is bioinspired by some skin materials of biological species …
Chemical Vapor Deposition Growth Of Large Area 2d Mos2 Layers: Layer Orientation Control, Heterostructure Integration, And Applications For Stretchable Sensors., Md. Ashraful Islam
Chemical Vapor Deposition Growth Of Large Area 2d Mos2 Layers: Layer Orientation Control, Heterostructure Integration, And Applications For Stretchable Sensors., Md. Ashraful Islam
Electronic Theses and Dissertations
Two-dimensional (2D)-layered MoS2 layers have exhibited a broad set of unusual and superior material properties unattainable in any traditional bulk materials, drawing significant research interests nowadays. For instance, they present excellent semiconducting properties accompanying high carrier mobility and large current ON/OFF ratio as well as extensive in-plane strain limit and thickness, projecting high suitably for emerging flexible and stretchable electronics. Such properties and applications strongly depend on the physical orientation and chemical composition of constituent 2D layers. 2D MoS2 layers chemically grown in two distinct orientations, e.g., horizontal alignment for electronics and optoelectronics, and vertical alignment for electrochemical and sensing …
Long-Term Carbon And Copper Impact On Nutrient Removal Via Green Sorption Media In Dynamic Linear Ditch Environments, Diana Ordonez
Long-Term Carbon And Copper Impact On Nutrient Removal Via Green Sorption Media In Dynamic Linear Ditch Environments, Diana Ordonez
Electronic Theses and Dissertations
Nutrient-laden stormwater runoff causes environmental and ecological impacts on receiving water bodies. Biosorption Activated Media (BAM) composed of the sand, tire crumb, and clay have been implemented in stormwater best management practices due to its ability to efficiently remove nutrients from stormwater runoff, such as in roadside linear ditches, via unique chemophysical and microbiological processes. In this study, a set of fixed-bed columns were set up to simulate some external forces in roadside linear ditches and examine how these external forces affect the performance of BAM. In our experiment, scenario 1 simulates the impact that animals such as tortoises, moles …
Design And Structural Analysis Of Morphing Wings, Nicholas Fernandez
Design And Structural Analysis Of Morphing Wings, Nicholas Fernandez
Electronic Theses and Dissertations
Many natural flyers and marine swimmers can morph their wings during a number of unsteady maneuverings. With such wing morphing they are able to control the unsteady aerodynamic forces. A number of man-made flyers, such as unmanned aerial vehicles and micro air vehicles, fly in comparable Reynolds number range, but they are yet to acquire similar morphing capabilities as natural flyers or swimmers. Moreover, the knowledge of fluid structural interaction (FSI) of such morphing wings is not well developed. Hence there is a need to investigate the FSI of morphing wings. In this thesis, a morphing wing was designed and …
Multiphase Flow Modeling Of Molten Metal Atomization At High Gas Pressure, Kalpana Hanthanan Arachchilage
Multiphase Flow Modeling Of Molten Metal Atomization At High Gas Pressure, Kalpana Hanthanan Arachchilage
Electronic Theses and Dissertations
The high-pressure gas atomization is well known as one of the best powder manufacturing processes due to its controllability over powder size distribution. However, with the continuous improvement of new alloys, optimizing the operating parameters to maximize the yield is costly and time-consuming. Therefore, it is essential to understand the high-pressure gas atomization process and the effects of different operational parameters on the powder size distribution. Two-phase numerical simulations are performed to capture the interfacial dynamic during the atomization process and to obtain the effects of gas pressure, melt flow rate, and thermophysical properties of atomizing gas and the molten …
Computational Fluid Dynamics Investigation Of A Novel Hybrid Comprehensive Stage Ii Operation For Single Ventricle Palliation, Marwan Hameed
Computational Fluid Dynamics Investigation Of A Novel Hybrid Comprehensive Stage Ii Operation For Single Ventricle Palliation, Marwan Hameed
Electronic Theses and Dissertations
