全文获取类型
收费全文 | 314篇 |
免费 | 14篇 |
国内免费 | 125篇 |
专业分类
安全科学 | 11篇 |
废物处理 | 23篇 |
环保管理 | 33篇 |
综合类 | 202篇 |
基础理论 | 46篇 |
污染及防治 | 99篇 |
评价与监测 | 11篇 |
社会与环境 | 12篇 |
灾害及防治 | 16篇 |
出版年
2023年 | 5篇 |
2022年 | 19篇 |
2021年 | 16篇 |
2020年 | 12篇 |
2019年 | 7篇 |
2018年 | 16篇 |
2017年 | 16篇 |
2016年 | 9篇 |
2015年 | 20篇 |
2014年 | 26篇 |
2013年 | 41篇 |
2012年 | 39篇 |
2011年 | 23篇 |
2010年 | 21篇 |
2009年 | 35篇 |
2008年 | 20篇 |
2007年 | 16篇 |
2006年 | 22篇 |
2005年 | 8篇 |
2004年 | 6篇 |
2003年 | 9篇 |
2002年 | 14篇 |
2001年 | 6篇 |
2000年 | 8篇 |
1999年 | 7篇 |
1998年 | 4篇 |
1997年 | 4篇 |
1996年 | 8篇 |
1995年 | 1篇 |
1994年 | 3篇 |
1993年 | 2篇 |
1991年 | 1篇 |
1990年 | 1篇 |
1989年 | 4篇 |
1986年 | 3篇 |
1983年 | 1篇 |
排序方式: 共有453条查询结果,搜索用时 265 毫秒
301.
对海外油气钻井工程项目及其特点进行了分析,提出了加强海外油气钻井工程项目HSSE管理的对策及建议。 相似文献
302.
Zefeng Zhang Jing Shang Tong Zhu Hongjun Li Defeng Zhao Yingju Liu Chunxiang Ye 《环境科学学报(英文版)》2012,24(10):1753-1758
The studies on heterogeneous reactions over montmorillonite, which is a typical 2:1 layered aluminosilicate, will benefit to the understanding of heterogeneous reactions on clay minerals. Montmorillonite can be classified as sodium montmorillonite or calcium montmorillonite depending on the cation presented between the different layers. Using diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS), the heterogeneous reaction mechanism of NO2 on the surface of montmorillonite was firstly investigated. Results showed that the reaction of NO2 on the surface of sodium and calcium montmorillonite fit a first-order kinetics, and the reaction duration of calcium montmorillonite was longer than that of sodium montmorillonite under the dry condition. For either sodium or calcium montmorillonite, the uptake coefficient decreased as humidity increased. 相似文献
303.
笔者通过对国内公路声屏障产品质量的关注,深入剖析产生产品质量问题的内在原因及外部环境。提出建立公路声屏障产品质量控制体系的思路与实施方法,供大家一起探讨和完善。 相似文献
304.
近几年,我国钢铁工业发展很快,但是,钢铁产业长期粗放发展积累的矛盾日益突出。除了产能过剩、产业集中度低、创新能力不强、资源控制力弱等问题外,更为突出的矛盾是钢厂的发展越来越受到环境容量、能源资源等因素的严重制约。如何颠覆传统的"高耗能、高污染"发展方式,走出一条钢厂和谐发展的绿色之路,是实现可持续发展所面临的重大难题。 相似文献
305.
306.
307.
用三氯甲烷萃取水中的四乙基铅,直接在石墨炉原子吸收仪上进行测定。结果表明:本方法的相对标准偏差为5.9%,平均回收率在90.4%~108%之间,检出限为1.3×10^-5mg/L,准确度高,精密度好。 相似文献
308.
Seasonal variation of potential denitrification rates of surface sediment from
Meiliang Bay, Taihu Lake, China 总被引:7,自引:0,他引:7
Jicheng Zhong Chengxin Fan Guofeng Liu Lei Zhang Jingge Shang Xiaozhi Gu 《环境科学学报(英文版)》2010,22(7):961-967
The regulatory effects of environmental factors on denitrification were studied in the sediments of Meiliang Bay, Taihu Lake, in a monthly sampling campaign over a one-year period. Denitrification rates were measured in slurries of field samples and enrichment experiments using the acetylene inhibition technique. Sediment denitrification rates in inner bay and outer bay ranged from 2.8 to 51.5 nmol N2/(g dw (dry weight)·hr) and from 1.5 to 81.1 nmol N2/(g dw·hr), respectively. Sediment denitrification rates were greatest in the spring and lowest in the summer and early autumn, due primarily to seasonal differences in nitrate concentration and water temperature. For each site, positive and linear relationships were regularly observed between denitrification rate and water columnn itrate concentration. Of various environmental factors on denitrification that we assessed, nitrate was determined to be the key factor limiting denitrification rates in the sediments of Meiliang Bay. In addition, at the two sites denitrification rates were also regulated by temperature. The addition of organic substrates had no significant effect on denitrification rate, indicating that sediment denitrification was not limited by organic carbon availability in the sediments. Nitrate in the water column was depleted during summer and early autumn, and this suppressed effective removal of nitrogen from Taihu Lake by denitrification. 相似文献
309.
Zhongbin Lu Zhiguang Hou Xiumei Wang Siwei Wang Yanyan Shang Xing Yuan 《环境科学学报(英文版)》2010,22(11):1774-1778
HW-02 is a new organophosphates herbicide which is discovered and developed in China. The kinetics and mechanism of HW- 02 photodegradation in the organic solvents were studied at 25°C under the irradiation of ultraviolet light. The results showed that photochemical reaction of HW-02 in organic solvents such as n-hexane, methanol, dimethyl benzene and acetone under UV light could be well described by the first kinetic equation, and the photodegradation efficiency decreased with a order of n-hexane methanol xylene acetone. The photodegradation efficiency constant of HW-02 in n-hexane, methanol, xylene and acetone were 4.951 × 10 2 , 3.253 × 10 2 , 2.377 × 10 2 and 1.628 × 10 2 min 1 , and the corresponding half-lives were 13.99, 21.20, 29.15 and 42.56 min, respectively. By separation and identification of photoproducts using GC-MS, it could be concluded that HW-02 was photolyzed through ester cleavage, photo-dechlorination and photoisomerization of the molecule itself. 相似文献
310.
介绍了PID检测技术原理、特点,及在重油输送装置的对比试验,结果表明,PID比催化燃烧式可燃气体检测仪灵敏度高。 相似文献