Now showing items 21-30 of 19385
Analysis and Design of a DCM SEPIC PFC with Adjustable Output Voltage
(Virginia Tech, 2015-03-31)
Power Factor Correction rectifiers are widely adopted as the first stage in most grid-tied power conversion systems. Among all PFC converts for single phase system, Boost PFC is the most popular one due to simplicity of ...
The development and application of the load-stroke hysteresis technique for evaluating fatigue damage development in composite materials
(Virginia Tech, 1994-05-14)
A new experimental method was developed to measure the hysteresis loss during a fatigue test from the load and stroke signals of a standard servo-hydraulic materials testing system. The method was used to characterize ...
Litter Decomposition in Created and Adjacent Forested Wetlands of the Coastal Plain of Virginia
(Virginia Tech, 2002-05-30)
Litter decomposition is a poorly understood function of constructed and natural forested wetlands. This study compared rates of litter mass loss, changes in litter morphology, and associated macroinvertebrate populations ...
Reduced order power system models for transient stability studies
(Virginia Tech, 1993-12-05)
<p>As the load on the power system grows and new transmission facilities become increasingly difficult to build, the utilities must look to ways to make the most of the current transmission system. Adaptive relaying is one ...
Device driver development and implementation for work cell control
(Virginia Tech, 1988-12-05)
<p>Industry's move towards automated manufacturing has been rapid during this decade. In a typical flexible manufacturing environment, a variety of automated manufacturing equipment is linked together with a communication ...
Sapphire optical fiber sensors
(Virginia Tech, 1991-05-05)
<p>Fiber optic sensors offer many advantages over conventional sensors, including; small size, low weight, high strength and durability. Standard silica optical fibers are limited by the material properties of silica. ...
Numerical simulation of an optimal channel cross-section
(Virginia Tech, 1991)
The failure of early Bermuda, 1612-1630
(Virginia Tech, 1989-04-05)
<p>Bermuda, settled in l6l2, was the second successful English colony founded in the New World. The islands appeared to provide investors in England with an excellent opportunity to make a profit, but the colony failed ...