基于家庭区位需求的城市住房价格模拟分析

目前关于城市住房价格异质性和影响因素研究多侧重于空间位置分析,从城市系统角度刻画住房价格分异现象有待进一步探索。根据“土地利用—交通相互作用理论”,城市空间的发展过程是各类活动通过交通相互作用的过程,本文构建了交通可达性模型,综合全市经济活动空间分布和交通网络评价城市区位条件,并以北京为例,从就业、教育、消费、医疗服务等各方面评价了城市区位条件,在此基础上依据家庭成员结构,模拟分析了家庭区位需求对住房价格的影响。案例研究表明,本模型对房价的模拟可以在全市范围内达到很好的效果;家庭的区位选择决定着住房价格的空间格局;各类活动中就业对北京市房价分布影响最为显著,其次是消费、教育,而医疗服务对住房价格影响相对较弱。此外,本文所提出的模型系统阐述了城市经济活动分布格局对住房价格的影响,经济活动分布发生变化时模拟结果随之变化,因此,本模型可以进一步拓展用于“以业带人”政策实验,模拟分析疏散各类经济活动后住房价格的变化,也为城市房价及土地市场分析研究提供模型方法上的参考。     

Seismic evidence for thick and underplated late Archaean crust of eastern Dharwar craton

The deep crustal structure of eastern Dharwar craton has been investigated through τ-p extremal inversion of P-wave travel times from a network of seismographs recording quarry blasts. Travel times have been observed in the distance range 30–250 km in a laterally homogeneous lithospheric segment Main features of the inferred velocity-depth relationship include: (a) 29 km thick combined upper and middle crust velocity varying from 6 km/s to 7 km/s, with no observable velocity discontinuity in this depth range; (b) a lower crust (∼ 29–41 km) with velocity increasing from 7.0 to 7.3 km/s; (c) an average upper mantle velocity of 8.1 km/s; and (d) presence of a 12 km thick high velocity crustal layer (7.4 – 7.8 km/s) in the depth range 41–53 km, with a distinct velocity gradient marking a velocity increase of 0.4 km/s. The anomalous 53 km thick crust is viewed as a consequence of magmatic underplating at the base of the crust in the process of cratonization of the eastern Dharwar craton during late Archaean. The underplated material reflects here with the velocity of 7–3 to 7–8 km/s below the depth of 40 km. Our proposition of magmatic underplating is also supported by the presence of large scale I-granitoid, a product of partial melting of the upper mantle material.     

Web2.0下基于WebGIS的旅游博客网站构建

Web2.0的环境下,旅游博客网站将向侧重于旅游者的参与性和交互性方向发展,但现有的旅游博客平台的交互性和信息的时空性均不强.基于ASP.NET平台,结合开放Google地图Gmap3 API 集成应用,开发了基于WebGIS的旅游博客系统.系统分旅行线路规划和旅游日志2个子系统,所有应用均围绕Google地图展开,实现多旅游目的地的查找、线路安排和导航功能,而撰写的旅游日志将围绕Google地图在旅游景点坐标处进行标识,同时集成了文字、图片、视频等多媒体信息.系统具有操作简单、交互性强、体验性好的特点.     

华南地区近震走时表在广东的应用

利用由华南地区近震走时表测定的发震时刻、震中位置和震相走时等地震参数,检验了该表在广东地区的应用效果。结果表明,华南地区近震走时表不仅适用于广东地区,而且在精度和准确度方面均优于J-B表。     

日本国际旅游业的特点及新动向

日本的国际旅游业在世界旅游业发达国家中独具特色,20世纪60年代为界,日本旅游业经历了以入境游为主到以出境游为主的变化,出境游大大超过入境游。本文在介绍和分析日本国际旅游业的发展变化过程及其主要特征的基础上,对新世纪前后日本国际旅游业发展的新动向作了简要介绍分析。     

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Constraining the anisotropy structure of the crust by joint inversion of seismic reflection travel times and wave polarizations

