Approximating scattered data with discontinuities

A method is presented for approximating scattered data by a function defined on a regular two-dimensional grid. It is required that the approximation is discontinuous across given curves in the parameter domain known as faults. The method has three phases: regularisation, local approximation and extrapolation. The main emphasis is put on the extrapolation which is based on a matrix equation which minimises second order differences. By approximating each fault by a set of line segments parallel with one of the axes, it is simple to introduce natural boundary conditions across the faults. The resulting approximation has, as expected, discontinuities across faults and is smooth elsewhere. The method is stable even for large data sets.This research was supported by the Royal Norwegian Council for Scientific and Industrial Research.     

立方相GaN外延层中堆垛层错的非对称性

通过TEM截面像和平面像的观察，对于用低压金属有机化合物气相外延（LP-MOVPE）法在GaAs（001）衬底上制备的立方相GaN外延层中的缺陷结构进行了观察和分析。结果表明，在立方GaN/GaAs（001）外延层中存在很高密度的堆垛层错，层错密度及其宽度在相互垂直的（110）方向上有明显的差异，闪锌矿结构中α位错与β位错间的差异可能是层错出现非对称性的原因。     

中国东部山西地堑系的形成机制及构造地貌,地震探讨

山西地堑系是中国东部重要独特构造地貌类型之一。中国有史以来记载了１７次８级以上大地震，而华北断块就有６次，其中３次集中于汾渭地堑。地堑系的形成大致分为３个阶段；（１）燕山期在ＮＷ－ＳＥ向主压应力作用下，使区内岩石破裂；（２）新生代以来，在ＮＥ－ＳＷ向主压应力作用下，断裂倾向一则，形成半地堑系；（３）由于太平洋板块和印度板块的俯冲作用，在断块下陷曲率最大处产生张性断裂，整个断块不均匀下陷，形成完整断     

一种新的LSI/VLSI电路测试方法

本文提出一种根据输出端值的变化频度测试LSI/VLSI电路I/O线上的固定故障的方法。该方法的优点是不需待测电路功能函数,也不需标准电路作比较。文章同时讨论用软件和硬件的实现方法。     

基于粗糙集的装备故障诊断系统的算法研究

通过设计基于粗糙集的装备故障诊断系统框架,以大屏幕投影系统的设备故障记录作为样本集,研究了粗糙集在装备故障诊断系统中的应用。针对数据预处理中缺失数据的填补问题,采用粗糙集理论和统计学理论相结合的方式,最大限度的保留了原始信息、产生规则的数量和可靠性;针对知识约简中规则生成速度慢等问题,采用了基于粒计算的粗糙集知识发现算法,将决策表中的属性集转换为二进制的矩阵对象,把复杂的知识约简转化为矩阵运算,降低了知识约简的时间复杂度,提高了生成规则运算效率,实现了故障诊断知识的快速自动获取。     

从新构造观点试论深圳市的地壳稳定性

处于莲花山断裂带西南段的深圳活动断裂带,新构造时期,尤其是全新世以来,断块的差异升降幅度和速率,水热活动,断块应力分布,断裂及地震活动性所反映出的地壳活动强度均处于较低水平,不具备产生大震的构造背景。深圳市建于深圳断裂带上,这里经过长期侵蚀,多已成为平原或谷地,是工程建设的良好场址。但基底破碎,增加了建设的投资和工程量;为确保城市的安全,仍应对深圳断裂带不同地段的近期活动性进行切实的监测。     

Reliable controller for nonlinear multiagent system with additive time varying delay and nonlinear actuator faults

In this paper, the problem of nonlinear multiagent system with reliable control is taken into account. The prescribed system consists of additive time-varying delay, actuator faults with both linear and nonlinear functions. The main focus of this paper is to design a reliable control which guarantees the stability and consensus condition of the proposed system. Actuator faults with linear and nonlinear functions are considered in the control input. From the implementation of integral inequality, the linear matrix inequality format is derived by constructing the suitable Lyapunov Krasovskii functional for the specified system. Terminally numerical examples are furnished for the efficiency of the specified method.     

武当山推覆构造结构模式

据地质和地球物理研究,作者提出“武当地块”是外来岩系组成的褶皱-逆冲推覆体,它是秦岭大型深层滑脱构造的一部分。武当山褶皱-逆冲推覆构造分四个构造带:主滑脱面—青峰断裂带、前缘叠瓦褶-断带、中央褶皱-推度带和后缘挤压-拉张带。在印支期,秦岭再生地槽-褶皱系的岩层和推覆体向南推覆到扬子地台之上,推覆距离约150km。它的发现和研究,为寻找与它有关的油气和固体矿产资源提供了新的思路和找矿方向。     

JEOL JSM-35C型扫描电子显微镜故障及排除

在介绍真空系统联锁控制流程图的基础上，选择了粗真空系统抽力变差、进样系统泄漏、真空联锁保护电路误动作、二次电子检测高压电路故障、二次电子检测电路故障、倍率放大器故障和图象放大倍率校正等七个有代表性的、已排除的故障实例进行深入分析研究，提出排除故障的思路和办法。