生态农业—实现农业持续发展的必然选择

通过对农业发展历程回顾,阐明了生态农业是实现农业可持续发展的唯一道路。同时说明了生态农业的概念及其特征,总结了近20年来中国生态农业发展的历史,指出发展生态农业是中国实现农业现代化的必然选择。     

浅谈阿坝州发展生态农业的建议

目前生态农业在全国如火如荼地发展,我州也正积极推进生态农业发展,制定了生态农业发展规划。但据了解,现在许多地方政府及种植业公司打着生态农业的晃子,不按照世界生态农业发展模式及我国生态农业发展思路和要求进行农产品生产加工,以农产品商品价格最大化为目的,以赢利为目的而进行的生态农业发展。为避免我州生态农业走入歧路,少走弯路,确保生产出真正的生态有机农产品、健康食品,保护自然生态环境,笔者根据自己了解和掌握的一些国内外发展模式,在生态农业发展中提出一些想法和建议,供同行专家及政府领导探考。     

汶川县生态农业发展对策

本文分析了汶川县生态农业发展现状、优势、制约汶川县生态农业发展的因素,就汶川发展生态农业的模式及发展生态农业的关键技术提出了粗浅建议。     

依托科技专家大院 发展生态农业

＂安徽省生态农业科技专家大院＂是来安县威光绿园生态农业专业合作社小李庄承担的省级农业科技专家大院项目。该项目2008年被批准立项,经过建设与发展,在促进生态农业生产和科技进步,以科技推动企业生产和农户增收上,取得了显著的效果。     

山东临沂市河滩地生态农业模式设计

生态农业是未来农业发展的根本方向 .本文对生态农业做了概述 ,同时对临沂市河滩的治理提出了一个生态农业模式 .本模式以农业生态学及生态经济学原理为指导 ,发展多种经营 ,综合利用 ,不仅能有效地治理河滩 ,而且还能获得极好的经济效益和社会效益 ,改善和保护农村的生态环境     

茂县生态农业发展存在问题及对策

摘要生态农业是生态工程在农业上的应用,是在经济和环境协调发展的原则下,总结各种农业生产方式的成功经验,以生态学、经济学理论为依据,运用现代科技成果和现代管理手段,在特定区域内所形成的经济效益、社会效益和生态效益相统一的农业。笔者结合茂县生态农业发展的现状,分析了茂县生态农业发展中存在的问题,提出了对策,并对生态农业的发展进行了展望。     

中国农业发展的方向—生态农业

生态农业是遵循生态经济学规律进行经营和管理的集约化农业体系，生态农业是我国农业发展的主要方向。本文分析了我国农业发展的现状和趋势，阐述了生态农业的概念及研究现状，探讨了发展生态农业的现实意义和深远的历史意义，提出了发展生态农业的对策与措施，生态农业的建设和发展是我国农业发展的趋势，发展生态农业符合我国的基本国情，有利于贯彻农业生产因地制宜的原则，有利于农业自然资源开发利用与保护，有利于开发农村人力资源，有利于提高农业生产的综合效益，有利于农业发展的战略转移。     

运城市发展生态农业的前景及对策

介绍了生态农业的定义,分析了运城地区发展生态农业的前景,就运城市发展生态农业提出了一些建议。     

甘肃省生态农业产业化模式研究

西部大开发给甘肃农业带来了难得的发展机遇.在分析了甘肃生态农业产业化的条件后,得出了甘肃只有大力发展生态农业,走农业产业化的道路才是农业发展的唯一出路的结论.提出了甘肃发展生态农业的指导思想、原则,并根据甘肃地理环境的地域分异规律和农业发展的传统,设计了6种生态农业产业化的模式,并提出了甘肃发展生态农业的对策,包括政府主导、政策扶持、产业结构调整和依靠科学技术等.     

生态农业模式及可持续发展对策研究

随着我国经济社会的发展和经济体制改革的推进,发展生态农业日益成为现代农业实现高效和可持续发展的要求。本文将结合对现有主要生态农业模式的分析,在着眼长远的基础上提出发展生态农业的对策和建议,以期提高生产率和经济效益。     

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     

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     

Journal of Donghua University ( English Edition) Contents of Volume 31

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