西南岩溶山区石漠化成因及其农业生态恢复对策

岩溶地区石漠化日益严重,生态环境也遭到严重破坏．石漠化形成和影响的因素主要有地质、气候、水文、植被和人类活动五个方面．该文从这五个方面分析了石漠化的产生及危害,并针对此提出了其脆弱生态环境恢复的对策．     

西南岩溶山区石漠化成因及其生态恢复对策

岩溶地区石漠化日益严重，生态环境也遭到严重破坏．石漠化形成和影响的因素主要有地质，气候，水文，植被和人类活动五个方面．作者从这五个方面分析了石漠化的产生及危害，并对此提出了其脆弱生态环境恢复的对策．     

晚清玉林地区自然灾害研究

晚清玉林地区自然灾害种类多,发生频率高,分布地域广,密度大。自然灾害对农业生产、民众生存条件和生活、生态环境、社会秩序造成严重破坏和危害。如此频发而严重的自然灾害,与玉林地区所处的地理位置、气候环境、水文特征,与当时处于小冰期及长期以来不合理开发,自然环境恶化均有一定关系。面对自然灾害,地方政府和绅士采取建社仓、兴修水利、赈济等措施防灾减灾。     

有关固体废弃物的企业环保发展与相关发展战略分析

随着我国市场经济体制不断完善,工业发展水平得到快速提升,各种固体废弃物大量产生,使生态环境遭到严重破坏,严重威胁着人们的身体健康.如何在保证经济快速发展的同时做到对生态环境的保护,找到二者的平衡点,是当今各个国家都在关注的问题.该文就固体废弃物给环境带来的污染进行分析,对有关固体废弃物的企业环保发展的现状进行阐述,提出相关发展战略,以不断改善生态环境,降低固体废弃物给环境带来的污染程度,促进经济可持续发展.     

试论煤矿开采地下水环境影响评价研究

我国是世界产煤大国,煤炭资源的开采为整个国民经济持续稳定发展做出了重要贡献。随着煤炭开采强度和延伸速度的不断加大提高,矿区的生态环境遭到严重破坏,生态环境质量急剧下降,而作为生态环境质量中首当其冲的地下水环境更是遭到严重破坏。因此对采矿引起的地下水水环境问题的研究迫在眉睫。     

东北低山丘陵生态经济型防护林发展战略

东北低山丘陵地区是经济林的重要培育基地,防护林带是主要的可利用土地资源。虽然东北低山丘陵区土地资源及可供开发的生物资源较丰富,但由于地区降雨季节集中、过度的农垦、放牧、樵采、开矿等原因,原始生态环境遭到严重破坏,土地生产力及资源利用率低,经济增长缓慢,水土流失严重。本文以东北低山丘陵地区防护林研究入手,在地理和气候、防护林及经济林现状分析的基础上,提出了生态经济型防护林发展建议。     

非常科学课堂

老虎为什么要受保护 近百年来．地球上人口不断增加，森林面积日渐减少，老虎的生态环境遭到严重破坏，加上人们的不断捕杀，老虎的数量越来越少．所以各国都制定了相应的珍惜动物保护法规。在我国，老虎被列为一类保护动物，任何单位和个人不能加以随意猎杀。     

安徽省新安江流域水土流失防治措施分析

安徽省新安江流域,20世纪50～60年代,由于滥砍滥伐、毁林开荒,地表植被遭到严重破坏,水土流失日渐加剧,进入新世纪,域内各区县政府高度重视水土保持工作,通过在流域内逐步采取多项治理措施,使水土流失得到了一定程度的控制.     

绿化荒山营造良好的兰州新区周边生态环境

国家级兰州新区位于兰州北部的秦王川盆地,自然形成以西北向东南逐渐从高到低而东南开口的簸箕湾地形,常年气候干旱,风沙日数多,故兰州新区首要的任务是改变周边的生态环境,使之成为宜居、宜业、宜游的理想之地。     

浅谈道路翻浆

道路翻浆是寒冷地区所特有的一种冻害现象。对于东北地区的道路施工来说是必须加以重视,充分考虑气候条件,土质条件,水分等条件对道路施工的影响,采取相应措施防止翻浆病害的发生。     

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。     

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     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

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