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This paper analyzes the characteristic of the Power Factor Correction of arc welding inverter power source , introduces the 12-pulse converter based on delta-type autotransformer connection into arc welding inverter power source ,and its configuration, design scheme and theory on PFC.

分析了弧焊逆变电源功率因数校正技术的特点，阐述了弧焊逆变电源中基于差接三角形自耦变压器十二脉波整流电路的原理与设计及其功率因数校正机理。

Determine to emphasize:"The whole party should be based on reality, had one's eyes on the future, catch the focal point, move forward wholly, studying the new situation, solving the new problem, establishing new mechanism, increasing the new ability constantly, strengthen and improve Party-building in an all-round way, make being in power of the Party general plan improve, in power system sound, ruling style science, in power foundation consolidate further further ".

决定强调："全党要立足现实、着眼长远，抓住重点、整体推进，不断研究新情况、解决新问题、创建新机制、增长新本领，全面加强和改进党的建设，使党的执政方略更加完善、执政体制更加健全、执政方式更加科学、执政基础更加巩固"。

The company has the formidable project executive ability, successively in provinces and cities and so on Beijing, Zhejiang, Tibet, Sichuan continues the city illumination transformation (traditional street light to change solar energy illumination), the urban road illumination, the city park and the residential district solar energy illumination, the city public transportation station desk lamp box illumination, the solar energy light bends down the power plant, the communication relay station solar energy power supply, highway supervisory system photoelectricity application engineering project and so on solar energy power supply, tunnel solar energy illumination.

公司具有强大的工程实施能力，先后在北京、浙江、西藏、四川等省市承接城市照明改造（传统路灯改换太阳能照明）、城市道路照明、城市公园与住宅区太阳能照明、城市公交站台灯箱照明、太阳能光伏电站、通讯中继站太阳能供电、高速公路监控系统太阳能供电、隧道太阳能照明等光电应用工程项目。

At present under the socialist market economy condition, completes the enterprise staff thought political work the key is the Central Party Committee 17 big spirits in every sense of the term implementations basic unit Since the specially reform and open policy, has had many head of undertaking, deceives both superiors and subordinates works for one's own interests under the guise of working for the public, thought the present does not have the movement, in the waist the animal pen axe, the fan which in the hand takes, often on greatly sends the arms, teaches whips the staff, often on to the authority coerces the staff, simply not staff when the person looked, the wages casually decides, bully softly, is hard feared, pays out the wages not to have the pay list, wants to give how many to give how many, Sunday does not let the staff rest, does not pay adds the spot to spend If you offer an opinion to him, regards you is the thorn in one's side, the thorn in the side, does everything possible to carry on retaliates you, and direct descendant wilfully tolerates using the hand in authority to oneself, to give the green light to something, to holds the different political view greatly to open killing They use in the hand two "magic weapon" to benefit as the third party in a dispute, deceive both superiors and subordinates flatter the higher authority, exploits power, violates the country head of undertaking the cadre relative about to forbid in this enterprise to be engaged in production management the stipulation Also uses in the hand the authority private full center pouch, is greedy, does everything possible to concoct pretexts makes the forged account, high keeps off the office supplies with the government money purchase modern age to converge the oneself to have, makes the forged account to reimburse the beach person cost, digs national the corner of a wall Then receives using the duty gives the sales commission,包产 outside the package exits the enterprise outside, fishes for the wealth, even allies the annual bonus, violates the country and the enterprise stipulated, then 参股using the duty manages the enterprise But greatly gives the discount in the staff benefit treatment aspect, in 工资分 is joined to greatly makes the issue, drills the national policy spatial, borrows the wage reform is the excuse, seeks the benefit for own clique, borrows the work then to provide the special sedan car for the enterprise basic unit leadership, all expenses completely are responsible by the unit, to become not to pay the solid private sedan car The party and the country stressed repeatedly that, strictly prohibits the leading cadre to exploit power, but such stipulation into head of undertaking cadre's neglected advice, really it may be said in has the policy, gets down has the countermeasure If the country does not carry on effective supervising and managing to the enterprise, does not carry on the strengthened management, gets down for a long time, they can depend on right and not the improper income become the millionaires and surely the wealthy man, the state asset can massively drain, but government's policy can become a mere scrap of paper, loses it in common people's prestige Let these clothes eating insects embezzle national the property, thus causes the enterprise to move towards goes out of business, such example is too numerous to cite individually The working class is the national master, such formulation until now is does not have the question, but present working class's actual condition how?

