关于分块矩阵的g—逆的反问题

考虑如下的问题:给定Ａ∈Ｃｍ×ｎ,Ｂ∈Ｃｍ×ｐ,Ｃ∈Ｃｎ×ｍ,求Ｘ∈Ｃｐ×ｍ,使得(Ａ,Ｂ)-=ＣＸ.(1)　　文[1]中给出了分块矩阵(Ａ,Ｂ)的ｇ＿逆公式,很有意义的一个问题就是:如果(Ａ,Ｂ)的ｇ＿逆中有一块是指定的,那么另一块是否存在?本文对此问题给出了较全面的解答.引理1[1]　设Ａ∈Ｃｍ×ｎ,Ｂ∈Ｃｍ×ｐ,则(Ａ,Ｂ)-=Ａ--Ａ-Ｂ(ＥＡＢ)-ＥＡ　　　(ＥＡＢ)-ＥＡ,其中ＥＡ=Ｉ-ＡＡ-.引理2[2]　矩阵方程ＡＸＢ=Ｄ可解的充要条件是ＡＡ-ＤＢ-Ｂ=Ｄ.(2)当(2)成立时,此方程的一般解为Ｘ=Ａ-ＤＢ-+Ｚ-Ａ-ＡＺＢＢ-,或等价地Ｘ=Ａ-ＤＢ-+ＦＡ…     

超立方体上的奇异值分解

本给出了在超立方体连接的单指令流多数据流（ＳＩＭＤ）机器上进行矩阵奇异值分解（ＳＶＤ）的算法，对ｍ×ｎ／２个处理单元的ＳＩＭＤ机器上进行ＳＶＤ，时间复杂度为Ｏ（ｌｏｇｍ．ｎ．ｌｏｇｎ）。本还给出了大型矩阵在固定大小的ＳＩＭＤ机器上求解ＳＶＤ的行压缩与列分割方法。     

关于正视规矩阵的谱变分

本文对正规矩阵Ａ，Ｂ的谱变分给出一些新的估计，证明了对于任何单调酉不变范数‖．‖，ｖ（Ａ，Ｂ）≤‖Ａ－Ｂ‖。设Ａ＝ＵΣ１Ｕ＾Ｈ和Ｂ＝ＶΣ２Ｖ＾Ｈ是谱分解，则Ｖ（Ａ，Ｂ）≤‖｜Ｕ＾Ｈ（Ａ－Ｂ）Ｖ｜‖。一个推论部分地改进了已知的结果。     

广义四元数代数上伴随λ—矩阵及应用

设ＨＦ（ａ，ｂ）是域Ｆ上广义四元数代数，本文定义了ＨＦ（ａ，ｂ）上ｎ阶λ－矩阵的伴随矩阵，作为伴随矩阵的应用，得到了义四元数方阵可逆的充要条件与逆矩阵计算公式，给出了ＨＦ９ａ，ｂ）上矩阵Σ（Ｋｉ＝０）Ａｉ×Ｂｉ＝Ｃ有唯一解的充分条件以及唯一解的显式解公式。     

拟正态分布均值矩阵的容许线性估计(Ⅰ

考虑了以下问题：设ｎ×ｍ随机矩阵Ｙ有分布Ｎ（Θｎ×ｍ,Ｖｍ×ｍΣｎ×ｎ）,即Ｙ服从均值向量为Θ协方差矩阵为Ｖｍ×ｍΣｎ×ｎ的多元正态分布,其中Θ为未知矩阵．讨论了当Ｖｍ×ｍΣｎ×ｎ已知时,均值矩阵Θ在３种比较标准下的容许线性估计．并称以上分布为拟正态分布．     

分块矩阵[ABCD]的奇异性

设Ｍ＝ＡＢＣＤ为复数域上的矩阵,其中Ａ为ｍ×ｎ矩阵,ｒａｎｋＡ＝ｒ≤ｍｉｎ（ｍ,ｎ）,Ｂ为ｍ×ｒ１矩阵,ｒａｎｋＢ＝ｒ１,Ｃ为ｒ２×ｎ矩阵,ｒａｎｋＣ＝ｒ２,ｍ＋ｒ２＝ｎ＋ｒ１．本文研究了矩阵Ｍ的奇异性,给出了Ｍ为非奇异矩阵的充分必要条件,也给出了Ｍ－１＝Ａ＋Ｃ＋Ｂ＋Ｄ＋的充分必要条件．     

