压裂泵往复密封性能及机理研究

根据流体动压润滑理论，对压裂泵柱塞密封摩擦副的润滑机理进行了理论分析。在排出和吸入行程，柱塞密封摩擦副均能满足流体动压润滑的条件，即在柱塞与密封界面上能形成并保持一定厚度的油膜润滑密封，从而达到减小摩擦提高寿命的目的；建立了摩擦界面油膜厚度和泄漏量的计算公式。利用有限元法理论，对密封圈的压力沿轴向的分布规律、泄漏量与压力变化关系进行了模拟计算。对往复密封圈沿轴向压力分布、泄漏量随压力变化进行了测试；试验结果表明，建立的计算模型具有较高的计算精度，揭示了压裂泵的密封机理。     

一维弹道修正模块设计与仿真

简要介绍了一种用于维弹道修正引信的执行机构。通过数学模型，结合MDT三机械设计软件和Working Model动力学仿真软件，对机构的受力情况和工作过程进行了数字仿真和系统分析，并通过对飞行弹道的模拟，得出了一维时间控制射程修正规律。     

浸入凝胶法聚合物膜形成机理的研究现状

从热力学、传质动力学、相分离机制和固化过程几方面综述了浸入凝胶过程中聚合物膜形成机理的研究现状 .指出浸入凝胶成膜过程是传质交换和由传质交换引发的相分离以及其后的固化过程之间相互竞争的复杂非平衡过程 ,膜结构是上述几个过程竞争的结果     

Experimental Study on the Effect of Steel-fibre in Conerete Thick Cap

The effect of steel fibre used in concrete was systematically analyzed by model testing of 30 2-pile thick caps of steel-fibre reinforced concrete, in which the model scale was 1：5. The experiment system composed of a loading device, strain measurement system and a data-acquisition system was used, also an electromechanic centigrade scale, a lens and a Y J-25 static resistance strainometer were used.The experimental results show that the volumetric rate of steel fibre and draw ratio have an important influence on its load-bearing capacity. The incorporation of steel fibre can effectively improve the extension and reduce the thickness of the caps.     

A multicriteria approach to identify investment opportunities for the exploitation of the clean development mechanism

The aim of the present paper is to investigate the prospects for the exploitation of the Kyoto Protocol's Clean Development Mechanism (CDM) in Greece. The paper is addressing 3 questions: in which country, what kind of investment, with which economic and environmental return? The proposed approach is based on a multicriteria analysis for identifying priority countries and interesting investment opportunities in each priority country. These opportunities are then evaluated through a conventional financial analysis in order to assess their economic and environmental attractiveness. To this purpose, the IRR of a typical project in each investment category is calculated by taking into account country-specific parameters, such as baseline emission factors, load factors, costs, energy prices etc. The results reveal substantial differences in the economic and environmental return of different types of projects in different host-countries and show that for the full exploitation of the CDM a multifaceted approach to decision-making is necessary.     

激光结晶a-Si:H SOI离子注入和快速退火

本文对激光结晶a-Si∶H SOI结构砷注入和快速退火行为作了研究.a-Si∶H激光结晶有Lp-LCR,OD,FCR-2,FCR-1四个结晶区.用剖面电镜观察了结晶区的结构.扩展电阻测量表明Lp-LCR区中有两种扩散机制,即杂质在晶粒体内扩散和沿缺陷扩散.OD区中有三种扩散形式,除有上述两种以外,还有沿缺陷的扩散.首次比较了沿晶界和缺陷的扩散速度.     

物探螺旋钻机钻杆液压夹紧机构的设计计算

利用ANSYS大型有限元分析软件,对新设计的物探螺旋钻机钻杆液压夹紧机构进行了数值模拟分析计算。分析计算结果表明,当钻杆液压夹紧机构的钳体材料选择ZG310-570,所用液压马达的排量为390 mL/r时,该系统在最小驱动压力4.82 MPa、最大驱动压力7.30 MPa时才能正常工作。这种数值模拟分析为进一步改善钻杆液压夹紧机构的受力,改进机构的设计提供了依据。     

状态监测与分析系统在大型机组中的应用

介绍了S8000大型旋转机械状态监测与分析系统在催化大机组中的应用及故障诊断。     

论国有企业激励机制和约束机制的设计

本文通过对建立国有企业激励机制和约束机制的过程中存在的问题进行分析，找出其产生的原因，并尝试提出国有企业激励和约束机制设计思路与对策。     

稀土对生物机体剂量效应机理的研究进展

综述了稀土元素对生物机体剂量效应的机理 ,从稀土对细胞质膜、细胞周期及细胞凋亡、Ca M水平调节的作用到对蛋白质、DNA的影响等不同层次和水平进行了探讨 ,以期为稀土在生物学领域的进一步广泛应用奠定理论基础