A Novel PDF Shape Control Approach for Nonlinear Stochastic Systems

In this work, a novel shape control approach of the probability density function(PDF) for nonlinear stochastic systems is presented. First, we provide the formula for the PDF shape controller without devising the control law of the controller.Then, based on the exact analytical solution of the Fokker-PlanckKolmogorov(FPK) equation, the product function of the polynomial and the exponential polynomial is regarded as the stationary PDF of the state response. To validate the performance of the prop...     

ISDN概述

ISDN是实现通信网数字化的必由之路，本文着重就用户／网路接口的基本接入和基群率接入规范作一简单介绍，列举交换机侧用户信令的格式及处理方法。     

螺杆马达微机CAD/CAM系统

CAD/CAM是设计及制造螺杆马达十分有用的软件系统,能解决螺杆马达在设计和制造上存在的问题。使用设计的CAD可提供所需的参数及数据,有助于提高设计质量和缩短开发螺杆钻具的周期;使用设计的CAM能明显地改善定、转子的加工精度,显著提高螺杆马达的总效率。     

H—空间中Fan Ky极小极大不等式的进一步推广

本文引出γ－广义拟Ｈ－凸（凹）的概念，借助于这一概念给出了Ｆａｎ Ｋｙ极小极大不等式在Ｈ－空间中的一种新的推广形式。作为应用，我们得到了一个在Ｈ－空间中的鞍点定理。本文结果改进和发展引文［１－５］中的相应结果。     

Characterization of dust collected in EAST after 2019 campaign

Dust presented in experimental advanced superconducting tokamak(EAST) with mixed plasmafacing materials has been collected and characterized for the first time. Dust at different positions in the vessel was collected by vacuum cleaner after the first experimental campaign in 2019. The shape, composition, and size of dust particles have been analyzed using different methods. About80% of the total number of dust particles have size between 20 and 80 μm, and most of dust particles are spherical, while schistose shape, columnar and irregular shape were also found.With the help of energy-dispersive x-ray spectroscopy different elements of dust have been identified, which is generally consistent with the different plasma-facing components in EAST.Both x-ray fluorescence and inductively coupled plasma emission spectrometer are complementary methods for measuring the dust composition quantitatively. It was found that the major components of dust were lithium dust in the form of lithium carbonate and lithium hydroxide, which is due to the routine lithium wall conditioning during EAST operation.     

立式转子-轴承系统动力学特性研究

建立了立式转子-轴承系统的动力学模型,采用Newmark数值方法研究了不平衡量及轴承参数对立式转子-轴承系统的动力学特性和稳定性影响并与卧式转子系统进行了对比分析.结果表明:和卧式转子相比,立式转子由于载荷轻稳定性差,稳定性对参数的改变也更为敏感.通过改造Bently-RK4转子-轴承系统实验台,试验验证了上述立式转子与卧式转子的动力学特性差别.研究结果对于立式转子-轴承系统的设计和故障诊断具有一定的参考价值.     

免处理版材色彩管理技巧

免处理版材对如今的印刷从业人员来讲应该都不陌生了,因为随着国家环保政策的收紧和市场的宣传,越来越多的印刷企业开始接受环保,并在印前制版做出了一些改变.在这样的背景下,所谓的终极环保,即免处理版材的应用就被推到了风口浪尖.那么,终极环保版材在实际使用中效果如何?技术是否成熟?在印刷上机前无法检版的情况下,色彩管理能否施行...     

钠离子电池储能技术及经济性分析

储能技术是构建能源互联网的关键支撑技术,是保障电网稳定运行、优化能量传输、消纳清洁能源、改善电能质量等的重要手段。电化学储能具备地理位置限制小、建设周期短等优势,是主流储能方式之一。目前,在电化学储能中发展最为成熟的是锂离子电池技术,但随着电动汽车普及和大规模储能应用,锂离子电池或将面临锂资源紧缺的问题。钠离子电池由于资源丰富、成本低廉、能量转换效率高、循环寿命长、维护费用低等优势,已成为目前储能技术的研究热点。本文对钠离子电池储能技术的可行性和经济性进行了分析,与当前主流储能技术进行了对比,从度电成本这一经济性角度分析了钠离子电池在大规模储能领域的优势,简要介绍了钠离子电池的应用场景及1 MW·h钠离子电池储能示范案例,并在此基础上给出了钠离子电池应用于储能电站的一些思考和建议。