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Search Results: 1 - 10 of 780380 matches for " Delcy de A. Py Júnior "
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Release of Uranium by an Ore Treatment Unit at Caldas, MG, Brazil  [PDF]
Wagner de S. Pereira, Alphonse Kelecom, Juliana R. de S. Pereira, Delcy de A. Py Júnior
Journal of Environmental Protection (JEP) , 2013, DOI: 10.4236/jep.2013.46066
Abstract:

This study aims to assess the behavior of the release of Unat (i.e. uranium isotopes in natural relative abundance) from the release of water treated by the Ore Treatment Unit (UTM) in Caldas, state of Minas Gerais, Brazil, during the years 1999 to 2009. During this period, the unit showed no industrial activity, except between 2004 and 2005, when UTM operated 400 tons of monazite in a process to obtain rare earths. Unat was analyzed by spectrophotometry once per week in the effluent waters at sampling point 014. Two fractions were considered for analysis: the soluble one (that passes through a 0.45 μm filter) and the particulate one (retained on a 0.45 μm filter). Statistical analyses were performed: the “Z” test and Pearson’s r2 correlation index. The values for the soluble fraction were consistently lower than those of the particulate fraction and no statistically significant correlation was observed between the soluble and particulate fractions. However, the particulate and the total fractions (the sum of soluble and particulate) strongly correlated.

Activity of natural radionuclides and their contribution to the absorbed dose in the fish cubera snapper (lutjanus cyanopterus, cuvier, 1828) on the coast of Ceara, Brazil
Pereira, Wagner de S.;Kelecom, Alphonse;Py Júnior, Delcy de A.;
Brazilian Journal of Oceanography , 2010, DOI: 10.1590/S1679-87592010000800005
Abstract: a methodology was developed for converting the activity concentration of radionuclides (bq kg-1) into absorbed dose rate (gy y-1), aiming an approach to environmental radioprotection based on the concept of standard dose limit. the model considers only the internal absorbed dose rate. this methodology was applied to the cubera snapper fish (lutjanus cyanopterus, cuvier, 1828) caught off the coast of ceará. the natural radionuclides considered were uranium-238, radium-226, lead-210, thorium-232 and radium-228. the absorbed dose rates were calculated for individual radionuclides and the type of emitted radiation. the average dose rate due to these radionuclides was 5.36 μgy y-1, a value six orders of magnitude smaller than the threshold value of absorbed dose rate used in this study (3.65 103 mgy y-1), and similar to that found in the literature for benthic fish. ra-226 and u-238 contributed 67% and 22% of the absorbed dose rate, followed by th-232 with 10%. ra-228 and pb-210, in turn, accounted for less than 1% of the absorbed dose rate. this distribution is somewhat different from that reported in the literature, where the ra-226 accounts for 86% of the absorbed dose rate.
ETIOPATOGENIA DO C NCER BUCAL: FATORES DE RISCO E DE PROTE O
Saulo A. de Souza Júnior
SaBios : Revista de Saúde e Biologia , 2006,
Abstract: A brief revision of the epidemiological profile of oral cancer was carried out, as well as an analysis of pertinent literature of its risk and prevention factors. According to World Health Organization (WHO), oral cancer corresponds to, approximately, 6% of all the diagnosised cancers. In Brazil, according to INCA, in 2006, the incidence of oral cancer is esteem around 3% of the total of new cases of cancer, consisting in the seventh anatomical localization of neoplasms in men and the nineth in women. Approximately 3% to 5% of cancer cases, according to statistical data, will die soon after the diagnosis of the illness. Moreover, in approximately 30% of the cases, the survival tax does not exceed five years. The main risk factors in the development of neoplasms are the tobacco, the alcohol and the multiplicative effect observed in the association of both. Moreover, virus infections, nutritional deficiencies and the hereditary component of mutations in specific genes consist of relevant factors in the neoplastic transformations. On the other hand, elements found in the diet and healthful habits like adequate hygiene and alimentation, practice of physical exercises and secure sexual practices are considered factors of protection against oral cancer that, when associated to governmental actions as campaigns to reduce the tobaccoism and alcoholism, beyond the precocious detention and treatment of these injuries would make possible the reduction of the indices of death by neoplasms.
