CL-20/NQ复合含能微球的制备及其表征

为了降低CL-20感度,采用喷雾结晶工艺将钝感炸药NQ包覆在CL-20表面,制备CL-20/NQ复合含能微球。使用扫描电子显微镜(SEM)、差示扫描量热法(DSC)、X-射线衍射(XRD)、撞击感度仪对其形貌、热稳定性、晶型、撞击感度进行测试分析。结果表明:NQ呈球体团聚,并成功地包覆在CL-20表面,所得CL-20/NQ复合颗粒为球形,粒径约为20μm,包覆后CL-20晶型保持为ε型,与CL-20原料相比,CL-20/NQ复合含能微球的活化能提高了72.62 k J/mol,热稳定性大大提升,撞击感度与CL-20原料、CL-20/NQ简单混合物相比,特性落高分别提升32.65 cm、10.9 cm,机械感度降低。     

那格列奈的多晶结构与降血糖作用

用X射线衍射法对那格列奈的多晶型结构进行了测定,并进行了动物模拟降血糖试验.结果表明:那格列奈具有B晶型、H晶型和S晶型三种结构.H晶型为三斜晶系,晶胞参数a=1.769 9(7)nm,b=2.719 1(8)nm,c=1.267 0(6)nm,α=61.75(3)°,β=73.11(6)°,γ=66.77(7)°,V=4.895 nm3,Z=10.S晶型为正交晶系,晶胞参数a=2.317 8(6)nm,b=2.533 2(5)nm,c=0.653 1(2)nm,α=β=γ=90°,V=3.835 nm3,Z=8.小白鼠模拟降糖试验表明:与目前上市的H晶型相同,S晶型也具有很好的降血糖作用,特别是在用药40 m in时,效果更显著.     

CL-20/TNT/DNB三元共晶的分子动力学模拟

为了探索研究CL-20(六硝基六氮杂异伍兹烷)/TNT(2,4,6-三硝基甲苯)/DNB(1,3-二硝基苯)三元共晶形成的可能性,分别构建了CL-20/TNT/DNB三元共晶结构和CL-20/TNT、CL-20/DNB组成的二元共混物结构,以及CL-20、TNT、DNB三元混合结构。采用分子动力学方法模拟计算了三元共晶体系、二元共混体系和三元混合体系的结合能、内聚能密度、径向分布函数和力学性能。对计算结果进行比较和分析可以得到:CL-20/TNT/DNB共晶结构的结合能大于CL-20/TNT/DNB共混结构、CL-20/TNT与CL-20/DNB二元共混结构的结合能;CL-20/TNT/DNB共混结构、CL-20/TNT与CL-20/DNB二元共混结构内聚能密度小一些,即共混体系克服分子间作用力相对容易,体系稳定性较差;而CL-20/TNT/DNB共晶结构的内聚能密度大一些,体系中分子间的相互作用力较强,体系结构稳定性较好,共晶体系中存在作用强度大、长度也小的氢键作用,有利于CL-20/TNT/DNB共晶体系的形成,对体系感度的降低也有一定意义。     

一种新型超分子化合物[(C_2N_2H_4)_2Mo_(36)O_(128)]·19H_2O的制备与光催化性能研究

通过选用铜乙二胺硫酸盐作为反应配体与Anderson型多酸Na_4(H_2O)_7[FeMo_6O_(24)H_6]·2H_2O在室温条件下进行反应,得到了一个结构新颖的超分子型化合物[(C_2N_2H_4)_2Mo_(36)O_(128)]·19H_2O.并通过X-射线衍射、红外光谱以及元素分析等手段表征了所得到的化合物的晶体结构,从所得到的数据我们能够判断化合物晶系为单斜,空间群为C 2/c.晶体学数据如下:a=40. 083?,b=19. 860?,c=25. 629?,α=90°,β=124. 39°,γ=90°,V=16835. 4?~3,Z=4,R1=0. 0732,R_2=0. 1876,GOF=1. 012.一个{Mo_(36)}多阴离子通过两个{Mo_(17)}单元经由两个{MoO_2}~(2+)连接而成,其中心形成了一个大的孔道结构.同时,孔道结构中还存在两个游离的乙二胺配体.由它们共同构成了一个新型的超分子结构.{Mo_(36)}结构单元间通过四个氧原子之间的氢键连接.通过对其光催化性质进行研究,发现所合成的晶体化合物对降解RHB有较高的催化活性.     

基于刚性配体2,3-萘吩基-苯并吡嗪的两个超分子化合物的合成、结构及性能研究

本文中使用Keggin型多金属氧酸盐,在水热条件下刚性配体2,3-萘吩基-苯并吡嗪(npz)的自组装获得两个超分子化合物:[(npz)_4SiMo_(12)O_(40)]·H_2O (1)和[(npz)_4SiW_(12)O_(40)]·4H_2O(2),并使用XRD、FT-IR对化合物的结构进行了确定表征.化合物1是三斜晶系,P-1空间群,晶胞参数a=13.0262(4) ?,b=15.5354(5) ?,c=21.6300(7)?,α=80.010°,β=81.513°,γ=73.782°,V=4116.5(2) ?~3,Z=2,R_1=0.0354,R_2=0.0945.化合物2是三斜晶系,P-1空间群,晶胞参数a=11.977(5) ?,b=12.742(5) ?,c=14.108(5)?,α=94.098°,β=103.781°,γ=97.135°,V=2063.4(14) ?~3,Z=1,R_1=0.1174,R_2=0.2796.两个化合物中不同的结合方式形成了不同的超分子结构.同时也对化合物1和2的电化学性质和光催化性质进行了研究.制作电极1-CPE和2-CPE检测溴酸钾,并在紫外可见光下检测了化合物1和2对有机染料的催化降解活性.结果表明化合物1和2具有较好的电化学和光催化性能.     

