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In this paper,the effects of environmental temperature and carrier frequency on working states of inverters is analyzed.

分析了环境温度、载波频率参数对变频器工作状态的影响，并对泵升电压的限制进行了探讨，结果表明：注重运行环境，设定正确的运行参数，将会取得比较满意的运行效果。

To improve the stability of Arcjet discharge plasma in low current and high voltage mode, research on the demand of output characteristics of Arcjet Power Conditioning Unit was conducted. In this paper, based on PWM invertors and current mode control, using MOSFET as the main power device, an Arcjet Power Conditioning Unit was developed. Through adding a closed loop feedback circuit of output voltage, it can make the output characteristics of PCU be positive resistance to ensure the stability of Arcjet discharge plasma. The experiment indicates that this PCU can make Arcjet engine work at high voltage mode (100 V, 10 A) and ensure the stability of arcjet discharge plasma. Finally, it provides the experimental data of Arcjet when working.

为了解决小电流、高电压下电弧火箭等离子体的稳定性问题，研究了电弧火箭发动机对电源调理单元的输出特性要求，基于逆变电源脉宽调制技术与峰值电流型控制原理，以MOSFET为主功率器件，研制了一台电弧火箭电源调理单元，给出了Arcjet工作时的实验数据，通过增加PCU输出电压的闭环反馈电路，可以使PCU的输出外特性呈现正阻性，保证电弧的稳定燃烧，实验结果表明，该电源调理单元能使电弧火箭发动机达到高电压工作模式(100V， 10A)，保持电弧工作的稳定性。

The structure,working principle and measure methods of some performances of the ESS-010-03 Electron Linac were introduced in this paper .

本文介绍了ESS-010-03型电子直线加速器的主要结构、工作原理，并详细介绍了加速器几种性能指标的测试方法。

Our company is specialized in industrial cleaning paper, cleaning cloth, oil-absorbing cotton and other product development, manufacturing, trading and selling of businesses, whose products are specially design for the development of is that the use of long-fiber pulp or pure non-woven cloth material, does not contain any chemical composition, not to hurt the object surface, lint-free dust, no static electricity, absorption and strong and does not dissolve in water and can be used in conjunction with the solvents and other liquids, consistent quality, inventories do not take up space to improve the working environment, improve work efficiency.

我公司是专业从事工业用擦拭纸、擦拭布、吸油棉等产品的开发、制造、贸易销售为一体的企业，其产品是经特别设计而研制成的，是采用长纤木浆或纯无纺布材料制成，不含任何化学成分，不伤物体表面，不掉毛屑，无静电产生，吸收力强，且不溶于水，并可配合溶剂等液体一起使用，品质稳定，库存不占空间，改善工作环境，提高工作效率。

For the purpose of researching the factors which affect the dynamic characteristic of mast of builder's hoist and analyzing the impact of different factors over system security, the authors of the paper applied the finite element method to build the model and made the modal analysis for mast which was installed with various installation distances or under different working conditions.

目的 探讨影响施工升降机导轨架结构动态特性的因素，分析不同因素对结构安全性的影响。方法采用有限元方法，建立了施工升降机导轨架等有限元模型，并对吊笼运行不同工况以及多种附着装置安装间距下的导轨架结构进行模态分析。

Based on the fact that the economy in the administrative area will be working for a long time and that we must make use of its positive effect, this paper puts forward the administrative division and non-administrative division mesas to solve the conflicts of regional cooperation in the Chang-Zhu-Tan area, and makes some suggestions so as to gain the best results.

本文在行政区经济还将长期存在的基本事实的基础上，从发挥其正面效应，削弱其负面效应着手，针对长株潭一体化中存在的主要问题，提出用行政区划手段和非行政区划手段来进行协调，并提出一系列解决问题措施和设想。

This paper,based on the study on the structure,working principle and safety factors of the timber-collected board-vehicle , made out four cases-using timber-enlaced machine,improving on brake-staff,adding iron fortified muscle and making brake oriented-block,which can improve the safety of the board-vehicle when it collects timber on the steep slope.

通过对集材板车的结构、集材方法及其安全性的研究，给出 4种改进技术措施，即使用木材捆扎机械装置、改进制动系统、增设铁制加强筋和使用制动导向滑轮，以提高集材板车在陡坡集材时的安全性改进后的集材板车在 4 0 0 0hm2 的林木集材试验中，安全可靠度达 10 0

The purpose of the research is to make the north-seeking system much more accurate and raise its speed at the same time. This paper analyzes the mechanical and electronic structure of the magnetic north-seeking system, introduces its working principle.

并在研究磁轴承简化物理模型和分析电磁轴承工作原理的基础上，推导了电磁轴承的电磁力计算公式，得出磁轴承的单自由度传递函数，分析了转子低速运行时的特性得出了系统传递函数。

Through the methods of calculation and graphic analysis, this paper discusses the design fabrication and working principles of heat-conducting oil system of ZYT28 asphalt pavement multi-function comprehensive curing vehicle in detail, and analyses the thermal balance.

通过计算、图示分析等方法详细论述了ZYT28型沥青路面多功能综合养护车导热油系统的设计制作与工作原理，并进行了热平衡分析。

Through the analysis of working principle and application of 1220 MAXI-PAV slipform paver ,this paper summarizes the adjustment methods of structural parameters for slipform paver to improve the cement concrete pavement.

通过对1220MAXI-PAV 滑模摊铺机的工作原理和实际使用分析，总结出如何正确使用调整滑模式水泥混凝土摊铺机的各结构参数，以保证摊铺机铺筑出高质量的水泥混凝土路面。

It is also known as one of the most poisonous naturally occurring substances.

它也被称为一个最自然发生的有毒物质。

The greatest stress is found at the location on the cross section where V is the largest.

最大应力出现在横截面上V为最大的地方。