低压的

Considering the complex environment of PLCC,this paper first establishes the channel model of low-voltage power line on the basis of the research of its impedance,attenuation,and noise characteristics.

针对低压电力线通信环境复杂的特点，本文在综述信道模型的基础上，根据对其阻抗特性、衰减特性及噪声特性的分析，提出并实现了利用实际网络结构、负载装置和电力线模拟电路，组成信道模拟系统的方法。

A new type of overcurrent protection ,phase-sensitive overcurrent protection based on sampled value of current,is suggested in this paper.

针对中低压电网中过流保护存在灵敏度低的缺点，提出了一种新型微机式过电流保护即基于电流采样值的相敏过电流保护，并分析了它的基本原理、具体的实现方法及可靠性问题。

Research and Design of Push-Pull Forward and Soft-Switching Circuit

本文结合推挽正激直流变换器和高频脉冲直流环节逆变器的优点，提出了一种适用于低压大电流输入场合的逆变器，并对构成这种逆变器的电路拓扑、SPWM控制策略、稳态原理特性进行了深入的分析研究。

Spectralmeasurements at different positions on the colored crystals weresystematically carried out, the measured spectra were seasonably decomposed,and spectral parameters of the color centers were accurately determined.

光谱分析表明，在这两种条件下所产生色心的浓度不同：在高温低压条件下，生成的F心浓度低，聚集心的浓度高；而低温高压条件下的结果刚好相反。

The Company's advanced technology and equipment, detection means complete, currently has a large IF Elbow push system machine, large R bender, metal links extrusion hydraulic press, stainless steel elbow hydraulic extrusion machine, 2000T hydraulic press table big job and 1000T, 500T, etc. Four-column hydraulic press and high-power resistance furnace heat treatment, shot blasting machine, such as noisy jet pipe production equipment, is equipped with a universal tensile testing machine, chemical analysis instruments, non-destructive testing equipment, spark photoelectric read the whole spectrum, such as test equipment and test equipment , the Company has a large number of pipe fittings for many years engaged in the manufacture of engineering and technical personnel and skilled workers, with process design, manufacturing, welding, heat treatment, chemical cleaning, and product inspection and testing of the ability to undertake a variety of bend of high, medium , low pressure and high temperature and low-temperature pipe fittings manufacturing business.

本公司工艺装备先进，检测手段齐全，目前拥有大型中频弯头推制机、大R弯管机、金属三通挤压液压机、不锈钢弯头挤压液压机、2000T大工作台面液压机及1000T、500T等四柱液压机和大功率热处理电阻炉、喷吵抛丸机械等管件生产专用设备，配备了万能材料拉力试验机、化学分析仪器、无损检测仪器、火花光电全读光谱仪器等检验和试验设备，本公司有一大批多年从事管件制造的工程技术人员和技术工人，具有工艺设计、制造、焊接、热处理、化学清洗及产品检验和试验的能力，能承接各种规格的弯头的高、中、低压及中高温和低温管件制造业务。

The sporophore of Cordyceps militaris and the cordycepin content of intermediate products were monitored in the whole course according to the relation between fixed and mobile phases of solvents in a combination system of binary and quaternary solvents, in which the applied methods were successively supercritical fluid extraction, alcohol sedimentation, low-pressure normal-phase silica-gel chromatography, reversed-phase high-performance liquid chromatography and fractional crystallization.

根据溶剂的固定相与流动相之间的相对关系，采用了二元和四元组合的溶剂系统，顺次采用超临界流体萃取法、醇沉法、低压正相硅胶色谱法、反相高效制备液相色谱法、分步结晶法和反相高效液相色谱法，子实体及其中间产物中的虫草素含量变化情况。

Large size parts generally refer to those parts with more than one meter long in each dimension, such as low-pressure cylinder of steam turbine, wing panel of plane and so on.

大型零件通常是指那些在各个维度的尺寸超过一米的零件，比如蒸汽轮机的低压缸体，飞机的机翼壁板以及一些专用零件。

A number of factors areconsidered including the pressure wave and the viscous resistance in the highpressure oil pipe and the changes of flow areas in the high pressure oil chan-nels.

讨论中考虑了高、低压油管内的压力波动和粘性阻力，以及高压油通道截面变化等因素的影响，同时，对系统中出现的"空腔"现象也作了适当的处理。

The Sacmi Group offers a comprehensive research and development service for the experimentation and composition of new mold resins."The sanitaryware industry is currently going through something of a transition period, with traditional low-pressure plaster mold casting steadily being replaced by high-pressure resin mold plants," said Vasco Mazzanti, technology and customer service manager of the company's Whiteware division.

由于目前的卫生洁具成型正处于一种由低压石膏模逐步向高压树脂模过渡的时期，Sacmi集团对新型树脂模的配方及实验进行了大量的研究与开发工作。

The effective means for increasing the efficiency of power plant is to connect the extraction feedwater system with drainage pump. But the running conditions of drainage pump is bad, because the working substance in drainage pump is generally low pressure heater drainage which is of features such as high back pressure and suction temperature.

采用疏水泵连接的给水回热系统是提高电厂效率的有效措施，但由于低压加热器疏水具有吸入压力和吸入温度比较高的特点，从而造成疏水泵的工作条件较差。

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。