全文获取类型
收费全文 | 1208篇 |
免费 | 75篇 |
国内免费 | 366篇 |
专业分类
安全科学 | 86篇 |
废物处理 | 70篇 |
环保管理 | 88篇 |
综合类 | 683篇 |
基础理论 | 178篇 |
环境理论 | 1篇 |
污染及防治 | 401篇 |
评价与监测 | 54篇 |
社会与环境 | 52篇 |
灾害及防治 | 36篇 |
出版年
2023年 | 26篇 |
2022年 | 84篇 |
2021年 | 73篇 |
2020年 | 53篇 |
2019年 | 36篇 |
2018年 | 42篇 |
2017年 | 67篇 |
2016年 | 53篇 |
2015年 | 67篇 |
2014年 | 102篇 |
2013年 | 138篇 |
2012年 | 107篇 |
2011年 | 105篇 |
2010年 | 86篇 |
2009年 | 63篇 |
2008年 | 87篇 |
2007年 | 60篇 |
2006年 | 56篇 |
2005年 | 34篇 |
2004年 | 30篇 |
2003年 | 32篇 |
2002年 | 32篇 |
2001年 | 30篇 |
2000年 | 32篇 |
1999年 | 28篇 |
1998年 | 21篇 |
1997年 | 22篇 |
1996年 | 17篇 |
1995年 | 16篇 |
1994年 | 13篇 |
1993年 | 17篇 |
1992年 | 5篇 |
1991年 | 4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1649条查询结果,搜索用时 15 毫秒
61.
生态环境变化遥感评价指数的应用研究——以敖江流域为例 总被引:1,自引:0,他引:1
利用1994年5月12日与2009年6月6日的Landsat TM和2001年5月23日的Landsat ETM+卫星影像,选用遥感生态指数(RSEI),结合流域的植被覆盖度状况,定量评价了15年间敖江流域的生态环境变化与植被覆盖度变化情况,并对二者的关系进行了简要分析.结果表明:15年间,敖江流域生态等级为优所占的面积比例从13.48%上升到24.90%,增加了304.29 km2;植被覆盖度等级为极高的面积增加比例为29.31%.总体看来,敖江流域生态环境状况和植被覆盖状况均有明显的提高,两者具有较好的对应关系. 相似文献
62.
63.
64.
65.
Xu Bentuo Wu Minghong Pan Chenyuan Sun Yan Yuan Debao Tang Liang Xu Gang 《Environmental science and pollution research international》2017,24(16):14409-14416
Environmental Science and Pollution Research - Hydroxylated polyhalodiphenyl ethers (HO-PXDEs) have attracted considerable scientific interest as examples of emerging aquatic pollutants. However, a... 相似文献
66.
The effect and mechanism of inorganic carbon (IC) on the biodegradation of dimethyl phthalate (DMP) by a green microalga Closterium lunula was investigated. The growth of this microalga and the biodegradation of DMP were significantly enhanced when the initial IC was increased. An intermediate product of DMP biodegradation was identified as phthalic acid (PA) that was accumulated and caused a sharp decrease in pH of microalgal culture medium, which inhibited both the growth of microalga and the biodegradation of DMP. A suggested second-order kinetic equation of organic pollutant biodegradation by microalgae (-dC/dt = kNr) fitted well with the experimental data. The increase of IC caused a decline in biodegradation rate constant for organic carbon (k) and an increase in growth (N) by supplying a favorite carbon source and mitigating the decrease of pH. As the net effect, the overall biodegradation rate of DMP was promoted as IC increased, which was dominated by the increase of microalgal growth. 相似文献
67.
Rapid degradation of butachlor in wheat rhizosphere soil 总被引:16,自引:0,他引:16
The degradative characteristics of butachlor in non-rhizosphere, wheat rhizosphere, and inoculated rhizosphere soils were measured. The rate constants for the degradation of butachlor in non-rhizosphere, rhizosphere, and inoculated rhizosphere soils were measured to be 0.0385, 0.0902, 0.1091 at 1 mg/kg, 0.0348, 0.0629, 0.2355 at 10 mg/kg, and 0.0299, 0.0386, 0.0642 at 100 mg/kg, respectively. The corresponding half-lives for butachlor in the soils were calculated to be 18.0, 7.7, 6.3 days at 1 mg/kg, 19.9, 11.0, 2.9 days at 10 mg/kg, and 23.2, 18.0, 10.8 days at 100 mg/kg, respectively. The experimental results show that the degradation of butachlor can be enhanced greatly in wheat rhizosphere, and especially in the rhizosphere inoculated with the bacterial community designated HD which is capable of degrading butachlor. It could be concluded that rhizosphere soil inoculated with microorganisms-degrading target herbicides is a useful pathway to achieve rapid degradation of the herbicides in soil. 相似文献
68.
69.
ADAM暖体假人(Advanced Thermal Manikin)是当今世界上最先进的热能测试人体舒适度模型。是热能测试人体模型技术上的一个飞跃。ADAM是由美国国家可再生资源实验室和美国西北测试科技公司(MTNW)共同研制的,用来精确检测车辆和航行器内短时间的环境变化。ADAM有126个独立的发汗区,可以高度精确地模拟人在不同环境气候条件下的感觉和舒适度,以及人体的各种反应,如出汗、呼吸等等。 相似文献
70.
The discovery of cell-free DNA (cfDNA) in maternal plasma has opened up new promises for the development of non-invasive prenatal testing (NIPT). Application of cfDNA in NIPT of fetus diseases and abnormalities is restricted by the low amount of fetal DNA molecules in maternal plasma. Fetus-derived cfDNA in maternal plasma are shorter than maternal DNA, thus leveraging the maternal and fetus-derived cfDNA molecules size difference has become a novel and more accurate method for NIPT. However, multiple biological properties such as size distribution of plasma DNA, proportion of fetal-derived DNA and methylation levels in maternal plasma across different gestational ages still remain largely unknown. Further insights into the size distribution and fragmentation pattern of circulating plasma cfDNA will shed light on the origin and fragmentation mechanisms of cfDNA during physiological and pathological processes in prenatal diseases and enhance our ability to take the advantage of plasma cfDNA as a molecular diagnostic tool. In the review, we start by summarizing the research techniques for the determination of the fragmentation profiles of cfDNA in maternal plasma. We then summarize the main progress and findings in size profiles of maternal plasma cfDNA and cffDNA. Finally, we discuss the potential diagnostic applications of plasma cfDNA size profiling. 相似文献