微波介质材料与器件的现状与发展

介绍国内外微波介质材料的发展历史以及现状,比较国内外微波介质材料的发展水平。总结基于微波介质材料的器件应用,同时展望微波介质材料及其器件的发展趋势。     

精细时程积分法在液压仿真系统中的应用

为了有效避免液压系统仿真过程中的刚性问题，引人精细时程积分法，相对于以往的计算方法，它不仅使仿真结果精确，且可以较为有效的避免刚性问题，取得了令人满意的效果。     

强化胎盘因子对细胞因子产生的影响

在观察了强化胎盘因子对淋巴细胞增殖试验影响的基础上,应用CTLL-2和7TD_1两种细胞株对强化胎盘因子刺激后的小鼠脾脏细胞分泌白细胞介素-2(IL-2)和白细胞介素-6(IL-6)水平分别进行了实验研究。结果表明,强化胎盘因子促进T淋巴细胞增殖,使小鼠脾脏细胞分泌IL-2和IL-6水牛均明显提高,有增强机体免疫功能的作用。     

往复式压缩机系统的管道振动分析

从动力分析角度，通过对往复式压缩机引起管道振动原因的分析，提出控制管道振动的方法；以海上已投产平台管道布置为例进行振动分析，通过计算管道因脉动引起管道振动的不平衡力，确定抑制管道振动的最佳方法。     

Determination of Critical Slip Surface of Soil Slope

A new complex method is presented considering not only the improvement upon the ＂bad ＂design point, but also the diversity of the newly generated complex, which is obtained by replacing the ＂bad ＂design point with the better design point located at the line between the ＂bad ＂design point and the ceotroid of the remaining design points of the old complex. The new complex method is applied to searching for the critical slip surface of two non-homogeneous soil slopes. The comparison of the results obtained by the new complex method with that by the basic complex method shows that the new complex method is much more likely to find the true critical surface for the randomly generated initial complex.     

海上单桩风力发电平台简化设计

采用在欧洲已经进行商业化运作的独立桩双段结构，桩基础采用带有过渡段的单桩。塔架上的风力发电机采用丹麦Vestas公司的V80风力发电机。参考DNV-OS-J101和API-RP-2A中的工作应力设计法，进行结构静力、桩基础的承载力，涡激振动、疲劳寿命，结构动力学等分析。静力分析分析极端环境下的组合工况；桩基础主要计算桩的轴向承载力和校核水平承载力，并采用有限元模型模拟桩土相互作用；涡激振动分析主要考虑不同风速下塔架的升力以及引起的横向振动；疲劳分析根据涡激振动分析的结果利用S-N曲线对基础寿命进行了评估；动力学分析求出了结构的固有频率，并进行了波浪力作用下的瞬态历程分析。     

影响沥青路面平整度因素分析及处治措施

从影响沥青路面平整度的各个方面查原因、找对策,总结对道路施工平整度的控制,特别是沥青路面施工平整度控制的经验,为公路设计和施工提供一定的参考.     

Dynamics of ships running aground

A comprehensive dynamic model is presented for analysis of the transient loads and responses of the hull girder of ships running aground on relatively plane sand, gravel, or rock sea bottoms. Depending on the seabed soil characteristics and the geometry of the ship bow, the bow will plow into the seabed to some extent. The soil forces are determined by a mathematical model based on a theory for frictional soils in rupture and dynamic equilibrium of the fluid phase in the saturated soil. The hydrodynamic pressure forces acting on the decelerated ship hull are determined by taking into account the effect of shallow water. Hydrodynamic memory effects on the transient hull motions are modeled by application of an impulse response technique. The ship hull is modeled as an elastic beam to determine the structural response in the form of flexural and longitudinal stress waves caused by the transient ground reaction and hydrodynamic forces. A number of numerical analysis results are presented for a VLCC running aground. The results include bow trajectory in the seabed, time variation of the grounding force, and the maximum values of the sectional shear forces and bending moments in the hull girder.     

单磁铁系统的稳定性与仿真分析

采用带状态观测器的气隙-速度-加速度反馈控制系统,在多体系统仿真软件SIMPACK平台上,考虑悬浮系统、电磁系统及控制系统的耦合作用,建立单磁铁-轨道梁-控制器的综合模型,模拟磁浮列车在弹性轨道梁上静止悬浮的过程,分析轨道梁的特征对车轨耦合振动的影响,研究共振的产生及解决方法,为磁悬浮列车的整车静止悬浮稳定性分析提供依据。