低压的

The first one mainly introduced engineering calculate method of load and selected the all electric implements. They are in charge of the motor four rotation states, and the sensor is in charge of testing the position of helicopter airscrew and display by computer. The second one designed the controller of the motor based on low-voltage electric implement and analyzed the all system.

第一部分，主要介绍了负载参数的工程计算，选取整个系统的电气元件，电气元件部分主要负责双速电机的正向、反向和高、低速旋转状态，测速传感器用于完成对桨距位置的检测和最终的显示任务；第二部分，设计了基于低压电器的总桨距调节控制器，并对整个系统进行详细的分析。

Companies rely on advanced quality management system, strong technology development strength - in constant demand by customers for the purpose of focus, the commitment to the development of China's vacuum valve creatively continuously reliable performance, beautiful appearance of the products, have in hand , gas, electric butterfly valve, valve, damper valve, electromagnetic valve differential pressure, electromagnetic valve, ball valve, valve plates, etc. more than 10 series vacuum valves, as well as various specifications and models of high school low-pressure valve and hydraulic control valves.

公司依靠先进的质量管理体系，雄厚的技术开发力量—在不断地以顾客需求为关注焦点的宗旨下，致力于我国真空阀门的发展，创造性地不断推出性能可靠，外形美观的产品，有手，气、电动的蝶阀、隔膜阀、挡板阀、电磁压差阀、电磁截止阀、球阀、插板阀等10多个系列真空阀门，以及各种规格和型号的高中低压阀门和水力控制阀门。

Considering nodal pressure as the evaluating indicator, functional reliability indexes of the nodes were calculated by the mean-first-order-second-moment method which was originally developed for structural reliability analysis.

在进行供水管网的抗震功能可靠度分析时，借鉴结构可靠度的分析方法，以节点水压为评价指标，采用均值一次二阶矩方法计算管网各节点的功能可靠度，该方法通过一次水力分析即可给出震后低压供水和渗漏状态下管网各节点的可靠性指标，较之前发展的随机模拟方法大为简化且概念清晰。

Considering nodal pressure as the evaluating indicator, functional reliability indexes of the nodes were calculated by the mean-first-order-second-moment method which was originally developed for structural reliability analysis.

在进行供水管网的抗震功能可靠度分析时，借鉴结构可靠度的分析方法，以节点水压为评价指标，采用均值一活动板房次二阶矩方法计算管网各节点的功能可靠度，该方法通过一次水力分析即可给出震后低压供水和渗漏状态下管网各节点的可靠性指标，较之前发展的随机模拟方法大为简化且概念清晰。

The mainly learnning is low-voltage apparatus、three phase asynchronous motor and electric control wiring of DC Motors、Principle and control of stepper motor and control wiring of typical electric machine、basic theory and basic methods of machine equipment electric control、 basic control circuit of electric control system、analysis of typical electric machine control System、basic principles and methods used of PLC、design and debug of machine tool control system、 design of electrical control gear etc.

主要学习常用低压电器、三相异步电动机和直流电动机的电气控制线路、步进电动机工作原理及控制以及典型机床电气控制线路、机床设备电气控制的基本理论和基本方法、电气控制系统的基本控制电路、典型机床电气控制系统分析、可编程序控制器的基本原理及使用方法、机床控制系统的设计和调试、电气控制装置设计等内容。

On the request of molding technics of aluminium alloy wheel, this paper studies the intelligence control system for low pressure die casting, through which the real pressure in the oven can track the given values on the technical curve quickly and accurately .

随着工业技术的发展，对低压铸造质量的要求越来越高。目前国内使用的铸造机基本上可以分为二类：一类是国外进口的铸造机，如德国的金马机，另外一类是国产机。

The calculation and experiment results show that the maximum lifting pressure performance decreases with the increase in throat diameter of channel of variable section, water flux of low pressure and pressure ratio of steam nozzle, and has its minimum value with water nozzle annular space. The coefficient of maximum lifting pressure performance may be as high as 26. In the design of steam injector, the larger pressure ratio of steam nozzle and the smaller water nozzle annular space are selected, the higher lifting pressure performance could be obtained.

计算及研究表明：极限升压能力随变截面混合腔喉部直径、被升压的低压水流量和蒸汽喷嘴压比增加而降低，随环形水喷嘴间隙的变化出现了最小值；计算得出变截面超音速汽液两相流装置的极限升压能力可达26；在设计升压装置时应尽可能选取较大的蒸汽喷嘴压比和较小的环形水喷嘴间隙。

Results show that the performance of this VCRT basically reaches the original objective,which indicates that a convergent-divergent blade passage in the high pressure rotor and a convergent-divergent meridian plane of the VCRT are suitable for the VCRT.

结果表明，对转涡轮各方面性能基本达到了设计目标，说明高压动叶采用收扩型叶栅通道且整个涡轮子午流道也采用收扩结构的设计可以获得满意性能；三排叶片仍有改进余地，即涡轮效率还有进一步提升的潜力；高压动叶出口沿整个叶高均为超声速，出口马赫数节距平均值在1.4~1.6之间；高压动叶尾缘斜激波强度以中展为中心向两侧递减；涡轮性能随出口背压的增加而下降；涡轮出口背压的变化对高压转子性能基本没有影响，但对低压转子性能的影响较大。

Finally, aluminium alloy foam specimen with different structural parameters were made to investigate the variation of underwater sound absorption coefficient.

最后，本文利用前面得到的低压渗流法的较佳的工艺参数，制备了不同结构参数的泡沫铝样品，并研究了样品的水下声吸收系数的变化规律。

The Christmas 1994 nor'easter was an intense cyclone along the East Coast of the United States and Atlantic Canada. It developed from an area of low pressure in the southeast Gulf of Mexico near the Florida Keys, and moved across the state of Florida. As it entered the warm waters of the Gulf Stream in the Atlantic Ocean, it began to rapidly intensify, exhibiting traits of a tropical system, including the formation of an eye.

1994年圣诞东北风暴是一场席卷美国东海岸和加拿大大西洋省份的强烈气旋，它发源于近佛罗里达群岛的墨西哥湾东南部的一个低压区，然后横穿整个佛罗里达州，当它一进入大西洋遇到墨西哥暖流的温和水域便迅速增强，显示出热带气旋的特征，包括形成了一个风眼。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。