全文获取类型
收费全文 | 219篇 |
免费 | 16篇 |
国内免费 | 81篇 |
专业分类
安全科学 | 21篇 |
废物处理 | 4篇 |
环保管理 | 20篇 |
综合类 | 123篇 |
基础理论 | 48篇 |
污染及防治 | 66篇 |
评价与监测 | 7篇 |
社会与环境 | 18篇 |
灾害及防治 | 9篇 |
出版年
2023年 | 3篇 |
2022年 | 12篇 |
2021年 | 11篇 |
2020年 | 11篇 |
2019年 | 11篇 |
2018年 | 12篇 |
2017年 | 12篇 |
2016年 | 11篇 |
2015年 | 12篇 |
2014年 | 13篇 |
2013年 | 12篇 |
2012年 | 30篇 |
2011年 | 27篇 |
2010年 | 16篇 |
2009年 | 14篇 |
2008年 | 18篇 |
2007年 | 19篇 |
2006年 | 11篇 |
2005年 | 9篇 |
2004年 | 7篇 |
2003年 | 5篇 |
2002年 | 4篇 |
2001年 | 7篇 |
2000年 | 2篇 |
1999年 | 3篇 |
1998年 | 2篇 |
1997年 | 1篇 |
1996年 | 4篇 |
1995年 | 4篇 |
1994年 | 2篇 |
1993年 | 3篇 |
1992年 | 3篇 |
1990年 | 2篇 |
1988年 | 2篇 |
1987年 | 1篇 |
排序方式: 共有316条查询结果,搜索用时 15 毫秒
151.
生物滴滤床净化含H2S废气的实验研究 总被引:2,自引:0,他引:2
采用生物滴滤床(BTF)对某制药厂污水站含H2S废气进行净化实验.结果表明,在循环营养液温度为25~30℃、pH为1~3、空床停留时间(EBRT)为13.5s、废气中H2S质量浓度在200~600 mg/m3时,BTF系统对H2S的去除率基本保持在90%以上,且稳定性良好;循环营养液中SO24-浓度的累积会降低系统H2S的去除率;随着BTF填料体积因压实而减小,H2S去除率减小.可通过改变系统操作条件或用稀碱液冲洗等方法防止填料堵塞;BTF系统在特殊工况下,具有较好的恢复性能. 相似文献
152.
153.
Ying Feng Qiong Wang Qian Meng Yongjun Liu Fengshan Pan Sha Luo Yingjie Wu Luyao M Xiaoe Yang 《环境科学学报(英文版)》2019,31(12):87-96
Sedum alfredii Hance is a cadmium(Cd)/zinc(Zn) hyperaccumulator native to China.However, its relatively low biomass restricted the large-scale application for heavy metal contamination remediation. The chromosome set doubling of S. alfredii in vitro was achieved by 0.1%–0.2%(W/V) colchicine treatment. The plant DNA ploidy was analyzed by flow cytometry and chromosome set doubling plants(CSD) were identified based on the obvious different sharp peak. A tissue culture experiment with different Cd treated levels and a field trial with natural polluted mined soil were conducted to study the effects of chromosome doubling on plant biomass and Cd accumulation in shoots. The results suggested that S.alfredii is a mixoploid. Compared with the wild type plants(WT), CSD exhibited typical"gigas" characteristics in morphology including stem thickness, root hair production,number of leaves and size of stoma guard cell. Fresh weight and dry weight of CSD were increased to 1.62–2.03-fold and 2.26–3.25-fold of WT. And Cd content of CSD showed a17.49%–42.82% increase and 59% increase under tissue culture and field condition,accordingly. In addition, the TF and in BCF of CSD were 2.37-and 1.59-fold of WT,respectively. These results proved that it is feasible to promote phytoextraction efficiency of S. alfredii in Cd contaminated soils through chromosomal engineering, which provides a novel approach for hyperaccumulator application in phytoremediation. 相似文献
154.
155.
随着HSE管理体系在石油石化企业的全面建立和运行,HSE管理的信息化建设也得到了越来越多的重视。利用现代信息技术,结合本企业HSE管理体系的要求,建立企业HSE管理系统,可以全面规范和提升企业HSE管理,解决HSE管理体系运行过程中的“两张皮”现象,确保企业HSE管理体系的有效运行。 相似文献
156.
157.
Effect of cypermethrin insecticide on the microbial community in cucumber
phyllosphere 总被引:2,自引:0,他引:2
ZHANG Baoguo ZHANG Hongxun JIN Bo TANG Ling YANG Jianzhou LI Baoju ZHUANG Guoqiang BAI Zhihui 《环境科学学报(英文版)》2008,20(11):1356-1362
Cucumber (Cucumis sativus) is one of the most widely used vegetable in the world,and different pesticides have been extensively used for controlling the insects and disease pathogens of this plant.However,little is known about how the pesticides affect the microbial community in cucumber phyllosphere.This study was the first attempt to assess the impact of pyrethroid insecticide cyperemethrin on the microbial communities of cucumber phyllosphere using biochemical and genetic approaches.Phospholipid fatty ac... 相似文献
158.
克劳氏芽孢杆菌(Bacillus clausii S-4)吸附Zn2+的研究 总被引:2,自引:0,他引:2
为了验证生物吸附剂去除废水中重金属离子Zn2+的可行性,筛选了一株高效吸附Zn2+的微生物菌株克劳氏芽孢杆菌Bacillus clausii S-4。采用火焰原子吸收、红外光谱和扫描电镜能谱分析,对这种新型生物吸附剂在水相中吸附Zn2+的性能和机理进行了研究。结果表明,B. clausii S-4菌体在20 ℃、30 ℃、40 ℃条件下,吸附Zn2+的最佳pH为4.5,吸附容量为57.5 mg/g,吸附容量随温度的升高而增加,吸附过程是吸热反应,吸附平衡时间约30 min。吸附前后,B. clausii S-4菌体表面上的化学官能团和金属离子发生了明显的变化,—OH、—NH+4、—COOH、(—CO—NH—)、—C6H5等官能团可能参与了吸附过程。0.1 mol/L HNO3、HCl和EDTA对锌的解吸附效果较好。在矿山废水中,B. clausii S-4菌体对Zn2+的吸附效果也比较理想,显示出其潜在的应用价值。 相似文献
159.
160.
High-aspect-ratio microholes have many industrial applications, but are difficult to produce. Femtosecond (fs) and nanosecond (ns) laser ablation may produce potential manufacturing solutions. However, the laser-induced plasma–microhole sidewall interaction has not been well understood for laser ablation of deep microholes, which may significantly affect the hole size and/or quality. This interaction has been investigated in this paper. Due to the huge challenges involved in direct experimental observations, a physics-based model is applied as the research tool, which has been verified by measurements from literatures on laser ablation of flat targets (without deep microholes) that are relatively easy to perform. The study shows that under the same laser pulse fluence, the fs laser-induced plasma generates larger transient peak heat flux to the sidewall than the ns laser pulse. However, the high-heat-flux region moves up very rapidly in the hole, and hence the sidewall temperature is not significantly raised and sidewall melting does not occur under the studied conditions. On the other hand, for the ns laser pulse, the induced plasma maintains a relatively high heat flux to the sidewall near the hole bottom for a much longer time, which yields obvious sidewall melting and surface vaporization. The results are consistent with the previously observed sidewall surface morphology for microholes drilled by fs and ns laser pulses in air with the same pulse energy. 相似文献