全文获取类型
收费全文 | 152篇 |
免费 | 15篇 |
国内免费 | 32篇 |
专业分类
安全科学 | 5篇 |
废物处理 | 53篇 |
环保管理 | 17篇 |
综合类 | 88篇 |
基础理论 | 18篇 |
环境理论 | 2篇 |
污染及防治 | 12篇 |
评价与监测 | 2篇 |
社会与环境 | 2篇 |
出版年
2024年 | 2篇 |
2023年 | 4篇 |
2022年 | 4篇 |
2021年 | 4篇 |
2020年 | 9篇 |
2019年 | 6篇 |
2018年 | 3篇 |
2017年 | 2篇 |
2016年 | 7篇 |
2015年 | 6篇 |
2014年 | 16篇 |
2013年 | 10篇 |
2012年 | 5篇 |
2011年 | 5篇 |
2010年 | 5篇 |
2009年 | 9篇 |
2008年 | 7篇 |
2007年 | 4篇 |
2006年 | 4篇 |
2005年 | 7篇 |
2004年 | 7篇 |
2003年 | 14篇 |
2002年 | 7篇 |
2001年 | 11篇 |
2000年 | 11篇 |
1999年 | 6篇 |
1998年 | 7篇 |
1997年 | 3篇 |
1996年 | 4篇 |
1995年 | 3篇 |
1994年 | 3篇 |
1993年 | 4篇 |
排序方式: 共有199条查询结果,搜索用时 671 毫秒
171.
The floatability of seven plastics (POM, PVC, PET, PMMA, PC, PS and ABS) in the presence of methyl cellulose (MC) and separation of plastics mixtures were investigated in this paper. It was found that the seven plastics can be separated into three groups by using the wetting agent MC. Group one includes POM and PVC. They are depressed at very low MC concentrations. Group two, including PET, PMMA and PC, has an intermediate floatability. Group three (ABS and PS) has a high floatability. They are almost not depressed within the given MC concentration range. In order to understand the mechanism of selective flotation of plastics and the chemical conditioning process, surface chemical factors, such as wettability of plastics and surface tension of flotation medium, and gravity factors, such as particle density and shape, were studied. It was found that the depressing effect of MC on plastics is ascribed mainly to its adsorption on the plastics surfaces. The MC molecules absorbed on plastics expose some of their polar groups oriented towards the aqueous phase, hence making the plastics surfaces hydrophilic. In addition, flotation selectivity for the plastics is dominated not only by wettability of plastics, but also by particle size, density and shape. 相似文献
172.
173.
本文探讨了交联剂甲醛、乙醛、乙二醛、Cu^2+、Fe^3+、Zn^2+、Mg^2+对交联S-P膜耐水性能的影响。实验结果表明:经Fe^2+,乙二醛交联的S-P膜,其耐水性能优于其它膜。 相似文献
174.
175.
TBP-泡塑填料柱萃取回收铁钍渣浸出液中钍的研究 总被引:1,自引:0,他引:1
将TBP固定在改性泡塑载体上,用于萃取回收铁钍渣硝酸浸出液中Th4+。试验表明:TBP泡塑填料萃取分配比高,萃取容量大,当溶液硝酸浓度为4mol/L,接触时间10min时,萃余液中Th4+浓度小于001mg/L,反萃液中Th3+浓度达84g/L,Fe3+和Ce3+浓度小于01mg/L,萃取容量为TBP泡塑填料1g可萃取Th4+028g;TBP泡塑填料化学性质稳定,分相容易,能有效防止乳化现象。 相似文献
176.
A summary of environmental legislation targeting disposable diapers and review of related literature
Patricia Cox Crews Wendelin Rich Shirley Niemeyer 《Journal of Polymers and the Environment》1994,2(1):39-48
In recent years state and local governments, as well as private citizens, have become very concerned about the mounting solid waste disposal problem facing our nation. Special concern has been expressed over the presence of disposable diapers in the solid waste stream. Responding to the concerns, legislators in at least 25 states proposed actions regarding disposable diapers between 1990 and 1992. Several factors contributed to the number of legislative proposals regarding disposable diapers over the past few years. First was the public's and legislators' misconception about the contribution of disposable diapers to the solid waste stream. Second was an erroneous assumption held by the public and some legislators that biodegradation readily occurs in landfills. Third was the desire to increase demand for agricultural products by requiring the use of degradable products. These contributing factors and other issues surrounding the proposal and passage of environmental legislation pertaining to disposable diapers are presented in this paper and the relevant literature is summarized. To provide the necessary context, the paper contains a review of the literature concerning disposable diapers, their composition and usage; and their environmental impact and fate and a comparison of their performance and cost to those of cloth diapers. 相似文献
177.
高技术再资源化是根治“白色污染”的主要方向 总被引:2,自引:0,他引:2
针对“白色污染”日益严重的现状,对现有的“白色污染”防治对策和技术进行了分析探讨,指出简单的技术已不适用,可降解的发展尚需时日,而废塑料再资源化技术才是根治“白色污染”的主要方向。 相似文献
178.
废弃塑料裂解油化技术 总被引:2,自引:0,他引:2
综述了废弃塑料进行热裂解和催化裂解以获得聚合单体、柴油、汽油和燃料气的工艺原理、工艺流程和常用的裂解催化剂。指出裂解油化技术是今后处理废弃塑料的主要方式之一。 相似文献
179.
将TBP固定在改性泡塑载体上,用于萃取回收铁钍渣硝酸浸出液中Th4+。试验表明:TBP泡塑填料萃取分配比高,萃取容量大,当溶液硝酸浓度为4mol/L,接触时间10min时,萃余液中Th4+浓度小于001mg/L,反萃液中Th3+浓度达84g/L,Fe3+和Ce3+浓度小于01mg/L,萃取容量为TBP泡塑填料1g可萃取Th4+028g;TBP泡塑填料化学性质稳定,分相容易,能有效防止乳化现象。 相似文献
180.