最大值函数对建筑物沉降的回归分析     

乔月 《现代测绘》2008,31(4)

为有效地对建筑物的沉降进行回归分析,本文以新城花园酒店为例,用幂级数和最大值函数两种回归函数对观测数据进行分析,通过显著性检验值和均方差的大小来推测建筑沉降的规律,并根据分析预测结果来评价两种回归函数的性能,理论分析和实验表明:采用最大值函数和幂级数对LS5的观测数据进行回归分析都能够达到建筑物沉降变形的精度要求,但最大值函数的性能优于幂级数。  相似文献   

Knowledge makes the money go round: Conflicts of interest and corporate finance in London’s financial district     

Sarah Hall 《Geoforum》2007,38(4):710-719

This paper argues that the conflicts of interest cases brought against Wall Street investment banks in the early 2000s were neither geographically nor institutionally isolated events. Rather, by combining recent work on financial knowledges in both economic geography and the social studies of finance with the growing interest in topological spatial imaginaries, I explore how London’s corporate finance industry was unable to distance itself from both the conflicts of interest allegations and the ensuing regulatory changes of the ‘Global Settlement’ in the US. Analysis of 36 semi-structured interviews conducted in London in the early 2000s is used to explore how a range of individual interests, institutional demands and structural changes within London’s financial district affected analysts’ ability to produce ‘objective’ research. As well as pointing to the problematic nature of certain aspects of knowledge rich ‘communities of practice’ [Wenger, E., 1998. Communities of practice: learning, meaning and identity. Cambridge University Press, Cambridge], I explore how the resulting contingent and situated nature of research practice is at odds with a weakly defined notion of ‘objective’ research that underpins the Financial Services Authority’s regulatory response.  相似文献   

鄂尔多斯盆地二叠系下统太原组沉降差异特征分析     

刁雨薇 《地下水》2015,(1):188-190

为了研究鄂尔多斯盆地二叠系下统太原组的沉降差异特征,统计出盆地内各井太原组在晚二叠纪、晚三叠纪、早侏罗纪、中侏罗纪、早白垩纪以及现今的上覆岩层厚度,编绘出太原组在该沉积期沉降差异图。根据所绘的沉降差异图,分析得出鄂尔多斯盆地在二叠系至中侏罗系盆地沉降特征相似,其大体是南低北高,西低东高的趋势,且随时间推移沉积深度不断增加,而至白垩纪沉积时,盆地沉降中心略向西偏移,盆地中部较低,向四周逐渐升高,而盆地北部较东部高。而已发现气藏的位置与太原组在不同地质时期的沉降中心位置有一定的关系。  相似文献   

空间信息技术在农业保险中的应用研究     

郭清  何飞 《测绘软科学研究》2014,(1):79-84

中国是农业灾害发生频繁且灾情严重的国家之一。农业保险已成为农民灾后恢复生产和灾区重建的重要资金来源,风险保障和经济补偿作用日益凸显。但是,农业保险面临着信息不对称和经营成本高等问题。而利用3S等空间信息技术,可将保险标的空间化,建立承保标的空间数据库,为承保和理赔工作提供空间数据和分析管理支持,实现＂按图承保＂和＂按图理赔＂,以空间信息技术支持的农业保险创新应用促进了农业保险模式的转变,从而有效地解决农业保险存在的信息不对称和经营成本高等问题,充分发挥农业保险支农惠农的社会管理职能,提升农业保险的风险管理水平,以更好地服务＂三农＂。  相似文献   

高层建筑物沉降监测数据分析     

朱治国  方伟  刘代芹  帕尔哈提·再努拉 《内陆地震》2011,(4):360-365

通过对高层建筑物的沉降进行跟踪观测,获得建筑物沉降的准确数据.分析地基在不同荷载作用下随时间沉降的规律,为高层建筑物施工和运营安全提供数据保证.通过对建筑物野外观察及沉降数据讨论,分析建筑物沉降原因.  相似文献   

Prediction of long-term settlement on soft clay using shear wave velocity and damping characteristics     

Mohamad Nor Omar  Colin Peter Abbiss  Mohd. Raihan Taha  Khairul Anuar Mohd. Nayan 《Engineering Geology》2011,(4):259

