Matching Items (54)
Description
The Metal Semiconductor Field Effect Transistor (MESFET) has high potential to enter analog and RF applications due to their high breakdown voltage and switching frequency characteristics. These MESFET devices could allow for high voltage analog circuits to be integrated with low voltage digital circuits on a single chip in an extremely cost effective way. Higher integration leads to electronics with increased functionality and a smaller finished product. The MESFETs are designed in-house by the research group led by Dr. Trevor Thornton. The layouts are then sent to multi-project wafer (MPW) integrated circuit foundry companies, such as the Metal Oxide Semiconductor Implementation Service (MOSIS) to be fabricated. Once returned, the electrical characteristics of the devices are measured. The MESFET has been implemented in various applications by the research group, including the low dropout linear regulator (LDO) and RF power amplifier. An advantage of the MESFET is that it can function in extreme environments such as space, allowing for complex electrical systems to continue functioning properly where traditional transistors would fail.
ContributorsKam, Jason (Author) / Thornton, Trevor (Thesis director) / Goryll, Michael (Committee member) / Barrett, The Honors College (Contributor) / Electrical Engineering Program (Contributor)
Created2015-05
Description
MESFETs are used in high frequency applications and are typically made from GaAs. Dr. Trevor Thornton designed a silicon-on-insulator MESFET \u2014 a cheaper alternative with competitive capabilities. This paper concerns the characterization and modeling of this device to exhibit its marketability as a CMOS integrated transistor. Overviews of the MESFET's history and DLTS (deep level transient spectroscopy) are offered.
ContributorsTerrell, Catherine Elaine (Author) / Thornton, Trevor (Thesis director) / Young, Alexander (Committee member) / Barrett, The Honors College (Contributor) / Electrical Engineering Program (Contributor)
Created2014-05
Description
Computer Science and Dance are choice driven disciplines. The output of their processes are compositions of experience. Dancers are not computers and computers are not people but there are comparable traces of humanity in the way each interpret and interact with their respective inputs, outputs, and environments. These overlaps are perhaps not obvious, but in an increasingly specialized world it is important to discuss them. Dynamic Programming and improvisational movement exist within exclusive corners of their respective fields and are characterized by their inherent adaption to change. Inspired by the work of Ivar Hagendoorn, John Cage and other interdisciplinary artists, complexMovement is motivated by the need to create space for intersections between these two powerful groups and find overlaps in the questions they ask to achieve their goals. Dance and Computer Science are just one example of hidden partnerships between their respective fields. Their respective sides allow for ample side by side comparisons but for the purpose of this work, we will focus upon two smaller sectors of their studies: improvisational movement and the design of Dynamic Programming algorithms.
ContributorsOhlsen, Lai Yi Ni (Author) / Britt, Melissa (Thesis director) / Crissman, Angel (Committee member) / Standley, Eileen (Committee member) / Computer Science and Engineering Program (Contributor) / School of Art (Contributor) / Barrett, The Honors College (Contributor)
Created2016-05
Description
The topic of my creative project centers on the question of "How can the audience's choices influence dancers' improvisation?" This dance work seeks to redefine the relationship between audience and performers through integration of audience, technology, and movement in real-time. This topic was derived from the fields of Computer Science and Dance. To answer my main question, I need to explore how I can interconnect the theory of Computer Science/fundamentals of a web application and the elements of dance improvisation. This topic interests me because it focuses on combining two studies that do not seem related. However, I find that when I am coding a web application, I can insert blocks of code. This relates to dance improvisation where I have a movement vocabulary, and I can insert different moves based on the context. The idea of gathering data from an audience in real time also interests me. I find that data is most useful when a story can be deduced from that data. To figure out how I can use dance to create and tell a story about the data that is collected, I find that to be intriguing as well. The main goals of my Creative Project are to learn the skills needed to develop a web application using the knowledge and theory that I am acquiring through Computer Science as well as learning about the skills needed to produce a performance piece. My object for the overall project is to create an audience-interactive experience that presents choices for dancers and creates a connection between two completely different studies: Computer Science and Dance. My project will consist of having the audience enter their answers to preset questions via an online voting application. The stage background screen will be utilized to show the question results in percentages in the form of a chart. The dancers will then serve as a live interpretation of these results. This Creative Project will serve as a gateway between the work that has been cultivated in my studies and the real world. The methods involve exploring movement qualities in improvisation, communicating with my cast about what worked best for the transitions between each section of the piece, and testing for the web applications. I learned the importance of having structure within improvisational movement for the purpose of choreography. The significance of structure is that it provides direction, clarity, and a sense of unification for the dancers. I also learned the basics of the programming language, Python, in order to develop the two real-time web applications. The significance of learning Python is that I will be able to add this to my skillset of programming languages as well as build upon my knowledge of Computer Science and develop more real-world applications in the future.
