双位

In the crystal, the tin atoms are five-coordinated in trigonal bipyramidal structure by bridging pyridine N atoms, resulting in the chain organotin compound.

该化合物中心锡原子为五配位三角双锥构型，并且通过4-吡啶甲酸配体的氮原子桥联作用形成一维无限链状结构。

It is found that in this structure the molybdenum atom is coordinated by six sulfur atoms of three 1, 1 -dicynoethylene 2 ,2 -dithiolate(i-mnt2 -) ligands and a terminal oxygen atom, forming a distorted pentagonal bipyramidal structure.

结构分析结果说明Mo原子与三个配位基的六个硫原子和一个端基氧形成扭歪五角双锥结构。

Structure analysis indicates that it crystallizes in triclinic, space group P1, a =9.554(3)A, b =10.4874(18) A, c =14.027(2) A,α=91.873(15)°,β=91.879(19)°,γ=92.86(2)°. The polymeric anion of [(CH3)4N]As3S5 consists of adjacent 1∞[AS3S5]- chains linked together into a 1∞ [As6S10]2- double chains through planar As2S2 rings . A relatively undistorted Ψ-AsS4 trigonal bipyramidal geometry is observed for the participating As atoms.

b=10.4874(18)，c=14.027(2)，α=91.873(15)°，β=91.879(19)°，γ=92.86(2)°。化合物[(CH_3)_4N]As_3S_5结构中聚合阴离子由邻近的~1_∞[As_3S_5]~-通过平面环As_2S_2连接形成~1_∞[As_6S_(10)]~(2-)链，这种链通过每第二个结构单元环状As_3S_3结构单元的As原子连接组成双链结构，其结构中可观察到赝三角锥配位的ψ-AsS_4。

This relationship between body composition and cognitive function in old age is still unclear, the authors write. To address this question, the researchers used data from the Chicago Health and Aging Project, a longitudinal study conducted from 1993 to 2003 in a biracial community on the south side of Chicago, with an average of 6.4 years of follow-up. The cohort included 3885 community-dwelling adults aged 65 years and older who participated in at least 2 assessments.

作者表示，年长者的身体组成和认知功能之间的关系仍不清楚，为了找出此问题的答案，研究者使用芝加哥健康与老年计画「Chicago Health and Aging Project 」的资料，从1993到2003年，在芝加哥南部的一个双种族社区进行纵向研究，平均追踪期间为6.4年，该世代包括3，885位居住於该社区的65岁以上住民，且参加至少2次评估。

1905, fort of heart of Swedish elder brother young maintenance engineer Mr Wen Guisi, as a result of bearing often damage special affliction, invented ball bearing of self-regulated heart biserial consequently, founded successfully 1907 SKF bearing firm.

1905年，瑞典哥德堡一位年轻的维修工程师温贵斯先生，由于轴承的经常损坏非常苦恼，因而发明了自调心双列球轴承，并成功地在1907年创立了SKF轴承公司。2007年5月23日，作为一家知识性的工程公司，SKF在成立100年之际，在上海举办了第三届SKF技术日活动，向中国市场展示了其能效型。。。。。。

Schedel et al. investigated the efficacy of Hirudoid forte in 40 patients with postoperI bitis under double-blind conditions in comparison to placebo.

Schedel等人研究了特强喜疗妥软膏的疗效，以安慰剂为对照，双盲，受试对象为40位患者。

The display ability of CTA,2D DSA and 3D DSA for the 101 aneurysms was retrospectively analyzed and assessed by two neuroradiologists blindedly,which contains aneurysm detective rate,and visibilities of both aneurismal neck and its relation to parent artery according to its location and size (dividing into two groups with a diameter≥3mm and＜3mm).

由两位放射科医生双盲法分别对CTA、2D DSA及3D DSA三种方法按部位及大小分两组(≥3mm组及＜3mm组)评价颅内101个动脉瘤的检出率和动脉瘤颈的可见度及与载瘤动脉的位置关系。

The structural and photocatalytic properties of TiO〓 as well as surface acidity were greatly improved by sulfation. SO〓〓/TiO〓 solid superacid with Hammett constant Ho less than -12.14 was prepared by treating the TiO〓 with 1.0mol. L〓 sulfuric acid solution and then calcining at 450℃ for 3h. When compared to unmodified TiO〓, the SO〓〓/TiO〓 superacid catalyst exhibited higher anatase content, smaller crystal size, higher specific surface area, centralized pore size distribution, and the blue-shifted band edge of uv-vis adsorption spectra. Furthermore, the SO〓〓/TiO〓 superacid also showed excellent reaction activity and stability for CH〓Br photocatalytic decomposition even under the moist reaction conditions. The apparent quantum efficiency of SO〓〓/TiO〓 was 10 times of that of TiO〓 catalyst for the photocatalytic degradation of bromomethane. Therefore, the SO〓〓/TiO〓 superacid catalyst is promising for practical application in environmental remediation.It was found that both L and B acid sites exist on SO〓〓/TiO〓 photocatalyst while only L acid sites on TiO〓 photocatalyst. On the basis of experimental results, the synergistic model of superacidic centers was proposed for SO〓〓/TiO〓 photocatalyst to explain the photocatalytic behavior and the mechanism of superacidifing effects, assuming that the adjacent L and B acid sites induced by SO〓〓 comprise cooperatively the superacidic center on superacid photocatalyst. The group cooperation of the superacidic center could strengthen the surface acidity, increase surface acid sites and the adsorbtion of O〓, promote separation of photogenerated electron-hole pair, enhance the interfacial transfer of charges and reversibility of water adsorption. Consequently the excellent photocatalytic activity, reaction stability and resistibility to humidity of SO〓〓/TiO〓 superacid photocatalyst may attributed to the group cooperated effect of the superacidic center on the photocatalyst.

