用于VLBI数字基带转换的多相滤波技术研究

该文阐述了利用低通滤波器和多相滤波器技术实现VLBI数字基带转换的原理,建立了采用多相滤波器与FFT技术的数字基带转换系统的仿真模型;然后对本模型的算法复杂度进行了分析和比较;最后对该模型的正确性进行了仿真实验验证.     

广州中心城区基本医疗服务等级区域分布及其特征

以广州市最新一轮行政区划结果与医疗机构相关数据为基础,运用ARCGIS和SPSS软件,通过构建基本医疗服务优势度模型,对3项子指标(距离、质量、频率)在各个优势度等级区域进行对照分析.发现广州中心城区基本医疗服务等级区域分布具有如下特征:以老城区(越秀区、荔湾区、海珠区)组成团块状的高优势度区域为中心,优势度分值自中心向外围区域呈环状递减,且优势度高分值区域有向市区东部及北部延伸的趋势.基本医疗服务等级区域指标具有如下特征:①极高值区、高值区与极低值区3项子指标得分均衡;②中高值区、中值区和中低值区存在质量低下型特征,低值区尤甚:③在基本医疗服务良好区域,区域内医疗服务条件差异显著,具有距离低下型特征.     

Three‐dimensional vibration control of high‐tech facilities against earthquakes and microvibration using hybrid platform

High‐tech equipments engaged in the production of ultra‐precision products have very stringent vibration criteria for their functionality in normal operation conditions and their safety during an earthquake. Most previous investigations were based on simplified planar models of building structures, despite the fact that real ground motions and structures are always three‐dimensional. This paper hence presents a three‐dimensional analytical study of a hybrid platform on which high‐tech equipments are mounted for their vibration mitigation. The design methodology of the hybrid platform proposed in this study is based on dual‐level performance objectives for high‐tech equipments: safety against seismic hazard and functionality against traffic‐induced microvibration. The passive devices (represented by springs and viscous dampers) and the active actuators are designed, respectively, to meet vibration criteria corresponding to safety level and functionality level. A prototype three‐story building with high‐tech equipments installed on the second floor is selected in the case study to evaluate the effectiveness of the hybrid platform. The optimal location of the platform on the second building floor is determined during the design procedure in terms of the minimal H ₂ cost function of absolute velocity response. The simulation of the coupled actuator‐platform‐building system subjected to three‐dimensional ground motions indicates that the optimally designed hybrid platform can well achieve the dual target performance and effectively mitigate vibration at both ground motion levels. Copyright © 2009 John Wiley & Sons, Ltd.     

基于粗糙集的局部同位模式挖掘算法北大核心CSCD

通过空间同位模式挖掘可发现频繁发生在邻近位置的事件集合,为揭示地理现象间的共生规律提供重要的决策支持。由于空间同位模式存在空间异质性问题,已有方法不能很好地探测出空间同位模式分布的相近性区域。为此,本文从地理属性的相近性方向探测同位模式的分布区域,提出了基于粗糙集的局部空间同位模式挖掘方法。首先,从全局视角提取不频繁的空间同位模式作为候选的局部空间同位模式;然后,对候选同位模式的实例位置进行处理,将其分布的热点区域属性作为粗糙数据集,借助粗糙集探测局部空间同位模式自然的分布区域;最后,度量在这些局部区域的频繁程度,生成所有频繁的局部空间同位模式。通过试验与应用发现,该方法不仅可以探测局部空间同位模式分布的相近性区域,还能反映同位模式分布区域的地理属性信息。     

