天津中心城区居住空间分异现象研究

一、相关概念解释居住空间分异,借用人类生态学的概念解释,是由于城市居民的职业类型、收入水平、社会地位及文化背景等方面的差异而产生的不同社会阶层相对集聚的居住区,也就是指具有不同特性的居民随着社会经济的发展各自聚居而形成的城市居住空间分化的现象。通常来说,经济越发达的城市,     

On minimum <Emphasis Type="Italic">m</Emphasis>-connected <Emphasis Type="Italic">k</Emphasis>-dominating set problem in unit disc graphs

Minimum m-connected k-dominating set problem is as follows: Given a graph G=(V,E) and two natural numbers m and k, find a subset S⊆V of minimal size such that every vertex in V∖S is adjacent to at least k vertices in S and the induced graph of S is m-connected. In this paper we study this problem with unit disc graphs and small m, which is motivated by the design of fault-tolerant virtual backbone for wireless sensor networks. We propose two approximation algorithms with constant performance ratios for m≤2. We also discuss how to design approximation algorithms for the problem with arbitrarily large m. This work was supported in part by the Research Grants Council of Hong Kong under Grant No. CityU 1165/04E, the National Natural Science Foundation of China under Grant No. 70221001, 10531070 and 10771209.     

嘉陵江流域旅游开发初探

一、嘉陵江自然地理状况 嘉陵江发源于秦岭南坡的凉水沟源,流经秦岭山地和四川盆地,于重庆市朝天门汇入长江,全长1119公里,为长江第二大支流,仅次于汉江,流域面积16万平方公里,年径流量670亿立方米.嘉陵江流域地势是西、北、东3面高而南东低,干流北跨秦巴山地,南延至四川盆地腹部.四川省广元市元坝区昭化镇以上为上游,长357公里.     

基于区域高校生源差异定位的批判性思维培养机制探析

使大学生获得批判性思维的能力具有十分重要的意义,批判性思维可使他们在认知社会发展现状时,能获得客体主体化的能动反映;同时,将批判性思维贯穿于他们的专业知识应用之中,又能为促进社会发展提供主体客体化的成果.在开展批判性思维培养时,需重视区域生源的差异性问题,聚焦他们的思维短板,努力使其形成植根于区域社会经济发展的批判性思维能力.     

城市意象的再生——扬州古运河景观改造的理念创新

扬州是国务院首批公布的历史文化名城之一,具有2500年的历史文化积淀。春秋时代吴王筑邗城,开创了扬州的城市历史。汉代以广陵城为中心,发展出繁荣的区域文化。隋唐时代南北运河的开通,使扬州成为中国经济最发达的国际都市,唐代的扬州是国家漕运中心和盐、铁转运中心,商贾如云,极尽繁华,“雄富冠天下”,与京都长安并称,有“北长安、南扬州”之说。     

企业治理权的配置:内外部治理的成本收益假说

内外部治理的成本收益假说说明利益相关者的内部治理权和外部治理权存在着一定的替代性关系,而影响这种替代关系的关键要素是非专有的专用性资产、内部治理成本和外部治理成本。     

庐山风景名胜区森林景观多样性现状分析与发展对策

在ARCVIEWGIS软件进行数据处理的基础上,针对庐山风景名胜区森林结构和类型单一、景观破碎化严重、郁闭度较大等问题,提出结合旅游项目,加强对森林景观的科学管理;根据优势度、破碎度与郁闭度综合情况,选择典型树种进行林相整合改造;发挥公众参与优势,严把质量关;加强森林资源保护等,提出森林景观多样性的发展对策。     

Impact Factors and Risk Analysis of Tropical Cyclones on a Highway Network

Coastal areas typically have high social and economic development and are likely to suffer huge losses due to tropical cyclones. These cyclones have a great impact on the transportation network, but there have been a limited number of studies about tropical‐cyclone‐induced transportation network functional damages, especially in Asia. This study develops an innovative measurement and analytical tool for highway network functional damage and risk in the context of a tropical cyclone, with which we explored the critical spatial characteristics of tropical cyclones with regard to functional damage to a highway network by developing linear regression models to quantify their relationship. Furthermore, we assessed the network's functional risk and calculated the return periods under different damage levels. In our analyses, we consider the real‐world highway network of Hainan province, China. Our results illustrate that the most important spatial characteristics were location (in particular, the midlands), travel distance, landfalling status, and origin coordinates. However, the trajectory direction did not obviously affect the results. Our analyses indicate that the highway network of Hainan province may suffer from a 90% functional damage scenario every 4.28 years. These results have critical policy implications for the transport sector in reference to emergency planning and disaster reduction.     

我国猪肉价格与CPI波动之关系研究

猪肉作为我国居民的基础消费品之一,近年来其价格呈现出大致以三年为周期的剧烈波动态势,直接影响到人民的生活质量,同时也对CPI产生一定的影响。通过实证分析发现,猪肉价格波动周期与CPI波动周期具有一定的相关性,并且这种关系正在逐步增强;同时,受到诸多因素的影响,使得猪肉价格波动幅度加大,对于CPI起到一定的引导作用。     

基于ARIMA模型的中部地区经济人口承载力研究——兼论承接沿海产业转移能力

目前,沿海产业向中西部地区转移已成国家关注的重大问题,而中部地区经济承载力问题是科学承接和布局沿海产业转移的基本依据.本文利用中部六省1978-2010年的三次产业就业人数数据,建立时间序列ARIMA模型,对各省2011-2015年就业人数进行预测,以此反映中部地区未来经济人口承载规模,并与广东省三产就业人数进行对比分析,得出以下几点结论:(1)中部六省经济人口承载规模差异显著;(2)中部六省经济发展能力差异显著;(3)中部六省经济人口承载力相对较弱,阻滞了产业大规模转移;(4)中部地区经济人口承载规模尚有很大提升空间.