During the turn-on and turn-off switching processes, power converters have to withstand high voltage and current, leading to high switching losses and stresses. The invention is a passive lossless snubber cell with minimum stress and wide soft-switching range. The energy reset / recirculation proces.....
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Equipment health monitoring is essential for preventing failures that may cause human injuries or equipment damage. It can also enhance productivity, product quality and the lifetime of machinery. However, existing diagnostic tools cannot detect randomly occurring faults, and are too complex and exp.....
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The invention relates to an improved method for storing hydrogen in single-walled carbon nanotubes. Carbon nanotubes are dipped in hydrogen gas for absorption. The size of carbon nanotubes to be used depends on the density of hydrogen molecules, and generally, nanotubes of diameters from 0.5 to 1.2 .....
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For years, mouse models have been used for testing new drugs, despite their high cost. More recently, the zebrafish has been identified by the National Institutes of Health (NIH) in the US as an important vertebrate model for studying the development of embryos and human diseases. When compared wi.....
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Existing methods for multi-string applications require many windings in the isolation transformers because each converter output needs one winding. This invention, a dimmable LED driver, can reduce the number of windings. It also possesses a two-secondary-winding structure to generate several source.....
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