全文获取类型
收费全文 | 637篇 |
免费 | 19篇 |
国内免费 | 27篇 |
专业分类
安全科学 | 101篇 |
废物处理 | 20篇 |
环保管理 | 110篇 |
综合类 | 287篇 |
基础理论 | 43篇 |
污染及防治 | 71篇 |
评价与监测 | 29篇 |
社会与环境 | 10篇 |
灾害及防治 | 12篇 |
出版年
2023年 | 10篇 |
2022年 | 6篇 |
2021年 | 7篇 |
2020年 | 18篇 |
2019年 | 11篇 |
2018年 | 2篇 |
2017年 | 7篇 |
2016年 | 12篇 |
2015年 | 24篇 |
2014年 | 17篇 |
2013年 | 42篇 |
2012年 | 35篇 |
2011年 | 43篇 |
2010年 | 22篇 |
2009年 | 29篇 |
2008年 | 25篇 |
2007年 | 29篇 |
2006年 | 36篇 |
2005年 | 22篇 |
2004年 | 33篇 |
2003年 | 55篇 |
2002年 | 32篇 |
2001年 | 19篇 |
2000年 | 34篇 |
1999年 | 29篇 |
1998年 | 11篇 |
1997年 | 19篇 |
1996年 | 12篇 |
1995年 | 7篇 |
1994年 | 17篇 |
1993年 | 8篇 |
1992年 | 3篇 |
1991年 | 1篇 |
1989年 | 1篇 |
1985年 | 1篇 |
1984年 | 2篇 |
1981年 | 1篇 |
1978年 | 1篇 |
排序方式: 共有683条查询结果,搜索用时 31 毫秒
91.
92.
针对海上溢油应急处理问题,本文主要对溢油的初级行为--扩散进行探讨.提出了采用溢油扩散图像来预测溢油扩散未来发展趋势的3步非线性处理过程,即图像边缘检测、面积计算和面积预测,对这一过程中应采用的方法进行了分析与比较.并以奥里油在静止海水中扩散为范例,在MATLAB环境下,利用非线性方法对扩散图像进行边缘监测,通过对梯度算子阀值的调整来计算完整的油膜覆盖面积,并将其计算结果进行BP神经网络预测.结果表明:采用Roberts边缘算子可以得到很好的边缘检测结果,采用BP神经网络获得的面积预测结果与实验结果吻合程度较好. 相似文献
93.
我国船舶溢油污染事故溢油量评估方法及其应用 总被引:1,自引:1,他引:0
鉴于污染面积和溢油量对溢油污染事故的重要性,本文作者根据多年工作经验,从实际应用出发,给出了适用于我国船舶溢油污染事故污染面积和溢油量评估的几种技术方法,并给出了应用实例.同时阐述了每种评估方法的实质以及其自身的技术局限性,以及在实例中发挥的作用.旨在推进我国的污染面积和溢油量评估工作,实现规范化、系统化评估,提高船舶溢油污染事故的处理效率. 相似文献
94.
95.
96.
This paper presents an experimental investigation on oil leakage from the double hull tanker (DHT). It is designed to explore the dynamic process of oil leakage from bottom-rupture hole of DHT. The experimental test shows the leakage resistance mechanism of ballast tank space. The behavior of oil leakage from damaged DHT and dynamic features of flow in the overall process are demonstrated from experimental results. The overall process of oil leakage is divided into free-leakage and resistance-leakage stage according to the corresponding power to study the dynamic features of oil-water flow inside or outside the tank. The corresponding dominated factors of oil leakage in different stage are also pointed out, and the unsteady Bernoulli’s equation is used to verify experimental results. Meanwhile, viscous effect in leakage process is discussed and the importance of hydrodynamic features associated with the mechanism of oil leakage is explored from experimental results. 相似文献
97.
As an insufficiently utilized energy resource,oil shale is conducive to the formation of characteristic microbial communities due to its special geological origins.However,little is known about fungal diversity in oil shale.Polymerase chain reaction cloning was used to construct the fungal ribosomal deoxyribonucleic acid internal transcribed spacer(r DNA ITS)clone libraries of Huadian Mine in Jilin Province,Maoming Mine in Guangdong Province,and Fushun Mine in Liaoning Province.Pure culture and molecular identification were applied for the isolation of cultivable fungi in fresh oil shale of each mine.Results of clone libraries indicated that each mine had over 50% Ascomycota(58.4%–98.9%)and 1.1%–13.5%unidentified fungi.Fushun Mine and Huadian Mine had 5.9% and 28.1% Basidiomycota,respectively.Huadian Mine showed the highest fungal diversity,followed by Fushun Mine and Maoming Mine.Jaccard indexes showed that the similarities between any two of three fungal communities at the genus level were very low,indicating that fungi in each mine developed independently during the long geological adaptation and formed a community composition fitting the environment.In the fresh oil-shale samples of the three mines,cultivable fungal phyla were consistent with the results of clone libraries.Fifteen genera and several unidentified fungi were identified as Ascomycota and Basidiomycota using pure culture.Penicillium was the only genus found in all three mines.These findings contributed to gaining a clear understanding of current fungal resources in major oil-shale mines in China and provided useful information for relevant studies on isolation of indigenous fungi carrying functional genes from oil shale. 相似文献
98.
Sulfate reducing bacteria(SRB) play significant roles in anaerobic environments in oil sands mature fine tailings(MFTs). Hydrogen sulfide(H2S) is produced during the biological sulfate reduction process. The production of toxic H_2S is one of the concerns because it may hinder the landscape remediation efficiency of oil sands tailing ponds. In present study, the in situ activity and the community structure of SRB in MFT and gypsum amended MFT in two settling columns were investigated. Combined techniques of H_2S microsensor and dissimilatory sulfite reductase β-subunit(dsrB) genes-based real time quantitative polymerase chain reaction(qPCR) were applied to detect the in situ H_2S and the abundance of SRB. A higher diversity of SRB and more H_2S were observed in gypsum amended MFT than that in MFT, indicating a higher sulfate reduction activity in gypsum amended MFT; in addition, the activity of SRB varied as depth in both MFT and gypsum amended MFT: the deeper the more H_2S produced. Long-term plans for tailings management can be assessed more wisely with the information provided in this study. 相似文献
99.
文章综述了鼠李糖脂生物表面活性剂的研究进展包括其化学结构、产生茵及其发酵影响因素,特别讨论了鼠李糖脂在石油污染修复中的应用,并对未来鼠李糖脂发酵工艺中低成本生产原料的筛选开发和对其使用所造成的环境影响进行评价的研究方向进行了展望。 相似文献
100.
封闭式存贮塘处理采油污水的可行性研究 总被引:1,自引:0,他引:1
针对石西油田的区域特点,从工程设计、气象、地质、投资等多方面对该地区利用封闭式存贮塘处理采油的可行性进行了分析研究,提出该法可作为相似地区油田采油废水处理方法借鉴的观点 相似文献