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Dissertations / Theses on the topic 'Electromagnetic devices Design and construction'

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Published: 4 June 2021
Last updated: 29 January 2023

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1

Sutanto, Bintoro Jemmy. "An Electromagnetic Actuated Microvalve Fabricated on a Single Wafer." Diss., Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/4891.

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Microvalves are essential components of the miniaturization of the fluidic systems to control of fluid flow in a variety of applications as diverse as chemical analysis systems, micro-fuel cells, and integrated fluidic channel arrangements for electronic cooling. Using microvalves, these systems offer important advantages: they can operate using small sample volumes and provide rapid response time. This PhD dissertation presents the world first electromagnetically actuated microvalve fabricated on a single wafer with CMOS compatibility. In this dissertation, the design, fabrication, and testing results of two different types of electromagnetic microvalves are presented: the on/off microvalve and the bistable microvalve with latching mechanism. The microvalves operate with power consumption of less than 1.5 W and can control the volume flow rate of DI water, or a 50% diluted methanol solution in the range 1 - 50 µL in. The leaking rate of the on/off microvalve is the order of 30 nL/min. The microvalve demonstrated a response time for latching of 10 ms in water and 0.2 ms in air. This work has resulted in a US patent, application no. 10/699,210.Other inventions that have been developed as a result of this research are bidirectional, and bistable-bidirectional microactuators with latching mechanism, that can be utilized for optical switch, RF relay, micro mirror, nano indenter, or nano printings.
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2

Hammoud, Samer. "A methodology for developing optimized electromagnetic devices to populate a case-based reasoning system /." Thesis, McGill University, 2006. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=99766.

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When faced with a new design problem, Engineers most often tend to rely on their accumulated knowledge of science, mathematics, and appropriate experience to reach suitable solutions. Case-Based Reasoning is a new engineering paradigm that reflects this fact by suggesting solutions to novel problems based on the recall and reuse of specific experiences. Such a paradigm relies on previous successful design solutions that are stored in the form of separate cases in a database.
The aim of this thesis is to develop a process that will provide examples which can be used to set up a database of optimized designs for various electromagnetic devices such as loudspeakers and actuators. Each stored design will represent an optimum solution to a specific set of requirements for an electromagnetic device. These designs will eventually be used by a case-based reasoning system to reach a solution for possible requested future designs. The process will also involve developing a parameterization of a particular class of devices as well as testing optimization processes to be applied to the initial designs in order to ensure that the solutions stored in the case database represent effective and realistic devices which satisfy the requirements. This thesis also presents test results that illustrate how each optimized design conforms to certain requirements set as an input objective.
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3

Pinheiro, Helder Fleury 1967. "The application of Trefftz-FLAME to electromagnetic wave problems /." Thesis, McGill University, 2008. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=115703.

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Numerical analysis of the electromagnetic fields in large, complex structures is very challenging due to the high computational overhead. Recently, it has been shown that a new method called Trefftz-FLAME ( Flexible Local Approximation MEthod) is suitable for problems where there exist a large number of similar structures.
This thesis develops Trefftz-FLAME in two areas. First, a novel 2D Trefftz-FLAME method incorporates the modal analysis and port boundary condition that are essential to an accurate calculation of reflection and transmission coefficients for photonic crystal devices. The new technique outperforms existing methods in both accuracy and computational cost.
The second area pertains to the 3D, vector problem of electromagnetic wave scattering by aggregates of identical dielectric particles. A methodology for the development of local basis functions is introduced, applicable to particles of any shape and composition. Boundary conditions on the surface of the finite FLAME domain are described, capable of representing the incident wave and absorbing the outgoing radiation. A series of problems involving dielectric spheres is solved to validate the new method. Comparison with exact solutions is possible in some cases and shows that the method is able to produce accurate near-field results even when the computational grid spacing is equal to the radius of the spheres.
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4

Almaghrawi, Ahmed Almaamoun. "Collaborative design in electromagnetics." Thesis, McGill University, 2007. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=103363.

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We present a system architecture and a set of control techniques that allow heterogeneous software design tools to collaborate intelligently and automatically. One of their distinguishing features is the ability to perform concurrent processing. Systems based on this architecture are able to effectively solve large electromagnetic analysis problems, particularly those that involve loose coupling between several areas of physics. The architecture can accept any existing software analysis tool, without requiring any modification or customization of the tool. This characteristic is produced in part by our use of a neutral virtual representation for storing problem data, including geometry and material definitions. We construct a system based on this architecture, using several circuit and finite-element analysis tools, and use it to perform electromagnetic analyses of several different devices. Our results show that our architecture and techniques do allow practical problems to be solved effectively by heterogeneous tools.
On présente une architecture de système et un ensemble de techniquesde contrôle qui permettent aux logiciels d'analyse hétérogènes de collaborerde façon intelligente et automatique. Un de ses traits caractéristiques est sacapacité d'effectuer simultanément plusieurs traitements. Les systèmes baséssur cette architecture sont capables de résoudre de manière efficace des grandsproblèmes dans le domaine de l'analyse électromagnétique, particulièrementceux où existe un accouplement dégagé entre plusieurs domaines de physique.L'architecture peut accepter n'importe quel logiciel d'analyse existant; ellen'exige pas que les logiciels soyent modifiés ou fabriqués sur mesure. Cettecaractéristique est produite en partie par notre utilisation d'une représentationneutre virtuelle pour représenter les données du problème, y inclus sa géométrieet les proprietés de ses matériels. On construit un système basé sur cettearchitecture, comprenant plusieurs logiciels de simulation, et on l'emploie pourexécuter des analyses électromagnétiques de plusieurs appareils différents. Nosrésultats montrent que notre architecture et nos techniques permettent desproblèmes pratiques d'être résolus efficacement par les outils hétérogènes.
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5

Ray, Subhasis. "Multi-objective optimization of an interior permanent magnet motor." Thesis, McGill University, 2008. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=116021.