ContributorsNgai, Courtney Taylor (Author) / Britt, Melissa (Thesis director) / Standley, Eileen (Committee member) / Computer Science and Engineering Program (Contributor) / School of Film, Dance and Theatre (Contributor) / Barrett, The Honors College (Contributor)
Created2018-05
Description
Engineered nanoporous substrates made using materials such as silicon nitride or silica have been demonstrated to work as particle counters or as hosts for nano-lipid bilayer membrane formation. These mechanically fabricated porous structures have thicknesses of several hundred nanometers up to several micrometers to ensure mechanical stability of the membrane. However, it is desirable to have a three-dimensional structure to ensure increased mechanical stability. In this study, circular silica shells used from Coscinodiscus wailesii, a species of diatoms (unicellular marine algae) were immobilized on a silicon chip with a micrometer-sized aperture using a UV curable polyurethane adhesive. The current conducted by a single nanopore of 40 nm diameter and 50 nm length, during the translocation of a 27 nm polystyrene sphere was simulated using COMSOL multiphysics and tested experimentally. The current conducted by a single 40 nm diameter nanopore of the diatom shell during the translocation of a 27 nm polystyrene sphere was simulated using COMSOL Multiphysics (28.36 pA) and was compared to the experimental measurement (28.69 pA) and Coulter Counting theory (29.95 pA).In addition, a mobility of 1.11 x 10-8 m2s-1V-1 for the 27 nm polystyrene spheres was used to convert the simulated current from spatial dependence to time dependence.
To achieve a sensing diameter of 1-2 nanometers, the diatom shells were used as substrates to perform ion-channel reconstitution experiments. The immobilized diatom shell was functionalized using silane chemistry and lipid bilayer membranes were formed. Functionalization of the diatom shell surface improves bilayer formation probability from 1 out of 10 to 10 out of 10 as monitored by impedance spectroscopy. Self-insertion of outer membrane protein OmpF of E.Coli into the lipid membranes could be confirmed using single channel recordings, indicating that nano-BLMs had formed which allow for fully functional porin activity. The results indicate that biogenic silica nanoporous substrates can be simulated using a simplified two dimensional geometry to predict the current when a nanoparticle translocates through a single aperture. With their tiered three-dimensional structure, diatom shells can be used in to form nano-lipid bilayer membranes and can be used in ion-channel reconstitution experiments similar to synthetic nanoporous membranes.
To achieve a sensing diameter of 1-2 nanometers, the diatom shells were used as substrates to perform ion-channel reconstitution experiments. The immobilized diatom shell was functionalized using silane chemistry and lipid bilayer membranes were formed. Functionalization of the diatom shell surface improves bilayer formation probability from 1 out of 10 to 10 out of 10 as monitored by impedance spectroscopy. Self-insertion of outer membrane protein OmpF of E.Coli into the lipid membranes could be confirmed using single channel recordings, indicating that nano-BLMs had formed which allow for fully functional porin activity. The results indicate that biogenic silica nanoporous substrates can be simulated using a simplified two dimensional geometry to predict the current when a nanoparticle translocates through a single aperture. With their tiered three-dimensional structure, diatom shells can be used in to form nano-lipid bilayer membranes and can be used in ion-channel reconstitution experiments similar to synthetic nanoporous membranes.
