积分因子与极限环

给出了一类多项式型积分因子的求法 ,讨论了全微分或具有积分因子的平面自治系统在相平面的极限环的不存在性 ,闭轨的存在性与不唯一性。     

关于波函数的相因子

由于Aharonov—Bohm效应,规范交换与不可积相因子引起人们越来越多的关注.然而,现行的量子力学教材却很少涉及这个问题.为此,本文拟就相因子的定义、函数相因子与规范变换的关系及不可积相因子等问题进行一些讨论,不当之处希望得到指正.     

Berry相因子与主纤维丛的关系及其拓扑性质

用纤维丛理论描述Ｂｅｒｒｙ相因子。将Ｂｅｒｒｙ相位作为联络１－形式及相应参数空间的曲率２－形式。利用Ａｔｉｙａｈ－Ｓｉｎｇｅｒ指数定理。讨论了Ｂｅｒｒｙ相因子的拓扑性质及其与反常之间的关系。     

对单色光照明成象公式的再探讨

指出文［１］中关于单色光照明成象公式推导的不妥之处，在考虑二次位相因子的情况下重新推导该公式。最后对结果做了讨论     

也谈单色光照明成象公式

指出文[1]中关于单色光照明成象公式推导的不妥之处,在考虑二次位相因子的情况下重新推导该公式。最后对结果做了讨论。     

文献保障率的微观观照

本文在对“需求满足”的含义给予新的阐述的基础上，详细讨论并重新确定了“文献保障率”的决定性影响因子和附加影响因子。对读者需求类别的确定和对与此相对应的出版物的收藏的完备程度是文献保障率的决定性影响因子，藏书总量和读者人数只是附加影响因子，而传统的表述和公式在理论和技术上都存在缺陷。     

Berry相因子与Lewis相因子关系的证明

对一类含时哈密顿量在渐近情况下存在一种特殊形式的不变量,与这种不变量相关联的Lewis相因子在渐近极限下便成为Berry相因子,从而揭示了Lewis相因子与Berry相因子的联系。     

金沙江(渡口段)水环境质量评价方法

本文着重讨论了水环境质量评价中的质量控制,利用主成份分析,模糊聚类分析进行主次污染因子的确定,选择评价参数,校核环境质量分级均取得较好的效果。悬浮相颗粒态金属参与水质评价时,探讨了悬浮相金属的评价标,应用于金沙江(渡口段)得到满意的结果。     

介观环的持续电流与Berry相因子

本文研究处于铁磁自旋波的非均匀磁场中介观环的持续电流及几何位相，求出了准粒子的激发谱及电荷流，讨论了相关的Ｂｅｒｒｙ相因子。     

电场中q-形变谐振子广义奇偶相干态的叠加态的压缩效应

构造了电场中q-形变谐振子广义奇偶相干态的叠加态,并研究了其基本特性,进一步讨论了叠加态的压缩效应,揭示了电场强度、形变参数及相因子对其产生的影响.     

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.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

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