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In recent years, due to growing environmental awareness regarding global warming, green cars, such as hybrid electric vehicles, have gained a lot of importance. With the decreasing cost of rare earth magnets, brushless permanent magnet motors, such as the Interior Permanent Magnet Motor, have found usage as part of the traction drive system in these types of vehicles. As a design issue, building a motor with a performance curve that suits both city and highway driving has been treated in this thesis as a multi-objective problem; matching specific points of the torque-speed curve to the desired performance output. Conventionally, this has been treated as separate problems or as a combination of several individual problems, but doing so gives little information about the trade-offs involved. As a means of identifying the compromising solutions, we have developed a stochastic optimizer for tackling electromagnetic device optimization and have also demonstrated a new innovative way of studying how different design parameters affect performance.
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6

Li, Min. "Robust topological design of low frequency electromagnetic devices." Thesis, McGill University, 2014. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=121229.

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This thesis presents an automated topological design system for low frequency electromagnetic devices, e.g. an interior permanent magnet motor. The automated design is carried out through a topological shape optimization process: first, the system employs a topological sensitivity analysis to examine the design domain and to determine the optimal topology (distribution of source and materials); second, the system uses a shape optimizer to further improve the design; these two steps are performed alternately until the optimality condition is satisfied. The robustness of a topology with respect to small variations on its geometries is studied and a robustness measure is defined, originally in the thesis, as the worst case performance of an objective function for the topology and shape optimization. Therefore, the idea of robust design can be applied to the conceptual design (topological design) of electrical machines. Other than the application to motor design, the topology optimization algorithm developed in the thesis, was used originally in the non-destructive testing for quickly location and accurately shape reconstruction of cracks.
Cette thèse présente un système automatique de conception topologique pour les dispositifs électromagnétiques à basse fréquence, par exemple, un moteur à aimant permanent intérieur. La conception automatisée est effectuée par un processus d'optimisation topologique de la forme : d'abord, le système emploie une analyse de sensibilité topologique pour examiner le domaine de la conception et déterminer la topologie optimale (répartition des sources et des matériaux); Deuxièmement, le système utilise une optimisation de forme pour améliorer la conception, les deux étapes étant effectuées alternativement jusqu'à ce que la condition d'optimalité est satisfaite. La robustesse de la topologie par rapport à de petites variations est étudiée et une mesure de robustesse est défini, à l'origine dans cette thèse, comme la performance de la fonction objectif, dans le pire des cas, pour l'optimisation topologique de la forme. Le concept de conception robuste peut donc être appliquée à la conception (conception topologique) des machines électriques. Autre que l'application de la conception du moteur, l'algorithme d'optimisation topologique, développé dans la thèse, a été utilisé à l'origine dans le contrôle non destructif pour trouver rapidement les fissures et preciser la forme optimale.
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7

Fair, Ruben Jeevanasan. "Analysis and design of electromagnetic moving coil vibration generators." Thesis, Imperial College London, 1991. http://hdl.handle.net/10044/1/7830.

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8

Hendijanizadeh, M. "Design and optimisation of constrained electromagnetic energy harvesting devices." Thesis, University of Southampton, 2014. https://eprints.soton.ac.uk/364524/.

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This thesis investigates the design and optimisation of constrained electromagnetic energy harvesters. It provides optimal design guidelines for constrained electromagnetic energy harvesters under harmonic and random vibrations. To find the characteristics of the vibration source, for instance vertical motion of a boat, the spectrum of the excitation amplitude should be obtained. Two Kalman filter based methods are proposed to overcome the difficulties of calculating displacement from measured acceleration. Analytical models describing the dynamics of linear and rotational electromagnetic energy harvesters are developed. These models are used to formulate a set of design rules for constrained linear and rotational energy harvesters subjected to a given sinusoidal excitation. For the sake of comparison and based on the electromechanical coupling coefficient of the systems, the maximum output power and the corresponding efficiency of linear and rotational harvesters are derived in a unified form. It is shown that under certain condition, rotational systems have greater capabilities in transferring energy to the load resistance and hence obtaining higher efficiency than linear systems. Also, the performance of a designed rotational harvester in response to broadband and band-limited random vibrations is evaluated and an optimum design process is presented for maximizing the output power under these conditions. It is furthermore shown that the profile of the spectral density of the measured acceleration signal of a typical boat can be approximated by a Cauchy distribution which is used to calculate the extracted power extracted by the proposed energy harvester in real conditions. In order to increase the operational bandwidth of rotational energy harvesters, subjected to time-varying frequency vibrations, a variable moment of inertia mechanism is proposed to adaptively tune the resonance frequency of harvester to match the excitation frequency. Also, the effects of combining the variable moment of inertia mechanism and adjusting the load resistance to increase the operational bandwidth of the system for constrained and unconstrained applications are studied. Finally, a ball screw based prototype is manufactured and the experimental results of its testing are presented which confirm the validity of the design and the derived dynamic equations of the system.
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9

Ouyang, Jun. "Case-based reasoning for the creative design of electromagnetic devices." Thesis, McGill University, 2012. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=107659.

