非水体系中磷酸镓大单晶合成与结构

非水体系中制备了GaPO4单晶,用X射线测定晶体结构的方法对化合物进行了表征.晶胞参数α=0.490 8lnm,b=0490 8lnm,c=1.1.106nm,α=90°,β＝90°,γ=120°.结构中的镓和磷均与氧形成四面体配位,骨架中的氧为二桥氧.无Ga-P连接方式,质子化的乙二胺阳离子未在孔道中.     

Au（PPh3）4ClO4的两种晶体与分子的结构

Au(PPh_3)_4ClO_4 的晶体有两种三方晶系构型,一种的空间群为R_3,a=b=c=1.186 3 nm,α=β=γ=73.82°;另一种的空群是 R3=b=c=898 6 nm,α=β=γ=44.13°该络合物分子本身具有三次轴的对称性,由于配体的空间位阻很大,因而它们与中心金原子的结合较松散,相互间的位置较不确定。     

奥氏体不锈钢1Cr18Ni9Ti车削条件优化的试验研究

车削奥氏体不锈钢所用刀具最佳硬质合金牌号为798;刀具最佳几何参数为:γ_0=10～20°,α_(?)=8～12°、λ_s=-5～-12°和bγ_1=(0.10～0.14)mm,γ_(01)=-10～-12°、b_e=0.10mm;通过一次回归正交试验获得计算最优切削速度的经验公式:υ=357.9f~(-0.51)f~(-0.38)αp~(-0.24)。     

(C12H8N2)2MnCl2晶体的水热合成与表征

用水热方法合成(C12H8N2)2MnCl2晶体,并用X射线衍射仪对其结构进行表征.该晶体属单斜晶系,P21/c空间群,a=0.9472(2)nm,b=1.52036(11)nm,c=1.4527(2)nm,α=γ=90°,β=98.96(2)°,V=2.0664(6)nm3,Z=7.     

非水体系中磷酸镓大单晶合成与结构

非水体系中制备了GaPO4单晶,用X射线测定晶体结构的方法对化合物进行了表征.晶胞参数a=0.4908lnm,b=0.4908lnm,c=l.1066nm,α=90°,β=90°,γ=l20°.结构中的镓和磷均与氧形成四面体配位,骨架中的氧为二桥氧.无Ga-P连接方式,质子化的乙二胺阳离子未在孔道中.     

In(CH3COCHCOCH3)3晶体合成及结构表征

标题化合物In(CH3COCHCOCH3)3晶体属单斜晶系,空间群P2(1)/n,晶胞参数:a=8.2042(16),b=13.281(3),c=16.380(3)A°,α=90°,β=90.91(3)°,γ=90°,Dc=1.534g/cm3,Mr=412.14,V=1784.6(6)A°3,Z=4,μ(M0Kα)=0.71073A°,F(000)=832,T=293(2)K,R=0.0412,Rw=0.1302.分子几何构形扭曲八面体.     

(C_(12)H_8N_2)_2MnCl_2晶体的水热合成与表征

用水热方法合成 (C12 H8N2 ) 2 Mn Cl2 晶体 ,并用 X射线衍射仪对其结构进行表征 .该晶体属单斜晶系 ,P2 1/c空间群 ,a=0 .9472 (2 ) nm,b=1 .52 0 36(1 1 ) nm,c=1 .452 7(2 ) nm,α=γ=90°,β=98.96(2 )°,V=2 .0 664(6) nm3,Z=7.     

三维超分子化合物[Na2(H2bta)·2H2O]的水热合成与晶体结构

用水热合成的方法制备Na2(H2bat)·2H2O,X-射线单晶结构分析确定晶体属于三斜晶系,P-1空间群,晶胞参数a=5.4684(11)A °,b=6.7862(14)A °,c=8.7140(17)A °,α=79.81(3)°,β=75.68(3)°,γ=68.92(3)°,V=290.97A °3,Z=2,De=1.907 g/cm3,R1=0.0386,ωR1=0.149,S=1.083.     

三维超分子化合物〔Na_2(H_2bta)·2H_2O〕的水热合成与晶体结构

用水热合成的方法制备Na2(H2bat)·2H2O,X-射线单晶结构分析确定晶体属于三斜晶系,P-1空间群,晶胞参数:a=5.4684(11)A°,b=6.7862(14)A°,c=8.7140(17)A°,α=79.81(3)°,β=75.68(3)°,γ=68.92(3)°,V=290.97A°3,Z=2,De=1.907g/cm3,R1=0.0386,ωR1=0.149,S=1.083.     

H3O[Zn（Phen）3]2[PMo2^（Ⅴ）Mo10^（Ⅳ）O40]的合成与晶体结构

利用中温水热技术合成了Keggin型结构钼磷多金属氧酸盐H3O[Zn(phen)3]2[PMo(Ⅴ)2Mo(Ⅵ)10O40],并测定了其晶体结构.该化合物属于单斜晶系;C2/c空间群,晶胞参数a=1.980 2(4) nm,b=1.813 4(4) nm,c=2.508 5(5) nm,α=90.00°,β=100.44(3)0°,γ=90.00°,V=8.860(3) nm3,Z=4,R1=0.044 2,wR2=0.140 3.     

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.     

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.     

A computer generator for randomly layered structures

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

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.     

海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化

本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。     

Exciton Seebeck in Molecular Systems

Various applications relevant to the exciton dynamics,such as the organic solar cell,the large-area organic light-emitting diodes and the thermoelectricity,are operating under temperature gradient.The potential abnormal behavior of the exicton dynamics driven by the temperature difference may affect the efficiency and performance of the corresponding devices.In the above situations,the exciton dynamics under temperature difference is mixed with     

Achieving Unusual States of Matter Under High Pressure

The elongation method,originally proposed by Imamura was further developed for many years in our group.As a method towards O(N)with high efficiency and high accuracy for any dimensional systems.This treatment designed for one-dimensional(ID)polymers is now available for three-dimensional(3D)systems,but geometry optimization is now possible only for 1D-systems.As an approach toward post-Hartree-Fock,it was also extended to