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Since a proposed application of Dirac structures is to the reduction of some mechanical systems, the reduction of Dirac structures is considered in detail in this paper, without using the existence of momentum mappings or the introducing of the notion of admissible function, etc..

因为引入Dirac结构的—个基本目的即应用于一些力学系统的约化，本文详细地讨论了Dirac结构的约化问题，包括其在Poisson流形以及Jacobi流形等的约化中的重要应用，重点利用了Dirac结构的特征对以及对偶特征对的工具，从而避开了讨论矩映射的存在性以及容许函数等一些复杂概念的介入。

To avoid the influence of ammonolysis, alcoholysis and hydrolysis on molecular structure identification, in this paper, derivational estimation is utilized to confirm molecular structures ofβ-naphthol-containing sulfonyl chloride intermediates. Then the structures of corresponding sulfonamide dyes are also confirmed by FTIR,~1H NMR and mass spectrometry.

为了避免磺酰氯化合物发生水解、醇解和胺解等衍生化反应影响磺酰氯化合物分子结构表征，本文采用衍生化反推法证明了β-萘酚结构磺酰氯化合物的分子结构，并利用红外光谱、核磁共振氢谱、质谱表征了含β-萘酚结构磺酰胺染料的分子结构。

The relationship between inter-story torsion angle and torsion deformation ratio is deduced base on the rule of irregular plan structures in China tall building technical specification. Considering the inter-story ratio limitation of different performance levels under different earthquake hazard levels, a series of torsion angle demand curves are established and a new method named as Torsion Angle Capacity Spectrum is put forward for the PBSD of irregular plan frame structures.

从现行规范对平面不规则结构的限制条件出发，推导出了结构层间扭转角与扭转位移比的关系式，结合框架结构在不同性能水平下的层间侧移角限值，建立了平面不规则框架结构在不同地震作用水平下的扭转角需求曲线，提出了扭转角能力谱法。

Some typical structures of titanium nanowires , i.e. four-strands helical, centered pentagonal, hexagonal and the thicker hexagonal structures are chosen to study the structural and size effects of ultrathin nanowires. The angular correlation functions and vibrational properties are discussed.

我们选择不同的结构和生长序列的几个典型的超细钛纳米线，即四边形、五边形和六边形序列，以及六边形序列的两个较大体系，以分别考察结构和尺寸效应。

BRICKWORK_STRUCTURES_DESC;Vaults and cylindrical structures used in medieval churches needed this technique of bricklaying to form its structures without angularity.

中世纪不带棱角的拱顶和圆柱建筑需要这种砌砖技术。

We find in form, the surface parts which are put in front of the time marks of the two structures are antithetic of affirmation and negation; in content, these two structures fully show their complementary distributions with their process meaning and critical meaning. And the essence of the complementary distributions is the contradiction of one-way dimension of objective time and inverse subjective thought.

从形式上看，在"没有VP之前"与"VP之前"结构的时间标记之前的表层成分是否定和肯定的对立；从内容上看，尽显"没有VP之前"与"VP之前"各自独立品格的是过程意义与临界意义的互补分布。

Base on the study about precious metal mineralization and ore-controlling structures , it is realized that ductile shear zones, especially those developed in the Archean granite-greenstone belt, are the most important ore-controlling structures .

国内外贵金属与控矿构造研究表明，韧性剪切带，特别是发育在太古宙古老陆核花岗—绿岩地体中的韧性剪切带是最重要的控矿构造。

Based on the Reynolds stress model CFD numerical simulation method, the experimental study of the inflow field and separation feature of nine forms of entrance structures of the oil-water separation hydrocyclone including vortex curved entrance and Archimedes spiral entrance is carried out and four kinds of ideal optimized entrance structures are obtained.

采用雷诺应力模型CFD数值模拟方法，对涡线形曲面入口、阿基米德螺旋线形入口等9种油水旋流分离器入口结构形式的内流场和分离特性进行了试验研究，得出比较理想的4种优化入口结构形式。

Additionally, as to the comparison of protein structures,we propose a "symbol assignment" approach,which can translate protein structures into symbol sequences.

另外，对于蛋白质结构的比较，我们提出了一种"符号化指派"的方法，可将蛋白质结构的比较转换为符号序列的比较。

In this thesis, CAD formulas are obtained by synthetic asymptote for three structures, from simple to complicate. The top layer is assumed very thin for all three structures.

通过"自展"，可以从简单结构的CAD公式推出较复杂结构的CAD公式，如本文中可以从简单的贴片电容公式出发最终推出较复杂的螺旋电感公式。

Don not attempt to do something which you can not to do.

不要企图做那些办不到的事情。

The expression of CTGF and TNF-αweredetected by immunochemistry and the number of Clara Cells was calculated.

光镜下观察肺组织的病理变化，采用免疫组化染色观察肺组织中结缔组织生长因子和肿瘤坏死因子-α的表达和Clara细胞的数量。