应用PDM技术实施舰船辅机承制项目管理

分析了舰船辅机承制的特点,描述了在承制项目管理中运用PDM技术的基本方法,提出了项目管理物料清单(PMBOM)概念,并从管理和技术角度论述了必要性和可行性.     

PROTECTIVE EFFECTS OF CAPTOPRIL AND COENZYME Q10 ON THE MITOCHONDRIAL MEMBRANE－PHOSPHOLIPID INJURY OF LYMPHOCYTES IN PATIENTS

ＰＲＯＴＥＣＴＩＶＥＥＦＦＥＣＴＳＯＦＣＡＰＴＯＰＲＩＬＡＮＤＣＯＥＮＺＹＭＥ　Ｑ１０ＯＮＴＨＥＭＩＴＯＣＨＯＮＤＲＩＡＬＭＥＭＢＲＡＮＥ－ＰＨＯＳＰＨＯＬＩＰＩＤＩＮＪＵＲＹＯＦＹｕａｎＺｕｙｉ；，ＬｉｕＺｈｉｑｕａｎ；；ＺｈｅｎｇＸｉａｏｐｕ，Ｍ...     

TGN10型地铁车辆用DC1500VIGBT牵引逆变器

介绍了TGN10型地铁车辆用DC 1500V IGBT牵引逆变器的主要技术参数、主电路和总体结构,阐述了该牵引逆变器的保护方案。通过地面试验说明该逆变器的设计能满足技术要求。     

《中国舰船研究》2015年（第10卷）总目次

《中国舰船研究》2015年（第10卷）总目次     

Investigation of tailpipe and evaporative emissions from China IV and Tier 2 passenger vehicles with different gasolines

The limited understanding of vehicular emissions in China, especially evaporative emissions, is one obstacle to establishing tighter standards. To evaluate tailpipe and evaporative emissions, two typical China IV vehicles and one Tier 2 vehicle with an onboard refuelling vapour recovery (ORVR) system were selected and tested. One of the China IV vehicles was fuelled with gasoline, E10 and M15, respectively, to investigate the effect of fuel properties on vehicular emissions. For each vehicle, cold-start tailpipe emission tests were conducted first, followed by an evaporation test. Based on the emission factors and real-world vehicle activity data, the annual tailpipe and evaporative hydrocarbon (HC) emissions of each vehicle were calculated and compared. The results show that E10 and M15 significantly reduced the tailpipe CO and particle number (PN) emissions but seriously aggravated the NOx emissions, especially for M15. The hot soak losses (HSLs) and diurnal breathing losses (DBLs) were slightly impacted by the fuel properties. The annual evaporative emissions with E10 and M15 were higher than that with gasoline. The ORVR system effectively controlled the evaporative emissions, especially for DBLs. Evaporative emissions from the China IV vehicles were 1.1–1.4 times the tailpipe HC emissions. Additionally, the evaporative emission factors of the China IV vehicles were almost 50% lower than the standard (2.0 g/test), whereas their annual evaporative emissions were almost 1.8–2.8 times higher than those from the Tier 2 vehicle. Therefore, controlling evaporative emissions currently remains a great need in China, and the ORVR might be a recommended evaporative control technology.     

高速局域网络选型策略研究

网络高速化是计算机网络发展的重要体现之一,文中首先阐述了选择高速网络应考虑的各种要素,对流行的高速网络技术的性能进行了分析探讨,最后对各种高速网络技术的应用范围进行了研究并给出了相关产品。     

基于偏最小二乘回归的柴油机微粒排放预测

介绍了偏最小二乘回归算法的基本原理和详细算法步骤,分析了CO,HC和炭烟与微粒排放的相关性。以CO,HC和炭烟综合排放为自变量,以微粒综合排放为因变量,建立了基于偏最小二乘回归法的微粒预测模型。针对新优化匹配的参数,利用该模型对ESC循环每工况微粒排放进行预测。结果表明,模型预测结果与实测结果间差异仅为0.8%,验证了预测模型的可行性。     

万吨级斜拉桥平转阶段牛腿受力研究

以绥芬河斜拉桥转体施工为例,采用通用有限元程序对转体桥梁的重要结构—牛腿进行平转阶段受力研究。研究表明,牛腿在桥梁重力、预应力和牵引力共同作用下,整个结构呈现压应力为主的受力状态;预应力可使牛腿在桥梁转体发生意外倾斜时起到保险作用;牵引力对牛腿受力影响不大,但使牛腿产生了扭转趋势。根据牛腿各部分结构的受力特点及功能将牛腿划分成三个区域,即承重区域、保险区域和牵引区域。     

环己烷上氨基和羟基的选择性反应-PM3研究

运用半经验的PM3方法计算反应体系中各原子的电荷分布和热力学函数,得到反应的平衡常数与理论产率,并考察了环己烷上不同取代基（氨基或羟基）在有、无催化剂时的不同选择性。结果表明反应能在较宽的温度范围内进行,且产物的含量能达到50％。     

万兆以太网的核心技术及应用

着重介绍万兆以太网的核心技术及其在新领域中的应用由于以太网自身的优势,全球95%以上的局域网均采用以太网组网.而以太网技术也在不断的进步,万兆以太网更是突破了传统以太网的应用领域,已扩展到城域网甚至广域网中.