生态园建设与生物多样性保护探讨

生物多样性保护对维护生态平衡和人类社会经济可持续发展具有重要意义。针对现阶段生态园建设在生物多样性保护工作中存在的主要问题,探讨如何发挥生态园功能,保护和发展生态物多样性。促进环境、社会、人 类曲和谐发展,建设环境友好型社会。     

水土保持问题与中国的持续发展

水土流失问题涉及到大面积的自然破坏,是人类诸多灾害的根源,其整个过程都会对人类生存环境产生极为不利的负效应。而水和土是人类赖以生存的基本物质,是发展农业生产的资源要素。水土保持对于改善水土流失地区的农业生产条件,建设生态环境,减少水、旱、风沙等灾害,发展国民经济,具有重要意义。     

环境问题经济学分析

环境的不断恶化已成为制约社会经济可持续发展的重要因素,为了避免生态系统因人类活动而受到巨大破坏,必须采取措施适当限制工业社会活动,保持生态平衡。环境问题的研究和解决也就成为日益关注的问题。本文从经济学角度对环境问题进行了分析并提出几点建议。     

环境科学与环境的科学化

当前,全世界面临着严重的环境问题,它不仅直接影响到人们的生活,危害着人们的健康,而且威胁着人类的生存。人类被迫奋起保护环境,发展环境科学。从广度上来说,愈来愈多的人知道了环境保护、生态平衡与人类息息相关;从深度上说,促使一切科学包括自然科学、社会科学、生产科学都注重生态平衡问题,一切建设事业都要考虑生态平衡的问题。大力开展环境监测,努力净化和改善环境,科学地利用环境资源和能源……一句话,人们对环境的研究正在广泛深入发开展,环境科学出现了蓬勃发展的局面。     

论绿色食品工程与民族地区经济和社会持续发展

<正> 资源紧缺、环境恶化、人口膨胀是当今制约世界经济持续发展的主要原因。人类改造自然、开发资源能力已超过大自然保持生态平衡的承受力,这种危机的加剧,威胁着人类的生存。国际社会都在积极寻求缓解这种危机、保持经济持续快速发展的手段。在此形势下,我国民族地     

从我国经济发展存在问题谈人与自然协调发展

改革开放以来,我国的经济建设取得了很大成就,2003年我国国民生产总值突破10万亿大关,人民生活基本达到小康水平,我国国民经济每年保持7%的发展速度.然而与高速发展的经济相伴生的一系列问题的出现,却破坏了自然界存在的有机状态以及与自然协调发展的关系,使生态平衡和人类生存环境遭到破坏.     

山东农林蜘蛛初步名录

农业自然资源调查和农业区划工作,是发展我国农业生产的一项重要的基础工作,而植保资源其中包括害虫天敌资源是农业自然资源调查的重要组成部分。查清害虫天敌资源,是实行科学防治病虫害、促进农业增产的重要环节。当前,害虫防治仍面临两个重大而难以解决的问题,一是农药继续污染环境引起人们的严重不安;二是合理的生态平衡急待建立,因此,进一步认真贯彻“预防为主,综合防治”的植保方针,探索其他防治措施已成为刻不容缓的事。近年来,以蛛治虫的研     

试论孟子生态环保思想

孟子的生态环境保护思想是孟子思想中重要的一个方面。他的有关生态环境保护的思想与观念,对于社会主义现代化建设,保持人与自然的和谐发展,维护生态平衡和促进社会的可持续发展具有十分重要的意义。     

论农业生产与农业生态环境保护

二十世纪中叶以来，能源危机问题、环境污染和破坏问题，以及生态平衡问题，已成为人类生存和发展所面临的严重问题。农业是一个和资源环境密切相关的产业部门，如何完成江泽民十六大报告提出的“加强农业基础地位。推进农业和农村经济结构调整，保护和提高粮食综合生产能力，健全农产品质量安全体系。增强农业的市场竞争力”的任务?一是要正确处理人与自然的关系；二是要正确处理农业生产与那样资源的关系；三是要实施农业可持续发展发展战略，搞好计划生育。     

重庆市巴县丘陵山地合理利用非种植业用地的探讨

农业用地可以划分为种植业用地和非种植业用地两大类。如何充分合理地利用非种植业用地,是农业现代化建设中搞好农业区划、发展大农业的一个重要问题。 巴县的水热条件优越,非种植业用地的利用已有基础,在利用上已形成以森林、园艺林地为主的非种植业用地结构,而且在地域分异上也存在着较为明显的差异。这种差异既可以用传统方法加以划分,也可以用数量分析方法进行计算,找出其地域差异。 为了充分合理地利用巴县的非种植业用地,在调查基础上,对全县非种植业用地的合理利用作了一个初步设想:将部分不适宜种植粮食作物的土地调整成为非种植业用地,发展适宜的柑桔、茶叶、桑蚕等;将疏林地、部分荒地用于植树造林;并充分利用可养殖水面和部分稻田发展养鱼。这样既可以有利于保持农业生态平衡,又有利于使全县农村尽快富起来,加快农业现代化建设的步伐。     

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