生命周期评价在整体包装解决方案中的应用

论述了包装生命周期评价的实施步骤和过程,为整体包装解决方案提供依据。在分析整体包装解决方案设计开发和生命周期分析的基础上,总结了方案设计应遵循的包装总成本最低、包装减量化和无毒无害、包装可重复利用或回收再生原则,提出方案设计应满足现代绿色物流和绿色包装制度对包装的要求及节能环保和低碳经济的要求。     

Variance-Constrained Filtering Fusion for Nonlinear Cyber-Physical Systems With the Denial-of-Service Attacks and Stochastic Communication Protocol

In this paper, a new filtering fusion problem is studied for nonlinear cyber-physical systems under error-variance constraints and denial-of-service attacks. To prevent data collision and reduce communication cost, the stochastic communication protocol is adopted in the sensor-to-filter channels to regulate the transmission order of sensors. Each sensor is allowed to enter the network according to the transmission priority decided by a set of independent and identically-distributed random variables. From the defenders’ view, the occurrence of the denial-of-service attack is governed by the randomly Bernoulli-distributed sequence. At the local filtering stage, a set of variance-constrained local filters are designed where the upper bounds (on the filtering error covariances) are first acquired and later minimized by appropriately designing filter parameters. At the fusion stage, all local estimates and error covariances are combined to develop a variance-constrained fusion estimator under the federated fusion rule. Furthermore, the performance of the fusion estimator is examined by studying the boundedness of the fused error covariance. A simulation example is finally presented to demonstrate the effectiveness of the proposed fusion estimator.      

电力系统安全稳定校验的信息物理联合仿真方法

目的   为深入探究电力信息系统故障在信息物理融合系统（CPS）中对工程物理安全的影响机制,并确保研究结果易于复现和推广, 方法   通过开源软件搭建了电力变电站信息物理联合仿真的轻量级测试平台。基于电力监控系统的拓扑结构,通过Mininet搭建了变电站过程层网络的虚拟化框架,并在虚拟主机中调用Scapy模块自定义通信系统的故障类型,根据信息系统仿真结果修改安稳分析程序PSD-BPA的计算文件,外部调用暂稳计算核心求解工程安全结果,实现Mininet与BPA之间的数据联动,得到电力CPS轻量级联合仿真平台。 结果   仿真结果显示：变电站过程层网络中约64%的链路时延增加了10倍或以上,保护设备动作时间延缓至少12周波。根据文中提出的暂态稳定指标,部分站点在仿真周期内出现了严重的失步运行故障。 结论   基于暂态稳定指标的筛选结果成功量化了安稳控制设备的信息故障对电力能源系统的影响。     

基于GPS的电压相角测量算法研究

文中讨论了基于GPS统一时钟的电压相角测量的实现技术。探讨了过零测量法、离散Furier算法、递归Fourier算法和变速度同步采样的电压相角测量算法,分析了各种电压相角测量算法的优缺点及适用情况。     

高速公路路面水损毁机理分析与防水治理方案探讨

通过对我国混凝土高速公路路面水损毁机理分析,提出在路面承重层之上磨耗层之下做一层反应粘结型功能防水层,既能对承重层密封防水,又能消减面层反射性裂缝,达到提高路面使用舒适性、延长路面使用寿命的目的。     

华东电网CPS标准控制策略现状分析及展望

华东电网引入CPS考核标准后,华东四省一市电网对其AGC控制策略做出了相应的调整,以满足新的控制性能要求.华东各省市电网的AGC机组所占比例、以及AGC机组的水火电等组成比例均不相同,因此各电网的控制策略又都有差异.介绍了各省市依据各自的控制策略所实施的改进措施,并提出了进一步改进AGE控制措施的建议,以改善华东电网的控制性能.     

Operation of the IR-8 reactor with IRT-3M type fuel assemblies

The main features of the IR-8 reactor developed at the Russian Research Center ‘Kurchatov Institute' for investigations in nuclear physics, solid state physics, radiation chemistry, radiobiology as well as for radioisotopes production are described. The features of the IRT-3M type fuel assemblies (FAs) used in the IR-8 and other reactors are described. Data on the IRT-3M type FAs operation experience, confirming their high reliability up to average (by FA volume) burnup of uranium-235 (U-235) as >60%, are adduced.     

CPS工艺介绍及评述

介绍了CPS工艺的生产流程,机组设备组成,提出了此工艺目前存在的问题及对此工艺的评述。     

适合于并网型多重化逆变器的调制方法

并网型多重化逆变器各逆变桥的输出经变压器耦合后接入电网,提高了并网逆变器的容量等级。针对两单元多重化逆变器,提出一种载波相移正弦调制方法,可以在低次开关频率下提高系统的等效开关频率,提高各逆变器组工作的一致性,实现更好的谐波相抵效果,具有更快的实时性。最后进行了实验验证,该方法还可扩充应用到n单元并网型多重化逆变器中,应用前景好。     

试论手工雪茄卷制工厂的智能制造改造

智能制造已经成为全球性的制造业进步的风潮,手卷雪茄的加工周期长,手工工艺复杂,手工作业很难被机械化替代。在手卷雪茄如何实现智能制造,制造的柔性、订单的响应及时性、人力调度优化和生产计划的科学性如何保证,是一个有行业代表性的命题。利用CPS概念,全面规划和改造雪茄烟的智能制造实践,通过物料标识全面应用物联网采集,实现手工为主的作业的数字化车间和数字化工厂。