全文获取类型
收费全文 | 1033篇 |
免费 | 21篇 |
国内免费 | 49篇 |
专业分类
安全科学 | 32篇 |
废物处理 | 211篇 |
环保管理 | 241篇 |
综合类 | 408篇 |
基础理论 | 45篇 |
环境理论 | 1篇 |
污染及防治 | 80篇 |
评价与监测 | 71篇 |
社会与环境 | 14篇 |
出版年
2024年 | 2篇 |
2023年 | 6篇 |
2022年 | 14篇 |
2021年 | 15篇 |
2020年 | 31篇 |
2019年 | 12篇 |
2018年 | 8篇 |
2017年 | 11篇 |
2016年 | 20篇 |
2015年 | 23篇 |
2014年 | 108篇 |
2013年 | 67篇 |
2012年 | 32篇 |
2011年 | 66篇 |
2010年 | 19篇 |
2009年 | 52篇 |
2008年 | 43篇 |
2007年 | 56篇 |
2006年 | 52篇 |
2005年 | 33篇 |
2004年 | 40篇 |
2003年 | 50篇 |
2002年 | 48篇 |
2001年 | 41篇 |
2000年 | 46篇 |
1999年 | 33篇 |
1998年 | 42篇 |
1997年 | 29篇 |
1996年 | 25篇 |
1995年 | 13篇 |
1994年 | 35篇 |
1993年 | 15篇 |
1992年 | 5篇 |
1990年 | 2篇 |
1989年 | 2篇 |
1987年 | 1篇 |
1986年 | 1篇 |
1984年 | 1篇 |
1982年 | 1篇 |
1979年 | 1篇 |
1977年 | 1篇 |
1973年 | 1篇 |
排序方式: 共有1103条查询结果,搜索用时 140 毫秒
631.
废旧锌锰电池回收处理工艺的探讨 总被引:2,自引:0,他引:2
由于电池耗费量日益增加,废旧电池导致的环境污染问题倍受关注。通过对废旧电池的调研和处理技术的对比研究,提出了“焙烧—电解”回收处理废旧锌锰电池的工艺技术。在600℃、隔绝空气焙烧3h的试验条件下,“焙烧—电解”工艺不仅可回收大量的二氧化锰、锌、氯化锌、炭棒、铜帽、铁皮、蜡等资源,而且废气、废水、废渣经处理后完全达标排放。阐述了具体的“焙烧—电解”工艺。 相似文献
632.
国家半导体行业VOC排放标准制订研究 总被引:1,自引:0,他引:1
随着近年来我国半导体产业的持续繁荣发展,中国已成为全球半导体制造增长最为迅速的市场。为有效控制监管半导体生产过程中大量使用的各种有机溶剂所产生的废气中可挥发性有机物(VOC)的排放,加强行业污染控制,规范行业环境保护管理工作,对制订半导体行业VOC排放标准进行了研究。概述了半导体行业VOC排放的特点。分析了该行业对VOC排放的治理技术。阐述了美国和中国台湾地区有关半导体行业VOC废气的排放标准。从国内半导体企业VOC治理现状、现有监测技术、VOC排放管理方式等方面探讨了我国半导体行业VOC废气排放标准的制定思路。 相似文献
633.
以当前我国城市生活垃圾焚烧处理现状为依据,通过文献综述法详细介绍了城市垃圾焚烧过程中重金属的迁移及分布规律,并提出重金属污染防控对策建议。 相似文献
634.
Calcium carbonate waste from an integrated pulp and paper mill as a potential liming agent 总被引:1,自引:0,他引:1
Calcium carbonate is used in large amounts in the pulp and paper industry as a paper filler. When it is manufactured, the
calcium carbonate waste is purged from the process. Here we demonstrate that, due to the elevated calcium concentration of
168.5 g kg−1 dry weight (dw), alkaline pH of 12.6 and neutralizing (liming) effect value of 42.4% expressed as Ca equivalents, this waste
is a potential liming agent and a pH buffer. The heavy metal concentrations in the waste were lower than the new Finnish limit
values for fertilizers used in agriculture, as well as for a material, e.g. ash, used as an earth construction agent. These
limit values came into force in March 2007 and in June 2006, respectively. 相似文献
635.
