无粘土冲洗液的降泵压性能研究

本文讨论了田菁减阻液的试验研究结果,即雷诺数、浓度、管径、机械降解及阳离子等因素对田菁减阻性能的影响。还探讨了紊流减阻的机理及介绍了田菁减阻液在岩心钻探中的初步应用效果.     

暗纹东方鲀、菊黄东方鲀和条纹东方鲀乳酸脱氢酶的比较研究

运用聚丙烯酰胺凝胶电泳的方法分析比较了暗纹东方鲀、菊黄东方鲀和条纹东方鲀的乳酸脱氢酶同工酶在不同组织中的电泳酶谱谱带的差异,结果表明:三种河鲀的心脏和肌肉组织都出现1条酶带,眼睛组织都有4条酶带,菊黄东方鲀和条纹东方鲀的大脑组织都出现4条酶带,而暗纹东方鲀的大脑组织却只有3条酶带;三种东方鲀的肝脏中都有5条LDH酶带,但酶带的分布却有着显著的差异,菊黄东方鲀和条纹东方鲀酶带分布比较相似.从LDH酶带迁移率可以看出,三种东方鲀眼睛和大脑组织中乳酸脱氢酶(LDH)酶带迁移率略显差异,但差异不显著(p＞005),在大脑中,菊黄东方鲀和条纹东方鲀比暗纹多出现一条酶带(该酶带的迁移率为0.118).上述结果表明淡水养殖的暗纹东方鲀与海水养殖的菊黄东方鲀和条纹东方鲀具有一定的差异性.     

超临界流体扩散和反应过程的奇异行为

分别从实验观测和理论分析角度,论述了多孔催化剂中超临界流体扩散、反应过程中出现的异常现象,总结了近临界区内扩散系数和本征反应速率常数的计算方法和步骤。在此基础上,对多孔催化剂中反应扩散过程在超临界条件下可能出现的奇异行为和变化规律进行了预测和分析     

Water in granulites: implications for the nature and evolution of the lower continental crust

The tower continental crust is one of the most important sphere-layers in the deep earth, and is the direct place where the crust-mantle interactions occur. Granulttes are the dominated rocks in the lower crust, and have critical implications for the knowledge of the composition, nature and evolution of the deep crust; fluids are important mediums influencing many geochemical, geophysical and geodynamical characteristics of the lower crust, and may also play a fundamental role in the petrogenesis of granulites and the formation of the lower crusts. In this paper, we review recent advances involved with the deep continental crust, granulites and fluids, and some longstanding debates. Combined with the Fourier-transform infrared spectroscopy (FTIR) analysis performed on the mineral assemblages (cpx, opx, plag and grt) in lower crustal granulite xenoliths and terrains (exposed section) from east China, it is suggested that structural water, dominated by OH, in these nominally anhydrous phases may constitute the most important water reservoir in the deep crust. This structual water may help to understand many lower crustal geological processes and phenomena (e.g. seismic activities and electrical conductive anomalies), and influences from these water must be taken into consideration.     

Analysis and Design of Circular Plate MR Fluids Brake

A magnetorheological (MR) fluids brake is a device to achieve brake by shear force of MR fluids. A MR rotary brake has the property that its braking torque changes quickly in response to an external magnetic field. In this study, the design method of the circular plate MR fluids brake is investigated theoretically. The equation of the torque transmitted by the MR fluids in the brake is derived to provide the theoretical foundation in the design of the brake. Based on this equation, after mathematically manipulated, the calculations of the volume, thickness and width of the MR fluids within the circular plate MR fluids brake are yield.     

新型钻井液润滑剂HML-1的配方优选与性能评价

钻井液润滑剂是一种重要的钻井液化学处理剂，它的作用是改善钻井液润滑性，降低井壁与钻具（或套管）之间的摩擦，降低钻柱旋转扭矩和起下钻阻力，从而 卡钴事故的发生。根据 钻井注传染病 剂存在的不足，研制了出了一种新型钻井液润滑剂。通过正交实验优选了润滑剂配方，经室内和现场实验证明该产品润滑性能好，与钻井液其它组分配伍性好，且无毒性，对环境无害。     

如何在电学实验中选配灵敏电流计

作为一个研究型物理实验教学项目，对在实验中如何选配灵敏电流计进行了探讨，给出了选配的条件和方法，并举例说明。     

电流变体及其在机械装备中的应用

电流变体是一种在外加电场作用下表现粘度发生显著变化的流体。近年来，作为一种智能流体引起研究人员的广泛重视。阐述了电流变体的组成、作用机理及其性质。在此基础上，研究了电流变体在机械装备中的应用。结果表明，将利用电流变技术设计的器件应用到机械装备中，可明显改善装备的技术性能指标。     

Analysis and Design of Cylindrical Magnetorheological Fluid Brake

Magnetorheological (MR) fluids consist of stable suspensions of magnetic particles in a carrying fluid such as water or silicone oils. The magnetorheological response of MR fluids results from the polarization induced in suspended particles by application of an external magnetic field. The interaction between the induced dipoles causes the particles to form columnar structure, parallel to the applied field. These chain-like structures restrict the motion of fluids, thereby increasing the viscosity and yield...