ContributorsRamakrishnan, Shankar (Author) / Goryll, Michael (Thesis advisor) / Blain Christen, Jennifer (Committee member) / Dey, Sandwip (Committee member) / Thornton, Trevor (Committee member) / Arizona State University (Publisher)
Created2015
Description
In this work, the insight provided by our sophisticated Full Band Monte Carlo simulator is used to analyze the behavior of state-of-art devices like GaN High Electron Mobility Transistors and Hot Electron Transistors. Chapter 1 is dedicated to the description of the simulation tool used to obtain the results shown in this work. Moreover, a separate section is dedicated the set up of a procedure to validate to the tunneling algorithm recently implemented in the simulator. Chapter 2 introduces High Electron Mobility Transistors (HEMTs), state-of-art devices characterized by highly non linear transport phenomena that require the use of advanced simulation methods. The techniques for device modeling are described applied to a recent GaN-HEMT, and they are validated with experimental measurements. The main techniques characterization techniques are also described, including the original contribution provided by this work. Chapter 3 focuses on a popular technique to enhance HEMTs performance: the down-scaling of the device dimensions. In particular, this chapter is dedicated to lateral scaling and the calculation of a limiting cutoff frequency for a device of vanishing length. Finally, Chapter 4 and Chapter 5 describe the modeling of Hot Electron Transistors (HETs). The simulation approach is validated by matching the current characteristics with the experimental one before variations of the layouts are proposed to increase the current gain to values suitable for amplification. The frequency response of these layouts is calculated, and modeled by a small signal circuit. For this purpose, a method to directly calculate the capacitance is developed which provides a graphical picture of the capacitative phenomena that limit the frequency response in devices. In Chapter 5 the properties of the hot electrons are investigated for different injection energies, which are obtained by changing the layout of the emitter barrier. Moreover, the large signal characterization of the HET is shown for different layouts, where the collector barrier was scaled.
ContributorsSoligo, Riccardo (Author) / Saraniti, Marco (Thesis advisor) / Goodnick, Stephen M (Committee member) / Chowdhury, Srabanti (Committee member) / Thornton, Trevor (Committee member) / Arizona State University (Publisher)
Created2016
Description
This project explores the cultivation of artistic methodologies centered in embodied movement practices. I worked in collaboration with dancers to inform the development of a movement vocabulary that is authentic to the individual as well as to the content of the work. Through the interplay between movement and subconscious response to elements such as writing, imagery, and physical environments I created authentic kinesthetic experiences for both dancer and audience. I submerged dancers into a constructed environment by creating authentic mental and physical experiences that supported the development of embodied movement. This was the impetus to develop the evening length work, Flesh Narratives, which consisted of five vignettes, each containing its own distinctive creative process driven by the content of each section. This project was presented January 29- 31, 2016 in the Fine Arts Center room 122, an informal theatre space, that supplemented an immersive experience in an intimate environment for forty viewers. This project explored themes of transformation including cycles, concepts of life, death and reincarnation, and enlightenment. Through the art of storytelling, the crafting of embodied movers, and the theory of Hauntology, the viewer was taken on a journey of struggle, loss, and rebirth.
ContributorsGerena, Jenny (Author) / Standley, Eileen (Thesis advisor) / Rosenkrans, Angela (Committee member) / Britt, Melissa (Committee member) / Arizona State University (Publisher)
Created2016
Description
This document analyzes the use of the Principles of Design within the applied project It’s My Party, a multimedia dance theatre production, as a means to address and overcome the stigmatization of the Human Immunodeficiency Virus (HIV). Through the orchestration of dance, music, props, acting, video, and spoken word, this interdisciplinary work investigates how these production elements synthesize into a transformative theatrical experience for audiences. Outlined in this document is the eight month design process. The process included concept design, assessing, processing, customizing the message, script development, rehearsals, and video production, and concluded with an evening length production. Analyzed through the structural narrative of The Hero’s Journey, this autobiographic work details the author’s HIV-positive (HIV+) coming out story from a restorative narrative perspective. By addressing the subject of HIV from a contemporary point-of-view, this project strives to reencode the troubling associations affiliated with HIV with an empowered and hopeful understanding.
