We are enclosing our sales confirmation no . … ， in duplicate , one copy of which ， completed with your signa - ture ， is to be returned to us 附寄销售确认书第…号一式两份，望查收。请会签一份并退副本退还我方。
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3 . an elementary attempt has been made to enhance the signa - to - noise ratio of pqc sensors using cholestyramine particles embedded in the sensing film . bor more , an all - purpose sulpha - drugs pqc sensor was developed whch can be used for screening practice 对如何提高基于离子对缔合物的压电药物传感器的信噪比进行了初步探索，发现在传感膜层嵌入考来烯胺树脂颗粒对磺胺药物压电传感器的信号有明显的扩增作用。
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By utilizing the knowledge of digital circuit and simulation circuit , the system designs the pretreatment dealing circuit of the myoelectrical signal , which has the feature of big input impedance well suppress of public module and high gains . then the signal is gathered with " zhentong " data gathering after dealing with , and the software of signal processing is explored before the myoelectric signal is analyzed . after picking up eigenvalue , it is proved that the result is unanimous basically with the data of the relevant materials ; the other is to control artificial hand by the eigenvalue of the myoelectric signa l and at last the system gets very good control results 即利用数字电路和模拟电路等相关知识，设计了具有输入阻抗大、共模抑制好、增益高等特点的肌电信号前置处理电路，利用“振通”数据采集仪对处理后的信号进行采集，并利用快速傅立叶变换的相关知识编写了信号处理程序，对肌电信号进行了波形分析、幅值谱分析和功率谱分析，提取了信号特征值，与相关资料的数据相比，基本一致；二是利用肌电信号的特征值对肌电假手进行控制。
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The emphasis of this article is the design in the second period , which is based on the pic microchip interface , because at present embedded structure is adopted by most of medical instruments so that it can run separately without computer , hi this part the article specifically introduces the interface circuit of pic16f877 single - chip , which includes the acquisition of a / d signa ls and the serial communication between the single - chip and computer , the design of complex programmable logic device ( cpld ) and the using of hardware describe language ( vhdl ) to control the rotate speed of 4 - route stepping motors 本论文的重点是在设备的第二阶段开发，它是基于pic系列单片机接口的硬件设计，主要是针对现阶段大多数医疗设备都是采用嵌入式结构，它能够脱离计算机单独运行。在这部分详细介绍了pic16f877单片机的外围电路，包括a d信号的采集、单片机与计算机的串行通信，可编程逻辑器件cpld硬件的设计，以及用硬件描述语言vhdl编程来同时实现4路步进电机的转速控制。
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On the other hand , atm is connection - oriented , the implementation of cac function for svc depends on atm signaling system . however , as a result of having no necessary functions of call and connection control , the protocol stacks for atm signa ling defined by itu - t can not realize the function of cac and can not be used directly in the atm equipment 另一方面， atm是面向连接的，交换型虚连接（ svc ）真正体现了atm技术的灵活性，与svc相应的cac功能则依赖于atm信令系统来完成，然而itu - t所定义的atmuni和nni信令协议栈由于缺乏必要的呼叫/连接控制功能，从而无法对cac进行支持且无法直接应用于各种atm设备中。
