L-谷氨酸-5-乙酯及其金属配合物的合成、表征和催化活性

以L-谷氨酸为原料合成了L-谷氨酸-5-乙酯,并对其进行了X-射线单晶衍射测定.测量结果表明:L-谷氨酸-5-乙酯属单斜晶系,P2(1)空间群,其中a=9.691(3),b=5.2631(17),c=17.297(6);β=90.752(5)°.通过L-谷氨酸-5-乙酯分别与MgCl2.6H2O和Ca(OH)2反应,合成得到了Mg(II)和Ca(II)的金属配合物.比色法测试结果表明:L-谷氨酸-5-乙酯与镁和钙形成的配合物对三磷酸腺苷二钠的分解反应具有较好的活性.     

N，N-二羧甲基-L-谷氨酸金属配合物的合成、表征和催化活性

以L-谷氨酸为原料合成了N,N-二羧甲基-L-谷氨酸(H2bcmga),并对其进行了元素分析、IR、UV-Vis和1HNMR表征.通过N,N-二羧甲基-L-谷氨酸与MgCl2 ·6H2O、Ca(OH)2、MnCl2 ·4H2O、NiCl2 ·6H2O、CoCl2 ·6H2O、CuCl2·2H2O、ZnCl2反应,分别合成了相应的金属配合物.用比色法测试了N,N-二羧甲基-L-谷氨酸和7种金属配合物对三磷酸腺苷二钠分解的催化活性,结果表明:N,N-二羧甲基-L-谷氨酸与镁、钙和锰形成的配合物对三磷酸腺苷二钠的分解反应具有较好的活性.     

N,N-二苄基-L-谷氨酸及其金属配合物的合成、表征及生物活性

以L-谷氨酸为原料合成了N,N-二苄基-L-谷氨酸（H2bbga）,并对其进行了红外光谱、紫外光谱、核磁共振表征.通过N,N-二苄基-L-谷氨酸与MgCl2.6H2O、Ca（OH）2、MnCl2.4H2O、NiCl2.6H2O、CoCl2.6H2O、CuCl2.2H2O和ZnCl2反应,分别合成得到了相应的金属配合物.用比色法测试了N,N-二苄基-L-谷氨酸及7种金属配合物对三磷酸腺苷二钠分解的催化活性,结果表明：N,N-二苄基-L-谷氨酸与镁、钙和锰形成的配合物对三磷酸腺苷二钠的分解反应具有较好的活性.     

L-谷氨酸-5-甲酯金属铜化合物的合成、表征及生物活性

通过L-谷氨酸-5-甲酯与Cu（CH3COO）2.H2O反应,合成了相应的金属铜化合物[Cu（C6H10NO4）2].对L-谷氨酸-5-甲酯金属铜化合物的晶体进行了X-射线单晶衍射测定.结果表明：L-谷氨酸-5-甲酯金属铜化合物属单斜晶系,P2（1）空间群,其中a=9.5883（19）,b=5.1521（10）,c=15.562（3）;β=98.65（3）°.抗菌筛选数据表明,L-谷氨酸-5-甲酯金属铜化合物对枯草芽胞杆菌具有较好的抑制作用.     

2,4,8,10-四氮螺[5.5]-3,9-二(2-吡咯基)十一烷的合成及晶体结构

本文以季戊四胺与2-醛基吡咯合成了2,4,8,10-四氮螺[5.5]-3,9-二(2-吡咯基)十一烷(1),并通过单晶X-射线衍射方法进行了表征.该晶体属于三斜晶系,空间群为:P-1,相关晶胞参数为:a=8.386(2)(A),b=10.541(3)(A),c=0.779(3)(A),α=87.274(10)°,β=8...     

N-苄基-N’-三甲基硅基苯甲脒与钴（Ⅱ）配合物的合成及结构表征

N-三甲基硅基苄基氨基锂与笨甲腈反应合成了N-苄基-N'-三甲基硅基苯甲脒的锂金属有机化合物,其与二水合氯化钴(Ⅱ)反应得到了N-苄基-N'-三甲基硅基苯甲脒配体与钴(Ⅱ)配合物,用X-射线单晶衍射对其结构进行了表征,结果表明,该配合物属单斜晶系,空间群C2/c,晶胞参数a=20.281(8)(A),b=6.730(3)(A),c=28.488(12)(A),β=109.912(5)°,V=3656(3)(A)3,Z=4.     

