全文获取类型
收费全文 | 4291篇 |
免费 | 70篇 |
国内免费 | 199篇 |
专业分类
安全科学 | 78篇 |
废物处理 | 99篇 |
环保管理 | 554篇 |
综合类 | 1010篇 |
基础理论 | 2012篇 |
污染及防治 | 356篇 |
评价与监测 | 119篇 |
社会与环境 | 222篇 |
灾害及防治 | 110篇 |
出版年
2021年 | 1篇 |
2018年 | 114篇 |
2017年 | 116篇 |
2016年 | 207篇 |
2015年 | 43篇 |
2014年 | 13篇 |
2013年 | 23篇 |
2012年 | 239篇 |
2011年 | 283篇 |
2010年 | 95篇 |
2009年 | 43篇 |
2008年 | 22篇 |
2007年 | 41篇 |
2006年 | 42篇 |
2005年 | 593篇 |
2004年 | 1009篇 |
2003年 | 819篇 |
2002年 | 123篇 |
2001年 | 62篇 |
2000年 | 55篇 |
1999年 | 95篇 |
1998年 | 59篇 |
1997年 | 132篇 |
1996年 | 41篇 |
1995年 | 35篇 |
1994年 | 37篇 |
1993年 | 72篇 |
1992年 | 58篇 |
1991年 | 51篇 |
1990年 | 6篇 |
1989年 | 16篇 |
1986年 | 1篇 |
1985年 | 2篇 |
1984年 | 1篇 |
1983年 | 2篇 |
1982年 | 7篇 |
1974年 | 1篇 |
1916年 | 1篇 |
排序方式: 共有4560条查询结果,搜索用时 15 毫秒
131.
Zhang Mingxi 《中国人口.资源与环境(英文版)》2011,9(2):84-89
Levying carbon tax is conducive to reducing carbon dioxide emissions and protecting the environment.The author firstly reviewed some relevant empirical studies on carbon tax both home and abroad,and then established the CGE model and simulated levying carbon tax in China.The study found that levying carbon tax would have little impact on China’s economy:in a short-term,China’s GDP might decrease by 0.51%,while in a long-term it might decrease by 0.08%;however,the carbon dioxide emissions would be substantially reduced.Meanwhile,levying carbon tax has some negative impact on the output of each industry in the very economic structure;of this,the mineral extractive industries would be influenced the most.Then the author summarized experience of levying carbon tax in foreign countries. 相似文献
132.
基于GIS与RUSLE的武陵山区小流域土壤侵蚀评价研究 总被引:1,自引:0,他引:1
以长江中下游武陵山区女儿寨小流域为研究区,基于数据观测积累及实地调查采样等方法,计算了研究区降雨侵蚀力、土壤可蚀性等因子,运用GIS与RUSLE评价了流域土壤侵蚀强度并分析了其与土地利用方式、海拔高度的关系。结果表明,流域平均土壤侵蚀强度为78844 t/(km2·a),属微度侵蚀,流域面积9518%的范围发生轻度以下的侵蚀,强烈以上侵蚀仅占1.19%。从土地利用类型来看,耕地、果园侵蚀强度较大,均达到中度侵蚀,有林地除竹林地为轻度侵蚀外均属微度侵蚀,耕地、果园、竹林地是今后水土流失防治的主要地类。不同海拔高度中,低海拔(200~400 m)区域侵蚀量占到流域侵蚀总量的6442%,是水土流失防治的重点地带。研究为应用修正通用土壤流失方程在武陵山区进行土壤侵蚀评价提供范例,为研究区防治土壤侵蚀和流域管理规划决策提供相应参考 相似文献
133.
刘向葵 《中国环境管理干部学院学报》1999,(4)
用城市生活垃圾经好氧高温制成堆肥,并向其中加入无机化肥和微量元素添加剂可制成有机复合肥。本文简要阐述了好氧高温堆肥的生产工艺,推荐了用垃圾生产有机复合肥的两类配方。 相似文献
134.
刘利柱 《中国环境管理干部学院学报》1999,(4)
实施可持续发展战略,就是要实现经济建设与环境保护协调发展。本文从佳木斯市实际出发,提出了环境保护职能部门如何参与经济结构调整以实现经济与环境协调发展的意见和建议。 相似文献
135.
