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Search Results: 1 - 10 of 282782 matches for " Milady R. Apolinário da;Nogueira "
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Potencial de aplica??o do processo foto-fenton/solar como pré-tratamento de efluente da indústria de laticínios
Villa, Ricardo Dalla;Silva, Milady R. Apolinário da;Nogueira, Raquel F. Pupo;
Química Nova , 2007, DOI: 10.1590/S0100-40422007000800002
Abstract: dairy wastewater is characterized by frequent episodes of drastic increases of organic content, giving rise to bulking filamentous bacteria and compromising the biological treatment process. this study reports the reduction of organic content of such wastewater by the application of the solar photo-fenton process. for a wastewater containing 335, 2627 or 5400 mg c l-1 between 90% and 50% of the organic carbon content were removed after 3.5 h irradiation. the results show that the solar photo-fenton process can be a good alternative for the abatement of organic content of dairy wastewater, especially in cases of organic content fluctuation, allowing an efficient biological treatment.
TiO2/CuO Films Obtained by Citrate Precursor Method for Photocatalytic Application  [PDF]
Leinig Perazolli, Luciana Nu?ez, Milady Renata Apolinário da Silva, Guilherme Francisco Pegler, Ademir Geraldo Cavalarri Costalonga, Rossano Gimenes, Márcia Matiko Kondo, Maria Aparecida Zaghete Bertochi
Materials Sciences and Applications (MSA) , 2011, DOI: 10.4236/msa.2011.26075
Abstract: In the present work, the hybrid catalyst films of TiO2/CuO containing up to 10% in mol of copper were deposited onto glass surface. Precursor solutions were obtained by citrate precursor method. Films were porous and the average particle size was 20 nm determined by FEG-SEM analysis. The photocatalytic activities of these films were studied using Rhodamine B as a target compound in a fixed bed reactor developed in our laboratory and UV lamp. It was observed that the addition of copper to TiO2 increased significantly its photocatalytic activity during the oxidation of Rhodamine B. The degradation exceeded 90% within 48 hours of irradiation compared to 38% when pure TiO2 was used. Moreover, there was a reduction in the particles band gap energy when compared to that of pure TiO2. These results indicate that the TiO2/CuO films are promising catalysts for the development of fixed bed reactors to be used to treat effluents containing azo dyes.
Degradation of Abamectin Using the Photo-Fenton Process
Thiago Augusto de Freitas Matos,Alexandra Lemos Nunes Dias,Amanda Di Piazza Reis,Milady Renata Apolinário da Silva,Márcia Matiko Kondo
International Journal of Chemical Engineering , 2012, DOI: 10.1155/2012/915724
Abstract: The cultivation of strawberries generally requires substantial use of pesticides, and abamectin is the active principle of one of those most commonly employed. Conventional water treatment does not remove pesticides efficiently, so there is a need to investigate alternative procedures. The use of advanced oxidation processes (AOPs) can achieve good results in removal of toxic organic compounds present in aqueous solutions. The photo-Fenton process, one example of an AOP, was employed to study the degradation of abamectin. Results showed that when natural water samples contaminated with abamectin were treated using the photo-Fenton process, 70% of the initial amount of the compound was removed within 60 minutes of UV irradiation, and 60% mineralization was observed after 180 minutes of reaction. 1. Introduction Biocides are one of the most important classes of compounds introduced into surface waters by human activities [1]. They are widely used in agriculture and can contaminate rivers and other water bodies due to transport from cultivated areas [2–5]. Although the pesticide industry has developed new compounds that are more effective, even at lower concentrations, and that present lower environmental impacts [6], the misuse of such pesticides can pose considerable toxicity risks to operators, consumers, and the wider environment [7]. The cultivation of strawberries uses large amounts of pesticides. One of the most commonly employed is Vertimec 18 EC, which contains 1.8% (w/v) of abamectin, the active principle. Abamectin belongs to the avermectin group and has the molecular formula C48H72O14 (avermectin B1a) + C47H70O14 (avermectin B1b). It is used primarily as a biocide. Abamectin is a toxic chemical and can be fatal if inhaled, ingested, or absorbed by the skin. It causes skin and eye irritation, and at high doses can cause damage to the central nervous system (CAS no., 71751-41-2). The substance is also highly toxic to fish and aquatic invertebrates. The maximum acceptable daily intake (ADI) is 0.01?mg?kg?1 body weight, and the maximum residue limit is 0.02?mg?kg?1 of the commercial product [8]. Effluents containing biocides cannot usually be treated efficiently using biological techniques, since the effluents are toxic to the microorganisms involved so that the biodegradation efficiency is reduced [9]. An alternative treatment that has been investigated is based on the use of advanced oxidation processes (AOPs), which are very efficient for the removal of potentially toxic organic compounds from water systems. In AOPs, hydroxyl radicals are formed
An Efficient Objective Intelligibility Measure for Frequency Domain Scramblers
A. M. C. R. Borzino,J. A. Apolinário,D. G. da Silva
EURASIP Journal on Information Security , 2008, DOI: 10.1155/2007/32028
Abstract: An objective performance measure is proposed to evaluate the intelligibility of a speech signal having its frequency subbands permuted. The proposed tool can be used to generate efficient keys for frequency domain scramblers as well as to assess the results of cryptanalysis.
