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Search Results: 1 - 10 of 156596 matches for " Ronaldo F. do; "
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Influência do material do destilador na composi??o química das aguardentes de cana: parte II
Cardoso, Daniel R.;Lima-Neto, Benedito S.;Franco, Douglas W.;Nascimento, Ronaldo F. do;
Química Nova , 2003, DOI: 10.1590/S0100-40422003000200004
Abstract: the quantitative chemical analysis of the brazilian sugar cane spirit distilled from glass column packaged with copper, stainless steel, aluminum sponge, or porcelain balls is described. the main chemical compounds determined by gas chromatography coupled with flame ionization (fid) and flame photometric (fpd) detectors and liquid chromatography coupled with diode array detector are aldehydes, ketones, carboxylic acids, alcohols, esters and dimethylsulfite (dms). the spirits produced either in columns filled with copper or aluminum pot still exhibits the lowest dms contents but the higher sulfate and methanol contents, whereas spirits produced in stainless steel or porcelain showed higher dms concentration and lower teors of sulfate ion and methanol. these observations are coherent with dms oxidation to sulfate, with methanol as by product, in the presence of either copper or aluminum.
Influência do material do destilador na composi o química das aguardentes de cana: parte II
Cardoso Daniel R.,Lima-Neto Benedito S.,Franco Douglas W.,Nascimento Ronaldo F. do
Química Nova , 2003,
Abstract: The quantitative chemical analysis of the Brazilian sugar cane spirit distilled from glass column packaged with copper, stainless steel, aluminum sponge, or porcelain balls is described. The main chemical compounds determined by gas chromatography coupled with flame ionization (FID) and flame photometric (FPD) detectors and liquid chromatography coupled with diode array detector are aldehydes, ketones, carboxylic acids, alcohols, esters and dimethylsulfite (DMS). The spirits produced either in columns filled with copper or aluminum pot still exhibits the lowest DMS contents but the higher sulfate and methanol contents, whereas spirits produced in stainless steel or porcelain showed higher DMS concentration and lower teors of sulfate ion and methanol. These observations are coherent with DMS oxidation to sulfate, with methanol as by product, in the presence of either copper or aluminum.
Análise dos fatores motivacionais e determinantes no processo de decis o de compra do consumidor turístico no entorno do Parque Nacional da Serra da Canastra na regi o de S o Roque de Minas (MG)
Ana Cristina Magalh?es Costa,Miguel Peres Jr,Michella C. do Prado,Ronaldo F. Silva
Revista Brasileira de Ecoturismo , 2010,
Abstract: O estudo do comportamento do consumidor tem se mostrado uma poderosa ferramenta na implementa o de a es mercadológicas eficazes. Na atividade turística – em particular no segmento ecoturístico – estes estudos s o ainda incipientes. Acredita-se que o conhecimento dos padr es comportamentais e dos processos que motivam e definem as escolhas dos turistas pode auxiliar sobremaneira na correta gest o das Unidades de Conserva o. A partir dessa premissa, desenvolveu-se este trabalho que investiga as características do consumidor turístico que visita o entorno do Parque Nacional da Serra da Canastra, na regi o de S o Roque de Minas, MG, procurando categorizá-los a partir dos fatores motivacionais e determinantes identificados. A metodologia adotada baseia-se na técnica de pesquisa survey sendo aplicados 182 questionários no período de junho a setembro de 2008. O presente artigo apresenta os principais resultados que mostraram que os fatores motivadores mais importantes para os turistas entrevistados est o relacionados ao contato com a natureza e à possibilidade de relaxamento e medita o em espa os naturais. Quanto aos fatores determinantes – aqueles que definem a escolha dos destinos – observou-se, na amostra pesquisada, que de modo geral, o pre o e a indica o de amigos e/ou parentes s o os mais importantes. Já para os fatores determinantes específicos – aqueles decisivos na escolha da regi o de S o Roque de Minas, MG – verificou-se que a distancia e o acesso s o os fatores mais impactantes. O trabalho traz ainda a proposta de segmenta o dos ecoturistas que visitam a regi o em dois grupos: os refratários, para quem o fator pre o é o mais importante e que n o s o influenciados, no processo de decis o de escolha do destino, por informa es vindas de agentes de turismo, amigos, parentes, ou pela divulga o na mídia; e os permeáveis, para quem estes mesmos fatores s o os mais importantes. Espera-se que, como decorrência dessa pesquisa, os agentes envolvidos na atividade turística no local, tanto públicos quanto privados, e, em especial os gestores do Parque Nacional da Serra da Canastra, possam aperfei oar seus esfor os de marketing, levando a regi o ao crescimento da atividade turística de forma sustentável.
