全文获取类型
收费全文 | 922篇 |
免费 | 138篇 |
国内免费 | 603篇 |
专业分类
安全科学 | 64篇 |
废物处理 | 37篇 |
环保管理 | 137篇 |
综合类 | 1023篇 |
基础理论 | 145篇 |
污染及防治 | 128篇 |
评价与监测 | 91篇 |
社会与环境 | 28篇 |
灾害及防治 | 10篇 |
出版年
2024年 | 7篇 |
2023年 | 35篇 |
2022年 | 64篇 |
2021年 | 94篇 |
2020年 | 94篇 |
2019年 | 86篇 |
2018年 | 86篇 |
2017年 | 46篇 |
2016年 | 72篇 |
2015年 | 80篇 |
2014年 | 72篇 |
2013年 | 85篇 |
2012年 | 71篇 |
2011年 | 68篇 |
2010年 | 54篇 |
2009年 | 76篇 |
2008年 | 57篇 |
2007年 | 82篇 |
2006年 | 56篇 |
2005年 | 50篇 |
2004年 | 30篇 |
2003年 | 33篇 |
2002年 | 31篇 |
2001年 | 40篇 |
2000年 | 38篇 |
1999年 | 16篇 |
1998年 | 21篇 |
1997年 | 19篇 |
1996年 | 23篇 |
1995年 | 14篇 |
1994年 | 6篇 |
1993年 | 13篇 |
1992年 | 10篇 |
1991年 | 5篇 |
1990年 | 5篇 |
1989年 | 6篇 |
1988年 | 2篇 |
1987年 | 4篇 |
1986年 | 3篇 |
1985年 | 2篇 |
1984年 | 1篇 |
1981年 | 1篇 |
1979年 | 2篇 |
1971年 | 3篇 |
排序方式: 共有1663条查询结果,搜索用时 15 毫秒
921.
设计三因素三水平实验并采用响应面优化法对反应适宜的实验参数进行了优化.选择温度、供氧条件和反应时间作为菌剂制备的可控因素,选择温度、菌剂投加量和木屑投加量(水分调节)作为菌剂处理厨余垃圾的可控因素,研究菌剂制备与处理垃圾的优化工艺参数.研究结果表明,菌剂的最优制备条件为:温度35℃、间歇震荡、培养108 h,按重量百分比为碎花生壳∶刨花∶鱼骨粉∶麸皮∶菌体=2∶1∶1∶1∶1比例制得的固体菌剂具有较高的活性.菌剂处理厨余垃圾的响应面优化法分析结果表明,当温度为45℃,菌剂投加量为6%,木屑投加量为30%时,厨余垃圾的减量率最大,2d降解率可达40%. 相似文献
922.
923.
AYRTON FIGUEIREDO MARTINS DANIELLE MARRANQUIEL HENRIQUES MARCELO LUIS WILDE TIBIRIÇÁ GONÇALVES VASCONCELOS 《Journal of environmental science and health. Part. B》2013,48(3):245-252
The treatment of an effluent from the production of trifluraline was studied using a 1-L, semi-batch, tank-stirred glass reactor for performing three different advanced oxidation processes (photoperoxidation, Fenton, photo-Fenton). A commercial, medium-pressure mercury lamp was used for sample irradiation. The degradation was monitored by measurements of absorptiometric color reduction, UV-visible absorption spectra, and chemical oxygen demand (COD). The obtained results showed that the photo-Fenton process was the most effective treatment for the trifluraline effluent. 相似文献
924.
925.
Po-Min Kao Chi-Wei Tao Tsui-Kang Hsu Chia-Ming Chang 《International Journal of Green Energy》2016,13(10):977-982
In this study, we evaluated biohydrogen production of Clostridium butyricum and Rhodopseudomonas palustris by immobilized co-culture. Effects of free cells and immobilized cells, immobilized biomass ratio, sucrose concentration, and initial pH on hydrogen production were investigated. The immobilized co-culture can achieve high cumulative hydrogen volume yield (604 mL) as compared to free co-culture cumulative hydrogen volume (513 mL) while the initial sucrose concentration was 17.8 g/L. The optimum C. butyricum/R. palustris ratio was 1:10, yielding the highest cumulative hydrogen (728 mL). High sucrose concentration (above 35.6 g/L) would inhibit hydrogen production. The optimal initial pH value for hydrogen production of immobilized co-culture was 7.0 (cumulative hydrogen volume 830 mL). 相似文献
926.
927.
