化合物[Sr2（C30H30N20O10）（H2O）4Cl]Cl·[C6H4（OH）2]2·6H2O的合成和晶体结构

合成了瓜环与氯化锶及间苯二酚形成的化合物,其结构为单晶X-射线分析方法所确定.晶体属于正交晶系,空间群为P2(1)2(1)2,其中α=15.658(3)(A),b=11.522(2)(A),c=15.031(3)(A),Mr=1481.28.V=2711.6(8)A3,Z=4.Dc=1.814 g/cm3,μ=2.172,F(000)=1520,R=0.0627,wR=0.1710.在此化合物的结构中,主体分子瓜环的空腔内包有一个氯阴离子.     

N-邻苯二甲酰-L-苯丙氨酸的合成及结构表征

合成了标题化合物N-邻苯二甲酰-L-苯丙氨酸(C17H13NO4),并通过X-射线衍射对其结构进行了表征.晶体数据表明,该化合物单晶属于正交晶系,空间群为P21,晶胞参数为a=9.516(3)(A),b=5.8314(16)(A),c=13.008(4)(A),α=90.00°,β=92.710(5)°,γ=90.00°,Z=2.标题化合物中邻苯二甲酰亚胺部分和苯环之间的二面角为136.1°,分子间存在弱的O-H…O和C-H…O氢键作用,使得单晶结构趋于稳定.     

2-羧甲硫基-4，6-二甲基嘧啶的合成、表征和晶体结构

合成了化合物2-羧甲硫基-4,6-二甲基嘧啶一水合物,C6H12N2O3S,并用元素分析、IR和1HNMR进行了相关的表征.此化合物的晶体应用X一射线单晶衍射法进行了结构分析.晶体为单斜晶系,空间群P21/n,a=7.654 3(10),b=10.744 1(13),c=13.267 9(17)(A),β=100.797(3)*.Z=4,V=1 071.8(2)(A)3,Dc=1.340 g/cm3,F(000)=456和,μ(MoKa)=0.763(λ=0.710 73 (A)).对于1 451个观察到的衍射点(I>2σ(I)),结构可以精修到R1=0.0591和wR2=0.154 3.所测得的晶体结构显示,在水和3个2-羧甲硫基-4,6-二甲基嘧啶分子之间,存在有3个分子问氢键.在分子中,S原子与2个C原子形成S-C键,其键长分别为1.765(3)和1.790(3)(A).     

配位聚合物Ni（2,6-PDC）2·3H2O的水热合成及晶体结构

采用水热合成法,用NiCl.26H2O和H2DPC合成了Ni(2,6-PDC).23H2O配位聚合物,并对其进行了元素分析和单晶X射线衍射结构测定。该配位聚合物结构属于单斜晶系,空间群为P2(1)/c。晶胞参数为:a=13.680(3)(A觷),b=10.045(2)(A觷),c=13.777(3)(A觷),β=115.20(3)°,γ=90.00°,Volume=1713.0(6)A觷3,Z=4,F(000)=880,Mr=442.71。在化合物结构中,镍为六配位结构,其中两个N和四个羧基氧分别来自于两个2,6-吡啶二甲酸。由于分子中的苯环间存在π键作用,化合物连接为二维结构。又由于分子中存在大量的氢键,使化合物拓展为三维结构。     

3-羧酸香豆素的合成,表征和晶体结构

应用Meldrum酸和2-甲氧基苯甲醛制备了3-羧酸香豆素(C10H6O4, Mr=190.15),并用元素分析﹑IR和1H NMR手段进行了表征. 化合物的晶体X-射线衍射分析表明,晶体为单斜晶系,空间群为P21/n, a=11.344(3), b=5.517(1), c=13.820(4)(A), β=106.31(1)°, V=830.1(4)(A)3, Z=4, Dc=1.521 g/cm3, F(000)=392 和μ(MoKα)=0.763 mm-1(λ=0.71073(A)). I＞2σ(I)的衍射数为1 466,最后结构精修因子为R1=0.037 8和wR2=0.1036. 晶体结构分析表明,在分子中存在有一个共平面和一个分子内H键.     

