It had been a very long dream in polymer science to synthesize long multi-block heteropolymer chains with an ordered sequence and controllable block lengths. Using ionic or living free radical polymerization, one can prepare copolymers with few blocks, such as diblock and triblock copolymers. The .....
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Salinity and drought stresses posed a severe problem to agriculture worldwide. Both stresses will induce oxidative stress and cause damage to plant cells, resulting in retarded plant growth and consequently a reduction in crop yield. We identified a novel purple acid phosphatase (PAP) gene from so.....
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A family of new mechanical presses is invented. This type of presess is programmable (including its stroke, speed and acceleration) and energy-efficient (it uses a flywheel to ease the peak energy). Mechanically, it is a 2 degree-of-freedom punching mechanism driven by two different motors (a commo.....
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The invention makes the generation of a low frequency error clock source for backscatter link frequency possible. The power consumption of the invention is very low such that the reading distance of a passive transponder is not harmed. Also the clock calibration process continuously conducted in t.....
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A computer-based method and system for establishing topic words to represent a document, the topic words being suitable for use in document retrieval. The method includes determining document keywords from the document; classifying each of the document keywords into one of a plurality of preestabli.....
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