BOOK REVIEWS

Book Reviewed in this article: Geographical Aspects of Health and Disease in India . Rais Akhtar and A.T.A. Learmonth , eds . Antarctic Treaty System: An Assessment . Proceedings of a Workshop at Beardmore South Field Camp, Antarctica. American Electoral Mosaics . J. Clark Archer and Fred M. Shelley . Kompas op Suidwes-Afrika/Namibie . W.S. Barnard , ed . Jerusalem in the 19th Century: The Old City . Yehoshua Ben -Arieh . The World as a Total System . Kenneth E. Boulding . A Social History of Housing 1815–1985, Second Ed . John Burnett . Human Migration . W.A.V. Clark . Regional Population Projection Models . Andrei Rogers . The State of Population Theory: Forward from Malthus . David Coleman and Roger Schofield , eds . Imagining Tomorrow: History, Technology and the American Future . Joseph C. Corn , ed. Swidden Agriculture in Indonesia: The Subsistence Strategies of the Kalimantan Kantú . Michael R. Dove . Glacial Geologic Processes . David Drewry . Physics of Desertification . Farouk El -Baz and M.H.A. Hassan , eds . Housing the Homeless . Jon Erickson and Charles Wilhelm , eds . Settlement Patterns in Missouri: A Study of Population Origins, with a Wall Map . Russel L. Gerlach . Desert Development: Man and Technology in Sparselands . Yehuda Gradus , ed . Nuclear Winter. The Evidence and Risks . Owen Greene , Ian Percival and Irene Ridge . The Take-off of Suburbia and the Crisis of the Central City . Günter Heinritz and Elisabeth Lichtenberger , eds . Regional Input-Output Analysis . Geoffrey J. D. Hewings . Spatial Transportation Modeling . Christian Werner . The Atlas of Georgia . Thomas W. Hodler and Howard A. Schretter , eds . Latin America. 5th ed . Preston E. James and C.W. Minkel . Applied Remote Sensing . C.P. Lo . Localities, Class, and Gender . The Lancaster Regionalism Group . Urban Social Movements: The City after Castells . Stuart Lowe . Politics and Method . Doreen Massey and Richard Meegan , eds . Land Use . A. S. Mather . The Kingdom of Coal . Donald L. Miller and Richard E. Sharpless . The Presidio and Militia on the Northern Frontier of New Spain, A Documentary History, Vol. 1: 1570–1700 . Thomas H. Naylor and Charles W. Polzer , S.J., comps . and eds . Nuclear Power: Siting and Safety . Stan Openshaw . The Central African Republic: The Continent's Hidden Heart . Thomas O'Toole . Environmental and Dynamic Geomorphology . Márton Pécsi , ed . Remote Sensing Principles and Interpretation . Floyd F. Sabins , Jr . Acid Rain and Friendly Neighbors: The Policy Dispute between Canada and the United States . Jurgen Schmandt and Hilliard Roderick , eds . Earth's Changing Surface: An Introduction to Geomorphology . M.J. Selby . International Migration: The Female Experience . Rita J. Simon and Caroline B. Brettell , eds . On Geography and Its History . D.R. Stoddart . Transportation Networks: A Quantitative Approach . D. Teodorovic . Processes in Physical Geography . R.D. Thompson , A.M. Mannion , C.W. Mitchell , M. Parry , J.R.G. Townshend . Imaging Radar for Resources Surveys . J.W. Trevett . Dominance and Affection: The Making of Pets . Yi -Fu Tuan . Capturing the Horizon. The Historical Geography of Transportation since the Transportation Revolution of the Sixteenth Century . James E. Vance , Jr . Nations at Risk: The Impact of the Computer Revolution . Edward Yourdon .     

时尚装修营造健康医疗环境

医疗建筑最终目的是要营造一个合理、舒适的就医环境，装饰装修是使其实现的最后一个重要环节。医疗建筑的每个功能分区都有它特有的属性，怎样设计才能既满足使用要求又能满足个性化需求？本文进行了较全面的概述。     

