全文获取类型
收费全文 | 1619篇 |
免费 | 123篇 |
国内免费 | 564篇 |
专业分类
安全科学 | 112篇 |
废物处理 | 102篇 |
环保管理 | 108篇 |
综合类 | 944篇 |
基础理论 | 296篇 |
环境理论 | 1篇 |
污染及防治 | 518篇 |
评价与监测 | 87篇 |
社会与环境 | 61篇 |
灾害及防治 | 77篇 |
出版年
2024年 | 3篇 |
2023年 | 36篇 |
2022年 | 116篇 |
2021年 | 110篇 |
2020年 | 88篇 |
2019年 | 58篇 |
2018年 | 58篇 |
2017年 | 115篇 |
2016年 | 88篇 |
2015年 | 103篇 |
2014年 | 133篇 |
2013年 | 182篇 |
2012年 | 157篇 |
2011年 | 138篇 |
2010年 | 127篇 |
2009年 | 113篇 |
2008年 | 118篇 |
2007年 | 82篇 |
2006年 | 67篇 |
2005年 | 43篇 |
2004年 | 36篇 |
2003年 | 39篇 |
2002年 | 39篇 |
2001年 | 36篇 |
2000年 | 39篇 |
1999年 | 35篇 |
1998年 | 25篇 |
1997年 | 27篇 |
1996年 | 23篇 |
1995年 | 18篇 |
1994年 | 13篇 |
1993年 | 19篇 |
1992年 | 6篇 |
1991年 | 5篇 |
1990年 | 4篇 |
1989年 | 2篇 |
1987年 | 1篇 |
1986年 | 1篇 |
1985年 | 2篇 |
1973年 | 1篇 |
排序方式: 共有2306条查询结果,搜索用时 234 毫秒
81.
Guangxin Liu Fengrui Jia Qiang Yue Danzhu Ma Handan Pan Ming Wu 《Environment, Development and Sustainability》2016,18(1):221-235
Nonferrous metal is an important basis material for the development of the national economy, and its consumption directly affects economic development. It has great significance in the effective utilization of nonferrous metals, development of an environment-friendly society, and investigation of the decoupling of nonferrous metal consumption and GDP growth. The decoupling indicators for nonferrous metal consumption and GDP growth (D r) in China from 1995 to 2010 were calculated in this study, and the results were analyzed. A productive model based on BP neural network was established. Then, the decoupling indicators for nonferrous metal consumption and GDP growth in China for the period of 2011–2020 were predicted. For the period of 1995–2010, the annual average decoupling indicators were <1 for copper, aluminum, zinc, lead, and nickel, except for tin, which was 0.21. The analysis showed that the decoupling of nonferrous metal consumption and GDP growth is in a less optimistic situation to copper, aluminum, zinc, lead, and nickel in China from 1995 to 2010. The annual average decoupling indicator for tin was 0.21, which indicates relative decoupling. For the period of 2011–2020, the predicted decoupling indicators for copper, aluminum, zinc, lead, nickel, and tin were between 0 and 1. This finding indicates the implementation of relative decoupling. However, the total consumption of nonferrous metals did not decouple from GDP growth. 相似文献
82.
Peipei Wang Lili Zhang Li Liu Ling Chen Hongwen Gao Lingling Wu 《Environmental science and pollution research international》2015,22(21):16423-16433
Toxicity evaluation is an important segment in sediment quality monitoring in order to protect aquatic organisms and human health. The purpose of this study is to assess the toxicity of sediments from three sediment cores in Yangtze River Estuary, China, using the zebrafish (Danio rerio) embryo tests. Fertilized zebrafish eggs were exposed to both whole sediments and sediment organic extracts prepared from collected sediments, in order to provide a comprehensive and realistic insight into the bioavailable toxicity potential of the sediments. As end points, development parameters (mortality, hatching rate, and abnormality) in the developing embryos were recorded during the 96-h exposure. The results showed that some samples increased mortality, inhibited the hatching of embryos, and induced morphological abnormalities. The embryonic toxicities presented serrated changes and irregular distribution with depth, which may be related to hydrodynamic effect and unstable environmental input. However, lethal and sub-lethal effects were more significant at the sub-surface sediments (10~40 cm), which indicated that the pollution is more serious in recent decades. 相似文献
83.
Enhanced rice production but greatly reduced carbon emission following biochar amendment in a metal-polluted rice paddy 总被引:1,自引:0,他引:1
84.
餐厨垃圾中有机物大部分以大分子的形式存在,对其进行热处理,破坏大分子有机物的存在形式,将会影响其干式厌氧发酵的过程。实验对餐厨垃圾进行了热处理(100℃),处理后将其在含固率(TS)20%、接种率25%的条件下进行高温55℃厌氧发酵。实验结果表明,热处理后,餐厨垃圾的理化性质发生显著变化,累计产气量、TS和VS的去除率均增大。当热处理时间为15 min时,餐厨垃圾的SCOD值最高,为59.49 g/L,比未处理时提高了3.3倍。同样该条件下,累计产气量也最高,为2 782.8 m L,与未处理相比累积产气量提高58.30%,第二产气高峰比未处理提前3天。各发酵瓶发酵前后TS、VS去除率的变化趋势与累计产气量的变化基本一致,累计产气量越大,TS、VS的去除率越大。 相似文献
85.
86.
以钛涂钌电极为阳极、自制蒽醌修饰石墨毡电极为阴极,对头孢合成废水(COD=25 000~30 000 mg/L、ρ(NH3-N)=850~1 300 mg/L、色度为2 300~2 680度)进行了电化学氧化预处理,优化了电解条件,并对电化学体系的动力学和稳定性进行了分析。实验结果表明:蒽醌的存在可改善电化学氧化降解效果;在电解时间50 min、电流密度0.14 A/cm2、Na2SO4浓度0.1 mol/L、极板间距2 cm、初始废水p H 7.0的条件下,废水的COD、色度、NH3-N的去除率分别可达45.3%,66.9%,33.6%;BOD5/COD由处理前的0.27增至0.40,可生化性得到改善;COD、色度、NH3-N的电化学氧化降解过程均近似符合一级动力学方程;且该电化学体系的应用稳定性良好。 相似文献
87.
88.
89.
90.