Hypoplastic left heart syndrome (HLHS) is a type of heart defect where the left ventricle is underdeveloped or not developed, resulting in only a single functioning right ventricle. Approximately 7.5% of patients with congenital heart disease are born with a single ventricle (SV) which is accompanied by a spectrum of other malformations such as atrophied ascending aorta, atrial septal defects, and ventricular septal defects (VSD). The existing three-hybrid staged surgical approach serving as a palliative treatment for this anomaly entails multiple complications and achieves a survival rate of only 50%. To reduce the trauma associated with the second stage of …
Probing The Influence Of Cx43 And Glucose On Endothelial Biomechanics, Md Mydul Islam
Probing The Influence Of Cx43 And Glucose On Endothelial Biomechanics, Md Mydul Islam
Electronic Theses and Dissertations
Endothelial cells (ECs) form the innermost layer of all vasculature and constantly receive both biochemical and biomechanical signals, yielding a plethora of biomechanical responses. In response to various biochemical or biomechanical cues, ECs have been documented to generate biomechanical responses such as tractions and intercellular stresses between the cell and substrate and between adjacent cells in a confluent monolayer, respectively. Thus far, the ability of endothelial tight junctions and adherens junctions to transmit intercellular stresses has been actively investigated, but the role of gap junctions is currently unknown. In addition, there is no report of the independent influence of hyperglycemia …
Fabrication Of Polyelectrolyte Nanoparticles Through Hydrophobic Interaction, Ruginn Porce Catarata
Fabrication Of Polyelectrolyte Nanoparticles Through Hydrophobic Interaction, Ruginn Porce Catarata
Electronic Theses and Dissertations
Anticancer drugs like gemcitabine (GEM) are used to treat cancers such as, pancreatic ductal adenocarcinoma (PDAC). However, the use of free gemcitabine yields challenges including cytotoxicity to healthy cells and poor circulation time. By encapsulating GEM in nanoparticles these challenges can be overcome. In this study poly(acrylic acid) (PAA)-GEM nanoparticles are fabricated by coupling GEM onto PAA. The particle formation is driven by the hydrophobic interaction of GEM, which collects in the core of the nanoparticle, forming a PAA shell. The nanoparticles were optimized by studying the PAA/GEM ratio and pH during fabrication. Characteristics of the nanoparticles including size, morphology …
Novel Solid State Lasers Based On Volume Bragg Gratings, Evan Hale
Novel Solid State Lasers Based On Volume Bragg Gratings, Evan Hale
Electronic Theses and Dissertations
Since their invention in 1960, lasers have revolutionized modern technology, and tremendous amounts of innovation and development has gone into advancing their properties and efficiencies. This dissertation reports on further innovations by presenting novel solid state laser systems based on the volume Bragg gratings (VBGs) and the newly developed holographic phase mask (HPMs) for brightness enhancement, dual wavelength operation, and mode conversion. First, a new optical element was created by pairing the HPM with two surface gratings creating an achromatic holographic phase mask. This new optical device successfully performed transverse mode conversion of multiple narrow line laser sources operating from …
Partnering With Paraprofessionals: Expanding Preschool Children's Responses Through Dialogic Reading, Juliana Hirn
Partnering With Paraprofessionals: Expanding Preschool Children's Responses Through Dialogic Reading, Juliana Hirn
Electronic Theses and Dissertations
Shared interactive reading is an evidence-based practice where professionals can collaborate to promote literacy and language skills in young children. Providing children with developmental disabilities (DD) the opportunity to gain language and preliteracy skills in early intervention is critical for their development as they are at a higher risk for falling behind in academics compared to their age-matched peers. This study evaluated the effectiveness of dialogic reading (DR) for children with DD. DR has been shown to be an effective strategy to teach typically developing preschool-aged children vocabulary, language, and literacy skills, however research in children with DD is limited. …
Numerical Simulation Of Non-Premixed And Premixed Axial Stage Combustor At High Pressure, Tyler Worbington
Numerical Simulation Of Non-Premixed And Premixed Axial Stage Combustor At High Pressure, Tyler Worbington
Electronic Theses and Dissertations
