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 35 for “"differential resistance"”.
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Macrophage cytokines as correlate of differential resistance to African trypanosomiasis
… suggests that macrophages play a central role in resistance to trypanosomiasis. The expression of mRNA and/or production of cytokines (IL-6, IL-10, TNF-α, TGF-β1 and IL-12) and nitric oxide (NO) by macrophages from C57Bl/6 and BALB/c mice in response to 'T. congolense' or 'T. brucei' were studied. …
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Investigation of Negative Differential Resistance Phenomena in Quantum Well Heterostructures
… well heterostructures and led to the negative differential resistance observation is presented. Using the Hall effect measurement technique, the mobility and carrier concentration were measured and analyzed by considering different scattering mechanisms and carrier thermal activation phenomena, …
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Gate current modeling of tunneling real-space transfer transistor with negative differential resistance
… gate current is introduced to obtain a negative differential resistance (NDR) on a dual-channel tunneling real-space transfer transistor (TRSTT). The device was fabricated on a GaAs (100) substrate with a GaAs/InGaAs/GaAs straddling heterostructure. According to the experimental data reported by …
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Transverse and Longitudinal Tunneling in Confined Heterostructures
… of electrons and holes to exhibit negative differential resistance (NDR) via tunneling.
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Point contact studies of rare earth-transition metal compounds
… ErFe2/YFe2 multilayer at 4.2K show a step in the differential resistance at a positive current value. It is suggested that this is due to the formation of a nano-domain beneath the tip. Measurements of a DyFe2/YFe2/DyFe2 tri-layer show peaks in differential resistance for negative applied …
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Modeling optically activated high power semiconductor switches
… recombination radiation transport, and negative differential resistance. The model has the ability to address different switch geometries and the consequences of nonuniformities in carrier injection, permittivity, and illumination of the sample on switch operation.
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Wide-Bandgap III-Nitride Tunnel Junctions and Novel Approaches towards Improving Optoelectronic Devices
… levels and even with delta doping. Negative differential resistance is measured at a low peak voltage of 1.3 V, and is measurable down to cryogenic temperatures as low as 77 K. Tunnel junctions are then demonstrated as tunnel contacts to p-i-n diodes exhibiting a state of the art low voltage …
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Electrical parasitics and parameter extraction of photonic crystal vertical-cavity surface-emitting lasers
… Photonic crystal designs are found to have low differential resistance, but high parasitic capacitance. By including a diffusion capacitance term in the modulation response equation, scattering parameter fitting suggests the diffusion capacitance to be the limiting factor of intensity …
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Investigating the properties of molecular wires on gold and diamond
… conductivity, rectification and negative differential resistance in the transition metal-OPP molecular films. In Chapter 4, theoretical simulations of the molecular wires based on the first-principles density functional theory and non-equilibrium Greenb s function revealed electrical …
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Electrical and optical properties of carbon nanotube intra-connects and conductive polymers
… been shown to correlate with a novel negative differential resistance (NDR) effect. Electroplated intraconnects exhibited unique properties both for multi-walled and single-walled carbon nanotube channels.
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Monte Carlo Calculations of Parallel and Perpendicular Electron Transport in Gallium-Arsenide Heterolayers
… ideas such as scattering induced negative differential resistance.
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Low frequency charge-density wave dynamics
… of the fluctuations in the voltage and the differential resistance revealed a theory of threshold voltage fluctuations can only partially describe some of the fluctuations in the I-V curve. Noise measurements performed with an ac drive current characterized the fluctuations and showed that …
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Quantum transport of electrons through graphene and carbon nanotubes
… source and drain shows a peculiar negative differential resistance behavior (NDR) while drawing current- voltage characteristics. This property is used in many electronic devices. The main feature of graphene is that the electron has zero effective mass at Dirac points, but gains mass when …
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Design, synthesis, and testing of novel organic oligomers for use as molecular-scale electronic devices
… to elucidate switching mechanisms and negative differential resistance behavior thought to be based on molecular conformational changes.
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Investigations of Crossed Andreev Reflection in Hybrid Superconductor-Ferromagnet Structures
… critical temperature of the superconductor, the resistance versus temperature curves show re-entrant behavior, with the signal corresponding to antiparallel alignment of the magnetization of ferromagnetic wires distinctly larger than that of the parallel case. We discuss one possible explanation …
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Uniaxial Strain Effect on Graphene-Nanoribbon Resonant Tunneling Transistors
… show the resonant tunneling and strong negative differential resistance (NDR). These devices which have potential for future high-frequency and logic applications such as high-speed IC circuits, signal generators, data storage, etc., has been studied both theoretically and experimentally …
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Characterization of the chitinolytic system during the mycoparasitic interaction between Trichoderma aggressivum f. aggressivum and different host strains of Agaricus bisporus /
… specifically on chitinase involvement in the differential resistance of white, off-white, and brown commercial mushroom strains. Chitinases isolated from cultures of A. bisporus and T. aggressivu11l grown together and separately, were identified following native PAGE, and analysis of …
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Cryogenic operation of silicon-germanium heterojunction bipolar transistors and its relation to scaling and optimization
… theory is used to investigate a novel negative differential resistance (NDR) effect and a collector current kink effect in first-generation SiGe HBTs at deep cryogenic temperatures. A theory of positive feedback due to the enhanced heterojunction barrier effect at deep cryogenic temperatures is …
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Electronic properties and device applications of rotationally controlled van der Waals heterostructures
… resonant tunneling, manifested by negative differential resistance, which stem from energy and momentum conservation. Because WSe₂ possesses strong spin-orbit coupling which leads to coupled spin-valley degrees of freedom, controlling the angle between the two WSe₂ monolayers allows us to …
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Advances in molecular scale electronics: Synthesis and testing of nanoscale wires and devices
… tested nanoscale devices that exhibit negative differential resistance with a valley to peak ratio of over 1000:1 that is 10 times that of current solid-state devices and shown long lasting random access memory. The use of these molecular scale wires and devices should allow us to overcome the …
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