A Highly Energetic N‐Rich Metal–Organic Framework as a New High‐Energy‐Density Material

Metal–organic framework (MOF)‐based energetic material [Cu₃(MA)₂(N₃)₃] ( 1 ; MA=melamine) was synthesized and structurally characterized (47.55 % N). The structural analysis revealed the existence of unusual multiwalled tubular channels and interweaving of single and double helical units in 1 . The standard molar enthalpy of formation was found to be 1788.73 kJ mol^?1, which is the highest value among previously reported MOF‐based energetic materials. The calculated detonation properties showed that 1 can be used as a potential explosive. Sensitivity tests revealed that 1 is insensitive and thus can function as a high‐energy‐density material with a favorable level of safety.     

一种基于李代数的密码体制

在非交换群上提出一个基于李代数(n李代数)的密码体系.同时在复数域上,利用典型的非结合、反交换的李代数实现密码学上的一些结果.本文指出李代数乘法表的构造问题可以转化为求解多变元二次多项式不定方程组,是非确定性多项式(NPC)完全困难的.乘法表自然地导出一个单向陷门函数.在这个陷门函数的基础上建立了一个加解密方案.基于李代数给出了一个密钥分配方案.最后将结果推广到数域F上的n李代数.     

Lanthanide Amide-catalyzed Aza-Henry Reaction of N-Tosyl Imines with Nitroalkanes

In the presence of 10 mol% lanthanide amide [(Me₃Si)₂N]₃Ln(µ‐Cl)Li(THF)₃, the aza‐Henry reaction of N‐tosyl imines with nitroalkanes (1:5 molar ratio) could be performed in good yields. The lanthanide amide‐catalyzed aza‐Henry reaction has the features of mild reaction conditions, tolerance of a variety of aromatic aldehyde‐derived imines and nitroalkanes, short time and good chemical yields. A catalytic mechanism for the reaction was also proposed.     

Gene Manipulation Based Selenium-containing Peptide Exhibiting Synergism of SOD and GPx

In this paper, we constructed a novel bifunctional superoxide dismutase（SOD）/glutathione peroxi- dase（GPx） mimic, a selenium-, copper-containing 35-mer peptide conjugate（Se-Cu-35P） in which a three-amino acid linker（（31y-Asn-Gly） connects the C-terminus of 17-mer polypeptide SOD mimic with the N-terminus of 15-mer po- lypeptide GPx mimic. The SOD and GPx activities of Se-Cu-35P are two orders of magnitude lower than those of natural SOD and GPx, respectively. It provides a GPx activity 56-fold higher than Ebselen（a well-known GPx mimic）. The glutathione（GSH） binding constant is 5.6× 10^2 L.mol 1. Se-Cu-35P synergistically resists against the inactivation by H202 and protects the mitochondria from oxidative damage in a dose dependent manner. These results highlight the challenge of generating an efficient SOD/GPx synergism mimic. It could facilitate the studies of the cooperation of GPx and SOD and could be a potential therapeutic agent for the treatment of ROS-mediated diseases,     

The seventeen- and eighteen-electron metallacarbaboranes [1,1,1-(CO)3-2-Ph-closo-1,2-MnCB9H9]n- (n = 1, 2): a structurally characterized,redox-related pair

An eleven-vertex manganese-monocarbaborane dianion, upon one-electron oxidation, gives a stable radical monoanion in which the unpaired electron is delocalized over the cluster.     

Time Jitters in Multiple-Core Fiber

Property of soliton propagation is analyzed by using self-companying operator method in every core of multiple-core fiber. The results show that the time jitters of soliton transmission in every core relate to the relative phase among the input solitons in multiple-core fiber.     

大学物理实验课教学初探

本文对大学物理实验教学进行了改革初探,并结合实验教学特点,对学生行为和实验操作有了新观点,收到了良好效果。     

复合润滑气体止推轴承静态特性数值模拟分析

平面螺旋槽气体止推轴承由于加工困难限制了其推广使用,袋式止推轴承具有与螺旋槽气体止推轴承接近的较高承载能力,加工简单,受到很大的重视。建立了一种袋式止推轴承的数值模拟模型,利用流体力学模拟软件FLUENT对气膜压力场的分布进行了数值模拟研究,分析了该结构参数对轴承静态性能的影响规律。     

Highly regio- and stereoselective synthesis of tetrasubstituted olefins by the three-component tandem reaction of allylzinc bromide, acetylenic sulfone, and halohydrocarbon

[reation: see text]. Tetrasubstituted olefins containing a 1,4-diene structural unit can be regio- and stereoselectively constructed in one pot by the allylzincation of acetylenic sulfones, followed by Negishi cross-coupling with halohydrocarbons in the presence of catalytic Ni(PPh3)2Cl2.     

Encapsulation of an Interpenetrated Diamondoid Inorganic Building Block in a Metal–Organic Framework

The first example of an inorganic–organic composite framework with an interpenetrated diamondoid inorganic building block, featuring unique {InNa}_n helices and {In₁₂Na₁₆} nano‐rings, has been constructed and structurally characterized. This framework also represents a unique example of encapsulation of an interpenetrated diamondoid inorganic building block in a metal–organic framework.