In the context of wide-angle seismic profiling, the determination of the physical properties of the Earth crust, such as the elastic layer depth and seismic velocity, is often performed by inversion of P- and/or S-phases propagation data supplying the geometry of the medium (reflector depths) or any other structural parameter (P- or S-wave velocity, density...). Moreover, the inversion for velocity structure and interfaces is commonly performed using only seismic reflection travel times and/or crustal phase amplitudes in isotropic media. But it is very important to utilize more available information to constrain the non-uniqueness of the solution. In this paper, we present a simultaneous inversion method of seismic reflection travel times and polarizations data of transient elastic waves in stratified media to reconstruct not only layer depth and vertical P-wave velocity but also the anisotropy feature of the crust based on the estimation of the Thomsen’s parameters. We carry out a checking with synthetic data, comparing the inversion results obtained by anisotropic travel-time inversion to the results derived by joint inversion of seismic reflection travel times and polarizations data. The comparison proves that the first procedure leads to biased anisotropic models, while the second one fits nearly the real model. This makes the joint inversion method feasible. Finally, we investigate the geometry, P-wave velocity structure and anisotropy of the crust beneath Southeastern China by applying the proposed inversion method to previously acquired wide-angle seismic data. In this case, the anisotropy signature provides clear evidence that the Jiangshan-Shaoxing fault is the natural boundary between the Yangtze and Cathaysia blocks.     

代理服务器在局域网中的应用

本文阐述了代理服务器的网络结构及其工作原理，代理服务器及客户端的网络配置，实现内部网与Internet网的互通，并简单分析晋城市气象局在采用2MB光纤接入Internet网时两种不同网络布线的利弊，     

高铁对京津冀地区可达性及经济联系的影响

考虑市内交通衔接和乘客出行行为选择,通过加权平均旅行时间、经济潜力和空间自相关分析方法相结合,从不同尺度分析高铁建设对京津冀地区可达性的变化和经济活动空间分布格局的演变。结果表明：① 京津冀地区市域和县域的可达性水平得到明显的改善,形成以京津、京广、京沪方向为轴线向外扩展的不规则环状分布格局,且可达性水平呈现南高、北低的特征。② 高铁对沿线核心城市的经济潜力提升作用明显高于边缘城市,呈现出由中心向外圈层式递减,且以北京为顶点的“倒V”的空间格局。③ 随着可达性时间范围的扩大,京津冀区县的经济活动的空间集聚逐渐弱化,且最优辐射范围在3.5 h以内。     

Book Reviews

Books reviewed: Rayner, John N. Dynamic Climatology: Basis in Mathematics and Physics Blair, Alasdair and Hitchcock, David. Environment and Business Black, Brian. Petrolia: The Landscape of America's First Oil Boom Sharma, Martha B. and Elbow, Gary S. Using Internet Primary Sources to Teach Critical Thinking Skills in Geography Klemen?i?, Mladen (ed.) Atlas Europe Kliot, Nurit and Newman, David Geopolitics at the End of the Twentieth Century: The Changing World Political Map O’Sullivan, Patrick M. The Geography of War in the Post – Cold War World Duany, Andres, Plater‐Zyberk, Elizabeth, and Speck, Jeff. Suburban Nation: The Rise of Sprawl and the Decline of the American Dream Kayden, Jerold S. Privately Owned Public Space: The New York City Experience Borjas, George J. Heaven's Door: Immigration Policy and the American Economy Andreas, Peter. Border Games: Policing the U.S.‐Mexico Divide England, John. Retail Impact Assessment: A Guide to Best Practice Outtes, Joel. O Recife: Gënese do Urbanismo, 1927 – 1943 (Recife: The Birth of Urbanism, 1927 –1943) Njoh, Ambe J. Urban Planning, Housing, and Spatial Structures in Sub‐Saharan Africa: Nature, Impact, and Development Implications of Exogenous Forces Hanson, Philip and Bradshaw, Michael (eds.) Regional Economic Change in Russia Pyne, Stephen J. Book Review Commentary: A response to Terence Young's review of Stephen J. Pyne's How the Canyon Became Grand