An Efficient Objective Intelligibility Measure for Frequency Domain Scramblers
Borzino AMCR,Apolinário JA,da Silva DG
EURASIP Journal on Information Security , 2007,
Abstract: An objective performance measure is proposed to evaluate the intelligibility of a speech signal having its frequency subbands permuted. The proposed tool can be used to generate efficient keys for frequency domain scramblers as well as to assess the results of cryptanalysis.
Periwinkle (Gastropoda: Littorinidae) habitat selection and its impact upon microalgal populations
APOLINáRIO, M.;COUTINHO, R.;BAETA-NEVES, M. H.;
Revista Brasileira de Biologia , 1999, DOI: 10.1590/S0034-71081999000200005
Abstract: the present study examines habitat selection and grazing pressure of the periwinkle nodilittorina lineolata (gmelin, 1791) on the rocky shore of arraial do cabo, rj, brazil (lat. 23°s, long. 43°w). transfer experiments suggest that periwinkles actively select the mid intertidal, where the cirripede chthamalus bisinuatus pilsbry is the dominant sessile invertebrate. we also conducted a caging experiment in the middle intertidal, manipulating grazers and light, to assess the impact of grazing upon microalgal density. grazing pressure significantly reduced microalgal abundance at the mid-intertidal level, suggesting that food availability plays an important role in the habitat selection of periwinkles on the studied shore.
Modelo de programa??o matemática para controle do crescimento da vegeta??o sob redes de distribui??o de energia elétrica
Apolinário, Liliani A. V.;Mantovani, José R. Sanches;
Sba: Controle & Automa??o Sociedade Brasileira de Automatica , 2011, DOI: 10.1590/S0103-17592011000300006
Abstract: in this paper the problem of scheduling execution of tree pruning under the distribution network is formulated as a binary programming model. this model seeks reducing the fault rates due to the vegetation and the optimized allocation of the annual financial and human resources available by the utilities to maintain the trees under the feeders without violating the financial resources constraints and the reliability index. the reliability index due to the vegetation causes are obtained by regression techniques of historical data from the faults occurred in each feeder. to solve the optimization model it is proposed a dedicated chu-beasley genetic algorithm. the proposed methodology is tested for an aerial distribution system of a medium size city.
Periwinkle (Gastropoda: Littorinidae) habitat selection and its impact upon microalgal populations
APOLINáRIO M.,COUTINHO R.,BAETA-NEVES M. H.
Revista Brasileira de Biologia , 1999,
Abstract: The present study examines habitat selection and grazing pressure of the periwinkle Nodilittorina lineolata (Gmelin, 1791) on the rocky shore of Arraial do Cabo, RJ, Brazil (lat. 23°S, long. 43°W). Transfer experiments suggest that periwinkles actively select the mid intertidal, where the cirripede Chthamalus bisinuatus Pilsbry is the dominant sessile invertebrate. We also conducted a caging experiment in the middle intertidal, manipulating grazers and light, to assess the impact of grazing upon microalgal density. Grazing pressure significantly reduced microalgal abundance at the mid-intertidal level, suggesting that food availability plays an important role in the habitat selection of periwinkles on the studied shore.
Set-Membership Proportionate Affine Projection Algorithms
Stefan Werner,José A. Apolinário,Paulo S. R. Diniz
EURASIP Journal on Audio, Speech, and Music Processing , 2007, DOI: 10.1155/2007/34242
Abstract: Proportionate adaptive filters can improve the convergence speed for the identification of sparse systems as compared to their conventional counterparts. In this paper, the idea of proportionate adaptation is combined with the framework of set-membership filtering (SMF) in an attempt to derive novel computationally efficient algorithms. The resulting algorithms attain an attractive faster converge for both situations of sparse and dispersive channels while decreasing the average computational complexity due to the data discerning feature of the SMF approach. In addition, we propose a rule that allows us to automatically adjust the number of past data pairs employed in the update. This leads to a set-membership proportionate affine projection algorithm (SM-PAPA) having a variable data-reuse factor allowing a significant reduction in the overall complexity when compared with a fixed data-reuse factor. Reduced-complexity implementations of the proposed algorithms are also considered that reduce the dimensions of the matrix inversions involved in the update. Simulations show good results in terms of reduced number of updates, speed of convergence, and final mean-squared error.
Fundamentos e aplica??es ambientais dos processos fenton e foto-fenton
Nogueira, Raquel F. Pupo;Trovó, Alam G.;Silva, Milady Renata A. da;Villa, Ricardo D.;Oliveira, Mirela C. de;
Química Nova , 2007, DOI: 10.1590/S0100-40422007000200030
Abstract: wastewater and soil treatment processes based on fenton's reagent have gained great attention in recent years due to its high oxidation power. this review describes the fundaments of the fenton and photo-fenton processes and discusses the main aspects related to the degradation of organic contaminants in water such as the complexation of iron, the use of solar light as the source of irradiation and the most important reactor types used. an overview of the main applications of the process to a variety of industrial wastewater and soil remediations is presented.
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