全文获取类型
收费全文 | 90篇 |
免费 | 1篇 |
国内免费 | 18篇 |
专业分类
安全科学 | 6篇 |
废物处理 | 2篇 |
环保管理 | 8篇 |
综合类 | 63篇 |
基础理论 | 10篇 |
污染及防治 | 15篇 |
评价与监测 | 5篇 |
出版年
2023年 | 2篇 |
2022年 | 1篇 |
2021年 | 6篇 |
2020年 | 3篇 |
2019年 | 4篇 |
2018年 | 1篇 |
2017年 | 2篇 |
2016年 | 7篇 |
2015年 | 3篇 |
2014年 | 3篇 |
2013年 | 6篇 |
2012年 | 5篇 |
2011年 | 2篇 |
2010年 | 4篇 |
2009年 | 6篇 |
2008年 | 5篇 |
2007年 | 8篇 |
2006年 | 4篇 |
2005年 | 5篇 |
2004年 | 1篇 |
2003年 | 1篇 |
2002年 | 5篇 |
2001年 | 5篇 |
2000年 | 3篇 |
1999年 | 4篇 |
1998年 | 4篇 |
1997年 | 2篇 |
1996年 | 1篇 |
1995年 | 1篇 |
1994年 | 1篇 |
1992年 | 1篇 |
1991年 | 1篇 |
1989年 | 1篇 |
1981年 | 1篇 |
排序方式: 共有109条查询结果,搜索用时 15 毫秒
71.
分别采用(NH4)2HPO4,NH4HCO3,NaHCO3等对赤泥进行活化处理,并制备成球形颗粒,同时研究了活化剂浓度、焙烧温度、焙烧时间等对赤泥除氟剂吸附性能的影响。结果表明:在活化剂质量浓度为10%左右、焙烧温度500℃,焙烧时间2 h时制备的除氟剂具有较好的除氟效果,且采用(NH4)2HPO4,NH4HCO3,NaHCO3对赤泥进行活化处理制备的除氟剂能分别使溶液中氟离子的质量浓度从19 mg/L分别降低到0.085,0.13及0.19 mg/L,相应地除氟剂的吸附容量均达0.94 mg/g以上。 相似文献
72.
Wafa Kharroubi Samia Haj Ahme Thomas Nury Pierre Andreoletti Rachid Sakly Mohamed Hammami Gérard Lizard 《环境科学学报(英文版)》2017,29(1):44-51
The treatment of microglial BV-2 cells with sodium arsenate(As(V):0.1-400 μmol/L — 48 hr)induces a dose-dependent response.The neurotoxic effects of high concentrations of As(V)(100,200 and 400 μmol/L) are characterized by increased levels of mitochondrial complexesⅠ,Ⅱ,and Ⅳ followed by increased superoxide anion generation.Moreover,As(V) triggers an apoptotic mode of cell death,demonstrated by an apoptotic SubG1 peak,associated with an alteration of plasma membrane integrity.There is also a decrease in transmembrane mitochondrial potential and mitochondrial adenosine triphosphate ATP.It is therefore tempting to speculate that As(V) triggers mitochondrial dysfunction,which may lead to defective oxidative phosphorylation subsequently causing mitochondrial oxidative damage,which in turn induces an apoptotic mode of cell death. 相似文献
73.
Compared with groundwater pollution episodes of a point-source nature, nonpoint-source contamination makes for particularly
difficult policy design. This is especially true in the context of a mixed land-use aquifer, where the same pollutant may
derive from various human land-use activities and in different concentrations. To data, the emprirical literature attempting
to estimate the relative loadings of pollutants from alternative land uses is rather sparse. Yet this information is vital
to a variety of numerical computer models used to predict likelihood of groundwater contamination, and the statistical results
are useful in their own right for regional policy formation. Regression analysis is applied to estimate loadings of nitrate
and sodium from various land uses. The model is then used to illustrate how well-intended local groundwater protection policies
that fail to recognize land-use substitution and cross-pollutant effects may be misdirected. 相似文献
74.
