查询词典 polyhedral angle

Synthesis and characterization of Octa polyhedral oligomeric silsesquioxanes and Poly and their polystyrene composites enhanced combustion properties.

使用正硅酸乙酯和四甲基氢氧化铵，采用水解缩合的方法制备笼型八八硅酸盐，将其作为聚苯乙烯树脂的添加剂，采用熔融共混的方法制备了TMN-POSS／PS复合材料。

Cage--like silsesquioxane is a kind of polyhedral compound,which iscomposited of organic and inorganic molecules.The structures of the cage—like silsesquioxane can be determined by 29Si NMR,effectively.Westudied the structures of six kinds of cage—like octa silsesquioxane by NMR.

通过对一类新型含硅材料一笼形倍半硅氧烷结构的研究，总结了这类化合物中29si NMR的影响因素，即取代基R的电负性是影响29si化学位移的主要因素，R电负性增强29Si化学位移移向高场。

Then the surface of the star polymer was intramolecularly crosslinked using octa(3-azidopropyl)polyhedral oligomeric silsesquioxane, POSS-(N_3)_8,as the inorganic multifunctional crosslinker at high dilution concentration via click chemistry,forming a novel POSS/polymer hybrid nanostructure.Thermogravimetric analysis shows that after surface crosslinking, the thermostability of the core crosslinked PS can be remarkably improved.In the second work,we synthesized of a novel polymer with quatrefoil-shaped topology.

接着，我们合成了一种结构规整的含八个叠氮功能团的无机分子—多面低聚倍半硅氧烷，以其为交联剂，我们通过Click反应在即稀浓度下实现了前驱体星型聚合物的分子内表面交联，得到了外层为无机分子交联，内层为有机高分子的星状高分子，这种新型的星状聚合物表现出了优良的热稳定性能。

Similar lamellar hybrids can be obtained from octa(y-chloroammoniumpropyl) polyhedral oligomeric silsesquioxanes dodecyl benzene sulfonic acid sodium salt C_(18H_(29)NaO_3S, DBSS. Further research shows that different POSS to surfactant ratios result in different arrangement of layers: when there exists excessive POSS, the layer is arranged in a "Alkyl-POSS-POSS-Alkyl" sequence; while on the contrary, the layer is in "Alkyl-POSS" sequence.

实验研究表明，通过调整POSS和表面活性剂的物质的量比例可以改变片层结构，发现当POSS成分大大过量的时候，片层重复单元按照&烷基-POSS-POSS-烷基&顺序排列，对应较大的层间距；当表面活性剂成分大大过量的时候，片层重复单元按照&烷基-POSS&顺序排列，对应较小的层间距。

It has been found that epitaxy occur in the powder by hydrothermal salt solution hydrolysis method using ZrO(NO3)2 solution as precursor,Authors consider crystal particle as a big growth unit to make epitaxy well-explained using polyhedral structure of coordinative anions model.

作者从负离子配位多面体理论模型角度，提出了把晶粒当作一个大生长基元来考虑，从而更合理地解释了取向连生和配向附生存在的规律性。

Random circle and sphere aggregate models, convex polygon and convex polyhedral aggregate models are separately adopted in the paper to simulate the flexural fracture process of concrete specimens in view of meso-mechanics.

本文分别采用随机圆形骨料、球骨料与多边形、多面体骨料模型，通过对全级配大坝混凝土试件弯拉破坏过程的细观数值模拟，对比分析了不同骨料模型形态对计算结果的影响，探讨了用球形骨料或圆形骨料简化实际碎石骨料的有效性。

Chapter four analyses the model that executed in chapter two and chapter three, and sets up the mature reseau analysis method of random convex polyhedral aggregate model of 2d and 3d.

第四章主要对第二章和第三章建立的模型进行有限元剖分工作，建立了一套成熟的二维、三维混凝土随机骨料模型的网格剖分方法。

Based on its structure and properties the organic/inorganic hybrid of polyhedral oligomeric silsesquioxanes are summarized. And the development tendency of POSS was discussed.

摘要从笼型倍半硅氧烷的结构特点及主要性能方面出发，对笼型倍半硅氧烷的有机／无机杂化改性进行了综合性描述，评述了它们的发展趋势。

Built geodesic dome , geodesic dome , dense grid, dome , geodesic dome , polyhedral dome .

测地线拱顶，短程线拱顶，密网格穹隆，网格球顶，多面体穹窿。

First, may from the Western law thought angle of view cognition method society standard idea; Next, may carefully examine the economic rules and regulations from the legal rational angle of view the social standard characteristic; Once more, may from the adjacent discipline angle of view exploration economic rules and regulations social standard connotation.

首先，可以从西方法律思想的视角认知法的社会本位理念；其次，可以从法律理性的视角审视经济法的社会本位特征；再次，可以从毗邻学科的视角探索经济法的社会本位内涵。

Foods high in this vitamin include oily fish such as salmon, tuna and, and fish liver oils.

维生素D含量高的食物包括诸如大麻哈鱼、金枪鱼和鲭鱼之类的油鱼以及鱼肝油。

We need you to cosign our public letter demanding that press intimidation cease immediately, and that all charges be dropped.

我们需要您cosign我们的公共信，要求记者立即停止恐吓，并要求所有收费下降。