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2004年9月21日,ISO 9001审核实践工作组(ISO 9001 APG)发布了最新文件修订状态纪录(Document revision stares record)。与中国新时代质量体系认证中心研究发展部翻译,《中国质量认证》杂志2004年8期发表的(ISO 9001审核实践工作组对ISO 9001:2000标准部分要求审核的指南性意见》相比,发生了以下变化。 相似文献
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在姿轨控发动机地面试验中,需要控制快响应电磁阀的开闭,同时准确地测量负载电流。针对应用中的问题,实现了一种高速固态继电器接口电路。设计了用于各路控制信号隔离、逻辑判断和放大的数字控制电路,可切换共正/共负的负载模式,抑制感性负载反电势的负载电路,以及具有隔离输出的电流检测电路。误差分析和测试校准证明本电路对控制信号传输延时不超过150ns,电流检测精度达到0.2074%,可广泛适用于各种控制器与固态继电器的接口以及电流检测应用中。 相似文献
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Seismic signal is generally employed in moving target monitoring due to its robust characteristic. A recognition method for vehicle and personnel with seismic signal sensing system was proposed based on improved neural network. For analyzing the seismic signal of the moving objects, the seismic signal of person and vehicle was acquisitioned from the seismic sensor, and then feature vectors were extracted with combined methods after filter processing. Finally, these features were put into the improved BP neural network designed for effective signal classification. Compared with previous ways, it is demonstrated that the proposed system presents higher recognition accuracy and validity based on the experimental results. It also shows the effectiveness of the improved BP neural network. 相似文献
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