动力分析的刚体—界面元与有限元耦合法

提出了刚体－界面元、有限元与半无限元相耦合的算法，研究了挡水结构系统的动力特性及在地震激励下的动力响应，对于结构的主要部分用刚体－界面元离散，对结构的迎水面部分用有限元离散，在两种单元的交换面上设置了过渡单元，采用有限元和半元限元相结合模拟了水体的宽广性，文中导出了相关公式，编制了相应的计算程序，数值算例结果与有关文献比较，证实了提供方法和编程序的正确性，并说明该方法具有简便，工作量少和计算精度高     

钢-铝固液相复合板界面层厚度建模

采用人工神经网络方法建立了钢－铝固液相复合中助焊剂质量分数,铝液温度,模具温度,压力与界面层厚度间的关系型,并结合最大剪切强度的复合工艺参数得出了钢－铝固液相压力复合的最佳界面界厚度的１０．０μｍ。     

Connecting Conditions and Constraint Equations in Applied Science

IntroductionIn applied science , e . g . machinery , vibrationmechanics , fluid mechanics , and management science , toobtain the opti mal solution of some issues , the objectfunction is usually shown since the abstract mathematicsmodel is set , and all kinds of boundary conditions andconnecting conditions or constraint conditions are putforward . Above these conditions are shown with the shapesof constraint equations . For example ,in machinery opti maldesign, to get the opti mal solution of …     

中性载体DAM推动Ca^2＋离子在水／硝基苯界面的转移

本文用卷积(半微分和半积分)循环伏安法研究了中性载体DAM(二安替比林甲烷)络合推动Ca~(2 )离子在水/硝基苯界面的转移过程,探讨了有关转移过程的机理,测定了相应的扩散系数和配合物的络合稳定常数。     

断裂理论研究的若干进展

本文扼要介绍了断裂理论研究方面的最新进展。包括以考虑应力的三轴度发展起来的K—T和J—Q理论;界面断裂力学的研究;断裂理论的增韧研究,以及应用分形理论的一些研究成果,力图阐述一些新的概念、新的思想和新的方法。并对今后的研究方向提出了作者的看法。     

断陷湖盆层序界面的成因类型及其与油气藏的关系

利用湖盆沉积作用基本方程,对断陷湖盆层序界面的成因机制进行了研究,并对东营凹陷的断陷湖盆进行了实例分析。结果表明,气候变化和构造运动是层序界面形成的关键因素。按照成因机制,东营凹陷沙河街组的层序界面可分为构造型(T型)和构造气候综合型(Tc型)。T型界面一般对应于三级层序界面,且根据沉积物的供给特征可进一步分为3种类型;Tc型界面一般对应于二级或一级层序界面。不同成因机制的层序界面具有不同的结构特征和地层分布模式,砂体和油气的富集程度与界面的成因类型存在着密切的关系。Tc型界面附近砂体发育,砂体成藏率低;T型界面附近砂体发育程度低,砂体成藏率高。     

Fingerprint representation methods based on B-Spline functions

The global characteristics of a fingerprint image such as the ridge shape and ridge topology are often ignored in most automatic fingerprint verification system.In this paper,a new representative method based on B-Spline curve is proposed to address this problem.The resultant B-Spline curves can represent the global characteristics completely and the curves are analyzable and precise.An algorithm is also proposed to extract the curves from the fingerprint image.In addition to preserve the most information of the fingerprint image,the knot-points number of the B-Spline curve is reduced to minimum in this algorithm. At the same time,the influence of the fingerprint image noise is discussed.In the end,an example is given to demonstrate the effectiveness of the representation method.     

FDTD modeling of transient scattering by subsurface targets

In this paper, a two-dimensional (2-D) finitedifference time-domain method (FDTD) scheme is used to simulate the transient scattering characteristics of buried objects, which are modeled by columns of arbitrary permittivities, conductivities, and sizes. The FDTD soil is modeled by isotropic, homogeneous and lossy media. The standing-traveling wave boundary condition (STWBC) that can simplify calculation and save CPU storage is used for modeling physical absorbers inside the FDTD computational dornairL Reflection of electromagnetic pulses incident on a layered medium and transient scattering by the ground and an underground airsqu are cylinder are computed. These results verify the validity of the FDTD scheme by comparisons with those shown in some references. Numerical results presented in the final part of this paper are desirable and meaningful, explicitly distinguishing echo waves stemming from the ground and the buried ohjects.     

嵌段共聚水溶性高分子在空气/水界面吸附态的构象

对于用几种不同疏水／亲水单体比合成的聚(丙烯酸丁酯／丙烯酸)共聚物样品测定了其水溶液的表面张力,运用Gibbs吸附方程求得在样品溶液临界胶束浓度时样品在气／液界面的分子吸附面积,以此推测其吸附态构象。结果表明,亲水单体单元在共聚物中含量多时,样品分子趋于在水中溶解;疏水单体单元多时,样品分子趋于在表面吸附。其吸附态构象为分子链上相邻的数个丁酯侧基吸附于水面,形成“薄煎饼状”疏水微区。     

带牛曼边值条件的半线性椭圆型方程正解的存在性

考试方程Δｕ＋λｕＮ＋２／Ｎ－２＝０在牛曼边值条件ＤｒＵ＋ａ（ｘ）ｕ＝μｕ＾Ｎ／（Ｎ－２）下的一个正解的存在性。