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1.
依据中原城市群2000—2013年县域单元城镇居民收入统计数据,采用数理统计和空间统计分析法对中原城市群城镇居民收入水平区域差异的时空变化态势进行研究.研究表明:(1)中原城市群城镇居民收入总体差异明显,在空间上表现出集聚分布态势,整体上呈现出"中心—外围"的空间结构特征;(2)2000—2013年间中原城市群城镇居民收入水平相对差异表现出先上升后下降的变化趋势,在2008年达到最大值,而绝对差异则持续增大;(3)居民收入高值集聚区主要分布在以郑州和洛阳为中心的区域,低值集聚区主要分布于中原城市群北部、东部、南部等外围区域,两极差异日益增强.最后,从产业结构、城镇化水平、区位优势、人口素质以及政策机制5个方面对城镇居民收入水平区域差异的影响机制进行分析并提出相关建议.  相似文献   

2.
运用Moran’sI和Getis.OrdGf’指数,以某区县域单元为对象,选取2000-2010年人均GDP及其相对增长量为指标,对研究区经济时空集聚过程进行了分析.结果表明:(1)研究区人均GDP县域经济总体上呈现出较强的空间自相关性,且空间自相关态势在2000--2010年间逐年加强(Moran’SI从0.18增长到0.41),区域形成了北部高经济发展水平集聚区,而南部各县市单元则组成了低经济发展水平集聚区;(2)经济增长的空间格局呈现出较强的不稳定性,但与人均GDP的演化趋势较为一致.通过研究发现Moran’S,和Getis.OrdGf+指数能够较好透视区域经济发展格局时空演化过程,也肯定了空间自相关方法在区域经济发展规划制定中的潜在价值.  相似文献   

3.
以“森林人家”为研究对象,运用标准差椭圆(SDE)、核密度估计(KDE)和空间自相关(ESDA)等方法,基于安徽省省域以及皖南、皖中和皖北三大区域等多个尺度对2008年、 2014年和2016年安徽省“森林人家”空间格局进行点、面多维测度,并利用地理探测器解析不同因素对全省以及三大区域“森林人家”空间格局演化的影响强度.结果表明:安徽省“森林人家”整体呈南密北疏空间态势;皖南地区一直处于全省“森林人家”热点地区,冷热点区域格局大体呈现南热北冷分布格局;影响全省“森林人家”分异格局的核心因素主要有旅游总收入、国内游客人数、人口密度等,但影响三大区域森林人家空间格局的核心因素存在时空差异性.  相似文献   

4.
中国建设用地利用强度时空演化及其驱动机制分析   总被引:1,自引:0,他引:1  
以中国4个五年发展战略的截止年份为时间节点, 基于径向函数(RBF)神经网络模型测度2000, 2005, 2010和2015年中国337个市级行政单元(不含港澳台地区)建设用地的利用强度, 并利用探索性空间数据分析模型(ESDA)分析其时空演变格局, 运用地理加权回归模型(GWR)分析中国建设用地利用强度时空分异的主要驱动因素。结果表明: 1) 2000—2015年, 中国建设用地利用强度整体上呈上升趋势, 且空间差异显著, 高强度的利用水平集中在环渤海经济区、各大沿海城市和省会城市; 2) 中国建设用地利用强度呈现空间自相关性, 且全局分异格局与冷热点分布格局及空间异质性的态势基本上吻合; 3) 中国建设用地利用强度的空间格局演变主要受经济发展水平、产业结构、城市化水平以及政府经济调控4 种因素影响, 影响程度的排序为城市化水平<产业结构<经济发展水平<政府经济调控。  相似文献   

5.
基于2000-2015年SPOT-VEGETATION归一化植被指数(normalized differential vegetation index, NDVI)数据,采用趋势分析、空间转移矩阵等方法分析了山西省NDVI时空变化特征,并使用地理探测器模型分析了自然因子对NDVI空间分异及变化趋势的驱动作用。结果表明:(1)2000-2015年山西省植被覆盖整体较好,年均NDVI为0.65,春季NDVI增长幅度最明显,冬季增长幅度最小;(2)2000-2015年山西省NDVI呈增加趋势,年平均增长率为0.006/a, NDVI变化趋势以极显著缓慢增长为主,占山西省面积的51.92%;极显著快速增长占山西省面积的36.08%,整体趋势向好,但可持续性不强;NDVI≥0.8的区域面积大幅增加,主要是由低一级植被覆盖转化而来;(3)地貌类型对2000-2015年山西省NDVI空间分异及变化趋势的单因子解释力均是最高的。对NDVI空间分异影响最显著的是年平均降水量和≥0℃积温双因子组合;地貌类型和湿润指数的非线性增强交互作用对NDVI的变化趋势影响最为显著。  相似文献   

