全文获取类型
收费全文 | 12170篇 |
免费 | 20篇 |
国内免费 | 33篇 |
专业分类
安全科学 | 75篇 |
废物处理 | 897篇 |
环保管理 | 1462篇 |
综合类 | 1381篇 |
基础理论 | 3629篇 |
环境理论 | 2篇 |
污染及防治 | 2484篇 |
评价与监测 | 1219篇 |
社会与环境 | 1054篇 |
灾害及防治 | 20篇 |
出版年
2023年 | 30篇 |
2022年 | 88篇 |
2021年 | 107篇 |
2020年 | 52篇 |
2019年 | 43篇 |
2018年 | 1521篇 |
2017年 | 1434篇 |
2016年 | 1286篇 |
2015年 | 196篇 |
2014年 | 135篇 |
2013年 | 178篇 |
2012年 | 579篇 |
2011年 | 1493篇 |
2010年 | 789篇 |
2009年 | 698篇 |
2008年 | 984篇 |
2007年 | 1318篇 |
2006年 | 79篇 |
2005年 | 137篇 |
2004年 | 186篇 |
2003年 | 210篇 |
2002年 | 191篇 |
2001年 | 90篇 |
2000年 | 45篇 |
1999年 | 36篇 |
1998年 | 23篇 |
1997年 | 26篇 |
1996年 | 16篇 |
1995年 | 23篇 |
1994年 | 18篇 |
1993年 | 8篇 |
1992年 | 11篇 |
1991年 | 16篇 |
1990年 | 9篇 |
1989年 | 11篇 |
1988年 | 5篇 |
1987年 | 10篇 |
1986年 | 8篇 |
1985年 | 11篇 |
1984年 | 21篇 |
1983年 | 17篇 |
1982年 | 5篇 |
1981年 | 7篇 |
1979年 | 8篇 |
1975年 | 3篇 |
1970年 | 3篇 |
1966年 | 3篇 |
1964年 | 4篇 |
1961年 | 3篇 |
1935年 | 3篇 |
排序方式: 共有10000条查询结果,搜索用时 15 毫秒
121.
Natija Barhoumi Nihal Oturan Salah Ammar Abdellatif Gadri Mehmet A. Oturan Enric Brillas 《Environmental Chemistry Letters》2017,15(4):689-693
There is actually increasing concern about the accumulation of antibiotics, such as tetracycline, in soil and water bodies. There is therefore a need for efficient methods to degrade antibiotics and thus clean waters. Here we tested the degradation of tetracycline using the heterogeneous electro-Fenton-pyrite method and compared the results with the conventional electro-Fenton method. The reaction was performed with a boron-doped diamond or Pt anode and carbon-felt cathode allowing electrogeneration of H2O2 from O2 reduction. Results show an increasing tetracycline mineralization using the following methods: anodic oxidation with electrogenerated H2O2, electro-Fenton and then electro-Fenton-pyrite using boron-doped diamond. Ion-exclusion HPLC revealed the complete removal of malic malonic, succinic, acetic, oxalic and oxamic acids. Nitrogen present in tetracycline was mainly mineralized in NH4 +. The higher efficiency of electro-Fenton-pyrite is explained by self-regulation of soluble Fe2+ and pH to 3.0 from pyrite catalyst favoring larger ·OH generation from Fenton’s reaction. 相似文献
122.
Ilton Curty Leal Junior Márcio de Almeida D'Agosto 《Journal of Cleaner Production》2011,19(2-3):229-240
Performance evaluation is important in managing freight transport. The transport of certain products, especially those that are hazardous, can have significant financial and socio-environmental impacts. This article presents an application of the modal choice method (MCM) to establish an order of priority among the alternatives considered to carry a determined hazardous product. After a research of the literature on the concepts and development of the proposed method, we consulted experts about their experiences and knowledge, to determine a set of relevant attributes for the evaluation process. We then applied this method to the specific case of the Brazilian bio-ethanol industry, to demonstrate the potential of using the MCM as a tool to support make decisions. We can conclude that highway transport, though the most often used, is not the best compared to trains or pipelines (or combinations of any of the three) from a socio-environmental standpoint. Alternatives with longer pipeline segments are the most suitable to replace the current practice in environmental terms. 相似文献
123.
Tatiana Calvete Eder C. Lima Natali F. Cardoso Júlio C.P. Vaghetti Silvio L.P. Dias Flavio A. Pavan 《Journal of environmental management》2010,91(8):1695-1706
Activated (AC-PW) and non-activated (C-PW) carbonaceous materials were prepared from the Brazilian-pine fruit shell (Araucaria angustifolia) and tested as adsorbents for the removal of reactive orange 16 dye (RO-16) from aqueous effluents. The effects of shaking time, adsorbent dosage and pH on the adsorption capacity were studied. RO-16 uptake was favorable at pH values ranging from 2.0 to 3.0 and from 2.0 to 7.0 for C-PW and AC-PW, respectively. The contact time required to obtain the equilibrium using C-PW and AC-PW as adsorbents was 5 and 4 h at 298 K, respectively. The fractionary-order kinetic model provided the best fit to experimental data compared with other models. Equilibrium data were better fit to the Sips isotherm model using C-PW and AC-PW as adsorbents. The enthalpy and entropy of adsorption of RO-16 were obtained from adsorption experiments ranging from 298 to 323 K. 相似文献
124.
