共查询到20条相似文献，搜索用时 10 毫秒
1.
1 抗震减灾日和地震博物馆、地震地质公园建设目的抗震减灾日和地震博物馆、地震地质公园的建设应具有鲜明特色.减灾日和博物馆、公园建设的主要目的不仅是普及地震科学知识,也不同于地震纪念馆,仅仅是纪念地震遇难同胞和颂扬抗震救灾的英雄事迹,而应全方位展示地震与人类生存发展的关系. 相似文献
2.
本文从地震监测、科研、预报、抗震、救灾、政府和社会减灾活动、减灾宣传教育和国际交流合作8个方面系统阐述中国减轻地震灾害研究的进展和实施情况,提出了相应的减灾对策. 相似文献
3.
美国联邦应急事务管理总署(FEMA)、美国国家标准与技术研究院(NIST)、美国国家科学基金会(NSF)和美国地质调查局(USGS)等4个机构于1977年首次启动了美国国家地震减灾计划(NEHRP),旨在提高全社会的抗震减灾意识,减少地震风险,降低地震损失.作为NEHRP计划之一的核心机构,USGS近期发布了新地震灾害计划(EHP),为2013年的地震减灾活动提供一个简明、现实和可操作的战略规划.本文就计划中的研究重点与战略优先领域内容做一简要介绍. 相似文献
4.
5.
抗震韧性设计的理念代表着当前结构抗震和城市防灾减灾领域的前沿方向,城市和建筑抗震韧性研究作为城市韧性研究的基础和减轻城市地震灾害的重要措施而备受关注,已成为国际地震工程领域和城市规划领域研究的热点问题之一.由于城市系统的复杂性和地震发生的不确定性,这一领域的若干科学问题还尚不明晰,亟待深入的研究和探索.文中总结和评述了... 相似文献
6.
提出了Fe/Zn双金属抗震减灾复合材料的设计构想和复合理论基础。为验证Fe/Zn双金属复合材料具有抗震减灾作用,利用有限元软件ANSYS对材料的性能作数值仿真,分析了Fe/Zn复合材料试件在地震荷载下的动力特性。复合材料中,Fe保证构件刚度、恢复力及不发生过大变形;Zn的塑性变形改变材料的自振周期,同时吸收地震能量。 相似文献
7.
8.
9.
《崇搬图》一书为纳西族东巴文经典著作之一。文章评述了该书有关地球物理减灾科学部分,内容包括;人类早期的地球观、地震和洪水灾害、抗震减灾以及重建家园． 相似文献
10.
对新疆乌恰6．8地震中新疆强震台网记录的加速度数据进行了常规处理分析,介绍了如何使用近场强震观测资料研究地面运动特征,并简介了强震观测资料在抗震工程设计和抗震减灾中的作用。 相似文献
11.
12.
基于VTK的医学图像系统研究 总被引：6，自引：0，他引：6
医学三维数据场可视化是当前科学计算可视化应用的重点。本文论述了可视化工具包VisualizationToolkit(VTK)的主要特点,介绍了三维医学可视化系统实现的原理和方法。根据一系列人体断面图像,应用VTK实现了三维医学图像重构,对重构后的三维图像进行解剖分析;并实现对人体的二维图像逐帧浏览及柱状统计。实验结果表明,VTK具有使用灵活,功能强大的优点,是医学三维数据场可视化的有力工具。 相似文献
13.
有关钢结构地震作用的讨论 总被引：2，自引：0，他引：2
简要介绍了6本国内标准(TJ11-74、TJ11-78、GB J11-89、GB50011-2001、JG J99-98、CECS160:2004)有关钢结构地震作用的计算方法,包括荷载组合方法和底部剪力法。通过归一化后的结果比较,评价了各本标准地震作用的大小。分析表明,除JG J99-98和GB50011-2001 2本标准由于考虑钢结构的阻尼比为0.02或0.035后,其地震作用有显著增大外,其它4本标准的地震作用处于接近的水平。考虑到钢筋混凝土和砖石结构等的地震作用水平在新旧抗震规范中并无多大变化,过分提高抗震性能较优的钢结构的地震作用水平显然是不合理的。 相似文献
14.
15.
