和电路

The structural of mechanism adopted double pipes feed-in with mixing machine, special weighbridge for reducing bond; The hardware circuit make use of the programmable amplifier AD8555 which amplify the weak sensor signal and bridge imbalance compensation and gain error, at the same time,32-bit microprocessor LPC2134 was used as the core of the hardware to deal with the messages and send order to the implement machine. Software design transmits materiel by stages and FIR filter was adopted to remove big errors and enhance precision.

机械结构使用双管螺旋喂料机加搅拌机构，特殊的称斗结构；硬件电路采用数字可编程放大器AD8555作为称重传感器微弱电信号的放大器，以便于补偿桥式传感器的失调和增益误差，同时采用32位单片微处理器LPC2134作为整个电路的处理核心，及时处理称重信息，并向执行机构发送命令；软件根据称重值采取分阶段喂料，并加入了FIR软件滤波，滤除了粗大误差信号，提高了称重精度。

In PC and wiring diagram construction, refers to electrical connections between pins, components, contacts, or circuits.

在印刷电路和布线图结构中，指的是引线端、元件、通孔或电路间的连接。

Adherence, repairing property, anisotropically electra conductivity and rapid adhering at low temperature are given to FPC by anisotropically electro conductive hot melt adhesives who are key component of FPC. There is no report on successfully manufacturing AECHMA in our country at present, so it is very significant to make a research on AECHMA.

异向导电热熔胶是柔性印刷电路的关键组分，它赋予柔性印刷电路粘接性、可修复性、异向导电性和低温快速粘合性，国内尚无成功开发异向导电热熔胶的报道，因而对异向导电胶进行研究开发具有非常重要的意义。

The discussion covers: 1、By theoretical analysis on the measurement circuit of the piezoelectric accelerometer, a optimization design for charge amplifier is proposed which uses TL081 to replace a largenumber of discrete components. The design not only improve the integration of the circuit, but also have some extra merits, including smaller volume, lower consumption, less autoeciousness and stronger resistance to interruption. 2、Affiliated conditional circuit and filter to the devised charge amplifier, the signal is normalized and the noise ( generally, high frequency signal and DC signal) are restrained.

论文完成的主要工作如下： 1、通过对压电加速度传感器测量电路的理论研究，提出用TL081芯片取代大量的分离元件进行电荷放大器的优化设计方案，从而提高了电路的集成度，使其具有体积小、功耗低、寄生因素少和抗干扰性能强的优点。

At system level design, we select the feed-forward form to be benefic for stability and linearity design.

在电路设计方面，大的负载电容、高的时钟频率和高的线性度要求是电路设计的难点。

With PWM control chip L4981A, the bridgeless AC/DC topologic circuit is constructed. Its principal is analyzed and simulated with PSpice, its design process is introduced,and the experimental result is shown.

通过高功率因数PWM控制芯片L4981A，构建桥式AC/DC拓扑电路，分析了其工作原理并进行了系统仿真，叙述了拓扑电路的设计和参数选取过程，最后给出了样机实验结果。

Based on bridgeless PFC topology,a 1 500 W prototype has been designed.The control chips use L4981 and IR1150 based on average current control and one-cycle control technology.

实验基于无桥Boost PFC拓扑，控制电路分别采用&平均电流控制&技术的芯片L4981和&单周期控制&技术的芯片IR1150，研制出一台1500W的实验样机，并对两种控制电路进行了详细的对比分析。

This article mainly elaborated the current cut negative feedback cocurrent velocity modulation system main circuit and the triggering electric circuit design.

本文主要论述了电流截止负反馈直流调速系统主电路和触发电路的设计。

Its application to SPC circuits gives the same results as those obtained by the state-space average approach, which is proposed by Middlebrook and Colk, but our approach is also in the form of CMNA.

在分析方面，通过应用加权平均和小信号近似手段，我们建立了KL平均法，导出了开关变换器电路的S域分析的紧凑型改进节点方程，为人们应用拉普拉斯变换这一得心应手的工具来研究这类周期性开关电路提供了又一种方法。

The antenna system includes a mechanism for electrically connecting the displaceable antenna to internal RF circuitry of the portable WCD when the displaceable antenna is in an extended position and for electrically isolating the displaceable antenna from the internal RF circuit when the displaceable antenna is in a retracted position within the casing.

该天线系统包括一个机构，用来在可移动天线处于拉伸位置时把可移动天线电连接至便携式WCD的内部RF电路，并在可移动天线处于外壳内的收缩位置时把可移动天线和便携式WCD的内部RF电路电隔离。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。