全文获取类型
收费全文 | 565篇 |
免费 | 74篇 |
国内免费 | 111篇 |
专业分类
安全科学 | 139篇 |
废物处理 | 62篇 |
环保管理 | 62篇 |
综合类 | 355篇 |
基础理论 | 26篇 |
污染及防治 | 94篇 |
评价与监测 | 5篇 |
社会与环境 | 6篇 |
灾害及防治 | 1篇 |
出版年
2024年 | 1篇 |
2023年 | 13篇 |
2022年 | 9篇 |
2021年 | 18篇 |
2020年 | 12篇 |
2019年 | 12篇 |
2018年 | 12篇 |
2017年 | 12篇 |
2016年 | 21篇 |
2015年 | 26篇 |
2014年 | 23篇 |
2013年 | 58篇 |
2012年 | 48篇 |
2011年 | 44篇 |
2010年 | 26篇 |
2009年 | 33篇 |
2008年 | 22篇 |
2007年 | 50篇 |
2006年 | 63篇 |
2005年 | 46篇 |
2004年 | 28篇 |
2003年 | 46篇 |
2002年 | 22篇 |
2001年 | 23篇 |
2000年 | 24篇 |
1999年 | 13篇 |
1998年 | 14篇 |
1997年 | 9篇 |
1996年 | 5篇 |
1995年 | 8篇 |
1994年 | 5篇 |
1993年 | 2篇 |
1989年 | 1篇 |
1987年 | 1篇 |
排序方式: 共有750条查询结果,搜索用时 31 毫秒
61.
62.
Pierre Mineau Kanth M.S. Sundaram Alam Sundaram Cecilia Feng Donald G. Busby Peter A. Pearce 《Journal of environmental science and health. Part. B》2013,48(1):105-135
Abstract Four test groups of small songbirds (Zebra Finch, Poephila guttata) were sprayed in a chamber with varying concentrations of fenitrothion. Exposure levels were assessed by monitoring air concentrations, deposits of the active ingredient (AI) on glass plates and droplets/cm2 on Kromekote® cards. All indices of exposure were linearly correlated and the mean AI deposit on glass plates for the four groups tested were equivalent to 38, 51, 139 and 255 g/ha or 14%, 18%, 50% and 91% of the highest permissible emitted rate for broadscale forest spraying in Canada. Significant depression in body weights and brain acetylcholinesterase levels were noted only for the highest exposure group. Fenitrothion residues in blood were detectable only at the highest exposure level, and in liver at the two higher levels. Carcass and feather residues were much higher than those in blood and liver, and were detectable at all exposure levels but the residues did not increase linearly with exposure. For one of the spray groups, we were able to compute an equivalent acute oral dose based on matching acetylcholinesterase inhibition. 相似文献
63.
为了治理同时含有气态和粒状污染物的锌合金白烟,采用填料塔对其进行洗涤和吸收,考察了吸收液的pH值以及喷淋密度对锌合金白烟处理效果的影响,并根据碱洗和酸洗的特点,考察了碱酸两级处理的效果.结果显示,吸收液的喷淋密度与氯化铵烟尘、氯化氢和氨的处理效率成正比.吸收液的pH值也会影响白烟的处理效果,主要是通过吸收液与污染物之间的化学反应来进行,碱洗时氯化铵烟尘和氯化氢获得了较高的处理效率,但碱洗过程有氨生成,限制其应用;酸洗对氨的处理效率较高,但氯化铵烟尘和氯化氢的处理效率都比较低,达不到国家排放标准.尽管对锌白烟的处理效果还不理想,但试验结果对于锌白烟的治理具有重要的参考价值和指导意义. 相似文献
64.
65.
钱金平 《城市环境与城市生态》2001,14(3):50-51,53
运用专家调查打分法,以具体的承德兴业造纸项目为例,初步探讨了清滞生产量化评价方法,程序以及清洁生产评价指标的应用。 相似文献
66.
67.
Citizen science networks in natural history and the collective validation of biodiversity data 下载免费PDF全文
Biodiversity data are in increasing demand to inform policy and management. A substantial portion of these data is generated in citizen science networks. To ensure the quality of biodiversity data, standards and criteria for validation have been put in place. We used interviews and document analysis from the United Kingdom and The Netherlands to examine how data validation serves as a point of connection between the diverse people and practices in natural history citizen science networks. We found that rather than a unidirectional imposition of standards, validation was performed collectively. Specifically, it was enacted in ongoing circulations of biodiversity records between recorders and validators as they jointly negotiated the biodiversity that was observed and the validity of the records. These collective validation practices contributed to the citizen science character or natural history networks and tied these networks together. However, when biodiversity records were included in biodiversity‐information initiatives on different policy levels and scales, the circulation of records diminished. These initiatives took on a more extractive mode of data use. Validation ceased to be collective with important consequences for the natural history networks involved and citizen science more generally. 相似文献
68.
本文阐述了运用生态工艺,成功地将工艺组成一套占地少、操作简便、外形美观的机械设备,治理了广元电子灯饰总厂的漆雾废气。治理后,其排放浓度,低于《四川省标准》的任一标准值。 相似文献
69.
70.
真空碳酸钾脱硫工艺碱洗段废液因含有高浓度硫化物、COD等有毒成分而影响焦化废水后续生物处理。以焦化企业实际碱洗段废液为研究对象,选用化学沉淀和电催化氧化的组合方式对其进行预处理。结果表明,室温下当氧化铜的投加量为65 g/L、反应时间60 min时废液中S2-去除率可达93%,且经过高温灼烧可实现Cu O沉淀剂的再生使用。沉淀后出水经电催化氧化处理,在电流10 A、电压4.9 V、电解时间120 min的条件下,出水COD可降至2 400 mg/L,满足常规生化系统进水的要求。 相似文献