全文获取类型
收费全文 | 4262篇 |
免费 | 299篇 |
国内免费 | 252篇 |
专业分类
安全科学 | 148篇 |
废物处理 | 99篇 |
环保管理 | 1572篇 |
综合类 | 1497篇 |
基础理论 | 585篇 |
环境理论 | 45篇 |
污染及防治 | 110篇 |
评价与监测 | 76篇 |
社会与环境 | 572篇 |
灾害及防治 | 109篇 |
出版年
2024年 | 9篇 |
2023年 | 50篇 |
2022年 | 63篇 |
2021年 | 100篇 |
2020年 | 110篇 |
2019年 | 142篇 |
2018年 | 122篇 |
2017年 | 212篇 |
2016年 | 195篇 |
2015年 | 157篇 |
2014年 | 145篇 |
2013年 | 222篇 |
2012年 | 215篇 |
2011年 | 271篇 |
2010年 | 183篇 |
2009年 | 238篇 |
2008年 | 171篇 |
2007年 | 245篇 |
2006年 | 202篇 |
2005年 | 202篇 |
2004年 | 166篇 |
2003年 | 154篇 |
2002年 | 152篇 |
2001年 | 127篇 |
2000年 | 146篇 |
1999年 | 122篇 |
1998年 | 74篇 |
1997年 | 84篇 |
1996年 | 77篇 |
1995年 | 75篇 |
1994年 | 58篇 |
1993年 | 64篇 |
1992年 | 33篇 |
1991年 | 36篇 |
1990年 | 29篇 |
1989年 | 15篇 |
1988年 | 11篇 |
1987年 | 7篇 |
1986年 | 12篇 |
1985年 | 18篇 |
1984年 | 10篇 |
1983年 | 9篇 |
1982年 | 8篇 |
1980年 | 7篇 |
1979年 | 15篇 |
1978年 | 8篇 |
1977年 | 7篇 |
1973年 | 9篇 |
1972年 | 5篇 |
1971年 | 10篇 |
排序方式: 共有4813条查询结果,搜索用时 843 毫秒
781.
随着全球化的气候问题日益严重和“低碳革命”的兴起,低碳物流已成为现代物流业发展的必然趋势.结合国内外学者对低碳物流的研究文献,从物流过程的碳排放测量、物流环节的低碳控制、物流系统的低碳设计方面系统回顾了国内外学者在低碳物流领域的研究成果,梳理了低碳物流的发展历程,并对现有的研究成果进行了分析,以期为相关学者的后续研究提供思路. 相似文献
782.
783.
784.
Community-level resource management efforts are cornerstones in ensuring sustainable use of natural resources. Yet, understanding how community characteristics influence management practices remains contested. With a sample size of ≥725 communities, we assessed the effects of key community (i.e., socioeconomic) characteristics (human population size and density, market integration, and modernization) on the probability of occurrence of fisheries management practices, including gear, species, and spatial restrictions. The study was based in Solomon Islands, a Pacific Island country with a population that is highly dependent on coastal fisheries. People primarily dwell in small communities adjacent to the coastline dispersed across 6 island provinces and numerous smaller islands. We used nationally collected data in binomial logistic regression models to examine the likelihood of management occurrence, given socioeconomic context of communities. In contrast to prevailing views, we identified a positive and statistically significant association between both human population size and market integration and all 3 management practices. Human population density, however, had a statistically significant negative association and modernization a varied and limited association with occurrence of all management practices. Our method offers a way to remotely predict the occurrence of resource management practices based on key socioeconomic characteristics. It could be used to improve understanding of why some communities conduct natural resource management activities when statistical patterns suggest they are not likely to and thus improve understanding of how some communities of people beat the odds despite limited market access and high population density. 相似文献
785.
1998年中国大陆地震灾害评述 总被引:3,自引:1,他引:3
在列出1998年5级以上地震目录的基础上,结合有关省地震局的地震灾害评估资料,总结了1998年大陆震灾害的主要数据和特性并与1990 ̄197年相应数据的特征进行了比较 。 相似文献
786.
Christa N. Brunnschweiler Erwin H. Bulte 《Journal of Environmental Economics and Management》2008,55(3):248-264
We critically evaluate the empirical basis for the so-called resource curse and find that, despite the topic's popularity in economics and political science research, this apparent paradox may be a red herring. The most commonly used measure of “resource abundance” can be more usefully interpreted as a proxy for “resource dependence”—endogenous to underlying structural factors. In multiple estimations that combine resource abundance and dependence, institutional, and constitutional variables, we find that (i) resource abundance, constitutions, and institutions determine resource dependence, (ii) resource dependence does not affect growth, and (iii) resource abundance positively affects growth and institutional quality. 相似文献
787.
分析现有中药废水处理工艺及废水特点,并考虑到废水处理技术改造的要求,采用水解酸化-SBR-BAF法联合处理该中药废水,研究了SBR反应器的曝气时间、温度及原水pH值对系统处理效果的影响。系统进水ρ(COD)为1 249.4~1 444.5 mg/L、ρ(BOD5)为201.2~292.8 mg/L、ρ(SS)为208.7~310.6 mg/L、色度为70~100倍,曝气时间为14 h、温度为20℃、pH值为7时,出水ρ(COD)为123.4~140.8 mg/L、ρ(BOD5)为19.4~26.1 mg/L、ρ(SS)为32.7~60.4 mg/L、色度为36~50倍,COD、BOD5、SS的平均去除率分别达到90.3%、90.7%、81.8%,表明HAT-SBR-BAF法处理该中药废水是可行的。 相似文献
788.
The Chinese sturgeon, Acipenser sinensis, is an anadromous protected species. Its migration pattern has been blocked since the construction of Gezhouba dam and the length of the natural spawning site reduced to less than 7 km. However, the fish eventually established an alternative spawning ground in the narrow downstream reach of Gezhouba dam. In this article, we applied Delft3D-Flow model to simulate the hydraulic suitability of the spawning ground downstream Gezhouba dam. Horizontal mean vorticity was used to assess the hydraulic environment of spawning ground. The flow field state was determined through model simulation and field-measured data used to validate the model. The computational method was improved by calculating absolute horizontal mean vorticity from estimates the literature. The final vorticity was determined from the simulation output and its distribution pattern retrieved. The horizontal mean vorticity range was 0.71–4.61 10−3 s−1 for the entire spawning grounds, with egg mass field upper limit of 1.0 × 10−3 s−1. Vorticity strength selection of Chinese sturgeon spawning can enhance our understanding of egg fertilization rate, hence the protection of fertilized eggs. Furthermore, the results of the study would add to existing scientific database for spawning ground hydraulic environment protection, especially in the ecological regulation drive of the Three Gorges Reservoir. 相似文献
789.
790.
Carmen Arguedas Daan P. van Soest 《Journal of Environmental Economics and Management》2009,58(2):192-205
Investment subsidies are widely used to induce adoption of new technologies that can lower the (marginal) cost of reducing emissions. To economize on these subsidies, governments would like to distinguish between firms that need to receive a subsidy to adopt a new technology, and firms that would adopt that technology even without subsidies. We show that policies consisting of a menu of emission taxes and investment subsidies can potentially induce firms to self-select. 相似文献