UV/TiO2/H2O2, UV/TiO2 and UV/H2O2 were compared as pre-treatment processes for the detoxification of mixtures of 4-chlorophenol (4CP), 2,4-dichlorophenol (DCP), 2,4,6-trichlorophenol (TCP) and pentachlorophenol (PCP) prior to their biological treatment. When each chlorophenol was initially supplied at 50 mg l−1, UV/TiO2/H2O2 treatment supported the highest pollutant removal, COD removal, and dechlorination efficiencies followed by UV/TiO2 and UV/H2O2. The remaining toxicity to Lipedium sativum was similar after all pre-treatments. Chlorophenol photodegradation was always well described by a first order model kinetic (r2 > 0.94) and the shortest 4CP, DCP, TCP and PCP half-lives of 8.7, 7.1, 4.5 and 3.3 h, respectively, were achieved during UV/TiO2/H2O2 treatment. No pollutant removal was observed in the controls conducted with H2O2 or TiO2 only. Inoculation of all the photochemically pre-treated mixtures with activated sludge microflora was followed by complete removal of the remaining pollutants. Combined UV/TiO2/H2O2-biological supported the highest detoxification, dechlorination (99%) and COD removal (88%) efficiencies. Similar results were achieved when each chlorophenol was supplied at 100 mg l−1. COD and Cl mass balances indicated UV, UV/H2O2, and UV/TiO2 treatments lead to the formation of recalcitrant photoproducts, some of which were chlorinated. 相似文献
928.
Dissolved oxygen (DO) left in the voids of buffer and backfill materials of a deep geological high level radioactive waste (HLW) repository could cause canister corrosion. Available data from laboratory and in situ experiments indicate that microbes play a substantial role in controlling redox conditions near a HLW repository. This paper presents the application of a coupled hydro-bio-geochemical model to evaluate geochemical and microbial consumption of DO in bentonite porewater after backfilling of a HLW repository designed according to the Swedish reference concept. In addition to geochemical reactions, the model accounts for dissolved organic carbon (DOC) respiration and methane oxidation. Parameters for microbial processes were derived from calibration of the REX in situ experiment carried out at the Asp? underground laboratory. The role of geochemical and microbial processes in consuming DO is evaluated for several scenarios. Numerical results show that both geochemical and microbial processes are relevant for DO consumption. However, the time needed to consume the DO trapped in the bentonite buffer decreases dramatically from several hundreds of years when only geochemical processes are considered to a few weeks when both geochemical reactions and microbially-mediated DOC respiration and methane oxidation are taken into account simultaneously. 相似文献
929.
Export of nitrogen from catchments: a worldwide analysis 总被引:2,自引:0,他引:2
Alvarez-Cobelas M Angeler DG Sánchez-Carrillo S 《Environmental pollution (Barking, Essex : 1987)》2008,156(2):261-269
This study reviews nitrogen export rates from 946 rivers of the world to determine the influence of quantitative (runoff, rainfall, inhabitant density, catchment area, percentage of land use cover, airborne deposition, fertilizer input) and qualitative (dominant type of forest, occurrence of stagnant waterbodies, dominant land use, occurrence of point sources, runoff type) environmental factors on nitrogen fluxes. All fractions (total, nitrate, ammonia, dissolved organic and particulate organic) of nitrogen export showed a left-skewed distribution, which suggests a relatively pristine condition for most systems. Total nitrogen export showed the highest variability whereas total organic nitrogen export comprised the dominant fraction of export. Nitrogen export rates were only weakly explained by our qualitative and quantitative environmental variables. Our study suggests that the consideration of spatial and temporal scales is important for predicting nitrogen export rates using simple and easy-to-get environmental variables. Regionally based modelling approaches prove more useful than global-scale analyses. 相似文献
930.
Schipper AM Wijnhoven S Leuven RS Ragas AM Hendriks AJ 《Environmental pollution (Barking, Essex : 1987)》2008,151(1):17-26
Soil metal concentrations, inundation characteristics and abundances of 14 arthropod taxa were investigated in a moderately contaminated lowland floodplain along the Rhine River and compared to the hinterland. Internal metal concentrations were determined for the orders of Coleoptera (beetles) and Araneida (spiders) and were related to soil concentrations. The floodplain was characterized by larger arthropod abundance than the hinterland, in spite of recurrent inundations and higher soil metal concentrations. Most arthropod taxa showed increasing abundance with decreasing distance to the river channel and increasing average inundation duration. For Cd, Cu, Pb and Zn, significant relations were found between arthropod concentrations and concentrations in soil. Significant relations were few but positive, indicating that increasing soil concentrations result in increasing body burdens in arthropods. For arthropod-eating vertebrates, these results might imply that larger prey availability in the floodplain coincides with higher metal concentrations in prey, possibly leading to increased exposure to metal contamination. 相似文献