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Design is concerned with the question of how to construct an artifact or system to meet the desired specification and is normally categorized as either routine, non-routine or creative. Up until now, the study of knowledge-based design has concentrated on routine or non-routine design. In order to explore creativity in design, a new computational model based on the combination of case based reasoning (an approach to solving new problems based on the solutions of similar past problems) and soft computing techniques (such as machine learning, data mining and optimization), is proposed in this thesis. The new model is able to deal with the four challenging issues related to creativity: generation of a design prototype from incomplete requirements, judgment and improvement of system performance given a sparse initial case base library, extraction of pivotal features from a given feature space, adaptation of retrieved previous solutions to similar problems for deriving a new innovative solution to a given design task. The core principle underlying this model is that different knowledge from various level cases can be explicitly explored and integrated into a practical design process.In addition, in order to demonstrate the practical significance of our proposed computational model, a design system for electromagnetic devices which is capable of deriving a new design prototype from a real-world device case base with high dimensionality has been developed.
La conception en général s'intéresse à savoir comment construire un objet ou un système à partir d'une spécification et est normalement classée soit comme routine, non-routine ou créative. Jusqu'à présent, l'étude de la conception basée sur la connaissance est largement concentrée sur la conception routine et non routine. Afin d'explorer la classe créative de la conception, un nouveau modèle computationnel basé sur la combinaison de raisonnement par cas en fonction (une approche pour résoudre de nouveaux problèmes avec l'aide d'une base de solution à des problèmes similaires) et des techniques du «soft computing» (tels que l'apprentissage automatique, l'exploration de données et d'optimisation) est proposé dans cette thèse. Ce nouveau modèle est capable de traiter quatre difficultés associées à la conception créative: la génération d'un prototype à partir d'une spécification incomplète, le raisonnement et l'amélioration de la performance d'un système avec un manqué d'exemple dans la bibliothèque de base de cas, l'extraction de caractéristiques clés d'un espace central de caractéristique donnée, l'adaptation de solutions trouvées à des problèmes similaires pour proposer une nouvelle solution innovante pour une tâche de conception donnée. Le principe de base au sein de ce modèle est que la connaissance de différents cas à des différents niveaux peuvent être précisément exploré et intégré dans un processus de conception pratique. En outre, afin de démontrer l'importance pratique de notre modèle computationnel proposé, un système pour la conception des dispositifs électromagnétiques capable de générer un prototype de conception nouveau à partir d'une base de cas réel à haute dimensionnalité a été développé.
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10

Beach, Fred Charles. "Design and construction of a one meter electromagnetic railgun /." Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1996. http://handle.dtic.mil/100.2/ADA313134.

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Thesis (M.S. in Applied Physics) Naval Postgraduate School, June 1996.
"June 1996." Thesis advisor(s): R.M. Harkins, William Maier II, Xavier Maruyama. Includes bibliographical references. Also available online.
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Beach, Fred C. "Design and construction of a one meter electromagnetic railgun." Thesis, Monterey, California. Naval Postgraduate School, 1996. http://hdl.handle.net/10945/8211.

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Approved for public release; distribution in unlimited.
The acceleration of projectiles through the use of electromagnetic forces (Railguns) has many advantages over conventional methods. Foremost are the higher velocities which can be achieved and the reduction in firing platform sensitivity to hits. Projectile velocities on the order of 3-4 kilometers per second allow the use of 'kinetic energy kill' projectiles which are effectively inert munitions. Additionally, by using purely electromotive force for the acceleration, the need for explosive propellants is eliminated. A one meter Electromagnetic Railgun was designed and constructed to serve as a test bed for research into alternative armature materials, rail/armature plasma effects, and current pulse forming techniques. A modular approach was used to allow independent changes in power supply, pulse forming network, bore configuration, and gun augmentation.
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12

Davis, William L. "The design and construction of a small electromagnetic calorimeter." Virtual Press, 1992. http://liblink.bsu.edu/uhtbin/catkey/845946.

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Experiment 683, at Fermi National Accelerator Laboratory's Wide Band Photon Laboratory, is designed to study photon-hadron collisions at energies up to ~s = 27 GeV. The Wide Band Photon Lab currently the highest energy photon beam in the world. Several processes are to be studied. One such process in the quantum electrodynamic (QED) Compton effect. This paper is concerned with the design and construction of a small electromagnetic calorimeter (with embedded proportional wire chambers) to be used to aid in the study of the QED Compton effect. A theoretical description of the QED Compton effect is given. Basic principles of calorimetry, as it pertains to high energy physics, are discussed. Tests of the components used for construction of this device is discussed and results reviewed. The components include wavelength shifter, scintillator, photomultiplier tubes, and photomultiplier tube bases. Muon testing of this device is discussed also.
Department of Physics and Astronomy
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13

Cole, Gareth Douglas. "Design of an automated calibration device for electromagnetic tracking systems." Online access for everyone, 2007. http://www.dissertations.wsu.edu/Thesis/Spring2007/g_cole_050107.pdf.

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14

Song, Jun. "Electromagnetic simulation and design of etched diffraction grating demultiplexers." Doctoral thesis, KTH, Elektroteknisk teori och konstruktion, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4791.