[{Ni(C_3H_(10)N_2)_2(H_2O)_2}{Ni(C_3H_(10)N_2)_2}{SiMo_(12)O_(40)}]_n·4nH_2O的合成与表征

在水热条件下,合成了一种一维链状化合物[{Ni(C3H10N2)2(H2O)2}{Ni(C3H10N2)2}{SiMo12O40}]n·4nH2O.采用元素分析、X射线单晶衍射方法对该化合物进行了结构表征.结果表明:该化合物属于单斜晶系,C/2c空间群;晶胞参数a=12.760(3)nm,b=21.840(5)nm,c=22.512(5)nm,α=90°,β=92.644(3)°,γ=90°,V=6 267(2)nm3,Z=8.     

环丙沙星晶体结构

在水热条件下,以Co(NO3)·6H2O、环丙沙星、对羟基苯甲酸为反应物,得到了晶体(C41H44F2N8O15).晶体的晶胞参数为a=10.0226(4)(A),b=13.4560(5)(A),c=16.3134(6)(A),α=98.030(2)°β=92.944(2)°,γ=111.008(2)°,V=2021.4(2)A3,Z=2,Dc=1.523 mg/m3.     

锌配合物ZnL(PMA)0.5·1.5H2O的合成、晶体结构

通过水热合成法合成了配位聚合物ZnL(PMA)o.5·1.5H2O(1),其中H4 PMA为均四苯甲酸,L为4,4′,4”-(1H-咪唑-2,4,5-三基)三吡啶.用单晶X-ray衍射法测定了它的晶体结构,该晶体属单斜晶系,空间群P2(1)/c,a=10.465(9),b=9.818(4),c=20.558(3)(A),p=92.85(4)°,V=2109.92 (A)3,C23H17N5O5.5Zn,Mr=516.82,Z=4,Dc=1.846g/cm3,F(000)=1032.0,R=0.0491,wR=0.1113(Ⅰ＞2ó(Ⅰ)),2 471个可观测衍射点.该分子为配位聚合物,锌原子位于由2个L配体氮原子和2个均四苯甲酸羧酸氧原子构成的四面体中.结构分析表明,这种配位聚合物通过分子间氢键形成了一种新型的三维网络互穿结构.     

超分子C14H14N4O8的合成及结构表征

以反丁烯二酸和咪唑为原料,采用缓慢蒸发溶剂法合成了新的有机加合物C14H14N4O8,并获得了其单晶体.通过红外、热化学分析、X-射线单晶衍射等技术对该加合物进行了结构测定和性质表征.晶体中分子通过分子间氢键相互连接构成超分子网络结构.该加合物属于三斜晶系,P-1空间群,a=0.746 77(15), b=7.736 3(15),c=8.405 5(17),α=69.73(3)°,β=80.40(3)°,γ=66.19(3)°,Z=1,V=416.75(14)A3,D=1.468 (mg/m3),F(000)=190.     

[Ni(C18H22N2O4)·2CH3OH]的合成和晶体结构

合成了配合物[Ni(C15H22N2O4)·2CH3OH],其结构通过元素分析和X-射线单晶衍射分析确定.中心原子Ni(Ⅱ)与两个氮原子和四个氧原子配位,形成扭曲的八面体结构.标题化合物(C20H28N2NiO6,Mr=45.15)属于,空间点群Pna2(1),晶体学参数a=10.0489(16)(A),b=21.020(3)(A),c=9.9769(16)(A),α=β=γ=90°,V=2107.4(6)(A)3,Z=4,Dc=1.422Mg·m-3,μ(MoKα)=0.959 mm-1,F(000)=952,and R1=0.025 8,wR2=0.062 8.     

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.     

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