本文在剖析绿色技术的概念内涵与特征的基础上,构建了由清洁生产技术、资源化技术、末端治理技术、生态农业技术、绿色食品技术、清洁消费技术与生态恢复技术等为主要内容的我国绿色技术体系,并从行政、经济、法律、教育及科研等五个方面阐述了促进我国可持续发展的绿色技术实施策略。 相似文献
136.
孙景民 《中国环境管理干部学院学报》1999,(3)
针对全国报刊治理整顿后多数学报由内部发行转为正式学报类期刊的新情况,本文从学报业务工作的几个方面对全面提高成人高校学报(以下简称“成高学报”)办刊质量进行了较详细的论述,旨在对成高学报的办刊工作起到一些促进作用。 相似文献
137.
刘华 《中国环境管理干部学院学报》1999,(1)
元代1264年定都燕京后,为加强政治统治,在中原先进的农耕经济影响下,改变过去“逐水草而居”游牧经济的生产方式,在积极保护动、植物资源和合理开发利用土地、水资源等方面,采取了一些恢复和发展农业生产的举措。剖璞见玉,对今仍有史鉴作用。 相似文献
138.
Hong?ZhengEmail author Yoshitaka?Nitta Isamu?Yokota 《Journal of Material Cycles and Waste Management》2004,6(2):153-161
In this article, the systems for the collection and intermediate processing of used beverage cans (UBCs) are compared and analyzed, focusing on the time taken and the cost of processing, the energy consumption, and the emissions of CO2, SO
x
, and NO
x
, during the process. We found that cases where the UBCs were crushed in the discharging process gave better results, and how the UBCs were collected was the most important factor. It was more desirable to treat UBCs in one place than in two places. When the transportation distance was longer, the pressed form of UBCs was more convenient. When the transportation distance was short, the original form, the crushed form, and the shredded form of UBCs were all suitable. That is, the contribution of the transportation process to the evaluation was large when the transport distance was long, and the contribution of the treatment process was large when the transport distance was short. 相似文献
139.
Utilization of red mud as catalyst in conversion of waste oil and waste plastics to fuel 总被引:4,自引:0,他引:4
A. Ihsan?Cakici Jale?YanikEmail author Suat?U?ar Tamer?Karayildirim Huseyin?Anil 《Journal of Material Cycles and Waste Management》2004,6(1):20-26
The aim of this study was to investigate the possibilities of using a by-product (red mud) from alumina production as a catalyst for recovery of waste. The conversion of waste mineral oil (WMO) and waste mineral oil/municipal waste plastic (WMO/MWP) blends over red mud (RM), a commercial hydrocracking catalyst (silica–alumina), and a commercial hydrotreating catalyst (Ni–Mo/alumina) to fuel has been studied. The effect of the catalyst and the temperature on the product distribution (gas, liquid, and wax) and the properties of liquid products were investigated. In the case of hydrotreatment of WMO, the liquids obtained over RM at both 400° and 425°C had larger amounts of low-boiling hydrocarbons than that of thermal or catalytic treatment with hydrotreating catalyst. Gas chromatography and nuclear magnetic resonance analysis of the liquid products showed that RM had hydrogenation and cracking activity in hydrotreatment of WMO. In coprocessing of WMO with municipal waste plastics, temperature had an important effect as well as the amount of MWP in the blend and the catalyst type. The hydrocracking at 400°C produced no liquid product. In hydrocracking at 425°C, the product distribution varied with catalyst type and MWP amount. The commercial hydrocracking catalyst had more cracking ability in the conversion of WMO/MWP to liquid and gas fuel than RM. In the case of hydrocracking over RM, the largest amount of liquid having satisfactory quality was obtained only from the blend containing 20% MWP. 相似文献
140.
Seung-Hwan?LeeEmail author Tsutomu?Ohkita 《Journal of Polymers and the Environment》2004,12(4):203-210
Ring-opening polymerization of cyclic esters (-caprolactone, -valerolactone, and l-lactide) onto liquefied biomass (LB) was conducted to obtain the polyester-type polyol and to regulate the characteristics of LB. IR and 1H-NMR spectra of the obtained polyol showed that the polymerization was successfully conducted in the presence of acid catalyst, which is used in liquefaction. The molecular weight (Mw), hydroxyl value, and viscosity were controllable by changing the reaction conditions. Polyester-type polyurethane foams with a wide range of properties were prepared from the obtained polyol with the appropriate combinations of foaming agents. 相似文献