Lanczos算法误差估计的若干问题

设Ａ为ｎＸｎ实对称矩阵，对于给定的ｊ个线性无关列向量组成的ｎ×ｊ实矩阵Ｑ，对任意ｊ×ｊ实矩阵Ｔ，记Ｒ（Ｔ）＝ＡＱ－ＱＴ。本文给出ｊ×ｊ实矩陈Ｈ，使｜｜Ｒ（Ｈ），并证明当Ｔ取矩阵Ｈ时，文献［１］中Ｐ．１２２定理４．１０的“”可以改变成“１”。     

环上矩阵的Moore－Penrose逆

环上矩阵的Ｍｏｏｒｅ－Ｐｅｎｒｏｓｅ逆周建华（东南大学数学力学系．南京２１００１８）本文中的环Ｒ均指含单位元的结合环，Ｒ￣（ｍ×ｎ）表示Ｒ上地（ｍ×ｎ）矩阵全体。若σ是Ｒ上的对合反自同构，Ａ∈Ｒ￣（ｍ×ｎ），Ａ＝（ａ＿（ｉｊ）），则以Ａ＊表示（ａ＿（...     

自回归模型的极限定理

考虑如下自回归模型 :ｙｔ=ＺｔＣｏ ｃ1 ｙｔ- 1 ｃ2 ｙｔ- 2 … ｃＨｙｔ-Ｈ εｔ. (1 )这里Ｃ0 为ｋ× 1常向量 ,Ｚｔ 为 1×ｋ非随机向量 ,Ｚｔ=(ｚｔ1 ,ｚｔ2 ,… ,ｚｔｋ) ,ｃｈ(ｈ =1 ,2 ,… ,Ｈ)为常数 ,εｔ 为扰动项[1 ,2 ] 令ｘｔ=(Ｚｔ,ｙｔ- 1 ,ｙｔ- 2 ,… ,ｙｔ-Ｈ) ,β′=(Ｃ′0 ,ｃ1 ,ｃ2 ,… ,ｃＨ) ,则式 (1 )化为ｙｔ=ｘｔβ εｔ. (2 )令Ｙ =(ｙ1 ,ｙ2 ,… ,ｙＴ)′,Ｘ =(ｘ′1 ,ｘ′2 ,… ,ｘ′Ｔ)′,ε=(ε1 ,ε2 ,… ,εＴ)′,则式 (2 )化为Ｙ =Ｘβ ε. (3)定理 1　假设式 (3)满足(Ａ)　εｔｉ.ｉ.ｄ且四阶矩…     

二阶矩阵线性微分方程的振动性定理

考虑二阶线性微分系统Ｙ″ Ｑ(ｔ)Ｙ=0,ｔ∈[ｔ0,∞).　　　　　(1)其中Ｑ(ｔ),Ｙ(ｔ)为ｎ×ｎ实连续矩阵函数,且Ｑ(ｔ)是对称的.系统(1)的解Ｙ(ｔ)称为非平凡解,如果至少存在一个ｔ∈[ｔ0,∞)使ｄｅｔＹ(ｔ)≠0;系统(1)的平凡解称为预备解,若Ｙ(ｔ)Ｙ′(ｔ)-(Ｙ(ｔ))′Ｙ(ｔ)≡0,ｔ∈[ｔ0,∞).(其中对任意矩阵Ａ,Ａ表示Ａ的转置).系统(1)称为振动的,若对任何Ｔ>ｔ0,系统(1)的每一个非平凡预备解Ｙ(ｔ)的行列式在[Ｔ,∞)上有零点,否则称(1)为非振动的.对任何矩阵Ａ,用λ1[Ａ]表示Ａ的最大特征根,用ｔｒＡ表示Ａ的迹.本文建立了两个振动新定…     

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