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Among various planar lightwave circuits for multiplexing/demultiplexing in an optical communication system, etched diffraction gratings (EDGs) have shown great potential due to their compactness and high spectral finesse. Conventional numerical methods for grating simulation cannot be used to simulate an EDG demultiplexer of large size (in terms of the wavelength). In the present thesis, the polarization-dependent characteristics of an EDG demultiplexer are analyzed with a boundary element method (BEM) for both an echelle grating coated with a metal and a dielectric grating with total internal reflection (TIR) facets. For EDGs with metal-coated facets, we use a more effective method, namely, method of moments (MoM). Futhermore, a fast simulation method for EDGs with TIR facets is presented based on the Kirchhoff–Huygens principle and the Goos-Hänchen shift. This simple method has a good agreement with a BEM over a wide range of practical parameters of the device. Several novel designs are presented in order to improve the performances of EDGs. (1) By making some appropriate roughness on the surface of the shaded facets, the PDL of the demultiplexer can be effectively reduced over a large bandwith. (2) For EDGs based on Si nanowire structures, we compensate the polarization-dependent wavelength dispersion (PDλ) in the whole operational spectrum by introducing a polarization compensation area in its free propagation region. (3) An EDG demultiplexer with suppressed sidelobe is designed. The designed EDG demultiplexer can give a crosstalk as small as 50 dB in theory. (4) By chirping the diffraction order for each facet, we minimize the envelope intensity for the other adjacent diffraction orders to achieve a negligible return loss in a large spectral width. (5) A design for EDG demultiplexers is presented to obtain both large grating facets and a larger free spectral range (FSR) using the optimal chirped diffraction orders for different facets. The influences of the fabrication errors (e.g., rounded effect, surface roughness and point defect in the waveguide) on the performance (such as the insertion loss, the polarization dependent loss and the chromatic dispersion) of an EDG demultiplexer are also analyzed in detail. Silicon nanowire waveguides and related EDGs are studied. An EDG demultiplexer with 10 nm spacing is finally fabricated and characterized.
QC 20100910
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15

Dirks, Robert Michael Pierce Niles A. Mayo Stephen L. "Analysis, design, and construction of nucleic acid devices." Diss., Pasadena, Calif. : California Institute of Technology, 2005. http://resolver.caltech.edu/CaltechETD:etd-05242005-133116.

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Thesis (Ph.D.) -- California Institute of Technology, 2005.
Advisor names in the Acknowledgments pages of the thesis. Title from home page (viewed 07/07/2010). Includes bibliographical references. Includes bibliographic references.
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16

Vo, Quang Vinh 1959. "Case-based reasoning approach for the non-routine design of electromagnetic devices." Thesis, McGill University, 2000. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=36847.

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The ability to suggest a means of solving a novel problem through the remembering and recalling of previous experiences is a tenet of the Case-based reasoning (CBR) paradigm. This approach is well suited for the engineering design domain since an effective and efficient solution can often be synthesized based upon previous designs rather than starting from scratch.
Although significant advances have been made, this technique suffers disadvantages when dealing with complex design problems and novel situations. This thesis aims at automating CBR's adaptation mechanism, that up until now had yet to be fully explored, as a way for solving the non-routine design of complex structures such as electromagnetic devices.
We propose a system architecture that combines the strength of multiple reasoning paradigms built on top of CBR. It flexibly uses different knowledge sources, fully exploits its experiences, and provides a dynamic environment where different alternatives can be examined under different abstraction views. In addition, such a framework can be used to broaden the spectrum of design problem solving from routine and non-routine to future creative design.
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Lockwood, Michael R. "Design and construction of an expandable series trans-augmented electromagnetic railgun." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1999. http://handle.dtic.mil/100.2/ADA368136.

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Thesis (M.S. in Applied Physics) Naval Postgraduate School, June 1999.
"June 1999". Thesis advisor(s): William B. Maier, II, Andres Larraza. Includes bibliographical references (p. 49-50). Also available online.
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18

Al-Akayshee, Qasim Hamood. "Design, construction and operation of an A.C. side excited machine." Thesis, University of Bath, 1996. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.337822.

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19

Chin, Shaoan. "MOS-bipolar composite power switching devices." Diss., Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/54275.

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Two MOS-Bipolar composite power semiconductor switching devices are proposed and experimentally demonstrated. These devices feature high voltage and high current capabilities, fast switching speeds, simple gate drive requirements, savings in chip area, reverse bias second breakdown ruggedness and large safe operating areas. Application characteristics of the devices for high frequency power inverter circuits are discussed. Monolithic integration of the two composite devices are also proposed.
Ph. D.
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20

Adil, Farhan. "Offset reduction using floating-gate devices." Thesis, Georgia Institute of Technology, 2003. http://hdl.handle.net/1853/14945.

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Ezenekwe, Dan Emeka. "Design methodology of an air bearing system for multi-DOF spherical actuator motion control applications." Diss., Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/17861.

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Wang, Xiaoyang. "Design, Construction and Investigation of Synthetic Devices for Biological Systems." University of Cincinnati / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1314041031.

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Imam, Neena. "Analysis, design, and testing of semiconductor intersubband devices." Diss., Georgia Institute of Technology, 2002. http://hdl.handle.net/1853/15664.

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Sutcliffe, Laura Francesca Rose. "Environmentally conscious design of medical devices." Thesis, University of Cambridge, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.610758.

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Gyawali, Shashi Raj. "Design and construction of helmholtz coil for biomagnetic studies on soybean." Diss., Columbia, Mo. : University of Missouri-Columbia, 2008. http://hdl.handle.net/10355/5686.

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Thesis (M.S.)--University of Missouri-Columbia, 2008.
The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file (viewed on August 12, 2009) Includes bibliographical references.
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Dorica, Mark. "Novel electromagnetic design system enhancements using computational intelligence strategies." Thesis, McGill University, 2006. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=102972.

