查询词典 geometric

This approach uses the geometric features and radiation features of the road, according to the small amount seed points given by the user, each point in the road centerline can be gotten. Then an adaptive gray template is used to adjust each point in the road centerline. Finally, least square method and Newton iteration method are adapted to each point in the road centerline to fit a polygonal line.

该方法利用道路地物的几何特征和辐射特征，根据用户提供的少量道路种子点，利用自适应灰度模板对道路中心线上的每个点进行调整，最后采用最小二乘算法和牛顿迭代法对调整后的道路中心线上的每个点进行拟合，以此获得趋近于道路中心线的最佳折线。

Check content covered the aspect of almost full knowledge of series, if tried check of the 11st problem 2004 of series connect with knowledge of sue for peace, the 2 content check that try the 2nd big problem to combine analytic geometry, inequality of recurrence series, monotonicity and;2005 of knowledge of sue for peace year try the 7th problem to combine polynomial coefficient check knowledge of geometric series sue for peace, the 13rd problem is background check with recurrence series the preliminary knowledge; of the property that series concerns and number theory

考查内容涵盖了数列的几乎全部知识点，如2004年一试第11题考查了数列的通项和求和知识，二试第2大题结合解析几何、不等式的内容考查了递推数列的通项、单调性及求和知识；2005年一试第7题结合多项式系数考查了等比数列求和知识，第13题以递推数列为背景考查了数列有关的性质和数论的初步知识

Within algebraic geometry is the description of geometric objects as solution sets of polynomial equations, combining the concepts of quantity and space, and also the study of topological groups , which combine structure and space.

在代数几何里，把几何对象描述成多项式方程的解集，结合数量和空间的概念；也研究拓扑群，结合了结构和空间。

Adopt UG software to create the entity about the geometric modeling, through seting the NC parameter. After postposition dispose, gain the NC program and entity model.

利用UG NX软件进行实体生成，经过数控加工编程和刀具文件的后处理最终形成可以加工的实体模型。

Geometric parameters are repeatedly modified in accordance with preconcerted system performance and prospective target; finally achieve perfect dynamic response performance.

根据预定的系统性能和预期的目标反复修正几何参数，最终达到预期的动态响应性能，为先导阀的设计开辟了一条新的思路。

The techniques for prefabrication and assembling of short box-beams based on the geometric control method are still in the beginning stage in our country.

基于几何控制法的箱梁短线预制拼装技术，在我国尚处于起步阶段。

For example, quadratic curve and quadric surface are used as primitive element in most modeling/CAD system. The implicit formulae for computing the intrinsic geometric invariant??

随着对参数曲线曲面研究的深入，早在80年代初苏步青教授等就将几何不变量的研究引入并应用到参数曲线、曲面的研究中，取得了重要的成果［1？

The following works have been fulfilled within this thesis: First of all, based on the general principle of virtual displacement of nonlinear continuum mechanics, the geometric and material stiffness matrices is presented, several examples show that both of them can give out accurate result.

其次，通过对交错桁架结构的一些算例对比，得到了该结构一些带规律性的结论，这是国内首次对交错桁架体系进行空间三维的弹塑性全过程分析。

In this topic, the dynamic analysis methods for piezoelectric vibrator are studied systematically based on the theoretical model, FEM numerical experimentation and FEM governing equation for given compound-mode vibrator, and some valuable conclusions are obtained. The main work accomplished is summarized as follows: 1.Elaborate the main modeling methods for piezoelectric vibrator and the significance and necessity to study the dynamic characteristics of piezoelectric vibrator which emphasize the urgency of this paper. 2.Take the bending deformation induced by piezoelectric ceramic as example, the energy transfer mechanism of electric energy to mechanical energy are analyzed; the motion and force transfer mechanism are analyzed for the longitudinal-bending vibrator. 3.Based on mode assumption and Hamilton principle, the coupling model of piezoelectric vibrator of linear USM is built; moreover, the equivalent circuit model is obtained and a coupling equation represents the relation between electric parameters and mechanical parameters is derived which provides foundation to match the vibrator and driving circuit. 4.Combine the constitutive equation of piezoelectric ceramic with elastic-dynamical equation, geometric equation in force field and the Maxwell equation in electric field and the corresponding boundary condition equation, the FEM control equation for piezoelectric vibrator of USM to solve dynamic electro-mechanical coupling field is established by employing the principle of virtual displacement. The equation lays the foundation to study the non-linear constitutive equation of piezoelectric ceramic driven by high-power. 5.Define the dynamic indexes of characteristic of vibrator and carry out variable parameters simulation by calculating the model parameters and the electric characteristics of vibrator are simulated according to the equivalent circuit model. By numerical experimentation, the working mode of vibration of vibrator and the shock excitation results of the working frequency band which provides the mode frequency to realize bimodal are analyzed. Detailed calculation of the electro-mechanical coupling field parameters is made by programming the FEM control equation.

本课题从理论模型、有限元数值试验、有限元控制模型等方面以复合振动模式振子为例对超声电机压电振子的动力学特性及其分析方法进行了全面系统地研究，得出了许多有价值的结论，主要概括如下： 1、阐述了目前针对超声电机压电振子的主要建模方法，对压电振子动态特性的研究意义和必要性进行了论述，突出了本文研究内容的迫切性； 2、以压电陶瓷诱发弹性体发生弯曲变形为例，分析了压电陶瓷通过诱发应变来实现机电能量转换的机理；对基于纵弯模式的压电振子的运动及动力传递机理进行了分析； 3、基于模态假定，利用分析动力学的Hamilton原理，建立了面向直线超声电机压电振子的机电耦合动力学模型，并据此建立了压电振子的等效电路模型，导出了电参量与动力学特性参量的耦合方程，为压电振子与驱动电路的匹配提供了依据； 4、从压电陶瓷的本构方程出发，综合力场的弹性动力学方程、几何方程、电场的麦克斯韦方程以及相应的边界条件方程，采用虚位移原理，建立了压电振子动态问题机电耦合场求解的有限元控制方程，为研究其大功率驱动下的非线性本构模型奠定了基础； 5、界定压电振子的动力学特性指标，对压电振子的机电耦合动力学模型参数进行计算及变参数仿真；依据等效电路模型，对压电振子的电学特性进行了仿真分析；通过有限元数值实验，对压电振子工作模态附近的模态振型及工作频率附近的频段进行了激振效果分析，找出了实现模态简并的激振频率；利用有限元控制方程，通过编程计算，对压电振子的力电耦合场参数进行了详细计算，得出了一些有价值的结论。

The average configuration of each group was generated by the Procrustes analysis. These configurations were employed for geometric morphometry: finite-element method and thin-plate spline analysis.

将普式叠合分析法求得的各组平均图形，进行之后有限元素分析、和薄板仿样分析（Thin-plate spline analysis）的运算。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。