全文获取类型
收费全文 | 890篇 |
免费 | 34篇 |
国内免费 | 33篇 |
专业分类
安全科学 | 38篇 |
环保管理 | 255篇 |
综合类 | 120篇 |
基础理论 | 24篇 |
污染及防治 | 4篇 |
评价与监测 | 8篇 |
社会与环境 | 107篇 |
灾害及防治 | 401篇 |
出版年
2023年 | 5篇 |
2022年 | 13篇 |
2021年 | 13篇 |
2020年 | 12篇 |
2019年 | 13篇 |
2018年 | 15篇 |
2017年 | 17篇 |
2016年 | 25篇 |
2015年 | 26篇 |
2014年 | 11篇 |
2013年 | 34篇 |
2012年 | 36篇 |
2011年 | 60篇 |
2010年 | 31篇 |
2009年 | 31篇 |
2008年 | 18篇 |
2007年 | 40篇 |
2006年 | 46篇 |
2005年 | 53篇 |
2004年 | 43篇 |
2003年 | 35篇 |
2002年 | 53篇 |
2001年 | 33篇 |
2000年 | 46篇 |
1999年 | 34篇 |
1998年 | 13篇 |
1997年 | 10篇 |
1996年 | 8篇 |
1995年 | 12篇 |
1994年 | 19篇 |
1993年 | 9篇 |
1992年 | 8篇 |
1991年 | 11篇 |
1990年 | 6篇 |
1989年 | 9篇 |
1988年 | 4篇 |
1987年 | 7篇 |
1985年 | 6篇 |
1984年 | 7篇 |
1983年 | 4篇 |
1982年 | 10篇 |
1981年 | 12篇 |
1980年 | 11篇 |
1979年 | 12篇 |
1978年 | 7篇 |
1977年 | 4篇 |
1976年 | 4篇 |
1975年 | 4篇 |
1974年 | 3篇 |
1972年 | 6篇 |
排序方式: 共有957条查询结果,搜索用时 234 毫秒
141.
142.
人类活动对流域旱涝事件具有决定性影响,已经成为国内外热点研究问题之一。通过系统分析国内外人类活动对流域旱涝事件影响机理的研究,结果表明:人类活动导致大气温室气体和气溶胶含量上升,全球气候变化加剧,导致流域极端水文过程时空格局改变。另一方面,人类活动引起的土地退化将影响流域水资源时空分布和水循环过程,削弱流域防洪抗旱能力;水利工程的修建将增大流域储水状况,有效应对流域旱涝事件,但同时存在加剧流域旱涝事件的风险。此外,论文还概述了人类活动对流域旱涝事件影响的量化方法。 相似文献
143.
SUMMARY This paper is concerned with a twenty-five year campaign against the relocation of the Komatsu-Tenmangu shrine as a result of the enlargement of the Kakehashi river. The Komatsu-Tenmangu shrine is an important cultural property of Japan, and was constructed by Toshitsune Maeda, the third dynasty of the Kaga clan in 1657. It is suggested that the primary reason why it took so long to settle this issue is a flaw in our social system for managing public works. It is concluded that preservation of cultural property is not always contrary to land development, and that the proposed procedures or something like them must be put into practice for the real expansion of our culture. 相似文献
144.
145.
146.
《Environmental Hazards》2013,12(1):15-22
Abstract New technologies promise reduced flash flood losses. However, real-time observations with vast multi-sensor networks, more precise mapping capabilities using remote sensing and GIS, quicker hydrological and meteorological models, and increasing forecast lead times have not reduced losses. In November, 1999, 35 researchers from nine countries met in Ravello, Italy at a NATO sponsored Advanced Study Institute, to discuss these issues and to develop a research agenda that incorporates the various components required to cope with flash floods. The key recommendations from the Institute were: (1) greater emphasis on increasing understanding of the social processes involved in flash flood warning, particularly in the response phases, and (2) the need to reduce vulnerability in sustainable ways compatible with long-term economic and social goals. The relationship between hydrometeorology and social science is seen as critical to advancing our abilities to cope with flash floods. 相似文献
147.
148.
为提高公路隧道整体安全性能,保障人员安全,减少财产损失,避免公路隧道水害事故的发生,将Bayes判别理论应用于公路隧道水害倾向性判别和分级中。采用影响隧道水害发生的隧道区渗透系数、降水情况、单位涌水量、构造断裂带类型、围岩分级、隧道施工情况、防排水措施情况等7项指标作为基本判别因子;将公路隧道水害倾向性分为4个等级作为Bayes判别分析的4个正态总体。以采自典型的20组公路隧道的实测数据为训练样本,建立公路隧道水害倾向性分级的Bayes判别函数。对训练后的模型运用交叉确认估计法进行验证,然后运用该模型对6条待检验的公路隧道样本的水害倾向性进行分级。研究结果表明:构建的Bayes判别分析模型误判率极低,分级效果合理有效,可以运用于公路隧道水害倾向性的分级中,有利于公路隧道水害的预防和治理。 相似文献
149.
Robert Šakić Trogrlić Grant B. Wright Adebayo J. Adeloye Melanie J. Duncan Faidess Mwale 《Environmental Hazards》2018,17(2):107-127
Current flood risk strategies in Malawi are characterized by community-based flood risk management (CB-FRM), even though studies explicitly documenting evidence of successful CB-FRM remain limited. This paper investigates the realities and challenges of CB-FRM as seen through a lens of different stakeholders. In order to capture the experiences of CB-FRM, a predominantly qualitative research framework was developed. In 2016, 11 focus group discussions with stakeholder groups (local communities, local government and non-governmental organisations) were held. Additionally, informal discussions, field visits, a short survey and an extensive desk study were undertaken. The findings were analysed according to the major themes that emerged related to the realities and challenges of specific stakeholder groups. Although response and relief still remain prominent components of CB-FRM in Malawi, a number of mitigation and preparedness activities is observed. However, a lack of in-country resources, relief-oriented aid approaches and an ‘aid dependency’ syndrome represent obstacles. Different stakeholder groups share similar challenges in terms of financing, participation, decentralised governance and project management. Lack of project sustainability and localised ownership also emerged as major challenges. The identified challenges shed light on the frontiers and directions in which improvements are needed, thus offering a valuable contribution to the existing knowledgebase. 相似文献
150.
This paper presents the results of research investigating the impact of flooding on the temporal aspect of transport accessibility at national, regional and local levels in the Mazovia Province – an administrative region in Poland. For the purposes of this study the authors measured the theoretical journey times by private transport between settlement units for two variants: journeys made under normal circumstances, that is, without a flood; and journeys made during a flood event, which would necessitate diversions to avoid flooded road sections. This allowed the theoretical journey time differences to be calculated. It was assumed that vehicles move at the highest permissible speed along routes allowing the shortest travel times. The methods of accessibility assessment employed in this paper are based on distance measurements and use isochrones and a cumulative approach. Analysis carried out by the authors has shown that for interregional, intraregional and local journeys, the flooding of a part of the Mazovia region results in changes in travel times, but their absolute and relative magnitudes vary widely. It was found that in the case of national scale journeys the majority of relative journey time increases were no greater than three times the normal duration, while on a local scale they do not exceed 75%. For areas with a high risk of flooding there should be obligatory analyses of changes in transport accessibility; this would facilitate effective flood risk management. Appropriate traffic management in crisis situations would facilitate emergency and rescue services and help inhabitants and any other persons in flooded areas. 相似文献