35 research outputs found
基于互联网的财务报告模式
我国证监会1999年修订的《公开发行股票公司信息披露的内容与格式准则第2号——年度报告的内容与格式》规定,2000年以后,上市公司应将年度报告的全文登载于证监会指定的国际互联网网站上。上海证券交易所和深圳证券交易所已在2000年4月30日首次成功地实现了959家上市公司1999年报的网上披露,2000年6月27日,上海证券交易
Carboxyl-Containing Polysiloxane Use in Metal Removal
本文研究了含羧基聚硅氧烷对部分金属离子的去除效果;探讨了去除金属离子的机理和影响因素.实验结果表明.这种聚硅氧烷对Cu(2+)、CA(2+),fE(3+)、和Hg(2+)等离子有明显的去除效果;其去席离子的量随羧基含量的增加而增加;在混合金属离子溶液中有选择地去除Hg(2+)、fE(3+)和CA(2+)离子;当体系的PH值在8~10,温度为40℃时,具有最佳的去除效果.The eFFectiveness of removal of some metal ions by carbexyl-containing polysiloxane was studied.The experimental results inducated that.these polysiloxanes are eFFectively For removal of Cu2+,Ca2+,Fe3+ and Hg2+ and selective remove Hg2+, Fe3+ and Ca2+ From several metals-containing solutions.The removal capacity was increased with the increasing of carboxy group content of polysiloxane.The maximum removal was obtained with .pH=8~10 at 40℃
Synthesis and Properties of Aryloxy-terminated Polydimethylsiloxanes
通过酚类与六甲基环三硅氧烷(d3)的调聚反应,首先合成了一类含芳氧端基的聚二甲基硅氧烷(AOS).采用uV、Ir、1HnMr、元素分析、分子量测定等方法,确证了所合成聚合物的结构.讨论了反应试剂摩尔比和反应条件对调聚产物分子量的影响;研究了AOS的结构与杀菌功能、絮凝作用以及水解速度的关系.Aryloxy-terminated polydimethylsiloxanes(AOS) were synthesized by the telomerization of hexamethylcyclotrisiloxane (D3) with phenols.The structures of AOS were characterized by UV, IR, 1HNMR and elemental analysis.Molecular weight of the polymer varies on dependence of the reaction conditions and the mole rations of the reactants was analyzed.AOS's structural inFluence on bactericide, Flocoulation and hydrolysis were studied
超微型涡轮中极低展弦比静叶栅流场特性的数值研究
通过数值求解柱坐标系下三维定常粘性雷诺时均N—S方程,结合RNG k-ε湍流模型和非平衡壁面函数,获得了超微涡轮中极低展弦比静叶栅流道内部的三维稳态粘性流场,揭示了其独特的流场物理特性和气动损失规律.结果表明:超低展弦比涡轮叶栅中存在双二次流现象;尽管超微燃气涡轮静叶栅高度仅为1.3mm,壁面影响区占叶高的总高度仍不超过3%;叶片的静压载荷主要由中部弧段承担;总压损失主要发生在近壁区,尤其是吸力面近壁区;静叶栅径向各截面最大马赫数并不是出现在主流中央,而是介于主流中央和壁面之间的一个狭小区域,这可能与通道低能二次流与主流的掺混作用有关
Research Report on the Textbook Construction and the Design for Textbook in an Organic Whole Way for Computer Science and Technology in Universities
1 引言自从计算机科学与技术学科专业教育诞生之日起,学术界就开始了长期的、连续的教材创作工作,陆续推出了各式各样的教材。在中国,伴随着高等学校学科专业教育的兴起,采用翻译、编译、编写、编著、引进、创作等多种形式,大量专业教材不断地进入这个领域。众所周知,无论是国内还是国外,长期以来学科专业教材的建设确实为培养一大批专业人才做出了巨大的贡献。然而,当人类进入21世纪,高等教育面临着学科不断深化和社会深刻变化带来的各种挑战时,如果我们怀着创新的冲动和理性的心态,带着冷峻的目光和挑剔的眼神审视高等学校学科专业办学现状和过去业已出版的大量教材,期望冲破高等学校学科专业教育现有的模式,通向自由、As the framework of theoretical systems on education for computer science and technology in universities is advanced by the project 13-22 group, it will be feasible to make the extensive mode and experienced running a major way into the intensive mode and scientific one way for the education of computer science and technology. One of the kernel problems is how to construct a series of advanced textbooks during implementation of the transformation. The problem is answered systematically and a design scheme for these textbooks in an organic whole way is given in this paper.教育部教育与教学改革13-22、C014;; 厦门大学科学基
Silicone Initiators
[中文文摘]介绍了有机硅引发剂的种类、结构、性能及制备方法 ;阐明了引发剂在特定结构高分子合成中所起的重要作用。[英文文摘]The types , st ructure , properties , preparation , as well as the application in the synthesis of functional polymer of silicone initiators were introduced in this paper
