SYNTHESIS AND MOLECULAR STRUCTURE OF Co（Ph2pyPO—N,O）2Cl2[Ph2pyPO=DIPHENYL（2—PYRIDYL）PHOSPHINE OXIDE]

<正> Complex Co(Ph2pyPO-N,O)2Cl2 was synthesized and its crystal and molecular structure was determined. Crystal data: Co(Ph2C5H5NPO-N,O)2Cl2, Mr = 688.4, monoclinic, space group A 2/a, a = 13.085(2), b = 11.134(3), c = 21.769(4)A,β=102.29(1)°,Z = 4, V = 3098.6 A3, DC = 1.476 g/cm3, final R= 0.049 and Rw=0.057 for 2804 independent reflections. The cobalt atom in the title molecules is coordinated by two chlorine atoms and two nitrogen and two oxygen atoms from the two phosphine oxide ligands, forming a distorted octahedron.     

A New Approach to α—Bromochalcones

α-Bromo benzolymethylene triphenylphosphorane 3 has been synthesized by the reaction of benzoylmethylene triphenylphosphorane 1 with N-bromosuccinimide in the yield of 87% and can react with aromatic aldehydes 4 to give α-bromochalcones 5 in good yields.     

Synthesis and Properties of Aryloxy—terminated Polydimethylsiloxanes

Aryloxy-terminated polydimethylsiloxanes (AOS) were synthesized by the telomerization of hexamethylcyclotrisiloxane(D3) with phenols.The structures of AOS were characterized by UV,IR,^2HNMR and elemental analysis,The effects of the reaction conditions and the mole ratios of the reactants on the molecular weight of the polymer were discussed.AOS′s structural influence on bactericidal action,flocculation and hydrolysis was studied.     

继电保护相关二次回路的在线状态检测技术

本文主要探究的内容是继电保护相关二次回路的在线状态检测技术,针对这一技术进行了有效的分析。首先本文探讨了在当下二次回路在线状态检测的基本内容和含义,明确了这一技术检测工作的重要性。之后,对继电保护二次回路在线检测技术在当前进行应用的途径进行了分析,通过交流回路在线检测以及断路器在线检验,还有二次回路开关量在线状态检测,包括最后在二次操作回路状态下的相应检测,这四个方面有所研究,有所分析。希望能够通过本文的研究工作,使得继电器保护相关二次回路的在线状态检测技术的应用水平得到提高。     

Cisco CNA在企业网络配置与管理中的应用

企业在不断发展壮大时,其网络需求也随之不断增长,越来越多的业务系统需要依托于IT环境进行日常办公管理和业务管理。网络环境的搭建离不开交换机的使用,在实际工作中我们引入了CiscoCNA网络配置与管理工具来辅助网管员对交换机进行有效的配置与管理,大大提高工作效率。     

大气对流边界层光传输的实验室模拟

利用湍流池模拟大气对流边界层的光传输,同时测量了到达角起伏和光路上的温度脉动。结果表明,在混合层的上部,对数温度谱偏陡,和大气中的观测结果一致,到达角起伏谱也偏陡,但到达角起伏谱曲线反映了湍流在小尺度范围内具有各向同性的特征,此时利用温度脉动方法得到的折射率结构常数小。当边界层顶部逆温层消失,发展为完全对流状态时,温度谱幂率等于“－5／3”,到达角起伏谱害虫率等于“－8／3”,两种方法测量得到的折射率结构常数一致。