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Furthermore, to meet the self-starting and technique requirement, the design principle about fundamental dimension, stator winding type and matching number of poles with slots is presented. The motor parameters are calculated by FEM.

采用似稳态法研究起动转矩成分,依据分析结论,提出了一种简单可行的起动判据,并根据起动条件和工艺要求,提出了该类电机基本尺寸、定子绕组形式以及极槽配合的设计原则。

Mr. Jiang Zemin told students to compromise knowledge and practice actively and put forward the new demand to university about ways to cultivate talents on centurial anniversary of Beijing University.

江泽民同志提出的&坚持学习书本知识和投身社会实践的统一&[1]的殷切希望,为高校如何培养人才提出了更为明确的要求。

This thesis started from essential principles and methods of PE, then go for an overall analyzing original training system of XT Company including its active standards and methods. After the analysis, we raise several questions and go for an in-depth discussion. Then we put forward our suggestion that Standards of PE shall be made according to various positions and objectives and the employees who will be evaluated shall also have a voice in making the standards to improve its acceptability. The new PE system is objective oriented by mixed standards system and compellent distributed system etc.

论文从绩效考核的基本理论、方法出发,通过对改制后的XT公司培训体系的全面分析,以及对培训组织的原有考核标准、方法等的剖析,提出了原有的考核存在的几个问题,并就这几个问题深入展开讨论,对绩效考核指标的确定提出了新的要求,即根据绩效期内的工作目标确定考核指标以及被考核者参与制定考核标准与权重,以达到高接受性的目的;应用目标管理法、混合标准量表法等方法制定出以目标为导向的绩效考核方案。

Through analysis of the basic diathetic requirements that the reformation of maths education in high school in the twentyfirst century has set for teachers of maths of high school, authors of the thesis have outlined the goals of maths education in teachers′universities for the maths education major students.

本文从分析二十一世纪中学数学教育改革对数学教师的基本素质要求出发,提出师范院校数学教育专业的培养目标,并以此为基础,分析了现行数学教育专业课程体系的现状,找出课程体系改革中应处理好的几个问题,提出了以模块为基础的数学教育专业课程体系改革的初步设想。

Connected with cross section patterns of freeway, the design method of drainable base course system and edge drainage system which meet to request are given too. The aggregate grading and mixture ratio of porous cement-treated macadam are obtained based on accurate survey on material properties and lots of laboratory experiments. After the construction of experiment road, a summary of mixing, spreading, roller compaction and maintenance process about subsurface drainage system is made, and the analysis on the cost of construction about drainable base course is also carried. According to the test of coefficient of permeability, porosity and strength of compression about local test samples and core samples, the paper concludes that main performance index of subsurface drainage system has achieved the design anticipated effect.

结合高速公路横断面型式,提出了适合要求的排水基层排水系统和边缘排水系统设计方案;在进行详细材料调查和大量室内试验的基础上,提出了多孔隙水泥稳定碎石基层的集料级配和混合料配合比;修建了路面内部排水系统试验路,根据试验路工程的施工情况,对路面内部排水系统施工的拌和、摊铺、碾压和养护工艺进行了总结;并对排水基层造价进行了分析;通过对现场取样试件、芯样的渗透系数、孔隙率和抗压强度的测试,证明路面内部排水系统的主要性能指标均达到了设计预期的效果。

On the basis of electrical network characterization, Chapter 5 presents a new principle to detect PCB's fault first time. Three methods of online test for electrical network characterization are described in detail. Then, a hierarchical, combinatorial approach is firsfly presented. The test efficiency of this method is studied also. The experiment result shows that the new approach can greatly enhance the test efficiency of fixtureless tester under the requirement of 100% test for PCB's connections.

本文第5章利用集成电路的输出特性,首次提出了一种新的印刷电路板连接故障的检测原理,给出了三种印刷电路板电气网络输出特性的在线测试方法;在此基础上,首次提出并实现了基于飞针式在线测试仪的层式组合测试思想,研究了这种方法的检测效率;应用实例表明这种方法在不降低对印刷电路板连接故障100%测试的要求下,可以有效地提高飞针式在线测试仪的检测效率。

In this paper, the 3-D finite element relocating mesh method is used to calculate the temperature field and the thermal creep stress field of spillway dam and mid level outlet dam in certain roller compacted concrete gravity dam, sensitivity analysis have been down with different parameters, such as placing temperature, the location of cooling pipe, cooling temperature, time for water supply, ascended-layer of concrete, intermissive time and different placing time, and the commendatory construction scheme have been put forward in such analysis; according by the test result on the two scheme of concrete aggregate combination (basalt as coarse aggregate and limestone as fine aggregate, basalt as coarse aggregate and basalt as fine aggregate), simulation analysis on temperature field and thermal creep stress field of the commendatory construction scheme have been down, and analysis have also been down on temperature field and thermal stress field of the two different aggregate combination, the result indicates that the spillway dam and mid level outlet dam which adopted these two aggregate combination can both satisfy the require of design crack resistance in concrete, furthermore limestone as fine is better than basalt as fine aggregate; the effect of summer water storage and winter water storage on the temperature field and thermal stress field have been analyzed, comparing with winter water storage, in summer water storage scheme the maximum tensile stress at abnormal concrete in upstream fill is decreased by 0.1~0.3MPa and there are no evidence change of the maximum tensile stress at other parts, which indicate that summer water storage is avail for the crack resistance of upstream fill; according to the simulation calculating result and comparing temperature simulation calculating results and temperature controlling measures of some similarity projects both completed and construction, synthesis appraise have been carried to the design temperature controlling measures of dam, and the temperature controlling measures of this project have been brought forward, all these have great reference value on the design of temperature controlling measures and the optimization of the construction scheme.

