全文获取类型
收费全文 | 30021篇 |
免费 | 969篇 |
国内免费 | 5587篇 |
专业分类
安全科学 | 1589篇 |
废物处理 | 1586篇 |
环保管理 | 2849篇 |
综合类 | 12486篇 |
基础理论 | 5759篇 |
环境理论 | 6篇 |
污染及防治 | 8377篇 |
评价与监测 | 1836篇 |
社会与环境 | 1343篇 |
灾害及防治 | 746篇 |
出版年
2023年 | 303篇 |
2022年 | 897篇 |
2021年 | 816篇 |
2020年 | 642篇 |
2019年 | 591篇 |
2018年 | 819篇 |
2017年 | 912篇 |
2016年 | 977篇 |
2015年 | 1112篇 |
2014年 | 1670篇 |
2013年 | 2622篇 |
2012年 | 1810篇 |
2011年 | 1977篇 |
2010年 | 1615篇 |
2009年 | 1657篇 |
2008年 | 1778篇 |
2007年 | 1582篇 |
2006年 | 1543篇 |
2005年 | 1136篇 |
2004年 | 925篇 |
2003年 | 991篇 |
2002年 | 916篇 |
2001年 | 948篇 |
2000年 | 808篇 |
1999年 | 639篇 |
1998年 | 450篇 |
1997年 | 495篇 |
1996年 | 456篇 |
1995年 | 410篇 |
1994年 | 350篇 |
1993年 | 271篇 |
1992年 | 294篇 |
1991年 | 241篇 |
1990年 | 236篇 |
1989年 | 168篇 |
1988年 | 184篇 |
1987年 | 117篇 |
1986年 | 142篇 |
1985年 | 136篇 |
1984年 | 129篇 |
1983年 | 122篇 |
1982年 | 132篇 |
1981年 | 128篇 |
1979年 | 99篇 |
1978年 | 101篇 |
1976年 | 93篇 |
1974年 | 104篇 |
1972年 | 87篇 |
1967年 | 100篇 |
1964年 | 92篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
11.
Tang Zhi Li Yilian Yang Zhe Liu Danqing Tang Min Yang Sen Tang Ye 《Environmental science and pollution research international》2019,26(20):20277-20285
Environmental Science and Pollution Research - The sorption/desorption behaviors of benzene, toluene, ethylbenzene, and xylene (BTEX) on soil organic matter (SOM) have a significant influence on... 相似文献
12.
Pham Thanh-Luu Tran Thi Hoang Yen Shimizu Kazuya Li Qintong Utsumi Motoo 《Environmental science and pollution research international》2021,28(45):63544-63557
Environmental Science and Pollution Research - Toxic cyanobacterial blooms (TCBs) have become a growing concern worldwide. The present study investigated the dynamic of toxic cyanobacteria and... 相似文献
13.
M. Kansanga P. Andersen D. Kpienbaareh S. Mason-Renton K. Atuoye Y. Sano 《国际发展与全球生态学杂志》2019,26(1):11-24
Following the renewed effort at achieving a new green revolution for Africa, emphasis has been placed on modernizing smallholder agriculture through the deployment of improved inputs especially mechanized technologies. In Ghana, the government has in the last decade emphasized the provision of subsidized mechanized ploughing services to farmers alongside a rapidly growing private sector tractor service market. While mechanized technology adoption rates have increased rapidly, the deployment of these technologies has been without critical analysis of the impacts on production patterns and local agrarian systems. This paper examines the distributional impacts of agriculture mechanization on cropping patterns and farm sizes of smallholder farmers in northern Ghana using Geographic Information Systems (GIS) techniques, and semi-structured interviews with smallholder farmers (n=60). Specifically, comparative analysis of the field sizes and cropping patterns of participant farmers prior to and after the adoption of mechanized technologies was conducted. In-depth interviews were used to contextualize the experiences of smallholder farmers toward understanding how mechanization may be impacting traditional agriculture. Our findings reveal a mechanization paradox in which farm sizes are expanding, while cropping patterns are shifting away from traditional staple crops (pearl millet and sorghum bicolor) to market-oriented crops (maize, rice and groundnuts). This transition we argue, has adverse implications on the cultural dimension of food security, the organization of social life, and climate change adaptation. We recommend a retooling of the current agricultural policy focus to ensure context sensitivity for a more robust battle against food insecurity. 相似文献
14.
Waste accumulation is a grave concern and becoming a transboundary challenge for environment. During Covid-19 pandemic, diverse type of waste were collected due to different practices employed in order to fight back the transmission rate of the virus. Covid-19 was proved to be capricious catastrophe of this 20th century and even not completely eradicated from the world. The havoc created by this imperceptible quick witted, pleomorphic deadly virus can't be ignored. Though a number of vaccines have been developed by the scientists but there is a fear of getting this virus again in our life. Medical studies prove that immunity drinks will help to reduce its reoccurrences. Coconut water is widely used among all drinks available globally. Its massive consumption created an incalculable pile of green coconut shells around the different corners of the world. This practice generating enormous problem of space acquisition for the environment. Both the environment and public health will benefit from an evaluation of quantity of coconut waste that is being thrown and its potential to generate value added products. With this context, present article has been planned to study different aspects like, coconut waste generation, its biological properties and environmental hazards associated with its accumulation. Additionally, this review illustrates, green technologies for production of different value added products from coconut waste. 相似文献
15.
16.
17.
Catastrophic disasters like earthquake and flood cause widespread destruction and financial devastation. This has brought disaster management into limelight making it a burgeoning academic research field. The remarkable rise of ICT (Information and Communication Technology) has instigated the scientific world to incorporate these technologies in disaster management. This study presents scientometric analysis to identify the status quo of research on the management of various disasters and role of ICT in it. This paper uses bibliographic data retrieved from Scopus for the observation period from 2011 to 2018. We provide extensive insights into growth of publications, citation pattern and their connectedness with other subject disciplines. Furthermore, we identify most productive and influential countries, institutes and journals. Our study analyses co-occurrence of keywords using Visualization of Similarities (VOS) Viewer. This structured overview will enhance the understanding of this field leading to more focussed and purposeful research. 相似文献
18.
19.
20.
A fragment constant QSAR model for evaluating the EC50 values of organic chemicals to Daphnia magna.
Shu Tao Xiaohuan Xi Fuliu Xu Bengang Li Jun Cao R Dawson 《Environmental pollution (Barking, Essex : 1987)》2002,116(1):57-64
The quantitative relationship between the median effective concentration (EC50) of organic chemicals to Daphnia magna and the number of molecular fragments was investigated based on experimental EC50 values for 217 chemicals derived from the literature. A fragment constant model was developed based on a multivariate linear regression between the number of fragments and the logarithmically transformed reciprocal values of EC50. Functional correction factors were introduced into the model. The model was verified using an independent set of randomly selected data. The mean residual of the final model was 0.4 log-units. The robustness of the model was discussed based on the results of three jackknife tests. 相似文献