The present invention relates to a shape memory fiber and its preparation method, the shape memory fibers are made from a shape memory polyurethane, said polyurethane formed by the reversible phase component (A) to form a fixed phase component (B) prepared by . The shape memory fiber preparation met.....
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An ultrasonic transducer driver has a giant magnetostrictive element, a fastener for holding the giant magnetostrictive element under mechanical pressure, a first field generator for providing a magnetic bias field, a second field generator for providing a magnetic drive field and a magnetic circuit.....
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The present invention relates to a preparation of shape memory polyurethane shape memory fiber and its preparation method, the shape memory polyurethane is a hydroxyl group-containing organic polymer material, a chain extender, a diisocyanate, blocking agent, the molar ratio of 1: 1-3:2.4-4.8:0.8-1......
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The invention discloses a 2D dynamic calibrating table, for calibrating a GPS system arranged on a construction, comprising: a bearing frame, a moving platform, a double-layer two-way movement mechanism arranged between the bearing frame and moving platform to drive the moving platform to make 2D mo.....
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一种检测调校光电控制器的可变照明装置包括：在箱体光室中一端的光度可调的白炽灯泡。在光室中靠近灯泡的、使灯泡发出的光多次反射的光障。在光室中另一端的让该多次反射后的光线射出光学室的透明窗口。在光室中窗口附近的具有窗口相同光度的测光表。在光室外的围绕该窗口的遮光圈。与测光表连接的在箱体电器室中可由外部读数的显示器。在电器室中向灯泡供电的电池组。在电器室中可由外部调节的控制该电池组供电电流大小的变流器。在电器室中的可由外部调节测光表的调节器。本实用新型装置结构简单，造价低廉，体积小巧，可用于不同尺寸的光电控制器感光窗，使得街灯用的光电控制器在任何强度的环境光下都能检测调校。
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