Alamgir Hossain Jamal Naser Monzur Alam Imteaz 《Environmental Modeling and Assessment》2011,16(4):359-367
This paper presents comprehensive 3D numerical investigations on depositions of particles flowing through a horizontal pipe
loop consisting of four bends. The multiphase mixture model available in FLUENT 6.2 was used in this study. In this numerical
simulation, five different particle sizes have been used as secondary phases to calculate real multiphase effect in which
inter-particle interaction has been considered. The deposition of particles along the periphery of the pipe wall was investigated
as a function of particle size and fluid velocity. The simulations showed that near the upstream of the bends, maximum particle
concentration occurred at the bottom of the pipe. However, downstream the bends, the maximum particle concentration occurred
at an angle of 60° from the bottom. The larger particles clearly showed deposition near the bottom wall except downstream.
As expected, the smaller particles showed less tendency of deposition and lesser at higher velocity. This numerical investigation
showed qualitative agreement with the experiments conducted by Commonwealth Scientific and Industrial Research Organisation,
Melbourne team for similar conditions. 相似文献
125.
Konstantinos C. Makris Dibyendu Sarkar Jason Salazar Pravin Punamiya Rupali Datta 《Environmental science and pollution research international》2010,17(1):195-202
Background, aim, and scope
Alum (aluminum sulfate) is the currently preferred chemical amendment for phosphorus (P) treatment in poultry litter (PL). Aluminum-based drinking-water treatment residuals (Al-WTRs) are the waste by-product of the drinking-water treatment process and have been effectively used to remove P from aqueous solutions, but their effectiveness in PL water extracts has not been studied in detail. Elevated cost associated with alum could be minimized by using the equally effective WTRs to remove soluble P from PL, and they can be obtained at a minimal cost from drinking-water treatment plants. 相似文献126.
Leila Mehrparvar Siyamak Safapour Mousa Sadeghi-Kiakhani Kamaladin Gharanjig 《Environmental Chemistry Letters》2016,14(4):533-539
The classical use of synthetic dyes is causing issues of environmental pollution and heath risk. As a consequence natural dyes are gaining interest, but the use of natural dyes still includes toxic reagents such as metals as mordants and acids to enhance color and yield. Therefore, we designed a new chitosan-polypropylene imine dendrimer hybrid at 0–2000 mg/L to treat wool before dyeing with cochineal. We compared dye exhaustion, color depth, color characteristics, and color fastness of the new process with dyed pristine and metal mordanted wool. Results show that wool pretreatment improved dye exhaustion from 48 to 88 %, shifted saturation point toward lower dye concentration from 3000 to 1000 mg/L, and improved color depth from 13.68 for pristine wool and 15.17 for metal mordanted wool to 23.89 for the new process. 相似文献
127.
International environmental agreements (IEAs) can coordinate abatement of transboundary pollutants. This paper investigates
how heterogeneous countries facing a stock pollutant might structure such an agreement. In particular, we examine how an IEA
might be implemented with a set of monetary transfers. The focus is on transfers that are time invariant, linear in emissions,
and consistent with budget balance. There is a range of such schemes that would induce efficient emissions. We provide a simple
and intuitive characterization of these penalties and describe how specific proposals might be chosen in order to facilitate
compliance and implementation. Our proposals are illustrated with a simple example. We show that heterogeneity reduces the
scope for penalty schemes to jointly satisfy desirable properties. 相似文献
128.
Kazuharu Yoshizuka Syouhei Nishihama Hideki Sato 《Environmental geochemistry and health》2010,32(4):297-302
The objective of this study was to survey the cation and anion contents of geothermal waters to gather fundamental information
on geographical variations. Sixteen sites in hot spring areas on the island of Kyushu in Japan were studied. The study focused
on the arsenic content of the samples. Very high arsenic concentrations (more than 0.1 mg/l) were detected in most of the
geothermal waters sampled. High contents of boron and fluoride (more than 1.0 mg/l) were also detected in some samples. Arsenic
removal was performed on a laboratory scale using columns packed with a magnetite-type adsorbent. The reduction of arsenic
contamination to a concentration of less than 0.01 mg/l could be achieved in the early stages of adsorption (bed volume = 200). 相似文献
129.
João G.R. Giovanelli Marinez Ferreira de Siqueira João Alexandrino 《Ecological modelling》2010,221(2):215-170
We here examine species distribution models for a Neotropical anuran restricted to ombrophilous areas in the Brazilian Atlantic Forest hotspot. We extend the known occurrence for the treefrog Hypsiboas bischoffi (Anura: Hylidae) through GPS field surveys and use five modeling methods (BIOCLIM, DOMAIN, OM-GARP, SVM, and MAXENT) and selected bioclimatic and topographic variables to model the species distribution. Models were first trained using two calibration areas: the Brazilian Atlantic Forest (BAF) and the whole of South America (SA). All modeling methods showed good levels of predictive power and accuracy with mean AUC ranging from 0.77 (BIOCLIM/BAF) to 0.99 (MAXENT/SA). MAXENT and SVM were the most accurate presence-only methods among those tested here. All but the SVM models calibrated with SA predicted larger distribution areas when compared to models calibrated in BAF. OM-GARP dramatically overpredicted the species distribution for the model calibrated in SA, with a predicted area around 106 km2 larger than predicted by other SDMs. With increased calibration area (and environmental space), OM-GARP predictions followed changes in the environmental space associated with the increased calibration area, while MAXENT models were more consistent across calibration areas. MAXENT was the only method that retrieved consistent predictions across calibration areas, while allowing for some overprediction, a result that may be relevant for modeling the distribution of other spatially restricted organisms. 相似文献
130.