目前在社会主义市场经济条件下，做好企业职工思想政治工作的关键是把党中央十七大精神不折不扣的贯彻到基层。特别是改革开放以来，有不少的企业领导，欺上瞒下假公济私，认为现在没有运动，腰里苄着斧子，手里拿的扇子，动不动就大发干戈，训策职工，动不动就以权力要挟职工，简直不把职工当人看，工资随便定，欺出软，硬出怕，发工资没有工资单，想给多少给多少，星期天不让职工休息，不付加斑费。如果你给他提意见，就视你为眼中钉，肉中刺，想方设法进行报复你，利用手中的权力对自己和嫡系任意纵容，大开绿灯，对持不同政见者大开杀界。他们用手中的两件"法宝"渔翁得利，欺上瞒下讨好上级，以权谋私，违反国家关于企业领导干部亲属禁止在本企业从事生产经营活动的规定。还利用手中的权力私饱中囊，多吃多占，想方设法巧立名目做假帐，用公款购买现代高挡办公用品归为己有，做假帐报销滩人成本，挖国家的墙角。利用职务之便收授回扣，把企业外包产品外包出去，从中捞取钱财，甚至加盟人股，违反国家和企业规定，利用职务之便参股办企业。而在职工福利待遇方面大打折扣，在工资分配上大做文章，钻国家政策的空，借工资改革为借口，为自己的小集团谋利益，借工作之便为企业基层的领导配备专门的小轿车，一切费用全部由单位负责，成为名不付实的私家小轿车。党和国家一再强调，严禁领导干部以权谋私，而这样的规定成为企业领导干部的耳旁风，真可谓上上有政策，下有对策。如果国家对企业不进行有效监管，不进行强化管理，长期下去，他们会靠正当和不正当的收入成为百万富翁和千万富翁，国有资产就会大量流失，而政府的政策就会成为一纸空文，失去其在老百姓中的信誉。让那些蛀虫侵吞国家的财产，从而使企业走向倒闭，这样的例子不胜枚举。工人阶级是国家的主人，这样的提法至今是没有问题的，可是现在的工人阶级的实际状况又如何呢？

After years of practice and exploration, the company made great contributions to helicopter operations on patrol inspection of 500kv EHV electric power transmission line, live EHV transmission line insulator flush, hotline maintenance, wire setting-out, laser scanning and patrol inspection of UHV transmission line, filling in the gaps in the country and ensuring the safe stable operation of power network. The company has operations in the 500KV EHV Air Patrol, live maintenance, exhibition guide rope release, laser scanning and 1000KV Air Patrol operations and other special high-voltage electrical work on the helicopter filled a number of technical blank, to further ensure the security and stability of power grid to make an important contribution.

在多年的实践探索中，公司先后在500千伏超高压航巡作业、带电水冲洗绝缘子、带电检修、展放导引绳、激光扫描和1000千伏超高压航巡作业等直升机电力作业上填补了国内多项技术空白，为进一步确保电网的安全稳定运行做出了重要贡献。

Aluminum foil in polychromatic overprinter photoelectricity scanner tracking color standard position correction and manipulation of order: first switched on automatically overprinter the total power switch device, open the channel computer power supply and track scan power, photoelectricity scanning head alignment reflector and adjust the distance from far and wide, so that the reflector to be rendered on the minimum light point, at which point the detection distance of about equal to the focal length of the photoelectricity scanning head.

