全文获取类型
收费全文 | 442篇 |
免费 | 25篇 |
国内免费 | 26篇 |
专业分类
安全科学 | 38篇 |
废物处理 | 1篇 |
环保管理 | 92篇 |
综合类 | 126篇 |
基础理论 | 60篇 |
环境理论 | 4篇 |
污染及防治 | 13篇 |
评价与监测 | 8篇 |
社会与环境 | 21篇 |
灾害及防治 | 130篇 |
出版年
2023年 | 8篇 |
2022年 | 11篇 |
2021年 | 17篇 |
2020年 | 17篇 |
2019年 | 17篇 |
2018年 | 19篇 |
2017年 | 15篇 |
2016年 | 26篇 |
2015年 | 26篇 |
2014年 | 9篇 |
2013年 | 33篇 |
2012年 | 16篇 |
2011年 | 23篇 |
2010年 | 23篇 |
2009年 | 20篇 |
2008年 | 13篇 |
2007年 | 23篇 |
2006年 | 28篇 |
2005年 | 21篇 |
2004年 | 12篇 |
2003年 | 17篇 |
2002年 | 15篇 |
2001年 | 13篇 |
2000年 | 18篇 |
1999年 | 13篇 |
1998年 | 3篇 |
1997年 | 5篇 |
1996年 | 6篇 |
1995年 | 6篇 |
1994年 | 7篇 |
1992年 | 3篇 |
1991年 | 2篇 |
1990年 | 1篇 |
1987年 | 2篇 |
1984年 | 1篇 |
1983年 | 2篇 |
1981年 | 1篇 |
1980年 | 1篇 |
排序方式: 共有493条查询结果,搜索用时 31 毫秒
451.
Richard H. French Julianne Miller Steve Curtis 《Journal of the American Water Resources Association》2003,39(2):477-486
ABSTRACT: On February 23–24, 1998, a frontal system moved across the U.S. Department of Energy's 3,500 km2 Nevada Test Site (NTS) and resulted in significant depths of precipitation at all recording gages on the NTS. A preliminary analysis suggested that this precipitation event was of the magnitude and duration for which many flood mitigation structures have been designed. Given the data and field observations available and the potential implications of the event on the methodologies used to size flood mitigation structures throughout the West, a detailed analysis of this event was undertaken. The goals of this study were to compare this event with the regulatory design precipitation event, compare the estimated peak flow rates from the rainfall/runoff model used to size the flood mitigation structures at a radioactive waste management site with the estimated peak flows from the precipitation event, and examine if modification of the standard source of the design depths of precipitation is warranted. 相似文献
452.
453.
山区城镇泥石流减灾决策支持系统 总被引:11,自引:2,他引:11
山区城镇泥石流减灾决策支持系统是山区城镇泥石流减灾的重要手段之一。该系统由基础数据库、泥石流模型分析和泥石流减灾决策应用三大模块构成 ,其主要功能有降水、泥石流地声和运动监测及信息实时发送和接收、泥石流预报、泥石流危险范围预测与灾情预估、泥石流警报和临灾预案制定。其工作流程为 :降水监测仪将降水信息无线发送到控制中心主机 ,主机对降水信息处理后发送给泥石流预报模型进行泥石流预报 ,并利用泥石流危险性分区模型进行危险范围预测 ,同时进行灾情预估 ;泥石流地声监测仪将地声信号发送给主机 ,主机检测到泥石流地声后发出泥石流警报 ;泥石流运动监测仪将运动信息发送给主机 ,主机根据泥石流运动要素进行危险范围划定和灾情预估 ,最后制定临灾预案。 相似文献
454.
N. H. Ravindranath I. K. Murthy R. K. Chaturvedi K. Andrasko J. A. Sathaye 《Mitigation and Adaptation Strategies for Global Change》2007,12(6):1027-1050
Carbon forestry mitigation potential estimates at the global-level are limited by the absence or simplicity of national-level
estimates, and similarly national-level estimates are limited by absence of regional-level estimates. The present study aims
to estimate the mitigation potential for a large diverse country such as India, based on the GTAP global land classification
system of agro-ecological zones (AEZs), as well the Indian AEZ system. The study also estimates the implications of carbon
price incentive (US$50 and $100) on mitigation potential in the short-, medium- and long-term, since afforestation and reforestation
(A & R) is constrained by lack of investment and financial incentives. The mitigation potential for short and long rotation
plantations and natural regeneration was estimated using the GCOMAP global forest model for two land area scenarios. One scenario
included only wastelands (29 Mha), and the second enhanced area scenario, included wastelands plus long fallow and marginal
croplands (54 Mha). Under the $100 carbon price case, significant additional area (3.6 Mha under the wasteland scenario and
6.4 Mha under the enhanced area scenario) and carbon mitigation is gained in the short-term (2025) compared to the baseline
when using the GTAP land classification system. The area brought under A & R increases by 85–100% for the $100 carbon price
compared to $50 carbon price in the short-term, indicating the effectiveness of higher carbon price incentives, especially
in the short-term.
