首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献,搜索用时 62 毫秒
1.
环境问题已成为全球性的问题,环境质量与经济发展之间的关系受到了广泛关注.描述民族地区工业污染状况的同时,对其工业“三废“排放现状和环境保护能力状况进行分析,并提出了转变经济增长方式、发展环保产业、发展循环经济等改善民族地区工业污染状况的对策.  相似文献   

2.
通过选取我国1990—2006年环境污染、生态环境与经济发展方面的指标数据,检验我国环境质量和经济增长之间的因果关系后,建立了我国环境与经济之间相互影响关系模型,量化分析了环境与经济之间的相互影响作用。分析结果表明我国经济增长是环境质量变化的格兰杰原因,环境质量的变化不是经济增长的格兰杰原因;经济增长和环境质量具有相互影响的关系。  相似文献   

3.
本工作基于上海市川沙地区的实际全面调查,对当地环境质量与人群健康水平进行了客观评价,并进一步运用主成分——因子分析法探索了各环境介质之间,经济与环境质量之间,以及环境质量与人群健康水平之间的相互影响。  相似文献   

4.
本工作基于上海市川沙地区的实际全面调查,对当地环境质量与人群健康水平进行了客观评价,并进一步运用主成分——因子分析法探索了各环境介质之间,经济与环境质量之间,以及环境质量与人群健康水平之间的相互影响。  相似文献   

5.
简述了我国环境质量与经济发展的现状,并指出环境质量与经济发展的库兹涅茨曲线的不足。在此基础上提出了利用生态学模型研究环境质量与经济发展之间的变化关系。同时,使用我国近年来的经济与环境统计数据进行了探讨,提出了环境质量与经济发展的多阶段成长对策。  相似文献   

6.
以7个民族地区为研究对象,基于2006-2015年间的面板数据,运用格兰杰因果检验方法,对民族地区的能源消费总量、能源结构与经济增长的互动及响应进行了分析。研究结果表明:民族地区经济增长是能源消费的单向因果关系,经济增长与能源消费出现相对脱钩;能源消费结构与能源消费、经济增长之间并不存在格兰杰因果关系。民族地区的能源消费总量、结构与经济增长之间的交互影响存在着方向及程度上的差异。  相似文献   

7.
基于四川省1985-2005年的时间序列数据和21个地市州1999-2005年的面板数据,研究了四川经济增长和环境间的关系.文章的主要结论是:就本文所考察的时期,总体上四川省环境污染和经济增长间的关系不存在库兹涅茨倒U型关系.面板数据分析发现,对于废气排放量这一环境指标,环境库兹涅茨曲线假说成立,即经济增长起初会造成环境质量恶化,但到达一个转折点后,经济增长将会改善环境污染状况.并且证实目前四川尚未达到转折点.但是对于工业废水排放量指标,环境库兹涅茨曲线假说不成立.文章认为,尽管研究表明经济增长最终会改善环境质量,但没有理由相信这一过程会自动发生,收入增长与环境退化之间的负相关关系事实上是通过政策响应(policyresponse)来实现的.促使EKC进入下降阶段的主要原因是技术进步和经济结构变化所带来的高污染经济活动的转移,如高污染的重化工业逐渐向低污染的高技术工业过渡,工业经济逐步被服务经济所取代,等.如果减少公共政策的作用,结构转移并不足以保证经济增长必然伴随环境质量的改善.本文还考察了地理禀赋、技术、工业结构和人口密度对四川各地区经济增长和环境关系的影响,结果表明这些因素都对一个地区经济增长和环境关系产生影响.  相似文献   

8.
本文根据武汉地区的经济发展与环境质量近十年的状况,借用环境库兹涅茨曲线,分析了武汉地区经济的发展与环境的相关关系。结果显示,多数环境质量指标随着经济增长具有倒U或递减特征。  相似文献   

9.
环境库兹涅茨曲线自90年代初提出以来,便成为了研究经济增长与环境质量之间关系的热点。于是便出现了两种观点即环境库兹涅茨曲线支持论和不支持论。支持论者认为随着经济增长环境先变坏后变好,它们之间能够自发的转化。不支持论者则得出环境库兹涅茨曲线有很多种形状,即同步型,U型与N型。  相似文献   

10.
本文第一部分阐述了人类的起源、发展、自然生态环境与民族的产生、发展的关系等。第二部分,总结了当今世界几种民族经济的文化类型,探讨了不同经济文化类型与之相适应的民族教育之间的关系。  相似文献   

11.
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.  相似文献   

12.
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.  相似文献   

13.
王慧 《科技信息》2008,(10):240-240
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.  相似文献   

14.
The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3~4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰~ -7.8‰, PDB) and matrix dolomites (-6.6‰~ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084~0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078~0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.  相似文献   

15.
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.  相似文献   

16.
以AC-13级配为基础,将橡胶颗粒代替部分集料掺入混合料中,以低温弯曲试验为评价方法对不同橡胶颗粒掺量下沥青混合料的低温抗裂性进行研究,并引入应变能密度值对混合料的低温抗裂性进行综合评价.试验结果表明:橡胶颗粒沥青混合料试件的破坏微应变均超过2 300,满足冬寒区的技术指标;无论是否掺加橡胶颗粒,随着温度的下降,沥青混合料破坏时的最大弯拉强度增大,弯拉应变降低,劲度模量增大;弯曲应变能密度在胶粒掺量为1%左右时具有较大的弯曲应变能密度值,此时橡胶颗粒沥青混合料具有较好的低温抗裂性.  相似文献   

17.
AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…  相似文献   

18.
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。  相似文献   

19.
Quality traits in wheat (Triticum aestirum L.) were studied by quantitative trait locus (QTL) analysis in a recombinant inbred line (RIL) population, a set of 131 lines derived from Chuan 35050 × Shannong 483 cross (ChSh). Grains from RILs were assayed for 21 quality traits related to protein and starch. A total of 35 putative QTLs for 19 traits with a single QTL explaining 7.99-40.52% of phenotypic variations were detected on 10 chromosomes, 1D, 2A, 2D, 3B, 3D, 5A, 6A, 6B, 6D, and 7B. The additive effects of 30 QTLs were positive, contributed by Chuan 35050, the remaining 5 QTLs were negative with the additive effect contributed by Shannong 483. For protein traits, 15 QTLs were obtained and most of them were located on chromosomes 1 D, 3B and 6D, while 20 QTLs for starch traits were detected and most of them were located on chromosomes 3D, 6B and 7B. Only 7 QTLs for protein and starch traits were co-located in three regions on chromosomes 1D, 2A and 2D. These protein and starch trait QTLs showed a distinct distribution pattern in certain regions and chromosomes. Twenty-two QTLs were clustered in 6 regions of 5 chromosomes. Two QTL clusters for protein traits were located on chromosomes 1D and 3B, respectively, three clusters for starch traits on chromosomes 3D, 6B and 7B, and one cluster including protein and starch traits on chromosome 1D.  相似文献   

20.
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.  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号