Occurrence of water ponding on soil surfaces depending on infiltration rates on Mongolian rangeland 
下载免费PDF全文
下载免费PDF全文 Katori Miyasaka Sho Shiozawa Kazuhiro Nishida Siilegmaa Batsukh Shuichiro Yoshida Undarmaa Jamsran 《水文研究》2017,31(22):3996-4005
The occurrence of water ponding on soil surfaces during and after heavy rainfall produces surface run‐off or surface water accumulation in low‐lying areas, which might reduce the water supply to soils and result in a reduction of the soil water that plants can use, especially in arid climates. On Mongolian rangeland, we observed ponded water on the surface of a specific soil condition subjected to a heavy rainfall of 30 mm/hr. By contrast, ponded water was not observed for the same type of soil where livestock grazing had been removed for 6–8 years via a fence or for nearby soil containing less clay. We measured the infiltration rate (the saturated hydraulic conductivity of the surface soil, Ks) of the three sites by applying ponded water on the soil surface (an intake rate test). The results showed that Ks in the rangeland was lower than the rainfall intensity in the site where water ponded on the soil surface; however, Ks of the soil inside of the fence has recovered to 3 times that of the soil outside of the fence to exceed the rainfall intensity. Heavy rainfall that exceeds the infiltration rate occurs several times a year at the livestock grazing site where we observed ponded water. Slight water repellency of the soil reduces rain infiltration to increase the possibility of surface ponding for the soil. 相似文献
16.
基于地震动参数的建筑物震害研究 总被引：15，自引：3，他引：12
本文介绍了多步简化的push—over(MSP)方法,引导出求解单体建筑物易损性指数和群体建筑物易损性指数的办法,并通过建筑物平均易损性指数曲线,来评价城市的总体抗震性能。本文不采用过去以烈度为地震输入的易损性评定方法,采用地震动参数作为城市建筑物易损性的评定标准。给出的易损性指数曲线,可用来查找不同地震动参数下各类建筑物的易损性结果,比较城市各类建筑物的抗震性能。本文研究可望在城市建筑物震害评估中有好的应用前景。 相似文献
17.
18.
断层错动对隧道的影响分析 总被引：1，自引：0，他引：1
隧道通过潜在地震地区时.存在活动断层的错动形成的重大工程地质问题的威胁.基于断裂儿何学和震源的运动学特征,以广州地区活动断裂为研究背景,通过在断层左右盘施加一定的速度荷载,模拟了断层错动达到0.28 m时对隧道的影响.得出隧道结构在断层错动影响下的位移和应力的变化规律.分别建立隧道结构距离断层50 m、100 m、150 m三个模型,比较了三种情况下的位移和应力状况.归纳出隧道与断层之间的安全距离. 相似文献
19.
Humans are exposed to ionizing radiation all the time, and it is known that it can induce a variety of harmful biological
effects. Consequently, it is necessary to quantitatively assess the level of exposure to this radiation as the basis for estimating
risks due to ionization radiation. During the Work Package 2400 of the COST-724/WG-2 action, a number of spacecraft and aircraft
experiments have been performed with both active and passive detectors. A large data base has been created.
In this contribution we would like to stress the results obtained and their importance in three particular directions: (i)
Simultaneous investigation of galactic cosmic rays on aircraft and on the International Space Station (ISS); (ii) Onboard
spacecraft neutron contribution as estimated on the basis of the comparison of results measured with MDU/Liulin equipment
onboard ISS, foton capsule and a commercial aircraft flying at subsonic altitudes; (iii) Complex analysis of the results of
long term measurements onboard a Czech Airlines aircraft. The results obtained are presented, analyzed, and discussed, and
their complementary nature is underlined. The contribution represents a version of the Final Report of the Work Package 2400
of the COST-724/WG-2: Radiation Environment of the Earth. 相似文献
20.
Discontinuous anchored piling support (anchored soldier piles without lagging) is one of the most frequent earth-retaining systems used in temporary deep excavations in Santiago, Chile. The main advantages of using discontinuous piling support are their relatively low cost and ease of installation. This system is particularly efficient on stiff soils with deep groundwater table, conditions usually found in Santiago. This paper presents a numerical investigation of the characteristics of earthquake induced lateral pressures on discontinuous pile-supported excavations in Santiago gravel. An equivalent bi-dimensional plane-strain model was developed on the basis of a more refined 3D model in order to quantify the influence of the “arching effect” on the dynamic lateral earth-pressures. The dynamic response was studied for a suite of Chilean ground motion recorded on rock in order to evaluate the variability of the dynamic pressures and their influence on the piles' internal forces. These results are then compared against some simplified design recommendations. 相似文献