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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.

Monte Carlo studies of ionized impurity scattering in silicon and silicon-germanium alloys

Kay, Leonard Edward 01 January 1991 (has links)
An improved Monte Carlo model for ionized impurity scattering is developed and applied to transport problems in Si and the Si$\sb{1-x}$Ge$\sb x$ alloy system. The model includes scattering cross sections derived from phase-shift analysis, implementation of the Friedel Sum Rule, and a simple phenomological model for multiple-potential scattering. Using a single adjustable parameter, majority and minority electron mobilities are calculated for Si and fit to experimental data. Experimental results for Si of $\mu\sb n(N\sb A)/\mu\sb n(N\sb D) \approx$ 2 at 300 K are reproduced and a value of 3 $< \mu\sb n(N\sb A)/\mu\sb n(N\sb D) <$ 4 is predicted at 77K. Low-field mobilities are then calculated for both strained and unstrained Si$\sb{1-x}$Ge$\sb x$ over wide ranges of doping, Ge mole fraction, and electric field, at 300K and 77K. A significant improvement in mobility (up to 50%) is observed for transport perpendicular to the growth plane in strained Si$\sb{1-x}$Ge$\sb x$, especially at 77K. High field MC simulations show that some strained mobility enhancement remains even at an electric field of 100 kV/cm. The improved model is then used in both DDE and Monte Carlo simulations at 300K and 77K of two strained-layer n-p-n Si$\sb{1-x}$Ge$\sb x$ HBTs with basewidths of 1000 A and 650 A and maximum Ge contents of 15% and 10% respectively. We find that as a result of improved mobility in the base and collector and velocity overshoot in the high field region, $h\sb{fe}$ and $f\sb T$ are improved significantly for the strained 650 A basewidth HBT as compared to a similar unstrained structure, especially at 77K.

Resolving Misalignment Limitations of Wireless and Batteryless Brain Implants

Patil, Mihir Nitin January 2021 (has links)
No description available.

Direct Evaluation of Hyper-singularity in Integral Equation with Adaptive Mesh Refinement

Peng, Shaoxin 02 October 2019 (has links)
No description available.

Differential forms applied to electromagnetism

Murphy, Raymond Cunningham January 1975 (has links)
No description available.

Electromagnetic Time-Reversal Imaging and Tracking Techniques for Inverse Scattering and Wireless Communications

Fouda, Ahmed Elsayed 08 August 2013 (has links)
No description available.

Singularity-Free Boundary Methods for Electrostatics and Wave Scattering

Alkhateeb, Osama 07 May 2012 (has links)
No description available.

Tightly Coupled Dipole Array with Integrated Phase Shifters for Millimeter-Wave Connectivity

Abumunshar, Anas Jawad 27 June 2017 (has links)
No description available.

Computer-aided electromagnetic analysis of chokes and transformers

Bau-Hsing, Ann January 1986 (has links)
No description available.

Robust Algorithms for Electromagnetic Field Computation with Conduction Currents and Kinetic Charge-Transport Models

Moon, Haksu January 2015 (has links)
No description available.

Utilization of photoconductivity in electromagnetics /

Bulman, Warren Eugene January 1958 (has links)
No description available.

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