泌阳凹陷层序地层样式和油气评价

在建立泌阳凹陷层序序列的基础上，系统研究了核桃园组的旋回结构。考虑箕状盆地结构、构造活动特征以及沉积物供源方式。分别论述了盆地陡坡、深凹和缓坡的层序地层样式，指出不同地形区的层序地层叠置样式主控因素是有差异的。综合层序地层学和石油地质分析结果，提出了岩性油气藏勘探的有利区带。     

Measurement accuracy enhancements for wideband modulated signals

Time‐domain waveform measurements of wideband modulated signals, although attractive for communication systems modeling applications, have until now lacked the required accuracy for quantitative analysis. New developments described here enhance the accuracy of these measurements, enabling their application to communication system characterization and modeling. © 2003 Wiley Periodicals, Inc. Int J RF and Microwave CAE 13: 32–39, 2003.     

MC^2电缆介质结构及阻抗分析

本文将用数学和实验两种方法证实MC～2电缆不仅能保证特性阻抗变化不超出电缆技术规范。而且能保证在设计频率范围内电缆结构反射损耗最小。     

FD—TD在分析FSS中的应用

本文讨论了用FD TD分析FSS的有关问题,提出了一种适合于在任意入射角情况下分析FSS的有效吸收边界条件,分别以单层、双层FSS为例进行了计算.数值结果和矢量模式法、谱域法的结果非常一致.     

快速凝固Al—Li—Cu—Mg—Zr合金中H相的Z相的TEM研究

用ＨＲＴＥＭ、ＴＥＭ及ＥＤＡＸ分析研究了Ａｌ－Ｌｉ－Ｃｕ－Ｚｒ合金中的一种新相（暂名Ｈ相）和六角Ｚ相的结构，确定Ｈ相具有四方点阵，点阵参数为ａ＝２．８ｎｍ，ｃ＝２．４ｎｍ，ＥＤＡＸ分析表明Ｈ明和Ｚ相均含有Ａｌ，Ｍｇ，Ｃｕ。发现Ｈ相与Ｚ相的共存取向关系为［１００］ｈ｜｜［１１２０］ｚ，［０１０］｜｜［０００１］Ｚ。还观察到Ｚ相中一种特有有的旋转畴结构。     

有耗介质中电磁波传播的时域有限差分法

在推导有耗介质中Maxwell方程差分格式的基础上,详细讨论了时域有限差分法（FDTD）中主要参数的取值原则。对总场边界条件进行了改进,使入射波的泄漏很小,且不用对总场区的4个角点单独处理。讨论了简便的PML条件,避免了Berenger完全匹配层中场分裂过程。采用文中所介绍的方法,对地下有耗介质的理论模型进行了FDTD正演模拟,模拟结果可以反映地下有耗介质的有用信息,验证了该模拟技术的正确性和可靠性。     

动态矩阵控制系统稳定域的根轨迹分析

本文使用根轨迹技术从理论上分析了纯滞后工业过程参数变化对系统稳定性的影响,得到了一个与设计参数有关的稳定域,从而为设计参数自动整定提供了参考。     

THE ANALYSIS OF THE SEPARATED LAYERS ALGORITHM BY DOMAIN DECOMPOSITION METHOD

From the principle of of the Domain Decomposition Method (DDM), we analyse the 2nd-order linear elliptic partial differential problems and link the Separated-Layers Algorithm (SLA) with DDM. The mathematical properties of SLA and numerical example are presented to obtain satisfactory computation results. For general linear differential ones, also are the structure of SLA and its characteristics discussed.     

Modulation of the enzymatic activity of papain by interdomain residues remote from the active site

The two main catalytic residues Cys25 and Hisl59 of the monomericcysteine protease papain are located on different walls of acleft formed by two domains. This topology suggests a possiblerelationship between relative domain organization and catalyticmechanism. The effect on enzymatic parameters of structuralmodifications at various locations of the twodomain interfaceof papain was examined by individual or double replacementsby Ala of pairs of interacting residues. Most modificationshad no effect on enzyme activity. However, the enzyme's substrateturnover (k_cat) decreased following simultaneous alterationof the two most conserved residues, forming an apolar contactlocated 15 Å away from the active site. The pH activityprofile of the double mutant was unchanged, indicating a conservedionization state of the active site thiolate-imidazolium ionpair. This state is strongly dependent on the distance separatingthe two residues, thus suggesting that the active site geometryhas not been significantly altered. Efficient enzymatic activityin papain requires more than a correct active site geometryand is influenced by domain packing properties in a region remotefrom the active site.     

一种基于波束-频域处理的自适应波束形成方法

在天波超视距雷达中 ,通道之间的频响不一致影响了自适应波束形成的性能。去斜处理使得不同距离对应于不同频率 ,故不同距离单元的幅相不一致性与不同的频率相对应。经距离维FFT处理后 ,各路之间的通道不一致性得到降低 ,带内起伏趋于固定。基于上述特性 ,本文提出一种波束 频域处理方法 ,该方法不仅有效对消干扰 ,同时不会恶化天线方向图。更重要的是该方法降低了处理维数 ,减少了计算的复杂度。