一种超声波换能器驱动器，所述驱动器具有大磁致伸缩元件、用于在机械压力下保持大磁致伸缩元件的紧固件、用于提供偏磁场的第一磁场产生器、用于提供磁性驱动场的第二磁场产生器、以及用于在磁致伸缩元件中引导磁场通道的磁性回路。用于接合装置的超声波换能器具有：在较小端处具有接合工具的角状部以及邻接至其上的安装桶状部。所述驱动器连接到角状部的较大端。
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A method for the exchange of information between heterogeneous environments adaptive procedure call method comprising the steps of: a database of product model data into the object model, and further converted to extensible markup language file; using the Extensible Stylesheet Language, will be exte.....
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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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The utility model relates to an electronic device for helping blind walking and discriminating obstacles, which is worn on a head of a user. The utility model comprises an ultrasonic emission sensor, two ultrasonic receiving sensors, a control circuit which can generate ultrasonic signals, receive u.....
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The degradation of contaminant, PAHs is very ineffective and slow. Beside, during soil composting process, the toxicity of PAHs significantly increased with its increased molecular weight. More difficulty, the biodegradation of molecules containing five or more benzene rings of PAHs molecules is ver.....
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