Produ o de fitomassa em genótipos de citros submetidos a estresse hídrico na forma o do porta-enxerto Dry matter production of citrus genotypes under water stress during the rootstock formation
Janivan F. Suassuna,Pedro D. Fernandes,Ronaldo do Nascimento,Ana C. M. de Oliveira
Revista Brasileira de Engenharia Agrícola e Ambiental , 2012, DOI: 10.1590/s1415-43662012001200007
Abstract: Devido à importancia dos porta-enxertos no sucesso da citricultura e sua influência na tolerancia a fatores de estresse, desenvolveu-se este estudo com o objetivo de avaliar a tolerancia de porta-enxertos de citros ao estresse hídrico. Estudaram-se dois fatores: manejo hídrico ('sem estresse' e 'com estresse', neste último caso, com irriga o baseada em 50 e 25% da capacidade de campo) e porta-enxerto (10 genótipos de citros fornecidos pelo Programa de Melhoramento Genético de Citros da Embrapa Mandioca e Fruticultura Tropical). Adotou-se o delineamento em blocos casualizados com três repeti es e 15 plantas por parcela; avaliaram-se as fitomassas da parte aérea, das folhas, do caule, da raiz e total, além da rela o raiz/parte aérea, raz o de peso foliar e rendimento relativo. O déficit hídrico reduziu a fitomassa total e incrementou, em alguns porta-enxertos, a rela o raiz/parte aérea. A fitomassa foliar é a variável mais afetada, negativamente, nos porta-enxertos de citros sob deficiência hídrica. O genótipo 'TSKFL x CTTR-017' possui capacidade de adapta o ao déficit hídrico, com potencial promissor para uso em áreas sujeitas às condi es de seca. Knowing the importance of the rootstocks for the success of the citrus crop and its influence on tolerance to stress factors, this study was conducted in order to evaluate tolerance of citrus rootstocks to water stress studying two factors: water management ('without stress' and 'under stress' and in this latter case, the irrigation was based on 50 and 25% moisture of field capacity) and rootstocks factor (10 citrus genotypes provided by Citrus Breeding Program of Embrapa Cassava and Tropical Fruits). A randomized block design was adopted with three replications and 15 plants per plot. Shoot, leaves, stem, root and total dry mass, root/shoot ratio, leaf weight ratio and relative yield were evaluated. Water deficit reduced the total dry mass and increased the root/shoot ratio in some rootstocks. Leaf dry mass is the most sensible variable in citrus rootstocks under water deficit. 'TSKFL CTTR x-017' has a significant capacity of tolerance to drought, with promising potential for use in areas under drought conditions.
Avalia??o de cultivares de mandioca, para consumo in natura, quanto à resistência à mancha parda da folha
Santos, Ronaldo P.;Carmo, Margarida Goréte F. do;Parraga, Mário S.;Macagnan, Dirceu;Lopes, Clarindo Aldo;
Horticultura Brasileira , 2004, DOI: 10.1590/S0102-05362004000200014
Abstract: two field experiments were conducted to confirm the etiological agent of the cassava 'brown leaf spot', to study the progress of the disease and to evaluate resistance, agronomic and nutritional traits of different cassava cultivars. the experiments were performed in rio de janeiro state, brazil. in the first experiment, six cassava cultivars (amarelinha, marcos op, iac-264, baiana, mantiqueira and sonora), were evaluated from february/1997 to june/1998. in the second experiment, performed from january to august/1999, the same cultivars, plus 'saracura', and 'rosada de sc' were evaluated, in a randomized complete block design, with three replicates. the intensity of the disease, initiated from natural infection, was quantified at seven and 15 days, when the severity and the incidence of injured leaves were considered. at harvest, the severity and incidence of injured leaves, defoliation rates and number of injured leaves were estimated. disease progress curves were built for the incidence and for severity data; the area under the curves was used to calculate the disease severity and infected leaf severity. there were differences among the cultivars in relation to brown leaf spot resistance, caused by cercosporidium henningsii. cultivar 'amarelinha' was the most susceptible, and 'baiana' and 'sonora' the most resistant. there were no differences between the cultivars in yield and root characteristics, except 'amarelinha' with higher root weight. there was a negative and significant correlation between the severity of the disease (expressed by the values of the area under the disease progress curve) and the number and weight of roots.
