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A new organic compound, trans-2--5-dimesitylborylthiophene (abbreviated as DMASBT, 5) with dimesitylboryl, dimethylamino and styryl-thiophene as electron acceptor, electron donor and conjugate bridge respectively, was synthesized. Its crystal structure determined by X-ray diffraction method indicates that the B-C bond between B atom and it bridge is obviously shorter than those of between B atom and mesityl groups. This remarkably strengthened B-C bonding can be regarded as an evidence of additional p-7t conjugation between the B atom and n bridge.

合成了以含硼基团为电子受体，以二甲胺基为电子给体，以苯乙烯基噻吩为共轭桥的新化合物2-[（4'-N，N-二甲胺基）苯乙烯基]-5-二米基硼-噻吩 trans-2-[(4'-N， N-dimethylamino) styryl]-5-dimesitylboryl-thiophene（简写为DMASBT，5）。X射线衍射方法测定其单晶结构表明，硼原子与π共轭桥之间的硼碳键相对于其它的硼碳键明显缩短，硼与π共轭桥之间存在除了σ键之外的p-π共轭作用。

This paper discusses the alkyl′s attracting electron effect,and by the calculation of dipolar moment it analyses the cause of the alkyl′s attracting electron effect.

扼要介绍了烷基的吸电子效应，并通过偶极矩的计算分析了甲基吸电子效应的成

A highly ordered copper phthalocyanine-3,4',4",4"'-tetrasulfonic acid, tetrasodium salt/4,4'-dipyridyl dihydrochloride nanotube array was successfully fabricated by the layer-by-layer self-assembly technique using micropore anodic aluminum oxide as templates. The assembly process of the nanotube array was investigated by UV-Vis spectrometry, XRD and FT-IR, and the morphology of the nanotubes was analyzed by scanning electron microscopy and transmission electron microscopy, respectively.

在阳极多孔氧化铝模板中利用层层自组装技术制备出了高度有序的聚电解质磺化酞菁铜/4，4′-联吡啶盐酸盐纳米管，并对其组装过程用UV-Vis， XRD和FT-IR进行了分析，纳米管的微观形貌通过SEM和TEM进行表征。

This protocol could also be used for the selective reduction of the endocyclic double bond of the 3-electron withdrawing group substituted coumarins. This method is clean, mild, and efficient.2 ZrCl_4 / HEH was found to be a selective and efficient reagent combination for the direct reductive amination of electron rich aldehydes and ketones with weakly basic amines after scanning various catalysts such as InCl_3, BiCl_3, CF_3COOH and so on.

图一 1。我们用汉斯酯作为有机还原剂，乙醇为溶剂，实现了4-甲叉基噁嗯唑酮和吡唑酮环外双键的高选择性还原；此外，我们还将这一还原体系用于3-吸电子集团取代-3，4-二氢香豆素环内双键的选择性还原。

Evolvable hardware can improve reliability and usability of electron system especially the electron devices which work chronically in the terrible environment.

演化硬件的实现可大大提高电子系统的可靠性及可用性，对需要在特殊工作环境中长期工作的电路设备具有重大意义。

ABSTRACT In this paper, some problems in harmonic free electron lasers and plasma wave wiggler FELs are investigated. The applications of FEL in material science are discussed in detail. As an example, KrF excimer laser was used to investigate the a-Si: H thin film solar cells instead of the free electron laser.

本论文对适用于应用的谐波自由电子激光和等离子体波泵Wiggler型自由电子激光中的若干问题进行了研究，对自由电子激光在材料科学领域的应用及应用前景进行了详细讨论，并使用KrF准分子激光器代替自由电子激光进行了模拟自由电子激光对α-Si〓H太阳能电池的改性实验。

The structure of spore wall of more than 10 species of the fern Filicales and the structure and development of sporoderm of 7 representative species of Filicales were studied contrastively by Light microscope, scanning electron microscope and transmission electron microscope.

主要采用光镜、扫描电镜和透射电镜对照的方法，对我国产真蕨目10多种真蕨孢子主要类型的壁层结构进行了观察，并对7种典型类型的代表种进行了孢壁结构和发育的研究。

The electron donorability of the electron donor part of the fulgide decreases when cationcomplexes with crown ether, and the intromolecular charge transfereffect reduces.

金属离子较大的电荷密度以及金属离子与冠醚较好的匹配使冠醚俘精酸酐分子内的电荷转移更不易进行，造成了光谱较大的蓝移。

The article simply intrduces the working principle of Scanning Electron Microscope,and dis-cusses the application of Scanning Electron Microscope with EDS in gemmology to the identify gems , synthetic gems and optimizing gems and so on.

本文简要介绍了扫描电子显微镜的工作原理，并结合能谱仪，探讨了扫描电子显微镜在宝石学中鉴定天然宝石与合成宝石及优化宝石等方面的应用。

The products were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy and thermal gravimetric analysis.

采用X射线衍射仪、傅里叶变换红外光谱仪、扫描电子显微镜、透射电子显微镜和热失重分析仪等对产物的组成、形貌以及热失重情况进行了表征。

The labia have now been sutured together almost completely.The drains and the Foley catheter come out at the top.

此刻阴唇已经几乎完全的缝在一起了，排除多余淤血体液的管子和Foley导管从顶端冒出来。

To get the business done, I suggest we split the difference in price.

为了做成这笔生意，我建议我们在价格上大家各让一半。