中心体

Two inorganic-organic hybrid materials,〓(C〓H〓O〓=isophthalate or terephthalate), have been assembled for the first time from the new type metal center Zn〓 and benzene dicarboxylate links.

首次以新型金属中心Zn〓分别和间苯二甲酸、对苯二甲酸配体合成了2个配位聚合物无机-有机杂化材料。

Two inorganic-organic hybrid materials, [Zn_8(SiO_4)(C_8H_4O_4)_6]_n (C_8H_4O+4 = isophthalate or terephthalate), have been assembled for the first time from the new type metal center Zn_8(Si0_4) and benzene dicarboxylate links.

首次以新型金属中心Zn_8(SiO_4)分别和间苯二甲酸、对苯二甲酸配体合成了2个配位聚合物无机-有机杂化材料。

The first asymmetric total synthesis of coumarinolignoids Daphneticin and it's enantiomer was accomplished starting from 7-hydroxycoumarin and 3, 4, 5-trimethoxybenzaldehyde, in which Sharpless asymmetric dihydroxy reaction was used to construct chiral center, and Mitsunobu reaction was used to obtain desired configuration.

并以7-羟基香豆素和3，4，5-三甲氧基苯甲醛为起始原料，用Sharpless不对称双羟化反应构筑手性中心，用Mitsunobu偶联反应作为关键步骤，合成了手性的香豆素木脂素Daphneticin及其异构体。

Monte Carlo simulation is one of effective ways to get this kind of dosimetric parameters. In this paper, the absorbed doses at the central axis in different phantoms with inhomogeneity media and finite sizes for small field size beams were simulated with Monte Carlo code system EGSnrc, respectively.

本文利用蒙特卡罗方法模拟计算了临床上常用的点源光子束在有限宽非均匀模体中的沉积能量，研究了不同射野条件下中心轴上的剂量分布，并用剂量扰动因子定量分析了剂量增强或减弱效应的强度。

The chelating ability of its enolate anion (TTF-ph-tfac) has been investigated with [MIICl_2·xH_2O] (M = Zn and Co) leading to complexes Zn(TTF-ph-tfac)_2(CH_3OH)_2 (7) and Co(TTF-ph-tfac)_2(CH_3OH)_2 (8), where the metal center is coordinated by two TTF-ph-tfac ligands. This redox active ligand shows promising features for the elaboration of hybrid organic-inorganic building blocks.

具有反铁磁行为的化合物5在110-120K观察到了相转变的发生，是目前已报道的该类化合物中最高的相变温度。3、TTF-ph-tfac烯醇阴离子具有很强的配位能力，与金属氯化物螯合配位分别生成了配合物Zn(TTF-ph-tfac)_2(CH_3OH)_2 (7)和Co(TTF-ph-tfac)_2(CH_3OH)_2 (8)，每个中心金属都桥连两个TTF-ph-tfac配体。

The crystal is monoclinic,space group 〓, the ligand coordinates to Ni acetate in the enolic form,and produces a square complex.

单晶的结构是：晶体属于单斜晶系，空间群为〓，镍原子位于平面四方形配位中心，配体分子是以内式的烯醇式向镍原子配位的。

The pinwheel's core contains the apical endings of B1 cells and in its periphery two types of ependymal cells: multiciliated (E1) and a type (E2) characterized by only two cilia and extraordinarily complex basal bodies.

其中风车的中心含有B1细胞的顶端末梢，而在风车周围则包含两种室管膜细胞：其中一种是多纤毛的E1细胞，另一种则是具有2纤毛以及非常复杂基体的E2细胞。

The pinwheel's core contains the apical endings of B1 cells and in its periphery two types of ependymal cells: multiciliated (E1) and a type (E2) characterized by only two cilia and extraordinarily complex basal bodies.

其车的中心含有B1细胞的顶端末梢，而在风车周围则包含两种室管膜细胞：其中一种是多纤毛的E1细胞，另一种则是具有2纤毛以及非常复杂基体的E2细胞。

On the industrial experiments the effect of electromagnetic stirring on central porosity ,equiaxial crystal ratio,shrinkage cavities and surface quality as well as effect of electromagnetic stirring on the solidification of the continuous casting billet have been analyzed and discussed.

根据工业试验结果，分析了结晶器电磁搅拌对马氏体不锈钢连铸坯的中心疏松、等轴晶率、缩孔及表面质量的影响，并对电磁搅拌对铸坯凝固的影响机理进行了探讨。

Recently John is fully engaged in The Hong Kong Guitar and Gem Centre's Music and Gemmology courses, he also appears as the Guest Guitar Tutor in the Department of Creative Arts and Physical Education of The Hong Kong Institute of Education and is actively arranging pieces for guitar ensembles and guitar chamber music contributing to the Hong Kong community.

甘兆棠先生现全职投身於香港结他及宝石中心的音乐和宝石教育等工作，并为香港教育学院体艺学系客席结他导师和忙於为乐团和器乐合奏作编曲，冀望能为香港的古典结他乐坛多作一分贡献。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。