青藏客车车下DC 600 V/AC 380 V逆变器故障原因分析及改进建议

分析了青藏客车车下DC 600 V/AC 380 V逆变器的故障原因,并提出了相应的改进建议。     

V/X接线牵引变压器温升与寿命损失研究

V/X接线牵引变压器在高速铁路牵引供电系统中有着广泛的运用,本文根据IEC354标准温升模型中变压器各部分温升的计算公式,对V/X接线牵引变压器的温升和寿命损失做了深入的研究,分析了影响牵引变压器温升和寿命损失的因素,并对牵引变压器的容量合理优化提出了建议.     

OPTIMIZATIONS FOR 5-AMINOLEVULINIC ACID BASED PHOTODYNAMIC THERAPY IN PURGING LEUKEMIA CELL HL60

Photodynamictherapy(PDT),whichinvolves administrationofatumorlocalizing photosensiti zingagentthatmayrequiremetabolizingsynthesis(i.e.,aprodrug),followedbyactivationofthea gentbylightofaspecificwavelength.Thistherapy resultsinasequenceofphotochemicalandph…     

Assessing the Potential Impacts of Connected Vehicles: Mobility,Environmental, and Safety Perspectives

The connected vehicle is a rapidly emerging paradigm aimed at deploying and developing a fully connected transportation system that enables data exchange among vehicles, infrastructure, and mobile devices to improve mobility, enhance safety, and reduce the adverse environmental impacts of the transportation systems. This study focuses on micromodeling and quantitatively assessing the potential impacts of the connected vehicle (CV) on mobility, safety, and the environment. To assess the benefits of CVs, a modeling framework is developed based on traffic microsimulation for a real network located in the city of Toronto, Canada, to mimic communication between enabled vehicles. In this study, we examine the effects of providing real-time routing guidance and advisory warning messages to CVs. In addition, to take into account the rerouting in nonconnected vehicles (non-CVs) in response to varying sources of information such as apps, global positioning systems (GPS), variable message signs (VMS), or simply seeing the traffic back up, the impact of fraction of non-CV vehicles was also considered and evaluated. Therefore, vehicles in this model are divided into; uninformed/unfamiliar not connected (non-CV), informed/familiar but not connected (non-CV) that get updates infrequently every 5 minutes or so (non-CV), and connected vehicles that receive information more frequently (CV). The results demonstrate the potential of connected vehicles to improve mobility, enhance safety, and reduce greenhouse gas emissions (GHGs) at the network-wide level. The results also show quantitatively how the market penetration of connected vehicles proportionally affects the performance of the traffic network. While the presented results are pertinent to the specifics of the road network modeled and cannot be generalized, the quantitative figures provide researchers and practitioners with ideas of what to expect from vehicle connectivity concerning mobility, safety, and environmental improvements.     

共同探讨发动机控制单元电源供电系统

从丰田1JZ—G发动机ECU实物上测绘出它的电源供电系统原理电路,讲述其常供电电路、主供电电路的工作过程。介绍丰田2TZ—FE发动机电控单元、丰田LEXESLS400轿车ABS电控单元、日产蓝鸟1．8L发动机电控单元的供电系统电路,以此为基础指出《汽车发动机控制单元电源供电系统分析与探讨》一文中存在的问题。     

基于MS-Fortran Powerstation V4.0的有限元分析系统BNAP

介绍新一代Fortran语言编译器 (MS FortranPowerstationV4 0 )的主要特点及其进行有限元分析系统开发的相关步骤 ,最后给出具体的应用示例 .     

改善小型高速艇总体性能的措施研究

结合某项产品的设计论证和船模试验,对小型高速艇的总体性能进行了研究,提出了减小船体阻力、改善耐波性和减小船体振动的若干措施。     

我国地铁接触轨技术发展综述与研发建议

介绍了接触轨系统的构成、技术特征和我国应用接触轨技术的概况。在直流1500V接触轨系统的“四大环节”研究中,建议重点对系统设计标准及产品制造标准进行研究;在系统设计标准的“四大关系”研究中,建议重点对1500V接触轨与人身安全防护的关系进行研究。在钢铝复合接触轨的国产化工作中,应重点解决好不锈钢带与铝型材的结合问题,以及不锈钢带的材质和外型表面平顺问题。     

桥台填土引起的基底附加应力的研究

引起桥台不均匀下沉的因素很多,但桥台填土是其中最重要的因素之一。因此对桥台填土产生的附加应力进行深入研究是很有实际价值的。传统计算方法是应用规范,进行查表确定附加应力系数而后进行计算。从74到07的所有规范看,均沿用相同的计算方法。但规范中的计算方法具有一定的时代局限性,是在特定条件下（规定了路基宽度,边坡,锥坡及基础形式）、特定的计算能力（计算机还没得到广泛应用）下制定的。以现在道路发展状况看,规范中的附加应力系数有很多不足。因此,利用土力学中的叠加方法,针对不同路基情况进行深入研究是很有必要的。在此通过计算分析,提出计算桥台附加应力的适用的计算方法。     

参芪注射液对小鼠60Co射线放疗的增效和减毒作用

目的研究参芪注射液(SQI)对小鼠60 Co射线放疗的增效和减毒作用。方法建立小鼠体内移植性肝癌模型。放疗组小鼠经60 Co射线照射,联合组在照射基础上分别腹腔注射不同剂量的SQI,连续给药7d。计算各组的抑瘤率;测定白细胞计数、脏器指数、血清丙二醛(malonyl dialdehyde,MDA)含量及超氧化物歧化酶(superoxide dismutase,SOD)活性。结果 3个剂量组SQI与60 Co射线合用可发挥协同作用;各剂量SQI联合组均可提高小鼠白细胞计数及脾脏指数(P<0.01和P<0.05),同时对60 Co照射后引起的MDA含量升高和SOD活性降低有一定的逆转作用,且不存在剂量依赖性,而胸腺指数各组之间无差异。结论 SQI对小鼠60 Co射线放疗具有增效和减毒作用。