期刊文献+
共找到7篇文章
< 1 >
每页显示 20 50 100
开链羰基化合物优势构象的研究
1
作者 雷光东 黄成华 《内江师范学院学报》 2002年第2期11-18,共8页
化合物的官能团决定其化学反应 ,而分子的优势构象决定着化合物立体化学行为 ,对羰基周围各非键联原子间相互作用的研究 ,可推导出其优势构象的规律 。
关键词 开链羰基化合物 优势构象 几率 位阻 官能团 主体化学 化学反应 α碳原子 取代醛基 酮类化合物
下载PDF
树状大分子:一类新型的纳米容器和输送装置 被引量:1
2
作者 陈双玲 叶玲 《国外医学(药学分册)》 2004年第3期181-184,共4页
与传统的线性高聚物相比 ,树状大分子和超支化高聚物是一类相关的具有独特分子结构及大小的新型材料。本文详述了近年来这些高聚物作为新型聚合物输送体系应用方面的重要进展。超支化的药物输送装置领域目前正在快速发展成熟 ,同时由于... 与传统的线性高聚物相比 ,树状大分子和超支化高聚物是一类相关的具有独特分子结构及大小的新型材料。本文详述了近年来这些高聚物作为新型聚合物输送体系应用方面的重要进展。超支化的药物输送装置领域目前正在快速发展成熟 ,同时由于在药物 包合物系统的研究中的重大发现而备受关注。本文也介绍了具有理想的超支化结构的树状大分子在主体 客体化学中的应用。 展开更多
关键词 树状大分子 超支化高聚物 药物输送装置 主体-客体化学
下载PDF
Identity, the Main Term of Contrast between "Globalization" and "Universalization" An Interpretention with a Critical Linguistic Approach
3
作者 Mohammad Tohidfam Maryam Khosravi Baraghani Shahab Dalili 《Journal of Philosophy Study》 2016年第3期155-161,共7页
Communicational and international developments have different aspects in today's world so that some terms like "Internationalization," "Liberalization," "Universalization," "Westernization," "Deterritorializ... Communicational and international developments have different aspects in today's world so that some terms like "Internationalization," "Liberalization," "Universalization," "Westernization," "Deterritorialization" find interferences in social sciences and humanities studies. But these terms can generally be distinguished by two different categories of study as some experts have emphasized that the above developments are in the process (Globalization) while the others considered them on the project (To Globalize). The main problem is that how we can find out the focal point of both studies through which the accuracy of these claims to be verified to know whether contemporary changes and evolutions are formed in a process or a project. It seems that the focal point in the sphere of both claims (processes and projects) is the issue of "identity" since both spheres agree that the concept of "identity" has passed a series of changes and developments, although each one renders the path and goal of "identity" changes by its own specific interpretations. In this article, we claim that using linguistic approach we are able to review the developments and evolutions' flow of identity in the present era and thereby it can be found that the developments in information and communication would lead to creating a process in the context of Globalization or a project on Universalization. The assumption of this study is that by explanation of the above-mentioned situation, we can see that based on the linguistic approach, the process of making identity is "context-based" and "conditional" as opposed to a project view formation and relative continuity of identification process would generally be subject to the condition. 展开更多
关键词 IDENTITY GLOBALIZATION UNIVERSALIZATION LINGUISTICS proximity conditionality and contextualism
下载PDF
Green House in Semi-arid Regions of Mexico
4
作者 Maria de los Angeles Rechy Carvajal Emil von Roth Jose Alberto Murillo Rodriguez 《Journal of Environmental Science and Engineering(B)》 2016年第5期224-227,共4页
The subject structure was consisted of a proto-type house with plan dimensions of 8 m ×4 m. A variety of materials was used to the construction, with special emphasis on using environmentally friendly non-toxic m... The subject structure was consisted of a proto-type house with plan dimensions of 8 m ×4 m. A variety of materials was used to the construction, with special emphasis on using environmentally friendly non-toxic materials. The structure's core consisted of reinforced concrete frames with masonry infill walls. Inside faces of the walls and the roof's outside face were covered with proprietary composite panels, which are manufactured with a mixture of cement, volcanic ash, and local sawmill waste. These panels were analyzed for their physical and chemical properties, as well as for their resistance to decay and insects when subjected to extreme conditions for 15 years. The panels have also shown to provide thermal insulation and nonflammable when in direct contact with fire. The roof surface was further covered with a blend of local drought-resistant succulents and cacti. This study provides a detailed review of the construction process and materials employed. 展开更多
关键词 Prototype house thermal insulation non-combustible resistant to decay.
