被动土压力折减系数的研究

根据考虑变形的朗肯土压力模型 ,对被动土压力折减系数进行了理论探讨。结果表明 :被动土压力折减系数随内摩擦角的增大而减小 ;随着挡土墙位移量的增大 ,被动土压力折减系数也相应增大     

集成无源元件在无线系统中的应用及工艺

对在现代无线通讯系统中应用的无源元件集成化的主要解决方案进行了介绍与分析,并对比了半导体薄膜集成技术与厚膜集成技术的主要优缺点,以研发的一种薄膜集成RCD低通滤波芯片为例,介绍了薄膜集成无源元件的设计方法和主要工艺流程.     

An XPS and ISS investigation of passive layers on binary Fe-Al alloys

Passive layers have been formed electrochemically under inert conditions on sputter-cleaned Fe-Al alloys. The aluminum content was 8, 15 and 22 at%, which meets the homogeneity region of α-Fe in the Fe-Al phase diagram. The addition of aluminum reduces the active dissolution current density remarkably compared with that of pure iron. X-ray photoelectron spectroscopy (XPS) studies show an accumulation of aluminum oxide within the center of the passive layer, which is confirmed by elastic-ion scattering spectroscopy (ISS) and XPS depth profiles. Angular-resolved XPS measurements suggest a continuous structural change of the chemical film during its growth. A discussion of the investigations is presented on the basis of a model of oxide growth.     

Active/passive heating of an office building

This paper presents a periodic analysis to predict the enclosed air temperature for an active and/or passively heated office building in a climate where the solar intensity is small and the ambient air temperature varies about the freezing temperature of water. It also suggests a way to control the enclosed air temperature by adjusting the size of the collector and air flow rate.     

800nm布拉格反射镜型半导体可饱和吸收镜

我们在国内首先研制成功波长为800nm附近布拉格反射镜型半导体可饱和吸收镜。用布拉格反射镜型半导体可饱和吸收镜作为自启动装置，我们实现了氩离子激光器泵浦的钛宝石激光器被动连续锁模，获得了连续锁模脉冲序列，重复频率在100MHz到200MHz。     

恒电位－恒电流瞬态响应技术研究钝化膜多层结构──Ⅰ．多层结构钝化膜的P－G瞬态响应特征

采用恒电位－恒电流（Ｐ－Ｇ）瞬态响应技术研究了具有多层结构钝化膜的体系．分析了这类体系在钝化过程不同阶段的Ｐ－Ｇ瞬态响应特征．提出了判断钝化膜多层结构的方法以及表征钝化膜不同层稳定性的特征参数，并建立了描述复杂钝化体系Ｐ－Ｇ响应曲线的数学模型．研究结果证实所建立的模型能很好地反映体系的Ｐ－Ｇ响应特征．     

On passivity-based output feedback global stabilization of euler-lagrange systems

It is well known that in systems described by Euler-Lagrange equations the stability of the equilibria is determined by the potential energy function. Further, these equilibria are asymptotically stable if suitable damping is present in the system. These properties motivated the development of a passivity-based controller design methodology which aims at modifying the potential energy of the closed loop and the addition of the required dissipation. To achieve the latter objective measurement of the generalized velocities is typically required. Our main contribution in this paper is the proof that damping injection without velocity measurement is possible via the inclusion of a dynamic extension provided the system satisfies a dissipation propggation condition. This allows us to determine a class of Euler-Lagrange systems that can be globally asymptotically stabilized with dynamic output feedback. We illustrate this result with the problem of set-point control of elastic joints robots. Our research contributes, if modestly, to the development of a theory for stabilization of nonlinear systems with physical structures which effectively exploits its energy dissipation properties.     

交流无源电力滤波器整体参数优化选择

本文提出了交流无源电力滤波顺组整体参数优化选择的数学模型，运用Ｐｏｗｅｌｌ约束变尺度法编制了计算程序，通过对实例计算表明，计算结果具有良好的实用性和经济性。     

面空导弹被动式红外引信及其作用目标

从面空导弹被动式红外引信基本作用原理出发，在分析各种空袭目标红外辐射特性的基础上，讨论被动式红外引信对各种空袭目标的作用特点及引战配合，目标毁伤等问题。     

单舰多信息源多滤波器被动定位与跟踪

在许多情况下，方位是唯一可被利用的用于确定目标所在位置的信息。由于战场信息环境的复杂性，单信息源单滤波器无法满足被动定位时效性和精度的要求。因而，文中根据实际作战需求，分析目前常用的单舰纯方位被动定位方法的特点，提出了基于信息融合的多信息源多滤波器(MSMF)无源被动定位方法，给出了多信息源多滤波器被动定位时各定位结果权值的确定，运用时间序列估计传感器误差方差实现传感器权值的在线调整，仿真结果表明该方法较对单一信息源用单个滤波器进行纯方位被动定位精度有明显提高，对提高单舰纯方位目标定位的能力有一定的意义。