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This thesis presents a wide spectrum of novel extensions and enhancements to critical components of modern electromagnetic analysis and design systems. These advancements are achieved through the use of computational intelligence, which comprises neural networks, evolutionary algorithms, and fuzzy systems. These tools have been proven in myriad industrial applications ranging from computer network optimization to heavy machinery control.
The analysis module of an electromagnetic analysis and design system typically comprises mesh generation and mesh improvement stages. A novel method for discovering optimal orderings of mesh improvement operators is proposed and leads to a suite of novel mesh improvement techniques. The new techniques outperform existing methods in both mesh quality improvement and computational cost.
The remaining contributions pertain to the design module. Specifically, a novel space mapping method is proposed, which allows for the optimization of response surface models. The method is able to combine the accuracy of fine models with the speed of coarse models. Optimal results are achieved for a fraction of the cost of the standard optimization approach.
Models built from computational data often do not take into consideration the intrinsic characteristics of the data. A novel model building approach is proposed, which customizes the model to the underlying responses and accelerates searching within the model. The novel approach is able to significantly reduce model error and accelerate optimization.
Automatic design schemes for 2D structures typically preconceive the final design or create an intractable search space. A novel non-preconceived approach is presented, which relies on a new genome structure and genetic operators. The new approach is capable of a threefold performance improvement and improved manufacturability.
Automatic design of 3D wire structures is often based on "in-series" architectures, which limit performance. A novel technique for automatic creative design of 3D wire antennas is proposed. The antenna structures are grown from a starting wire and invalid designs are avoided. The high quality antennas that emerge from this bio-inspired approach could not have been obtained by a human designer and are able to outperform standard designs.
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Shetty, Reshma P. (Reshma Padmini). "Applying engineering principles to the design and construction of transcriptional devices." Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/44921.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Biological Engineering Division, 2008.
This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Includes bibliographical references (leaves 180-203).
The aim of this thesis is to consider how fundamental engineering principles might best be applied to the design and construction of engineered biological systems. I begin by applying these principles to a key application area of synthetic biology: metabolic engineering. Abstraction is used to compile a desired system function, reprogramming bacterial odor, to devices with human-defined function, then to biological parts, and finally to genetic sequences. Standardization is used to make the process of engineering a multi-component system easier. I then focus on devices that implement digital information processing through transcriptional regulation in Escherichia coli. For simplicity, I limit the discussion to a particular type of device, a transcriptional inverter, although much of the work applies to other devices as well. First, I discuss basic issues in transcriptional inverter design. Identification of key metrics for evaluating the quality of a static device behavior allows informed device design that optimizes digital performance. Second, I address the issue of ensuring that transcriptional devices work in combination by presenting a framework for developing standards for functional composition. The framework relies on additional measures of device performance, such as error rate and the operational demand the device places on the cellular chassis, in order to proscribe standard device signal thresholds. Third, I develop an experimental, proof-of-principle implementation of a transcriptional inverter based on a synthetic transcription factor derived from a zinc finger DNA binding domain and a leucine zipper dimerization domain. Zinc fingers and leucine zippers offer a potential scalable solution to the challenge of building libraries of transcription-based logic devices for arbitrary information processing in cells.
(cont.) Finally, I extend the principle of physical composition standards from parts and devices to the vectors that propagate those parts and devices. The new vectors support the assembly of biological systems. Taken together, the work helps to advance the transformation of biological system design from an ad hoc, artisanal craft to a more predictable, engineering discipline.
by Reshma P. Shetty.
Ph.D.
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Li, Min 1977 Apr 2. "Continuum design sensitivity analysis based force calculation in EM devices." Thesis, McGill University, 2007. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=111523.

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The continuum design sensitivity analysis (CDSA) has been applied to the magnetostatic and electrostatic force calculation. This method allows the computation of the net loading force on a body as well as the force distribution on the surface of the body. An algorithm for force calculation combined with a standard field analysis software package is presented. The efficiency and accuracy of the method is proved through the numerical implementation applied to a set of test examples. In addition, the new approach has several advantages over the traditional methods based on the Maxwell Stress Tensor, such as no air gap or artificial interference with the original model is required. Particularly, the performance analysis of a MEMS micro-mirror using CDSA torque calculation is conducted for the first time.
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Nguyen, Loc Bao. "Logic design using programmable logic devices." PDXScholar, 1988. https://pdxscholar.library.pdx.edu/open_access_etds/4103.

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The Programmable Logic Devices, PLO, have caused a major impact in logic design of digital systems in this decade. For instance, a twenty pin PLO device can replace from three hundreds to six hundreds Transistor Transistor Logic gates, which people have designed with since the 60s. Therefore, by using PLD devices, designers can squeeze more features, reduce chip counts, reduce power consumption, and enhance the reliability of the digital systems. This thesis covers the most important aspects of logic design using PLD devices. They are Logic Minimization and State Assignment. In addition, the thesis also covers a seldomly used but very useful design style, Self-Synchronized Circuits. The thesis introduces a new method to minimize Two-Level Boolean Functions using Graph Coloring Algorithms and the result is very encouraging. The raw speed of the coloring algorithms is as fast as the Espresso, the industry standard minimizer from Berkeley, and the solution is equally good. The thesis also introduces a rule-based state assignment method which gives equal or better solutions than STASH (an Intel Automatic CAD tool) by as much as twenty percent. One of the problems with Self-Synchronized circuits is that it takes many extra components to implement the circuit. The thesis shows how it can be designed using PLD devices and also suggests the idea of a Clock Chip to reduce the chip count to make the design style more attractive.
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Mathis, Andrew Wiley. "Electromagnetic modeling of interconnects incorporating perforated ground planes." Diss., Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/14822.

