全文获取类型
收费全文 | 184篇 |
免费 | 13篇 |
国内免费 | 60篇 |
专业分类
安全科学 | 54篇 |
废物处理 | 2篇 |
环保管理 | 21篇 |
综合类 | 134篇 |
基础理论 | 19篇 |
污染及防治 | 6篇 |
评价与监测 | 9篇 |
灾害及防治 | 12篇 |
出版年
2024年 | 1篇 |
2023年 | 2篇 |
2022年 | 4篇 |
2021年 | 4篇 |
2020年 | 7篇 |
2019年 | 10篇 |
2018年 | 1篇 |
2017年 | 6篇 |
2016年 | 7篇 |
2015年 | 7篇 |
2014年 | 34篇 |
2013年 | 22篇 |
2012年 | 16篇 |
2011年 | 27篇 |
2010年 | 19篇 |
2009年 | 17篇 |
2008年 | 12篇 |
2007年 | 15篇 |
2006年 | 13篇 |
2005年 | 9篇 |
2004年 | 2篇 |
2003年 | 4篇 |
2002年 | 1篇 |
2001年 | 4篇 |
2000年 | 2篇 |
1998年 | 2篇 |
1997年 | 3篇 |
1996年 | 1篇 |
1995年 | 2篇 |
1993年 | 2篇 |
1992年 | 1篇 |
排序方式: 共有257条查询结果,搜索用时 15 毫秒
101.
102.
本文以LEEMAN中阶梯光栅ICP光谱仪为倒,介绍了新一代中阶梯ICP扫描光谱仪的结构、原理、性能及其特点。同时介绍了ICP光谱仪在环境分析中的初步应用。 相似文献
103.
The article investigated the adsorption of Hg(II) on Macrocystis pyrifera and Undaria pinnatifida in monometallic system and in the presence of Zn(II), Cd(II) and Ni(II). 相似文献
104.
Moisture distributions in municipal sewage sludge, printing and dyeing sludge and paper mill sludge were experimentally studied
based on four di erent methods, i.e., drying test, thermogravimetric-di erential thermal analysis (TG-DTA) test, thermogravimetricdi
erential scanning calorimetry (TG-DSC) test and water activity test. The results indicated that the moistures in the mechanically
dewatered sludges were interstitial water, surface water and bound water. The interstitial water accounted for more than 50% wet basis
(wb) of the total moisture content. The bond strength of sludge moisture increased with decreasing moisture content, especially when
the moisture content was lower than 50% wb. Furthermore, the comparison among the four di erent testing methods was presented.
The drying test was advantaged by its ability to quantify free water, interstitial water, surface water and bound water; while TG-DSC
test, TG-DTA test and water activity test were capable of determining the bond strength of moisture in sludge. It was found that the
results from TG-DSC and TG-DTA test are more persuasive than water activity test. 相似文献
105.
106.
107.
108.
Jing REN Nan LI Lin ZHAO Nanqi REN 《Frontiers of Environmental Science & Engineering》2014,8(4):531-538
Ferric oxyhydroxide loaded anion exchanger (FOAE) hybrid adsorbent was prepared by loading nanosized ferric oxyhydroxide (FO) on anion exchanger resin for the removal of phosphate from wastewater. TEM and XRD analysis confirmed the existence of FO on FOAE. After FO loading, the adsorption capacity of the hybrid adsorbent increased from 38.70 to 51.52mg.g-1. Adsorption processes for both FOAE and anion resin were better fit to the pseudo first order model. Batch adsorption experiments revealed that higher temperature (313K), higher initial phosphate concentration (50 mg.L-1) and lower solution pH (pH value of 2) would be more propitious to phosphate adsorption. Competition effect of coexisting anions on phosphate removal can be concluded as sulfate 〉 nitrate 〉 chloride. Freundlich isotherm model can describe the adsorption of phosphate on FOAE more accurately, which indicated the heterogeneous adsorption occurred on the inner-surface of FOAE. 相似文献
109.
Zongcheng Zhan Xiaojun Liu Dongzhu Ma Liyun Song Jinzhou Li Hong He Hongxing Dai 《Frontiers of Environmental Science & Engineering》2014,8(4):483-495
A novel Ultrasonic Assisted Membrane Reduction (UAMR)-hydrothermal method was used to prepare flower-like Pt/CeO2 catalysts. The texture, physical/chemical properties, and reducibility of the flower-like Pt/CeO2 catalysts were characterized by X-Ray Diffraction (XRD), Scanning Electron Microscope (SEM), Transmission Electron Microscope (TEM), N2 adsorption, and hydrogen temperature programmed reduction (HE-TPR) techniques. The catalytic performance of the catalysts for treating automobile emission was studied relative to samples prepared by the conventional wetness impregnation method. The Pt/CeO2 catalysts fabricated by this novel method showed high specific surface area and metal dispersion, excellent three-way catalytic activity, and good thermal stability. The strong interaction between the Pt nanoparticles and CeO2 improved the thermal stability. The Ce4+ ions were incorporated into the surfactant chains and the Pt nanoparticles were stabilized through an exchange reaction of the surface hydroxyl groups. The SEM results demonstrated that the Pt/CeO2 catalysts had a typical three-dimensional (3D) hierarchical porous struc- ture, which was favorable for surface reaction and enhanced the exposure degree of the Pt nanoparticles. In brief, the flower-like Pt/CeO2 catalysts prepared by UAMR-hydrothermal method exhibited a higher Pt metal dispersion, smaller particle size, better three-way catalytic activity, and improved thermal stability versus conven- tional materials. 相似文献
110.