柴油机气缸套和活塞环的新发展

报道了日本ＡＤＤ公司为一种目标发动机开发的新的喷涂陶瓷的气缸套和活塞环的性能特点以及川崎重工业公司的Ａｋａｓｈｉ研究所为该发动机开发的新的活塞环密封方法－空气喷射密封法。试验结果表明：采用新工艺的陶瓷喷涂气缸套和活塞环的磨损率大为降低，平均寿命可延长一倍以上；新的活塞环密封方法亦具有减轻顶环压力负荷和积污，避免燃气窜入曲轴箱等优点。     

Potential Health and Safety Hazards of Marine Lubricants

1. Introduction Marine lubricants are generally formulated from highly refined mineral oils and special additive systems; a limited number of products Within the range utilize synthetic base oil (Morrison and Boyd, 1969). To ensure health and safty when using any petroleum product it is essential that: ●it is used only for the purposes for which it is intended, ●it is safety and hygiere conditions are observed. Health and safety aspects which is intended to assist the management of shipping companies to ensure that all personnel coming into direct contact With lubricants are familiar with the potential hazards associated With them,     

响应面法模拟轴肩和搅拌针形状对铝合金搅拌摩擦的影响(英文)

The present paper discusses the modeling of tool geometry effects on the friction stir aluminum welds using response surface methodology. The friction stir welding tools were designed with different shoulder and tool probe geometries based on a design matrix. The matrix for the tool designing was made for three types of tools, based on three types of probes, with three levels each for defining the shoulder surface type and probe profile geometries. Then, the effects of tool shoulder and probe geometries on friction stirred aluminum welds were experimentally investigated with respect to weld strength, weld cross section area, grain size of weld and grain size of thermo-mechanically affected zone. These effects were modeled using multiple and response surface regression analysis. The response surface regression modeling were found to be appropriate for defining the friction stir weldment characteristics.     

Development and validation of analytical method for the estimation of lamivudine in rabbit plasma

Lamivudine has been widely used in the treatment of HIV disease. A reliable, sensitive reversed phase high performance liquid chromatography （RP-HPLC） method was developed and validated for lamivudine ...     

欧洲稀燃直喷式汽油车型评估

稀燃汽油缸内直接喷射燃烧是一种很有前途的燃烧技术,可在满足未来排放要求的情况下显著提高燃油效率。虽然在美国市场上部分车型已实现化学计量比汽油缸内直接喷射技术的商业化运作,却还没有稀燃汽油直接喷射车型出现,而这种车型已在欧洲市场上市。美国橡树岭国家试验室获得了1台配装2.0 L稀燃汽油直接喷射汽油机的欧洲产BMW 1系轿车,利用底盘测功器对其进行测量,分别在美国行驶循环(联邦测试循环)、公路燃油经济性测试循环和US06联邦增补测试循环,以及稳态脉谱下检测了发动机和排气后处理系统的性能和排放。在研究过程中,同时对车辆使用轻度混合动力技术(发动机起动-停车系统和交流电机智能控制)时的性能进行了评估。对试验数据作了分析,并根据美国市场对燃油经济性和排放所提出的要求,量化了稀燃汽油直接喷射与轻度混合动力技术的优缺点。这些数据经过整理后将用于开发和运用常规或先进的动力总成车辆的仿真。     

铁路車辆的运行品质試驗(下)

走行部分和悬挂紋间的相对位移可由接在电桥內电阻的变化轉換为电量,这是为取得波形图所必需的。在进行科学研究工作的同时,必須采取实际的步骤以滿足实际制造工作的迫切需要。因此,1955年秋季举行了新轉向架設計展覽,提出的文件已由匈牙利車辆工业和国家铁路組成的委員会进行了审     

七、良师益友

做为一个管理人员,你不一定非得找一位指导人才能成功。但如果你有一个指导人,你的进步就会更加迅速,更加顺利。工作能力一直是工作能否领先的最重要因素。天资、努力再加点运气就足以使一个管理者获得晋级提升的机会。然而,很多有才干、工作非常努力的管理者在事业上却没有很大进展,出现这种情况,通常是由于管