查询词典 developable surface

This paper analyzes the surface tension and specific surface free energy of liquid and discusses their microstructure mechanism.

对液体的表面张力和比表面自由能进行了热力学分析和比较，探讨了液体的表面张力和比表面自由能两个概念的各自内涵和在分子水平上的产生机理。

Explain that fracture energy and strength decrease from the viewpoint of surface energy and surface tension.

从表面能及表面张力的观点分析了断裂能和强度降低的原因。

Similar to surface tension, adsorption is a consequence of surface energy.

类似于表面张力、吸附的表面能量。

The results show that rutile TiO_2 surface is the lowest energy surface.

计算结果表明(110)晶面为最低能量面。

And two models of single channel are also developed, one is formed by ruled-surface impeller, and the other is formed by enveloping surface impeller.

然后在专门的网格划分软件Gambit中对两个整体风机三维流场模型和两个单叶轮通道的流场模型进行网格划分及边界条件设置。

Based on the CAD software UG, the models of centrifugal fans with ruled-surface impeller versus with enveloping surface impeller are developed.

首先本文采用CAD软件UG对直纹面叶轮离心通风机和包络面叶轮离心通风机进行了整体风机三维流场建模和单个叶轮通道的流场建模。

The main tops of research and creative points of the dissertation are as follows: The gear surface equations are deduced strictly from the space meshing analysis of planar enveloping hourglass meshing surface.

主要研究工作及创新点如下：论文在对平面包络啮合成型运动进行空间啮合分析的基础上，进行了平面包络环面蜗轮副啮合齿面方程的严格推导，进行工具母面坐标系的统一化处理，并利用计算机技术，对平面包络环面蜗轮副啮合型面进行整体理论实体造型，建立了啮合型面的网格化整体理论模型。

By using the CFD software FLUENT, the inner-flow field of centrifugal fans with ruled-surface impeller versus with enveloping surface impeller has been simulated. The static pressure distribution, the dynamic pressure distribution, the total pressure distribution, the turbulent intensity and the speed vector of the two kinds of centrifugal fans are then analyzed and compared. From the calculating results, we found that the pressure distribution, the speed vector and other parameters of the two kinds of centrifugal fans are basically same. This implies that the tool-path generating arithmetic for the machining of the impeller can meet the aerodynamic requirements of the centrifugal fan. Furthermore the method can provide proof for designing department to establish sound manufacturing tolerance for impeller.

最后采用CFD软件FLUENT，利用标准k-ε湍流模型，采用分离隐式求解器，分别对直纹面叶轮离心通风机和包络面叶轮离心通风机整体风机内部三维流场和单个通道流场进行了数值模拟计算，在计算结果的后处理中，对相同坐标值处的静压力、动压力、湍流强度和速度矢量等参数进行了分析与比较，结果表明：在相同的计算参数条件下所得到直纹面叶轮离心通风机和包络面叶轮离心通风机内部流场差别不大，从而揭示所采用的叶轮数控加工的刀位规划方法的规划误差对流体机械动力性能的影响不大，这也为设计部门制定合理的叶轮加工公差提供了依据。

Based on the thermodynamic analysis of heat transfer process between water jet and the blade surface, the differential equations of heat convection and differential equation of steady heat conduction between water jet and the blade surface are established. Power expression of heat exchange and temperature field expression of the blade are derived.

根据对水射流与刀片间传热过程的热力学分析分别建立了水射流与刀片表面对流换热微分方程组和热源与刀片间的稳态导热微分方程，推导出水射流对刀片的换热功率表达式和刀片内温度场表达式。

So the return is realized from equidistant surface to real measurement surface.

针对不同的二次曲面本文提出了不同的误差评定方法。

The dissecting of samples in group2 were difficult. The root of pulmonary artery and ascending aorta failed to be unfolded because fibrous tissue was tough, right and left fibrous trigone were too firm to be solved by hand. Cardiac muscle fibers couldn't be stripped along myofibrillar trajectory since they were prone to break because of their friability.

组2的心脏解剖困难，表现为纤维组织坚韧，游离肺动脉非常困难；徒手无法松解左、右纤维三角，肺动脉和主动脉根部的游离非常困难；心肌纤维坚硬、质脆，解剖时容易断离成碎块，无法沿纤维走行方向剥离。

We have battled against the odds in a province that has become increasingly violent.

我们对在一个争夺日益激烈省的可能性。