论郁证的认知与调治——节选自国医大师孙光荣教授在“世界中医药联合会心身医学专业委员会第七届学术年会”上的讲话

中医学之郁证,涵盖了现代医学之“抑郁症”。对该病的认知与调治,已成为心身医学高度重视和共同攻克的重大课题。国医大师孙光荣教授认为,中医心身医学认知郁证的源泉是“天人合一”观;而中医调治郁证必须遵循“形神合一”观。孙老认为,中医临床必须具备3个基本思维：四诊审证、审证求因的“求解思维”,求因明机、明机立法的“上升思维”,立法组方、组方用药的“决断思维”。因此,中医心身医学的医、护、药工作者,在郁证的调治过程中首先要注重以“神形”为主线,把握20个“天”“人”元素,运用“求解思维”“上升思维”进行心身疾病的辨证,并做到“五注重”,方可达到事半功倍的良好效果。     

重庆市主城区休闲设施空间格局变化及其解释

休闲设施作为城市休闲空间的物质形态载体,为城市居民提供多种休闲娱乐功能。依托城市的不断发展,休闲设施也随之呈现出空间结构异质性。基于POI大数据,运用GIS平台及地理探测器,对重庆主城区休闲设施空间格局进行探析,结果表明：（1）在数量特征上,研究区内休闲设施总量呈上升趋势,随距离变化表现出明显空间尺度依赖,各类设施在不同空间尺度下的分布数量存在差异。（2）休闲设施总体空间分布呈显著集聚特征,由于设施总量逐年增加,各类休闲设施空间集聚程度逐渐降低。（3）休闲设施整体为“大聚集,小分散”的多中心分布态势,并逐步由集聚中心向城市外围区域扩张。康娱游憩类演化特征与总体近似,文化休闲类设施集中分布于沙坪坝东南部与渝中区两江交汇处,休闲旅游类表现为“大分散,小集聚”的空间特征,专项休闲类呈带状连片分布态势。（4）常住人口密度、道路密度、距离市中心距离、旅游收入等是重庆市主城区休闲设施空间格局变化的重要影响因素,各影响因子在三个时间节点解释程度有所不同。对于休闲设施格局变化的研究旨在为休闲设施经营者投资选址提供参考,为政府决策者合理布局休闲空间提供依据。     

The Relationship between Community and Individual Measures of Wellbeing: comparisons by remoteness for Indigenous Australians

For Aboriginal and Torres Strait Islander (Indigenous) Australians, the wellbeing of the community in which one lives and/or has an ongoing attachment to is an important aspect of individual health and wellbeing. In non-Indigenous policy discourse, the main way to summarise community-level wellbeing is through indices of socioeconomic outcomes that can be used to rank regions or areas within regions. While these have been produced for the Indigenous population, they only capture one particular aspect of community wellbeing. The analysis presented in this paper extends our knowledge of place-based community wellbeing by looking at the presence or absence of particular facilities, barriers to accessing services, and neighbourhood or community problems. Indigenous Australians in remote areas were less likely to report the presence of a number of facilities and more likely to report barriers to accessing government services. However, there were no consistent differences in the reporting of neighbourhood and community problems—some types of problems had a higher incidence in non-remote areas (e.g. theft and dangerous or noisy driving), whilst other problems were higher in remote areas (alcohol, illegal drugs and violence). Indices of these variables were also found to be associated with individual emotional wellbeing, providing prima facie evidence of the link between community and individual measures.     

基于两步移动搜寻法的城市居家养老服务设施可达性研究——以大连市沙河口区低龄老年人为例

基于Arc GIS的两步移动搜寻法可以解决设施(供给)与人口(需求)的空间分布差异性及两者可跨越区界的潜在相互作用。通过对大连市沙河口区常住居家低龄老年人与养老服务设施空间可达性进行实证研究,利用两步移动搜寻法获取各服务设施到人口聚居点的可达性数值并利用Map Info绘制成图,得出89个社区供需间潜在的空间可达性呈现优秀、良好、一般和较差4种结果,为大连沙河口区针对低龄老年人居家养老服务设施的发展规划提供辅助决策支持,也展现了两步移动搜寻法在公共服务空间可达性评价方面的作用。