消谐动态无功补偿装置在橡胶行业的应用分析

橡胶行业中的密炼系统电动机耗电量大,非线性干扰性负荷变化迅速,易导致电力系统高次谐波,造成谐波危害。对密炼系统加装消谐动态无功补偿装置可以有效滤除谐波。通过分析具体数据,计算装置投入后的节电效果、技术经济分析及投入产出比较。消谐动态无功补偿装置已成为橡胶行业节电工作的一种有效措施。     

汽轮机常规热力试验和性能监测中的仪表问题

汽轮机常规热力试验和性能监测对电厂生产管理和节能有重要意义,而这些工作主要依赖大量的现场运行仪表。合理配置、正确检查和维护运行仪表,正确选择测点进行试验和计算是非常重要的基础工作,对这些问题进行了探讨,并提出了一些有效的方法。     

激光双截面转速波动法监测转轴动态扭矩

基于激光多普勒效应和转动动力学原理,提出一种直接监测转轴动态扭矩的新方法,并建立了数学模型。通过构造光学测试系统使4束高相干激光投射到转轴轴段两截面上4点,具有多普勒频移的反射光在光电探测器上发生混频,光电流频差正比于角速度。测得相邻时刻两截面的瞬时转速,得到轴段转速波动值及两端面相对转速波动值,进而实现转轴动态扭矩的直接监测。实验验证了该方法的可行性。与传统方法相比,该方法实时性强,具有较宽的动态范围,对动态扭矩的识别值提高了5%~10%,反映了转轴扭矩波动的动态特性。     

Maximizing the SDMA Mobile Radio Capacity Increase by DOA Sensitive Channel Allocation

In a cellular mobile radio system an SDMA (Space Division Multiple Access) component can be implemented for the reuse of radio channels physically incorporated by time, frequency or code slots. Since SDMA is based on the spatial separation of different users operating in the same channel, a DOA (Direction of arrival) sensitive channel allocation scheme is essential for maximizing system capacity. In this paper we present the Eigenvector method, a computationally efficient algorithm to do this job. We also present simulation results on the Eigenvector method operating in a typical urban mobile radio cell. The simulated blocking probabilities are then used to predict the capacity increase which can be expected after adding an SDMA component to a conventional mobile radio system.     

柔性臂动力学建模及比较研究

根据广义坐标的不同定义应用Lagrange方程建立了两种表达形式的水平面内转动的两自由度柔性机械臂动力学模型；分析了两类方程的不同特点和适用领域；将模型的仿真结果和实验结果进行对比分析，验证了模型的准确性；为柔性臂动力学分析和下一步研究提供了理论指导及重要的前提条件。     

面向对象的基于角色访问控制模型的探讨

提出一种应用于分布式系统的面向对象的基于角色访问控制(ORBAC)模型。基于角色访问控制,将权限与角色相关联,用户分配得多个角色从而获得与其关联的权限。引用对象的概念,通过策略控制器集中控制分散管理,为分布式系统提供高效的访问控制机制。模型考虑了静态和动态角色分配,并分析了面向对象访问控制模型的一些动态特性。     

高速补充信道对cdma2000-1x前向链路功率分配的影响

分析了cdma2000-1x系统的前向信道发射功率分配。通过仿真试验及理论推导，给出了导频信道和业务信道信号质量之间的相互依赖关系并绘出导频信号和业务信道之间的相关性曲线：根据这种相关性曲线，从而发现使总发射功率最小的最佳导频功率；最后提出并分析了高速补充信道对cdma2000-1x前向链路功率分配的影响。     

Joint relay selection and resource allocation in cooperative device-to-device communications

Device-to-device (D2D) communications allow proximate cellular user equipments (UEs) to communicate with each other directly under the control of base station (BS). In this paper, considering the selection relaying (SR) rule which allows a subset of potential relays to forward the source’s data to the corresponding destination, we first establish a multi-relay system model where a D2D UE can act as not only a source but also a potential relay for another D2D link, and then analyze the cooperation behaviors among selfish UEs. Next a simple strategy is proposed to deal with the relay selection problem, and then the fair and efficient resource sharing problem among cooperating D2D UEs is formulated as a bargaining game. Since the game function is non-convex, we turn to an iterative method by introducing an auxiliary function to get the proportional fair resource allocation results. The system efficiency and fairness are proved by numeral simulation results.     

字符串动态匹配算法在地层对比中的应用

提出改进的最大类间方差法通过计算有序序列最大类间方差、最小类内方差以实现测井曲线分层,弥补最大类间方差法只能将序列分成2类的缺陷。数值形式表示的曲线不便于对比的描述,提出将数值曲线序列提取特征并转换成离散的、相对抽象的字符串序列的方法,并以具有可以得到全局最优解特点的动态规划法为理论基础进行曲线对比。使用胜利油田地质科学院提供的真实地质数据,验证利用字符串进行动态匹配进行曲线对比在地层对比中的应用,实验结果表明,算法对地层缺失、地层尖灭和地层逆序的情况均适用,且具备简化特征提取、对比效率高的特点。     

Combined effect of nanoporous diluent and steam on catalytic upgrading of fuel oil to olefins and fuels over USY catalyst

This paper explores the effect of incorporation of a nanoporous silica as diluent for a USY catalyst in the presence or absence of steam, as a cost-effective hydrogen donor and regenerative agent, in the fuel oil upgrading. We found that the incorporation of inert silica in the catalyst particles in the presence of steam could produce more than 40 wt% of olefinic products, mainly propylene, in the cracked products. With the elimination of steam, the olefins yield became less than a half (about 17 wt%) and the reaction tended towards higher liquid yields (74.8 wt%) including gasoline and diesel fuel.