时滞中立型线性随机大系统的渐近稳定性

讨论了时滞中立型线性随机系统平凡解的几乎渐近稳定性，并推广到时滞中立型线性随机大系统的几乎渐近稳定性，首次给出了中立型随机大系统渐近稳定性的代数判据，并用实例加以验证．     

线性It(ò)随机系统部分变元的强稳定性

运用随机线性系统的柯西矩阵及其截断矩阵,通过引进随机线性系统左截柯西矩阵和右截柯西矩阵,讨论了线性It(o)随机系统部分变元的几乎必然强稳定性,得出了该系统只依赖于左截柯西矩阵的有界性和右截柯西矩阵的渐近性的各种a.s强稳定性,包括强稳定、强一致稳定、强渐近稳定、强一致渐近稳定及强指数稳定之间的等价条件,推广了已有文献的结果.     

线性I随机系统部分变元的强稳定性

运用随机线性系统的柯西矩阵及其截断矩阵 ,通过引进随机线性系统左截柯西矩阵和右截柯西矩阵 ,讨论了线性It^o随机系统部分变元的几乎必然强稳定性 ,得出了该系统只依赖于左截柯西矩阵的有界性和右截柯西矩阵的渐近性的各种a .s强稳定性 ,包括强稳定、强一致稳定、强渐近稳定、强一致渐近稳定及强指数稳定之间的等价条件 ,推广了已有文献的结果     

关于随机微分系统的M_0—稳定性

本文的目的是将确定性常微系统的M_0—稳定性概念与结果,推广到一般随机微分系统.然后,利用这些结果来研究随机受扰确定性系统M_0—稳定性的条件;借助未受扰确定性系统的Lynpunov一型函数及比较方法,得到了随机受扰系统M_0—几乎必然一致渐近稳定性与M_0—p阶矩一致渐近稳定性的充分条件.     

广义离散线性随机系统的稳态Kalman估计

用现代时间序列分析方法,基于ＡＲＭＡ新息模型和白噪声估值器,提出了广义离散随机线性系统的一种稳态Ｋａｌｍａｎ估值器,可统一处理滤波,平滑和预报问题可处理带相关噪声系统,并给出了保证其渐近稳定性的初值选取公式。     

中立型非线性随机系统的渐近稳定性

研究了一类具有可变时滞的中立型非线性随机系统解的渐近性质，利用李亚普诺夫函数和半鞅收敛定理，得到了该系统解的三个渐近性质不等式；通过伊藤公式与半鞅收敛定理及不等式技巧建立了确定这种系统解的极限位置的充分条件，并且从这些条件得到了中立型非线性时滞随机系统解的渐近稳定性、多项式渐近稳定性及指数稳定性有效判据，其结果涵盖并推广了毛学荣关于中立型非线性随机系统解的渐近性质方面的部分结论．     

NA序列部分和随机乘积的渐近分布

利用NA序列部分和最大值的矩不等式及部分和乘积的渐近分布, 得出NA序列部分和随机乘积的渐近分布, 并将已有部分和乘积的结果推广到部分和随机乘积上, 进而得到一类统计量随机乘积的渐近分布.     

一类不确定混合线性系统鲁棒自适应控制

通过分析一类具有Markov跳跃参数的不确定混合线性系统的随机稳定性问题,将确定型系统中的Lasalle稳定性定理推广到混合系统中,并对系统不确定部分的未知范数上界提出了一种参数自适应估计方法及相应的鲁棒控制律,实现了混合线性系统以概率1渐近稳定.研究结果表明,此控制方案对混合线性系统的不确定部分有较强的鲁棒性.     

有限族广义渐近拟伪压缩型非自映象的迭代逼近

在实赋范线性空间中引入并研究一类新的有限族几乎一致Lipschitz广义渐近拟伪压缩型非自映象,使用新的分析方法,在较弱条件下建立了这类有限族几乎一致Lipschitz广义渐近拟伪压缩型非自映象不动点具混合型误差的Reich-Takahashi型迭代序列的强收敛定理,所得结论改进和推广了有关文献中的相应结果.     

线性It^↑O随机系统部分变元的强稳定性

运用随机线性系统的柯西矩阵及其截断矩阵，通过引进随机线性系统左截柯西矩阵和右截柯西矩阵。讨论了线性It^↑O随机系统部分变元的几乎必然强稳定性，得出了该系统只依赖于左截柯西矩阵的有界性和右截柯西矩阵的渐近性的各种a．s强稳定性，包括强稳定、强一致稳定、强渐近稳定、强一致渐近稳定及强指数稳定之间的等价条件，推广了已有文献的结果．     

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