离散元-边界元动力耦合模型在地下结构动力分析中的应用

利用离散元 边界元耦合模型对溪洛渡工程地下厂房洞室群静、动力响应进行了分析，对离散元模拟地下结构的一些问题进行了探讨，得到了一些结论：离散元模型能够很好地模拟地下洞室群的变形，通过与边界元的耦合，可以模拟辐射阻尼的影响，由于辐射阻尼的影响，地下洞室群的地震响应比地面结构小很多。     

偶联剂处理对树脂碳刷结合性能的影响

在树脂结合碳刷的工艺中,将石墨粉或焦炭粉先用偶联剂预处理后再加入配料中,研究了偶联剂种类(KH550,KH570,NDZ-311,NDZ-131)及用量、热处理温度等对树脂石墨电刷抗压强度的影响,并对试样微观组织进行了观察.结果表明,加入的偶联剂,能使电刷的抗压强度增加,硅烷偶联剂用于水溶性酚醛树脂/沥青焦配料,能得到高抗压强度的电刷制品;并优选出了偶联剂KH570,其最佳加入值为石墨粉含量的0.5%～1.0%.     

光折变晶体中ps激光脉冲二波耦合增益正负转换现象

用二列脉宽为60ps的连续锁模Nd:YAG激光的倍频光在掺Ce的KNSBN晶体中进行二波耦合.当泵浦光脉冲迟于信号光脉冲到达晶体,或泵浦光脉冲虽先于信号光脉冲到达晶体.但时间提前量小于激光脉冲半高宽时.信号光的二波耦合平均增益是非负的;当泵浦光脉冲先于信号光脉冲到达晶体且时间提前量大于激光脉冲半高宽时.信号光的二波耦合平均增益可变为负的.对此给出物理解释.     

Design of a kinematic coupling for precision applications

To machine a complex precision product, several tools are needed. These tools are placed on a tool turret. A tool must return several times to its original position. To attain a very high repeatability between the upper part and the base of the tool turret mounted on a precision lathe, it is preferable that the parts of the tool turret are statically determined in their contacts. This is attained by using a kinematic coupling. To attain the required stiffness this coupling is provided with a preload of 1.5 · 10³ N. The machining forces are typically less than 1 Newton. A special kinematic coupling, consisting of grooves and balls, was designed, made, and tested. By providing the grooves with self-adjusting surfaces, hysteresis is reduced to less than one-tenth of a micrometer. Maximum stiffness is aimed at by using cemented carbide, a material with a high admissible stress, at the contact points. Experiments show that this kinematic coupling, under a preload of 1.5 · 10³ N, has a static stiffness of more than 1 · 10⁸ N/m in every direction and a repeatability better than one-tenth of a micrometer.     

天线互耦计算研究

用散射网络概念和天线口径面的平面波谱，把天线问题用网络方法来求解，推导出天线耦合公式，并利用这种耦合的计算方法，修正紧缩场中被测天线方向图的误差。     

压电涡流流量计用传感器材料的研制

重点对压电涡流流量用传感器材料的基本组成与性能关系、外加剂的种类与数量、制备工艺等进行了研究 ,现已研制成功性能优良的涡流流量计用传感器材料(ε=2502,d33=560,Kp>65%,Qm<100,精度 :模拟输出信号≤±1.0%指示值)     

Control of facies/potential on hydrocarbon accumulation： a geological model for lacustrine rift basins

The formation and distribution of hydrocarbon accumulations are jointly controlled by ＂stratigraphic facies＂ and ＂fluid potential＂, which can be abbreviated in ＂control of facies/potential on hydrocarbon accumulation＂. Facies and potential control the time-space distribution of hydrocarbon accumulation macroscopically and the petroliferous characteristics of hydrocarbon accumulation microscopically. Tectonic facies and sedimentary facies control the time-space distribution. Lithofacies and petrophysical facies control the petroliferous characteristics. Favorable facies and high porosity and permeability control hydrocarbon accumulation in the lacustrine rift basins in China. Fluid potential is represented by the work required, which comprises the work against gravity, pressure, interfacial energy and kinetic energy. Hydrocarbon migration and accumulation are controlled by the joint action of multiple driving forces, and are characterized by accumulation in the area of low potential. At the structural high, low geopotential energy caused by buoyancy control anticlinal reservoir. The formation oflithological oil pool is controlled by low interfacial energy caused by capillary force. Low compressive energy caused by overpressure and faulting activity control the formation of the faulted- block reservoir. Low geopotential energy of the basin margin caused by buoyancy control stratigraphic reservoir. The statistics of a large number of oil reservoirs show that favorable facies and low potential control hydrocarbon accumulation in the rift basin, where over 85% of the discovered hydrocarbon accumulations are distributed in the trap with favorable facies and low potentials. The case study showed that the prediction of favorable areas by application of the near source-favorable facies-low potential accumulation model correlated well with over 90% of the discovered oil pools＇ distribution of the middle section of the third member of the Shahejie Formation in the Dongying Depression, Bohai Bay Basin.     

Seawater desalination plant using nuclear heating reactor coupled with MED process

A small size plant for seawater desalination using nuclear heating reactor coupled with MED process was developed by the Instituted of Nuclear Energy Technology,Tsinghua University,China,This seawater desalination plant was designed to supply potable water demand to some coastal or island where both fresh water and energy source are severely lacking ,It is also recommended as a demonstration and training facility for seawater desalination using nuclear energy. the desing of small size of seawater desalination plant couples two proven technologies:Nuclear Heating Reactor(NHR) and Multi-Effect Destination (MED) process.The NHR desing possesses intrinsic and passive safety features,which was demonstrated by the experiences of the project NHR-5.The intermediate circuit and steam circuit were designed as the safety barriers betewwn the NHR reactor and MED desalination system.Wihin 10-200MWt of the power range of the hating reactor,the desalination plant could provide 8000 to 150,000m^3/d of high quality potable water,The desing concept could provide 8000 to 150,000m^3/d of high quality potable water,The design concept and parameters,safety features and coupling scheme are presented.     

小湾拱坝与地基联合作用的分析研究

本项研究结合小湾工程拱坝应力及地基渗流实际问题进行理论和实际应用两方面工作，本文主要介绍以渗流场与应力场耦合分析为基础建立的拱坝与地基联合作用分析方法，并对小湾工程进行了分析论证，肯定了设计可行性，作出了工程建议。