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This thesis has discussed the theory of measuring distance in ultrasonic, which include ultrasonic shaking transmit velocity, central frequency, angle of launch control, measure distance, dynamic measure and so on. According to character of wave shape output by circuit, this thesis has designed an efficient way to diminish noise that enables precision of the ultrasonic sensor to 0.2%.

论文详细论述了超声波测距的基本理论，包括超声波震动传播速度、中心频率、发射角控制、发射能量、检测距离、动态检测等；并根据电路输出波形特征设计了有效的降噪方法，使超声波传感器的精度达到了0.2%，然后对降噪后的信号进行了标定。

This enables you to centrally define and manage the types of content you store in your site collection.

这使您能够集中定义和管理等方面的内容您在网站集商店。

Firstly, oscilloscope control system based on GPIB technique is presented with friendly operation environment to the HIFU system, and it uses multithreading technique in programming to realize real-time recording and display of the signal; Secondly, temperature collection and data recording system is designed, which also could get real-time recording and display of the 16 channel temperature signal, and it's believed to be of great use for further experiments of the HIFU system; Thirdly, multiple ultrasonic phased array's phase shifter is designed,which could provide 8-bit phase control in a range of frequency where the centrical frequency is 1MHZ. Fourthly, the module of serial communication is realized to insure the communication between devices and computer, including both synchronous and asynchronous communication, which enables the system to transfer data reliably and stably; Finally, the module of digital quantity control is accomplished, which provide for upper application the consistent solution to the control of exterior devices via digital interface. It can get or set the devices state using interrupt mode to receive input signal or send output signal.

主要有以下几个方面：设计了基于GPIB的示波器控制系统，给课题的研究工作提供了一个良好的环境，它采用了多线程编程的方法，能够较好的实时显示当前波形并记录数据；设计了温度采集和数据记录系统，能够对16路温度信号进行并行同步的实时采集，用于HIFU剂量学研究中温度场检测和医疗评价；设计了相控阵相位延时电路并且通过调试，满足了课题的相位控制的要求，在中心频率为1MHZ左右的频率范围内都能够达到8-bit相位控制；实现了串口通讯模块，为各项设备与计算机之间的通讯提供保证，它提供同步和异步的通讯能力，使系统能够可靠稳定的传输数据；建立了数字量控制模块，为上层应用程序提供一致的方法使用数字接口控制外部仪器，它使用中断的方式来接收输入或输出设定的开关量信号，从而得到或设定各种仪器的状态。

This article mainly carries on reconsidering to the uniform circular motion teaching experience,proposed the uniform circular motion teaching first step is enables the student to grasp the uniform circular motion accurately the basic concept,and proposes the solution centripetal acceleration and the centripetal force concept teaching method specifically.

湖北省 鄂州 2 。湖北武汉摘要：本文主要对匀速圆周运动的教学经验进行反思，提出匀速圆周运动的教学的第一步是让学生准确掌握匀速圆周运动的基本概念，并具体提出解决向心加速度和向心力概念的教学的方法。

After the separation of urine and faeces, the south toward cesspit enables the acceleration the dehydration of faeces.

尿粪分离后，加上粪坑朝南配置粪便容易乾燥，缩短无害化堆肥时间，尿液静置几天就可稀释使用。

An object of the present invention is to provide a technology that enables to determine the cetane number of fuel in a state in which it is actually used for running an internal combustion engine with an improved degree of accuracy.

本发明的目的是提供一种技术，以便能够在实际运行内燃机的状态下更准确地确定燃料的十六烷值。

Knowledge enables the mental and material champaign to become fertile earth,and every year its products increase by ten times,in this way,it brings us wealth.

知识会使精神和物质的瘠薄的原野变成肥沃的土地，每年它的产品将以十倍的增长率，给我们带来财富。

Knowledge enables the mental and material champaign to become fertile earth and every year its products increase by ten times in this way it brings us wealth.

知识会使精神和物质的硗薄的原野变成肥沃的土地，每年它的产品将以十倍的增长率，给我们带来财富。

Teen online dating also enables you to chance upon people whom you may never have met otherwise.

青少年网上约会也可以让您有机会的人后，您可能从未满足，否则。

It's another kind of spirit, enables me to chant quietly

那是另一种精神，让我可以静静地吟唱

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。