首都地质资源环境承载能力监测预警信息平台建设思路     

韩征  郭萌  秦俊生  李潇  李佳  刘钊  李敏 《城市地质》2017,12(2)

为适应大数据的新背景和首都未来发展形势的新需求,同时避免"信息孤岛"、"重复建设"等现象的发生。本次以首都地质资源环境承载能力监测预警平台为例,提出以多维地理信息系统、智慧地图、互联网大数据分析等信息化技术为基础的平台建设思路,阐述了平台的总体架构及云计算技术,多源异构空间数据集成技术,大数据存储处理技术等关键技术问题,同时对平台将实现的功能应用和服务对象进行了分析和说明。  相似文献   

烟台市1∶500地形数据整合方法初探          下载免费PDF全文

邹敏 《山东国土资源》2017,33(9):72-76

为从源头彻底摆脱传统测绘生产过程中图属分离、图库分离的弊端,该文以烟台市1∶500地形数据整合为例,统筹现有地图制图规范与G1S建库需求,在统一制定数据标准的基础上,基于EPS2008软件,提出了一套制图与建库一体化数据整合技术流程,较好地解决了地图与空间数据相互表达的问题,实现了制图与建库的一体化管理。该方法还大大降低了数据重复处理的劳动强度,提高了数据整合转换的准确性和合理性,减少了信息丢失。  相似文献   

Effect of drying environment on engineering properties of an expansive soil and its microstructure   总被引：1，自引：0，他引：1  

Ling-wei Kong  Min Wang  Ai-guo Guo  Yong Wang 《山地科学学报》2017,14(6):1194-1201

This paper investigates the effect of drying environment, i.e. temperature and relative humidity, on the engineering properties and microscopic pore size distribution of an expansive soil. The shrinkage tests under different drying temperatures and relative humidity are carried out in a constant climate chamber. Then, the undisturbed samples, prepared in different drying environment, are used for the triaxial tests and mercury intrusion tests. It is found that the drying environment has noticeable influence on the engineering properties of expansive soils and it can be characterized by the drying rate. The linear shrinkage and strength increase with the decrease of the drying rate. The non-uniform deformation tends to happen in the high drying rate, which subsequently furthers the development of cracks. In addition, during the drying process, the variation of pores mainly focuses on the inter-aggregate pores and inter-particle pores. The lower drying rate leads to larger variation of pore size distribution.  相似文献   

Semi‐active tuned mass damper building systems: Application     

Min‐Ho Chey  J. Geoffrey Chase  John B. Mander  Athol J. Carr 《地震工程与结构动力学》2010,39(1):69-89

Seismic performance attributes of multi‐story passive and semi‐active tuned mass damper (PTMD and SATMD) building systems are investigated for 12‐story moment resisting frames modeled as ‘10+2’ stories and ‘8+4’ stories. Segmented upper portion of the stories are isolated as a tuned mass, and a passive viscous damper or semi‐active resetable device is adopted as energy dissipation strategy. The semi‐active approach uses feedback control to alter or manipulate the reaction forces, effectively re‐tuning the system depending on the structural response. Optimum tuned mass damper control parameters and appropriate matching SATMD configurations are adopted from a companion study on a simplified two‐degree‐of‐freedom system. Statistical performance metrics are presented for 30 probabilistically scaled earthquake records from the SAC project. Time history analyses are used to compute response reduction factors across a wide range of seismic hazard intensities. Results show that large SATMD systems can effectively manage seismic response for multi‐degree‐of freedom systems across a broad range of ground motions in comparison to passive solutions. Specific results include the identification of differences in the mechanisms by which SATMD and PTMD systems remove energy, based on the differences in the devices used. Additionally, variability is seen to be tighter for the SATMD systems across the suites of ground motions used, indicating a more robust control system. While the overall efficacy of the concept is shown the major issues, such as isolation layer displacement, are discussed in detail not available in simplified spectral analyses, providing further insight into the dynamics of these issues for these systems. Copyright © 2009 John Wiley & Sons, Ltd.  相似文献   

Micro‐geomorphology determines community structure of biological soil crusts at small scales     

Xin‐Rong Li  Min‐Zhu He  Stefan Zerbe  Xiao‐Jun Li  Li‐Chao Liu 《地球表面变化过程与地形》2010,35(8):932-940

Biological soil crusts (BSCs) are ubiquitous communities of diminutive organisms such as cyanobacteria, green algae, lichens, mosses and others associated closely with particles of surface soil, forming a cohesive thin horizontal layer. The ecological roles of BSCs affecting soil nutrient cycling, stability and hydrological processes, influencing the germination and establishment of vascular plants, and serving as habitats for numerous arthropods and microorganism have been well documented. We tested the hypothesis that micro‐geomorphological features determine the spatial distribution of BSCs by reallocating related abiotic resources at small‐ and medium‐scales in the Tengger Desert. Our results showed that higher soil pH and higher total potassium content in topsoil positively correlated with the colonization of cyanobacteria and algae in the earliest successional stages of BSCs, while increasing dust deposition onto the topsoil enhanced the development of lichen and mosses in the later stages of BSCs. Increasing soil moisture raised the proportion of mosses and lichen in BSCs, this will possibly change the ecological functions of BSCs, such as nitrogen‐fixation by cyanobacteria, due to the conversion from a complex to relative simple type of BSC. Micro‐geomorphology has created various habitats at a small‐scale affecting colonization and development of cryptogams. This paper considers the contribution of micro‐geomorphology to biodiversity in the extreme arid desert systems. Copyright © 2010 John Wiley & Sons, Ltd.  相似文献   

