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.
利用2000-2009年统计数据,构建了山西城市化与生态环境综合指标体系.在对城市化综合发展水平与生态环境质量分析的基础上,建立了城市化发展与生态环境的协调度模型,对山西省不同年份城市化与生态环境的协调发展程度进行分析.研究结果表明:2000-2009年城市化综合水平逐步提高,生态环境综合质量呈波动性变化,即:2000-2003年山西省生态环境评价值呈现上升趋势,生态环境质量变好;从2003-2006年,生态环境评价值呈下降趋势,生态环境质量变差;2006-2009年生态环境综合评价值呈上升趋势,生态环境质量变好.从协调发展度来看,城市化与生态环境协调度呈波动性上升.从协调度发展类型来看,山西省城市化与生态环境在2000-2009年期间1a失调,1a接近失调,4a基本协调,4a协调发展.总的来说,山西省的城市化与生态环境较为协调,处于协调阶段.  相似文献   

2.
以呼包鄂城市群为研究对象,通过构建城镇化与生态环境协调发展评价指标体系,运用综合评价模型、耦合度及耦合协调模型,对呼包鄂城市群城镇化与生态环境耦合协调发展的变化趋势展开分析.研究结果表明:呼包鄂城市群城镇化发展水平与生态环境协调水平不断提高,但生态环境水平滞后于城镇化发展水平;城镇化与生态环境协调发展水平逐步提高,耦合协调度由低度协调阶段发展为中度协调阶段,但协调发展程度仍然偏低.  相似文献   

3.
以安徽省为研究区域,从人口发展、经济发展、社会发展、生态环境、城乡统筹发展及开放程度等6个维度构建城镇化质量评价指标体系,在定量测算安徽省16个地级市2005年、2010年、2014年的城镇化质量的基础上,借助协调度模型对安徽省各地级市城镇化水平与质量的协调状况进行实证分析.研究表明:2005—2014年安徽省城镇化质量呈小幅度上升趋势,增长幅度为16.79%,经济发展、社会发展对城镇化质量的拉动作用较大;各地级市城镇化水平与质量协调度处于上升态势,由低度失调向多层次协调发展转变,但协调度的整体水平较低,截至2014年仍然有一半的城市处于弱度协调状态;各地级市城镇化水平与质量协调度空间差异显著,具有聚集特征,呈现"两高两低"空间分布格局.研究结果表明今后应将提高人口质量、改善生态环境、缩小城乡发展差距、提高开放程度等作为促进安徽省城镇化水平与质量协调发展的重要途径.  相似文献   

4.
考察高等教育与区域经济协调发展水平的重要途径是量化分析高等教育投入、产出与区域经济发展的协调度及其时空变化趋势。运用系统协调度和空间统计分析方法,从时间和空间两个维度研究我国省域高等教育投入、产出与地区经济发展的协调度及其空间分布特征。研究结果显示,高等教育与区域经济的协调度不断提升,但始终处于低水平状态。高等教育投入协调度呈现明显的"东部凸起""中部塌陷"特征,高等教育产出协调度呈现东高、西低、中部居中的梯度分布态势。高等教育协调度在相邻省域之间存在显著的空间正相关关系,局部空间依赖关系具有一定的稳定性。  相似文献   

5.
以西北地区(陕西、甘肃、青海、宁夏、新疆)为研究对象,通过构建2010-2020年绿色金融与生态环境指标体系进行耦合协调关系评价.并通过GM(1.1)灰色预测模型对两系统2021-2025年耦合协调度进行预测.结果表明:(1)两系统综合评价指数f(x)与g(y)均不断提高,但不同年份西北地区绿色金融与生态环境发展滞后类型不同,到2020年两系统综合评价指数基本达到一致水平;(2)西北地区绿色金融与生态环境系统耦合度长期处于拮抗阶段,耦合协调度在时间维度上由轻度失调发展到勉强协调阶段;(3)预测结果显示:未来5年两系统耦合协调度大致延续前11年的上升趋势,到2021年耦合协调度水平可达到初级协调,到2022年耦合协调度水平可达到中级协调.故此,根据两系统之间的耦合协调发展关系及预测水平,针对绿色金融与生态环境发展现状提出建设性建议,以期为西北地区各个省份发挥比较优势实现两系统协调发展提供理论依据.  相似文献   

