多电子体系中电子斥力势能产生机制的讨论

为解决电子排斥势能的计算,基于电子的波动性和粒子性相互依赖的观点,依据状态寿命正比于状态出现频次的构想,给出了一种电子排斥势能的计算方法。在这种方法中,体系的真实状态(或平衡状态)被看作由所有可能状态叠加而成。把能量看成各种不同状态寿命的函数,给出了在已知的电子密度分布数据限制下通过调整状态寿命参数获得能量极值的方法。本文方法可为双电子排斥能计算提供新的启示。     

吸引和排斥是自然界一切运动的共同矛盾

1、认为自然界的主要运动形式有:机械运动、热运动、电磁运动、核运动、基本粒子运动、化学运动和生命运动.2、讨论了非生物界中吸引和排斥的物理本质.3、指出在生命运动中存在着生物化学吸引和排斥作用.4、提出把吸引和排斥看成是自然界一切运动的共同矛盾.     

BN纳米管载流子注入的库伦效应

以态密度为基础,通过计算系统增加一个电子时,产生的系统能量ΔE变化,以及把BN纳米管看成一个电容入载流子时的库伦效应,得到库伦排斥能,分析库伦排斥对电子输运的影响,研究BN纳米管注入电子的过程.     

对电流变体系相变的进一步讨论

从二个不同的侧面,进一步讨论了电流变体系的相变问题, 使人们更清楚地理解电流变体系相变的物理本质.以前的讨论只考虑了由于悬浮颗粒的极化所导致的吸引作用,而忽略了实际存在的排斥作用.考虑了排斥作用后,所求出的临界电场,除了与温度和介电常数有关外,还与颗粒之间的排斥作用有关,弥补了以前讨论中存在的不足.     

看得见的磁场

正磁对我们来说不算陌生,从玩具到生活用品,都可以见到磁石的身影。冰箱贴或黑板贴就是小磁铁,使用指南针就是靠地球这个大磁石。磁石能吸引铁,通常也叫"吸铁石";由于能吸引铁,而且大部分磁石也是以铁为主做成的,所以磁石也叫"磁铁"。磁为什么对铁情有独钟呢,这是由磁所具备的神秘性质决定的。两块磁铁会远距离相互吸引(或相互排斥),说明磁铁周围有磁场。磁场是从哪里来的呢?原来,电和磁是分不开的,磁场是电流产生的,只要有电流,或者说有电荷运动(或者     

有限系统中两组分颗粒凝并问题的异权值蒙特卡罗模拟

对于两组分颗粒系统,某组分A在整个颗粒群中的混合均匀程度是一个非常重要的物理量。采用异权值蒙特卡罗方法研究有限系统中凝并核与组分相关的两组分颗粒凝并混合程度问题。首先,验证了核函数齐次性指数λ对系统凝并混合的影响,并得到了有限系统中分散指数与λ的变化规律。其次,发现并总结了有限系统中考虑不同组分间吸引或排斥作用时颗粒凝并混合规律:临界时间之前系统在吸引排斥因素以及核函数的共同作用下发生颗粒凝并,且排斥作用的影响远远大于吸引作用的影响;临界时间之后系统在核函数的单独作用下进行颗粒凝并,排斥或吸引作用的影响可以忽略不计。最后,拟合得到了临界时间与吸引排斥指数α的幂函数关系,以及临界时间与齐次性指数λ的指数函数关系。研究结果对药物混合工业过程的设计具有一定的理论指导意义。     

铁基高温超导体超导配对对称性研究

通常情况下,两个带负电荷的电子之间由于库仑力会相互排斥.然而,在某些材料中,电子与某种激发如晶格振动的耦合能够克服库仑排斥从而表现出相互吸引并发生配对.配对电子能够在材料中没有任何阻力地运动,表现出零电阻的特性,我们称之为超导.当超导体接近磁体时,会产生涡旋电流排斥磁力线的进入,它们之间出现巨大的排斥力,甚至可以使其悬...     

核-电子组合系统中γ射线激光的折射率增强

对于有两个电子跃迁和两个核跃迁的双简并四能级系统——核-电组合系统，利用相干光学驱动电子跃迁产生的量子干涉，可以实现γ射线激光的无吸收折射率增强．     

关于热核反应装置中轻核的能谱和有关的问题

一、引言在热核反应装置的轻介质中,由于核反应和快中子的碰撞,不断有高能轻核产生.同时它们又由于库仑散射引起的能量损耗而不断慢化,除了在慢化过程中参予核反应的以外,其它的高能轻核最后均通过与电子和介质核的多次碰撞而很快达到与介质温度相应的热平衡.因此,可以假定,在某一过渡能量 E=E_c 以下,轻核的能谱由麦克斯韦谱给出;而在此能量以上的能谱,则决定于源的能谱分布和慢化过程.以下我们将首先在二中求出 E>E_c 时的能谱,然后在三中讨论缝合能 E_c 应如何选择,才能比较合理地反映能谱向麦克斯韦谱的过渡,同时引进特征时间θ,ε和τ,最后在四中比较两能区中引起的反应率.     

康普顿散射中的'反冲电子'

文章对康普顿散射后电子的状态进行讨论.依椐散射电子所获得的能量分析散射后电于所处的状态,并按相对论效应和非相对论效应分别得到散射电子的速度表达式.根据电子获得的能量,讨论了散射电子的可能状态有:当所获得的能量为零时,电子保持原状态;当cosθ＞1-Eifm0c2/(hv0-Eif)hv0时,电子保持原态并电离出获得的能...     

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.     

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。     

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.     

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     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with