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Five of their single crystals were obtained and their structures were determined by X-ray diffraction. By comparison, it was found that dithiocabamate complexes often formed an exactly planar MS4 unit, such as [Mo(R2dtc)2]; and also formed a special MS 5 unit, such as [Cu2(R2dtc)4], the copper atom lies in a distorted square-pyramidal environment.Four kinds of heteropoly acids were prepared and characterized; a series of solid superacid catalyst of supported heteropoly acid were prepared and characterized; regioselectivites of chlorobenzene mononitration with nitric acid with different heteropoly acid on different supports and reaction conditions have been investigated.

培养并解析了5个该类配合物的单晶结构,通过比较,发现二硫代氨基甲酸盐与过渡金属容易形成四配位结构,金属原子与4个硫原子共平面,比如二乙基二硫代氨基甲酸钼;也能形成比较特殊的五配位结构,比如二乙基二硫代氨基甲酸双核铜,Cu原子与5个S原子相连,处于一个变形的四方锥结构的配位环境。

Chiral SalanCrX complexesa saturated version of SalenCr(ⅢX are designed,and in conjunction with an ionic quaternary ammonium salt or organic strong base can efficiently catalyze the asymmetric,regio-and stereoselective alternating copolymerization of CO_2 with rac-PO at mild conditions to afford isotactic-enriched polycarbonates with~95%head-to-tail linkages and moderate enantioselectivity.

本论文在Salen构型配体的基础上,设计合成了一系列手性Salan型铬配合物,并将其与季铵盐/有机强碱组成亲电-亲核双组分催化体系,在室温下可以有效的催化CO_2和环氧丙烷的不对称交替共聚反应,实现了CO_2和环氧丙烷的不对称交替共聚反应的区域和立体化学控制,得到95%的头尾连接单元和中等光学纯度(对映体过量值ee%≈70%)的全同结构的聚碳酸酯。

At the same time, the anti-attack ability of the system is also improved. Even if some analysis module cannot work, it does not affect other modules. The packet capture module is the base of entire system. At present, most NIDS develop their packet capture module based on libpcap library whose windows edition is winpcap. Allowing for capturing efficiency and self-determined intellectual property and cooperation of each module, we program protocol driver to capture packets. By following methods such as filter in driver and decrease packet copies between user mode and kernel mode, we enhance the capturing efficiency.

网络数据包采集模块是整个系统高效工作的基础,目前国内外的大多数网络入侵检测系统的数据采集模块,都是利用libpcap提供的函数库来实现,其在Windows下的版本为winpcap,考虑到采集效率、自主知识产权、采集模块与系统其他模块的配合等因素,我们采用自己编写协议驱动程序来采集数据包,并通过在驱动程序中实施过滤、减少数据包在用户态空间和核心态空间之间拷贝的次数等方法,提高采集的效率。

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With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务,乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐,因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。

Closes the eye, the deep breathing, all no longer are the dreams as if......

关闭眼睛,深呼吸,一切不再是梦想,犹如。。。。。。