A comparison of estimates of mitigation potential using GTAP and Indian AEZ land classification systems showed that in the
short-term, 35% additional C-stock gain is achieved in the $100 carbon price case in the enhanced area scenario of the Indian
AEZ system. This difference highlights the role of the land classification system adopted in estimation of aggregate mitigation
potential estimates, particularly in the short-term. Uncertainty involved in the estimates of national-level mitigation potential
needs to be reduced, by generating reliable estimates of carbon stock gain and losses, and cost and benefit data, for land
use sector mitigation options at a scale disaggregated enough to be relevant for national mitigation planning. 相似文献
455.
Carbon farming policies aim to contribute to climate change mitigation, but their success strongly depends on whether landholders actually adopt desired practices or participate in offered programs. The Australian Government’s Carbon Farming Initiative and Emissions Reduction Fund policies were designed to incentivise the adoption of carbon farming practices. Although these policies have been active since December 2011, farmer engagement has been limited, and net emissions reductions low as a result. We surveyed broad-acre farmers in the Western Australian wheatbelt to explore their drivers and barriers to adopting carbon farming practices and participating in carbon farming policy programs. Drivers of adoption included knowledge and perception of co-benefits (for yield, productivity, and the environment), knowing another adopter, and believing that changes to farm management are an appropriate method to reduce Australia’s greenhouse gas emissions. Barriers to adoption included lack of information, uncertainty and costs. The key barrier to participation was policy and political uncertainty. The determinants of adoption and participation that we identify in our study offer important insights into how to best ensure the success of Australia’s land sector-based climate change policies. We conclude that, to increase landholder engagement, the co-benefits and climate change benefits of carbon farming practices must be actively promoted, and additional information is needed about the costs associated with adoption. Information diffusion is best achieved if it actively leverages landholder social networks. Finally, our results indicate that landholder buy-in to carbon farming could be greatly enhanced by achieving more continuity in Australian climate change policies and politics. 相似文献
456.
试论安全减灾科学技术 总被引:2,自引:0,他引:2
自90 年代初中期安全科学技术, 已获得国家一级学科地位, 但从综合减灾的观点考虑,仍需完善和拓展。减灾与安全有其共性, 减灾的成效与否必须树立综合的大安全减灾观。安全、减灾、环保相关学科的渗透与交叉, 将会使 21 世纪的减灾事业变得更加兴旺、更加繁荣 相似文献
457.
An essential component of disaster planning and preparation is the identification and selection of temporary disaster debris management sites (DMS). However, since DMS identification is a complex process involving numerous variable constraints, many regional, county and municipal jurisdictions initiate this process during the post‐disaster response and recovery phases, typically a period of severely stressed resources. Hence, a pre‐disaster approach in identifying the most likely sites based on the number of locational constraints would significantly contribute to disaster debris management planning. As disasters vary in their nature, location and extent, an effective approach must facilitate scalability, flexibility and adaptability to variable local requirements, while also being generalisable to other regions and geographical extents. This study demonstrates the use of binomial cluster analysis in potential DMS identification in a case study conducted in Hamilton County, Indiana. 相似文献
458.
Henry Ngenyam Bang 《Disasters》2014,38(3):562-586
Efficient and effective disaster management will prevent many hazardous events from becoming disasters. This paper constitutes the most comprehensive document on the natural disaster management framework of Cameroon. It reviews critically disaster management in Cameroon, examining the various legislative, institutional, and administrative frameworks that help to facilitate the process. Furthermore, it illuminates the vital role that disaster managers at the national, regional, and local level play to ease the process. Using empirical data, the study analyses the efficiency and effectiveness of the actions of disaster managers. Its findings reveal inadequate disaster management policies, poor coordination between disaster management institutions at the national level, the lack of trained disaster managers, a skewed disaster management system, and a top‐down hierarchical structure within Cameroon's disaster management framework. By scrutinising the disaster management framework of the country, policy recommendations based on the research findings are made on the institutional and administrative frameworks. 相似文献
459.
为减轻城市灾害损失,提出城市防灾减灾规划编制方法,将减灾规划分为准备、风险分析、编制和实施4个步骤。依据风险分析结果,制订防灾减灾规划目标、减灾措施及策略。给出典型的地震灾害风险分析方法。以某市为例,算出其各区域的地震风险。根据风险等级划分标准确定各区域的地震风险可接受水平。基于此结果在GIS平台上的表达,可知市内旧城区的地震风险很高,须立刻采取风险减缓措施。对减灾措施进行优化,结果表明:加快现有设防不足工程的抗震加固,严抓新建工程的抗震设防水准是提高该市抗震减震能力的关键。 相似文献
460.
为了研究城市燃气管线泄漏致灾灾害链,对灾害链的形成机理进行分析,建立灾害链模型,并通过计算灾害链发生概率对灾害链断链减灾方法进行研究。结果表明,城市燃气管线泄漏致灾灾害链可分为致灾环、激发环、损害环三部分;灾害链中因管道裂纹导致的中毒窒息灾害事故、管道穿孔导致的中毒窒息灾害事故及火灾等链条的发生概率较高;致灾环是灾害链断链减灾的关键环节,在城市安全管理中应落实应急预案制度并加强对城市居民的防灾减灾安全教育力度。 相似文献