本文采用三维有限元浮动网格法仿真计算程序,对某碾压混凝土重力坝的溢流坝段和中孔坝段分别进行了三维有限元温度场和温度徐变应力仿真计算分析,对浇筑温度、冷却水管的布置方式、冷却水温、通水时间、浇筑升程和间歇时间、不同开始浇筑日期等参数进行了敏感性分析,在此基础上提出了推荐的施工方案;根据两种骨料方案(玄武岩粗骨料+灰岩细骨料方案;玄武岩粗骨料+玄武岩细骨料方案)的混凝土性能试验研究成果,对推荐的施工方案进行了温度场和温度徐变应力仿真计算,并对比分析了两种不同骨料情况下的温度场和温度应力,结果表明溢流坝段及中孔坝段采用上述两种骨料均能满足混凝土的抗裂设计要求,且灰岩细骨料优于玄武岩细骨料;计算分析了夏季蓄水和冬季蓄水对坝体温度场和温度应力的影响,夏季蓄水方案与冬季蓄水方案相比,坝体上游变态混凝土区域最大拉应力小0.1~0.3MPa,其他部位最大拉应力无明显变化,夏季蓄水对坝体上游面混凝土的抗裂有利;根据仿真计算成果并通过比较国内一些已建和在建的类似工程的温度仿真计算成果及采取的温控措施,对大坝的设计温控措施进行了综合评价,并提出了该工程的温控措施,对温控设计和优化施工方案具有重要参考价值。

In the light of the design object of automation packaging production line of edible iodize salt distribution centers,firstly,a model restricted with environment factors of function information is established,and design specification is described too.

以食用碘盐配送中心的全自动包装生产线为设计对象,首先提出了生产线设计要求,并建立了以环境为约束的功能信息模型与设计任务书的描述;其次,从生产线功能信息模型着手,阐述了生产线的功能分解策略,并最终提出了以包装系统为关键子系统的设计方案。

After carefully analyzed the principle of standard SVPWM and traditional overmodulation methods, this paper proposed one simple and effective overmodulation scheme. Experiments were carried out in one 1.5kW induction motor and its results were recorded and analyzed by PZ4000 Power Analyzer and the proposed scheme were proved to be effective.

在分析了标准SVPWM算法和常见各种过调算法的原理的基础上,提出了一种简单有效的算法满足过调控制的要求,在1.5kW异步电机上进行了实验并使用PZ4000功率分析仪对其结果进行了准确测量与分析,证明了本文提出的SVPWM算法可以有效地提高电源电压的利用率。

Address the characteristics of non-uniform speed transmission, position function control and transmission ratio function control were presented to realize electronic gearbox. The differences between position function curve interpolation and general NC interpolation were analyzed. Considering the effect of uncontrollable continuous principal motion, interpolation slope and position function precompensation interpolation were presented. The relationship among interpolation, servo dynamic response and transmission precision was studied. The coordinate linkage relationship and electronic gearbox scheme in noncirclar gear hobbing were studied.

对电子齿轮箱实现非匀速比传动进行了研究,提出了位置函数控制与传动比函数控制两种非匀速比传动关系的实现方法;对位置函数控制方式,分析了位置函数曲线的插补与普通数控插补方法的区别,提出了插补斜率的概念与位置函数曲线的预补偿插补方法;对非匀速比电子齿轮箱传动精度进行研究,得出了插补精度、伺服系统动态性能指标与传动精度之间的关系;研究了非圆滚齿加工坐标联动的非匀速比传动关系,列出了多种可以满足要求的电子齿轮箱传动方案。4。

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And discuss some key point of integrated management system design, include hazard identification and risk assessment and risk control in the occupational health and safety management, the measure of satisfaction target of customer, the flawlessness of law system, the integration of the integrated management system and enterprise standardization system, unify lead institution and work orgnization, integreted internal audit and integrated management review.

同时,论述了一体化管理体系构建中的几个主要问题,包括职业健康安全管理中的危险源辨识、风险评价和风险控制、顾客满意度的科学监测、法律、法规体系的完善、一体化管理体系与企业标准化体系的有机结合、统一的领导机构和工作机构、一体化的内部审核和管理评审。

Deepwater Taranaki is investigated for its petroleum potential, using all available seismic data tied to shallow-water wells.

运用与浅水井相关的现有全部震波探测数据考察了深海区塔拉纳基盆地的油藏前景。

If you're huffing and puffing at any point during the run, slow down and make sure you can take deep breathes.

如果你任何时候在跑步过程中气喘如牛,降低速度并且确保你能够深呼吸。