全文获取类型
收费全文 | 1588篇 |
免费 | 72篇 |
国内免费 | 679篇 |
专业分类
安全科学 | 116篇 |
废物处理 | 99篇 |
环保管理 | 110篇 |
综合类 | 856篇 |
基础理论 | 338篇 |
污染及防治 | 659篇 |
评价与监测 | 54篇 |
社会与环境 | 44篇 |
灾害及防治 | 63篇 |
出版年
2024年 | 1篇 |
2023年 | 26篇 |
2022年 | 94篇 |
2021年 | 80篇 |
2020年 | 51篇 |
2019年 | 47篇 |
2018年 | 75篇 |
2017年 | 58篇 |
2016年 | 95篇 |
2015年 | 107篇 |
2014年 | 132篇 |
2013年 | 153篇 |
2012年 | 132篇 |
2011年 | 128篇 |
2010年 | 110篇 |
2009年 | 119篇 |
2008年 | 124篇 |
2007年 | 87篇 |
2006年 | 93篇 |
2005年 | 49篇 |
2004年 | 60篇 |
2003年 | 72篇 |
2002年 | 48篇 |
2001年 | 44篇 |
2000年 | 46篇 |
1999年 | 34篇 |
1998年 | 64篇 |
1997年 | 53篇 |
1996年 | 30篇 |
1995年 | 27篇 |
1994年 | 28篇 |
1993年 | 26篇 |
1992年 | 18篇 |
1991年 | 12篇 |
1990年 | 5篇 |
1989年 | 5篇 |
1988年 | 2篇 |
1987年 | 2篇 |
1984年 | 2篇 |
排序方式: 共有2339条查询结果,搜索用时 15 毫秒
291.
292.
Luo Yinbo He Dongfeng 《Environmental science and pollution research international》2021,28(36):49383-49409
Environmental Science and Pollution Research - Mineral carbonation can simultaneously realize the effective treatment of CO2 and iron and steel slag; thus, it is of great significance for the low... 相似文献
293.
Xu Peiwei He Xiaoqing He Shengliang Luo Jinbin Chen Qiang Wang Zuoyi Wang Aihong Lu Beibei Wu Lizhi Chen Yuan Xu Dandan Chen Weizhong Chen Zhijian Wang Xiaofeng Lou Xiaoming 《Environmental science and pollution research international》2021,28(6):6691-6699
Environmental Science and Pollution Research - To better understand the cardiopulmonary alterations associated with personal exposed PM2.5-bound heavy meals, we conducted a cross-sectional study in... 相似文献
294.
Weixuan Zhao Liping Lian Xingpeng Jin Renxi Zhang Gang Luo Huiqi Hou Shanping Chen Ruina Zhang 《Frontiers of Environmental Science & Engineering》2020,14(2):20
295.
Junfeng Dou Guyuan Luo Xiang Liu 《Frontiers of Environmental Science & Engineering》2007,1(2):233-239
Enhanced biological phosphorus removal (EBPR) is a commonly used and sustainable method for phosphorus removal from wastewater. Poly-β-hydroxybutyrate (PHB), polyphosphate, and glycogen are three kinds of intracellular storage polymers in phosphorus accumulation organisms. The variation of these polymers under different conditions has an apparent influence on anaerobic phosphorus release, which is very important for controlling the performance of EBPR. To obtain the mechanism and kinetic character of anaerobic phosphorus release, a series of batch experiments were performed using the excessively aerated sludge from the aerobic unit of the biological phosphorus removal system in this study. The results showed that the volatile suspended solid (VSS) had an increasing trend, while the mixed liquid suspended sludge (MLSS) and ashes were reduced during the anaerobic phosphorus release process. The interruption of anaerobic HAc-uptake and phosphorus-release occurs when the glycogen in the phosphorus-accumulating-organisms is exhausted. Under the condition of lower initial HAc-COD, HAc became the limiting factor after some time for anaerobic HAc uptake. Under the condition of higher initial HAc-COD, HAc uptake was stopped because of the depletion of glycogen in the microorganisms. The mean ratio of Δρ P/Δρ PHB, Δρ GLY/Δρ PHB, Δρ P/ΔCOD, was 0.48, 0.50, 0.44, and 0.92, respectively, which was nearly the same as the theoretical value. The calibrated kinetic parameters of the HAc-uptake and phosphorus-release model were evaluated as follows: Q HAc,max was 164 mg/(g · h), Q P,max was 69.9 mg/(g · h), K gly was 0.005, and KCOD was 3 mg/L. An apparently linear correlation was observed between the ratio of Δρ P/ΔCOD and pH of the solution, and the equation between them was obtained in this study. 相似文献
296.
