拓扑结构

In allusion to the existing problems in bridge structure optimization design,an optimality criteria method for topology optimization of continuous structures based on solid isotropic material with penalization is proposed.

针对桥梁结构优化设计中存在的问题，而提出的一种基于密度惩罚法的连续体结构拓扑优化问题的优化准则算法，经Matlab实例试算表明，可得到满意的优化结果，因而具有一定的应用推广价值。

In order to efficiently handle multi-constraints, a vector function inner product is defined in the zero level set and a gradient projection method is constructed, and the necessary condition satisfied by the optimal solution is proved.

在这些研究的基础上，提出了适用于一般目标函数、多材料、多约束和多载荷工况的结构拓扑优化的水平集算法4.1，并给出了刚性结构、柔性机构和复合材料微结构设计算法5.1、6.1和7.1，以及大量的数值算例。

The concise view leads to reclassification of protein structures.

本文致力于比较蛋白质主链的β-折叠片拓扑，识别侧链的组合，并将结构的运动性引入二级结构和构象，且用智能高分子催化剂来模拟酶活性部位的涨落。

Rong proposed an improved level set method for topology optimization of continuum structures.

为了解决上述问题和克服水平集方法不能在结构内产生新孔洞的困难，提出了一种基于结构拓扑随机变异的水平集优化方法。

In this paper,a novel shortest path algorithm based on the famous half-edge structure is introduced.

在分析传统最短路径算法数据结构的基础上，提出并实现了一种以半边数据结构存储网络拓扑数据的最短路径算法。

Based on the molecular topological theory, a modified group dyeing indexL is introduced. It is used in the study of refractive index of the ketones and ethers. Relationship between the refractive index and molecular structure of 57 ketones and ethers is studied by using quantitative structure-property relationship technique. The reasonable molecular modeling equations are obtained by multiple regression for the prediction of the refractive index of ketones and ethers.

在分子拓扑理论的基础上，提出了一个修正的基团染色指数L，运用定量结构－性质相关技术研究了57种酮类和醚类化合物分子的折射率与分子结构间的定量关系；通过多元回归的方法建立了L与折射率的定量结构－性质相关模型。

Topological optimization of continuum structure based on probability is a new important task in the field of engineering research today.

基于概率的连续体结构的拓扑优化设计是目前结构工程研究领域中的一个重要的崭新课题。

Considering its complex geometric topology, multi states of self-equilibrium stress and modes of inextensional mechanisms, a prestress optimization strategy was proposed to solve the final feasible prestress distribution problem of the structures with multi states of self- equilibrium stress, where the decomposition and assembly method of modal matrix, the theory of structural equilibrium matrix and the singular value decomposition method were utilized.

考虑该结构几何拓扑复杂、多自应力模态与机构位移模态的特点，应用平衡矩阵理论与奇异值分解算法，通过模态矩阵的分解组合方法，给出一种具有一定普遍意义的预应力优化策略，使多自应力模态结构体系的最终可行预应力分布求解得以简便的实现。

First, ab initio calculations have been performed at the HF/6-31G level of theory for 27 indazolyl urea compounds (using 1H-indazole tautomeric form). On the basis of optimized structures, five kinds of topological indices, electrostatic potentials as well as their statistically-drived quantities have been obtained.

首先，采用1H-吲唑异构形式，对27个TRPV1通道拮抗剂分子进行了HF/6-31G水平上的结构优化，在优化结构上进行了5类拓扑指数和分子静电势及其导出参数的计算。

Recently, topology optimization is the most challenging and hot, as well as difficult research topic in structure optimization.

拓扑优化是近年来结构优化研究领域中的前沿课题和热点问题，也是结构优化中的重点和难点。

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。