Thermal studies of novel molecular perovskite energetic material (C6H14N2)[NH4(ClO4)3]

(C6H(14)N2)[NH4(ClO4)3] is a newly developed porous hybrid inorganic-organic framework material with easy access and excellent detonation performances,however,its thermal properties is still unclear and severely hampered further applications.In this study,thermal behaviors and non-isothermal decomposition reaction kinetics of(C6H(14)N2)[NH4(ClO4)3] were investigated systematically by the combination of differential scanning calorimetry(DSC) and simultaneous thermal analysis methods.In-situ FTIR spectroscopy technology was applied for investigation of the structure changes of(C6H(14)N2) NH4(ClO4)3]and some selected referents for better understanding of interactions between different components during the heating process.Experiment results indicated that the novel molecular perovskite structure renders(C6H(14)N2)[NH4(ClO4)3] better thermal stability than most of currently used energetic materials.Underhigh temperature s,the stability of the cage skeleton constructed by NH4^+and ClO4^-ions determined the decomposition process rather than organic moiety confined in the skeleton.The simple synthetic method,good detonation performances and excellent thermal properties make(C6H(14)N2)[NH4(ClO4)3] an ideal candidate for the preparation of advanced explosives and propellants.     

三萜骨架功能分子

具有独特立体结构的三萜化合物是一类重要的生物活性天然产物,在消炎、降血脂、保肝护肾、抗菌、抗肿瘤、抗真菌等方面有着重要药用价值。利用其独特手性结构、亲脂性、生物活性以及生物相容性等特性,设计合成新型功能分子,可作为药物载体,发挥其识别功能以及用于医用材料等方面具有重要的作用。本文介绍了近年来以三萜为骨架设计合成的新型功能分子在离子、分子识别和自组装性能方面研究现状及其潜在的应用前景。     

Five new eremophilane derivatives from Ligularia sagitta

Ligulasagitins A-E (1-5), five new eremophilane-derived metabolites possibly formed via a Diels-Alder reaction in the biosynthetic process, were isolated from Ligularia sagitta Maxim. Among them 1 and 2 possess a novel C19 skeleton, 4 and 5 are two novel dimeric eremophilane type derivatives. Their structures were determined by extensive spectroscopic analysis and the structure of 2 was also confirmed by a single-crystal X-ray diffraction analysis. Furthermore, 4 and 5 showed weak cytotoxic activity against HL-60 (human promyelocytic leukemia) cells.     

基于苯并噻唑的新型双硼桥联梯形共轭骨架的合成、结构及其性质

设计合成了一个新型双硼桥联梯形分子.该有机分子拥有一个拓展的π共轭骨架结构.通过真空升华方法,得到了这个化合物的单晶.单晶X射线衍射分析表明该化合物拥有一个完全共平面的并七环梯形骨架.与每一个硼配位的米基基团可以有效地隔离发光单元,避免聚集诱导淬灭.化合物具有非常高的熔点和热分解温度,表明其拥有良好的热稳定性.电化学、光物理性质和理论计算研究表明,我们设计的双硼梯形共轭化合物在有机电子发光二级管器件中具有潜在的应用价值.因此,构筑了以该分子为发光层和电子传输层的器件,得到了不错的电致发光效果.     

中国近海儒艮骨骼的研究

根据捕自广西北海市近海的５头儒艮（３雌２雄）标本详细描述。中国近海产的儒艮体长２２１ｃｍ～２９３ｃｍ,最大体重４５５ｋｇ。椎式为Ｃ７＋Ｔ１８－１９＋Ｌ５＋Ｃａ２５－２９＝５５－６０。指式（不包括掌骨）为Ⅰ１,Ⅱ３,Ⅲ３,Ⅳ３,Ⅴ２。     

聚合物混凝土(PC)在机械行业的应用及分析

根据作者对聚合物混凝土的研究，提出改善其性能的一些看法，以求扩大ＰＣ材料在机械行业的应用范围。     

Object as Agent

Ｉｎｏｂｊｅｃｔｏｒｉｅｎｔｅｄｄｅｓｉｇｎ（ＯＯＤ），ｔｈｅｃｏｎｃｅｐｔｏｆｏｂｊｅｃｔｇｅｎｅｒａｌｙｒｅｆｅｒｓｔｏｔｈｅｏｂｊｅｃｔｏｆａｃｔｉｏｎ，ｗｈｉｃｈｉｓｉｔｓｎａｉｖｅＥｎｇｌｉｓｈｍｅａｎｉｎｇ（Ｔｈｅ‘ｏｂｊｅｃｔ’ｉｎ...     

马尔可夫骨架PERT网络的最长路径

本文利用马尔可夫骨架过程理论研究PERT网络模型，其中网络各弧线的长度是相互独立的随机变量。文中构造了一个马尔可夫骨架过程，利用其向后方程求解随机网络最长路径长度的分布函数。     

Determining Causal Skeletons with Information Theory

Modeling a causal association as arising from a communication process between cause and effect, simplifies the discovery of causal skeletons. The communication channels enabling these communication processes, are fully characterized by stochastic tensors, and therefore allow us to use linear algebra. This tensor-based approach reduces the dimensionality of the data needed to test for conditional independence, e.g., for systems comprising three variables, pair-wise determined tensors suffice to infer the causal skeleton. The only thing needed is a minor extension to information theory, namely the concept of path information.     

微生物合成黄酮类化合物的研究进展

目前,工业生产黄酮类化合物面临价格昂贵等一系列问题,因此用微生物廉价生产黄酮类化合物具有重要意义。近年来系统代谢工程的出现,提供了一个全新的角度来解决传统受限制的生物工业过程。介绍了利用代谢流调控、强化前体物质积累等代谢工程策略,实现微生物法生产黄酮类化合物的国际研究状况,希望对解决目前大规模生产黄酮类物质存在的限制和挑战提供参考。