某铁路工程控制网复测与稳定性分析

工程控制网是一切施工测量的基准,其稳定性直接关系到施工测量和工程的整体质量。因此,必须对控制网进周期性复测,以便分析控制网的稳定性。文章利用误差理论方法对复测成果进行了分析,得出了一些有益的结论和建议。     

Water marginalization at the urban fringe: environmental justice and urban political ecology across the North–South divide

This article reconsiders the epistemic and geographic boundaries that have long separated scholarship on urban water poverty and politics in the Global North and South. We stage an encounter between the seemingly dissimilar cases of Tooleville outside of the city of Exeter in California’s Central Valley and Bommanahalli outside of Bangalore, India, to illuminate the geography of water marginalization at the fringes of urban areas, and to deepen cross-fertilization between two geographic literatures: environmental justice (EJ) and urban political ecology (UPE). We argue that there is scope for transnational learning in three arenas in particular: (1) water access, (2) state practice, and (3) political agency. In so doing, we aim to advance a genuinely post-colonial approach to theory and practice in the pressing arena of urban water politics.     

Dark side of the planet: hidden dimensions of urban agglomeration

ABSTRACT

This intervention probes the hidden, political dimensions of planetary urbanization. Drawing on political theory, it approaches its analysis through the analytic of ‘the political,’ the dimension in which antagonism performs a constitutive function in the social order. In doing so the intervention throws into relief the ways in which group-based differentiation, conflict, and exclusion establish the conditions of possibility for ongoing transformations of urban agglomeration. It then develops a case for further exploring intersections of the political and capitalist agglomeration to generate new knowledge about current mutations in urban economies of space.     

Time,Action, Space

Postmetropolis deepens Edward Soja's engagement with the sociospatial dialectic, one of his major contributions to urban theory. It also represents an uncharacteristic foray into history. The objectives of my contribution are to probe his treatment of time and to extend his sociospatial dialectic into the realm of actor-network theory, thereby further situating the materiality of the city at the theoretical center of social thought.     

组合法精化胶州市大地水准面

本文利用全球重力位模型、胶州市地面重力观测数据、胶州市GPS水准数据和数字地面模型(DTM),采用组合法应用移去-恢复技术计算剩余大地水准面,并与地球位模型计算的高程异常进行拟合,得到该地区重力似大地水准面,再和布测、计算得到的GPS/水准所构成的几何大地水准面拟合,利用多项式拟合完成系统改正,获得最终的大地水准面结果及相关的精度信息。     

A novel hybrid approach of Bayesian Logistic Regression and its ensembles for landslide susceptibility assessment

Abstract

A novel artificial intelligence approach of Bayesian Logistic Regression (BLR) and its ensembles [Random Subspace (RS), Adaboost (AB), Multiboost (MB) and Bagging] was introduced for landslide susceptibility mapping in a part of Kamyaran city in Kurdistan Province, Iran. A spatial database was generated which includes a total of 60 landslide locations and a set of conditioning factors tested by the Information Gain Ratio technique. Performance of these models was evaluated using the area under the ROC curve (AUROC) and statistical index-based methods. Results showed that the hybrid ensemble models could significantly improve the performance of the base classifier of BLR (AUROC?=?0.930). However, RS model (AUROC?=?0.975) had the highest performance in comparison to other landslide ensemble models, followed by Bagging (AUROC?=?0.972), MB (AUROC?=?0.970) and AB (AUROC?=?0.957) models, respectively.     

A New Formation Mechanism of Coesite without the Plate Deeply-Subduction and Fast-Exhumation——Comment on the Article “Discussion on Some Problems of Quartz-Coesite Phase Transition”

本文分析评论了嵇少丞等(2010)发表的“石英—柯石英相变研究中若干问题讨论”一文.指出他们对柯石英非俯冲折返新机制的一些误解,对某些热力学、物理学概念,及其在地学问题中的解释理解的不同.分析了机械球磨的作用机制;论证了机械球磨作用本质与构造挤压剪切作用本质的同一性.分析了岩石糜棱岩化过程的两个阶段;讨论了地震波形成柯石英机制的可能性.围绕比较标准问题,论证了高能机械球磨(预处理)能大大降低α-石英转变成柯石英的压力、温度和合成时间,促进柯石英的形成.用小尺度不均匀局域高压微区模型解释了人工合成柯石英的规律性、南极洲天然矿物的行为,柯石英的寄生矿物、岩石——锆石、榴辉岩包裹体、非包裹体的形成.列举事例澄清了“球磨引进的Fe杂质提高柯石英形成压力迟缓合成”的说法;讨论了第二相存在对石英—柯石英转变的影响和“应变禁区”边界区的应力梯度相变驱动力可以形成柯石英问题.指出了机械球磨石英原料预处理和静高压合成柯石英后处理两步法,是一种实验室研究柯石英形成规律的有效物理方法;小尺度不均匀局域高压微区模型和无需板块深俯冲快折返的柯石英形成机制,是一种有希望的柯石英形成新机制.     

一种非板块深俯冲快折返的柯石英形成新机制——评析“石英—柯石英相变研究中若干问题讨论”一文

本文分析评论了嵇少丞等(2010)发表的"石英—柯石英相变研究中若干问题讨论"一文。指出他们对柯石英非俯冲折返新机制的一些误解,对某些热力学、物理学概念,及其在地学问题中的解释理解的不同。分析了机械球磨的作用机制;论证了机械球磨作用本质与构造挤压剪切作用本质的同一性。分析了岩石糜棱岩化过程的两个阶段;讨论了地震波形成柯石英机制的可能性。围绕比较标准问题,论证了高能机械球磨(预处理)能大大降低α-石英转变成柯石英的压力、温度和合成时间,促进柯石英的形成。用小尺度不均匀局域高压微区模型解释了人工合成柯石英的规律性、南极洲天然矿物的行为,柯石英的寄生矿物、岩石——锆石、榴辉岩包裹体、非包裹体的形成。列举事例澄清了"球磨引进的Fe杂质提高柯石英形成压力迟缓合成"的说法;讨论了第二相存在对石英—柯石英转变的影响和"应变禁区"边界区的应力梯度相变驱动力可以形成柯石英问题。指出了机械球磨石英原料预处理和静高压合成柯石英后处理两步法,是一种实验室研究柯石英形成规律的有效物理方法;小尺度不均匀局域高压微区模型和无需板块深俯冲快折返的柯石英形成机制,是一种有希望的柯石英形成新机制。     

基于模糊理论和典型线路的地质灾害评价的GIS方法研究

根据影响区域地质灾害发生的地质因素、地形因素、诱发因素和人为因素,建立区域地质灾害评价指标体系,对典型线路穿越的评价试验区进行地质灾害区域评价.由于地质灾害数据不仅含有不确定性而且还有复杂的模糊性,因而选用模糊评价方法.本文主要通过选取典型线路,采用模糊综合评判,利用GIS来进行,该研究结果表明是科学的、合理的和客观的...     

基于力学思想的空间聚类有效性评价

从力学的角度来考虑空间聚类问题,并结合地理学基本规律提出了一种基于力学思想的空间聚类有效性评价指标(简称SCV)。实验分析表明,本文提出的评价指标能够更准确、高效地对二维地理空间数据的硬聚类结果进行有效性评价。