全文获取类型
收费全文 | 598篇 |
免费 | 94篇 |
国内免费 | 172篇 |
专业分类
安全科学 | 39篇 |
废物处理 | 23篇 |
环保管理 | 83篇 |
综合类 | 387篇 |
基础理论 | 179篇 |
污染及防治 | 97篇 |
评价与监测 | 27篇 |
社会与环境 | 23篇 |
灾害及防治 | 6篇 |
出版年
2024年 | 4篇 |
2023年 | 19篇 |
2022年 | 11篇 |
2021年 | 24篇 |
2020年 | 21篇 |
2019年 | 31篇 |
2018年 | 20篇 |
2017年 | 28篇 |
2016年 | 24篇 |
2015年 | 35篇 |
2014年 | 35篇 |
2013年 | 48篇 |
2012年 | 54篇 |
2011年 | 62篇 |
2010年 | 49篇 |
2009年 | 48篇 |
2008年 | 41篇 |
2007年 | 49篇 |
2006年 | 32篇 |
2005年 | 21篇 |
2004年 | 24篇 |
2003年 | 29篇 |
2002年 | 24篇 |
2001年 | 16篇 |
2000年 | 17篇 |
1999年 | 17篇 |
1998年 | 19篇 |
1997年 | 11篇 |
1996年 | 6篇 |
1995年 | 8篇 |
1994年 | 10篇 |
1993年 | 4篇 |
1992年 | 2篇 |
1991年 | 1篇 |
1990年 | 1篇 |
1989年 | 1篇 |
1987年 | 2篇 |
1986年 | 1篇 |
1983年 | 1篇 |
1982年 | 1篇 |
1981年 | 3篇 |
1980年 | 1篇 |
1979年 | 1篇 |
1978年 | 1篇 |
1977年 | 2篇 |
1975年 | 2篇 |
1972年 | 2篇 |
1970年 | 1篇 |
排序方式: 共有864条查询结果,搜索用时 281 毫秒
831.
832.
介绍了石油、天然气地下盐穴存储的特点,分析了石油、天然气地下盐穴存储的典型事故:井喷和泄漏事故,并提出应对措施。 相似文献
833.
834.
膜蒸馏是将膜与蒸馏过程相结合的分离方法,是一种节能高效的分离技术。本文从其过程机理出发,展望了该技术在苦咸水淡化技术中应用的前景。 相似文献
835.
836.
张慧娟 《辽宁城乡环境科技》2010,(1):75-76
针对北方城市冬季普遍使用融雪剂来融化道路上的积雪、有效改善雪后道路交通状况,但同时也带来了一系列的环境污染问题的现状,依据相关资料,并结合丹东市具体情况,对使用融雪剂除雪给环境带来的危害进行分析,并提出对策建议。 相似文献
837.
Size, composition, and mixing state of individual aerosol particles
in a South China coastal city 总被引:1,自引:0,他引:1
Weijun Li Longyi Shao Zhishi Wang Rongrong Shen Shusheng Yang Uwa Tang 《环境科学学报(英文版)》2010,22(4):561-569
Aerosol samples were collected in summer in Macao,a coastal city of the Pearl River Delta Region in China.Morphology,size,elemental composition,and mixing state of individual aerosol particles were determined by scanning electron microscopy coupled energy dispersive X-ray(SEM/EDX) and transmission electron microscopy(TEM).Based on the morphologies of 5711 aerosol particles,they consist of soot(32%),mineral(17%),secondary(22%),and unknown fine particles(29%).The sizes of these particles were mostly distributed between 0.1 and 0.4 μm.Compositions of 202 mineral particles were obtained by SEM/EDX.Mineral particles were mainly classified into three types:Si-rich,Ca-rich,and Na-rich.The compositions of typical mineral particles can indicate their sources in sampling location.For example,mineral particles,collected along the main street,were associated with trace amounts of heavy metals,such as Zn,Ti,Mn,Ba,Pb,and As.TEM observations indicate that most Na-rich particles were aged sea salt particles(e.g.,Na2SO4 and NaNO3) which formed through heterogeneous chemical reactions between sea salt and acidic gases.Additionally,aging time of soot was short in Macao due to high humidity,high temperature,and high levels of sunlight in Macao.Most of soot and fine mineral dust particles were internally mixed with secondary particles. 相似文献
838.
The Mojave Desert is characterized by hot dry summers and cold winters. The red-spotted toad (Bufo (Anaxyrus) punctatus) is the predominant anuran species; yet little is known of their thermal histories and strategies to avoid temperature extremes. We measured body temperature (T(b)) in free-ranging adult toads across all four seasons of a year using implanted data loggers. There is marked individual variation in the temperatures experienced by these toads. As expected, toads generally escape extreme seasonal and diel temperature fluctuations. However, our data demonstrate a much wider estimated T(b) range than was previously assumed. Though often for short periods, red-spotted toads do experience T(b) as low as 3.1 degrees C and as high as 39.1 degrees C. All animals showed periods of prolonged thermal stability in cooler months and wider diel oscillations in warmer months. Red-spotted toad thermal history is likely a function of site choice; the exploitation of different refuges results in diverse thermal experiences. These data represent the most complete record of thermal experiences for a desert anuran and reveal greater extremes in body temperature than previously suggested. 相似文献
839.
840.