Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 47 for “"Modeling and Characterization"”.
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Modeling and characterization of nanoelectromechanical systems
… are used commercially in sensor applications and in recent years much research effort has been done to implement them in wireless communication. Electron beam lithography and other advancements in fabrication technology allowed to shrink the size of MEMS to nanomechanical systems (NEMS). Since …
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Modeling and Characterization of Heterojunction Bipolar Transistors
… from the use of semiconductors in the emitter and base with different bandgaps. These advantages include high current gain, large cut-off frequency and short gate delay in digital logic circuits. This thesis selects a few important and critical issues connected with the operation of HBTs with a …
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Modeling and characterization of microelectromechanical systems condenser microphone
… promising technology to substitute the current standard microphones as they have several benefits such as batch fabrication, integration feasibility, low noise level, stable frequency response and high sensitivity; so their demand is increasing and is therefore studied by many researchers. This …
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DESIGN, COMPACT MODELING AND CHARACTERIZATION OF NANOSCALE DEVICES
Electronic device modeling is a crucial step in the advancement of modern nanotechnology and is gaining more and more interest. Nanoscale complementary metal oxide semiconductor (CMOS) transistors, being the backbone of the electronic industry, are pushed to below 10 nm dimensions using novel …
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Modeling and characterization of a voice coil motor
… of the motor based on the material properties and geometry. An optimized geometry is modeled using finite element analysis, which predicts a motor constant of 11.02 N/[the square root of]W. The motor is fabricated and characterization reveals it to have a motor constant of 8.43 N/[the square …
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Multiscale Numerical Modeling and Characterization of Carbon/Carbon Composites
… material with a unique set of physical and thermo-mechanical properties making it irreplaceable for severe environment aerospace applications. Its complex hierarchical microstructure presents materials scientists and engineers with substantial modeling challenges when it comes to …
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Modeling and characterization of thermoelectric properties of SiGe nanocomposites
Direct energy conversion between thermal and electrical energy based on thermoelectric effects is attractive for potential applications in waste heat recovery and environmentally-friendly refrigeration. The energy conversion efficiency is related to the thermoelectric figure of merit ZT, which is …
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Advanced numerical modeling and characterization of infrared focal plane arrays
… HgCdTe features a widely tunable, direct bandgap from the ultraviolet to very long wavelength IR, lattice matched substrates, excellent quality epitaxial layers, and long minority carrier lifetimes. The requirements for better HgCdTe device performance are driving advancements in numerical …
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Modeling and characterization of strained quantum-well lasers and modulators
Strained quantum-well lasers and modulators are studied in this dissertation. Both dc and high-speed performances of these two devices are studied. Theoretical models are developed, and we show very good agreement between the theoretical and experimental results.
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Physics Based Modeling and Characterization of Filament Extrusion Additive Manufacturing
Additive manufacturing (AM) is a rapidly growing and evolving form of product development that has the potential to revolutionize both the industrial and academic spheres. For example, AM offers much greater freedom of design while producing significantly less waste than most traditional …
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Quantitative modeling and characterization of hydrodynamics and transport in multiphase microreactors
… has advanced rapidly in recent years as a fast and effective means to discover and screen suitable reaction candidates for continuous production. Among the many chemical reactions, multiphase reactions constitute a major category with important industrial applications, and microreactors have …
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Modeling and characterization of ionic polymer transducers for sensing and actuation
… to convert energy between chemical, electrical and mechanical domains, these materials offer potential for use in numerous engineering applications. The research presented in this dissertation focuses primarily on the electromechanical coupling that exists within these ionic polymer materials. …
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Modeling and characterization of elastic wave propagation in micro-scale photonic crystals
… structure. Such devices exhibit elastic bandgaps, which are very useful in many commercial applications. Filtering, guiding and mirroring of elastic waves are a few applications in which phononic crystals can be used. In this manuscript, the physical origins of phononic bandgaps were …
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Ultra thin micro solar cells with concentration optics: fabrication, modeling and characterization
… crystalline semiconductor, their price is high, and for low cost cells, such as organic PV, their efficiency is not sufficient. One way of reducing the cost is to replace expensive semiconductor material with relatively cheaper optics, a solar concentrator, and reduce the size of the active …
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Simulation, Modeling, and Characterization of the Wakes of Fixed and Moving Cylinders
… algebraic equations, which produce the lift and drag coefficients on a cylinder or a cylinder-like structure. We introduced an improved wake oscillator for the lift, which combines the van der Pol and Duffing equations. We proposed a two-term quadratic model that relates the drag and lift …
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Modeling and characterization of non-ideal effects in high-performance RF MEMS tuners
<p>The emerging standards for the next-generation wireless communication system demand for multi-band RF front-ends. Reconfigurable RF devices based on MEMS technology have emerged with the potential to significantly reduce the system complexity and cost. Robust operation of RF MEMS tuners under …
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The modeling and characterization of a Lorentz-force actuator for needle-free injection
… a new Lorentz-force actuator was designed and modeled using finite element analysis software. The new magnetic configuration included a radially-magnetized ring that generated a larger magnetic field across the airgap of the Lorentz-force actuator. Calculated peak forces were between 400 N …
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Modeling and Characterization of Power Electronic Converters with an Integrated Transmission-Line Filter
In this work, a modeling approach is delineated and described in detail; predominantly done in the time domain from low frequency, DC, to high frequencies, 100 MHz. Commercially available computer aided design tools will be used to determine the propagation path in a given structure. Next, an …
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Modeling and Characterization of Friction Stir Fabricated Coatings on Al6061 and Al5083 Substrates
… written in Wolfram Mathematica® 7 for Students, and allows for time-efficient calculation of thermal profiles. The non-dimensionality of the model allows for accurate refinement of the temporospatial mesh, and provides portability across material types. The model provides insight as to the …
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