兰州市生态环境及其调控研究

对兰州市生态环境问题及其形成发展原因进行了综合分析研究，探讨了调控方针策略，进而提出了调整产业结构与布局，全面治理污染，调整大农业结构，发展优质高效的城郊集约型农业。     

砀山农业资源与生态农业建设探讨

分析了安徽砀山农业资源的优势及不利因素，认为改善当地生态环境是农业发展的前题．当地生态环境的改善经历了防风固沙──治理盐碱──调整农业结构三个阶段．本文就农业资源合理利用和生态农业建设提出了若干对策。     

经济体制对河西走廊生态的影响

农业是改革开放20年河西致富的经济增长点，但农业的发展是以损害生态环境为代价的。而调整河西产业结构又面临诸多障碍。优化河西生态环境，要发展城市化与工业化。采取措施，消除河西生态环境建设中市场失灵造成的负效应。改革管理体制，消除河西生态环境恢复机制发挥作用的障碍。     

浅谈我市草产业的发展

草产业是实现社会、经济、和生态环境协调发展的朝阳产业，是现代化农业的重要组成部分、是调整产业结构增加农民收入的重要途径，是改变生态环境、实现农业可持续发展的支柱产业。现就我市草产业的发展谈几点意见。     

安徽砀山县农业资源与生态农业建设探讨

文章分析了安徽砀山县农业资源的优势及不利因素,认为改善当地生态环境是农业发展前题。当地生态环境的改善经历了防风固沙－治理盐碱－调整农业结构三个阶段。文章就农业资源合理利用和生态农业建设提出了若干对策。     

山东省农业结构及发展水平综合评价研究

山东省农业在经历了近20年的持续高速增长后，经济总量已达到相当大的规模，获得这一规模，投人了巨额建设资金，消耗了大量自然资源，付出了沉重的生态环境代价．本文分析了山东省农业结构的变化，在建立指标体系的基础上对农业结构及发展水平进行综合评价，提出农业结构优化调整的建议．     

摆脱我国农业发展困境的思考

我国农业取得了巨大的成就,同时也在诸多方面存在着问题。要发展现代农业,摆脱农业发展的困境,就必须高度重视农业的发展,及时调整战略,从农业产业结构、农业生态环境、高等农业教育等多方面加快农业改革和发展的步伐,使农业步入现代化发展的轨道。     

从黑龙港地区干旱缺水论实行旱作农业和节水型农业途径

本文针对黑龙港地区干旱缺水与隐患深重的农业生态环境,提出了实行旱作农业和节水型农业途径。发展旱作农业主要措施是培肥地力、蓄水保墒、调整作物布局。发展节水型农业的主要措施是试验推广节水型灌溉制度和先进的灌水方法。     

南充市顺庆区国家生态示范区循环农业建设模式探讨

循环农业是一种全新的理念和策略,它运用可持续发展思想、循环经济理论调整和优化农业生产结构,减轻环境污染和生态破坏,实现农业经济和生态环境效益的统一．本文从南充市顺庆区发展循环农业的必要性人手,结合区域农业发展现状,因地制宜地提出了顺庆区循环农业发展的四种模式以及政策措施．     

甘谷县梯田建设成效及成功经验浅析

梯田建设作为改善区域农业生产基本条件,加强产业结构调整,发展旱作农业和特色产业的基础性工程,对促进区域生态环境建设具有重要意义。通过对甘谷县梯田建设现状分析,阐述了甘谷县梯田建设治理模式、取得的建设成效和相关成功经验,从而为指导同类地区梯田建设和生态环境综合治理提供可借鉴依据。     

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