Derivatives of novel carbon bridged cyclopentadienyl-dicarbollide complexes of titanium, zirconium and hafnium display a very high activity as ethylene polymerization catalysts in the absence of a cocatalyst. This invention relates to novel group 4 metallocene catalysts bearing linked cyclopentadien.....
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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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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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High-resolution peripheral quantitative computed tomography (HR-pQCT) is a non-invasive bone imaging technology that generates high-resolution 3-D images for quantitatively analysis of the bone micro-architecture. To enable quantitative evaluation of bone changes, accurate alignment between the bas.....
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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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