全文获取类型
收费全文 | 10583篇 |
免费 | 450篇 |
国内免费 | 3006篇 |
专业分类
安全科学 | 669篇 |
废物处理 | 608篇 |
环保管理 | 1062篇 |
综合类 | 4750篇 |
基础理论 | 1995篇 |
环境理论 | 5篇 |
污染及防治 | 3667篇 |
评价与监测 | 488篇 |
社会与环境 | 417篇 |
灾害及防治 | 378篇 |
出版年
2024年 | 14篇 |
2023年 | 176篇 |
2022年 | 481篇 |
2021年 | 421篇 |
2020年 | 308篇 |
2019年 | 331篇 |
2018年 | 351篇 |
2017年 | 436篇 |
2016年 | 478篇 |
2015年 | 474篇 |
2014年 | 706篇 |
2013年 | 1028篇 |
2012年 | 808篇 |
2011年 | 877篇 |
2010年 | 659篇 |
2009年 | 609篇 |
2008年 | 736篇 |
2007年 | 587篇 |
2006年 | 591篇 |
2005年 | 402篇 |
2004年 | 321篇 |
2003年 | 377篇 |
2002年 | 347篇 |
2001年 | 257篇 |
2000年 | 318篇 |
1999年 | 306篇 |
1998年 | 248篇 |
1997年 | 230篇 |
1996年 | 212篇 |
1995年 | 171篇 |
1994年 | 136篇 |
1993年 | 127篇 |
1992年 | 117篇 |
1991年 | 90篇 |
1990年 | 42篇 |
1989年 | 46篇 |
1988年 | 36篇 |
1987年 | 26篇 |
1986年 | 25篇 |
1985年 | 19篇 |
1984年 | 11篇 |
1983年 | 14篇 |
1982年 | 22篇 |
1981年 | 20篇 |
1980年 | 4篇 |
1979年 | 7篇 |
1978年 | 7篇 |
1977年 | 5篇 |
1975年 | 4篇 |
1969年 | 4篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
1.
Yang Nian Chen Lei Wang Wenzhuo Shen Zhenyao 《Environmental science and pollution research international》2021,28(37):51356-51368
Environmental Science and Pollution Research - At present, the contradiction between survival and ecology necessitates the integration of crop planting, chemical fertilizer application, and... 相似文献
2.
Yang Jian Hong Chen Xing Yi Zheng Zixuan Li Zaixing Zhao Xiumei Qi Chenhao 《Environmental science and pollution research international》2021,28(7):7621-7635
Environmental Science and Pollution Research - Hydrothermal liquefaction (HTL) of biomass used HTL reaction under high temperature and pressure to produce bio-oil. This technology is considered as... 相似文献
3.
Ecologically relevant traits of organisms in an assemblage determine an ecosystem's functional fingerprint (i.e., the shape, size, and position of multidimensional trait space). Quantifying changes in functional fingerprints can therefore provide information about the effects of diversity loss or gain through time on ecosystem condition and is a promising approach to monitoring ecological integrity. This, however, is seldom possible owing to limitations in historical surveys and a lack of data on organismal traits, particularly in diverse tropical regions. Using data from detailed bird surveys from 4 periods across more than a century, and morphological and ecological traits of 233 species, we quantified changes in the avian functional fingerprint of a tropical montane forest in the Andes of Colombia. We found that 78% of the variation in functional space, regardless of period, was described by 3 major axes summarizing body size, dispersal ability (indexed by wing shape), and habitat breadth. Changes in species composition significantly altered the functional fingerprint of the assemblage and functional richness and dispersion decreased 35–60%. Owing to species extirpations and to novel additions to the assemblage, functional space decreased over time, but at least 11% of its volume in the 2010s extended to areas of functional space that were unoccupied in the 1910s. The assemblage now includes fewer large-sized species, more species with greater dispersal ability, and fewer habitat specialists. Extirpated species had high functional uniqueness and distinctiveness, resulting in large reductions in functional richness and dispersion after their loss, which implies important consequences for ecosystem integrity. Conservation efforts aimed at maintaining ecosystem function must move beyond seeking to sustain species numbers to designing complementary strategies for the maintenance of ecological function by identifying and conserving species with traits conferring high vulnerability such as large body size, poor dispersal ability, and greater habitat specialization. Article impact statement: Changes in functional fingerprints provide a means to quantify the integrity of ecological assemblages affected by diversity loss or gain. 相似文献
4.
Baek Kitae Alessi Daniel S. Man Yu Bon Kwon Eilhann E. 《Environmental geochemistry and health》2021,43(9):3261-3262
Environmental Geochemistry and Health - 相似文献
5.
陈光辉 《中国个体防护装备》2015,(1):41-43
本文从医学测试、体质测试和心理测试三个方面论述了消防员职业健康测试项目研究的重要性,以促进我国消防员职业健康研究水平的提高。 相似文献
6.
7.
8.
9.
Daniel H Zitomer Prasoon Adhikari Craig Heisel Dennis Dineen 《Water environment research》2008,80(3):229-237
Codigestion of five wastes and municipal wastewater sludge was evaluated using full-scale testing. Synergistic, antagonistic, and neutral outcomes were observed depending on codigestate identity and concentration, highlighting the value of careful blending. Yeast waste resulted in notable synergism, increasing biogas production by over 50%, whereas aircraft deicing waste resulted in antagonism at high loadings and neutral outcomes at lower loadings. Restaurant waste codigestion resulted in neutral outcomes. The synergisim with yeast codigestates may have resulted from trace nutrients (i.e., iron, nickel, and cobalt) in the wastes that increased microbiological activity. Antagonist outcomes with deicing waste may have been the result of organic overload or inhibitory deicer constituents. Codigestion of wastes at the feed rates investigated was estimated to produce 0.50 ML/d of methane having an energy equivalent of 17 500 MJ/d. This was estimated to reduce net carbon dioxide emissions by 560 tonnes/y. 相似文献
10.
重点开发长江是90年代中国经济重大战略布署。将长江产业带建设成具有强大经济实力的国家一级经济轴线,宜采用分层次推进与中心辐射相结合的发展战略,以浦东开发和三峡建设为契机,加强基础产业,发展新兴产业和第三产业,优化产业结构,以能源和交通建设先行,改善基础设施。同时,要协调产业带建设与浦东开发、三峡工程建设的关系。 相似文献