SAR图像立体定位原理与精度分析

本文在导出ＳＡＲ图像成像方程式的基础上提出了ＳＡＲ立体定位的原理和方法,并从理论上分析了影响ＳＡＲ立体定位的主要因素。实验结果表明,本文提出的立体定位方法是正确的,影响定位精度的主要因素是交会角的大小与距离向量测误差,其与理论分析模型一致。     

Multi—quadric Equations Interpolation and Its Applications to the Establishment of Crustal Movement Speed Field

In this paper,multiquadric equations interpolation is used to establish a widely covered and valuable speed field model,with which the crustal movement image is obtained.     

Variable-density flow and transport in porous media: approaches and challenges

We review the state of the art in modeling of variable-density flow and transport in porous media, including conceptual models for convection systems, governing balance equations, phenomenological laws, constitutive relations for fluid density and viscosity, and numerical methods for solving the resulting nonlinear multifield problems. The discussion of numerical methods addresses strategies for solving the coupled spatio-temporal convection process, consistent velocity approximation, and error-based mesh adaptation techniques. As numerical models for those nonlinear systems must be carefully verified in appropriate tests, we discuss weaknesses and inconsistencies of current model-verification methods as well as benchmark solutions. We give examples of field-related applications to illustrate specific challenges of further research, where heterogeneities and large scales are important.     

Molecular dynamics modeling of stishovite

A Morse-stretch potential charge equilibrium force field for silica system has been employed to simulate the thermodynamics of stishovite with the molecular dynamics (MD) method. The equation of state, thermal expansivity and melting curve of stishovite have been obtained. This simple force field yielded results in accordance with the static and dynamic experiments. The stishovite melting simulation appears to validate the interpretation of superheating of the solid along the Hugoniot in the shock melting experiments. MD simulations show that the thermal expansivity of stishovite at lowermost mantle conditions is a weak function of temperature. The phase diagram of silica up to the mega bar regime is proposed based on the experimental and theoretical studies. The related physical and geophysical implications are addressed.     

各向异性介质中弹性波动高阶差分法及其稳定性的研究

稳定性是数值计算波动方程的最重要条件之一．本文就正交对称和六方对称各向异性介质中的弹性波动方程研究了时间和空间上差分精度可达任意阶的交错网格高阶差分法后，又导出了该方法的稳定性条件．为利用这种既精确又高效的数值方法来研究地震各向异性中的正反演问题提供了理论依据．     

含瓦斯煤的内时本构模型

根据瓦斯对煤的力学变形特性影响的实验结果，采用内蕴时间塑性理论，建立了含瓦斯煤的内时本构关系，给出了本构关系中材料常数的确定方法，并地实验验证。     

山东区域汛期旱涝预测概论

对1951－2000年期间汛期（6－8月）山东区域旱涝与全国主要多雨带的8个分布类型的逐年对应关系进行了具体的对比和论述。并对烟台、青岛、潍坊、济南、临沂、菏泽等6个地区汛期旱涝的天文、海洋、大气环流和气象要素等方面的预报物理因子进行了全面的普查、筛选、精选和综合分析，并分别建立了汛期降水量预报物理方程。并以青岛地区为例，对汛期降水理的多种交叉学科的预报物理因子进行了最优集成，为青岛地区和水量和旱涝建立了分多级的可操作的预报物理模型。该文优选出来的汛期降水的多学科物理因子对短期气候预测有重要的学术意义，其中所建立的预报物理方程和预报物理模型对山东省各区汛期旱涝的季度和年度预报有重要的应用价值。     

共线条件方程线性化

给出一种新的共线条件方程线性化方法 ,使共线条件方程线性化过程简明易懂 ,便于掌握。     

浅水流动的可压缩流数学模拟

利用浅水流动的可压缩流比拟来认识浅水方程组的特性及其有关物理现象,过去的讨论多限于矩形断面棱柱形明渠的最简单情况。本文首先将该模拟推广到任意断面非棱柱形明渠的一般情况,给出了等价绝热指数公式γ=H/h.(H为水力水深,h_c为形心水深),并指出γ=2为矩形断面的特例.然后着重阐明这一数学模拟对计算水力学具有普遍实用价值,并将计算气体动力学中的两种通量向量分裂(FVS)算法通过比拟应用于浅水流动计算。最后,本文讨论了浅水流动可压缩流模拟与一般完全气体可压缩流物理特性的异同点,据此提出正确应用这一模拟所应遵循的原则。