一种用C语言实现的工业流程图形压缩方法

针对过程控制的特点,提出了一种工业流程图形的压缩方法。该方法节省了大量图形文件的存储空间,在工控机上调用时,易于实现过程参数的定时采集和控制。     

三面翻矸车的设计改进

通过对三面翻矸车的设计改造 ,将齿条式传动改为轴承式传动 ,分析了设计改进方案 ,有效地解决了卡齿、斗箱不能正常复位等问题。     

导航系统航迹仿真及应用

提出了一种模拟航迹的仿真算法,为捷联惯导算法的研究提供丰富的仿真数据。应用此算法设计模拟了一条航行轨迹,根据仿真得到的机体角速度对锥运动情况下旋转矢量优化算法的优劣进行测试,证明了航迹仿真对捷联惯导算法研究的重要性；根据仿真得到的位置信息,结合某型飞机的实际航行控制方法．由导航系统构成航行轨迹并在电子地图中进行定位和航迹仿真显示．证明了方法的可行性和有效性。     

基于改进遗传算法的反后坐装置故障诊断方法

反后坐装置是火炮射击故障率最高的部件之一。驻退机故障主要体现在驻退机内液量不足及节制环、驻退杆活塞套等零件磨损,完整火炮难以直接测量内部零件磨损量,因而驻退机故障诊断困难。通过建立反后坐装置后坐、复进运动数学模型,对射击中出现的驻退机故障及其原因进行了仿真计算,应用改进的遗传算法诊断了其故障原因,并用诊断实例验证了该方法的正确性与有效性。实例证明,该方法在火炮反后坐装置故障诊断方面具有速度快、精度高等优点,为火炮结构优化设计及故障论断提供参考。     

Crystal structure of poly(tetrafluoroethylene) homo- and copolymers in the high pressure phase

X-ray diffraction measurements are reported for 27°C, pressures to 5.2 GPa and concentrations of CF₃ units to 0.049 CF₃/CF₂. These show both orthorhombic and monoclinic structures to exist under high hydrostatic pressure. It is proposed that shear stresses generated at elastic inhomogeneities in the sample lead to the monoclinic phase. Energy calculations are consistent with this concept. They also indicate that conformational and rotational disorders raise the entropy of the high pressure phase III. Perfluoromethyl branches increase the volume/CF₂ of phase III more than that of the low pressure phase I. At high CF₃ concentrations and pressures, both phases become metrically hexagonal. The volume of transition becomes zero at a concentration near 0.05 CF₃/CF₂ and no transition is observed to a pressure of 5.2 GPa. There appears to be a critical point near 27°C, a CF₃ concentration of 0.05 and a pressure of 3.5 to 5 GPa.     

液—固磁场流态化模型及普遍化相图

本文考察了磁场流态化的基本特征,并结合实验分析了均匀磁场中液-固流态化模型参数的变化规律,对Ma 和 Kwauk 提出的指数模型作了补充,使之与经典流态化加以统一,并在此基础上获得了磁场流态化的普遍化关系图。完善后的模型可根据经典流态化的基础数据直接预示磁场作用下流态化的一些特征,模型计算结果与水-钢丸系统的实验数据吻合较好。     

Service behavior modeling and service behavior convergence-based radio resource scheduling in wireless systems

With the development of wireless networks,the amount of multiple services increased sharply in recent years.High quality multiple services with low price are urgently needed especially in new generation mobile communication systems,e.g.,3G/LTE networks.It is important to enhance the availability of data service resources.Services have strong association which are used by clients with similar behavior habits in networks.Such feature results in service behavior convergence(SBC)and its utilization will enhance resource efficiency.This paper proposes two applications of service behavior:service prediction and a scheduling algorithm which enhances bandwidth efficiency.Convergence cells are classified according to SBC and hot-spot services are broadcasted separately in each convergence cell.It is demonstrated by stimulation that the bandwidth is saved 80% more than classical cellular system and nearly 20 % more than traditional broadcasting system.     

管道生产信息网络拓扑分析及改进

随着数字管道的建设和发展,信息网络是实现生产管理智能化、事务处理自动化、数据共享远程化不可或缺的纽带和基础设施。针对某管道储运企业的网络建设情况,通过网络拓扑结构可靠性分析,从连通性和结合度的角度,对网络可靠性进行探讨,查找影响网络可靠运行的链路连通问题。在综合考虑投资与效益等因素,提出了基于原有拓扑结构,适当增加链路冗余,配置路由策略等改进措施,停机断网次数减少,有效地控制网络碎片产生,取得了明显的效果。     

T(z) diagram and optical energy gap values of Cd1−zMnzGa2Se4 alloys

The T(z) diagram of the system Cd_1−zMn_zGa₂Se₄ was obtained from x-ray diffraction and differential thermal analysis measurements. It was found that at lower temperatures, a single phase solid solution occurs across the whole compositional range and values of lattice parameters were determined as a function of z. At higher temperatures, an order-disorder transition occurs, in the range 0 < z < 0.6 to a partially ordered tetragonal structure and for 0.6 < z < 1. 0 to a disordered defect zinc-blende structure. In the T(z) diagram, both the ordering boundary and the solidus curve appear to show discontinuities at z = 0.6, corresponding to the change in the disordered phase. It is suggested that the symmetries of the terminal compounds are different one from the other. Optical absorption measurements were made at 300 K to show the variation of the direct optical energy gap E_o with z, and again the values appear to divide into two parts below the above z = 0.6.     

Experimental Research on Influence of Some Factors on Ejection Height of Cargo Projectile

Some factors influencing the cargo projectile’s ejection height in different conditions were analyzed by using harmonic curve diagram and cluster method.The test results of the ejection height for a certain cargo projectile show that the wind speed and direction are the main influence factors.For given meteorological conditions,the applied environmental stress becomes the main cause,while the launching angle does not influence the ejection height.