This paper presents a method of calculating long-term settlement of a loaded pad on soft clay at Klang, Selangor, Malaysia where the soil model is treated as an anelastic material of viscoelastic property. Initially, an elastic shear modulus (G) value from shear wave velocity profiles of the seismic tests from spectral analysis of surface wave (SASW) and continuous surface wave (CSW) tests was obtained. A value of damping (D) at an equivalent elastic strain is then calculated from the hysteresis of the plate load tests corrected to equivalent strain using the Damping–Strain formula. The calculated elastic settlement and its equivalent damping are then used to calculate the long-term settlement by applying the generalised viscoelastic formula. Comparisons to traditional methods of settlement predictions were made and the viscoelastic formula has shown better agreement to the observed settlement. Further modification of the settlement formula is introduced to improve the settlement accuracy to 10%.  相似文献   

隧道下穿既有结构物引起的地表沉降控制标准研究     

陈星欣  白冰 《工程地质学报》2011,19(1):103-108

解决好隧道下穿既有结构物引起的地表沉降问题,对城市地下交通和高速铁路的建设具有重要的意义.在调研国内大量隧道下穿开挖引起的地表沉降控制标准和方法的基础上,根据隧道下穿公路、铁路、隧道和建筑物时引起的地表沉降的不同特点,结合隧道的施工、开挖面积、埋深和工程地质条件等因素,对隧道下穿不同的结构物提出不同的控制沉降措施和建议...  相似文献   

基于饱和曲线法的地基沉降全过程预测     

方薇  陈向阳 《工程地质学报》2014,22(6):1066-1070

针对S形沉降时程特征,提出了饱和曲线预测模型。首先,证明了该模型与S形沉降曲线的特点是相吻合的,包括有界性、单调递增性、存在反弯点,同时考察了模型中各参数改变对结果的影响; 其次,阐述了待定参数的获取方法和沉降预测步骤; 最后,通过多个工程实例对沉降预测模型的合理性进行了研究。算例表明,饱和曲线预测模型可以有效地用于加载全过程的沉降预测,具有适应性较广、精度较高、稳定性好的特点。与双曲线法、指数曲线法、星野法、生长曲线法相比而言,本文提出的沉降预测模型可靠性较高,具有一定的工程价值和应用前景。  相似文献   

A multiple profile approach to the palynological reconstruction of Norse landscapes in Greenland's Eastern Settlement     

Paul M. Ledger  Kevin J. Edwards  J. Edward Schofield 《Quaternary Research》2014

Palynological research is increasingly revealing the landscape impacts of Norse colonisation in southern Greenland. Typically, although not exclusively, these studies are from depositional environments with highly localised pollen source areas close to fjord-side centres of medieval power. In contrast, this paper presents data from Vatnahverfi, an inland district of the Eastern Settlement, and explores the emergence of a cultural landscape through three pollen sequences at variable distances from Norse farms. Two are from mires with small pollen source areas close to (< 100 m) and distant from (≥ 1500 m) probable farming activities. The other provides a more regional signal of vegetation change, albeit one located close to a Norse settlement. Landnám is marked primarily through an increase in microscopic charcoal and the appearance of pollen from Rumex acetosella, although significant differences between profiles are noted. Close to Norse ruins, pollen productivity from grassland communities increases and woodland and scrub representation declines. Further from archaeological remains, palynologically inferred human activity is primarily characterised by decreased productivity, notably declining influx from woodland and scrub species, reflecting grazing herbivores or coppicing. Abandonment of Vatnahverfi is indicated from the late 14th to early 15th century AD.  相似文献   

海月水母水螅体附着选择性研究   总被引：2，自引：1，他引：1  

王彦涛  孙松  李超伦 《海洋与湖沼》2012,43(6):1091-1095

通过室内实验研究了海月水母(Aurelia sp.1)浮浪幼虫在活体牡蛎、牡蛎壳、扇贝壳、波纹板、网衣(200μm)、PV管等材料上的附着选择性和水螅体在竹竿和水泥块上的增殖问题。实验表明,浮浪幼虫对人工材料(波纹板、网衣、PV管)具有偏好性,附着密度较大;水平放置的附着材料底部附着更多的水螅体。水螅体可以通过无性繁殖方式在新的栖息地形成水螅体种群,种群扩张过程中存在密度限制,较低密度时水螅体种群增长较快,高密度时水螅体种群增长较慢。作者认为,日益增加的海洋废弃物(塑料、玻璃、木材),以及海底构造物(海水养殖筏、海洋工程)为水螅体提供了更多的附着表面,这有利于水螅体栖息地的扩张,形成更大的水螅体种群。  相似文献