Analysis and design of ribbon cables for high‐speed digital applications

Ribbon cables have been widely used as subsystem interconnections in a large number of digital systems, because they can convey numerous bits of a digital signal simultaneously. In this article, finite difference and finite difference time domain (FDTD) methods are used to analyze and optimize the electrostatic analysis design of ribbon cables, and measurements are used to verify the numerical results. © 2002 Wiley Periodicals, Inc. Int J RF and Microwave CAE 12: 148–158, 2002.     

故障类型及换位方式对同杆双回线回路间耦合影响的研究

从理论上分析了不同换位方式对两回路间耦合的影响，建立了同杆双回线路研究模型，用EMTP方法计算了一回停运检修时运行回路在正常和故障情况下对检修回路的耦合电压与电流，结果表明换位方式是双回线回路间耦合的决定因素；当带电回路发生故障时，停运检修回路应采取严格的安全保护措施，还提出了实际操作中的几点注意事项。     

变电站接地网对附近建筑物接地网和直埋金属管道的阻性耦合分析

利用矩量法定量地分析了变电站接地网对附近建筑物接地网和地下直埋金属管道的阻性耦合，获得了建筑物及管道在不同距离不同位置情况下的阻性耦合影响曲线。研究表明：当变电站接地网与建筑物接地网的尺寸一定时，前者地电位随二者之间的距离的增加而升高；当变电站接地网与建筑物接地网之间的距离一定时，二者的电位随建筑物接地网的尺寸的增大而减小；当有管道时，情况与上相似，但当管道垂直于变电站接地网放置时，其对变电站接地网电位的影响很小。在此研究基础上，提出了相应的防护措施，可为城市变电站接地网设计和城市规划提供一定的理论依据。     

Hyperchaotic behaviour of two bi‐directionally coupled Chua's circuits

In this paper, a non‐linear bi‐directional coupling of two Chua's circuits is presented. The coupling is obtained by using polynomial functions that are symmetric with respect to the state variables of the two Chua's circuits. Both a transverse and a tangent system are studied to ensure a global validity of the results in the state space. First, it is shown that the transverse system is an autonomous Chua's circuit, which directly allows the evaluation of the conditions on its chaotic behaviour, i.e. the absence of synchronization between the coupled circuits. Moreover, it is demonstrated that the tangent system is also a Chua's circuit, forced by the transverse system; therefore, its dynamics is ruled by a time‐dependent equation. Thus, the calculus of conditional Lyapunov exponents is necessary in order to exclude antisynchronization along the tangent manifold. The properties of the transverse and tangent systems simplify the study of the coupled Chua's circuits and the determination of the conditions on their hyperchaotic behaviour. In particular, it is shown that hyperchaotic behaviour occurs for proper values of the coupling strength between the two Chua's circuits. Finally, numerical examples are given and discussed. Copyright © 2002 John Wiley & Sons, Ltd.     

汽轮发电机轴系联轴器液压螺栓介绍

针对传统汽轮发电机组联轴器螺栓拆卸时往往出现卡涩的问题,大亚湾核电厂引进了一种新型的联轴器液压螺栓。这种螺栓采用类似“膨胀螺栓”的基本原理,安装或拆卸时联轴器螺栓易于穿进螺栓孔或从螺栓孔中抽出,机组运转时联轴器螺栓与螺栓孔紧密配合,大大降低了故障率和劳动强度,提高了机组检修质量,缩短了大修时间。为此,介绍了液压联轴器螺栓组件的结构、特点和工作原理,以达到对液压联轴器螺栓一般认识了解的目的。     

并联管系统中气－液两相流分配特性的实验研究

通过对由联箱连接的Ｚ－型和Ｕ－型系统中的并联分支管束中的两相流流动的分配特性的试验研究，找出了各分支管中两相流的总质量流量和气相质量流量的分配规律，并分析了引起流量分配不均的原因     

偶联剂对B_4C／PP共混体系的增容作用

Ｂ４Ｃ／ＰＰ共混纤维是重要的防中子辐射材料。通过Ｂ４Ｃ／ＰＰ共混体系流变性能及纤维的形态结构性能的研究，分析了钛酸酯偶联剂在Ｂ４Ｃ／ＰＰ共混体系中的增容作用，表明了最佳偶联剂的品种和用量分别为ＮＤＺ－１０１和１．５～２．５％．     

中空玻璃微珠填充环氧树脂复合材料

讨论了用发电厂固体废料中的中空玻璃微珠填充Ｅ－４４环氧树脂制备轻质复合材料，实验详尽地考察了微珠填料，ＫＨ－５００偶联剂，固化剂（三乙基四胺，Ｔ－３１，三乙醇及液体四氢苯酐）及低聚酰胺等增韧剂等对所得的复合材料为力学性能的影响，并通过扫描电镜（ＳＥＭ）观察了材料的形态，其结果表明，偶联剂和增韧剂对复合材料的力学性能影响较大，中空玻璃微珠填充环氧树脂赋予基轻质，高强，价廉等特性。     

EFFECT OF SILANE ON THE SURFACE OF SEALING GLASS

This paper,through XPS and IR analyseson the surface of sealing glass,identifies that the surfacetreatment of sealing glass by silane is a chemical process.Onthe basis of the analyses,the authors suggest an ideal chemicalbonding status between silane and glass surface.     

偶联处理对粘结钕铁硼永磁的性能影响

本文研究了硅烷偶联剂包覆处理的快淬ＮｄＦｅＢ磁粉的抗氧化性、尼龙１０１０粘结ＮＮｄＦｅＢ的永磁性能和力学性能等。结果表明ＫＨ５５０包覆ＮｄＦｅＢ可改善ＮｄＦｅＢ磁粉来的抗氧化性，并可提高粘结ＮｄＦｅＢ的磁性能和压缩强度。