一种新的多酸基化合物[(H5PMo12V2O46)(bpy)2]的合成、晶体结构和电化学性质

以钼-矾磷酸盐（PMo12V2O46^5-）和4,4′-联吡啶（bpy）为混合配体,水热合成了一种新的多酸基化合物[[（H5PMo12V2O46）（bpy）2]]（1）,并通过红外、热重和单晶X-射线衍射对其结构进行了表征。结果表明,该化合物属单斜晶系,P2（1）/n空间群,晶胞参数为：a=11.431（2）A,b=12.214（2）A,c=17.269（4） A,V=2351.6（8）A3,Z=2,R_1=0.0676,wR2=0.1986。同时,标题化合物的热稳定性和电化学性质也被研究。     

三维聚合物双(三丁基锡)戊二酸酯的合成及晶体结构

用三丁基氯化锡与戊二羧酸二钠以2:1摩尔比反应,合成了双（三丁基锡）戊二羧酸酯,并用元素分析、红外光谱、核磁共振氢谱及X-射线单晶衍射进行了表征和结构测定.X-射线单晶衍射法测定表明,化合物属单斜晶系,空间群为Cc,晶胞参数:a=13.984（3）,b=16.164（3）,c=16.894（3）A,β=107.457（3）°,V=3 642.9（11）A3,Z=4,Dc=1.251g/cm3,μ=1.394mm-1,R1=0.050 0,wR2=0.087 4,F（000）=1416.晶体结构中存在2种化学环境不同的三角双锥构型的锡原子,由于配体中2个羧基在不同方向的交联作用,使化合物呈现三维立体骨架结构,并且在骨架结构中存在沿a、b、c轴3个方向伸展的规则的大环直孔道.     

含硫、氮配位的二正丁基锡二(二苯基卡巴腙)合成及晶体结构研究

以乙醇钠作碱,用二正丁基二氯化锡或三正丁基氯化锡与二苯基硫代长巴腙反应,合成了二正丁基锡二（二苯基硫代卡巴腙）（m-Bu）2Sn（SN4C13H11）2.通过元素分析、红外光谱、紫外光谱和核磁共振氢谱对其结构进行了表征.用X-射线单晶衍射测定了该化合物的晶体结构.化合物为单斜晶系,空间群P21/c,a=2.021（7）nm,b=1.310 3（5）nm,c=2.817　1（10）nm,β=95.472（7）°,Z=8,V=7.428（5）nm3,Dc=1.330 g/cm3,μ=0.834 mm-1,F（000）=3 056,R1=0.057 5,wR2=0.095 9.化合物中,中心锡原子为六配位畸变八面体构型.     

一维链状结构的Co（Ⅱ）聚合物：[Co（BDC）（phen）（H2O）]n·3nH2O的晶体结构和水热合成

在水热条件下合成了金属-有机配位聚合物：[Co（BDc）（phen）-（H2O）n·3nH2O（BDC=1,4-bemenedicarboxylate,phen=1,10-phenanthroline）,并通过元素分析,IR光谱,TG和单晶X-射线衍射对其进行了表征。结构表明该化合物属于三斜晶系：P-1（2）空间群组;晶胞参数a=9．795（5）^°A,b=10．752（5）^°A,c=11．271（5）^°A,α=75．903（5）°,β=65．306（5）°,γ=86．042（5）°,V=1045．3（9）^°A3,C20H22CoN2O8,Mr=477．13,De=1．908g·cm^-3,μ（MoKa）=1．637mm^-1,Z=2,RI=0．1586,wR2=0．3906。该化合物表现出Z字连状结构。     

（E）-3-（2-呋喃基）丙烯酸的合成与晶体结构

以2-呋喃甲醛和乙酸酐为原料,在乙酸钾存在下,用相转移催化法合成了（E）-3-（2-呋喃基）丙烯酸,其结构经UV、IR、X-射线单晶衍射仪进行了表征．合成的目标化合物分子式为C7H6O3,分子量为138．12,晶体属于单斜晶系,C2／c空间群,晶胞系数为：a=18．993（6）A,b=3．8474（12）A,c=20．095（6）A,α=90．00°β=114．054°（4）,γ=90．00°,V=1341．0（7）nm^3,Z=8,Dr=1．368Mg／cm^3,F（000）=576,μ（MOK＼a）=0．71073．结构由直接法解出,最终偏离因子为R1=0．0645,wR2=0．1360,分子间通过弱的相互作用形成层状化合物．     

3,5-二苯基吡唑的合成与晶体结构

合成了3,5-二苯基吡唑,通过了元素分析、红外光谱和核磁共振氢谱对其结构进行了表征.用X-射线单晶衍射测定了该化合物的晶体和分子结构.化合物晶体为单斜晶系,空间群C2/c,晶胞参数a=16.942（2）,b=17.153（2）,c=17.658（2）,α=90°,β=109.600（2）°,γ=90°,Z=16,V=4834.4（12）3,Dc=1.555g/cm3,μ=0.073mm-1,F（000）=868,差值电子密度最高和最低峰为147和-307e.nm-3.     

