“十白”高速D级GPS控制网精度分析     

陈小囝  胡俊锋  王正飞  王俊超 《测绘与空间地理信息》2011,34(5):117-118,121

为了给十堰-白河高速公路提供控制测量资料及后续碎部测量资料,在高速公路沿线布设一系列D级GPS控制点,通过对GPS控制网测量以及外业数据的初步处理,实现了对GPS网的重复边检核,同步环闭合差检核和异步环闭合差检核,进而分析了GPS外业测量的精度,并为今后相似地形条件的工程提供了技术保证。  相似文献   

对加强地震政府网站地震突发事件信息保障工作的思考   总被引：1，自引：0，他引：1  

曹飒  吴敏 《国际地震动态》2011,(9):30-35

地震政府网站是地震行业面向社会宣传防震减灾工作、服务公众的重要窗口.汶川、玉树地震后,地震工作越来越受到社会的关注,地震政府网站已成为社会公众和主流媒体、网站获取地震信息的重要平台,在抗震救灾中发挥着越来越重要的作用.本文通过地震政府网站在汶川、玉树等地震突发事件中信息保障工作的实践,从网站应急制度建设、编制网站应急预...  相似文献   

基于矿业权实地核查成果数据的县(市)矿政管理一张图建设     

谭永杰  郭佳  王慧 《地理信息世界》2011,9(6):30-33

在简要分析矿业权实地核查成果数据特点的基础上,结合我国矿政管理的实际情况,提出了以单矿业权实地核查成果为基本数据源、以县为基本地域单元的矿政管理一张图建设的基本框架、工作模式和基本方法,对于推进研究成果对矿政管理一张图建设具有重要的探索意义.  相似文献   

政府网络监管与个人隐私保护   总被引：1，自引：0，他引：1  

石雁 《成都信息工程学院学报》2006,21(1):101-104

网络时代政府监管与个人隐私保护的冲突问题比以往更加突出,我国有关法律法规涉及到网络空间个人隐私权的法律保护问题,但缺少操作细则,立法应当对政府的网络监管权作出制约.在网络上实现巨大公共利益的同时,实现对个人隐私的保护.  相似文献   

试析行政的生态平衡     

盛楠 《成都信息工程学院学报》2006,21(4):604-608

行政生态平衡包括行政个体、行政团体、行政整体的平衡以及行政系统与社会环境诸要素间的平衡。如果行政系统的能量变换和物质循环处于平衡动态，系统的活动就能正常开展；否则系统活动将失调，平衡难以实现。  相似文献   

基于SuperMap GIS的乌鲁木齐市矿政管理系统建设     

张忠生  郑文鉴  马春霞  穆荣  李堃 《测绘与空间地理信息》2013,(Z1):152-154,157

以乌鲁木齐市矿政管理业务需求与特点为基础,对矿政管理业务系统进行了分析与设计,并基于Super-Map iServer平台进行构建。系统实现了矿权登记、储量管理、规费管理、地质环境、矿山年检、数据交换等业务需求。该矿政管理系统实现了一体化、集成化的业务管理,提升了乌鲁木齐市国土资源矿政业务的管理水平,对基层矿政管理系统的建设具有一定的借鉴意义。  相似文献   

The death spiral of coal in the U.S.: will changes in U.S. Policy turn the tide?     

Roman Mendelevitch  Christian Hauenstein  Franziska Holz 《Climate Policy》2013,13(10):1310-1324

ABSTRACT

The administration of U.S. President Donald Trump has promised to stop the ongoing spiralling down of the U.S. coal industry. We discuss the origins of the decline and assess the effects of policy interventions by the Trump administration. We find that, with fierce competition from natural gas and renewables, a further decrease of coal consumption must be expected by the old and inefficient U.S. coal-fired electricity generation fleet. By contrast, we consider the overly optimistic (for coal producers) view of the U.S. Energy Information Agency, and test whether the tide for the U.S. coal industry could turn as a result of three potential support measures: (i) revoking the Clean Power Plan (CPP); (ii) facilitating access to the booming Asian market; and (iii) enhanced support for Carbon Capture, Transport and Storage (CCTS) technology. We investigate the short-term and long-term effects on U.S. coal production using a comprehensive partial equilibrium model of the world steam coal market, COALMOD-World (Holz, Haftendorn, Mendelevitch, & von Hirschhausen, 2016). We find that revoking the CPP could stop the downward trend of steam coal consumption in the U.S., but even allowing for additional exports, will not lead to a return of U.S. coal production to the levels of the 2000s, that is, over 900?Mt per year. When global steam coal use is aligned with the 2°C climate target, U.S. steam coal production drops to around 100?Mt per year by 2030 and below 50?Mt by 2050, even if CCTS is available and exports via the U.S. West Coast is possible.

