非紧区域上算子值再生核的Mercer定理

多任务学习已经成为机器学习领域一个热门的课题.算子值再生核理论是多任务学习的重要数学基础.本文的主要工作是建立了非紧区域上算子值再生核的Mercer定理,从而将传统的紧区域上的再生核Hilbert空间理论推广到非紧区域上.     

Banach空间中不等价算子非紧性测度

用新的观点研究Banach空间中的算子非紧性测度.Banach空间X上的非空有界闭凸集构成的集族C(X)在通常的集合加法和数乘运算下可赋予范数构成赋范半群;接着利用序等距映射、格理想和抽象M空间等理论,在Banach空间上给出一个齐次算子非紧性测度的构造定理,并利用此定理证明了具有无限分解的Banach空间,特别地,具有无条件基的Banach空间上都存在着与Hausdorff非紧性测度不等价的齐次算子非紧性测度.     

论测度的正则性

关于测度的正则性,本文证明如下的一个定理。 设X是拓扑空间, μ是X上定义的Borel测度,满足:开集都是F_σ的; (ii)开集都是σ紧的;(iii)X=UX_n,每个X_n是开集,μ(X_n) <+∞;(iv)紧集都是μ可测的。那么,μ是正则的。 文章举例说明这是Rudin书中一个著名的定理的推广。     

具有再生核Hilbert空间中紧的偏微分算子

用再生核函数来刻画再生核空间中算子的性质,是研究再生核空间性质的一个重要方法.在本文中,研究了具有再生核的多元整函数Hilbert空间的基本性质,着重讨论了偏微分算子在该空间上的紧性,给出了一个用再生核函数刻画的偏微分算子是紧算子的充分必要条件,从而在具有再生核的多元整函数Hilbert空间上推广了已有的结果.     

局部凸空间非线性脉冲Volterra型积分方程解的存在性

利用局部凸空间中非紧性测度的基本性质,推广了一个不动点定理,然后应用此定理研究了局部凸空间中一类非线性脉冲Volterra型积分方程解的存在性,推广了已有文献的结果.     

一类正则概率测度方程解的不变集

随机过程的相空间为可分的距离空间,具有初始分布(?)的随机过程在时刻 t 的概率分布为 m(t,φ,·)它确定了一类概率测度方程,[2]对其进行了讨论,证明了解测度族的不变集定理。本文在[2]的基础上,把随机过程的相空间推广到满足某种条件的吉洪诺夫空间,并证明具有半群性的 m(t,φ,·)确定的测度方程的解测度族的不变集定理。设(X,T)是吉洪诺夫空间(完全正则的 T_1空间)。本文没有特别说明,X 总是指吉洪诺夫空间,而βX 是指 X 的 Stone-Cěch 紧化。设 X 是βX 的 Berel 集,B=σ(T)是由开集     

Минлос定理的推广

关于核空间上广义随机过程的Минлос定理是无限维空间测度和积分的基本定理之一,它可以看作关于特征函数的Bochner定理在核空间的推广。本文利用[1]中建立的对偶测度理论得到了比Минлос定理更广泛的结果,并将此推广到连通交换核李群情形,成为无限维空间中Bochner定理最广泛的形式之一。     

关于超空间的紧性

本文证明了拓扑空间X与超空间(B_F(X),T_V)(或(B_K(X),T_V)之间的如下紧性关系: 定理1 设B_F(X)为包含F_0(X)的任何非空集组成的集类,则(B_F(X),T_V)为紧空间的充要条件是(X,T)为紧空间。定理2 设B_K(X)为包含K_0(X)的任何非空集组成的集类,则(B_K(X),T_V)为紧空间的充要条件是(X,T)为紧空间。定理1、2 分别推广了[1],[4]中相应的结果。作为直接推论有定理3(P_0(X),T_V)为紧空间的充要条件是(X,T)为紧空间。此外,还对局部紧性得到下列定理4 设B_0(X)为包含K_0(X)的非空集组成的集类,其中每一个集A∈B_0(X),都能包含X在的某个紧集中,若(X,T)为T_2局部紧空间,则(B_0(X),T_V)为T_0局部紧空间。     

非紧性测度和不动点定理及其应用(英)

在Ｂａｎａｃｈ空间中研究微分方程的解的存在性问题时，经常用到Ｋｕｒａｔｏｗｓｋｉ引进的非紧性测度α（·）．本文在ｋ阶导数连续的函数空间定义了一类新的集函数Ω（·），我们称其为Ω－非紧性测度．其性质与非紧性测度α（·）的非常相似．然后又给出了一个不动点定理．利用Ω－非紧性测度和不动点定理，我们给出了两个例子，证明了Ｂａｎａｃｈ空间微分方程的解的存在性定理．其方法较以往要简练得多．特别是例１的结果有了很大的改近．     

Banach空间中中立型双扰动发展方程解的存在性

利用Hausdorff非紧测度理论及Darbo—Sadovskii不动点定理,研究Banach空间中在相关发展系统失去紧性的情况下中立型双扰动发展方程适度解的存在性,推广和改进了一些已知结果．     

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.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

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.     

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