查询词典 polyhedral

So the body-centred cubic structure of Li9 has the greatest binding energy for per atom among body-centered regular polyhedral structures of Lin (n= 5 ,7,9,13), which may be a reason for alkali metal crystal adopting the body-centred cubic structure as its unit cell.

故在体心正多面体结构Lin (n= 5 ，7，9，13)中，Li9的体心立方结构有最大的原子平均结合能，这也许是碱金属晶体的晶胞取体心立方结构的一个原因。

Phages usually have complex capsids composed of a polyhedral head, containing the nucleic acid, and a helical tail, through which nucleic acid is injected into the host.

噬菌体通常由复杂的衣壳组成一个多角体的头部，包含有核酸（ DNA 或 RNA ）和螺旋状的尾管，通过这个尾管核酸可以被注入寄主的体内。

Contact-state recognition takes a great role in robotic assembly manipulation. After modeling the force-sensing uncertainties and approximating the Coulomb friction cone with polyhedral cone, a linear programming procedure is formulated to test the feasibility of an assumed contact state.

对装配操作中接触状态的转移过程及其实现进行了分析，建立了接触约束网络图的构造过程，提出了操作中接触状态路径的规划算法以及接触状态改变与转移的机器人有关运动参数的求解方法及其优化指标。

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。

Objective To investigate the effects of interleukin-1 β converting enzyme gene on the biologic characteristics of ovarian cancer cells.

目的 探讨白细胞介素-1 β转换酶的表达，对卵巢癌细胞生物学特性的影响。

Campylobacter: This illness is the most commonly identified cause of diarrheal illness in the world.

弯曲：这种病是最常见的原因查明腹泻病，在世界上。