阀控铅酸蓄电池深循环性能的影响因素综述

本文考察了阀控铅酸蓄电池在深循环期间压紧程度、正极板栅伸长、电解液分层和串联电池间不均衡性的影响。如果没有合适的控制，上述这些因素的任何一个都将导致电池的早期失效。尽管最近几年在阀控电池性能上已取得了稳步的改善，但为了进一步改进循环性能需要对这些因素有更深的了解并将其最佳化。尤其阀控电池在使用期间，对正极板上压紧力有影响的隔板性能的变化知道得不多，关于板栅的伸长和电池设计对电解液分层的影响也需要有     

美国人谈管理之道 五、解决冲突

冲突是每一个组织都面临的实际问题。对待这类问题,宁愿不可能成功地解决,也不要回避。你应该采取用建设性方法解决冲突的策略。许多管理者认为冲突是不正常的,必然产生危害性,应当避免和制止。持这种态度的结果会造成一种不自然的气氛,使人们本能的侵犯行为和争论以更加不利的方式表现     

粘结式岩石锚杆设计中的解析模型

本推出了一个解析模型，用来表征静水应力场中圆形地下洞室附近被加固围岩的特性。该模型采用了弹塑性理论，并考虑了地层和粘结式(或摩擦式)锚杆间适当的相互作用机理。它着重探讨了锚杆布置型式对塑性区范围和隧道变形的影响，并引入一个无量纲参数来作为设计工具，它将隧道收敛和给定锚杆长度的锚杆间距联系起来。本介绍该模型的推求过程，并解释锚杆对洞室周围应力场和位移场的影响．扼要探讨了该模型在隧道设计中的应用。在随后的论中将详细给出用实验室模拟和现场测试结果检验该模型的情况。     

利用气缸盖与进气歧管集成实现动力装置 小型化和轻量化的模拟研究

商用车发动机要实现下一代严格排放与燃油经济性的目标,需要对内燃机的各个方面进行严格优化。从本质上来说,内燃机的效率是非常低的,效率范围仅为18%~40%。该效率范围是摩擦损失、泵气损失和废热共同作用的结果。目前,全球的汽车制造商都在通过各种途径努力解决这些问题,以期提高效率。其主要发展趋势是在更小的空间获得更高的功率,即发动机小型化,以及由此带来的发动机轻量化。设备制造商(OEM)正在挑战极限,使每升燃油行驶更多里程     

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 ...