含有氨基酸基团的聚(ε-己内酯)合成与表征

采用氨基酸钠游离的氨基引发ε-己内酯单体开环得到酯肽齐聚物,并以六亚甲基二异氰酸酯为扩链剂,将这些齐聚物扩链合成4种聚酯酰胺.将4种天然氨基酸(L-丙氨酸、L-亮氨酸、L-谷氨酸、L-赖氨酸)引入到聚(ε-己内酯)(poly(ε-caprolactone),PCL)中,合成和表征了4种含有氨基酸残基的聚合物.通过1H-NMR、FT-IR、水接触角、水吸收率和降解实验对该聚酯酰胺进行了表征.实验结果表明:经氨基酸改性PCL的亲水性和降解性得到了改善,其中含有L-赖氨酸残基的聚酯酰胺因亲水性最高,降解速率最快.     

铬（Ⅲ）-乳酸配合物的合成与结构表征

利用溶液法合成了[Cr2(HLact)6]配合物,同时对该配合物进行红外光谱、X-衍射等表征,结果表明:该配合物为三斜晶系,空间群为P-1,a =9.496(3) (A),b = 12.239(3)(A), c = 15.017(4)(A), (α= 96.873(5)0, (β=91.189(5)0, (γ= 92.312(6)0, V=1730.7(8)(A)3, Z=2.     

一种新方法合成吡嗪甲酸根合铜(Ⅱ)配合物

文章介绍了一种合成二水吡嗪甲酸合铜配合物[Cu(CPY)_2(H_2O)_2](CPY=吡嗪-2-甲酸根)的新方法,用吡嗪二甲酸为起始原料与二水乙酸合铜反应得到二水吡嗪甲酸合铜配合物,合成了以吡嗪-2-甲酸根为配体的单核铜(II)配合物[Cu(CPY)_2(H_2O)_2].对该配合物进行了元素分析表征,并对其进行了X-射线单晶结构测定.该单晶属于单斜晶系,空间群为P 2(1)/c,其晶胞参数为α=5.4447(11)(A)、alpha=90 deg;b=10.894(2)(A)、beta=98.23(3)deg、c=10.386(2)(A);gamma=90 deg,Volume=609.7(2)(A)3.     

一维链状有机锡配合物三丁基锡4-吡啶甲酸酯的合成及晶体结构

用三丁基氯化锡与4-吡啶甲酸钠反应,合成了三丁基锡4-吡啶甲酸酯,并进行了红外光谱、核磁共振氢谱及质谱表征。X-射线单晶衍射表明,化合物属单斜晶系,空间群P2_1/c,α=9.667 3(14),b=23.845(4),c=9.707(14)A;β=112.463(3)°;V=2 067.9(5)A,Z=4,Dc=1.324 Mg m~(-3),μ=1.242 mm~(-1),F(000)=848,R_1=0.054 4,ωR_2=0.141 1.化合物通过4-吡啶甲酸配体的氮原子桥联,形成五配位三角双锥构型的一维无限链聚合物。     

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.     

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.     

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.     

Perspherical Approaches for Electrons in Atoms and Charged Excitons in Quantum Wells

Instead of following Fock’s expansion,we solve the Schrodinger equation for some quantum mechanical manybody systems such as electrons in atoms and charged excitons in quantum wells in a similar way in hyperspherical coordinates by expanding the wave functions into orthonormal complete basis sets of the hyperspherical hannonics(HHs)of hyperangles and generalized Laguerre polynomials(GLPs)of the hyperradius.This leads the equation to     

Advances in broadband wireless communications under high-mobility scenarios

Future mobile communication systems aim at providing very high data transmission rates, even in high-mobility scenarios such as high-speed wheel-track trains, maglev trains, highway vehicles, airplanes, guided missiles or spacecraft. A particularly important commercial application is the strong and increasing worldwide demand for high- speed broadband wireless communications （up to 574.8 km/ h test speeds or 380 km/h commercial speeds） in railways, providing data, voice and video services for applications such as onboard entertainment services to passengers, train control, train dispatch, train sensor status handling and sur- veillance. In such high-mobility scenarios, there are a number of communication challenges, including fast hand- over, location updating, high-speed channel modeling, estimation and equalization, anti-Doppler spreading tech- niques, fast power control, and dedicated network architec- ture. Because signal transmission in very high-speed scenarios will inevitably experience serious deterioration, it is imperative to develop key broadband mobile communi- cation techniques for such high-speed vehicles.     

Wuhan University Journal of Natural Sciences TOTAL CONTENTS

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Scale-based spatial data model for GIS

Being the primary media of geographical information and the elementary objects manipulated, almost all of maps adopt the layer-based model to represent geographic information in the existent GIS. However, it is difficult to extend the map represented in layer-based model. Furthermore, in Web-Based GIS, It is slow to transmit the spatial data for map viewing. In this paper, for solving the questions above, we have proposed a new method for representing the spatial data. That is scale-based model. In this model we represent maps in three levels: scale-view, block, and spatial object, and organize the maps in a set of map layers, named Scale-View, which associates some given scales.Lastly, a prototype Web-Based GIS using the proposed spatial data representation is described briefly.     

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     

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-