下载PDF
Research on Present Situation and Countermeasure of Identity Recognition among Current College Students towards Socialist Core Value System
5
作者 Xue Lei 《International English Education Research》 2015年第1期69-71,共3页
The value identity emphasizes the harmony and consistency between the different value concepts. In general, it includes three stages, namely cognition, internalization and externalization. By the investigation on the ... The value identity emphasizes the harmony and consistency between the different value concepts. In general, it includes three stages, namely cognition, internalization and externalization. By the investigation on the present situation of college students' socialist core value system identity, it can be found that, at present, there is a good development momentum of our country's higher vocational school students' thoughts in general. But it also exists some problems that can't be ignored. Therefore, the top priority should be focused on the students' physical and mental characteristics. We should reform the current education methods gradually, steadily enhance the college students' identity, emotion and behavior cognition of socialist core value system, and gradually strengthen the ideological construction of college students, so as to make them better serve the socialist modernization. 展开更多
关键词 College Students Socialist Core Values IDENTITY PRACTICE
下载PDF
富勒烯的超分子体系研究进展
6
作者 徐祥云 朱丽琴 +1 位作者 周林宗 刘立平 《工业技术创新》 2018年第1期96-101,共6页
富勒烯是碳的第七种同素异形体。在超分子体系中,富勒烯既可以作为主体也可以作为客体。作为主体,它们具有与石墨烯相似的插入行为;也可以把物种包结在其闭合的腔内,形成金属内嵌富勒烯、金属氮化物内嵌富勒烯等。作为客体,富勒烯代表... 富勒烯是碳的第七种同素异形体。在超分子体系中,富勒烯既可以作为主体也可以作为客体。作为主体,它们具有与石墨烯相似的插入行为;也可以把物种包结在其闭合的腔内,形成金属内嵌富勒烯、金属氮化物内嵌富勒烯等。作为客体,富勒烯代表一个大的缺电子模板,可以与富π电子化合物和大环化合物形成包结分子体系。氢键、π-π堆积作用、静电力、范德华力和金属配位作用,均是实现富勒烯超分子自组装的驱动力。多种超分子作用力的协同、富勒烯基自组装聚集态体系的优化,是富勒烯的未来研究热点。 展开更多
关键词 富勒烯 超分子 主体化学 客体化学 自组装
原文传递
Cocrystallization of N-donor type compounds with 5-sulfosalicylic acid:The effect of hydrogen-bonding supramolecular architectures 被引量:8
7
作者 WANG Lei XU LingYan +3 位作者 XUE RuiFeng LU XiFeng CHEN RuiXin TAO XuTang 《Science China Chemistry》 SCIE EI CAS 2012年第1期138-144,共7页
Benzotriazole,N,N'-dimethylpiperazine and N-methylpiperazine were applied to crystallize with 5-sulfosalicylic acid(5-H2SSA),affording three new binary molecular cocrystals [(C6H6N3+).(C7H5O6S-)].H2O(1),[(C6H16N22... Benzotriazole,N,N'-dimethylpiperazine and N-methylpiperazine were applied to crystallize with 5-sulfosalicylic acid(5-H2SSA),affording three new binary molecular cocrystals [(C6H6N3+).(C7H5O6S-)].H2O(1),[(C6H16N22+)1/2.(C7H5O6S-)].H2O(2) and [(C5H14N22+).(C7H5O6S-)2].3H2O(3) under general conditions.Proton-transferring occurs from acid to nitrogen of N-donor compounds in all compounds 1,2 and 3.Analysis of the hydrogen-bonding synthons and their effects on crystal packing were also presented in the context of crystal engineering and host-guest chemistry.In compound 1,1-D infinite chains are extended to a 2-D layered architecture via strong O-H...O hydrogen bonds and then to a 3-D network by N-H...O interactions.Compound 2 and 3 both have the 1-D chain which is formed by O-H...O bonds and weak C-H...O hydrogen bonds.A common intramolecular S(6) [synthon I] ring is formed by the hydroxyl with the carboxyl group in all three compounds. 展开更多
关键词 crystal engineering supramolecular synthons N-donor compounds 5-sulfosalicylic acid
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部