Axial-staged combustors represent an important concept that can be applied to reduce NOx emissions throughout a gas turbine engine. There are four main CFD models presented in this study that describe a highly turbulent jet-in-crossflow (JIC) simulation of partially premixed and non-premixed jets with a constant chamber pressure of 5 atm absolute. The equivalence ratio of the partially premixed jet was held constant at rich conditions with a �������� of 4 while the main stage varied from ��1 and ��2 of 0.575 and 0.73 with an average headend temperature of 1415K and 1545K, respectively. Chemistry was reduced by tabulation of …
Repro, But Make It Fashion: Discourses On Sex, Sexuality, And Reproduction In Teen Vogue Magazine, Estefany Londono
Repro, But Make It Fashion: Discourses On Sex, Sexuality, And Reproduction In Teen Vogue Magazine, Estefany Londono
Electronic Theses and Dissertations
There are many possible sources for youth to become educated about sexuality and reproduction, however the media are cited as particularly powerful and prominent sources of information (Jaworski, 2009). Particularly in an era in which abstinence-only messaging dominates sex education, media become a source to which young people turn and where they receive much of their sex-based messaging. Due to backlash over problematic content that perpetuates gender stereotypes and relays harmful messages about sex and sexuality, some magazines, including Teen Vogue, have attempted to shift towards more feminist-minded content (Keller, 2011, Milkie, 2002). This study is a qualitative critical feminist …
Variation In Prospecting Behavior And Drivers Of Post-Fire Habitat Preference Among Juvenile Florida Scrub-Jays, David Sherer
Variation In Prospecting Behavior And Drivers Of Post-Fire Habitat Preference Among Juvenile Florida Scrub-Jays, David Sherer
Electronic Theses and Dissertations
Florida Scrub-Jays (Aphelocoma coerulescens, FLSJ; federally Threatened) are cooperatively breeding birds endemic to Florida and dependent on fire-maintained xeric oak scrub. FLSJs are year-round residents, highly territorial, and rarely disperse far from their natal territory. Lifetime reproductive success is highest among individuals breeding in early-successional habitat, usually less than 9 to 10 years post-fire. However, because scrub burns infrequently such early-successional, high-quality habitat is extremely limited and competition for it as breeding space is likely intense. Because some birds live long enough to experience habitat succession, FLSJs also occupy later-successional overgrown scrub, even though both survival and fecundity decline. Although …
Reliability And Robustness Enhancement Of Cooperative Vehicular Systems: A Bayesian Machine Learning Perspective, Hossein Nourkhiz Mahjoub
Reliability And Robustness Enhancement Of Cooperative Vehicular Systems: A Bayesian Machine Learning Perspective, Hossein Nourkhiz Mahjoub
Electronic Theses and Dissertations
Autonomous vehicles are expected to greatly transform the transportation domain in the near future. Some even envision that the human drivers may be fully replaced by automated systems. It is plausible to assume that at least a significant part of the driving task will be done by automated systems in not a distant future. Although we are observing a rapid advance towards this goal, which gradually pushes the traditional human-based driving toward more advanced autonomy levels, the full autonomy concept still has a long way before being completely fulfilled and realized due to numerous technical and societal challenges. During this …
Context-Centric Affect Recognition From Paralinguistic Features Of Speech, Andreas Marpaung
Context-Centric Affect Recognition From Paralinguistic Features Of Speech, Andreas Marpaung
Electronic Theses and Dissertations
As the field of affect recognition has progressed, many researchers have shifted from having unimodal approaches to multimodal ones. In particular, the trends in paralinguistic speech affect recognition domain have been to integrate other modalities such as facial expression, body posture, gait, and linguistic speech. Our work focuses on integrating contextual knowledge into paralinguistic speech affect recognition. We hypothesize that a framework to recognize affect through paralinguistic features of speech can improve its performance by integrating relevant contextual knowledge. This dissertation describes our research to integrate contextual knowledge into the paralinguistic affect recognition process from acoustic features of speech. We …