Key policy insights

• Declining U.S. coal use is primarily caused by competition from natural gas and renewables not by environmental regulation of the coal sector.

• Without substantial policy support, U.S. coal-fired generation capacity will continue to decline rapidly.

• Revoking the Clean Power Plan will lead to about one eighth higher U.S. coal production in the next years.

• Carbon Capture, Transport and Storage does not prevent the rapid decline of coal use required under stringent climate policy.

• Even in the most extreme pro-coal scenarios with additional export possibilities, U.S. coal production will not return to its pre-2010 levels.

  相似文献   

往复荷载下层状地基柔性筏板-群桩共同作用分析     

黄茂松  李波 《岩土力学》2012,33(8):2388-2394

提出一种层状地基中柔性筏板-群桩共同作用分析方法,探讨筏板刚度对桩筏基础沉降的影响,并成功预测了往复荷载下桩筏基础的长期沉降。筏板刚度采用Mindlin板理论的有限单元法分析;桩-土体系的刚度矩阵中,桩顶面-桩顶面、桩顶面-土表面以及土表面-土表面的相互作用分析采用层状剪切位移法借助层状地基的Burmister位移解求得。基于层状地基中柔性筏板-群桩的沉降计算方法以及往复荷载下土体压缩模量的衰减特性得到了桩筏基础的长期沉降预测方法。与已有文献方法和离心模型试验结果的对比分析表明,柔性筏板-群桩共同作用方法得到的沉降值具有较高的精度。  相似文献   

关于推进我国地震预报进步的几点建议     

陆远忠 《国际地震动态》2005,(5):81-84

本文立足于我国地震预报的实践及当前地震预报的科学水平,提出了推进我国地震预报进步的几点建议：①继续坚持并强化现行地震预报管理体制,不断改进经验性和统计预报的方法,努力作好震情监测预报工作,为防震减灾再做出一些有减灾实效的预报。②制订中国地震监测预报中长期科学发展规划,努力提高我国地震预报研究的科学水平。③探索地震动力(物理)预报的途径。④培养一流的地震预报科技人才,开展地震预报的国际合作研究。  相似文献   

Geotechnical aspects of earthquake‐induced settlement of clay layer     

Hiroshi Matsuda  Sukeo O‐Hara 《Marine Georesources & Geotechnology》2013,31(3):179-206

Abstract

It has been observed that earthquake‐induced settlement depends on the excess pore water pressure accumulated during an earthquake. In particular, in the case where a clay layer is overconsolidated, excess pore water pressure is produced and settlement occurs by dissipation of the excess pore water pressure, which is very large in comparison with the coefficient of secondary compression. Therefore, if the settlement of clay ground induced by secondary compression becomes a serious problem, careful consideration of the earthquake‐induced settlement is needed. In this article, the settlement characteristics of a clay layer induced by cyclic shear are discussed, including the effects of loading period, the threshold shear strain below which no excess pore pressure or no settlement takes place, and the relationships between uniform shear strain cycles and irregular strain‐time histories. Then a calculation procedure for estimating the earthquake‐induced settlement is developed and applied to three soil profile cases, including the clay layers in Mexico City and Osaka Bay in Japan. In the case of a soil profile in Mexico City, settlements of about 0–3 cm are estimated and these values agree reasonably with the leveling results for the Mexico City earthquake of 1985. Furthermore, it is pointed out that the settlement induced by earthquakes is considerably affected by differences in the accelerograms.  相似文献