Zaki Alam Pushan Ehsanur Rahman Nafisa Islam Nirupam Aich 《Frontiers of Environmental Science & Engineering》2022,16(10):128
636.
637.
Priyansh Singh 《International Journal of Sustainable Engineering》2019,12(2):141-148
Due to inherent advantages, waste polyethylene (generated from domestic sources) has been used as asphalt modifier. This article discusses viscoelastic properties of the polyethylene modified asphalt binder. Several asphalt concrete mixtures were designed by varying polyethylene and asphalt content. Shredded polyethylene incorporated into asphalt concrete by dry mixing process. Using optimised asphalt content (at several polyethylene percentages), mixtures were prepared and compacted. These compacted specimens were aged for different duration in convection oven. Asphalt binder (from aged specimens) was extracted and tested for its viscoelastic properties using dynamic shear rheometer. Comparison of mastercurves indicated increase in complex modulus and decrease in phase angle values with addition of polyethylene at all reduced frequencies. However, the extent of change was highly dependent on frequency, aging duration and polyethylene content. This indicates that the addition of polyethylene provides more resilience to asphalt binder especially with less aging time. Storage modulus mastercurves (at lower frequencies) and relaxation modulus values (at longer time) indicate polyethylene provides additional stiffening to binder. Further, changes in viscous modulus with addition of polyethylene were marginal. Overall results indicate that waste polyethylene improves the properties of asphalt binder over extended loading period when heated for less time during mixing. 相似文献
638.
Ping Zhu Shuangshuang Gong Mingqiang Deng Bin Xia Yazheng Yang Jiakang Tang Guangren Qian Fang Yu Ashantha Goonetilleke Xiaowei Li 《Frontiers of Environmental Science & Engineering》2023,17(3):38
639.
The food supply chain is affected by losses of products near to their expiry date or damaged by improper transportation or production defects. Such products are usually poorly attractive for the consumer in the target market even if they maintain their nutritional properties. On the other hand undernourished people face every day the problem of fulfilling their nutritional needs usually relying on non-profit organizations. In this field the food recovery enabling economic benefits for donors is nowadays seen as a coherent way to manage food products unsalable in the target market for various causes and thus destined to be discarded and disposed to landfill thus representing only a cost. Despite its obvious affordability the food recovery is today not always practiced because the economic benefits that could be achieved are barely known. The paper aims at presenting a deterministic mathematical model for the optimization of the supply chain composed by retailers and potential recipients that practice the food recovery, taking into account the benefits recognized to donors and the management costs of the food recovery. The model determines the optimal time to withdraw the products from the shelves as well as the quantities to be donated to the non-profit organizations and those to be sent to the livestock market maximizing the retailer profit. The results show that the optimal conditions ensuring the affordability of the food recovery strategy including the tax reliefs and cost saving for the retailers outperforms the profit achievable in absence of such a system. 相似文献
640.
Carlos Afonso Teixeira Catarina Avelino Fátima Ferreira Isabel Bentes 《Waste management (New York, N.Y.)》2014,34(9):1584-1594
The increase of Municipal Solid Waste (MSW) generated over the last years forces waste managers pursuing more effective collection schemes, technically viable, environmentally effective and economically sustainable. The assessment of MSW services using performance indicators plays a crucial role for improving service quality. In this work, we focus on the relevance of regular system monitoring as a service assessment tool. In particular, we select and test a core-set of MSW collection performance indicators (effective collection distance, effective collection time and effective fuel consumption) that highlights collection system strengths and weaknesses and supports pro-active management decision-making and strategic planning. A statistical analysis was conducted with data collected in mixed collection system of Oporto Municipality, Portugal, during one year, a week per month. This analysis provides collection circuits’ operational assessment and supports effective short-term municipality collection strategies at the level of, e.g., collection frequency and timetables, and type of containers. 相似文献