一种用于三轴试验的自动和连续地测定土样受压时体积改变的装置，包括一个具有柔韧橡胶膜壁的容器１３，土样１０装在所述容器内。在样品上加上一个载荷排出样品中空气和水分。在样品受压过程中，通过将水泵进或泵出内腔１９０来测量受压样品的体积改变量。
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An ultraviolet detector, comprising the structure: one sapphire substrate layer; a high temperature AlN buffer layer grown on the sapphire substrate layer, the high temperature AlN buffer layer is 740 ℃ ~ 820 ℃ temperature obtained under; one temperature GaN buffer layer grown on the high temperatur.....
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The invention provides a zoom lens system, which comprises a zooming unit, a compensating unit and an imaging unit arranged on a same optical axis in turn, a driving transmission mechanism and a micro-processing control unit, wherein the driving transmission mechanism comprises a zooming stepping mo.....
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The invention relates to a mechanical zoom lens device which comprises a first cylinder (103) provided with a zoom curve groove (117) and a compensating curve groove (116), a second cylinder (104) provided with a straight line groove (115), a first circular ring (105) provided with a first keyhole (.....
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Solar-blind UV detectors with a long wavelength cutoff below 280nm have a board range of applications, from fire detection, flame combustion control, scientific instrumentation and missile detection, to UV astronomy. Traditionally, photomultiplier tubes (PMT) and gas-ionization chambers have been us.....
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