75.
The effect of salinity on sludge alkaline fermentation at low temperature(20°C) was investigated, and a kinetic analysis was performed. Different doses of sodium chloride(Na Cl, 0–25 g/L) were added into the fermentation system. The batch-mode results showed that the soluble chemical oxygen demand(SCOD) increased with salinity. The hydrolysate(soluble protein, polysaccharide) and the acidification products(short chain fatty acids(SCFAs), NH+4–N, and PO_4~(3-)–P) increased with salinity initially, but slightly declined respectively at higher level salinity(20 g/L or 20–25 g/L). However, the hydrolytic acidification performance increased in the presence of salt compared to that without salt.Furthermore, the results of Haldane inhibition kinetics analysis showed that the salt enhanced the hydrolysis rate of particulate organic matter from sludge particulate and the specific utilization of hydrolysate, and decreased the specific utilization of SCFAs. Pearson correlation coefficient analysis indicated that the importance of polysaccharide on the accumulation of SCFAs was reduced with salt addition, but the importance of protein and NH+4–N on SCFA accumulation was increased. 相似文献
76.
高分子凝胶球去除废水中重金属离子的研究 总被引:6,自引:2,他引:4
用海藻酸钠(SA)、海藻酸钠-聚乙烯醇(SA—PVA)、海藻酸钠-聚氧化乙烯(SA—PEO)凝胶球作为吸附剂吸附溶液中的Pb^2+。探讨了凝胶球固定化时间、吸附时间、溶液pH值、溶液初始浓度对Pb^2+去除率的影响,并对吸附动力学方程进行了分析。结果表明:固定化时间对去除率的影响较小;反应速率较快,吸附时间在10min时,三种凝胶球对Pb^2+的去除率就分剐达到了80%、82%和88%,吸附时间在2h后基本达到吸附平衡,三种凝胶球对Pb^2+的吸附能力为:SA—PGE〉SA—PVA〉SA;三种凝胶球吸附铅离子的行为均符合一级反应动力学方程;溶液的pH在4~6时有较高的去除率;三种凝胶球对不同金属的吸附能力为Pb^2+〉Cu^2+〉Cd^2+;饱和吸附后的三种凝胶球均可以再生利用。 相似文献
77.
The media from primary cultures and subcultures of second trimester human amniotic fluid (AF) cells were assayed by radioimmunoassay to quantitate production of human chorionic gonadotropin (hCG). Primary AF cultures produce more hCG per cell than do the corresponding subcultures. Sodium butyrate (2 mM) stimulates AF subcultures to produce 5-13 times more hCG per cell or per mg of cellular protein than do untreated subcultures. This stimulatory effect of sodium butyrate is dose dependent between 0 and 5 mM. Addition of sodium butyrate 24 hours after subculture, while stimulating production of hCG during the subsequent 3 days, also results in fewer cells and less protein per culture. This effect on cell growth is also dose-dependent. Previous investigators have proposed that the stimulation of hCG by sodium butyrate in other types of cell cultures is due to an effect of that agent on culture growth. Therefore, in these studies AF cells are allowed to grow to confluency before sodium butyrate was added. Production of hCG was stimulated by sodium butyrate about four-fold during the next 5 days although no significant changes were observed either in number of cells or amount of cellular protein per culture. These results suggest that stimulation of hCG by sodium butyrate is not dependent on its effect on growth of the cultures. 相似文献
78.
王晓松 《辽宁城乡环境科技》1999,19(3):77-80
介绍蓝法法工艺技术综合治理高浓度含氰废水过程,将废水含CN^-浓度由几千mg/L降至2mg/L左右,并回收含CN^-物质制取黄血盐医药产品,取得较好的经济效益。 相似文献
79.
含铵,钠和铁盐废水处理的方法 总被引:2,自引:0,他引:2
介绍了国内外处理不同浓度含铵、钠和铁盐废水的实用技术与动态。力求为废水处理和资源回收提供参考。 相似文献
80.