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31

SCHOENEMAN, DONALD WARREN. "COMPUTER-AIDED DESIGN OF THERMIONIC INTEGRATED CIRCUIT ACTIVE DEVICES." Diss., The University of Arizona, 1985. http://hdl.handle.net/10150/188077.

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Two computer-aided design methods are described in this dissertation for the design of Thermionic Integrated Circuits (TIC). Such circuits combine vacuum tube techniques with modern integrated circuit techniques to produce microminiature vacuum tube circuits, with possibly hundreds of vacuum triodes on a single substrate. The first method described in the line charge approximation technique in which the TIC devices are modelled as collections of line charges. A TIC is produced by evaporating metal electrodes on one or two sapphire substrates. The entire structure is heated to about 850°C so that electrons are emitted from the cathode electrodes to travel to the plate electrodes as in a conventional vacuum triode. The line charge approximation method is easy to implement and provides a simple means of satisfying the sapphire dielectric boundary conditions of the TIC basic problems, which are electrostatics problems since space charge effects are neglected. The method requires only a single matrix inversion and is a finite element Green's function approach. The method uses no iteration as in previous TIC analysis methods. Later as the development of TIC devices proceeded further it was found that conducting shields had to be placed over the unused sapphire surface so that the basic problem became a metal box problem. For this case a second method was developed called the step and ramp function method in which each electrode is modelled by a step function, which is the electric field solution for a potential step on a zero potential boundary. A superposition of these step functions models the TIC electrodes. The method provides direct calculation of the electric fields from equations and requires no iteration or matrix inversion. The potential variation between electrodes is modelled by linear potential functions called ramps. A superposition of steps and ramps completely specifies a TIC structure. The method does not solve for the case of electrodes which are elevated above substrates. For this case a modified line charge method was developed but not implemented.
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Chan, Yick-po, and 陳奕寶. "Advanced transformer construction techniques for electromagnetic interference reduction in switch mode power supplies." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2011. http://hub.hku.hk/bib/B47027484.

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33

Moghnieh, Hussein. "Design and analysis of low frequency electromagnetic devices: Exploring and exploiting parallelism on multi-core processors." Thesis, McGill University, 2013. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=114245.

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The design and analysis of low frequency electromagnetic devices on digital computers using the Finite Element Method (FEM) are computationally expensive and time-consuming. In the past decade, assiduous efforts have been dedicated to exploring and exploiting the parallelism of specific FEM kernels with the aim of enhancing their performance on multi-core processors. Despite having proved advantageous in promoting the speed of specific kernels, how this approach globally impacts the time duration required for the completion of the design process remains unclear, so is the question of whether such an approach takes full advantage of the capacity of multi-core processors. We attempted to overcome these caveats by applying a holistic approach that focuses on the parallel performance of key FEM components, mainly mesh generation, matrix assembly and Preconditioned Conjugate Gradient (PCG). Our investigation generated three main findings. First, we show that two factors, namely the degrees and exploitation techniques of parallelism differ among the kernels of the FEM solver component using PCG. This fact leads to low thread utilization and a waste of computational resources. Second, contrary to the notion that fine-grained multi-threaded algorithms, albeit involving much synchronization, do not affect the time efficiency of multi-core processors, we show that fine-grained multi-threaded algorithms can in fact be time costly in certain cases involving multi-core processors, particularly so when the ratio of computation runtime to synchronization runtime is relatively small. Third, we found the performance level of algorithms to be inversely related to the size of the problem, suggesting that using domain decomposition techniques to solve smaller problems is likely to pay off. These findings support the argument that instead of exploring parallelism in single components, a holistic approach focusing on the global design process would be more valuable.
La conception et l'analyse de systèmes électromagnétiques de basses fréquences sur un ordinateur numérique utilisant la méthode des éléments finis (MEF) est d'un point de vue informatique un processus onéreux qui demande du temps. Dans la dernière décennie, des efforts assidus ont été consacrés à l'exploration et l'exploitation du parallélisme des Kernel MEF spécifiques dans le but d'améliorer leur performance sur des processeurs multi-noyaux. Même s'il est avantageux de promouvoir la vitesse de Kernel spécifiques, comment cette approche impacte globalement la durée nécessaire à l'achèvement du processus de conception reste floue, c'est de même pour la question si cette approche profite pleinement des avantages des capacités du processeur multi-noyaux. Nous avons tenté de surmonter ces réserves en appliquant une approche holistique qui concentre sur la performance parallèle des Kernel MEF, surtout, la génération de mailles, l'assemblage matriciel, la multiplication de vecteurs matriciels parsemés et des techniques de préconditionnement fondées sur une factorisation LU inachevée.Notre enquête a généré trois conclusions principales. Premièrement, nous montrons que deux facteurs, à savoir les degrés et les techniques d'exploitation de parallélisme, différent entre les composantes Kernel du MEF solveur utilisant PCG. Ce fait mène à une faible utilisation du "thread" et à un gaspillage de ressources de calcul. Deuxièmement et contrairement à la notion que les algorithmes multi-thread de granularité fines, bien qu'ils impliquent beaucoup de synchronisation, n'affectent pas l'efficacité du temps de processeurs multi-noyaux, nous montrons que ces algorithmes, peuvent en fait être coûteux en temps dans certain cas impliquant des processeurs multi-noyaux, particulièrement lorsque le rapport d'exécution du calcul de la synchronisation d'exécution est relativement faible. Troisièmement, nous avons trouvé que le niveau de performance des algorithmes était inversement proportionnelle à la taille du problème, ce qui suggère que l'utilisation des techniques de "domain decomposition" sera advantageux.Ces résultats appuient l'argument selon lequel au lieu d'explorer le parallélisme dans les composants individuels, une approche holistique centrée sur le processus de conception globale serait plus utile.
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34

Braiwish, Mohammad I. "Fabrication and packaging of carbon-dioxide-laser-induced long-period fiber grating devices." Thesis, Georgia Institute of Technology, 2003. http://hdl.handle.net/1853/15033.

