基于DSP的多功能电力仪表系统设计

设计一种多功能电力仪表,实现对电能的监控和管理．由TMS320LF2407 DSP和AD73360构成的数据采集和处理系统,利用AD73360对交流电流、电压的实时采集,并经过DSP计算得出电能相关参数．由CAN总线组成一个CAN局域网,实现现场分表与总表之间的通信．由于增加了CAN局域网,使该仪表具有了远程通信功能．     

并联式混合动力客车传动系设计与仿真

对混合动力客车（HEB）的传动系种类进行分析与探讨,设计某种并联式HEB的传动系,在MATLAB／SIMLINK仿真环境下,在满足车辆动力性要求的前提下,利用ADVISOR软件,以燃油经济性为主要目标,确定传动系主要部件的具体参数,并与纯内燃机客车的仿真进行比较分析。     

盾构施工大容量高压供电铝芯电缆接头温度自动检测装置设计

该文介绍了大型隧道盾构机采用铝芯电缆供电,对铝芯电缆接头温升进行检测和实时报警的设计研究,以期减少施工费用,提高大容量高压供电的安全性及可靠性。     

Development of the Inner Spherical CVT for a motorcycle

An Inner Spherical CVT (ISCVT) transfers engine power by utilizing the traction force of the lubricant fluid film on the contact point between concave and convex spherical rolling bodies. Since the concave and the convex contact surfaces of the ISCVT are exactly spherical parts, they have a large circular (not elliptic) contact area, and the ISCVT mechanism has a larger torque capacity, less spin loss, and better stability than other traction drive mechanisms. The IVT (Infinitely Variable Transmission) performances also can easily be embodied in the ISCVT. In this work, we developed a prototype of the ISCVT for a motorcycle with a 125cc single cylinder engine having a maximum torque of 13.73 Nm at 8,000 rpm. The design parameters were determined, and the transmission performances were evaluated by optimal design procedure. The transmission efficiency, the life time, the maximum severe stresses on each part of the ISCVT, and the work needed for varying speed ratio were theoretically investigated, and the efficiency performances were experimentally measured. The manufactured prototype was installed in an actual motorcycle, which was fixed on the test-bench equipped with a dynamometer. The parasitic loss of the prototype and the cross-sectional road load performance were tested. The power efficiency of the simulated prototype was between 87∼92%, and the life span was more than 50,000 hours. The tested overall power efficiency was around 70∼92% under frequent driving conditions, which is an impressive performance in a motorcycle transmission despite the small difference from the simulation.     

A GROWTH INHIBITOR SECRETED FROM CULTURED RABBIT SMOOTH MUSCLE CELLS IS DISTINCT FROM TGF-β

Smoothmusclecellproliferationiskeyeventinthepathogenesisofatherosclerosis(l).Growthfactorsreleasedbyarterialsmoothmusc1ecel1smainlyareplate1et-derivedgrowthfactor(PDGF)andfibroblastgrowthfactor(FGF)t'i.ArterialsmoothmusclecellsmaystimuIatesmoothmusclecellproliferationviaautocrineandparacrinethegrowthfactors,vasoconstrictorssuchasendothe-lial-l,thromboxane,prostag1adinH,andan-giotensin1.Incontrast,transformationgrowthfactor8(TGF-6),heparin,nitricoxide(No)andprostacyclin(PGI,)releasedbyart…     

基于ADAMS的中压直流断路器分闸运动仿真分析

根据对中压直流断路器分闸运动原理的分析,建立了中压直流断路器的动力学模型.应用弹性动力学理论,采用多体动力学机械系统仿真软件ADAMS对断路器进行分闸过程仿真分析.搭建了断路器机械特性测试回路,进行验证试验.试验结果表明,该断路器分闸动态特性试验结果与仿真结果相吻合,其性能指标能满足该断路器的设计要求.该仿真方法为中压...     

中小航运企业如何实施人力资源管理

对现代企业而言,企业人力资源的质量和水平决定着企业的生存和发展,企业可持续发展的动力在于人力资源的培养和使用。面对竞争日益激烈的航运市场,我国航运企业必须高度重视人力资源管理问题。中小航运企业受限于自身的资金规模、技术水平、管理方式等因素,在人力资源管理方面存在诸多劣势和不足,有必要在人才引进、管理、激励、考评等方面做出相应的努力和调整,找到其实施人力资源管理的现实途径。     

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目前我国城市交通量猛增，交通设施供给发展相对滞后，加上行人、自行车和机动车并存的混合交通状态使得交通问题在中小城市日益严重，中小城市在资金、基础设施、交通管理、交通参与者出行特征等方面与大城市有极大的区别。针对我国中小城市交通特征和道路交通问题的特殊性，从道路基础设施、交通管理、交通参与者等方面进行了深入分析，并就此给出解决我国中小城市交通问题的对策。     

基于C4.5 决策树算法的道路结冰预报模型构建与应用

为准确预报冬季道路结冰情况,保障交通运输安全,需要构建精度高、实用性强的道路结冰预报模型。将道路是否结冰抽象为二元分类问题,采用C4.5 决策树算法,以通辽地区历史日最低气温、日降水量、日积雪深度和道路结冰数据为训练数据,构建了道路结冰预报模型,并以赤峰地区和沈阳到锡林浩特特高压设备运输期间道路结冰预报为例对模型的准确率加以验证。计算结果表明,赤峰地区道路结冰模型准确率为93.3%,沈阳到锡林浩特特高压交流输变电主设备运输期间道路结冰预测结果与实际情况符合度高达86.4%。这表明基于C4.5 决策树算法的道路积冰预警模型准确度较高且实用性强,可作为我国东北部地区冬季道路结冰预报方法加以推广,也可为其他地区道路结冰预报提供参考。     

三电平逆变器电压空间矢量控制方法分析

详细分析了三电平逆变器主电路原理及工作模式,推导了在不同电压空间矢量三角形分区情况下电压空间矢量作用时间,并介绍了合成电压空间矢量的工作模式及开关的合理选择方式.在Matlab/Simulink环境下通过仿真实现了三电平逆变器电压空间矢量控制,仿真结果验证了理论的正确性.