高能量密度化合物2,4,7,9,11,12-六硝基-2,4,7,9,11,12-六氮杂-四环[8.4.0.0~(3,8).0~(5,6)]十二烷的理论研究（英文）

对2,4,7,9,11,12-六硝基-2,4,7,9,11,12-六氮杂-四环[8.4.0.0~(3,8).0~(5,6)]十二烷(笼型-RDX)进行了优化,得到了DFT-B3LYP/6-31G(d)水平上的分子几何和电子结构.根据计算所得密度和生成热(HOF),运用Kamlet-Jacobs方程评估爆轰性能.分子力学模拟所得晶体结构属于Pna2_1空间群,晶格参数Z=4,a=14.705?,b=7.416?,c=12.055?,ρ=2.214 g·cm~(-3).爆速10.35 km·s~(-1)和爆压50.85 GPa均优于六硝基六氮杂异伍兹烷(CL-20).根据高能量密度化合物(HEDC)的能量和稳定性定量标准,笼形-RDX基本上满足这一要求.这为新型高密度能量化合物的分子设计提供了基础信息.     

CL-20/HMX共晶含能材料研究进展

含能材料共晶化是获得高能低感含能材料的重要途径,不同含能材料形成共晶可以有效改善含能材料的氧平衡及感度,提高其爆热、作功能力及安全性等性能。CL-20/HMX共晶含能材料是高能低感共晶含能材料的代表,CL-20/HMX共晶既保留了CL-20的能量水平又降低了CL-20的感度,是解决CL-20应用问题的有效途径。本文通过对比CL-20/HMX共晶与CL-20及HMX性能上的差异,说明了CL-20/HMX共晶研究的必要性,并从CL-20/HMX共晶的制备方法、形成机制、性能及应用方面,综述了CL-20/HMX共晶研究的最新进展。重点对比了CL-20/HMX共晶制备方法的优劣,总结了CL-20/HMX共晶形成机制,分析了不同制备方法获得的CL-20/HMX共晶性能差异,评述了CL-20/HMX共晶的发展现状及应用前景。     

一个二维吡啶四唑基铜配位聚合物的晶体结构及染料吸附性能

选择氯化铜和刚性吡啶四唑配体为原料在水热条件下进行自组装,得到了一种新铜配合物材料[Cu(3-ptz)μ_2-OH],并通过单晶X-射线衍射,粉末X-射线衍射和红外光谱对其结构进行了表征.结构解析表明铜配合物属于正交晶系,空间群P b c a,V=1582. 57(16)?~3,a=14. 5955(8)?,b=6. 8134(4)?,c=15. 9140(9)?,α=90°,β=90°,γ=90°,Z=8,R_(int)=0. 0362,Dc=1. 911 g/cm~3,μ=2. 721 mm~(-1),F(000)=912,R=0. 1560,wR=0. 4928.结构解析证明,标题铜配合物是二维网状结构,而且可以在黑暗条件下快速吸附亚甲基蓝有机染料.     

双(2-苯并咪唑基)辛烷的合成及其晶体结构

以邻苯二胺和癸二酸为原料合成了双(2-苯并咪唑基)辛烷,其结构经1H NMR,IR,元素分析和x-射线单晶衍射表征.1属Monoclinic晶系,C2/c空间群,晶胞参数为:a=22.334(9)nm,b=9.638(4)nm,c=9.899(4)nm,a=90.00°,β=114.431(6)°,γ=90°,Dc=1.184g·cm-3,Z=4,最后一致性因子为R1=0.0923,wR2=0.2089.目标分子通过分子间N-H…N氢键作用相互堆积,形成空间三维结构.     

链状铜配合物[Cu(bipy)2Cl]2Cl2·nH2O (bipy=2,2''''-联吡啶)水热合成

利用水热合成方法制备了一种新颖的由π-π堆积形成的链状二价铜配合物[Cu(bipy)2Cl]2Cl2·nH2O(bipy=2,2'-联吡啶),并用单晶衍射仪测定了其晶体结构,在2K～300K之间测定其磁化率.结果表明:该化合物为单斜晶系,P2/ c空间群,a=1.232 8(3)nm,b=1.478 1(3)nm,c=1.431 1(3)nm,α=90°,β=108.51(3)°,γ=90°,V=2.473 0(9) nm3;8K～298K之间标题化合物呈现明显的铁磁性耦合相互作用,在2K～8K范围内却呈现出反铁磁性相互作用的特征.元素分析及红外光谱进一步佐证了化合物的结构.     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with