全文获取类型
收费全文 | 5968篇 |
免费 | 605篇 |
国内免费 | 1913篇 |
专业分类
安全科学 | 615篇 |
废物处理 | 246篇 |
环保管理 | 440篇 |
综合类 | 3931篇 |
基础理论 | 876篇 |
环境理论 | 2篇 |
污染及防治 | 1257篇 |
评价与监测 | 368篇 |
社会与环境 | 415篇 |
灾害及防治 | 336篇 |
出版年
2024年 | 24篇 |
2023年 | 133篇 |
2022年 | 380篇 |
2021年 | 308篇 |
2020年 | 310篇 |
2019年 | 230篇 |
2018年 | 247篇 |
2017年 | 259篇 |
2016年 | 287篇 |
2015年 | 333篇 |
2014年 | 412篇 |
2013年 | 538篇 |
2012年 | 545篇 |
2011年 | 535篇 |
2010年 | 448篇 |
2009年 | 417篇 |
2008年 | 414篇 |
2007年 | 413篇 |
2006年 | 453篇 |
2005年 | 319篇 |
2004年 | 199篇 |
2003年 | 178篇 |
2002年 | 180篇 |
2001年 | 137篇 |
2000年 | 163篇 |
1999年 | 110篇 |
1998年 | 75篇 |
1997年 | 90篇 |
1996年 | 81篇 |
1995年 | 60篇 |
1994年 | 59篇 |
1993年 | 35篇 |
1992年 | 33篇 |
1991年 | 24篇 |
1990年 | 17篇 |
1989年 | 12篇 |
1988年 | 11篇 |
1987年 | 6篇 |
1986年 | 2篇 |
1985年 | 3篇 |
1984年 | 1篇 |
1982年 | 3篇 |
1981年 | 2篇 |
排序方式: 共有8486条查询结果,搜索用时 31 毫秒
81.
82.
水解酸化—厌氧工艺处理高浓度抗生素废水研究 总被引:10,自引:0,他引:10
研究了水解酸化与厌氧消化组合工艺处理高浓度抗生素废水,结果表明,水解酸化反应器最大CODcr容积负荷达到 16.84kg/m3·d,复合厌氧反应器CODcr容积负荷达到8.57kg/m3·d;系统进水SO42-浓度为1325mg/L,CODcr/SO42-值最低达到 3;CODCr与SO42-总去除率分别为75.5%和95.2%,对各种抑制物质和冲击负荷表现出很好的适应性。 相似文献
83.
在地震观测中,环境保护是非常重要的,可是随着改革开放后我国经济的飞速发展,各级政府在进行经济建设的过程中,很多地方地震观测环境受到很大的影响。我们江苏省宿迁地震台的观测环境目前就处在这种境况之中,这给我们的数据采集带来了很大的影响。本文从我台环境受影响的现状、国家的法律法规、解决的思路等方面探讨问题的解决办法。 相似文献
84.
Recovery of heavy metals from electroplating sludge and stainless steel pickle waste liquid by ammonia leaching method 总被引:2,自引:0,他引:2
1 IntroductionElectroplatingsludge,containingCu,Ni,Zn,Cr,Fe,etc.,isharmfulwastematerialproducedbygalvanizationindustry.Thereisstillnoeffectivemethodtorecoverresourceandcontrolpollutionbothathomeandabroad.Themetalsdiscardedbygalvanizationindustryamoun… 相似文献
85.
环境监测作为环境管理的重要手段之一,在经济发展过程中,我们应了解环境监测在经济建设中的地位和作用,充分有效的利用环境监测的成果,使之为经济发展服务。 相似文献
86.
The feasibility of decomplexation removal of typical contaminants in electroplating wastewater, complexed Cu(II) with 1-hydroxyethylidene-1,1-diphosphonic acid (Cu-HEDP), was first performed by a three-dimensional electric
reactor with activated biochar as particle electrodes. For the case of 50 mg/L Cu-HEDP, Cu(II) removal (90.7%) and PO
initial pH 7, acid-treated almond shell biochar (AASB) addition 20 g/L, and reaction time 180 min, with second-order rate constants of 1.10 × 10−3 and 1.94 × 10−5 min−1respectively. The growing chelating effect between Cu(II) and HEDP and the comprehensive actions of adsorptive accumulation, direct and indirect oxidation given by particle electrodes accounted for the enhanced removal of Cu-HEDP, even though the mineralization of HEDP was mainly dependent on anode oxidation. The performance attenuation of AASB particle electrodes was ascribed to the excessive consumption of oxygen-containing functionalities during the reaction, especially acidic carboxylic groups and quinones on particle electrodes, which decreased from 446.74 to 291.48 µmol/g, and 377.55 to 247.71 µmol/g, respectively. Based on the determination of adsorption behavior and indirect electrochemical oxidation mediated by in situ electrogenerated H2O2 and reactive oxygen species (e.g., •OH), a possible removal mechanism of Cu-HEDP by three-dimensional electrolysis was further proposed. 相似文献
87.
88.
89.
90.
Numerous studies support that biodiversity predict most to ecosystem functioning, but whether other factors display a more significant direct impact on ecosystem functioning than biodiversity remains to be studied. We investigated 398 samples of the phytoplankton phosphorus resource use efficiency (RUEP = chlorophyll-a concentration/dissolved phosphate) across two seasons in nine plateau lakes in Yunnan Province, China. We identified the main contributors to phytoplankton RUEP and analyzed their potential influences on RUEP at different lake trophic states. The results showed that total nitrogen (TN) contributed the most to RUEP among the nine lakes, whereas community turnover (measured as community dissimilarity) explained the most to RUEP variation across the two seasons. Moreover, TN also influenced RUEP by affecting biodiversity. Species richness (SR), functional attribute diversity (FAD2), and dendrogram-based functional diversity (FDc) were positively correlated with RUEP in both seasons, while evenness was negatively correlated with RUEP at the end of the rainy season. We also found that the effects of biodiversity and turnover on RUEP depended on the lake trophic states. SR and FAD2 were positively correlated with RUEP in all three trophic states. Evenness showed a negative correlation with RUEP at the eutrophic and oligotrophic levels, but a positive correlation at the mesotrophic level. Turnover had a negative influence on RUEP at the eutrophic level, but a positive influence at the mesotrophic and oligotrophic levels. Overall, our results suggested that multiple factors and nutrient states need to be considered when the ecosystem functioning predictors and the biodiversity-ecosystem functioning relationships are investigated. 相似文献