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35

Zhou, Mi. "Design of Tunable/Reconfigurable and Compact Microwave Devices." Thesis, University of North Texas, 2014. https://digital.library.unt.edu/ark:/67531/metadc500093/.

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With the rapid development of the modern technology, radio frequency and microwave systems are playing more and more important roles. Since the time the first microwave device was invented, they have been leading not only the military but also our daily life to a new era. In order to make the devices have more practical applications, more and more strict requirements have been imposed. For example, good adaptability, reduced cost and shrank size are highly required. In this thesis, three devices are designed based on this requirement. At first, a symmetric four-port microwave varactor based 90-degree directional coupler with tunable coupling ratios and reconfigurable responses is presented. The proposed coupler is designed based on the modified structure of a crossover, where varactors are loaded. Then, a novel reconfigurable 3-dB directional coupler is presented. Varactors and inductors are loaded to the device to realize the reconfigurable performance. By adjusting the voltage applied to the varactors, the proposed coupler can be reconfigured from a branch-line coupler (90-degree coupler) to a rat-race coupler (180 degree coupler) and vice versa. At last, two types (Type-I and Type-II) of microwave baluns with generalized structures are presented. Different from the conventional transmission-line-based baluns where λ/2 transmission lines or λ/4 coupled lines are used, the proposed baluns are constructed by transmission lines with arbitrary electrical lengths.
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36

Bodepudi, Srikrishna Chanakya. "Design and construction of ultrahigh vacuum system to fabricateSpintronic devices, fabrication and characterization of OMAR (organic magnetoresistance) devices." Thesis, Linköping University, Department of Physics, Chemistry and Biology, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-19583.

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This thesis concerns design and construction of an ultra high vacuum chamber to fabricate and characterize spintronic devices.  The long term intention is to fabricate spin valve structures with V[TCNE]2 (hybrid organic inorganic semiconductor room temperature magnet) sandwiched between two ferromagnetic electrodes, which requires better than 10-8mbar of vacuum. Due to an uncured leak in the chamber, the current vacuum is limited to 4*10-7mbar. The V[TCNE]2 thin film prepared in this vacuum, oxidized completely  by  the presence of oxygen during the film growth. Organic magnetoresistance (OMAR) devices which are simple organic diode structures were fabricated and characterized, as they are compatible with high vacuum conditions. A magnetoresistance measurement set up was arranged and the possible problems in fabrication and characterization are analyzed.

 

To fabricate OMAR devices-ITO/P3HT/Al, RR-P3HT (regio regular poly (3-hexylthiophene)) an effective hole transport polymer with higher hole mobilities was used as an active layer and Al (aluminum) as a cathode. A thermal evaporation setup was added to the vacuum chamber to evaporate Al electrodes. The devices were kept in argon and vacuum environments, while characterizing in dark to suppress the exitons generated by photo illumination. The Organic magnetoconductance of about 1% is observed for the less concentration P3HT (3mg/1ml), and significantly improved to -23% for the high concentration P3HT (10mg/ml) solution. The results support that the negative magnetoconductance is due to the formation of bipolaron under the influence of an external magnetic field.

 

Finally, suggestions to improve the performance of the vacuum chamber to fabricate and characterize the spintronic devices and OMAR devices are presented.

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37

Faircloth, Daniel Lee. "Novel techniques for the design and characterization of electromagnetic devices with application to multilayer structures and waveguide filter." Auburn, Ala., 2005. http://repo.lib.auburn.edu/2005%20Fall/Dissertation/FAIRCLOTH_DANIEL_32.pdf.

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38

Cho, Sang-Yeon. "High speed optical interconnection on electrical boards using embedded OE devices in polymer optical waveguides." Diss., Georgia Institute of Technology, 2003. http://hdl.handle.net/1853/14881.

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39

McCray, Thomas Wade. "Construction and characterization of removable and reusable piezoelectric actuators." Thesis, This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-06232009-063342/.

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40

Barnard, Damian Kelly. "Design and construction of modular genetic devices and the enzymatic hydrolysis of lignocellulosic biomass." Thesis, University of Edinburgh, 2012. http://hdl.handle.net/1842/7688.