构造应力场三维数值模拟的有限单元法     

田宜平  刘雄  李星  魏民 《地球科学》2011,36(2):375-380

目前构造应力场的研究主要是基于平面的二维分析,随着油气成藏过程三维模拟的发展,应力场的三维数值模拟显得越来越重要.从三维空间角度出发,分析了应力场的有限元模拟与求解的整个过程.基于不规则六面体单元的角点网格数据模型,对有限元求解法进行了分析与研究并提出计算方法.基于不规则角点网格数据模型的三维构造应力场有限元计算方法是本文的创新点.最后用上述方法对东营凹陷的牛庄-王家岗区域三维应力场进行了实际模拟计算,计算结果相比于其他数据模型更符合实际情况.   相似文献   

樟子松固沙林带间植被恢复及其对林草界面作用的响应   总被引：1，自引：0，他引：1  

姜丽娜  杨文斌  姚云峰  卢琦  杜敏  王琳琳 《中国沙漠》2011,31(2):372-378

调查了海拉尔市巴音岱林场不同分布格局、不同带间距的人工樟子松林带内植被恢复过程及物种多样性的差异,分析了林草界面生态学效应,研究了林草界面对带间植被自然恢复的作用。结果表明,宽的带间距带内物种多样性和生物量变化曲线出现了两个高峰,而窄的带间距带内只有一个高峰,说明该地区林带之间距离不应小于12 m;当林带之间距离为16~28 m时草本物种多样性出现最大值。植被恢复效果表现为带间距12 m差于带间距24 m,虽然都差于天然植被,但边际效应大大地加速了群落演替的进程。研究区樟子松林草界面边缘效应影响域为20 m, 其小尺度范围内生境异质性也很明显。行带式造林带间距离不应大于40 m,超出边缘效应影响域不利于带间植被恢复。  相似文献   

Improved-GRACE����������������Ż��о�   总被引：12，自引：3，他引：9  

郑伟  许厚泽  钟敏  员美娟  彭碧波  周旭华 《大地测量与地球动力学》2010,30(2):43-48

???????????????????ü????????????????GPS????????λ????????????????????????????????????????????????????????????????Improved??GRACE?????????????????????????????????????????????1????300?????????350 km???????????????????????3.993??10 ^-1 m??????300 km??250 km???????????????????8.770????77.145????????400 km??450 km??????????????????8.718????75.307????2??????50 km???????????????????????3.993??10^-1 m??????110 km??220 km??????????????????1.259????1.395????3????????????Improved??GRACE????????????????????????????????350 km??50 km?????  相似文献   

矢量地图空间信息度量及其变化分析方法   总被引：1，自引：0，他引：1  

陈杰  邓敏  陈晓勇  孙金礼  潘智虎 《地理信息世界》2010,8(1):78-83

如何计算地图的空间信息含量是评价制图质量、地图综合算法以及实现空间信息有效传输的重要基础。论文在详细分析现有的空间信息度量方法的基础上,提出了一种空间信息度量的新方法。该方法分别从几何、专题、拓扑以及专题拓扑4个方面来度量地图空间信息。然后,提出利用膨胀和序贯膨胀形态学算子分析几何信息熵、专题信息熵、拓扑信息熵以及专题拓扑信息熵随地图符号影响范围不同而引起的变化。通过算例分析发现,利用Voronoi图计算得到的结果是论文方法的一个极值结果(即特例),并且该方法便于定量分析地图空间信息熵度量随符号影响范围(或大小)的变化情况。  相似文献   

Corrosion behavior of anodic oxidized TiO<Subscript>2</Subscript> film in seawater     

Min Wang  Wei Wang  Benlin He  Mingliang Sun  Yansheng Yin  Lan Liu  Wuyuan Zou  Xuefei Xu 《中国海洋大学学报(英文版)》2010,9(4):376-380

TiO₂ films were formed on metallic titanium substrates by the anodic oxidation method in H₂SO₄ solution under the 80V D.C.. Phase component and microstructure were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). Water contact angles on titanium oxide film surface were measured under both dark and sunlight illumination conditions. Corrosion tests were carried out in seawater under different illumination conditions by electrochemistry impedance spectrum (EIS) and polarization curves. The result showed that the TiO₂ film prepared by the anodic oxidation method was anatase with a uniform structure and without obvious pores or cracks on its surface. The average water contact angle of the film was 116.4° in dark, in contrast to an angle of 42.7° under the UV illumination for 2 hours, which demonstrates good hydrophobic property. The anti-corrosion behavior of the TiO₂ film was declining with the extended immersion time. Under dark conditions, however, the hydrophobic TiO₂ film retarded the water infiltrating into the substrate. The impedance changed slowly and the corrosion current density was 2 orders of magnitude lower than that with the film illuminated by sunlight. All of those mentioned above indicate that the TiO₂ film possesses much better performance under dark condition, and it can be applied as an engineering material under dark seawater environment.  相似文献