全文获取类型
收费全文 | 115篇 |
免费 | 11篇 |
国内免费 | 45篇 |
专业分类
安全科学 | 15篇 |
废物处理 | 16篇 |
环保管理 | 11篇 |
综合类 | 84篇 |
基础理论 | 10篇 |
污染及防治 | 29篇 |
评价与监测 | 3篇 |
社会与环境 | 2篇 |
灾害及防治 | 1篇 |
出版年
2023年 | 2篇 |
2022年 | 3篇 |
2021年 | 3篇 |
2020年 | 7篇 |
2019年 | 4篇 |
2018年 | 4篇 |
2017年 | 1篇 |
2016年 | 4篇 |
2015年 | 7篇 |
2014年 | 2篇 |
2013年 | 12篇 |
2012年 | 10篇 |
2011年 | 11篇 |
2010年 | 7篇 |
2009年 | 12篇 |
2008年 | 4篇 |
2007年 | 8篇 |
2006年 | 12篇 |
2005年 | 16篇 |
2004年 | 8篇 |
2003年 | 4篇 |
2002年 | 10篇 |
2001年 | 6篇 |
2000年 | 2篇 |
1999年 | 2篇 |
1998年 | 3篇 |
1996年 | 1篇 |
1995年 | 1篇 |
1994年 | 2篇 |
1993年 | 1篇 |
1986年 | 1篇 |
1974年 | 1篇 |
排序方式: 共有171条查询结果,搜索用时 890 毫秒
131.
Zhixin Song Gangfu Song Wenzhong Tang Dandan Yan Minghai Han Baoqing Shan 《环境科学学报(英文版)》2020,32(5):160-167
Cadmium(Cd) uptake by plants or benthic organisms largely depends on its bioavailability in sediments,so it is necessary to understand Cd bio availability for determining its ecological risks in riverine sediments.Pore water is easily disturbed during sample collection,indicating that there was a shortage of traditional methods for investigating Cd bio availability.Here,sediment cores were collected from rivers,after which sequential extraction and diffusive gradients in thin films(DGT) method were employed to determine Cd potential bio availability in the sediments and pore water.We found that Cd concentrations measured by DGT were lower than that in pore water profiles,and Cd distribution in various fractions changed remarkably.Pearson correlation analysis showed significant positive correlations between Cd concentrations measured by DGT and total Cd concentrations(r~2=0.76),exchangeable and weak acid soluble fraction(r~2=0.68),ferromanganese fraction(r~2=0.72) and bound organic matter or oxidizable fraction(r~2=0.54).However,the correlation was relatively low between Cd concentrations measured by DGT and that in pore water profiles(r~2=0.26).These results demonstrated that DGT method could provide more accurate information of Cd bio availability in sediment profiles than traditional methods. 相似文献
132.
Mobility and sulfidization of heavy metals in sediments of a shallow eutrophic lake, Lake Taihu, China 总被引:3,自引:0,他引:3
Shouliang Huo Jingtian Zhang Kevin M. Yeager Beidou Xi Yanwen Qin Zhuoshi He Fengchang Wu 《环境科学学报(英文版)》2015,27(5):1-11
The technique of DGT (diffusive gradients in thin films) using three diffusive gel thicknesses was applied to estimate the mobility and bioavailability of heavy metals in sediments and porewater of Lake Taihu, China. The DGT results showed significantly positive correlations between Co, Pb, Cd and Mn, and Ni and Fe concentrations in porewater. Cu and Zn showed a significantly negative correlation with Mn, due to Cu combination with carbonates and Zn derived from agricultural pollution, respectively. The rank order of average concentrations of Co, Ni and Cd at each station was DGT1.92 >DGT0.78 >DGT0.39, suggesting stronger resupply from sediments to porewater when using thicker diffusive gels. Comparing centrifugation and DGT measurements, Co, Ni and Cd are highly labile; Mn and Fe are moderately labile; and Cu, Zn and Pb are slightly labile. The variations of AVS concentrations in sediment cores indicate that metal sulfides in deeper layers are easily diffused into surface sediments. 相似文献
133.
薄膜干燥法再生聚苯乙烯树脂的研究 总被引:2,自引:0,他引:2
利用溶剂溶解回收的聚苯乙烯塑料,将其涂布于不锈钢传送带上,以水蒸气为加热介质,经薄膜干燥法获得再生聚苯乙烯树脂.再生的聚苯乙烯树脂性能优异,溶剂回收率达97%以上. 相似文献
134.
135.
以漂珠为载体,探索采用液相沉积法制备TiO2/SiO2膜最佳条件。在自制的光催化反应器中,在相同的条件下,以酸性嫩黄和难处理的焦化废水为目标降解物,做了TiO2/SiO2和TiO2两种膜的光催化氧化对比试验。结果表明,与单一TiO2膜比较,以漂珠为载体,采用液相沉积法制备的TiO2/SiO2改性膜具有较高的光催化氧化性能。 相似文献
136.
The feasibility of photocatalytic degradation of organochlorine compounds using TiO2 supported on fiberglass cloth as a photocatalyst was studied. The results showed that 2.0×10-4 mol/dm3 of dichloroethylene, trichloroethylene and tetrachloroethylene can be completely photocatalytically degraded within a short time under illumination with a 375W medium pressure mercury lamp. The effects of parameters such as illumination time, initial concentration of organochlorine compounds, amount of air flow and concentration of H2O2 on the photocatalytic degradation were investigated. The TiO2 supported on the fiberglass was not easily detached and after 500h illumination there was no significant loss of photocatalytic activity of TiO2. The passible mechanisms of photocatalytic degradation were discussed. 相似文献
137.
Chen Shi-fu 《环境科学学报(英文版)》1998,10(4):2
1IntroductionOrganochlorinecompoundsarewidelyusedinvariousindustries,andhavebenreportedtocontaminaterunningwater,rivers,lakes... 相似文献
138.
应用适用于板料轴对称成形过程的应力平衡方程对薄壁圆筒工件抛物面型缩口成形中的应力进行了分析 ,得出了薄壁圆筒工件抛物面型缩口成形时的经向应力与各种参数之间的关系及缩口力的计算公式 ,从而为工艺设计人员制定此类缩口工艺提供了方便 相似文献
139.
以空心玻璃微球为载体,采用浸涂法制备出TiO2/beads光催化剂.研究了利用TiO2/beads光催化剂降解水面漂浮的正十二烷及甲苯的可行性.结果表明,375W中压汞灯照射120min,正十二烷的光催化去除率达93.5%,光照80min时甲苯被完全光催化去除;通入空气有利于正二十烷及甲苯的光催化去除,外加微量的H2O2(5.0mmol/L)可大大提高光催化去除率,向反应液中加入少量Na+对正十二烷及甲苯的光催化去除率无明显的影响. 相似文献
140.