全文获取类型
收费全文 | 3873篇 |
免费 | 320篇 |
国内免费 | 1621篇 |
专业分类
安全科学 | 411篇 |
废物处理 | 177篇 |
环保管理 | 294篇 |
综合类 | 2497篇 |
基础理论 | 677篇 |
环境理论 | 1篇 |
污染及防治 | 1155篇 |
评价与监测 | 198篇 |
社会与环境 | 190篇 |
灾害及防治 | 214篇 |
出版年
2024年 | 24篇 |
2023年 | 129篇 |
2022年 | 284篇 |
2021年 | 221篇 |
2020年 | 224篇 |
2019年 | 191篇 |
2018年 | 199篇 |
2017年 | 223篇 |
2016年 | 255篇 |
2015年 | 287篇 |
2014年 | 274篇 |
2013年 | 380篇 |
2012年 | 353篇 |
2011年 | 393篇 |
2010年 | 291篇 |
2009年 | 258篇 |
2008年 | 299篇 |
2007年 | 226篇 |
2006年 | 214篇 |
2005年 | 181篇 |
2004年 | 114篇 |
2003年 | 108篇 |
2002年 | 101篇 |
2001年 | 75篇 |
2000年 | 81篇 |
1999年 | 75篇 |
1998年 | 72篇 |
1997年 | 48篇 |
1996年 | 57篇 |
1995年 | 54篇 |
1994年 | 23篇 |
1993年 | 22篇 |
1992年 | 26篇 |
1991年 | 19篇 |
1990年 | 7篇 |
1989年 | 7篇 |
1988年 | 4篇 |
1987年 | 3篇 |
1986年 | 4篇 |
1984年 | 3篇 |
1982年 | 2篇 |
1981年 | 2篇 |
1975年 | 1篇 |
排序方式: 共有5814条查询结果,搜索用时 15 毫秒
91.
Shu Heping Ma Jinzhu Guo Jiabing Qi Shi Guo Zizheng Zhang Peng 《Environmental science and pollution research international》2020,27(30):37455-37467
Environmental Science and Pollution Research - Slope failure is a one of major process that causes severe landform variation and environment variation, and slope failure has become a major hidden... 相似文献
92.
Chen Yonglin Cui Jian Gong Yaqi Wei Shuang Wei Yuanyun Yi Lan 《Environmental science and pollution research international》2021,28(13):15584-15596
Environmental Science and Pollution Research - Ionizing radiation (IR) is a form of high energy. It poses a serious threat to organisms, but radiotherapy is a key therapeutic strategy for various... 相似文献
93.
Imidacloprid [1-(6-chloro-3-pyridylmethyl)-N-nitro-imidazolidin-2-ylideneamine] and RH-5849 [2'-benzoyl-l'-tert-butylbenzoylhydrazinel] are two pesticides used in China since 1992. In the present study we conducted acute toxicity test, micronucleus (MN) test and comet assay of the two pesticides on amphibian, Rana N. Hallowell, a sensitive organism suitable for acting as the bio-indicator of aquatic and agricultural ecosystems. The values of LC50-48 h of imidacloprid were found to be 165 mg l(-1) for tadpoles of Rana limnocharis and 219 mg l(-1) for tadpoles of Rana N. Hallowell. On the other hand, RH-5849 showed no acute toxicity to tadpoles during the 96 h exposure even it was saturated in the test solutions. There were significant differences in the MN frequencies between the negative controls and the treated groups at the dose of 8 mg l(-1) for imidacloprid (p < 0.05) and 40 mg l(-1) for RH-5849 (p < 0.01). Comet assay found significant differences (p < 0.01) in the distributions of DNA damage grades between the negative controls and groups treated in vitro with 0.05, 0.1, 0.2 and 0.5 mg l(-1) of imidacloprid and 5, 25, 50 and 100 mg l(-1) of RH-5849, respectively. DNA damage scores increased with the exposure levels of the two pesticides and dose-effect relationships were observed for both imidacloprid (r2 = 0.92) and RH-5849 (r2 = 0.98). The MN test and comet assay revealed potential adverse effects of the two pesticides on DNA in the erythrocytes of amphibians in aquatic and agricultural ecosystems. 相似文献
94.
95.
综述了USB反应器进行生物反硝化的历史沿革、研究现状 ,并对其在研究中存在的问题进行了描述。最后 ,对USB反应器进行生物反硝化的应用前景作了科学的分析 相似文献
96.
97.
Distribution and bioavailability of ceria nanoparticles in an aquatic ecosystem model 总被引:1,自引:0,他引:1
Along with the increasing utilization of engineered nanoparticles, there is a growing concern for the potential environmental and health effects of exposure to these newly designed materials. Understanding the behavior of nanoparticles in the environment is a basic need. The present study aims to investigate the distribution and fate of ceria nanoparticles in an aquatic system model which consists of sediments, water, hornworts, fish and snails, using a radiotracer technique. Concentrations of ceria in the samples at regular time intervals were measured. Ceria nanoparticles were readily removed from the water column and partitioned between different organisms. Both snail and fish have fast absorption and clearance abilities. Hornwort has the highest bioaccumulation factors. At the end of the experiment, sediments accumulated most of the nanoparticles with a recovery of 75.7 ± 27.3% of total ceria nanoparticles, suggesting that sediments are major sinks of ceria nanoparticles. 相似文献
98.
99.
100.
环境风险防控与环境风险源管理是我国当前环境管理的重要工作之一。为了防控重大环境污染事件、实现环境风险源有序管理、科学决策,开展了重大环境污染事件风险源识别监控与管理技术的研发创新。借鉴国外环境风险源管理经验,遵循环境风险源“分类、分级、分区”管理原则,研发了环境风险源分类、识别与定量分级方法,实现了典型化工园区、特大城市及全国尺度的环境风险源分级,初步提出了全国石化化工行业重点风险企业名单。开发了环境风险源综合管理系统,以期为重点风险源监管、环境风险防控提供技术支持。 相似文献