6.
河北省作为京津冀协同发展的生态环境承载力地区,旅游产业的协同发展成为研究的重点和热点。通过构建旅游环境承载力评价指标体系,运用耦合度、协调发展度、系统协调发展度模型对案例地区进行分析。结果显示:1)河北省旅游环境综合承载指数呈现在波动中不断增长的变化趋势。2)旅游业发展指数、生态环境质量指数、经济发展指数与社会发展指数这4个指数基本呈现同步上升的趋势,表明河北省旅游产业复合生态系统基本处于协调发展的状态。3)从耦合协调度来看,整体上经历了较低水平的耦合阶段,拮抗阶段和磨合阶段,表现为从不协调到协调发展。目前处于关键的磨合阶段。  相似文献   

7.
武汉市城市化与生态环境协调发展定量评价与分析   总被引:1,自引:0,他引:1  
以武汉市为研究区域,构建了武汉市城市化、生态环境系统协调发展的评价指标体系.在对城市化综合水平与生态环境综合质量进行测度的基础上,运用层次分析法计算出了武汉市城市化与生态环境协调度.结果显示:2000年~2010年,武汉市城市化水平总体上呈现出增长趋势,但武汉市生态环境水平随着城市化的发展呈现出波动型的变化特征,总体呈现出先下降后上升的趋势;从近两年来看,武汉市城市化发展水平与生态环境发展水平差距在缩小.从协调度分析可知,2000年~2005年,协调度呈现出逐年下滑趋势,2006年~2010年,协调度呈现逐年回升的趋势,且呈现出较为稳定的状态.总的来看,武汉市城市化与生态环境协调性有待加强.  相似文献   

8.
钢铁工业是我国重要的基础工业,长江经济带作为我国钢铁工业发展的重要区域,开展长江经济带钢铁工业与生态环境、区域经济的耦合性研究,对于践行高质量发展理念和进行钢铁行业供给侧结构性改革有着重要的现实意义.论文以长江经济带为研究对象,通过构建钢铁工业—生态环境—区域经济(SER系统)耦合协调评价模型,选取2000年~2016年面板数据,进行耦合协调研究.研究表明:长江经济带SER系统耦合协调发展情况处于整体协调状态,耦合协调程度各省市分布不均.东部的耦合协调发展度明显高于中部和西部,江苏耦合协调发展度最高,贵州耦合协调度最低,浙江、湖北、湖南、安徽保持平稳,上海、重庆波动较大.  相似文献   

9.
厦门市生态环境与社会经济协调发展研究   总被引:1,自引:0,他引:1  
以厦门市全域为研究区域,通过采用熵值赋权法确定各项指标权重,建立厦门市生态环境与社会经济协调发展度评价模型,对该区域2003-2012年间生态环境、社会经济系统内部各要素层间的协调性及其两系统间的总体协调发展度进行了定量评价与分析.分析结果表明:厦门市生态环境系统、社会经济系统内部协调性整体良好,且两系统间协调发展状况总体呈现比较稳定的上升趋势,但二者协调发展进程较为缓慢,在近10 a间均属于中度失调发展类型.值得注意的是,在此期间两者的协调发展水平呈现出明显的阶段性特征,即2003-2007年为城市社会经济滞后型,2008年变为生态环境滞后型,2009-2010属于城市社会经济滞后型,2011-2012年又转变为生态环境滞后型,二者在相互协调发展中具有交替式上升的特征.  相似文献   

10.
文章以新疆昌吉市为研究对象,基于"P-S-R"模型、熵值法、综合指数法及耦合分析法评价2002-2015年昌吉市城镇化和生态环境耦合阶段及发展水平。结果表明:(1)城镇化质量与生态环境水平变化差异性明显。其中经济和社会城镇化对昌吉市城镇化综合水平影响最大,生态环境响应对生态环境综合水平影响最大。(2)城镇化和生态环境综合水平整体波动上升的演变趋势,两个系统发展水平差距呈现变小的趋势,耦合协调度在研究时期内总体水平相对较高,其变化范围是0.4419-0.8316。(3)城镇化与生态环境耦合协调度呈阶段性特征。2002年属于非协调阶段,其类型为衰退类-轻度失调城镇化滞后型;2003-2011年为转型期阶段,其类型分别为发展类-初级协调城镇化滞后型和中级协调发展类城镇化滞后型;2012-2015年属于协调阶段,其类型为发展类-良好协调城镇化滞后转向生态环境滞后型。  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.
何延凌 《科技信息》2008,(4):258-258
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.  相似文献   

15.
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   

16.
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   

17.
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   

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