查询词典 volume element

A high accuracy finite volume element method was given based on cubic spline interpolation for linear and nonlinear twopoint boundary value problems of ordinary differential equations. The computational scheme was derived and the property of positive type was discussed. Further we presented the convergence analysis and the scheme was proved having fourth order error estimate in discrete energy norm.

针对常微分方程线性和非线性两点边值问题，提出了基于三次样条插值的高精度有限体积元方法，给出了具体计算格式，讨论了格式所具有的优良性质--正型性，并应用能量方法给出了收敛性分析，证明了格式按照离散能量模具有四阶精度。

Secondly, based on the theory of stability, the author proposes a new concept concerning the failure criteria as a solution to eliminate these inconveniences whereby the definitions of failure criteria of the infinitesimal volume element of material, the cross section of member, the single member and the aggregate of members are given. Finally, the parameters to represent the degree of failure of the objects and the subspace generated by the failure modes are discussed.

然后笔者在稳定性的意义上提出了一个新的破坏准则的概念，并在此基础上分别给出了针对材料微元、构件截面、单个构件和构件集合的"破坏"的定义，接着进一步定义和讨论了研究对象的"破坏程度参数"和"破坏模式子空间"。

And the strain and curvature of the volume element geometrical mid?

同时假设代表性体积单元具有均匀的中面应变和曲率。

The strain and curvature of the volume element geometrical mid-plane is assumed to be uniform.

同时假设代表性体积单元具有均匀的中面应变和曲率。

In this paper, theory of homogenization was introduced into the calculation of plasterboard filled with concrete and Representative Volume Element model of plasterboard filled with concrete was established.

本文将均质化理论引入灌芯混凝土石膏板的计算，建立了灌芯混凝土石膏板的代表性体积单元模型，应用有限元分析程序ANSYS对此RVE模型进行模拟，获得其等效弹性常数，为结构的有限元计算提供了有效途经。

A conservative form for the flow equation is established by using upwind finite volume element method.

考察非饱和水流问题的模型方程，利用线性迎风有限体积元方法建立非饱和流动的守恒形式，并获得该方法形式为O的误差估计，最后给出数值模拟。

The results were found as following:(1) The damage value increases more significantly with the increase in PVF before 30% PVF, beyond which the increasing trend becomes gradually gentle.(2)Keeping the interphase strength and PVF unchanged, the damage increase with increasing moisture concentration in a nearly linear relation.(3)The results generated from the FCC model with consideration of the interphase debonding are in good agreement with the experimental data, meanwhile, the FCC model is also capable of predicting the critical load for the damaged and the undamaged dental composite subject too the 3-point flexural test.4 A 3D-fmite element analysis has been successfully exploited to examine the mechanical behavior of the restoration-tooth structure under the polymerization shrinkage and water sorption. It was found:(1) The low stiffness of the composite has the effect to limit the displacement occurring in the remaining tooth tissue. For lower interphase, the cuspal flexures are litter higher. The high interphase modulus acts as a \'shielding effect\' for stress transfer.

得到如下结论：(1)相同的吸湿性，在30％PVF(颗粒体积分数：Particle volume fraction，PVF)前增加PVF，层间脱胶损伤值显著增加；此后损伤值的增加趋于平缓；(2)保持层间强度和PVF不变，层间脱胶损伤随吸湿率的增加而接近线性增加；(3)FCC(面心立方：Face-centred cubic，FCC)模型层间脱胶损伤的预测结果和实验数据基本吻合；同时此模型可以用于预测牙齿填充材料三点弯曲实验的临界载荷。4、建立理想牙齿修复结构，利用有限元方法研究了同时考虑聚合收缩和吸湿膨胀耦合作用下的填充修复材料和粘结界面层材料性能对牙齿修复结构的力学行为的影响，得到如下结论：(1)低弹性模量的牙齿填充修复材料能限制天然牙组织的位移，但天然牙组织的位移与粘结界面层的弹性模量无关。

The silhouette of object on the turnable stage has been observed from multiple views through rotating. A bright background has been used to improve the contrast of images. An acquiring and processing system has been built. The 3D reconstruction algorithm has been studied based on Shape from Silhouette, and a 3D octree volume element structure model has been achieved through refining. The data will be used in 3D model repairing of laser scanning method.

本文采用单个固定CCD摄像机与转台相配合的方式，实现对物体轮廓图像的多角度采集，并使用背景照明来增加轮廓的清晰度，建立了一套自动的多视角轮廓3D测量系统，通过逐级细化的方式获得物体八叉树体元结构的三维模型，用于激光扫描法的数据修补。

Basesd on typical volume element of one-fiber short column, a new analytical model is established in this thesis.

本文根据单一纤维短圆柱的典型体积单元建立了一个新的分析模型。

Based on Fermat's principle, the paper uses full-path iterative algorithm to realize 3-D VSP two-point ray tracing in volume element model.

本文基于费马原理，利用全路径迭代算法实现体元模型中的三维VSP两点射线追踪。

He knows that he's one of the mostdominant players in the NBA right now.

我知道他现在是联盟里最有统治力的球员之一了。

Using analysis method of BCG , the dissertation analyzed the management of voluntary service organizations .

利用BCG分析方法对我国的志愿服务组织管理进行了分析。