汽车空调冷凝器腐蚀试验的表征与评价

介绍了汽车空调冷凝器的腐蚀试验程度及方法，对试验后的冷凝器进行了密封性检查，并用光学显微镜和扫描电镜检测和分析了材料的显微结构，焊接质量，腐蚀性质及其腐蚀深度等。通过对冷凝器的宏微观检查与表征，评价了冷凝器质量的优劣，提出了改进措施与建议。     

医院空调设计的几点体会

空调系统应用于普通房间可能引起空调病 ,应用于医院时此问题将更为突出 ,本文对此类建筑在空调系统设计中应重视的有关问题进行了初步探讨     

三维精细积分法地震正演及边界条件

 将任意差分精细积分法用于三维波动方程地震正演，关键在于如何消除数值计算中有限波场区域边界引起的边界反射。文中采用Berenger给出的电磁波完全匹配层吸收边界条件，推导出三维波动方程任意差分精细积分法地震正演的完全匹配层吸收边界条件计算公式，并给出了完全匹配层吸收边界条件算例。计算结果表明，此方法压制边界反射效果明显。三维波动方程地震正演模拟实例表明，完全匹配层吸收边界条件的任意差分精细积分法为复杂区地震波传播规律研究提供了一种实用的正演模拟工具     

1960年以来渭河下游河道的自动调整作用

1960年以来，渭河下游河道来水来沙条件和边界条件都发生了较大的变化，河道纵横剖面形态针对这些变化进行了相应的调整，通过分析河相关系、主槽面积、河底高程以及弯曲系数的调整规律，对渭河下游河道的自动调整作用进行了研究。     

Necessary optimality conditions in a nonsmooth control problem with variable structure

An optimal control problem with nonsmooth performance criterion described by a system of ordinary differential equations is considered. Necessary first-order optimality conditions are obtained.     

枣35断块沙三段玄武岩储层特征及成藏条件分析

从地质、地震、测井及试油试采等方面入手，并采用新技术，对自来屯构造枣35断块沙三段玄武岩储层特征及成藏条件进行了分析。其结果为该区下一步勘探、开发及进一步研究奠定了基础。     

An inverse solution methodology for estimating the diffusion coefficient of gases in Athabasca bitumen from pressure-decay data

An inverse solution methodology is developed for the estimation of diffusion coefficient of gases in highly viscous, oil-sands bitumens from isothermal, pressure-decay measurements. The approach involves modeling the rate of change in pressure using the diffusion equation for the liquid phase coupled with a mass balance equation for the gas phase. The inverse solution framework is utilized to arrive at two graphical techniques for estimating the diffusion coefficient. Both techniques involve the determination of the slope of a straight line resulting from plotting the experimental data in accordance with the developed model. An advantage of the proposed techniques is that the diffusion coefficient is estimated directly, i.e. without making it an adjustable parameter. The novelty of the proposed method is in its simplicity as well as its ability to isolate portions of the pressure-decay data affected by experimental fluctuations. The effect of the initial pressure on the predicted diffusion coefficient and pressure-decay profile was also investigated. The diffusion coefficients of CO₂, CH₄, C₂H₆ and N₂ in Athabasca bitumen at 50–90 °C and about 8 MPa were estimated and compared with literature values.     

地下水运动数值模拟过程中边界条件问题探讨

本文对地下水运动数值模拟过程中边界条件的涵义 和处理方法进行了分析和讨论。阐述了边界条件所包含的双重意义。指出随着人类活动影响 强度的日益增大，边界条件的处理要面临一些新的更为复杂的问题。在模型预报之前必须首 先对边界条件做出预报。边界条件的预报既要考虑自然因素的作用，同时也要考虑人类活动 (人工开采和人工补给)的影响及由于邻区水流条件变化而产生的耦合效应。之后，给出了两 个应用实例。     

青藏高原油气资源远景评价问题

位于全球特提斯巨型油气构造域东段的青藏高原是我国现今陆上面积最大、油气调查和研究程度最低的地区.尽管近些年来对青藏高原油气地质研究取得了大量成果,但是仍存在诸多尚未解决的基础地质和石油地质问题,从而影响并制约着该区油气资源远景评价.根据特提斯构造域演化、青藏高原大地构造属性、盆地基底以及新生代大陆碰撞、高原隆升对盆地的改造作用,提出了影响该区油气资源远景评价的10个重要问题,并对这些问题进行了讨论分析,指出了该区油气地质调查与远景评价中应进一步深入研究的关键问题.     

A fictitious domain decomposition method for the solution of partially axisymmetric acoustic scattering problems. Part 2: Neumann boundary conditions

We present a fictitious domain decomposition method for the fast solution of acoustic scattering problems characterized by a partially axisymmetric sound‐hard scatterer. We apply this method to the solution of a mock‐up submarine problem, and highlight its computational advantages and intrinsic parallelism. A key component of our method is an original idea for addressing a Neumann boundary condition in the general framework of a fictitious domain method. This idea is applicable to many other linear partial differential equations besides the Helmholtz equation. Copyright © 2003 John Wiley & Sons, Ltd.