Parametros de dimensionamento para biodigestores batelada operados com dejetos de vacas leiteiras com e sem uso de inóculo
Xavier, Cristiane de A. N;Lucas Júnior, Jorge de;
Engenharia Agrícola , 2010, DOI: 10.1590/S0100-69162010000200003
Abstract: the aim of this work was to evaluate the inoculum addition on the anaerobic digestion of dairy cattle manure recycled in batch digesters by biogas yield, volatile solids reduction and biogas potential production to obtain design parameters. twelve field batch digesters (60 l each) filled with dairy catlle manure, water and four different inoculum additions (0, 20, 30 and 40%, v/v) were used. average times of hydraulic retention of 75 and 150 days were adopted for treatments with and without inoculum, respectively, during three periods of the year (intermediary, rainy and dry). the greatest daily biogas yields occurred in higher room temperatures (rainy period). higher biogas potential production was obtained by using 40% of inoculum, 0.07 m3 kg-1 manure, with rapid use of biogas from the four days. times of hydraulic retention of 45 days may be adopted, which reduces the volume of the digester and the implementation costs.
Altera??es físicas e microbiológicas durante a compostagem dos dejetos de cabras
Orrico, Ana C. A.;Lucas Júnior, Jorge de;Orrico Júnior, Marco A. P.;
Engenharia Agrícola , 2007, DOI: 10.1590/S0100-69162007000400020
Abstract: this work aimed at to evaluate the dry mass, volume and coliforms reductions during the composting of the manure generated by saanen and f1 (saanen boer x) goats, fed with three diets (diet 1 = 80% forage (f) and 20% concentrated (c); diet 2 = 60% f and 40% c, and diet 3 = 40% f and 60% c). the largest reductions (p <0.05) of the amounts of dry mass occurred in piles formed with the manure generated by goats fed with diet 3 (56.2%), in relation to the manure produced when the animals consumed the diets 2 (44.5%) and 1 (40.6%). the largest average of the weekly temperature occurred in the first week in piles formed with goat manure that consumed diet 3. the originated piles of goat manure feed with diet 1 maintained the superior temperature for longer time (50.75 oc, in the third week), in relation to those originated from goats fed by diets 2 and 3 (45.90 and 42.00 oc, respectively, in the same period). the reductions of total and fecal coliforms were of 99.99% minimum. the volume reductions, in time function, generated quadratic equations in all the conditions.
Biodigest?o anaeróbia de dejetos de suínos com e sem separa??o da fra??o sólida em diferentes tempos de reten??o hidráulica
Orrico Júnior, Marco A. P.;Orrico, Ana C. A.;Lucas Júnior, Jorge de;
Engenharia Agrícola , 2009, DOI: 10.1590/S0100-69162009000300014
Abstract: this work aimed to evaluate the anaerobic biodigestion process by using swine manure with and without separation of the solid fraction and considering different hydraulic retention times. for such purpose semi continual plug flow biodigestors were used, with residual water from a pig farm with and without separation of the solid fraction, managed with 36; 29; 22 e 15 days of hydraulic retention. efficiency of the treatments was evaluated by the reduction of the most probable number of total and fecal coliforms, fiber content, chemical and biochemical oxygen demands, besides the biogas and methane production potential and biofertilizer quality. the separation of the solid fraction decreased in fiber content from effluents, what contributed to an increase in the efficiency in the methane production. the observed values were: 0.47 and 0.75 m3 ch4 kg-1 vs added to the effluent with and without separation of the solid fraction respectively, in the hrt of 15 days. with the increase of hrt there was a medium increase of 50% in the production of potential of methane kg-1 vs added. it was not observed significant differences in reduction of fecal and total coliforms. the largest reduction was 3.6 109 to 3.6 102 nmp 100 ml-1 for the 36 days hrt.
Compostagem da fra??o sólida da água residuária de suinocultura
Orrico Júnior, Marco A. P.;Orrico, Ana C. A.;Lucas Júnior, Jorge de;
Engenharia Agrícola , 2009, DOI: 10.1590/S0100-69162009000300015
Abstract: this work aimed to evaluate the development of the composting process by using the solid fraction of residual water from a pig farm. to obtain the solid fraction, the residual water was sewed in a 1mm screen sew. after separation, the solid fraction was used to form three composting piles, on a patio with concrete floor and plastic cover. during composting the solid fraction of residual water from pig farms was monitored: temperature, total solids reduction (ts), volatile solids (vs) chemical demand for oxygen (cdo), organic carbon, compostable organic matter (com), organic matter resistant to composting (omrc), most probable numbers (mpn) of total coliforms and fecal coliforms, as well as volume and quality of the compost. the composting showed to be efficient for treatment of the solid fraction of residual water from pig farms because of the high reduction of manure polluting potential, which reduction of 71.24% of ts contents, 64.55% of volume, 56.89% of cdo and 56.89% com. reductions of 100% in mpn total coliforms and fecal coliforms were observed, what allows its use as organic fertilizer.
