南华县建设工程抗震设防管理探析     

李恒枝 《高原地震》2014,26(4):33-37

地震是群灾之首,地震灾害不可抗拒,只能防御,建设工程进行合理的抗震设防是震灾预防的关键环节,规范各类建设工程抗震设防管理是社会抵御地震灾害最为有效的途径.对南华县抗震设防管理现状和存在的问题进行深入分析后,提出了进一步规范抗震设防管理的对策意见.  相似文献   

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程广义  张海东  张英利  万鑫  赵淑芬 《大地测量与地球动力学》2012,32(2):96-99

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Receiver function imaging in strongly laterally heterogeneous crust: Synthetic modeling of BOLIVAR data          下载免费PDF全文

Yongbo Zhai  A. Levander 《地震科学（英文版）》2011,24(1):45-54

We resolve a large (~20 km) discrepancy in Moho depth determined from PdS receiver functions (RFs) and from active source seismic profiling in the complex Caribbean-South American plate boundary zone in eastern Venezuela. As part of the BOLIVAR experiment 20 broadband stations were deployed along an active source profile to record teleseisms. Using the extremely heterogeneous crustal model obtained from active source data, we generated 2D finite-difference elastic wave synthetics and from them calculated receiver functions and CCP stacks. We compare the observations with synthetic sections that have been spatially sampled at 0.25 km to 40 km. The densely sampled synthetics show that several events in the field data that were originally interpreted as the Moho are multiple reflections within sedimentary basins. Where the Moho has the steepest dip under the plate boundary the CCP stacks fail to image the Moho well, regardless of the density of spatial sampling. A suitable spatial sampling criterion for clearly imaging the lower crust and Moho is to overlap Fresnel zones by 50% at Moho depth, which for the 1 Hz receiver functions examined here, requires an instrument spacing of 15–20 km, with the actual field data density ranging from 20 km to 100 km.  相似文献   

龙滩水电工程地震台网设计与建设     

杨超英  姚宏 《地震地磁观测与研究》2010,31(3):95-101

龙滩水电工程在我国规模仅次于三峡水电工程。本文论述了在龙滩大坝和库区周边建设地震监测台网的作用及意义,分别介绍了龙滩数字遥测地震台网和强震动台网的设计与建设情况,以及所取得的建设成果及投资效益。  相似文献   

A Glimpse of Steel Manufacture     

《The Journal of geography》2012,111(4):169-178

Abstract

Abstract

This article explores the relationship between the values that teachers bring to the classroom and their performance. The insights are drawn from the National Science Foundation-funded Finding A Way project that was undertaken by the National Council for Geographic Education. I argue here that without understanding the values and beliefs of classroom teachers, professional development initiatives might, in the end, make little difference in what goes on in the classroom.  相似文献   

The effects of land consolidation on the ecological connectivity based on ecosystem service value: A case study of Da’an land consolidation project in Jilin province     

Jun WANG  Shenchun YAN  Yiqiang GUO  Junran LI  Guoqing SUN 《地理学报(英文版)》2015,25(5):603-616

Land consolidation has a profound impact on landscape patterns and ecological functions at various scales through engineering and biological measures. In recent years, China invests more than 100 billion RMB yuan on land consolidation each year. To understand how land consolidation affects landscape patterns and ecosystems, we investigated the ecosystem service value and the ecological connectivity in a consolidated area of Da’an city from 2008 to 2014 using a revised ecological connectivity index. The results indicated that land consolidation has certain negative influences on the ecosystem services in this area. The total ecosystem service value will decrease by nearly 30% in the late stage of consolidation. This decrease is caused by the loss of ecosystem service of the wetland and grassland, despite a sensible increase of cultivated land. In addition, land consolidation could change the ecological connectivity as well as the land use structure. Up to 85% of the entire area will be in low connectivity in the late stage of consolidation, representing a 6.23% increase in the total coverage compared to pre-consolidation. Finally, the different connectivity landscape and their key areas can be identified by the revised ecological connectivity index effectively. This study is helpful to trace out the relationships between landscape pattern and ecological process, and provides insights for ecological planning and designing of land consolidation in this area. We suggest that more attentions should be paid to improve the quality and ecosystem service value per unit area of the landscape, to establish ecological compensation mechanism of wetland losses, and to create the ecological corridors along the least accumulated impendence surface in the key areas during land consolidation.  相似文献   

