Now showing items 31-40 of 1054
Modified Space Vector Modulation for a Zero-Voltage Transition Three-Phase to DC Bi-directional Converter
(Virginia Tech, 1995-04-01)
A modified space vector modulation algorithm for a zero-voltage transition three-phase voltage source inverter/boost rectifier is presented. The converter is intended for high performance medium power applications requiring ...
Analysis of Thermally Diffused Single Mode Optical Fiber Couplers
(Virginia Tech, 1994-12-22)
The phenomenon of dopant diffusion as a viable means of coupler fabrication is investigated. It is well known that the diffusion of dopants can improve the uniformity of multimode star couplers manufactured by the fused ...
Evaluation of TDOA Techniques for Position Location in CDMA Systems
(Virginia Tech, 1997-08-06)
The Federal Communications Commission (FCC) has adopted regulations requiring wireless communication service providers to provide position location (PL) information for a user requesting E-911 service. The Time Difference ...
Development of Web-Based Educational Modules for Testing VHDL Models of Digital Systems
(Virginia Tech, 1997-08-06)
The exponential growth of the World Wide Web (WWW) on the Internet and accompanying WWW browsers has promoted opportunities for new methods of teaching and learning. Teaching does not simply involve presenting textual ...
A Comprehensive In-Building and Microcellular Wireless Communication System Design Tool
(Virginia Tech, 1997-06-09)
Indoor wireless communication systems are becoming increasingly prevalent in work environments. The need to quickly and efficiently provide in-building and microcellular coverage without sacrificing quality is critical ...
Corrosion detection using metal coatings on fiber optic sensors
(Virginia Polytechnic Institute and State University, 1995)
Fiber optic sensors have been utilized as corrosion sensors by depositing metal coatings to the surface of the sensors. Three types of fiber optic sensors were investigated as candidates for corrosion detection: the extrinsic ...
Recognition of logic blocks in CMOS circuits
(Virginia Polytechnic Institute and State University, 1988)
A Prolog based approach towards the recognition of logic functional blocks in CMOS circuits is described in this thesis. A transistor level description of the circuit is assumed to be available. Predefined gates and logic ...
Propagation modeling for land mobile satellite communications
(Virginia Polytechnic Institute and State University, 1985)
Satellite systems are being planned for two-way communication with mobile vehicles using UHF and L-band frequencies. Of special concern in the system design are the characteristics of propagation in suburban and rural areas ...
The radiation field produced by longitudinal slots in a long circular cylinder
(Virginia Polytechnic Institute, 1963)
no abstract provided by author
Automatic Detection of Elongated Objects in X-Ray Images of Luggage
(Virginia Tech, 1997-09-05)
This thesis presents a part of the research work at Virginia Tech on developing a prototype automatic luggage scanner for explosive detection, and it deals with the automatic detection of elongated objects (detonators) in ...