6.
行业收入分配是我国收入分配改革的重要内容。本文首先对我国改革开放以来的收入分配进行了阶段描述分析,然后探计了影响我国行业收入分配的五大因素,最后采用面板数据模型进行了实证检验,结论是:人力资本因素、行业劳动生产率与行业收入水平之间均存在正相关关系;而行业经济发展水平、外资利用程度与行业收入水平之间的相关关系则不显著。  相似文献   

7.
把就业弹性和信息熵作为测度就业结构均衡度的指标,并将其运用于安徽省就业结构变化特征的分析中.分析结果显示,就业弹性方面:经济增长相对稳定时,第一产业就业弹性总体为负值,二三产业就业弹性同向变化且为正值.行业就业结构方面:安徽省就业结构的熵值变化反映出全省多数行业仍然处于扩大规模的加速发展阶段,就业结构均衡性增强;安徽省17个地市行业就业结构信息熵在时间维和空间维上具有区域分异规律.  相似文献   

8.
重庆市主城区森林景观斑块时空动态特征   总被引:2,自引:0,他引:2  
本文以重庆主城区为研究对象,借助景观生态学理论,利用1986、1995、2000和2006年重庆主城区遥感影像数据及相关辅助数据,运用人机交互目视解译方法以及地理信息系统的空间分析和数理统计功能,建立重庆主城区森林景观数据库,对主城区森林景观格局的景观时空演变及地理空间分异特征与规律进行定量化分析.经分析得出: 1)研究区森林景观变化:在研究时段的20年间,研究区森林景观面积1986-2000年逐年递减,2000-2006年有所增加;森林景观破碎度总体上呈降低趋势,局部地区受人类活动影响破碎化加剧;斑块边界褶皱化程度加剧,斑块形状趋向复杂化; 2)研究区斑块动态变化:1986-1995年,森林斑块等级变化不明显,处于相对稳定状态;1995-2000年,小斑块变大的趋势明显; 2000-2006年,斑块各个等级间变化最为剧烈,数量和面积上均相对较大,人类活动作用明显; 3)森林景观空间格局演化主要受地形条件的控制,并随城市化进程受人类活动影响程度不断加深而时刻变化.  相似文献   

9.
基于ESDA的空间数据分析方法,研究了1996—2008年间安徽省县域经济空间格局的分异演化规律,结果表明:安徽省县域经济发展的空间自相关性明显,但空间格局较为分散,各市区对周边县域经济的带动力不强,存在极化效应,主要体现在"皖江城市带"空间集聚.而劳动力、人力资本、固定资产投资、政府支出、农业化和农民生活水平是导致安徽省县域经济空间分异的主要原因.  相似文献   

10.
松嫩平原西部生态脆弱区土地利用时空变化研究   总被引:13,自引:0,他引:13  
基于1986年和2000年2期TM影像资料,在空间图形库系统支持下,分析了该区土地利用数量变化、土地利用空间组成变化、空间邻接关系变化和变化主导类型,揭示了1986-2000年间松嫩平原西部生态脆弱土地利用时空变化特征。结果表明,此间林地、草地不断破碎化,耕地、盐碱地从整体上呈现集中化特征。耕地与草地、草地与盐碱地空间相邻度增大,草地开垦过快和土地盐碱化日益严重。土地利用空间变化内在过程基本以旱地-水田,草地-旱地,草地-未利用地相互转化为主导。  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.
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   

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 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   

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.
There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.  相似文献   

17.
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   

18.
In the 19th century the society was controlled by men, and women were just appendants of them, they had not any rights and freedom. But Jane was an exception, she showed some characteristics of early feminist. Jane showed her characteristics of feminism in three aspects: rebellion, equality, and independence. These characteristics were helpful to her success, and feminism is the only way out for women of that time.  相似文献   

19.
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   

20.
The non-orthogonal localized molecular orbital(NOLMO)is the most localized representation of electronic degrees of freedom.As such,NOLMOs are thus potentially the most efficient for linear scaling calculations of electronic structures for large systems.However,direct ab initio calculations with NOLMO have not been fully implemented and widely used,partly because of the slow convergence issue in the optimization of NOLMO.We devel-  相似文献   

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