Estudo das varia??es anat?micas do meato médio de doentes com queixas nasais através da nasofibroscopia flexível
Santos Junior, Ronaldo C.;Santos, Arlete C. G.;Jesus, Eduardo P. F. de;Abud, Lauro do N.;
Revista Brasileira de Otorrinolaringologia , 2003, DOI: 10.1590/S0034-72992003000200009
Abstract: the anatomical variations of the structure of the ostiomeatal complex as the agger nasi, the uncinate process, ethmoidal bulla and the middle turbinate can be properly evaluated by the standardization of the detailed endonasal flexible fiberoptic endoscopy. aim: the anatomical variations concerning sex, different groups of age, and the nasal cavity with variations were evaluated according to the development and pneumatization of the ethmoid bone. study design: clinical prospective. material and method: at the current thesis, 500 patients were studied with nasal complaints (1000 middle meatus). results and conclusions: extensive and bulbous-types conchas bullosas were the most frequent anatomical variation, followed by the overpneumatised agger nasi, paradoxical middle turbinate and medial angulation or medial prominence of the uncinate process. the agger nasi, extensive-type concha bullosa, paradoxical middle turbinate, medial angulation or medial prominence of the uncinate process and the overpneumatised ethmoid bulla tend to be bilateral, while the bulbous-type concha bullosa tend to be unilateral. a significant correlation between the prevalence of the overpneumatised agger nasi and the extensive and bulbous-types conchas bullosas in the same side, was observed. a significant correlation between the prevalence of extensive-type concha bullosa and bulbous-type concha bullosa in the contrary side, was observed. no significant correlation among the prevalence of the anatomical variations of the agger nasi, uncinate process, ethmoid bulla and middle turbinate was observed neither isolatedly nor associated, related to sex.
Estudo das varia es anat micas do meato médio de doentes com queixas nasais através da nasofibroscopia flexível
Santos Junior Ronaldo C.,Santos Arlete C. G.,Jesus Eduardo P. F. de,Abud Lauro do N.
Revista Brasileira de Otorrinolaringologia , 2003,
Abstract: Padronizando a nasofibroscopia flexível detalhada, podemos avaliar as varia es anat micas de estruturas do complexo ostiomeatal, tais como, agger nasi, processo uncinado, bula etmoidal e concha nasal média. OBJETIVO: Avaliar as varia es anat micas em rela o ao sexo, lado acometido e entre diferentes faixas etárias de acordo com o desenvolvimento e pneumatiza o do etmóide. FORMA DE ESTUDO: Clínico prospectivo. MATERIAL E MéTODO: No presente trabalho, foram estudados 500 doentes com queixas nasais (1000 meatos médios). RESULTADOS E CONCLUS ES: As conchas nasais médias globosas, extensiva e bulbosa, foram as varia es anat micas mais freqüentes, seguidas pelo agger nasi hipertrofiado, concha nasal média paradoxal e processo uncinado angulado ou projetado medialmente. O agger nasi, a concha média globosa extensiva, concha nasal média paradoxal, o processo uncinado angulado ou projetado medialmente e a bula etmoidal hipertrofiada tendem a ser bilaterais, enquanto a concha média globosa bulbosa tende a ser unilateral. Houve correla o significante entre a prevalência do agger nasi hipertrofiado e das conchas nasais médias globosas tipo extensiva e bulbosa ipsilateralmente. Houve correla o significante entre a prevalência da concha nasal média globosa tipo extensiva e da concha nasal média globosa tipo bulbosa contralateralmente. N o houve correla o significativa entre a prevalência das varia es anat micas do agger nasi, processo uncinado, bula etmoidal e concha nasal média isoladamente ou associadas, em rela o ao sexo.
