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 263 for “"To 500"”.
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GaN Electronics for High-Temperature Applications
… for harsh environment electronics, thanks to its excellent material properties, which have given rise to high-performance (room temperature) transistors for RF, power, MEMS, and mixed-signal applications. Previous works on high-temperature (HT) electronics have been typically limited to two …
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Measurement of cosmic antiprotons with the alpha magnetic spectrometer aboard the International Space Station
A precision measurement of the cosmic antiproton ( -p) flux and the antiproton-to-proton flux ratio ( -p/p) made with the Alpha Magnetic Spectrometer aboard the International Space Station is presented. The measurement covers the absolute rigidity range from 1 to 450 GV, and is based on 3.49x105 -p …
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Structural, electrical and optical properties of transparent conducting Si-doped ZnO thin films grown by pulsed laser deposition
… silicon doped zinc oxide films were ablated onto borosilicate glass substrates by pulsed laser deposition of a bulk ZnO target doped with 2 wt% silicon. The rotating target was irradiated at low ambient oxygen pressures by a KrF Excimer laser (Lambda physics LPX 300) emitting pulses of 0.18 ns …
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Development and modelling of weld cooling time equations.
… cooling time equations. This is an important topic as the susceptibility of a weld's heat affected zone to hydrogen cracking is largely governed by the severity of the cooling portion of the weld's thermal cycle. The 800 to 500 °C cooling time is particularly critical. A model to link the weld …
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The development of an in-situ X-ray diffraction cell for Fischer-Tropsch catalyst characterisation
… the direct observation of crystallite changes to be made under reaction conditions and in real time. The cell permits operation up to 500°C and 25 bar to be realised, with more severe conditions being achievable upon changing the reactor component. The design is such that it can be mounted to …
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A precision measurement of the cosmic ray positron fraction on the International Space Station
… particle physics experiment in space aiming to study dark matter, antimatter, and properties of cosmic rays to the TeV energy scale. This thesis presents a study of the cosmic ray positron fraction in AMS-02 data covering an energy range of 0.5 GeV to 500 GeV, and identifies 10.3 x 106 …
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Native oxidation of aluminum-bearing III-V semiconductors with applications to edge- and surface-emitting lasers and to the stabilization of light emitting diodes
… work, a water vapor oxidation process is used to convert high Al composition $\rm Al\sb{x}Ga\sb{1-x}As$ to a stable native oxide. The native oxides described are formed at temperatures in the range of 400$\rm\sp\circ C$ to 500$\rm\sp\circ C.$ Some of the basic properties of the native oxide are …
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Investigation of dense plasma under a strong electric field
… been investigated under electric fields of 100 to 500 V/cm. A pinch of pinch ratio ~ 3 was found to be hydrodynamically stable for ~ 2~s during which the experiment was performed. A sharp burst of runaway electrons of total current of the order of amperes occured and disappeared shortly after …
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The effects of radiation on pregermination plant seeds
… barley and alfalfa. Barley seeds soaked for up to 16h prior to irradiation were given doses of gamma radiation up to 100 Gy, and alfalfa seeds soaked for up to 24h were given doses up to 500 Gy. The mean postgermination growth of barley and alfalfa seeds decreased with increasing radiation dose. …
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Light induced degradation in hydrogenated amorphous silicon (a-Si:H)
… at different temperatures ranging from 250°C to 500°C are investigated. Light soaking experiments were carried out using a mirrored chamber with a metal halide lamp.
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A detailed petrographic and oxygen isotope study of metamorphic rocks and archean basement complex Gneisses from the Vredefort dome, South Africa
… Group in the collar of the Vredefort dome, to granulite grades in the core ofthe dome. In the collar, two metamorphic assemblages have been identified, one representing a peak metamorphic event pre-impact in age and constrained to temperatures >420-620°C at 3.0-4.0 kbar, and a younger …
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Examining celestial polarization with the Gamma Ray Polarimeter Experiment (GRAPE)
… Experiment (GRAPE), which is designed to measure the polarization of astronomical sources from 50 keV to 500 keV, and presents the Crab observation results from the successful 2011 balloon campaign. The successful balloon flight of this instrument took place on September 23rd and 24th, …
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Authorship Attribution on the Enron Email Corpus
… each email: Tiny (≤ 99 characters), Small (100 to 500 characters), Medium (501 to 999 characters), and Large (≥ 1000 characters). The Java Graphical Authorship Attribution Program (JGAAP software) from our Evaluating Variations in Language Laboratory (EVL Lab) was used to perform these tests. …
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Dielectric dispersion of poly(vinyl acetate) solutions
… acetate) solutions was studied in an attempt to relate this behavior to the chemical nature of the material. The bridge method was employed in which capacitance measurement of solutions were made over a frequency range of 400 cycles to 500 kilocycles. The results of these experiments indicate …
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Analysis of Creep Behavior and Parametric Models for 2124 Al and 2124+SiC Composite
… whiskers was studied at temperatures from 250 F to 500 F. Tensile tests were conducted to determine the basic mechanical properties, and microstructural and chemical anyalyses were performed to characterize the starting materials. The creep, tensile, and microstructural data for the 2124+SiC …
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Optimization of plastic scintillator thicknesses for online beta detection in mixed fields
… Monte Carlo simulation models have been built to optimize the thickness of a plastic scintillator, used in whole body monitor. The simulation has been performed using MCNP/X code and different thicknesses of plastic scintillators ranging from 150 to 600 um have been used. The relationship …
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Structure and Phase Transformation of Nanocrystalline and Amorphous Alloy Thin Films
… Ag cluster sizes increase from 2.5 nm to 3.5 nm as annealing temperature increases from room temperature to 500°C, and the cluster densities decrease accordingly from 2.5x10 4/mum2 to 7.6x103/mum 2. This phenomenon can be explained by grain growth and Ostwald ripening in which big …
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The meaning and practical significance of the cohesion intercept in soil mechanics
… has resulted in a data base on both the laboratory measured cohesion intercept, c$\sp\prime$, and field mobilized cohesion intercept, c$\sp\prime$(mob). The data base includes values of c$\sp\prime$ and c$\sp\prime$(mob) for over 300 natural deposits throughout the world. The soils which …
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Size adjustable separation of biologically active molecules
… technologies addressing this problem require too many techniques, toxic additives, and time to filter desired materials. As a result, a new technology is needed. The objective of this thesis is to contribute towards the development of a new method for separating biologically active molecules …
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An experimental study of fretting corrosion at a bearing/cartridge interface
A device has been built to study fretting corrosion phenomena at a bearing/cartridge interface. The research is a continuation of a larger study funded by the Naval Research Laboratory. Its main objective is to determine the important parameters influencing fretting and fretting corrosion in …
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