查询词典 symmetry

A virus is a unit of infectious genetic material smaller than any bacteria and embodying properties placing it on the borderline between life and non-life. The vast majority of the virus capsid protein assembled into icosahedral symmetry of the structure. Caspar-Klug Theory has become a fundamental concept for the classification of icosahedral viral capsids based on the principle of quasi-equivalence.

二：病毒是比任何细菌都小的感染性遗传物质，介于生命与非生命之间的一类无细胞结构的生物，绝大多数病毒的衣壳蛋白装配成二十面体对称的结构，&准等价&原理是解决严格遵从二十面体对称性的病毒衣壳几何特征的有效而成熟的方法。

The capsids of nearly all spherical viruses adopt icosahedral symmetry .

球状病毒衣壳采用二十面体对称。

The solution of the optimal 3-impulse rendezvous is a multi-variable iteration process. For the 3-impulse rendezvous with terminal coastings, the symmetry characteristic of optimal 4-impulse rendezvous was applied to reduce the number of the iteration variables to save the calculation consumption.

三脉冲最优解的求解采用多变量迭代的方法；对于存在端点滑行段的三脉冲最优解的求解，利用四脉冲最优解的对称性，减少迭代变量的数量，降低了计算量。

In the couping solution, based on the characteristics of the models in this dissertation, each of loading step is finished in unit time. Thus the volumetric strains on the current increment step as analysis parameters are inserted into the equation of continuity and a physical equation for pore water pressure is presented. The fundamental solutions of two kinds of classic problems (axial symmetry and plane strain) are derived. By use of the fundamental solutions of pore water pressure combined with finite element method of soil mechanics, a semi-analytical and semi-numerical method for nonlinear consolidation equations is presented.

在耦合分析中，根据本文模型的特点，将每一荷载增量步看作单位时间完成，对应当前增量步的体变分量作为分析参数代入连续方程，建立了基于数值模型的孔压变化方程，根据工程中最常见的两类问题推导出基本解，结合土骨架的控制方程建立了此类液-固耦合问题的半解析半数值解答体系，编制了有限元程序，从而实现了从建立本构关系到模拟固结问题的全数值方法。

These indicate that the covalency of bond that Nd〓 forms increases and the symmetry around Nd〓 lowers, which reflects the structural variations of silica gels.

这些表明了随着温度升高样品中Nd〓形成键的共价性增加，而且Nd〓周围的对称性降低，反映了硅胶结构的变化。

Wide columns and crossbeams: It is well known that a solid gantry structure is associated with symmetry and high-speed cutting.

--超宽的立柱和横梁，大家知道龙门式的结构由于其极好的对称性和极佳的钢性被高速切削设备。

This paper explored successfully the qualitative and quantitative analysis of flow field in pipeline imposed on ultrasonic flowmeter. With the installation of the flow conditioner, the non-symmetry flow and swirl flow of disturbant factors were effectively reduced.

本论文成功的探讨管流场对超音波流量计定性与定量的影响，流场因为90度弯头、T型管、…等影响流场稳定的因素存在，若不装整流器，所产生流场的不对称性及涡漩，将会持续到43.5D以上。

Based on granular hydrodynamics,Eggers deduced a simplified flux model which has been successfully used in describing the spontaneous symmetry breaking of granular gas in the compartmentalized system,but so far has not been able to predict the oscillation phenomenon of bidisperse granular gas.

Eggers以颗粒气体动力学为基础得出了简化的理论模型。该模型可以很好地得到分仓中颗粒的布居分聚现象，然而似乎无法用于预测两种颗粒在分仓体系中的布居振荡现象。

Tested by practice, Bidirectional Symmetry mode evolutes into anew mode of Symmetrical Bidirectional Communication.

双向对称模式经过实践的检验，演变为对称双向传播新模式。

Methods:TMJs of 7 corpses were dissected and studied anatomically.The anterior inclining angle of external auditory canal was measured on 20 CT films which show the symmetry of bilateral external auditory meatus and the central position of nasal septum.

解剖测量7具国人尸体头颅的TMJ解剖结构及其与邻近解剖标志和重要神经血管的解剖关系，并依据20张显示鼻中隔居中，双侧解剖结构对称的CT片测量外耳道前倾角。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。