步进的

Especially, the technology of Automatic Gain Control and signal processing are studied which are key factors working on the performance of the receiver. Based on analyzing the theory of automatic Gain Control, operational amplifiers 0P37 and logarithmic D/Aconverter AD7111A are used to design variable gain amplifiers which can be controlled numerally, A/D convector LTC1405 is Used to test the echo, Complex Programmable Logic device is used for controller, and an arithmetic is designed for automatic Gain Control which is simulated and analyzed in order to test its feasibility.

本文在分析自动增益控制AGC原理的基础上，采用集成运放OP37和数控增益衰减器AD7111A设计可数字控制的可变增益运放模块；采用高速A／D转换器LTC1405作为回波信号检测模块；采用复杂可编程逻辑器件CPLD作为核心控制模块，构成数字自动增益控制电路，并设计粗调和细调步进控制相结合的算法，对回波信号的增益进行精确而快速的调节控制，使回波信号振幅快速稳定在设计指标范围内，利于接收机后续信号处理电路对回波信号作进一步的处理。

Based on above process, three parts of cricoid winding machine's structure is defined as that: winding installation, clamping installation and the part of chest. The clamping installation clamp loop and let it turn. Install the wheel which fit the strap and a impulse electric in the the part of chest.

基于前面所提到的工艺动作和路线又作了进一步的确定，也就是说该环型缠绕机结构又可分为绕线装置、夹紧芯模并且带其转动的夹紧装置和安装带轮以及步进电机的箱体三大部分。

This system uses a MCU as a core , a keyboard and infrared detecter as the input system ,a LED display circuit, a warning circuit and a stepper motor as the output system to realize the auto controlling of the liquid drop speed .

本次设计的系统，是以8031单片机为核心以键盘及红外传感器为输入系统，以数码管、报警电路及步进电机为输出系统的智能化的液体点滴速度的控制及监测系统。

The doctor blade gap is set with an accuracy of 0.02 mm by two precision ball-screw stepper-motors,one on each side of the doctor blade.

刀片间的距离的精确度达0.02毫米，这是由位于刀片两端的两个精制球状螺钮步进电机来确定的。

Some useful results can be obtained. For example, the specified phase relationship can be acquired by tuning the free-running frequency of peripheral portions of array.

利用这个理论可以得到一些有用的结论，比如，在一定条件下，只需调节外围单元的自由振荡频率就可以得到阵列的恒定的步进相位。

The hardware included helicon wave antenna and focusing system.

其中硬件系统主要包括：螺旋波天线和辉光聚焦系统的设计；PCL-818HG数据采集卡输出的+5V稳定信号，经过分压电阻和三极管后，作为数控器的外部启动/停止信号，控制步进电机带动光谱仪转动；另外，为了减小光电倍增管的噪声，单独为其提供了稳定的高压直流电源。

Therefore, high-stepping will work to create the best cost-effective products, providing quality and satisfactory after-sales service, with the vast number of customers to work together, step-by-step to expand the domestic network security market share of physical isolation.

因此，步进高公司将努力创造最好的性价比产品，提供优质而完善的售后服务，与广大的客户携手合作，逐步的扩大国内网络安全物理隔离市场的份额。

In order to measure the passive network's conduction automatically, a network conduction instrumentation based on FPGA technology was designed and implemented according to the design principle of Virtual Instrument. System adopted FPGA technology building a digital flat-top to imitatively produce the high quality sine signal. Under the control of C8051MCU, measurement, calculation and display of the port network's conduction were automatic implementation. Furthermore, the system has the function of frequency step measurement.

摘 要：为了实现对无源端口网络的导纳进行自动测量，根据虚拟仪器设计思想，设计实现了基于FPGA的网络导纳测量仪，系统以FPGA作为数字平台模拟产生优质的正弦信号，在单片机C8051的控制和处理下，自动实现端口网络导纳值的测量、计算、显示，同时具有频率步进测量功能。

Based on matrix analysis of motor and general theory of alternating current machines,3-phases induction synchronous motor is substituted for symmetrical 2-phases motor with even gas,then the equation for instantaneous torque of induction synchronous motor step motion is obtained.

文中采用了电机的矩阵分析方法，根据交流电机统一理论，将三相感应式同步电机用等效的具有均匀气隙的两相电机来代替，得出了感应式同步电机步进运动的瞬时转矩表达式。

In fact, we can allow patterns of the form , where is an integral vector, so that the direction of the step is determined by forming an integral combination of the columns of B. The special cases

事实上，我们可用的模式，这里是一个整数向量，因此步进方向由组成B的列的整数组合决定。Céa和Polak研究的特殊情况可简单地选择B为I和而得到。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。