查询词典 finite dimensional

Using the relations between Hermite and Laguerre-Gaussian modes and expanding the window function of two-dimensional rectangular hard-edged apertures into a finite sum of complex Gaussian functions, the propagation of complex- argument Laguerre-Gaussian beams through a paraxial optical ABCD system with a rectangular hard-edged aperture is studied. An analytical propagation equation is derived and used to study the diffraction at the rectangular hard-edged aperture and the focusing properties of complex-argument LG beams.

利用拉盖尔－高斯模和厄米－高斯模的变换公式，并使用将二维矩孔光阑窗口函数展开为有限个复高斯函数之和的方法，得到了复宗量拉盖尔－高斯光束通过含矩形硬边光阑近轴ABCD光学系统的变换的解析传输公式，并对复宗量LG光束通过矩形硬边光阑的衍射和聚焦特性进行了研究。

Objective: To develop and validate an accurate three-dimensional geometrical and mechanical finite element model of the lumbar L4-L5 segment using a new computer-aided designing method.

目的：采用一种新型计算机辅助设计方法精确建立腰椎L4~L5节段三维非线性有限元模型并进行充分验证。

The protrutive relation was set to reestablished the articulation. The geometry model constructed in CAD software was put into MSC.PATRAN to set the concrete Three-dimensional Finite Element Model. Result revealed (1) Tensile stress distributed in the posterior-upper area; molar area.(2) Compressive stress distributed in the opsile molar area and gonion area .

本研究通过模拟下颌前伸时，对下颌骨骨组织应力变化进行三维有限元分析[3 ，8] ，了解下颌骨骨组织应力分布特点，为临床矫形治疗提供理论依据。1 材料与方法1.1 建立几何模型1.1.1 病例选择选择一名年龄 12岁的男孩，X线手腕骨片显示处于生长发育高峰前期，全身发育正常。

Physical model of three-dimensional half axis rotor of 110 MW air inner-cooled turbo-generator was established, which included the rotor end, axial ventilation ducts and sub slot ventilation ducts. The rotating turbulence flow field was simulated numerically based on the finite volume method. The air velocity and flow rate distribution characteristics of the rotor end, axial ventilation ducts and sub slot ventilation ducts were analyzed.

建立110 MW空内冷汽轮发电机转子冷却通风道一个槽(包括端部、轴径向及副槽)的半轴向段三维物理模型，并基于有限体积法对该物理模型进行旋转湍流流场数值模拟，分析了端部、轴向段和副槽通风段的空气速度、流量分布特点。

Explore and improve the method of performing biomechanics experiment with digitalization mechanics model. 1、Construct 3D finite element model of normal acetabulum: Scan the pelvic example of human body with CT, restitution three-dimensional visible haunch bone with correlated software; investigate the method of 3D image reconstruction with plane images.

正常髋臼三维有限元模型的构建：通过对大体标本进行薄层CT扫描，利用相关软件重建三维可视髋臼，研究利用平面图像重建高仿真三维影像的方法；再利用有限元分析软件将髋臼力学参数赋值于可视模型上，使其具备力学性能，同时研究如何改进赋值方法，使有限元模型力学性能更接近于大体标本。

Objective To construct a three-dimensional finite element analysis model of the first mandibular molar with hemisection prosthodontic therapy.

目的：建立下颌第一磨牙半切术的三维有限元模型。

DESIGN: To construct the three-dimensional finite element model of the fracture of humerus with different loading manners.

设计：进行不同应力加载的条件下，构建肱骨骨折的三维有限元模型。

The main of this design to design of automatic hydraulic press design and its three-dimensional model, the choice of the finite element analysis of beams.

本设计主要设计全自动液压压机的设计和其三维模型的建立，选择上横梁进行有限元分析。

The solution to the one dimensional hyperbolic runoff equations and sediment equation are obtained respectively by using the characteristics method and finite difference method.

利用水力学原理建立了坡面降雨径流和土壤侵蚀模型，分别采用特征线法和有限差分法对径流量和土壤侵蚀量进行了求解，并针对具体降雨事件进行了模拟计算，计算结果与试验小区实测值基本一致。

The initial-boundary value problem for hyperbolic equation in one-dimensional domain with moving boundary is studied. The discrete time finite element approximation is suggested, and its stability is proved.

研究了具有变动边界的一维区域上的双曲型方程的初边值问题；提出一类全离散有限元逼近格式，并证明了格式的稳定性。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。