查询词典 isotropic

New boundary integral equations for the torsion problem of an isotropic bar with curvilinear cracks are derived by using integration by parts and other techniques to the traditional boundary integral formulations. And the boundary integral equations for the torsion problem of an anisotropic bar with curvilinear cracks are also derived by using the isotropicalized boundary element method. Then the anisotropic problem can be solved on the base of the boundary element method of isotropic problem.

然后用各向同性化方法，将各向异性材料裂纹柱体的扭转问题转化为各向同性材料的问题，在各向同性材料裂纹柱体扭转问题的新的边界积分方程的基础上，推导出了适用于各向异性材料裂纹柱体扭转问题的边界积分方程，然后按已推导出的各向同性问题的边界元法求解。

Based upon the general equations of a trans-versely isotropic foundation, the stress functions and the theory of Fourier transforms , the basie displacement so-lutions for a transversely isotropic body under horizontal concentrated loads are obtained.

根据横观各向同性体的基本方程，运用应力函数、傅氏变换和傅氏逆变换理论，得出了横观各向同性地基在水平集中荷载作用下的基本位移解，然后利用积分的方法分别得出了横观各向同性地基在条形面积上水平均布荷载、水平三角形分布荷载及水平梯形分布荷载的位移计算公式，并利用实测的一组弹性参数，将横观各向同性地基中的相对位移与现有的计算理论给出的各向同性地基中的相对位移通过图形作了分析比较，得出了一些有益的结论，以供岩土工程设计人员参考。

objective to obtain the diffusion tensor maps of the normal human brain,and assess intrinstic properties of water diffusion in quantitative parameters for an anatomic analysis.methods maps of isotropic apparent diffusion coefficient and various anisotropic maps were calculated in60healthy adults from seven diffusion imagings by using single-shot echo-planar diffusion-weighted sequence.brain parenchyma anatomy was analyzed and adciso and various anisotropic index were measured.results （1）diffusion properties of different tissues and anatomic areas of normal adult human brain are different.diffusion in white matter is anisotropic;diffusion in gray matter is isotropic.

目的 获取正常人脑组织扩散张力性图像（diffusion densor imaging，dti），定量分析正常人脑组织水扩散的内在特性，进一步评价脑解剖结构。方法 60例健康正常人，应用单次激发epi-dw序列，计算出adciso图及各向异性图，分析脑实质不同区域的解剖结构，测量adciso（isotropic apparent diffusion coefficient）及各向异性指数。结果（1）脑内不同组织结构弥散特性不同，脑白质弥散表现为各向异性，而脑灰质弥散表现为各向同性。

Adopting the Biot's wave equation of transversely isotropic saturated soils and taking the influence of the frequencyon on the viscous coupling effect between the solid and liquid media into account, the reflection on the half-space surface of transversely isotropic saturated soil is studied. It challenges traditional view of only considering low frequency couple effect in saturated soils.

采用横观各向同性饱和土体的Biot波动方程，考虑频率对固液两相粘滞耦合作用的影响，深入研究了弹性波在横观各向同性饱和土体半空间的反射，克服了以往饱和土体仅考虑低频耦合作用的做法。

Performance of dual-polarization SARs to distinguish three basic scattering mechanisms from an isotropic surface, a dipole, and an isotropic dihedral is studied theoretically. Performance of dual-polarization SARs to identify the eight scattering mechanisms inside the feasible region in H-αplane is analyzed, and a feasible division of H-αplane for HH-VV dual-polarization SAR is obtained in an experimental manner.

推导了双极化H-α平面有效区域的边界，从理论角度研究了双极化SAR对各向同性表面、偶极子和各向同性二面角三种基本散射的识别能力，通过实验分析了双极化SAR对H-α平面有效区域内八种基本散射机理的识别性能，并给出了HH-VV双极化H-α平面的一种可行划分方式。

In the paper, the relation between stress and strain of transverse isotropic material and isotropic material is deduced.

用对张量函数求导的方法导出了横观各向同性材料和各向同性材料的应力应变关系式的一般形式。

"Isotropic",In an isotropic material, material properties such as the modulus of elasticity.

"，"等向性的材料特性例如弹性的模式"，，"isotropic的中文意思为均质六面体方格等向性

The article analyses angle distribution of radiant energy flow density and angle distribution of radiant power when an electric dipole is oscillating along polar axis in magnetic anisotropic medium,also compares them with the expression of that in isotropic medium;thereby,a theoretical basis for more effectly using electric isotropic and magnetic anisotropic medium is obtained.

分析振荡电偶极子在各向异性磁媒质中沿极轴振荡时其辐射能流密度的角分布和辐射功率的角分布情况，并与各向同性媒质中振荡电偶极子沿极轴振荡时辐射能流密度的角分布和辐射功率的角分布情况进行对比，得出更有效地利用电各向同性磁各向异性媒质的理论依据。y

Each non-isotropic engagement member (56) has a stem portion (58), and a securement element (60) which is non-isotropically disposed at a distal end region of its corresponding stem portion (58) to provide a non-isotropic engagement opening.

每个非各向同性接合件(56)具有杆部分(58)，和在其相应的杆部分(58)的远端部设置的固定元件(60)，以提供非各向同性接合开口。

Liquid crystal is a kind of instar matter between completeness inerratic crystal and isotropic liquid. Its characters are between the solid crystal and the isotropic liquid.

液晶是介于完全规则的晶体和各向同性的液体之间中间态的一种物质，其特性与结构介于固态晶体与各向同性液体之间。

Finally it offers the analysis of the fault-tolerance system as well as its test verification.

这样，运行于空间环境中的系统的设计目标就是在保证系统实时性

However, it is still difficult to find out the real reason of the increase of the keratinized gingiva during the orthodontic extrusion whether it is due to the proliferation of the gingival tissue or to its elastic nature, that is because the proliferation of the fibroblasts as well as the connective tissue changes in volume and the intra-fibers spaces were all immeasurable in most of the studies.

然而，仍然难以找到真正的原因增加的角化牙龈在正畸挤压它是否是由于扩散的牙龈组织或其弹性性质，这是因为增殖的成纤维细胞以及作为结缔组织的变化量和内部纤维空格都是不可估量的，大多数的研究。