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101.
A. Delgado-Lima G. Botelho M. M. Silva A. V. Machado 《Journal of Polymers and the Environment》2013,21(3):710-717
The stability of PCL/TiO2 nanocomposites under different environments was investigated. Samples were exposed to UV radiation in an accelerated weathering chamber equipment and characterized by viscosimetry and differential scanning calorimetry. The results showed that the presence of nanoparticles containing titanium enhanced polymer chain scission during UV exposure. For all samples, the melting temperature and crystallinity increased along photodegradation time. The biodegradability, assessed by biochemical oxygen demand, increased as the amount of inorganic particles increased. However, the thermal stability and activation energy evaluated by thermogravimetric analysis decreased as the amount of inorganic nanoparticles increased, indicating that nanocomposites exhibited lower thermal stability. 相似文献
102.
Joaquim C.G. Esteves da Silva Adélio A.S.C. Machado Marta S.S.D.S. Pinto 《Journal of environmental science and health. Part. B》2013,48(4):469-482
Abstract The fulvic acid (fua) fractions of two samples of composted solid wastes [urban (urfua) and livestock (lsfua) wastes], commercialized to be used in agriculture as organic correctives or fertilizers, were analyzed for their affinity towards Cu(II) at pH=6. Molecular fluorescence spectroscopy (synchronous mode) was used to monitor the quenching caused by the complexation upon addition of Cu(II) to fua. Spectral data were preprocessed by a chemometric self‐modeling mixture analysis method (SIMPLISMA) to detect the number of different types of fluorescent binding sites that exist in each fua, their spectra and the corresponding quenching profiles [fluorescence intensity as function of the total Cu(II) concentration]. From the analysis of the quenching profiles, the amount of binding sites (Cl) and the corresponding conditional stability constants (K') were calculated. Both fua samples have approximately Cl = 0.21 mmol/g and the logarithms of K’ are 4.21(3) and 4.51(8), respectively for urfua and lsfua. The differences detected between these fua samples and those extracted from natural soils can be attributed mainly to the relatively small humification extent of the present anthropogenic fua samples. 相似文献
103.
Tania Basegio Andréa Machado Andréa Moura Bernardes Carlos Pérez Bergmann 《Waste management & research》2006,24(6):537-544
In this study, the viability of using electrostatic painting residues--paint sludge--as a raw material to the red clay industry was investigated. Red clay-based ceramic masses containing electrostatic paint residues were formulated during the study. The clays were obtained from the Rio do Rastro deposit, in Gravataí, and were of the standard formulation used in industry. Different ceramic mass formulations with additions of 0.5, 1.0, 2.5 and 5.0 wt.% electrostatic painting residue in addition to a formulation with no residue addition (standard formulation), were evaluated. The samples were uniaxially pressed in a double-effect press and were fired in an electric oven at 900, 950 and 1000 degrees C. The firing at constant temperature lasted 8 h, and heating rate was 150 K h(-1). After processing the samples were characterized in terms of their physical and mechanical properties. Environmental compatibility was also considered by the evaluation of gaseous emissions and leaching and solubilization tests according to the Brazilian standards NBR 10.005 and NBR 10.006, respectively. The results showed that it was possible to produce ceramic materials containing electrostatic painting residues within their formulations. 相似文献
104.
105.
de Queiroz Machado Diego Matos Fátima Regina Ney de Mesquita Rafael Fernandes 《Environment, Development and Sustainability》2022,24(9):11127-11152
Environment, Development and Sustainability - The objective of this work was to analyse the relations between innovation management and organisational sustainability in a Brazilian higher education... 相似文献
106.
