电容式变送器的一种故障的诊断处理

在生产过程中，有些电容式变送器出现输出为零的现象，影响到参数的测量或过程控制。通过生产现场的诊断和实验室测试，查出了产生该故障的部位。运用电容式变送器的工作原理，分析出了产生该故障的原因。该故障是由于传感器测量膜片或隔离膜片的弹性模量发生变化而引起的。介绍了消除这种故障的具体办法，并用此方法解决了多台电容式变送器的故障，取得了较好的经济效益。因而这种故障的消除方法具有一定的实用推广价值。     

统一潮流控制器(UPFC)的控制策略研究

首先在分析UPFC基本原理和主要功能的基础上，运用d—q变换，获得UPFC在旋转坐标系下的动态数学模型。针对电力系统的特点，采用改进交互控制方案构建UPFC的控制系统。最后给出Matlab／simulink环境下的仿真模型和仿真结果。     

汽轮机低压转子与发电机转子联轴器上的缺陷分析

针对国产引进西屋技术制造的600MW汽轮机由于制造上的原因，Ⅱ号加长轴与低压转子及发电机转子的联轴器上存在缺陷，在运行中使相邻轴瓦振动增大，联轴器螺栓承受剪切应力，影响机组的安全运行，提出具体处理意见及措施。     

藉助于先进的动态制功提高暂态稳定性(英文)

基于现代电力电子技术的先进动态制动，是提高电力系统输电暂态稳定性的最直接、有效的方法之一。本文从相平面分析方法出发，推导出一种先进动态制动的控制策略。计算机仿真的结果表明，先进的动态制动能显著地提高暂态稳定，还能阻尼输电系统的振荡。     

并行结构的电力有源滤波器设计

介绍了电力有源滤波器的基本原理和结构。采用并行结构控制设计了电力有源滤波器控制系统,并针对APF的保护电路、人机接口电路,在不同工况下进行了大量的动态模拟实验。实验结果表明,该电力有源滤波器的控制系统、保护电路及人机接口电路等均实现预期功能,整机运行稳定可靠并达到设计要求。     

Energy-based robust controller design for flexible spacecraft

This paper presents a class of non-model2based position controllers for a kind of flexible spacecraft. With the controllers, one can achieve not only the closed-loop stability of the original distributed parameter system, but also the asymptotic stability of the truncated system, which is obtained through representing the deflection of the appendage by an arbitrary finite number of flexible modes. The system dynamics are not explicitly involved in the controller design and stability proof. Instead, only a very basic system energy rehtionship of the flexible spacecraft is utilized. The controllers possess several remarkable advantages over the traditional model-based ones. Numerical simulations are carried out on a kind of spacecraft with one flexible appendage and satisfactory results are obtained.     

Using mega-fuzzification and data trend estimation in small data set learning for early FMS scheduling knowledge

Provided with plenty of data (experience), data mining techniques are widely used to extract suitable management skills from the data. Nevertheless, in the early stages of a manufacturing system, only rare data can be obtained, and built scheduling knowledge is usually fragile. Using small data sets, this research's purpose is improving the accuracy of machine learning for flexible manufacturing system (FMS) scheduling. The study develops a data trend estimation technique and combines it with mega-fuzzification and adaptive-network-based fuzzy inference systems (ANFIS). The results of the simulated FMS scheduling problem indicate that learning accuracy can be significantly improved using the proposed method involving a very small data set.     

低层高密度住宅与邻里交往

借鉴国外先进经验,结合国内现阶段实践,探讨低层高密度住宅的发展方向,研究传统居住模式的延续和再生,寻求低层高密度联排住宅的"人性化"设计所带来的居住的亲切舒适性、社区的认同感和聚居力、良好的邻里关系和自然宜人的空间尺度.从叶集经济技术开发区万花园小区规划设计入手,努力创造出尺度宜人、环境优美的多层次人际交往空间.     

A note on productivity gains in flexible robotic cells

Flexible robotic cells combine the capabilities of robotic flow shops with those of flexible manufacturing systems. In an m-machine flexible cell, each part visits each machine in the same order. However, the m operations can be performed in any order, and each machine can be configured to perform any operation. We derive the maximum percentage increase in throughput that can be achieved by changing the assignment of operations to machines and then keeping that assignment constant throughout a lot's processing. We find that no increase can be gained in two-machine cells, and that the gain in three- and four-machine cells each is at most 14 %.     

Disclosure in 3D of slit-membrane as well as -strands, and en-face basal lamina in situ of renal glomerulus of normal rats in embedment-free section transmission electron microscopy

With higher contrast and transparency due to the absence of epon and stereo-viewing effect due to thicker sections than conventional electron microscopy as methodological advantages, the renal glomerular slits were re-examined in embedment-free section electron microscopy. In addition to clear demonstration of strands bridging the slits in forms of ladders with highly irregular intervals and various extension-directions and length, this study disclosed clearly for the first time in the "section" TEM thin sheets which partially spanned the slit together with the strand-ladders. No strands were found to align in forms of typical zippers in normal kidney. Furthermore, en-face ultrastructure of the basal lamina in situ was clearly demonstrated in superimposed sites of the endothelial fenestrae with the slits.