Shock Tube Investigations Of Novel Combustion Environments Towards A Carbon-Neutral Future, Samuel Barak
Shock Tube Investigations Of Novel Combustion Environments Towards A Carbon-Neutral Future, Samuel Barak
Electronic Theses and Dissertations
Supercritical carbon dioxide (sCO2) cycles are being investigated for the future of power generation. These cycles will contribute to a carbon-neutral future to combat the effects of climate change. These direct-fired closed cycles will produce power without adding significant pollutants to the atmosphere. For these cycles to be efficient, they will need to operate at significantly higher pressures (e.g., 300 atm for Allam Cycle) than existing systems (typically less than 40 atm). There is limited knowledge on combustion at these pressures or at the high dilution of carbon dioxide. Nominal fuel choices for gas turbines include natural gas and syngas …
Cryogenic Performance Projections For Ultra-Small Oxide-Free Vertical-Cavity Surface-Emitting Lasers, Mina Bayat
Cryogenic Performance Projections For Ultra-Small Oxide-Free Vertical-Cavity Surface-Emitting Lasers, Mina Bayat
Electronic Theses and Dissertations
Small-sized vertical-cavity surface-emitting laser (VCSEL) may offer very low power consumption along with high reliability for cryogenic data transfer. Cryogenic data transfer has application in supercomputers and superconducting for efficient computing and also focal plane array cameras operating at 77 K, and at the lower temperature of 4 K for data extraction from superconducting circuits. A theoretical analysis is presented for 77 K and 4 K operation based on small cavity, oxide-free VCSEL sizes of 2 to 6 µm, that have been shown to operate efficiently at room temperature. Temperature dependent operation for optimally-designed VCSELs are studied by calculating the …
Supporting Learning In 3d Virtual Environments: The Impact Of Intergenerational Joint Media Engagement, Robert Michlowitz
Supporting Learning In 3d Virtual Environments: The Impact Of Intergenerational Joint Media Engagement, Robert Michlowitz
Electronic Theses and Dissertations
Studies have indicated that intergenerational relationships can assist children to learn more efficiently by providing support. As new forms of media have emerged and become pervasive in our society, it is important to understand how children use them to learn. Just as television coviewing has been observed by past researchers to aid youths to learn with parents and grandparents, three-dimensional virtual learning environments (VLE) are being investigated for their potential. This study seeks to examine the potential learning impact on children, ages 8 to 13, encountering a three-dimensional virtual learning environment with their grandparents. The primary research question this study …
Mapping Addiction: A Digital Psychogeographic Approach To America's Addiction Epidemic, Clayton Benjamin
Mapping Addiction: A Digital Psychogeographic Approach To America's Addiction Epidemic, Clayton Benjamin
Electronic Theses and Dissertations
Focusing on policy consultation, my dissertation consults on the current US addiction epidemic and aims to answer, "What is our disposition to addiction?" Borrowing and clarifying Ulmer's MEmorial method, as established in his text Electronic Monuments, the dissertation combines the ancient Greek practice of theoria, Deleuzian theory, and psychogeographic counter-mapping methods to trace ways in which ideological apparatuses construct addiction. The aim of the dissertation is to reveal an abject value by constructing MEmorials which provide space for individuals to mourn loss and see their relation to that loss. Through mourning, individuals strengthen their ties to other community members and …
Design Of Unimorph Out-Of-Plane Piezoelectric Actuator, Kevin Chan
Design Of Unimorph Out-Of-Plane Piezoelectric Actuator, Kevin Chan
Electronic Theses and Dissertations