Energy and Carbon Embodied in the International Trade of Brazil 总被引:4,自引:0,他引:4
Tolmasquim M.T. Machado G. 《Mitigation and Adaptation Strategies for Global Change》2003,8(2):139-155
Shifting the economicstructure of a country towardsenergy-intensive industries may lead tosignificant effect on the environment. Oneof the major environmental impactsassociated to such changes is the increaseof the Carbon Dioxide emissions – the mainfactor behind the greenhouse effect. In thelast decades, structural changes in theBrazilian economy were close related tochanges in the country's tradespecialization. This paper analyzes to whatextent energy use and its associatedCO2 emissions of Brazil in the 90's maybe overloaded by changes in the country'strade specialization towards a moreenergy-intensive mix. This study finds thatBrazil exported, in net terms, significantamounts of energy and carbon (C) embodied ingoods traded with the rest of the world inthe 90's. In fact, some 6.6% of the finalenergy used by the industrial sector andaround 7.1% of its C emissions areprompted by international trade. Byoverloading the country's energy use andits associated environmental damage (bothlocal and global), this situation seems tocontribute to increase not only local butalso global environmental damage, sinceC leakage from non-Annex I countriesdue to international trade may lead tohigher C concentration in theatmosphere. 相似文献
107.
Carvalhaes GK Brooks P Marques CG Azevedo JA Machado MC Azevedo GC 《Chemosphere》2002,46(9-10):1413-1416
After an exhaustive investigation, in 1997 the source of the milk contamination in Germany was traced to citrus pulp pellets originating from Brazil. It has been shown that lime was the source of the PCDD/F contamination of these products. After this conclusion, a continuous monitoring program has been performed over a two year period and the results are presented in this paper. Standard isotope dilution techniques were used for all samples, which were analyzed by selected ion monitoring high resolution GC–MS. 相似文献
108.
Machado AF Jakelaitis A Ferreira LR Agnes EL Santos LD 《Journal of environmental science and health. Part. B》2005,40(1):119-128
Population dynamics of weeds in successive maize and bean crops were evaluated in two soil management systems (conventional and no-tillage), for two maize applications (grain and silage), and in four consecutive growing seasons. Every year, conventional tillage consisted in plowing and harrowing before sowing. In no-tillage, chemical weed desiccation was made with the mixture glyphosate + 2.4-D. To control weeds, the mixture fluazifop-p-butil + fomesafen was applied on the bean crop in all the planting seasons, and the herbicides nicosulfuron + atrazine on maize after crop emergence (1998--1999, 1999--2000, 2001--2002) and atrazine + metolachlor before emergence (2000--2001). Purple nutsedge (Cyperus rotundus) was the most important species under conventional soil tillage; while in no-tillage the dicotyledonous weed species (Amaranthus deflexus, Bidens pilosa, Euphorbia heterophylla, Galinsoga parviflora Ipomoea grandifolia) were the most relevant. Regardless of the maize use, the C. rotundus population and tuber bank, with prevailingly dormant tubers, was considerably reduced in no-tillage compared with the conventional system. 相似文献
109.
Juliana da Silva Ribeiro de Andrade Tulio Machado Fumian José Paulo Gagliardi Leite Matheus Ribeiro de Assis Alexandre Madi Fialho Sergio Mouta Cristiane Mendes Pereira Santiago Marize Pereira Miagostovich 《Food and environmental virology》2018,10(2):212-216
Foodborne transmission gastroenteritis (AGE) outbreak occurred during a celebration lunch in July, 2016, Brazil. All stool samples tested were positive for noroviruses (NoV) and phylogenetic analysis revealed that strains were genetically close to GII.17 Kawasaki_2014. These findings indicated circulation of NoV GII.17 Kawasaki_2014 in the Brazilian population, associated with AGE outbreak. 相似文献
110.
Matheus Ribeiro da Silva Assis Carmen Baur Vieira Julia Monassa Fioretti Mônica Simões Rocha Pedro Ivo Neves de Almeida Marize Pereira Miagostovich Tulio Machado Fumian 《Food and environmental virology》2016,8(4):305-309
Gemycircularvirus (GemyCV) is a group of viruses which has been recently proposed as a new viral genus detected in fecal and environmental samples around the world. GemyCVs have been detected in human blood, brain tissue, cerebrospinal fluid, and stool sample. In the present study, we demonstrate for the first time, through molecular detection and characterization, the presence of GemyCVs in environmental samples from Brazil. Our results show a percentage of positivity ranging from 69 (25/36) to 97 % (35/36) in river water samples collected in Manaus, Amazon region, and wastewater from a wastewater treatment plant located in Rio de Janeiro, respectively, revealing GemyCVs as an important environmental contaminant. 相似文献