全文获取类型
收费全文 | 1159篇 |
免费 | 71篇 |
国内免费 | 447篇 |
专业分类
安全科学 | 88篇 |
废物处理 | 80篇 |
环保管理 | 64篇 |
综合类 | 609篇 |
基础理论 | 224篇 |
污染及防治 | 494篇 |
评价与监测 | 48篇 |
社会与环境 | 28篇 |
灾害及防治 | 42篇 |
出版年
2023年 | 18篇 |
2022年 | 64篇 |
2021年 | 47篇 |
2020年 | 57篇 |
2019年 | 30篇 |
2018年 | 56篇 |
2017年 | 72篇 |
2016年 | 52篇 |
2015年 | 72篇 |
2014年 | 91篇 |
2013年 | 125篇 |
2012年 | 117篇 |
2011年 | 119篇 |
2010年 | 75篇 |
2009年 | 64篇 |
2008年 | 99篇 |
2007年 | 62篇 |
2006年 | 68篇 |
2005年 | 41篇 |
2004年 | 31篇 |
2003年 | 56篇 |
2002年 | 33篇 |
2001年 | 33篇 |
2000年 | 33篇 |
1999年 | 33篇 |
1998年 | 21篇 |
1997年 | 17篇 |
1996年 | 18篇 |
1995年 | 23篇 |
1994年 | 11篇 |
1993年 | 11篇 |
1992年 | 11篇 |
1991年 | 8篇 |
1990年 | 3篇 |
1989年 | 2篇 |
1985年 | 3篇 |
1975年 | 1篇 |
排序方式: 共有1677条查询结果,搜索用时 31 毫秒
1.
Xi-Gao Shao Bi-Feng Liao Bang-Yi Li 《International Journal of Sustainable Engineering》2019,12(1):30-37
The rapid development of technology has made it easier to distribute products directly, and many enterprises excel at executing a multi-channel strategy to distribute products. The introduction of direct channel adds a new competition dimension to the enterprises. This paper considers three market channel structures: R-Channel, D-Channel and H-Channel. In R-Channel, both new products and remanufactured products are sold through a retailer. In D-Channel, new products are sold through retailers and remanufactured products are sold directly to consumers. In H-Channel, new products are sold through retailers, while remanufactured products through dual channel. Using the game theory, we obtain and analyse the equilibrium prices, market demands and the profits gain under these three settings. At the same time, the influence of consumers’ willingness to pay on the environment performance is researched. Our results show that the manufacturer prefers H-Channel. By introducing the direct channel the manufacturer is always economically better off, but it is not for the retailer. The numerical simulation also confirms the theoretical analysis and shows that H-Channel has advantages of economic benefit and environmental performance. It is feasible for practical application. 相似文献
2.
This study uses knowledge discovery concepts to analyze large amounts of data step by step for the purpose of assisting in the formulation of environmental policy. We performed data cleansing and extracting from existing nation-wide databases, and used regression and classification techniques to analyze the data. The current water hardness in Kaohsiung, Taiwan contributes to the prevention of cardiovascular disease (CVD) but exacerbates the development of renal stones (RS). However, to focus on water hardness alone to control RS would not be cost effective at all, because the existing database parameters do not adequately allow for a clear understanding of RS. Analysis of huge amounts of data can most often turn up the most reliable and convincing results and the use of existing databases can be cost-effective. 相似文献
3.
采用盐酸溶液对蛭石进行浸渍处理,考察了盐酸溶液改性蛭石对气态单质汞的吸附能力。研究结果表明:盐酸溶液改性蛭石对气态单质汞的吸附效果好于未改性蛭石,盐酸浓度为4.0mol/L时,盐酸溶液改性蛭石对气态单质汞的吸附效果较佳;进气中气态单质汞的质量浓度越高,盐酸溶液改性蛭石对气态单质汞的去除率越低;适当提高吸附温度对盐酸溶液改性蛭石吸附气态单质汞较有利;降低蛭石粒径,盐酸溶液改性蛭石对气态单质汞的去除率提高。 相似文献
4.
5.
EffectofacidprecipitationonleachingofnutritionsandaluminiumfromforestsoilsDaiZhaohua;LiaoBohan;WangZhihaiWangXingjun;LiuYunxi... 相似文献
6.
7.
通过对脉冲澄清池在综合废水处理中运行效果的跟踪分析,确定出利用脉冲澄清池补充处理生化后废水(悬浮物、COD_(cr)、BOD_5等)的影响程度,为其在综合废水处理工艺中的应用及其局限性,提供了必要的参考依据. 相似文献
8.
9.
10.