全文获取类型
收费全文 | 4368篇 |
免费 | 446篇 |
国内免费 | 1571篇 |
专业分类
安全科学 | 403篇 |
废物处理 | 222篇 |
环保管理 | 344篇 |
综合类 | 2976篇 |
基础理论 | 685篇 |
环境理论 | 2篇 |
污染及防治 | 1067篇 |
评价与监测 | 256篇 |
社会与环境 | 214篇 |
灾害及防治 | 216篇 |
出版年
2024年 | 14篇 |
2023年 | 103篇 |
2022年 | 263篇 |
2021年 | 274篇 |
2020年 | 217篇 |
2019年 | 180篇 |
2018年 | 173篇 |
2017年 | 234篇 |
2016年 | 218篇 |
2015年 | 260篇 |
2014年 | 319篇 |
2013年 | 367篇 |
2012年 | 379篇 |
2011年 | 434篇 |
2010年 | 355篇 |
2009年 | 331篇 |
2008年 | 350篇 |
2007年 | 277篇 |
2006年 | 265篇 |
2005年 | 176篇 |
2004年 | 143篇 |
2003年 | 124篇 |
2002年 | 120篇 |
2001年 | 92篇 |
2000年 | 105篇 |
1999年 | 101篇 |
1998年 | 83篇 |
1997年 | 85篇 |
1996年 | 67篇 |
1995年 | 65篇 |
1994年 | 43篇 |
1993年 | 51篇 |
1992年 | 24篇 |
1991年 | 20篇 |
1990年 | 16篇 |
1989年 | 6篇 |
1988年 | 12篇 |
1987年 | 11篇 |
1986年 | 5篇 |
1985年 | 5篇 |
1984年 | 4篇 |
1983年 | 1篇 |
1982年 | 4篇 |
1981年 | 5篇 |
1980年 | 1篇 |
1978年 | 2篇 |
1930年 | 1篇 |
排序方式: 共有6385条查询结果,搜索用时 359 毫秒
1.
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
2.
Fu Li Chen Yi Yang Xinyi Yang Zuyao Liu Sha Pei Lei Feng Baixiang Cao Ganxiang Liu Xin Lin Hualiang Li Xing Ye Yufeng Zhang Bo Sun Jiufeng Xu Xiaojun Liu Tao Ma Wenjun 《Environmental science and pollution research international》2019,26(20):20137-20147
Environmental Science and Pollution Research - Fetal growth has been demonstrated to be an important predictor of perinatal and postnatal health. Although the effects of maternal exposure to air... 相似文献
3.
湖泊富营养化与氮、磷及有机物含量过高密切相关,建立数字型营养物基准能够防止富营养化对水体指定用途造成影响.太湖流域是我国华东地区经济腹地,近年来流域内湖泊水质每况愈下,对其基准研究可为湖泊治理提供依据.详细介绍了压力响应关系法制定湖泊营养物基准的步骤,并将此方法运用到太湖流域营养物基准制定研究中.为满足大多数水体指定用途,研究中将该流域湖泊基本功能确定为娱乐、永生生物栖息地及饮用水,以此构建流域概念模型.选择压力变量为总氮(TN)、总磷(TP)和有机物,响应变量为叶绿素a(chl-a).用非参数分析法和线性回归法分别建立压力-响应模型,通过2种方法相互验证得到TN、TP和CODMn基准分别为0.593、0.067和4.092 mg/L. 相似文献
4.
5.
以三聚氰胺为前驱体,经热解—回流法制备了石墨相氮化碳(g-C3N4),采用XRD、FTIR、SEM、EDS、PL等技术对g-C_3N_4进行了表征。研究了g-C_3N_4在UV-H_2O_2体系中对废水中亚甲基蓝(MB)的光降解效果。实验结果表明,UV+g-C_3N_4催化剂+H_2O_2体系能协同降解MB,在初始MB质量浓度为20 mg/L、初始废水p H为5、废水体积为250 mL、g-C_3N_4加入量为0.10 g、H_2O_2浓度为0.4 mmol/L、反应温度为25℃的优化工艺条件下,紫外光照射70 min时MB脱色率达98.32%。g-C_3N_4催化剂具有较好的重复使用性能,使用5次后MB脱色率仍保持在95.10%。 相似文献
6.
7.
8.
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
9.
10.
The ageing effect on the bioaccessibility and fractionation of arsenic in soils from China 总被引:7,自引:0,他引:7
Ingestion of contaminated soil has been recognized as an important exposure pathway of arsenic for humans, especially for children through outdoor hand-to-mouth activities. An improved sequential extraction procedure was employed in an attempt to reveal the relationship between bioaccessibility and fractionation of As in five soils from China. Arsenic bioaccessibility in acidic ( approximately pH 4.5) soils reached approximately stable levels after a sharp decline within one week of ageing. In contrast, As bioaccessibility in higher pH (>6.0) soils was found to be significantly higher and took two weeks of ageing to reach stable levels. The artificially added As was more labile than indigenous As. The main proportions of added As were found in the specifically sorbed and amorphous and poorly-crystalline hydrous Fe/Al oxide-bound fractions. Correlation analysis shows that the non-specifically and specifically sorbed As are likely to constitute the main proportion of bioaccessible soil As. The soil content of amorphous and crystalline Fe/Al oxides and soil pH appear to be the key factors controlling, not only the time needed to reach a steady state, but also the magnitude of the bioaccessibility of As added to the soils. 相似文献