基于传统生态足迹和能值生态足迹方法的湖北省可持续发展状态比较

运用传统生态足迹方法及其改进方法-能值生态足迹方法,对2008年湖北省可持续发展状态进行比较分析.结果表明:传统生态足迹方法计算所得人均生态赤字为1.37 hm2,能值生态足迹方法计算得到人均生态赤字为3.96 hm2,两种方法均反映该区域可持续发展状态应引起人们重视,但能值生态足迹方法更能真实地反映研究区域生态经济系...     

基于生态足迹分析法的人口容量计算研究——以浙江省金华市为例

生态足迹作为一种对地区可持续发展的定量度量方法,在评判生态可持续发展、地区生态安全、经济发展与生态保护间的关系等方面得到了广泛应用。根据生态足迹分析方法通过对生态足迹、生态承载力和生态盈亏的分析,构建人口容量的计算模型,并将模型应用于金华市的人口容量分析中,以期为区域的社会、经济与生态可持续发展提供科学的依据与指导。     

基于修正的生态足迹区域可持续发展评价

针对传统的生态足迹模型在区域可持续发展评价中存在的不足,将其分为消费性生态足迹和生产性生态足迹,并以苏州为案例,计算分析了其1993年~2002年的可持续发展状况,测算了其历年的生态经济系统发展能力.结果表明:苏州十年的人均生产性生态赤字均小于全球人均生态赤字0.4 hm2,人均消费性生态赤字则均大于0.4 hm2,其生态环境是区域可持续、全球不可持续型,且生态效率逐年提高;生态经济系统发展能力逐年上升,增加生态足迹多样性是增强发展能力的有效途径;修正后的生态足迹模型及采用的发展能力测算方法可较准确评价区域的可持续发展状况.     

中国生态足迹研究进展及展望

2000年以来,中国生态足迹模型研究持续升温。研究内容包括理论探讨和实证研究。前者包括概念及内涵探讨、方法改进,内容涵盖可持续发展体系构建、经济社会发展、旅游业发展、资源开发等方面;后者涵盖了国家层面、大区域、省、地级市和县。主要问题有假设条件单薄,存在结论偏差;评价模型静态,参数弹性不足;研究领域较窄,研究尺度偏大;东中部研究多,西部研究欠缺。未来研究方向为细化指标体系,区分消费生态足迹和生产生态足迹：加强学科合作,根据区域特点进行主要参数调整;拓展应用领域,加强微观尺度研究;强化模型预测性,重视西部生态足迹研究。     

基于生态足迹模型的山西省生态评价

生态足迹是定量评价区域生态状况和可持续发展能力的重要模型.本文利用生态足迹模型对2011年的山西省生态足迹供需量进行计算与分析.结果显示2011年山西省的生态供需状况严重失衡,人均生态足迹需求量为5.677 7 hm2,而人均生态承载力仅为0.755 8 hm2;山西省该年处于不可持续发展状态,人均生态赤字高达4.921 9 hm2;全省的生态需求结构以能源消费需求量为重心,特别是煤炭资源;生态供给结构则以耕地为主,林地、建设用地次之.     

新疆乌苏市生态足迹演变与可持续发展诊断

目的定量研究干旱区典型绿洲乌苏市生态足迹演变及可持续发展进程。方法采用衡量可持续发展的生态足迹模型方法。结果乌苏市从1990年到2003年,人均生态足迹不断增加,人均生态承载力不断减少,该地区13a间人均生态足迹供需经历了盈余、赤字、逐年恶化的变化;资源利用效益、生态足迹多样性、发展能力等稳步提高;当前乌苏市生态经济系统处于不可持续发展状态。结论乌苏市可持续发展现状及动态变化在西北干旱区较为典型,西北干旱区各区域生态经济系统多年以来,基本经历了人均生态足迹不断增加、人均生态承载力却不断减少、人均生态足迹供需由盈余到出现赤字且逐年恶化的变化。     

内蒙古毛乌素沙地生态足迹及驱动因素

生态足迹模型的提出为评价区域可持续发展提供了有效方法.基于净初级生产力(NPP)首次构建了内蒙古毛乌素沙地均衡因子和产量因子,进而采用生态足迹模型核算了其1999-2018年生态足迹、生态承载力.并结合2018年土地利用数据及NPP-VIIRS夜间灯光数据揭示了内蒙古毛乌素沙地生态足迹及生态承载力的空间分布,最后分析其...     

基于能值生态足迹模型的内蒙古自治区生态承载力研究

利用能值生态足迹的计算方法,研究了内蒙古自治区2005年的生态足迹和生态承载力.结果表明:人均能值足迹为9.11 hm~2/cap,人均能值承载力为3.77 hm~2/cap,生态赤字为5.34 hm~2/cap,而利用传统生态足迹模型计算的结果为生态足迹3.43 hm~2/cap,生态承载力1.18 hm~2/cap,生态赤字为2.25 hm~2/cap,内蒙古自治区的发展处在一种不可持续的状态;能值足迹模型在一定程度上克服了传统生态足迹模型的缺陷,仍然存在一些不足.     

广东省肇庆市生态足迹

通过生态足迹的概念和模型的引入,阐明肇庆市生态足迹研究的必要性及紧迫性。并以肇庆市2003生态足迹研究为基础,进一步分析了1990-2003年间肇庆市生态足迹的变化趋势。结果表明,肇庆市人均生态足迹和生态赤字呈不断上升的趋势,人均生态足迹高于人均生态承载力,人类对自然的利用程度已经超过了生态承载力范围,区域生态环境目前处于不可持续发展的状态。     

生态足迹模型对旅游环境承载力计算的应用

在M．Wackernagel于1996年提出的生态足迹模型和理论的基础上创建了旅游者生态足迹的模型,应用该模型以中国1999年各个地区的生态足迹为基础数据,对旅游者生态足迹进行了计算和分析,结果表明：中国1999年大部分地区为旅游生态赤字,旅游业处于相对不可持续发展状态。可见旅游者生态足迹模型是计算旅游环境承载力的有效方法。     

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