对称视角下两类广义积分敛散性的比较研究

广义积分是定积分的推广,是积分学中非常重要的内容。广义积分的计算是以广义积分的收敛为基础的,而两类广义积分■的敛散性是一般广义积分敛散性判别的基础。文章主要研究广义积分■的敛散性的等价性,基于对称及数形结合思想得出:当■时,无穷限积分■和瑕积分■敛散性等价,即当■时,广义积分■和瑕积分■同时收敛;当■时,广义积分■和瑕积分■同时发散。     

介于T21/2与T3空间之间的拓扑空间

在“分离性公理T0,T12,T1,T112,T2,T212,T3,T312,T4具有关系T4■T312■T3■T212■T2■T112■T1■T12■T0,反之不成立”的基础上,从定义出发,利用归纳法及连续函数的等价性研究“T3■T234■T212”,并给出两个重要反例,证明了T234空间的一些性质,使分离性公理更加完善.     

电偶极子和磁偶极子的螺旋表示(摘要)

在电场■中,电偶极子■受到一个力矩■的作用,■这里■和均为矢量,而且因为■是电偶极于的偶极矩,因此实际上它是与■无关的方位可以变化的量;根据赝螺旋定理可知,■可以看作是■所对应的赝旋转量,■和■这一对矢量可以用一个赝螺旋来表示,称为电偶极赝螺旋,记为τ_(PE),     

呼和浩特、包头二市郊区番茄主要病害症状识别与防治

作者于1989年至1991年调查了呼和浩特、包头二市郊区保护地和露地的番茄病害,并对番茄猝倒病(Pythurm aph■idermatum)、立枯病(Rhicocto■sola■ phytopnthora spp.),早疫病(Alterneria-sol■i)、晚疫病(Phytophthora infest■s),实腐病(Phoma dastructiva)、叶霉病(Cl■losporium fu■ Cooke)、白粉病(Lereil■ t■、Brysiphe polygoni)、无性世代(Oidiopsis tauric■)、溃疡病(corynebocterium michiga-■ pv.■(Smith)Jenen.)、疮■病(■(Doidge)Dye.)、角斑病(P■)、脐腐病(生理性病害)、日灼病(生理性病害)、裂果病(生理性病害)等13种主要病害症状的准确识别和有效防治进行了研究.     

从睡虎地秦简看秦国刍■税制度的特点

秦国刍■税制度有4个特点:刍■税是一种实物税制度;刍■税采取定额税征收方式;刍■税以田亩数量为计税依据;刍■税具有严格的征收管理制度。     

灵机一动

■IX这个罗马数字代表9,如何加上一笔,使其变成偶数?□加S变SIX。■1,2,3所能组成的最大数是多少?□321。■什么东西倒立之后会增加一半?□6。■有辆载满货物的货车,一人在前面推,一人在后面拉,货车还可能前进吗?□可能。下坡时。■干什么睁一只眼闭一只眼比较好?□射击。■太平洋的中间是什么?□平。■什么时候太阳会从西边出来?□发誓的时候。■什么东西不能用放大镜放大?□角度。■8个数字“8”,如何等于1000?□8 8 8 88 888=1000。■哪儿的海不产鱼?□辞海。■一年才上一天班,又不怕被解雇,他是谁?□圣诞老人。■睡美人最怕的是什么?…     

关于复矩阵■的秩及其推广

设A为复矩阵，■为A的共轭矩阵，■为■的转置，m为任意正整数，R(A）为A的秩.证明了■     

一些特殊图的剖分图的Randi■能量

图的Randi■能量定义为图的Randi■矩阵所有特征值的绝对值之和,本文通过原图的Randi■矩阵和剖分图的Randi■矩阵之间的关系刻画了完全图、完全二部图、友谊图和荷兰风车图的剖分图的Randi■能量。     

关于■_0-sn-度量空间(英文)

先给出■0-sn-网的定义,并用实例说明此定义比■0-弱基更弱,并再讨论■0-sn-网的一些性质,得出■0-弱基、■0-sn-网、cs-网、cs*-网之间的一些等价关系.     

弱准连续与弱■连续函数的分解

在拓扑空间中引入了弱连续、弱准连续以及弱■连续和■连续的概念,着重讨论了弱准连续、弱■连续和弱连续的一些性质,并给出了关于弱■连续函数几种等价刻画以及■连续函数的一种新的分解。     

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