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The enzymatic deconstruction of lignocellulosic plant biomass is performed by specialist microbial species. It is a ubiquitous process within nature and central to the global recycling of carbon and energy. Lignocellulose is a complex heteropolymer, highly recalcitrant and resistant to hydrolysis due to the major polysaccharide cellulose existing as a crystalline lattice, intimately associated with a disordered sheath of hemicellulosic polysaccharides and lignin. In this thesis I aim to transfer the highly efficient cellulolytic mechanism of the bacterium Cellulomonas fimi, to that of a suitably amenable and genetically tractable expression host, in the hopes of better understanding the enzymatic hydrolysis of lignocellulose. Using tools and concepts from molecular biology and synthetic biology, I constructed a library of standardised genetic parts derived from C. fimi, each encoding a known enzymatic activity involved in the hydrolysis of cellulose, mannan or xylan; three of the major polysaccharides present in lignocellulose. Characterization assays were performed on individual parts to confirm enzymatic activity and compare efficiencies against a range of substrates. Results then informed the rational design and construction of parts into modular devices. The resultant genetic devices were introduced into the expression hosts Escherichia coli and Citrobacter freundii, and transformed strains were assayed for the ability to utilize various forms of xylan, mannan and cellulose as a sole carbon source. Results identified devices which when expressed by either host showed growth on the respective carbon sources. Notably, devices with improved activity against amorphous cellulose, crystalline cellulose, mannan and xylan were determined. Recombinant cellulase expressing strains of E. coli and C. freundii were shown capable of both deconstruction and utilization of pure cellulose paper as a sole carbon source. Moreover, this capacity was shown to be entirely unhindered when C. freundii strains were cultured in saline media. These findings show promise in developing C. freundii for bioprocessing of biomass in sea water, so as to reduce the use of fresh water resources and improve sustainability as well as process economics. Work presented in this thesis contributes towards understanding the complementarities and synergies of the enzymes responsible for lignocellulose hydrolysis. Moreover, the research emphasizes the merits of standardizing genetic parts used within metabolic engineering projects and how adopting such design principles can expedite the research process.
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41

Hutson, D. "The design, construction and operation of practical thin film superconducting quantum interference devices (SQUIDs)." Thesis, University of Strathclyde, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.382345.

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42

Creyts, Don Stafford IV. "Design and fabrication of a MEMS magnetic bistable valve." Thesis, Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/17950.

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43

Hopkinson, David P. "Development of stress gradient enhanced piezoelectric composite unimorph actuators." Thesis, Georgia Institute of Technology, 2003. http://hdl.handle.net/1853/16372.

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44

Bushroe, Frederick Nicholas 1964. "An optical head for a magneto-optic disk test system." Thesis, The University of Arizona, 1989. http://hdl.handle.net/10150/277154.

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Design and operation of modular optical head for a magneto-optic test system are described. Alternate solutions to design problems are discussed. A 30mW semiconductor laser with an integrated 250MHz oscillator is selected. The oscillator is used to modulate laser read current for a reduction in laser feedback noise. A collimating lens with an appropriate focal length is chosen so the beam's truncation at the objective yields the maximum write power density. Astigmatism associated with the laser diode is reduced to 0.125 waves by defocusing the collimating lens and circularizing with an anamorphic prism pair. Head components are aligned within several minutes of arc by using alignment apertures and an autocollimator. Aberrations due to tilt between the disk and beam are examined and coma is found to be the major contributor.
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45

Rojanapornpun, Olarn Electrical Engineering &amp Telecommunications Faculty of Engineering UNSW. "Microfabrication technology for an integrated monolithic electromagnetic microactuator based on polymer bonded permanent magnet." Awarded by:University of New South Wales. School of Electrical Engineering and Telecommunications, 2006. http://handle.unsw.edu.au/1959.4/27014.

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Electromagnetic microactuators with permanent magnets have many potential applications such as micro-energy scavengers, microswitches, micromirrors and microfluidics. However, many electromagnetic microactuator designs utilize either external permanent magnet or external coil, which do not allow tight integration to other MEMS components and further miniaturization. Furthermore, all of the available permanent magnet microfabrication technologies have some drawbacks and improvements are required. Thus the integrated monolithic electromagnetic microactuator is investigated in this project. The three main components of the electromagnetic actuator have been investigated separately. A novel microfabrication technology called ???Template printing???for the fabrication of polymer bonded permanent magnet has been investigated and developed. It is based on ???Screen printing??? which has its drawbacks on alignment accuracy and poor line definition. This is eliminated in ???Template printing??? by photolithography of the photoresist template. The shape and location of the permanent magnet is defined by the template. A new approach based on the filling of dry magnetic powder and vacuum impregnation has been developed to form the polymer bonded permanent magnet. This allows the use of short pot-life matrix material and the elimination of homogenous mixing. A monolithic electromagnetic microactuator has been fabricated successfully. It consists of a 2-layer planar copper microcoil, surface micromachined polyimide beam and Strontium ferrite/EPOFIX permanent magnet (diameter of 460 ??m and 30 ??m thickness). Large deflection in excess of 100 ??m at 35 mA driving current and magnetic force of 0.39 ??N/mA have been achieved. It compares favourably with other much larger electromagnetic actuators that have been reported. ???Template printing??? has the potential of being a low temperature batch process for the microfabrication of thick polymer bonded permanent magnets with high magnetic properties and low residual stress. The fabrication consistency and the quality of template printed magnet can be improved in future studies.
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Oates, William Sumner. "Piezoelecytric pump design and system dynamic model." Thesis, Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/17679.

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47

Poddar, Ravi. "Accurate, high speed predictive modeling of passive devices." Diss., Georgia Institute of Technology, 1998. http://hdl.handle.net/1853/14905.

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48

Sgambato, Kristopher. "Design and Testing of a Lateral Field Excited Rate Monitor for Use in Thin Film Deposition Systems." Fogler Library, University of Maine, 2009. http://www.library.umaine.edu/theses/pdf/SgambatoK2009.pdf.

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49

Michaelides, Stylianos. "Physics-based process modeling, reliability prediction, and design guidelines for flip-chip devices." Diss., Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/16028.

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50

Pierce, Robert Scott. "A method for integrating form errors into tolerance analysis." Diss., Georgia Institute of Technology, 2003. http://hdl.handle.net/1853/34104.

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