我国实施农业保护的必要性及战略对策

我国自古以农立国，十二多亿人口，九亿在农村，是我国的基本国情。我国农业基础薄弱，在经济转型期，农业面临自然风险和市场风险，在市场竞争中处于明显的不利地位。鉴于农业的基础地位和我国的基本国情，必须采取相应的对策，对农业实施支持和保护。     

浅析入侵物种风险与法律控制

随着经济全球化和自由贸易进程的加快,我国面对的外来有害生物的危害越来越大,作为农业大国和贸易大国的中国如何应对这一危害的挑战越来越受世人的关注。本文通过对入侵物种的特点分析从而对其风险进行一定的分析,并根据我国的基本国情提出相应的法律对策。     

浅谈新时期农田水利建设机制

我国是一个农业大国，人多地少，水资源短缺、降雨时空分布不均、水旱灾害频繁，这些基本国情决定了农田水利建设在农业生产和经济社会发展中具有特别重要的作用。本文将对新时期农田水利建设机制做些探讨。     

我国无土栽培的概况及发展前景

无土栽培是一种新型的农业栽培技术,本文就无土栽培的方式及优缺点、栽培要点等方面做了综述,并进一步从从我国基本国情出发论述了我国无土栽培的发展趋势和发展前景。     

我国无土栽培的概况及发展前景

无土栽培是一种新型的农业栽培技术,本文就无土栽培的方式及优缺点、栽培要点等方面做了综述,并进一步从从我国基本国情出发论述了我国无土栽培的发展趋势和发展前景。     

提高农民素质是我国农业现代化建设的紧迫任务

提高农民素质是我国农业现代化建设的紧迫任务王秀梅，王俊卿我国是世界人口最多的典型的农业大国，农村人口占全世界农村人口的四分之一之多，占我国总人口的８０％以上。这一基本国情决定了农民问题始终是我国革命和建设的基本问题。农民素质如何，直接影响着我国农业现...     

我国农业风险的变化趋势及风险管理体系的构建

在对农业风险分类相关文献回顾的基础上,按照成本收益的定义构建了新的农业风险分类,将农业风险分为产量风险、价格风险和成本风险。在此基础上,运用5年移动平均法计算各类风险的变异系数,对改革开放以来我国农业风险的纵向和横向变化进行了对比。从纵向来看,3种农业风险均呈现越来越严重的趋势;从横向来看,我国农业生产主要是价格风险,其次是成本风险,最后才是产量风险。依据农业风险管理主体的分类,建议从微观、中观和宏观方面构建农业风险管理体系。     

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。     

我国目前农业保险现状简析

我国农业在国民经济中居于基础性地位,但相对于农业在国民经济中的地位和规模,我国农业保险的发展却严重滞后。我们拟从作为农业保险当事人的投保人和保险人方面,以及政府支持法规建设等方面作一些探讨。     

农村水利灌溉工程施工技术及应用

基于我国的基本国情来考虑,我国属于农业大国,农业的发展对国民经济有着极为重要的作用和意义。为了在确保广大农民的生产生活质量提升的同时构建社会主义和谐社会,我国要大力发展农业产业,促进农业经济的高效快速发展。随着技术革命的不断更新和换代,我国农业现代化水平也逐步提升,其中,农村水利灌溉工程的相关施工技术及其应用也取得了快速高效的发展和进步。该文主要基于农村经济发展现状,介绍和研究了现代农村水利灌溉工程施工技术,并通过水闸、小型排灌站、农桥等工程实现农村水利灌溉工程施工技术的广泛应用,旨在提升我国农村水利灌溉施工技术的质量和水平。     

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