可变进气组分发动机燃烧控制及分析

不同组分进气燃烧控制技术是探索发动机低排放、动力强化和解决高原环境适应性而提出的一项主动控制技术.通过氧氮份额调制控制和优化燃烧,是降低发动机污染的新途径.富氧可减少CO、HC等排放,特别在冷起动工况更加明显;富氮可降低NOx排放.着重论述了可变进气组分发动机燃烧技术的基本研究工作,分析了富氧和富氮燃烧控制的基本特性,阐述了存在的问题.     

高速列车闸片材料制动试验机的研制

针对我国即将建造的时速大于200km／h的铁路线路，研制既安全又耐用的制动闸片已成为当务之急。为了在模拟车辆的工作条件下，对粉末冶金复合材料闸片的性能进行研究，研制了一台高速列车闸片材料试验机，该机操作简单、安全，性能可靠，可用于对闸片材料配方和工艺的筛选研究，为进一步进行1：1试验提供性能较佳的闸片材料。     

Elastic Modulus Limit of Support Layer in Twin-Block Ballastless Track Based on Train Load Effect

The support layer is an important component of twin-block ballastless track. The modulus of the support layer is an important design parameter and must be carefully solved. We studied the bending stress and deformation of track slab and support layer due to train load using the beam-plate finite element model on elastic foundation. The results show that support layer type has great impact on both support layer deformation and the stress on subgrade, but has little impact on the bending stress of either track slab or support layer. The continuous support layer type, and articulated support layer type with shear transfer device at their ends, are recommended. In order to keep the stress in the support layer less than that in track slab, the modulus of the continuous, unit, and articulated types of support layer (in unit twin-block ballastless track), and the support layer in continuous twin-block ballastless track, should not be larger than 15, 22, 20.5 and 5 GPa, respectively. In addition, the modulus of the unit-type support layer should not be more than 20 GPa, to ensure the step in support layer remains less than 1 mm.     

STUDY OF T－LYMPHOCYTE SUBSETS AND INTERLEUKIN－2 AND INTERLEUKIN－2 RECEPTOR OF RESPIRATORY SYNCYTIAL VIRUS PNEUMONIA

ＳＴＵＤＹＯＦＴ－ＬＹＭＰＨＯＣＹＴＥＳＵＢＳＥＴＳＡＮＤＩＮＴＥＲＬＥＵＫＩＮ－２ＡＮＤＩＮＴＥＲＬＥＵＫＩＮ－２ＲＥＣＥＰＴＯＲＯＦＲＥＳＰＩＲＡＴＯＲＹＳＹＮＣＹＴＩＡＬＶＩＲＵＳＰＮＥＵＭＯＮＩＡＷｅｉＪｕｎ；Ｚｈａｏｐｅｉｘｉａ；ＹａｎｇＳ...     

柴油机滑动轴承早期损坏的原因分析与对策

轴承在商用汽车上应用十分广泛,从发动机、底盘到电气总成,都要用到轴承.滑动轴承主要用于发动机,通常分为2种:一种是衬瓦式薄壁轴承,形似瓦片俗称轴瓦;另一种是衬套,又称铜套,形状为空心圆柱体.衬瓦式薄壁轴承主要用于承托发动机曲轴和连杆,衬套主要用于支承凸轮轴轴颈及活塞销.     

高速公路服务区的经营管理

分析了高速公路服务区的特点，从目前高速公路管理现状出发，探讨了如何进一步提高经营管理水平的措施。