研究结果表明：SO〓〓与TiO〓表面的结合为螯合式双配位结构；TiO〓光催化剂表面经H〓SO〓浸渍处理后，提高了表面酸性，改善了催化剂结构和光催化性能，当H〓SO〓浸渍浓度为1.0mol.L〓、烧结温度为450℃时，可制得SO〓〓/TiO〓超强酸催化剂(H〓＜-12.14)，其结构和光催化活性得到明显改善，与TiO〓相比，SO〓〓/TiO〓光催化剂的锐钛矿含量高、晶粒小、BET比表面积大、孔径分布集中、光谱吸收边蓝移，具有优异的光催化氧化活性、稳定性及抗湿性能，光催化降解溴代甲烷的表观量子效率比TiO〓催化剂提高了一个数量级，是一种有实际应用前景的高效光催化剂；由此提出了SO〓〓/TiO〓超强酸催化剂表面集团协同作用的超强酸中心模型，认为在SO〓〓/TiO〓超强酸催化剂表面，由SO〓〓诱导的相邻L酸中心和B酸中心组成了集团协同作用的超强酸中心，其集团协同作用显著地增强了催化剂表面酸性、增大了表面酸量及O〓吸附量、促进了光生电子和空穴的分离及界面电荷转移，具有可逆吸附水的性能，是SO〓〓/TiO〓超强酸催化剂具有优异的光催化氧化活性、很好的活性稳定性及抗湿性能的重要原因。

The apparent quantum efficiency of SO〓〓/TiO〓 was 10 times of that of TiO〓 catalyst for the photocatalytic degradation of bromomethane. Therefore, the SO〓〓/TiO〓 superacid catalyst is promising for practical application in environmental remediation.It was found that both L and B acid sites exist on SO〓〓/TiO〓 photocatalyst while only L acid sites on TiO〓 photocatalyst. On the basis of experimental results, the synergistic model of superacidic centers was proposed for SO〓〓/TiO〓 photocatalyst to explain the photocatalytic behavior and the mechanism of superacidifing effects, assuming that the adjacent L and B acid sites induced by SO〓〓 comprise cooperatively the superacidic center on superacid photocatalyst. The group cooperation of the superacidic center could strengthen the surface acidity, increase surface acid sites and the adsorbtion of O〓, promote separation of photogenerated electron-hole pair, enhance the interfacial transfer of charges and reversibility of water adsorption. Consequently the excellent photocatalytic activity, reaction stability and resistibility to humidity of SO〓〓/TiO〓 superacid photocatalyst may attributed to the group cooperated effect of the superacidic center on the photocatalyst.

研究结果表明：SO〓〓与TiO〓表面的结合为螯合式双配位结构；TiO〓光催化剂表面经H〓SO〓浸渍处理后，提高了表面酸性，改善了催化剂结构和光催化性能，当H〓SO〓浸渍浓度为1.0mol.L〓、烧结温度为450℃时，可制得SO〓〓/TiO〓超强酸催化剂(H〓＜-12.14)，其结构和光催化活性得到明显改善，与TiO〓相比，SO〓〓/TiO〓光催化剂的锐钛矿含量高、晶粒小、BET比表面积大、孔径分布集中、光谱吸收边蓝移，具有优异的光催化氧化活性、稳定性及抗湿性能，光催化降解溴代甲烷的表观量子效率比TiO〓催化剂提高了一个数量级，是一种有实际应用前景的高效光催化剂；由此提出了SO〓〓/TiO〓超强酸催化剂表面集团协同作用的超强酸中心模型，认为在SO〓〓/TiO〓超强酸催化剂表面，由SO〓〓诱导的相邻L酸中心和B酸中心组成了集团协同作用的超强酸中心，其集团协同作用显著地增强了催化剂表面酸性、增大了表面酸量及O〓吸附量、促进了光生电子和空穴的分离及界面电荷转移，具有可逆吸附水的性能，是SO〓〓/TiO〓超强酸催化剂具有优异的光催化氧化活性、很好的活性稳定性及抗湿性能的重要原因。

The results can be expressed as follows:(1) With the increase of water phase content, the amine salt aggregated orderly in different forms such as W/O micro-emulsion, nodus-knot catenulate aggregates, layer liquid crystal and O/W micro-emulsion.(2) In layer liquid crystal, SO〓 mainly combined with amine salt cation by two oxygen atoms in bridge.(3) In UV-VIS spectrum of layer L. C., there is an absorption about 500 nm and "light short circuit"appeared about 430 nm. These phenomena may be very important for measuring the distance between the layers of the L.

研究发现该体系随水相含量的增加，胺盐发生不同形式的有序缔合，分别形成了W/O型微乳液、&节-结&型链状缔合体、层状液晶和O/W型微乳液：在层状液晶中，SO〓主要以桥式双齿配位形式存在，中性胺分子有利于体系中液晶的形成；层状液晶于500nm波长处有一吸收峰，在430nm附近发生&光短路&现象，该现象可能对测定层状液晶的层间距有重要意义。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。