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.
Results
Showing 1 to 20 of 67 for “"active devices"”.
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Characterization and Modeling of High-Switching-Speed Behavior of SiC Active Devices
… of the emerging silicon carbide (SiC) devices, two SiC active switches, namely 1.2 kV, 5 A SiC JFET manufactured by SiCED, and 1.2 kV, 20 A SiC MOSFET by CREE, have been investigated systematically in this thesis. The static and switching characteristics of the two switches have firstly …
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MICROWAVE ACTIVE INDUCTOR ANALYSIS AND DESIGN
… integrated circuit technology, the microwave active inductor is gradually being used as a substitute for spiral inductor in microwave integrated circuit design. The aim is to reduce the microwave integrated circuit size and to achieve a better quality factor, more broadband and higher value …
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Rare earth-based active optical fiber device development
… development of rare-earth-based optical fiber active devices. The properties of the neodymium ion are analyzed and related to its potential role in the operation of various active optical devices. Existing technology in rare-earth-based fiber amplifiers is reviewed. Novel techniques for the …
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Integración de elementos activos en estructuras SIW
… This thesis studies the viability of integrate active devices on SIW structures, Substrate Integrated Waveguide. First, the SIW technology has been extensively analysed, to understand its internal behaviour and its topology limitations that make the direct polarized devices integration on its …
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Understanding electrochemistry at the Molecular scale : molecular dynamics methods and applications
… of constant potential, electrochemically active devices and use these methods to reveal the importance of molecular character on nanoscale device behavior. For example, a macroscopic relationship between transference number and battery performance is shown not to hold up in nanoscale cells …
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The design and control of active ankle-foot orthoses
… gait. Existing AFO technologies include passive devices with fixed and articulated joints, semi-active devices that modulate damping at the joint and active devices that make use of a variety of technologies to produce power to move the foot. Emerging technologies provide a vision for fully …
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From self-assembly to communications via machine washable fibers
… methods, yielding kilometers of functional fiber devices. Co-draw of different materials is possible for numerous material combinations and sizes, where one of the limiting factors to a continuous feature size in fibers is the Rayleigh-Plateau capillary instability. In my thesis I have shown that …
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Radio frequency power amplifiers for portable communication systems
… Effect Transistor (MESFET) are evaluated as active devices in high-efficiency RF PA designs. Two amplifier classes (class CE and class F) meet the system requirements of an 850 MHz operating frequency, a power output of 3 W, a battery supply voltage of 9 Vdc, and a sinusoidal-type signal to …
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AIDS Coalition to Unleash Power: Changing through movement, leadership, and Internet capabilities
… between the Internet (passive) and humanistic (active) devices. In mapping ACT UP's use and misuse of leadership and communication, this study will provide a clear view of the path ACT UP has taken, in addition to posing a better way of promoting information to current audiences.
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Selected topics on advanced electron devices and their circuit applications
Selected topics on advanced modern electron devices have been studied in this thesis, including both active devices and passive devices.I part I, a systematic study of Negative Bias Temperature Instability (NBTI) in p-MOSFETs with ultra-thin SiON gate dielectric is reported. By using the fast …
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Novel Methodologies and Measurement Software for Transistor Amplifier Synthesis in Planar Coupled -Transmission Lines
This thesis concerns the synthesis of active devices in coupled-microstrip and coupled-coplanar technology. We first discuss several aspects of multiconductor transmission line (MTL) theory, including longitudinal dependencies of immittance functions. We next describe a frequency domain normal mode …
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Block copolymer photonic crystals : towards self-assembled active optical elements
… achieved yet in terms of realizing optically active devices using these materials. [n this thesis, the utilization of block copolymer photonic crystals for creating self-assembled active optical elements has been experimentally explored with a special emphasis on optically driven lasing and …
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TCAD-Informed Surrogate Models of Semiconductor Devices
… half-century to develop models of semiconductor devices for use in circuit analysis and simulation. Such models typically fall into one of two categories: “Cheap” analytical models that can be solved quickly but introduce significant error, and “expensive” physics-based models that achieve high …
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Finite difference time domain analysis of microstrip antenna-circuit modules
… fringing fields and the nonlinearities of active devices must be addressed. In this work, the FDTD method was used because it can provide the framework for inclusion of circuit elements in a full wave calculation. A software tool was developed and validated based on this method. The modules …
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Photothermal energy conversion by plasmonic nanoparticles
… conversion is important when designing optically active devices based on plasmonic nanoparticles. Many early applications of these nanoparticles, like photothermal tumor ablation, drug delivery, and microfluidic devices, depend on the conversion of light to heat. In this dissertation, we compare …
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Online learning algorithm for structural control using magnetorheological actuators
Magnetorheological actuators are promising devices for mitigating vibrations because they only require a fraction of energy for a similar performance to active control. Conversely, these semi-active devices have limited maximum forces and are hard to model due to the rheological properties of their …
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New Forms of Defect Engineering in Silicon and Metal Oxide Semiconductors
… semiconductors, affect the performance of photo-active devices, the effectiveness of catalysts, the sensitivity of solid-state electrolyte sensors, and the efficiency of devices for converting sunlight to electrical power. Current methods for controlling defect behavior suffer from problems with …
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Laser micromachining of active and passive photonic integrated circuits
… photomask steps. For passive photonic devices fabrication, a novel femtosecond laser with unprecedented low repetition rates of 4 MHz is demonstrated to generate high intensity pulses, as high as 1.25 MW with 100 nJ pulse energies and 80 fs pulse durations directly from this laser …
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