光纤传感器的标定曲线拟合与误差分析

本文介绍了一种求取实际光纤传感器标定曲线及函数的有效方法。以压电式光纤电压传感器实测数据为例，详细患解出了其标定函数和曲线，并进行了误差分析。     

流场拟合法在缩微环境中的研究

流场拟合法是由何继善院士提出的物理探测技术。以流场拟合法为理论基础研制的管涌渗漏检测仪在堤坝检测及抗洪抢险中发挥了重要作用，本文提出了一种在缩微环境中模拟管涌渗漏，对流场拟合法进行模拟测试并获得了明显的结果。为管涌仪器的性能检测、校验、标定提供了便捷的测试方法，并为该仪器在生产过程中统一性能和企业标准的制订提供了理论依据。     

三平板剪切干涉仪自动测试系统

三平板剪切干涉仪是环路剪切干涉仪中最简单的一种,它具有基本等光程、剪切量连续可调、两出射光束恒相互平行等特点。利用三平板剪切干涉仪对激光器出射波面质量进行检测,探讨了由剪切干涉图复原原始波面的1阶微分法,编制了专家辅助软件系统,为光机型的三平板剪切干涉仪配置了实时图像采集、处理系统,实现了光、机、电、算相结合,融硬、软件于一体的数字波面剪切干涉仪,并通过实验验证了方法的重复性精度。     

OPGW应用问题的探讨

根据多年的光纤复合架空地线(0PGW)应用经验与实践，从0PGW结构及组成、光纤余长、线路配合、金具配套、0PGW安装等方面，对0PGW应用中的若干问题进行详细的探讨。     

Comparative study on adaptive rational macromodels of highly resonant structures

Two macromodeling techniques using rational bases are investigated to accurately predict the natural frequencies of highly resonant microwave structures. Three methods are proposed and compared to calculate pole‐free solutions to the Thiele continued fraction and vector fitting pole‐residue models of the characteristic equation det[Z(s)]. © 2007 Wiley Periodicals, Inc. Int J RF and Microwave CAE, 2007.     

Consistency of robust estimators in multi-structural visual data segmentation

A theoretical framework is presented to study the consistency of robust estimators used in vision problems involving extraction of fine details. A strong correlation between asymptotic performance of a robust estimator and the asymptotic bias of its scale estimate is mathematically demonstrated where the structures are assumed to be linear corrupted by Gaussian noise. A new measure for the inconsistency of scale estimators is defined and formulated by deriving the functional forms of four recent high-breakdown robust estimators. For each estimator, the inconsistency measures are numerically evaluated for a range of mutual distances between structures and inlier ratios, and the minimum mutual distance between the structures, for which each estimator returns a non-bridging fit, is calculated.     

分偏移距动校正方法的改进

在地震资料处理中，速度分析和动校正对资料品质的影响很大。由于动校正速度是随偏移距变化而变化的，而常规速度分析并没有考虑这一因素，动校正效果往往不是很理想，从而影响资料的叠加和成像效果。分偏移距动校方法是在不同偏移距上采用不同的速度进行动校正。但由于是在不同偏移距组上分别独立进行速度分析和动校正，因此不能将不同偏移距组的同一反射同相轴校正到同一to层位上。这样就需要进行繁琐的后续处理，而且还会降低同相轴的连续性和平滑性。为此，对该方法进行了一些改进，即固定to在不同的分偏移距段进行速度扫描，段与段之间的衔接问题采用平滑处理解决。理论模型分析表明，采取上述改进措施后，动校正效果得到了一定提高，改善了同相轴的连续性和平滑性。     

CXFTV2: A Fortran subroutine for the discrete least squares convex approximation

A Fortan subroutine calculates the least squares approximation to n data values containing random errors subject to non-negative second divided differences (convexity). The method employs a dual active set quadratic programming technique that allows several concavities of an iterate to be corrected simultaneously, which is a distinctive feature of this calculation. A B-spline representation of the iterates reduces each active set calculation to an unconstrained minimization with fewer variables that requires only O(n) computer operations. Details in these techniques including the data structure that establishes the implementation of the method are specified. Numerical testing on a variety of data sets indicates that the subroutine is particularly efficient, terminating after a small number of active set changes, the subroutine being suitable for large numbers of data. A numerical example and its output is provided to help the use of the software.     

Solid Modeling Error : Analysis and Compensation

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