复合土钉墙在市区深基坑支护工程中的应用          下载免费PDF全文

刘文峰  陈之伟  苏白济 《探矿工程》2017,44(3):73-76

以济南市区深基坑支护工程实例为背景,分析了在周边环境复杂,使用土地范围受限情况下的市区开展深基坑支护工程,采用复合土钉墙支护技术,利用其形式多样、组合灵活的特点,充分发挥组合中各部件的优点,取长聚优,在保证安全的前提下以期达到技术经济的最佳;同时总结了施工中各个工序的施工要点和关键技术措施。监测数据显示基坑位移变形小,未对周边环境造成不良影响,说明支护体系发挥了良好的实施效果。  相似文献   

天津海域围填海工程对渤海湾水交换的影响研究   总被引：1，自引：0，他引：1       下载免费PDF全文

靳玉丹  张秋丰  李希彬  王鲁宁  叶风娟 《海洋通报》2017,36(5):578-584

利用三维海洋数值模型FVCOM,进行渤海湾三维水动力和水交换数值模拟,经实测潮汐和潮流资料验证,模型模拟结果较好。然后采用该模型对渤海湾内的水体水交换能力进行定量研究。研究结果表明,在天津海域进行围填海工程之前渤海湾水体的半交换周期为300 d左右,围填海之后,水体半交换周期延长25 d,渤海湾西部水体的水交换率下降可达10%,半交换周期延长92 d。尤其是天津沿海南部海域的水交换能力下降严重,围填海之后其水体半交换周期延长可达200 d。渤海湾北部也有部分海域水交换周期延长达200 d。建议在进行围填海工程建设时,应将工程对水体交换能力的影响纳入考虑,避免因围填海工程因素造成的恶劣环境影响。  相似文献   

沙漠型旅游区体验项目承载力研究——以宁夏沙坡头景区为例   总被引：1，自引：1，他引：0  

李陇堂  石磊  杨莲莲  张冠乐  王艳茹 《中国沙漠》2017,37(5):1041-1049

沙漠型旅游区依藉独具特色的自然景观资源而开发出的丰富多彩的体验项目已成为沙漠旅游最大的亮点和核心吸引物。但随着游客的快速增加,沙漠生态环境、游憩设施等受到较大冲击甚至突破容量极限,从而导致游客体验质量下降,影响到沙漠旅游的可持续发展。鉴于此,以宁夏典型沙漠型景区沙坡头为例,以最受游客欢迎的滑沙、黄河飞索、皮筏漂流、沙海冲浪和骆驼骑行等5类体验项目为研究对象,分别从资源本体及游客体验感知角度对承载力进行评估。结果表明：（1）各类项目实际游客接待量已接近或超过设施承载力上限,远高于游客体验最佳时的承载力水平;（2）限制不同类型项目承载力的关键因子有所差异;（3）游客体验承载力往往低于项目设施承载力水平。根据测评结果找出每类项目承载力的关键限制因子,并基于现有游客量预测了部分项目的可扩展承载力。  相似文献   

业务协同视角下基于GIS的“五规融合”平台   总被引：2，自引：1，他引：1  

陈真  王萌  张栋梁 《测绘通报》2017,(7):124-128

以建立统一空间规划体系为目标,近年来全国各地相继开展了多规融合探索。要从根本上解决多规融合问题,核心是要解决多规涉及部门间的业务协同。本文基于业务协同研究,结合珠海市实际,探索提出了“五规融合”数据共享、规划编制协同、项目策划生成等业务协同机制,并以GIS技术为基础,对“五规融合”平台建设的设计思路与功能实现进行了探讨。  相似文献