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 41 for “"drift velocity"”.
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Studies on a microwave dragging technique for measuring electron drift velocity
… is concerned with the measurement of electron drift velocity in the positive column of an unmagnetized, low pressure, arc discharge using a microwave dragging technique based on Fizeau's famous experiment. The discharge is analyzed as if it were a cold plasma drifting with a velocity equal to …
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Measurement of electron drift velocity in MOSFET inversion layers at high electric fields
Thesis: M.S., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 1986
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The electromigration drift velocity and the reliability of dual-damascene copper interconnect trees
… precedes all failure modes, electromigration drift velocity measurements were carried out using fully processed interconnect structures. It was observed that in a significant fraction of the test population, the resistance of the lines increased steadily over time prior to failure.
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Estimation of ion drift velocity vector in F region ionosphere based on incoherent scattered pulse data using machine learning technique
… thesis presents work on estimating the vector drift velocities of the plasma at different altitudes in the F region of the ionosphere using machine learning techniques. The computation is based on the radar data acquired with the ALTAIR (Automatic Radar Plotting Aid (ARPA) Long-Range Tracking …
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Numerical Simulation of Turbulent Particle Diffusion
… a modified Markov chain based on a normalized velocity fluctuation was found to be important to avoid unphysical wall-ward particle fluxes. Also, the incremental drift velocity for the Markov chain (required for inhomogeneous turbulent flows) was extended to include effects of particle inertia …
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Mobility and Saturation Velocity in Graphene on Silicon Dioxide
… from 300 to 500 K. In addition, electron drift velocity is obtained at high electric fields up to 2 V/μm, at both 80 K and 300 K. Mobility displays a peak vs. carrier density and decreases with rising temperature above 300 K. The drift velocity approaches saturation at fields >1 V/μm, …
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Stochastic modelling of contaminant transport in porous media
… medium as stochastic variation of the fluid velocity, produced by pore wall impacts. This gives a stochastic differential equation for fluid displacements, and solute transport is obtained as the cumulative effect over all realisations of the stochastic path. It is shown that applying …
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Geometric Squeezing of a Degenerate Fermi Gas
… its Hall response, analogous to the 𝐸 × 𝐵 drift of charged particles in crossed electric and magnetic fields. We then detail the realization of a geometrically squeezed state of a rapidly rotating, non-interacting atomic Fermi gas and the measurement of its Hall drift velocity. The Fermi …
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Relation of electron scattering cross-sections to drift measurement in noble gases
… of electron swarms, focusing on their drift velocity and informational entropy, providing justification for a set of analytic expressions for drift measurements which are valid in the hydrodynamic regime. These expressions are then used to estimate the ⁴He scattering cross section, …
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An experimental investigation of the Buneman instability
… 650 V/m) is applied to accelerate electrons to a drift velocity vD much larger than the initial thermal velocity VTH. The device has a major radius of 19 cm and a minor radius of 3 cm, and a plasma having an electron density of 4 x 1016 ~ 1.2 x 1017 m-3 is prepared by rf ionization in a toroidal …
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High-field transport in two-dimensional graphene and molybdenum disulfide
… yet practical models for heating and high-field drift velocity in graphene, including the roles of both temperature and carrier density. We find that transport in supported-graphene devices does not resemble that of ideal graphene, indicating that interactions with the underlying SiO2 play a role …
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A 3-D Model of the Auroral Ionosphere
… of plasma in producing structures in density and drift velocity profiles.</p>
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Inversion of Arecibo incoherent scatter radar coded long pulse backscatter spectra
… techniques including the inversion of ion drift velocity using measured spectra ACF are discussed.
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Calibrating and recommissioning the ALICE transition radiation detector
… packages to remote repositories. Secondly, drift velocity and $E times B$ calibration software was developed and tested on Run 2 data. A mean angular resolution of 2.6$^circ$ was achieved. This was found to be within a range of a previous result that could be plausibly explained by a number …
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Development of InP DHBT for 5G millimeter-wave power amplifier and GaAs photodetector for 50 Gb/s optical link
… of the breakdown field and fast electron drift velocity make this material one of the suitable candidates when it comes to power amplifier applications within millimeter-wave spectrums. In this work, the development of the 50 Gb/s P-i-N photodetector Type-II InP DHBT for 5G power amplifier …
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Effects of mechanical properties on the reliability of Cu/low-k metallization systems
… growth, correlates with the electromigration drift velocity. Diffusive measurements made in this fashion are more fundamental than lifetime measurements alone, and correlate with the combined effects of the electron wind and the back stress forces during electromigration induced void growth.
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Electrical and thermal transport in 2D materials: role of environment and imperfections
… heating can lead to negative differential drift velocity (with respect to the electric field), which can be controlled by changing the underlying dielectric thermal properties or thickness. Graphene on BN exhibits the largest high-field drift velocity, while graphene on HfO2 has the lowest …
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Pulse Coding for ionospheric radar
… of the ionosphere, such as virtual height, drift velocity, angle of arrival, echo intensity, etc. It is mainly composed of a control platform (like a personal computer PC), the plug-in DDS (Direct Digital Synthesizer) board and receiver board, the power amplifier, and the antennas. This …
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Ion mobility in liquid He[superscript 3] below 1°K
… was obtained by directly measuring their drift velocity using a time of flight technique which involved a multigrid system of electrodes. Details of the experimental procedures as well as of the experimental apparatus and its construction are given. The positive ion mobility, ~+, was found …
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The NICE-OHVMS technique: realizing the full potential of precision molecular ion spectroscopy
Noise Immune Cavity Enhanced Optical Heterodyne Velocity Modulation Spectroscopy (NICE-OHVMS) is one of the most sensitive spectroscopic techniques specific to molecular ions. NICE-OHVMS relies on the combination of three separate techniques, each of which is a powerful tool. Cavity enhancement …
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