构

The reasons of shield tunnel segments floating are discussed first,including the buoyancy produced by water,grouts or slurry,the gap produced by shield shell,and the disturbance produced by excavation to overburden soil,etc.

基于大断面盾构隧道施工中经常碰到的上浮问题，首先讨论了盾构隧道施工中管片上浮的原因：水、注浆所用浆液、泥水盾构所用泥浆等所产生的浮力，以及建筑间隙的存在、施工过程对上覆土的扰动等，都可能是盾构管片上浮的原因。

Theoretical studies on various geometrical structures of Hypophosphorous acid were carried out using DFT theoretical methods,at the B3LYP/6—311++G** level.Intramolecular proton transfer isomerization has also been studied using the intrinsic reaction coordinate.

采用量子化学密度泛函B3LYP方法，在6—311++G**基组水平上全优化得到了硫代次磷酸的硫酮式和硫醇式两种构型异构体以及相应的对映异构体，同时对分子内质子转移异构化反应微观机理进行了理论分析。

Theoretical studies on various geometrical structures of Hypophosphorous acid were carried out using DFT theoretical methods, at the B3LYP/6-311 ++ G(superscript **) level. Intramolecular proton transfer isomerization has also been studied using the intrinsic reaction coordinate.

采用量子化学密度泛函B3LYP方法，在6-311++G基组水平上全优化得到了硫代次磷酸的硫酮式和硫醇式两种构型异构体以及相应的对映异构体，同时对分子内质子转移异构化反应微观机理进行了理论分析。

Keywords hypophosphorous acid;thiol isomer thione isomers;enantiomer;proton transfer;isomerization reaction

单硫代次膦酸；硫酮式异构体；硫醇式异构体；对映异构体；质子转移异构化

The results indicated that GLP was a linear (1→3)β-D-Glcp main chain linkage. Its monosaccharide component was predominantly composed of D-Glc, and small amount of galactose, mannose, xylose and idose, residues of branches terminated with substituted at 1→6 by a small number of singleunit β-D-Glcp side-chains, it's also observed that the (1→3)-linked β-D-glucan contained a triple-helical conformation, which was composed of a repeating unit with a structure as below:.

结果表明：灵芝多糖含有三螺旋体构型，GC-MS分析灵芝多糖的主要单糖组分为葡萄糖，还有少量的半乳糖、甘露糖、木糖和艾杜糖，IR及1HNMR分析多糖为β-构型，HIO4氧化、Smith降解和甲基化分析表明：多糖主要为(1→3)糖苷键连接构型，并伴有少量的1→6位支链键连接的结构，灵芝多糖是由D-葡萄糖单元通过β-(1→3)糖苷键连接葡聚多糖，其主要构型特征为(1→3)β-D-线性连接的骨架结构。

Analysis is made on the risks of the shield tunneling across the existing railway by means of FEM and the following technical countermeasures are proposed: firstly, preconsolidation is made for the ground where the shield passes so as to improve the ground's stability; secondly, strengthened segments with preserved grouting holes are adopted in the tunnel design; thirdly, proper resources are allocated, the construction parameters are optimized and the construction monitoring and measurement are enhanced; finally, the shield tunneling is executed strictly following the predetermined plan.

采用有限元理论分析在有无旋喷桩情况下盾构穿越铁路的风险因素、提出控制沉降的技术措施：首先对盾构穿越区的地层进行了预先加固来改良地层，使地层有较好的稳定性；其次在盾构隧道设计上采用加强性管片，并增加施工预留注浆孔；在盾构穿越过程中合理配置资源，优化施工参数，加强监测和信息化管理。

When a strong electron-withdrawing group (e.g., nitrobenzene group) is located on the position 3, the twisted configuration between pyrazoline ring and the substituted phenyl group on the position 3 is the fluorescence emission configuration of this kind of 2-pyrazolines, and the planar configuration between two moieties is also the best non-radiative decay configuration of these compounds.

对于C3位取代基为强的拉电子基团的化合物，C3位取代基与吡唑啉环相扭曲的构象是化合物分子的发光构象，而两者处于同一平面的构象是化合物的最佳非辐射衰变构象，与N1所联取代基的旋转扭曲无关。

It can be proposed that when the substituent is an electron donor, the twisted configuration between pyrazoline ring and the moiety attached on N1 is the fluorescence-emitted configuration of 2-pyrazoline, and the configuration where two moieties are placed in a co-plane is the best non-radiative decay configuration of these compounds.

这表明，对于C3位取代基为推电子基或弱的拉电子基团的化合物，N1所联取代基与吡唑啉环相扭曲的构象是化合物的发光构象，两者处于同一平面的构象是化合物的最佳非辐射衰变构象，与C3所联取代基的旋转扭曲无关。

From the photophysical behaviors of 1, 3, 4-triaryl-2pyrazoline compound (TPP16) at low temperature, it can be considered that the twisted configuration between pyrazoline ring and the non-substituted phenyl group on the position 1 is the fluorescence configuration of conjugated system Ⅰ, and the twisted configuration between pyrazoline ring and P-nitrobenzene group is fluorescence configuration of conjugated system Ⅱ.

研究了1，3，4-三芳基-2-吡唑啉化合物TPP16在低温时的发光情况，发现：在低温77K下，共轭体系Ⅰ(苯基-N1-N2＝C3-苯基)在非极性溶剂中不发荧光，在极性溶剂中有较强荧光发射；而共轭体系Ⅱ(N1-N2＝C3-C4＝对硝基苄叉)在非极性溶剂或极性溶剂中均有荧光发射，表明N1所联取代基与吡唑啉环相扭曲的构象是共轭体系Ⅰ的发光构象，而对硝基苄叉与吡唑啉环相扭曲的构象是共轭体系Ⅱ的发光构象。

Completely different crystal structures and morphology were shown in the meltdrawn films of two kinds of tacticity of sPP. A continuous conformational transform from the 〓 into the of sPP was induced by further stretching. While the zigzag conformation can retransform back to helical 〓 one after annealing above 80℃, the mechanism of conformation transform has been introduced.

Petermann教授学科专业高分子化学与物理研究领域\研究方向学位级别博士学位授予单位中国科学院长春应用化学研究所学位授予日期2001 论文页码总数114页关键词聚丙烯聚丁烯共聚物聚α-烯烃馆藏号BSLW /2003 /O632 /3 用电子显微学、电子衍射、DSC和FTIR等技术对聚α-烯烃及其共聚物的晶体结构和相转变行为进行了系统地研究，包括间同立构聚丙烯、全同立构和间同立构聚丁烯-1（iPB-1，sPB-1）、以及丙烯-丁烯-1间同立构共聚物。

I am accused of being overreligious," she said in her quiet, frank manner,"but that does not prevent me thinking the children very cruel who obstinately commit such suicide.""

客人们在卡罗利娜·埃凯家里，举止就文雅一些，因为卡罗利娜的母亲治家很严厉。

Designed by French fashion house Herm è s, this elegant uniform was manufactured in our home, Hong Kong, and was the first without a hat.

由著名品牌 Herm è s 设计，这件高贵的制服是香港本土制造，是我们第一套不配帽子的制服。