全文获取类型
收费全文 | 7446篇 |
免费 | 597篇 |
国内免费 | 1382篇 |
专业分类
安全科学 | 1367篇 |
废物处理 | 109篇 |
环保管理 | 1096篇 |
综合类 | 4146篇 |
基础理论 | 903篇 |
污染及防治 | 487篇 |
评价与监测 | 598篇 |
社会与环境 | 358篇 |
灾害及防治 | 361篇 |
出版年
2024年 | 44篇 |
2023年 | 175篇 |
2022年 | 238篇 |
2021年 | 269篇 |
2020年 | 288篇 |
2019年 | 254篇 |
2018年 | 225篇 |
2017年 | 291篇 |
2016年 | 364篇 |
2015年 | 394篇 |
2014年 | 430篇 |
2013年 | 515篇 |
2012年 | 566篇 |
2011年 | 671篇 |
2010年 | 454篇 |
2009年 | 517篇 |
2008年 | 384篇 |
2007年 | 502篇 |
2006年 | 458篇 |
2005年 | 347篇 |
2004年 | 271篇 |
2003年 | 265篇 |
2002年 | 226篇 |
2001年 | 195篇 |
2000年 | 196篇 |
1999年 | 160篇 |
1998年 | 128篇 |
1997年 | 119篇 |
1996年 | 84篇 |
1995年 | 100篇 |
1994年 | 52篇 |
1993年 | 60篇 |
1992年 | 35篇 |
1991年 | 24篇 |
1990年 | 19篇 |
1989年 | 11篇 |
1988年 | 11篇 |
1987年 | 12篇 |
1986年 | 11篇 |
1985年 | 6篇 |
1984年 | 9篇 |
1983年 | 3篇 |
1982年 | 9篇 |
1981年 | 11篇 |
1980年 | 7篇 |
1979年 | 3篇 |
1978年 | 4篇 |
1977年 | 4篇 |
1975年 | 2篇 |
1973年 | 1篇 |
排序方式: 共有9425条查询结果,搜索用时 109 毫秒
971.
广深准高速铁路安全管理模式探讨 总被引:1,自引:0,他引:1
葛闻安 《中国安全科学学报》1995,5(4):7-9
广深准高速铁路的开通运营,以及广深铁路公司股份制改造,从客观上要求改革与优化铁路安全管理体制,建工新的铁路安全管理模式。本文构造了广深铁路安全管理模式,满足国家确定的“企业负责,行业管理,国家监察,群众监督”的安全工作体制要求,引入风险管理,实行事故保险,提出应该以安全文化作为新模式的软件,优化新的安全管理体制。 相似文献
972.
AHP法在废水治理工程评价中的应用 总被引:1,自引:0,他引:1
应用层次分析法(AHP)的原理,建立了废水处理工程的评价模型,并结合废水处理的实例进行了研究,结果证明了AHP法是评价废水处理工程的有效方法。 相似文献
973.
论区域环境规划与区域开发环境影响评价在区域开发环境管理中的作用和地位 总被引:3,自引:0,他引:3
回顾了国内外区域开发环境管理的发展历程,简要论述了区域环境规划与区域开发环境影响评价在区域开发环境管理中的作用和地位以及两者的相互关系。 相似文献
974.
In reaction to a paper inEnvironmental Management in which the sense and sensibility of environmental assessments of packaging were questioned, it is argued that these types
of assessments may be very useful, provided the relevant types of questions are posed. These boundary conditions are discussed,
along with an overview of more recent methodological developments with respect to environmental assessment of products. 相似文献
975.
Venkateswara R. Rao 《Environmental management》1995,19(3):313-320
Risk management practices under the current environmental regulations is a long, complex process that considers scientific,
technologic, and management factors to develop various regulatory standards and pollution control measures. Using the mandatory
enforcement approach, sometimes referred to as “command-and-control”, a set of preliminary environmental goals, such as better
air and water qualities, were achieved. However, the information-intensive nature of the risk management process and the lack
of flexibility in conventional regulatory methods to changing economic and technologic realities of the decade has created
interest among risk managers to examine some innovative management approaches. Above all, environmental problems of a global
scale require novel management methods while striving to achieve the desired environmental goals.
As the principal analytical tool in risk management, quantitative risk assessment exerts considerable influence on the risk
management process. Therefore, advances in risk management are closely associated with scientific developments that enhance
the risk assessment process, particularly those efforts aimed at improving human exposure and toxicity assessments. Market
incentives, information dissemination, creative enforcement practices, and interagency and intergovernmental interactions
were identified as the key elements of innovative environmental risk management practices. This paper will present an overview
of the emerging innovative risk management approaches. 相似文献
976.
在研究汕头市地震、风、洪潮、火等多种灾害的危险性、成灾模式和损失估计的基础上,应用地理信息系统(GIS)技术建立可视化的计算机综合防灾系统,可以提高城市的防灾能力。本文针对基于GIS的城市综合防灾系统的建立,提出了较为具体的研究方案和实施框架,便于课题组各项研究工作的开展和统一。 相似文献
977.
978.
本文介绍了黄土地区土壤侵蚀信息系统的建造原理与方法。分析探讨了土壤侵蚀各因子计算机自动提取的算法,以及土壤侵蚀预测模型的构造方法,并用灰色控制系统的原理确定了模型的参数。并以山西省离石县王家沟流域羊道沟为例进行了试验研究。 相似文献
979.
The proposed restoration of an abandoned hydroelectric dam on the Quinebaug River, Connecticut, is studied using energy analysis. The analysis considers the effects of alternative minimum flow releases, ranging from 0 to 34 cubic meters per second (cms), on the total energy flow of the affected system. The principal system components affected by differing minimum flows are hydroelectric power generation, aquatic habitat, and gross aquatic ecosystem productivity.The minimum flow alternative resulting in the highest annual energy flow in the affected system is considered optimal. From this purely analytical point of view, the optimum minimum flow is 0 cms, due to the short length and low productivity of the regulated reach, and the lack of floodplain interactions.Simulations of longer and more productive river reaches were conducted. For very short, unproductive reaches, in the absence of a floodplain, the contribution of aquatic community productivity to total system energy flow is negligible compared to hydroelectric generation. Optimum minimum flows are higher for longer and more productive reaches. For such cases the operation of hydroelectric dams could reduce total system energy flow because the energy supplied by hydroelectric generation may be offset by losses in aquatic productivity due to diminished riverine habitat. 相似文献
980.
Malcolm Hollick 《Environmental management》1984,8(3):191-196
The practice of EIA preparation in a number of states and countries is reviewed in the light of the need to avoid bias, integrate the EIA with project design, and make the proponent pay. It is concluded that the best arrangement may be to make the proponent responsible for EIA preparation and to advise a number of constraints designed to improve the quality of the studies and reduce bias. First, the proponent should be required to select a consultant from a register of those known to be honest, unbiased, technically competent, and capable of working with a design team. Second, two steering committees should be established to identify key issues, specify data collection and modeling programs and methods, and ensure that the study stays on course. 相似文献