Optimized Schwarz methods without overlap for highly heterogeneous media

In this paper an original variant of the Schwarz domain decomposition method is introduced for heterogeneous media. This method uses new optimized interface conditions specially designed to take into account the heterogeneity between the sub-domains on each sides of the interfaces. Numerical experiments illustrate the dependency of the proposed method with respect to several parameters, and confirm the robustness and efficiency of this method based on such optimized interface conditions. Several mesh partitions taking into account multiple cross points are considered in these experiments.     

i－line光刻高均匀照明系统光能分布的计算模拟

叙述了ｉ－ｌｉｎｅ光刻高均匀照明系统的均匀照明原理，以及其具有特殊面形（非球面）、特殊结构（非共轴）、超光学表面（由多个非共轴光学表面组成）的光学系统的光能分布计算模拟的原理、方法。作为例子，用所编写的程序计算模拟了我们近来设计的一曝光系统几个重要光学表面上具有权重的点列图和光能分布曲线。     

X-射线荧光增量法测定硅铁合金中的Ca、Ba

介绍了X-射线荧光增量法同时测定硅铁合金中的Ca、Ba，探讨了基体效应校正、扩展曲线的应用范围，方法准确度和精度高。     

改善高平均功率固体激光器光束质量的研究

本文首先概述了内含热透镜的激光谐振腔的分析方法，提出影响高平均功率固体激光器光束质量的主要因素是激光介质的热效应，尤其是非对称的热透镜象差。因此，改善光束质量的途径是补偿或修正透镜象差，使光束质量达到非相干多模振荡的理论值。     

复杂山区静校正方法研究及效果

对于山区地震勘探，开展静校正研究是资料处理的主要问题之一。静校正精度与剖面质量密切相关，准确的静校正取决于合理的方法和正确的应用。本文在分析了复杂山区特点以及静校正难点的基础上，指出要解决好山区静校正，仅限于普通的方法是远远不够的，必须从四个关键点人手，即风化层延迟时的求取、基准面的确定、校正速度的研究以及表层模型的建立等。本文对上述问题的研究做了介绍，展示了合成延迟时法十等效速度模型反演十变速浮动基准面（地震参考面）静校正等综合技术在太行山区（山西沁源、大寨）、伊J；1丘陵山区等复杂地表区应用的例子。显著的处理效果表明，严重的山区静校正问题得到了较好的解决，满足了地下构造的叠加成像，提高了勘探精度及其整体效果。     

Two years of operational use of Subpixel Automatic Navigation of AVHRR scheme: accuracy assessment and validation

Automated techniques for satellite imagery navigation and co-location are especially required for environmental monitoring activities intensively using satellite data. In this work are presented the results obtained after 2 years of operational use of the Subpixel Automatic Navigation of AVHRR (SANA) scheme. An automatic method for accuracy assessment of satellite navigation techniques, which permits a preliminary evaluation of their performances, dealing with a large collection of test images is also proposed. The navigation accuracy assessment, performed by using a selection of small islands as reference points, is discussed.Results achieved over more than 400 Advanced Very-High-Resolution Radiometer (AVHRR) scenes confirm that the SANA scheme is a very accurate one (computed mean navigation error is generally about one AVHRR pixel). Furthermore, because of its high processing speed, it can be considered a suitable tool for intensive satellite data processing in multitemporal analyses, especially required for environmental studies as well as for operational monitoring purposes.     

莺-琼盆地的独特埋藏史

通过沉积速率线性外推剥蚀厚度恢复、脱压实和异常高压以及古水深校正的单井埋藏史和连井埋藏剖面及构造沉降分析,发现莺-琼盆地是个多旋回沉积盆地,其沉积物埋藏过程可分为早期缓慢浅埋和晚期快速深埋两大阶段.这种独特的埋藏历史不仅是储层孔隙增生与保存的主要控制因素之一,而且极大地影响了烃源岩于酪根热解反应路径、烃类的运移和聚集,异常高压的发育以及所发生的复杂的水(气)—岩相互作用.涸11-4油田位于南海北部湾盆地涸西南凹陷,距广西北海市103km,离涸10-3油田17km.油田于1993年9月19日投产,目前开发形势较好,产量、压力稳定.在开发实践中我们体会到,要提高油田开发水平,搞好油藏监测是非常重要的.1钻井和完井过程中的油藏监测     

一种降低电离层梯度影响的Hatch滤波算法

目前,地基增强系统（Ground-Based Augment System,GBAS）中的主要问题是：尽管使用载波平滑降低了伪距噪,利用差分技术消除了用户和基准站间的大部分共同误差,从而减少了差分改正值中的误差。但是电离层时间梯度和空间梯度于这两个过程中产生了额外的误差,阻碍了差分改正值质量的进一步提高。基于对电离层时间和空间梯度引起的额外误差的分析,并考虑平滑伪距噪声,文章提出了一种新的Hatch滤波方法,该滤波器的时间常数是随卫星仰角、电离层时间和空间梯度以及用户与参考站之间的距离而实时变化的。该方法降低了差分改正值误差,提高了定位精度。并且通过差分定位仿真并对比传统的单频Hatch滤波方法,发现使用该方法后,减小了差分校正值的误差。     

基于去调频技术的斜视聚束SAR成像方法

针对具有方位谱混叠现象的斜视聚束式合成孔径雷达(SAR)成像问题,本文研究了一种基于去调频技术的成像方法.文中首先分析了斜视聚束SAR中的方位谱混叠现象,从理论上找出了斜视角影响方位粗聚焦的根本原因.基于分析结果,引入了回波信号非线性相位校正预处理法,彻底消除了斜视角的影响,从而得到正确的粗聚焦结果.然后基于斜视成像模型,推导了预处理回波信号的方位粗聚焦和精聚焦处理过程.在精聚焦的方位滤波处理中,针对非线性相位校正预处理导致的场景聚焦深度限制问题,提出了一种改进的非线性调频变标(NLCS)算法,实现了回波信号的高精度方位压缩.仿真实验结果证明了文中理论分析的正确性和所提方法的有效性.     

Compressive sensing SAR range compression with chirp scaling principle

Compressive sensing(CS) techniques offer a framework for the detection and allocation of sparse signal with a reduced number of measurements.This paper proposes a novel SAR range compression,namely compressive sensing with chirp scaling(CS-CS),achieving the same range resolution as conventional SAR approach,while using fewer range samplings.In order to realize accurate range cell migration correction(RCMC),chirp scaling principle is used to construct reference matrix for compressive sensing recovery.Additionally,error diagrams are designed for measurement of the performance of CS-CS,and some experiments of using real data are performed to deal with the errors caused by three conditions:SNR,sparsity and sampling.