基于空间聚类分析的杭州市生产性服务业集聚区分布特征研究

运用空间数据挖掘技术中的空间聚类分析法,以商务办公楼宇为空间对象,以其地理位置为空间数据、建筑面积为属性数据进行空间聚类计算,对杭州市中心城区生产性服务业集聚区进行划分和判定.以这些集聚区为基本空间分析单元,杭州市生产性服务业的整体空间发展表现出向心集聚的特征,并且向集聚区集中的态势不断强化,生产性服务业集聚区的规模构成、功能特征与空间分布之间存在着某种关联性.分析结果表明,生产性服务业集聚区所在的或邻近的地域所承担的城市功能等级越高,集聚区的规模越大;生产性服务业集聚区的产业功能不同,空间区位分布也会不同,并在一定程度上受到地方劳动力市场空间分布的影响.在生产性服务业空间集聚发展过程中,产业自身发展与城市空间开发之间产生的矛盾,导致了生产性服务业总体上仍处于相对分散的布局,建议在空间开发模式、区位选址以及开发容量三个方面进行合理的规划引导.     

多元统计方法在井中激电异常解释中的应用效果

文章对钻孔岩性、矿化特征进行量化,应用了背景统计、聚类分析、因子分析方法,运用多元统计分析原理,结合井中激电多参数与地质信息,使异常解释更合理.在安徽省某铜钼矿井中激电勘查中,对井旁矿体引起的异常进行了合理解释.该方法的成功应用,为物探异常的解释提供了一个新的思路.     

南京南站站房地下工程防水施工技术

南京南站站房地下防水工程采用了混凝土结构自防水与防水卷材相结合的防水设防。本文介绍了该工程所选用的聚乙烯丙纶防水卷材、SBS改性沥青防水卷材的施工工艺,以及桩头采用水泥基渗透结晶型防水涂料进行防水处理的施工工艺,对细部节点部位的防水加强处理进行了重点阐述。     

船舶工业遗产保护及创意产业集聚区创建研究

从工业遗址与创意产业的发展趋势出发,分析船舶工业遗址与其他工业遗址的共性形式和个性形式。通过总结其特征,结合开发案例,以船舶工业遗址保护与创意产业集聚区的创建为切入点,提出项目定位、建构筑物改造、文化景观、空间组织4方面创建策略,为船舶工业遗址的保护开发拓展新的思路。     

长大隧道独头通风排烟设计

结合工程概况,从通风排烟的设计原则、通风排烟的布置形式、通风机的造型等方面介绍了长大隧道独头通风排烟设计和管理应注意的问题,并对工作面的风量及通风机全压进行了具体计算,从而保证了长大隧道施工人员的身心健康。     

健康住宅节能建筑——沈阳"河畔新城"设计

沈阳河畔新城项目的开发建设围绕健康、节能两大主题,采取了一系列的技术措施和管理办法,一方面,提供自然和谐、健康环保、舒适安全的居住环境,让广大居民充分享有生理的和心理的、社会的和人文的、近期的和长期的广泛意义的健康;另一方面,严寒地区建筑的低耗节能技术也是一直在积极探索的问题,在提供健康的住宅的同时降低居住成本。     

长三角城市群近代工业化进程研究

探索了近代长三角城市群工业化进程中内部空间组织特征、演变趋势和发展模式。在研究方法上以近代工业遗产建筑元素传播为视角,通过文化因素分析法对长三角地区近代工业建筑遗产进行解构,研究该元素出现的来龙去脉以及在长三角地区不同城市工业建筑中的演变过程,以辅助证明长三角城市群近代工业发展模式。经分析得出,长三角地区近代工业的发展形成了以上海、南京为核心城市,无锡、南通、宁波等为二级城市,嘉兴、常州等为三级城市的逐级辐射圈。各城市原有基础、开埠的外力入侵、交通网络以及建造者是区域发展的主要动力因素。     

Quantification and visualization of anisotropy in trabecular bone

A number of methods for measuring anisotropy in trabecular bone using high‐resolution X‐ray computed tomography exist, which give different answers but have not been compared in detail. In this study, we examine the mean‐intercept length (MIL), star volume distribution (SVD) and star length distribution (SLD) methods, their algorithmic implementation for three‐dimensional (3D) data, and how their results relate to each other. A uniform ordered sampling scheme for determining which orientations to sample during analysis enhances the reproducibility of anisotropy and principal component direction determinations, with no evident introduction of biasing. This scheme also facilitates the creation of a 3D rose diagram that can be used to gain additional insights from the data. The directed secant algorithm that is frequently used for traversing pixel and voxel grids for these calculations is prone to bias unless a previously unreported normalization is used. This normalization ameliorates the bias present when using cubic voxels, and also permits calculations on data sets in which the slice spacing is not equal to the pixel spacing. Overall, the three methods for quantification of anisotropy give broadly similar results, but there are systematic divergences that can be traced to their differences in data and processing, and which may impact on their relative utility in estimating mechanical properties. Although discussed in the context of computed tomography of trabecular bone, the methods described here may be applied to any 3D data set from which fabric information is desired.     

HSK薄壁液压刀夹头夹紧扭矩的数值模拟

采用有限元法计算了HSK薄壁液压刀夹头承受均匀油压时的弹性变形量 ,预测了产生临界夹紧力的油压值和消除最大间隙量时产生的最小夹紧扭矩 ,预测结果与进口HSK薄壁液压刀夹头的设计值基本一致     

A Comparative Study on the Three-Dimensional Surface Topography for the Polished Surface of Femoral Head

Several surface topographic techniques have been widely used in many manufacturing engineering fields for studying the surface characteristics for the practical application of manufacturing surfaces. In this paper, a polished surface of a femoral head is considered for the compatative study, where the stylusbased technique, the autofocused optical measurement technique, the interferometric technique, and scanning probe microscopy are applied. After the operational principles are introduced, some practical comparative measurements are reported for the polished surface. Some useful comparisons and conclusions are drawn from the comparative study. General guidelines for the 3D surface topography are also given for practical application.