直流供电系统1500V线路保护方案探讨

直流牵引线路的保护,目前保护正确率低,时常出现误动和拒动情况较多,带来很多隐患,目前由于直流和交流系统不同,直流保护还在刚刚开始。最常现也是危害最大的是短路拒动问题,造成生产的不便和设备的损坏。     

应用木桶原理 搞好物资管理

通过对木桶原理的分析,总结和阐述了物资管理中的木桶原理及实际工作中存在的问题,并提供了一套切实可行、科学便捷的管理方法,以期不断提高物资管理水平。     

电阻式微压计测量方法与试验研究

介绍一种利用电阻变化来测量微小压差的方法,文中阐述了微压计的工作原理、推导了电压表示数与电阻关系计算公式并进行了误差分析,最后进行了实验验证。结果表明:该微压计测量精度很高,实验数据与理论符合较好,而且参数——压力差与电压差之间是线性关系。此外,此种微压计的测量范围比较大,实验时做到3~1000Pa。     

Modeling convection–diffusion processes based on a multidimensional integro-differential equation with degenerate parabolicity

An initial–boundary-value problem for a multidimensional integro-differential equation with degenerate parabolicity is considered. Based on the maximum-principle theorem and splitting method, a nonlinear monotonic high-order (higher than the first) numerical scheme is constructed for an implicit two-layer scheme. For the error of a numerical solution, a priori estimates are obtained and the sufficient convergence conditions are proved. A posteriori estimates for the numerical error of the solution are analyzed. Translated from Kibernetika i Sistemnyi Analiz, No. 2, pp. 83–96, March–April 2009.     

调节阀堵塞问题的研究

随着输油管道自动化程度的提高，调节阀作为一种常见的调节机构，在该领域得到了广泛应用。但是它容易被堵塞，这会使输油能耗增加，造成重大的经济损失。针对甬沪宁进口原油管道上某中间站出现的这一问题．详细介绍了调节阀的结构、工作原理、流量特性及运行工况，通过分析给出了解决办法，并提出建议预防这类问题的产生。     

Φ750×Φ1400/2800mm热粗轧机乳液真空过滤器及其应用

介绍了根据霍夫曼乳液过滤器工作原理制作的热粗轧机乳液真空过滤器的过滤原理及其应用。     

Meritocracy and opposition to affirmative action: Making concessions in the face of discrimination.

Typically, people who strongly endorse the merit principle and believe that outcomes should be given to those most deserving oppose affirmative action (AA) programs that violate this principle. However, how do they respond to AA when faced with a great deal of workplace discrimination? The authors hypothesized that people who care strongly about merit should be motivated to combat discrimination because it biases the assessment of merit. Consequently, these individuals should make concessions for AA. The authors found support for their hypothesis when investigating (a) participants' preexisting perceptions of workplace discrimination and (b) experimentally induced perceptions of discrimination. They discuss the implications of these results for the psychology of meritocracy and for resistance to AA. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

液压CAD图形库的组建与管理

本文为液压元件及系统计算机辅助设计(CAD的一个)子课题的研究报告。它是利用微机与APPLEⅡ兼容的紫金Ⅱ高分辨率作图功能,组建了图形库。并采用BASIC语言编制管理程序,形成一个绘图系统用以组织人机对话,交互式自动生成液压原理图及其存贮。     

涉及生态环境需水的水资源合理配置

对涉及生态环境需水的水资源合理配置问题进行了探讨，提出了面向生态的水资源合理配置问题、基于降水资源的合理配置问题、针对不同地区不同条件的配置方法问题及河流水资源配置的40％原则，并对相关问题进行了进一步的探讨，有助于对水资源合理配置理论的进一步认识。     

Lagrangian method for deriving electrically dual power converters applicable to nonplanar circuit topologies

This paper proposes a novel method for deriving dual converters, namely deriving current‐source converters from voltage‐source counterparts, and vice versa. The conventional derivation method is based on the transformation of circuit topology, in which series connections are converted into parallel connections, and vice versa. However, this method cannot be directly applied to nonplanar circuits because they do not allow perfect topological transformation, although many of them are known to have duals. Lagrangian dynamics does not depend on the topological relation to transform a system into another equivalent system; therefore, it possibly avoids problems related to topological transformation and may provide a universal and systematic method that can be consistently applied to nonplanar circuits. This paper discusses the derivation of duals using Lagrangian dynamics. Along with the theory, this paper presents two examples of Lagrangian derivation of duals. One derives a dual of a planar circuit, to which the topological transformation is applicable. The other derives two duals of a nonplanar circuit. Consequently, these examples suggest that the proposed method is a prospective candidate for universal and systematic derivation of duals. © 2016 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.