Influência da rela??o volumoso: concentrado e do tempo de reten??o hidráulica sob a biodigest?o anaeróbia de dejetos de bovinos
Orrico Júnior, Marco A. P.;Orrico, Ana C. A.;Lucas Júnior, Jorge de;
Engenharia Agrícola , 2010, DOI: 10.1590/S0100-69162010000300003
Abstract: the aim of this survey was to evaluate the possible alterations that exist in composition and in anaerobic biodigestion process of cattle manure in phase of slaughter and fed with different proportions of roughage: concentrate and with different times of hydraulic retention (thr). 24 batch digesters of bench with capacity of 12 liters, from which 12 were provided with cattle manure that were fed with diet 1 (60% roughage: 40% concentrate) and diet 2 (40% roughage:60% concentrate) and submitted to 30; 60; 90 and 120 days of trh were used. the efficiency of anaerobic biodigestion process was evaluated by reductions of total solids, volatile solids; neutral detergent fiber, acid detergent fiber, cellulose and the most probable number (mpn) of total and thermo tolerant coliforms, and production potential of biogas and methane were evaluated. results showed that the increase of roughage proportion in diet conduced the smallest efficiency in the process, mainly in the production potential of biogas and methane, which were, in average, 13% smaller. regarding to mpn of total and thermo tolerant coliforms, significative reductions as increased thr were observed.
Biodigest?o anaeróbia dos resíduos da produ??o avícola: cama de frangos e carca?as
Orrico Júnior, Marco A. P.;Orrico, Ana C. A.;Lucas Júnior, Jorge de;
Engenharia Agrícola , 2010, DOI: 10.1590/S0100-69162010000300018
Abstract: the purpose of this study was to evaluate the production of biogas, and the production potential, and quality of biofertilizer obtained from the anaerobic digestion of waste poultry litter and poultry carcasses pre composted. for this were pre composted poultry litter and carcasses of dead birds in a composter for a period of 60 days, time needed to occur prior decomposition of the carcasses and so it can manipulate the material to supply the biodigestor. after this period the material was used to supply the batch field biodigestor with a capacity of 60 liters of material in fermentation. for the process of anaerobic digestion tests were performed in the levels of total solids (ts), volatile solids (vs), chemical composition of effluent, and the most probable number (mpn) of total and thermotolerant coliforms in the influent and effluent. the potential average productions of biogas are: 0073, 0152, 0141m 3.kg-1 of material, vs and ts added, respectively. there were reductions of over 99% in nmp of total and thermotolerant coliforms, and observed mpn of 3.7 x 105.g-1 at the beginning and 7.45 x 102 g-1 at the end.
Avalia??o de parametros da biodigest?o anaeróbia de dejetos de suínos alimentados com dietas à base de milho e sorgo
Orrico Júnior, Marco A. P.;Orrico, Ana C. A.;Lucas Júnior, Jorge De;
Engenharia Agrícola , 2010, DOI: 10.1590/S0100-69162010000400004
Abstract: the aim of this work was to evaluate the interference of a diet based on sorghum in substitution of corn in the compound and treatment of waste. twenty four batch digesters of bench with capacity of 12 liters, from which 12 were provided with swine waste that were fed with a diet base on corn and the others with a diet based on sorghum. at every 30 days, 3 digesters of each diet were emptied, in a total of 4 hydraulic retention times (hrt): 30; 60; 90 and 120 days. for evaluating the efficiency of anaerobic biodigestion process, reduction of total solids, total volatile solids, chemical demand of oxygen, biochemical demand of oxygen, the most probably number (nmp) of total and thermo tolerant coliforms, besides potentials of biogas and methane production were evaluated. results showed that swine waste that were fed with diets based on sorghum, presented a smaller efficiency of the process, mainly for potentials of biogas and methane production. in average, potentials were 8.6% smaller (p<0.01) than potentials that were obtained from biodigestors provided with swine waste that were fed with diet based on corn. regarding to nmp of total and thermo tolerant coliforms, only significative reductions were observed as increase hrt.
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