Electromechanical transduction is an important component of microelectromechanical systems (MEMS), a technology with wide-ranging applications, including mobile computing, sensors, energy harvesting, and displays. These disparate applications have varying performance requirements, but generally transduction efficiency, mechanical precision, response time, cost, compatibility with photolithography and other fabrication processes, and operability at micro-scale are all desired metrics for MEMS devices. Piezoelectric transduction provides substantial advantages, including precise displacements, quick response times, and high transduction efficiency. These strengths make piezoelectric transduction particularly well-suited for use in resonators, sensors, and energy harvesters. However, piezoelectric transduction also produces much smaller magnitudes of movements than other electromechanical …
On-Chip Esd Protection Design: Optimized Clamps, Linfeng He
On-Chip Esd Protection Design: Optimized Clamps, Linfeng He
Electronic Theses and Dissertations
The extensive use of Integrated Circuits (ICs) means complex working conditions for these tiny chips. To guarantee the ICs could work properly in various environments, some special protection strategies are required to improve the reliability of system. From all the possible reliability issues, the electrostatics discharge (ESD) might be the most common one. The peak current of electrostatics can be as high as tens of amperes and the peak voltage can be over thousand voltages. In contrast, the size of semiconductor device fabricated is continuing to scale down, making it even more vulnerable to high level overstress and current surge …
Disinfection By-Product Formation Potential Assessment For Central Florida Groundwater Supplies, Tulsi Shukla
Disinfection By-Product Formation Potential Assessment For Central Florida Groundwater Supplies, Tulsi Shukla
Electronic Theses and Dissertations
Disinfection of potable water supplies is a primary requirement of the United States' Environmental Protection Agency's (USEPA's) Safe Drinking Water Act. The use of chlorine as a disinfectant is widely accepted by water purveyors due to its effectiveness and low cost. However, chlorine reacts with natural organic matter present in water supplies to form suspected carcinogenic disinfection by-products (DBPs). In this work, the formation of the regulated chlorinated by-products total trihalomethanes (TTHMs) and haloacetic acids (HAA5) for eleven Central Florida wells has been investigated. Fluorescence, UV-254, dissolved organic carbon (DOC), specific UV absorbance (SUVA), chlorine decay, and TTHM and HAA5 …
Study Of Acceleration Sensitivity And Nonlinear Behavior In Silicon-Based Mems Resonators, Beheshteh Khazaeili Najafabadi
Study Of Acceleration Sensitivity And Nonlinear Behavior In Silicon-Based Mems Resonators, Beheshteh Khazaeili Najafabadi
Electronic Theses and Dissertations
The focus of this work is to study nonlinear behavior in silicon-based micro-resonators and more specifically develop models that could predict acceleration sensitivity and amplitude-frequency nonlinearity in such resonators. Acceleration sensitivity in silicon bulk-acoustic wave (BAW) oscillators is studied and a correlation between the resonator alignment to different crystalline planes of silicon and the observed acceleration sensitivity is established. It is shown both with experiment and the proposed finite element model, that the oscillator vibration sensitivity is significantly lower when the silicon-based lateral-extensional (LE) mode resonator is aligned to < 110 > orientation compared to when the same resonator is aligned to < 100 > . …
Artificial Magnetism And Topological Phenomena In Optics, Midya Parto
Artificial Magnetism And Topological Phenomena In Optics, Midya Parto
Electronic Theses and Dissertations
Recent years have witnessed intense research activities to effectively control the flow of photons using various classes of optical structures such as photonic crystals and metamaterials. In this regard, optics has benefited from concepts in condensed matter and solid-state physics, where similar problems concerning electronic wavefunctions arise. An important example of such correspondence is associated with the photon dynamics under the effect of an artificial magnetic field. This is especially important since photons, as neutral bosons, do not inherently interact with magnetic fields. One way to mitigate this issue is to exploit magneto-optical materials. However, as is well known, using …
High-Dynamic-Range Foveated Near-Eye Display System, Guanjun Tan
High-Dynamic-Range Foveated Near-Eye Display System, Guanjun Tan
Electronic Theses and Dissertations
