微系统

Results indicate that radial distance of the bushing from the rotor center and the radius of the hemispherical bushing significantly affect wear rate,and minimzing both two values will result in lowest wear for micro-rotor systems in MEMS.However,it is noted that the bearing radius sets a lower limit on the hemispherical bushing radius since the bushings are located beyond the rotor inner radius.It is desirable to reduce their effects on friction and wear on micro-rotors by regulating the radius of the bushing and the radial distance of the bushing from the rotor center within permissive range of micro-fabrication.Severe wear exists with increasing applied load and rotating speed of the rotor.Stress distributions in the contact region are different from Hertz solutions due to the convergence stresses apearing on the uncontinuous curvature line and the contact pressures display symmetrical parabola in the contact region.

结果表明：在MEMS微转子系统中，微转子轴衬偏心距离和转子轴衬半径影响线磨损率，以两者减至最小为较理想，但须注意设计中轴承半径的限制，并使轴衬偏心距离大于轴承内半径；在转子加工制造许可的范围内，可以通过调整转子轴衬的半径和偏心距离来减少摩擦磨损对微电机的影响，随着转子所承受载荷和转子旋转速度的增加，其磨损严重；接触区的应力分布不同于经典Hertz解，这是由于应力集中出现在不连续的曲率线上，且接触区的接触压力呈现轴对称抛物线状分布。

Microfluidic chip is one of the fronts of modern analysis sciences. As an important and fast developing component of uTAS, it will bring us dramatic advances through its promising application in the life science, environment science, medicine science and chemistry.

微流控芯片是现代分析科学的前沿技术，是微全分析系统的主要研究方向，将对生命科学、环境科学、医学和化学等领域带来革命性的影响。

A valveless micropump suitable for microfluidic system is presented.

介绍了一种适用于微流体系统的无阀微泵。

It show that interstitial fluid pressure changes its sig n twice within one arteriolar vasomotion period and it is therefor not important that interstitial fluid pressure is a little higher or lower than atmospheric p ressure; arteriolar vasomotion can periodically result in lymph formation and in terstitial total pressure plays an important role in this procedure; local regu l ation of microcirculation can meet metabolic need to some extent in the form of dynamic equilibrium.

利用解析法与有限元法相结合的&影响线算法&，求解了第一部分中建立的数学模型，分析了微循环系统动力学的若干重要问题，表明在微动脉自律运动周期内，间质流体压力将两次改变符号，因而某些理论中十分强调的间质流体压力是略高于或略低于大气压力的问题显得并不重要；微动脉自律运动能导致周期性的淋巴形成，间质总应力在这一过程中起着重要作用；微循环局部调节可以以动态平衡的方式在一定范围内满足代谢的需要。

The microfluid delivery and control operation unit is very important among all the necessary functional units used in microfluidic system.

在微流控系统所需的功能单元中，微流体驱动与控制操作单元尤为重要。

When microgrid is operated in islanded mode, VSGs can be divided into non-frequency regulation units and frequency regulation units, the former can generate power and participates in primary frequency control according to dispatching to mitigate system frequency deviation due to disturbances; the latter can offer referential voltage of microgrid and use secondary frequency regulation to implement no-error frequency control.

微电网孤岛运行时，将虚拟同步发电机分为非调频发电单元和调频发电单元，前者既能按照功率调度指令发电，又能参与一次调频，缓解扰动情况下系统频率的波动，后者提供微电网参考电压，并利用二次调频实现频率的无差控制。

Subunit network composed by manifold s and laterals which are all multi-diameter pipes is the important part of micro-irrigation system.

微灌是一种先进的节水灌溉技术，其田间管网是微灌系统的重要组成部分，组成田间管网的支管和毛管均为多孔出流管。

Based on the study of microfossils,51 fossil assemblages have been set up.

通过对其中的微体化石系统研究，建立了51个微体化石组合。

In addition, the exfoliation and intercalation of three kinds of novel layered aluminophosphate are investigated systematically, and mesoporous materials with high surface area chromium oxide supported aluminophosphate are synthesized successfully.

同时对三种层板具有规整微孔结构的层状磷酸铝的剥离与嵌入进行了系统研究，并成功地制备了高比表面的微介孔材料——铬柱磷酸铝。

Being from the technique current development level and the usage of it, this paper systemically disuses quite a number of concernments of the technique, for which count much of make MgO, MgO cement and concrete, the thermal and mechanical parameter of MgO concrete, the soundness of the Micro-expansion MgO concrete and the MgO cement construction equipments.

本文从该技术目前的发展水平，从使用MgO微膨胀技术出发，对于该技术关系重大的MgO膨胀剂制备、MgO水泥、MgO混凝土、MgO混凝土热学和力学性能、微膨胀MgO混凝土的安定性问题、以及MgO混凝土施工设备做了系统论述。

I am accused of being overreligious," she said in her quiet, frank manner,"but that does not prevent me thinking the children very cruel who obstinately commit such suicide.""

客人们在卡罗利娜·埃凯家里，举止就文雅一些，因为卡罗利娜的母亲治家很严厉。

Designed by French fashion house Herm è s, this elegant uniform was manufactured in our home, Hong Kong, and was the first without a hat.

由著名品牌 Herm è s 设计，这件高贵的制服是香港本土制造，是我们第一套不配帽子的制服。