M3（R）中的极大R—子代数

李立斌等人证明了随机矩阵全体构成M3(R)的一个极大R—子代数，因此研究M3(R)中的极大R—子代数就变得非常重要了。在此背景下，构造出M3(R)中的所有极大R—子代数。     

M3(R)中的极大R-子代数

李立斌等人证明了随机矩阵全体构成M3(R)的一个极大R-子代数,因此研究Mn(R)中的极大R-子代数就变得非常重要了.在此背景下,构造出M3(R)中的所有极大R-子代数.     

交换环上辛李代数的一类子代数的导子

设m是一个正整数,R是一个带有单位元的交换环,2在R中可逆,N是辛李代数sp(m,R)的标准极大幂零子代数.确定了李代数N的导子.     

可换环上严格上三角矩阵代数的若当导子

令R是含有单位元1且2为其可逆元的可换环,M(n,R)表示R上所有n×n阶矩阵形成的代数,N(n,R)表示R上所有严格上三角矩阵所形成的M(n,R)的子代数.本文具体刻画了N(n,R)上的任一若当导子,即N(n,R)的每一个若当导子均可被唯一地分解为内导子、对角导子和中心导子之和.     

局部环上特殊正交群的一类极大子群

设R是局部环,M是唯一的极大理想,R表其剩余类域,且charR≠ 2,SO(2m,R)表示R上的特殊正交群,G(2m,M) =ABCD∈SO(2m,R) |B∈Mm×m ,本文在m≥ 3的情形下,证明了G(2m,M)是SO(2m,R)的一个极大子群.     

理想化的互极大图

设R是有1的交换环,M是R-模,R(+)M是环R对于R-模M的理想化.讨论了理想化R(+)M的理想、极大理想和可逆元与环R的理想、极大理想和可逆元之间的联系,并利用理想化的代数性质,讨论了R(+)M的互极大图的子图Γ2(R(+)M)-J(R(+)M)的直径和围长.     

A型扩张仿射李代数的极大子代数

设S是欧式空间R~n上的最小半格,由Jordan代数J(S)通过TKK构造可得到一个称之为TKK代数的李代数T(J(S)).进一步,可由TKK李代数T(J(S))得到一个A_1型、零度为v,且带有扩张仿射根系R(A_1,S)的扩张仿射李代数T.研究了扩张仿射李代数T的极大子代数,并得到了它的四类极大子代数.     

局部环上辛群中一类子群的扩群

定出了局部环上辛群中一类子群的扩群,得到了如下结果:设R是局部环,M是R的唯一极大理想,Sp(2m,R)为R上辛群。对R的任意理想S,G(S)表示子群{ABCD∈Sp(2m,R)|B∈Sm×m},如果G(0)≤X≤G(M),m≥2,char(R/M)≠2,那么存在R的理想S,使得X=G(S)。     

D_4型李代数的极大幂零子代数的自同构

假设R是特征非2的交换幺环,L是R环上的D4型典型李代数,N是李代数L的一个极大幂零子代数.如果是极大幂零子代数N的任意一个自同构,那么可以表示成=ωη hσvvgμf,其中ω,η h,σv,vg,μf分别是图自同构、对角自同构、内自同构、第二中心自同构、中心自同构.     

关于有理想化子条件的环

本文是[1]的繼續。所謂具理想化子条件的环(代数)R是指R的任意子环(子代数)B的理想化子N(B)(即R中含B且以B为理想的最大子环(子代数))較B真正大。另一方面,称环(代数)     

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