一种双四唑亚胺基钴和铜异核配合物的合成、结构和性质

合成了一种钴和铜异金属配合物[Cu（pn）2Co2 （BTA）4 （pn）2]·4H2O,X-射线单晶衍射表明了该化合物是三核结构,属于单斜晶系,P21/n空间群,其晶胞参数如下：a=8.657 1（2）,b=13.666 7（3）,c=18.516 7（3）A,β=100.783 0（10）°,Mr=1 154.47,V=2 152.10（8）（A）3,Z=2,Dc=1.782 g·cm-3,μ=1.343 mm-1,F（000）=1 190.0,R=0.044 4,wR =0.107 9（Ⅰ＞2σ（Ⅰ））.在该化合物中,π-π作用和O-H…N,N-H…N和O-H...O氢键连接配合物单元和结晶水形成了三维超分子结构.并报道了该化合物溶液的荧光性质.     

松萝酸（C18H16O7）的晶体结构与DFT理论研究

以秦岭太白山地衣太白茶为原料,提取、分离其中的活性成分松萝酸.用高分辨快原子轰击质谱（HR-FABMS）确定了化学式,1H-NMR表征了分子结构,单晶X-射线衍射确定了晶体结构;并用Gaussian 03程序、密度泛函（DFT）方法计算了该化合物的优化结构、电荷分布、前线轨道能量及其组成.结果表明,该物质的晶体属于正交晶系,P2（1）2（1）2（1）空间群,a=8.007 4（11）A,b=18.818（3）,c=20.200（3）A,α=β=γ=90°,V=3 043.8（7）A^3,Z=8,Dc=1.503 g/cm^3,F（000）=144 0,μ（MoKa）=0.117 mm-1,R1=0.032 6,wR2=0.077 7.计算所得键长及键角与X-射线衍射结果基本相符,氢键和晶体结构一致.说明分子优化构型正确,计算方法可靠,可为进一步研究松萝酸的生理活性提供参考.     

一个新的二维超分子化合物Mn(PIP)2(N3)Cl的水热合成、晶体结构和荧光性质(PIP=2-苯基咪唑[4,5-f][1,10]菲啰啉

利用中温水热法合成了一种未见报道的二维超分子网络,Mn（PIP）2（N3）Cl（PIP=2-苯基咪唑[4,5-f][1,10]菲啰啉）,通过元素分析、IR、单晶X-射线衍射对化合物的结构进行了表征。结果表明该化合物属于正交晶系：P2／n空间群;晶胞参数：a=8．2864（6）A．b=9．7999（7）A,c=39．687（3）A,Z=4,V=3222．4（4）A^3,R1=0．0616,wR2=0．1847。每个Mn（II）与来自N3^-的一个N原子,一个Cl^-和来自两个PIP配体的四个N原子配位形成单核配合物。相邻的配合物单元通过π-π堆积作用进一步拓展成2D超分子网络。此外．该固态化合物在室温下表现出蓝色的荧光性质。     

Dawson结构［（C6H4N4）2·P2W18O62·11（H2O）］的合成、表征、晶体结构

由联咪唑与K6 P2 W18 O62· nH2 O合成了基于Dawson型杂多化合物[（ C6 H4 N4）2· P2W18O62·11（H2O）],并通过元素分析、X-射线单晶衍射仪、红外光谱等确定了该化合物的晶体结构．单晶结构解析结果表明晶体属单斜晶系,空间群为C2/C,晶胞参数：a＝2．26349（13）, b＝1．43798（8）, c＝2．19657（12）,β＝97．4400（10）,Z ＝4,V＝7．0893（7） nm3,R1＝0．0545,ωR2＝0．1540．化合物分子由一个P2 W18 O62阴离子、两个联咪唑和11个水分子组成．     

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.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

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.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

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