ContributorsAlvarez, Ricardo (Author) / Schupp, Karen (Thesis advisor) / Magenta, Muriel (Committee member) / Rajko, Jessica (Committee member) / Standley, Eileen (Committee member) / Arizona State University (Publisher)
Created2016
Description
ABSTRACT
Connection, isolation, and female empowerment are not often explored nor analyzed together, yet often coexist harmoniously. Through processes of improvisation and dance making informed by feminist perspectives, the research investigated the intersections of empowerment, voice, knowledge construction and embodiment. It focused on women's ways of understanding their embodiment, the relationship between choice-making and meaning-making, processes of reflecting upon lived experiences, and exploring how experiences are expressed through the body and body attitudes. The research study explored and analyzed not only my own meaning making about connection, isolation, and female empowerment, but also the perspectives of fourteen young women between the ages of seventeen and twenty-three. Using the themes of connection, isolation, and female empowerment as fuel for creative expression and movement development, my dancers and I collaborated on making an evening length work that reflected our findings based on connection, isolation, and female empowerment and as well as embodied values.
Connection, isolation, and female empowerment are not often explored nor analyzed together, yet often coexist harmoniously. Through processes of improvisation and dance making informed by feminist perspectives, the research investigated the intersections of empowerment, voice, knowledge construction and embodiment. It focused on women's ways of understanding their embodiment, the relationship between choice-making and meaning-making, processes of reflecting upon lived experiences, and exploring how experiences are expressed through the body and body attitudes. The research study explored and analyzed not only my own meaning making about connection, isolation, and female empowerment, but also the perspectives of fourteen young women between the ages of seventeen and twenty-three. Using the themes of connection, isolation, and female empowerment as fuel for creative expression and movement development, my dancers and I collaborated on making an evening length work that reflected our findings based on connection, isolation, and female empowerment and as well as embodied values.
ContributorsGallagher, Grace (Author) / Dyer, Becky (Thesis advisor) / Standley, Eileen (Committee member) / Rajko, Jessica (Committee member) / Arizona State University (Publisher)
Created2016
Description
The Programmable Metallization Cell (PMC) is a novel solid-state resistive switching technology. It has a simple metal-insulator-metal “MIM” structure with one metal being electrochemically active (Cu) and the other one being inert (Pt or W), an insulating film (silica) acts as solid electrolyte for ion transport is sandwiched between these two electrodes. PMC’s resistance can be altered by an external electrical stimulus. The change of resistance is attributed to the formation or dissolution of Cu metal filament(s) within the silica layer which is associated with electrochemical redox reactions and ion transportation. In this dissertation, a comprehensive study of microfabrication method and its impacts on performance of PMC device is demonstrated, gamma-ray total ionizing dose (TID) impacts on device reliability is investigated, and the materials properties of doped/undoped silica switching layers are illuminated by impedance spectroscopy (IS). Due to the inherent CMOS compatibility, Cu-silica PMCs have great potential to be adopted in many emerging technologies, such as non-volatile storage cells and selector cells in ultra-dense 3D crosspoint memories, as well as electronic synapses in brain-inspired neuromorphic computing. Cu-silica PMC device performance for these applications is also assessed in this dissertation.
ContributorsChen, Wenhao (Author) / Kozicki, Michael N (Thesis advisor) / Barnaby, Hugh J (Thesis advisor) / Yu, Shimeng (Committee member) / Thornton, Trevor (Committee member) / Arizona State University (Publisher)
Created2017