铝箔众色套印洋差平电扫描器跟踪色不本场所订侧和操纵挨次为：不后不切断被迫套印安装的总电源开关，开放各通道计算机的把持电源和跟踪扫描电源，不兵平电扫描脚差准不直射不活，调度远近间隔，使不直射不活上表现的平不面最小，此时的检测间隔约即是平电扫描脚的焦距。

Incurrent research, aiming at the rupture problem engendered in the shooting process of acertain 5.56mm automatic rifle, the strain and stress distributions on the cartridge caseunder the action of axial pull have been analyzed. Based on the theories of elastic-plasticmechanics and contact mechanics, a mathematic and physical model of the cartridge-caseand chamber system has been set up; and based on the platform of the general softwarepackage APDL of ANSYS for finite element analysis, a parameterized model of thecartridge-case and chamber system has also been established. The method for nonlinearFEA has been adopted to analyze the stress distribution on the entire cartridge-case andchamber system, and the method of contact element has been employed to investigate thecontact stress between the cartridge case and chamber, and then the influences of frictioncoefficient and locking space on the static and dynamic stress and strain response of thecartridge case and chamber to the action of power gas have also been discussed. On thebasis of a lot of numerical tests, a kind of element Plane13, which is concentrated incoupled computation of heat and construction, has been used finally to simulate thetransient response of the cartridge-case and chamber system to the power gas. Throughloading the temporary thermal characteristics of explosive gas in the procedure of emulate, the corresponding transient thermal stress distributed on the entire system under thecombined load of transient thermal stress and transient pressure has been obtained. Owingto these comprehensive considerations, the numerical results obtained in this paperrepresent the actual situations comparatively exactly.

本文针对某5.56mm自动步枪在工作中出现断壳的问题，分析了弹壳在轴向拉力作用下的应力应变；基于弹塑性力学及接触理论，建立了弹壳弹膛系统的数学、物理学模型，在通用有限元ANSYS软件的参数化建模工具APDL平台上，建立了弹壳弹膛系统的参数化模型；采用非线性有限元法计算了弹壳弹膛系统的整体应力，引入接触单元法分析弹壳和弹膛的接触压力，探讨了在不同的摩擦系数和不同的闭锁间隙对弹壳弹膛静、动态响应的影响；本文进行了大量的尝试，最后确定采用热、结构耦合单元Plane13，在计算中加载了火药气体的温度历程，成功的获得了弹壳弹膛系统在瞬态的热载荷和瞬态的压力载荷同时作用下弹壳弹膛系统的热应力数值解，考虑因素全面，比较真实的反映了弹壳弹膛系统在火药气体压力和热载荷下作用的情况。

The following exciting results are derived: 1 When considering the influence of some nonlinear elements such as hard-limit of exciters, the effects of some devices such as Power System Stabilizer, Unified Power Flow Controller and Static Var Compensator as well as using real parameter values of power systems in simulation , the SNB surface and the HB surface on the boundary of small signal stability region will turn close to each other and even coalesce together; 2 Under some conditions, coupling between slow exciters and shunt capacitors will bring negative damping in power system dynamics, which increases the possibility of oscillatory instability, so that a power system with mass shunt compensators is easily subjected to the oscillatory instability.

同时发现：1 系统中的慢速励磁，在某些情况下会与并联补偿电容器组产生负阻尼现象而显著降低系统的动态性能，大大增加系统出现振荡失稳的可能性；2 在采用较多并联电容器组补偿的电力系统中，更容易出现振荡型失稳。

Load model is representation of the relationship between the power and bus voltage. Load characteristics of power system have a significant effect on power system analysis of power flow and stability that includes transient stability, voltage stability and dynamic stability. The accurate load characteristics will help engineer to analysis power flow and stability.

中文摘要负载模型可反映负载功率和电压之间的相互关系，电力系统的负载特性对系统负载潮流及稳定度包括暂态稳定度、电压稳定度及动态稳定度的分析皆有著重大的影响，准确的负载特性将有助於电力工程人员在负载潮流与稳定度之模拟分析。

After China joined WTO, eleven national power corporations began to run, which symbolized the competition has been brought in the power trade, in the prices on the power net and in the separating power plant from the power net.

随着中国加入WTO，十一家国有电力公司和中国电监会的揭牌运行之后，标志着厂网分开、竞价上网，电力行业引入竞争机制进入了实质性阶段。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。