大红色基G生产中产生的废硫酸内含硫酸达50%,COD70g/L,难用常规的方法来处理。本文给出了用该废酸生产硫酸锌进而生产立德粉的方法,并用COD浓度作为硫酸锌质量的控制指标,氧化锌和了废硫酸后,有机会物从溶液中析了,COD的去除率达99%。残存的有机物用活性炭吸附法除去。控制ZnSO4溶液中COD≤60mg/L,可制得合格的B301立德粉。有杉本法使硫酸资源全部回收并且无废水排放。 相似文献
297.
An orthogonally designed experiment was conducted to study the single and combined effects of N, P and K on phytoremediation of Cu-polluted soil by Indian mustard. Addition of fertilizer N and P significantly increased Indian mustard shoot yield. Two high treatments combined with N resulted in the highest yields, followed by low-P combined with N. In contrast, high P with no N gave no yield increase and K had no effect on yield of Indian mustard. Nitrogen and P increased the amount of chlorophyll in the leaves, indicating that the yield increases were due to enhanced photosynthesis. Nitrogen application had no effect on plant Cu concentrations but addition of P slightly decreased plant Cu concentrations, likely a dilution effect resulting from the increase in yield. Among the treatments, N and P applied at 100 and 200 mg kg–1 respectively with no K application resulted in the highest Cu uptake. Thus, a combination of low N and high P produced a yield increase in Indian mustard that was more than adequate to compensate for a slight decrease in Cu concentration, resulting in the highest Cu removal from the contaminated soil. 相似文献
298.
铝对茶叶叶片主要化学成分的影响 总被引:1,自引:0,他引:1
以茶树2个品种(雁荡毛峰和知仁早茶)为研究材料,采用溶液培养法,研究了铝对茶叶叶片主要化学成分(茶多酚、咖啡碱、氨基酸和维生素C)的影响。结果表明,水培下,10~100mg·L-1质量浓度的铝可显著提高茶多酚的质量分数,与对照相比,50mg·L-1质量浓度下雁荡毛峰茶多酚的质量分数提高了180%,知仁早茶提高了100.6%;10~50mg·L-1质量浓度的铝可提高咖啡碱、氨基酸的质量分数,但100mg·L-1质量浓度下显著降低了咖啡碱和氨基酸的质量分数,雁荡毛峰降低了5.3%、25.8%,知仁早茶降低了2%、7.2%;不同质量浓度的铝对维生素C的质量分数影响不大;低质量浓度的铝处理降低茶树的丙二醛质量分数,而高质量浓度的铝处理(100mg·L-1)提高了丙二醛质量分数。结果证明水培条件下,10~50mg·L-1铝可明显提高茶叶品质,100mg·L-1质量浓度会降低茶叶品质。 相似文献
299.
300.
阪神地震中地下结构和隧道的破坏现象浅析 总被引:8,自引:0,他引:8
概述了阪神地震中地铁车站和地下隧道所造成的破坏情况,说明了地下结构较之于地面结构具有更为良好的抗震性能,同时也说明在地下结构的抗震设计中应认真研究直下型地震的强地面运动破坏作用。 相似文献