Influência das fra??es granulométricas sobre a fixa??o de zinco pelo solo
Silveira, Ronaldo I.;Brasil Sobrinho, M.O.C. do;Mello, F.A.F. de;Arzolla, S.;Sarruge, J.R.;
Anais da Escola Superior de Agricultura Luiz de Queiroz , 1975, DOI: 10.1590/S0071-12761975000100021
Abstract: this paper was carried out in order to verify the effects of the clay, silt and sand soil fractions on zinc fixation by soils. ten grams each of 30 samples of different soils were placed in a 250 ml erlenmeyer flask and 4 ml of solution containing 100 mg of inert zn and 0.70 mc of radioactive 65zn were added. after 20 days of incubation, zn was extracted with 20 ml of 0.01 m edta solution made 1 m with respect to (nh4)2co3. an aliquot of 5 ml of the extract was transferred to a test-tube and radioactivity of 65zn in it was measured with a scintillation counter. quantity of fixed zn by the different soils was calculated from the data obtained and counting made on the standard solution. it was concluded that clay and silt took part of the zn fixation by the soil, but not the sand.
Influência do pH e dos teores de fosfato solúvel e matéria organica sobre a fixa??o de zinco pelo solo
Silveira, Ronaldo I.;Mello, F.A.F. de;Sobrinho, M.O.C. do Brasil;Arzolla, S.;Sarruge, J.R.;
Anais da Escola Superior de Agricultura Luiz de Queiroz , 1975, DOI: 10.1590/S0071-12761975000100022
Abstract: the purpose of this experiment was to verify the effects of some properties of the soil as ph, and the content of soluble phosphate and organic matter on the soil capacity to fix zinc. ten grams each of 30 samples of different soils were placed in a 250 ml erlenmeyer flask and 4 ml of solution containing 100 mg of inert zinc and 0.7 mcof radioactive 65zn were added. after 20 days of incubation, zn was extracted with 20 ml of 0.01 m edta solution made 1m respect to (nh4)2co3. an aliquot of 5 ml of the extract was transferred to a test tub and radioactivity of 65 zn in it was measured with a scintillation counter. quantity of zinc fixed by the different soils was calculated from the data obtained and county made on the standard solution. it was concluded that the amount of zinc fixed by the soil was positively correlated with ph, soluble phosphate and organic matter content of the soils.
Chemometric Characterization of Alembic and Industrial Sugar Cane Spirits from Cape Verde and Ceará, Brazil
Regina F. R. Pereira,Carla B. Vidal,Ari C. A. de Lima,Diego Q. Melo,Allan N. S. Dantas,Gisele S. Lopes,Ronaldo F. do Nascimento,Clerton L. Gomes,Maria Nataniela da Silva
International Journal of Analytical Chemistry , 2012, DOI: 10.1155/2012/840528
Abstract: Sugar cane spirits are some of the most popular alcoholic beverages consumed in Cape Verde. The sugar cane spirit industry in Cape Verde is based mainly on archaic practices that operate without supervision and without efficient control of the production process. The objective of this work was to evaluate samples of industrial and alembic sugar cane spirits from Cape Verde and Ceará, Brazil using principal component analysis. Thirty-two samples of spirits were analyzed, twenty from regions of the islands of Cape Verde and twelve from Ceará, Brazil. Of the samples obtained from Ceará, Brazil seven are alembic and five are industrial spirits. The components analyzed in these studies included the following: volatile organic compounds (n-propanol, isobutanol, isoamylic, higher alcohols, alcoholic grade, acetaldehyde, acetic acid, acetate); copper; and sulfates. 1. Introduction Sugar cane spirit, or cacha?a, is a typical Brazilian distilled beverage [1, 2]. This spirit is the second most consumed alcoholic beverage in the country and the third most consumed in the world. There are almost 30,000 cacha?a producers in Brazil and over 5,000 cacha?a brands available on the market [3]. In Cape Verde, the sugar cane spirit, grogue, is a drink produced mainly by archaic practices, without supervision and without efficient control of the production process. To ensure the quality of grogue, it is necessary to correct deviations over the course of the whole production process. For Cape Verde, because there is still no local legislation, the results are evaluated according to Brazilian legislation. Mathematical and statistical methods of analysis can be used for diverse scientific purposes, such as selecting the measurements and procedures best suited to chemical experiments or obtaining a more accurate analysis of the resulting information. According to the needs of any particular study, chemometrics can be used for analytical signal processing, experimental planning and optimization, pattern recognition, data classification, multivariate calibration, and/or monitoring and modeling of various processes, among other applications [4–7]. One of the first steps of chemometric analysis is to plot data in a multidimensional space, grouping the data with similar characteristics to demonstrate that there is some natural relationships between these data points. Thus, groups with distinct characteristics will be differentiated. Exploratory multivariate analysis is performed in a matrix, and the data are organized in a spreadsheet where “ ” samples with “ ” variables results in a
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