Wearable near-eye display has found widespread applications in education, gaming, entertainment, engineering, military training, and healthcare, just to name a few. However, the visual experience provided by current near-eye displays still falls short to what we can perceive in the real world. Three major challenges remain to be overcome: 1) limited dynamic range in display brightness and contrast, 2) inadequate angular resolution, and 3) vergence-accommodation conflict (VAC) issue. This dissertation is devoted to addressing these three critical issues from both display panel development and optical system design viewpoints. A high-dynamic-range (HDR) display requires both high peak brightness and excellent dark …
You Can Sit With Us: An Investigation Of Organizational Rationale For Diversity And Inclusion Climate, Stephanie Leonard
You Can Sit With Us: An Investigation Of Organizational Rationale For Diversity And Inclusion Climate, Stephanie Leonard
Electronic Theses and Dissertations
Climate for inclusion has captured the attention of management scholars as well as practitioners due to the positive effects inclusive climates have on organizations. Prior research has shown that a strong climate for inclusion leads to desirable outcomes such as increased organizational commitment, job satisfaction, and creativity, as well as a decrease in intent to turnover (e.g., Acquavita et al., 2009; Groeneveld, 2011; Choi & Rainey, 2010; Pitts, 2009). However, the field is lacking understanding of the factors that impact inclusion climate (Guillaume et al., 2014). To answer this call for inclusion climate formation research, this dissertation considers the relationship …
Parameter Estimation Of Stochastic Models Against Probabilistic Temporal Logic Behavioral Specifications, Arfeen Khalid
Parameter Estimation Of Stochastic Models Against Probabilistic Temporal Logic Behavioral Specifications, Arfeen Khalid
Electronic Theses and Dissertations
The inherent behavioral variability exhibited by stochastic systems makes it a challenging task for human experts to manually analyze them. Computational modeling of such systems helps in investigating and predicting the behaviors of their underlying processes but at the same time introduces the presence of several unknown parameters. A key challenge faced in this scenario is to determine the values of these unknown parameters against known behavioral specifications. The solutions that have been presented so far estimate the parameters of a given model against a single specification whereas a correct model is expected to satisfy all the behavioral specifications when …
The Evaluation Of Classifier Performance On The Forensic Analysis Of Fire Debris And The Expansion Of The Substrate Database, Alyssa Allen
The Evaluation Of Classifier Performance On The Forensic Analysis Of Fire Debris And The Expansion Of The Substrate Database, Alyssa Allen
Electronic Theses and Dissertations
The current protocols in fire debris analysis rely on ignitable liquid pattern recognition and the identification of target compounds. These practices allow fire debris analysts to determine whether a sample contains or is absent of ignitable liquid residue and to classify that type of ignitable liquid based upon subjective thresholds. A statistical approach using computationally mixed datasets was devised in this research to generate an objective approach to the classification of fire debris samples and to determine error rates. Quadratic, linear, and partial least squares linear discriminant analysis (QDA, LDA, and PLS-DA) models were developed and evaluated to determine the …
Fundamental Characteristics Of Supercritical Co2 Combustion, Raghu Veera Manikantachari Kancherla
Fundamental Characteristics Of Supercritical Co2 Combustion, Raghu Veera Manikantachari Kancherla
Electronic Theses and Dissertations
The direct-fired supercritical CO2 (sCO2) cycle is conceptually superior to many of the trending energy production technologies due to their remarkably promising efficiency, environmental friendliness and cost. The accurate simulation of this combustion is very important because the operating conditions are very challenging to its experimentation. Hence, the current work focuses on identifying various thermal, transport, chemical kinetic models, investigating various fundamental characteristics and verifying the validity of important underlying modeling assumptions in focus to supercritical CO2 combustion. In the current work, various thermal and transport property models are identified based on accuracy, computational cost and ease of implementation for …