90 research outputs found

    Air quality photochemical study over Amazonia Area, Brazil

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    This work presents the results of a photochemical modelling system composed of MM5-SMOKE-CMAQ on Brazilian Amazonia area, been a pioneered implementation task. These results focus on the biogenic and biomass burning emissions and the impact of these emissions on regional air quality. Global and local anthropogenic emissions data, satellite-derived biomass burning inventories, and biogenic emissions calculated with MEGAN model were used to estimate emissions over the domain. The goal is the development of air quality model input data for CMAQ. Results are consistent with O3 formation theory and CO hotspot concentration matches with the geographic area of biomass burning.Indisponível

    Survival of Fusarium oxysporum f. sp. lycopersici Race 2 subjected to the solarization technique associated with cassava leaves amendment

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    A solariza√ß√£o combinada com a pr√©via adi√ß√£o de material org√Ęnico propicia controle efetivo de diversos fungos de solo que de outra forma s√£o de dif√≠cil erradica√ß√£o, permitindo, tamb√©m, redu√ß√£o do tempo de tratamento. O objetivo do trabalho foi avaliar o controle do fungo Fusarium oxysporum f. sp. lycopersici Ra√ßa 2, por meio da incorpora√ß√£o da parte a√©rea de mandioca brava (Manihot utilisima) e mandioca mansa (Manihot dulcis) seguido de solariza√ß√£o do solo. Foi realizado experimento de campo, onde incorporou-se 3 Kg/m¬≤ da parte a√©rea de mandioca brava e mandioca mansa, separadamente. O experimento constou de seis tratamentos (solariza√ß√£o + mandioca brava; solariza√ß√£o + mandioca mansa; solo solarizado; solo; mandioca brava e mandioca mansa). A sobreviv√™ncia do fungo foi avaliado por meio das estruturas de resist√™ncia em meio semi-seletivo de Komada, aos 7, 14, 21 e 28 dias do in√≠cio do experimento. As temperaturas do solo foram monitoradas atrav√©s de um coletor de dados Tipo CR23X (Campbell Scientific) e a quantifica√ß√£o dos gases (CO2 e O2) foi feita pelo equipamento analisador de gases (Testo 325-1). Nos tratamentos solarizados, a temperatura do solo e aprisionamento de CO2 foram maiores em rela√ß√£o √† testemunha (solo) e aos tratamentos apenas com a incorpora√ß√£o de material vegetal. A associa√ß√£o da incorpora√ß√£o de mandioca, tanto a "brava" quanto a "mansa", com a solariza√ß√£o, proporcionou a inativa√ß√£o de F. oxysporum f.sp. lycopersici Ra√ßa 2, podendo atuar no controle da doen√ßa murcha de fusarium causada por este pat√≥geno. Os demais tratamentos foram in√≥cuos, permitindo a sobreviv√™ncia do fungo.Soil solarization associated with organic matters provides an effective control of several soil-borne fungi, which are difficult to eliminate using other methods; in addition, this association shortens the treatment time. The aim of this study was to assess the control of Fusarium oxysporum f. sp. lycopersici Race 2 by combining the amendment of "bitter" cassava (Manihot utilisima) and "sweet" cassava (Manihot dulcis) leaves with soil solarization. A field experimental was carried out, 3Kg/m¬≤ of the two types of cassava leaves were separately amended. Six treatments were tested, (solarizated+ "bitter" cassava, solarizated+"sweet" cassava, soil solarizated, soil, "bitter"cassava and "sweet"cassava). Fungus control was assessed based on the survival resistance structures on semi-seletive Komada medium at 7, 14, 21 and 28 days after the beginning of the experiment. Soil temperature values were monitored by a DataLogger Type CR23X (Campbell Scientific), and quantity of CO2 and O2 was monitored by a gas analyzer equipment (Testo 325-1). In solarizated treatments, soil temperature and trapping of CO2 were higher than the control (soil) and treatments with organic material incorporated without solarization. The association of both "bitter" and "sweet" cassava amendment with soil solarization inatived the pathogen whereas the other treatments had no effect, allowing the survival of the fungus.Funda√ß√£o de Amparo √† Pesquisa do Estado de S√£o Paulo (FAPESP

    Efeitos de materiais org√Ęnicos e da umidade do solo na patogenicidade de Rhizoctonia solani K√ľhn GA-4 HGI ao feijoeiro

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    The pathogenicity of Rhizoctonia solani AG-4 HGI on bean (Phaseolus vulgaris L.) plants was evaluated, in artificially infested soil under greenhouse conditions, when submitted to the following treatments: amendments with different C:N ratios (castor-oil cake and sugar-cane bagasse); different organic matter decomposition levels; different moisture contents of the amended soil. Until the moment of sowing the soil moisture was maintained at 20% of the moisture-holding capacity or above 80%. The sowings were made at 0, 7, 14, 21, 28 and 35 days after the inoculation and amendments incorporation. Evaluations were carried out 14 days after each sowing date. The amendment with low C:N ratio increased the incidence of R. solani on bean plants, in any decomposition level, whereas the amendment with high C:N ratio did not interfere on the incidence of the pathogen. The incidence of R. solani on bean plants, in a soil amended with both castor-oil cake or sugar-cane bagasse, was independent of the soil moisture condition.Foram avaliados, em casa de vegeta√ß√£o, os efeitos das seguintes vari√°veis sobre a patogenicidade de Rhizoctonia solani GA-4 HGI a plantas de feij√£o (Phaseolus vulgaris L.), em solo artificialmente infestado: presen√ßa de materiais org√Ęnicos com diferentes rela√ß√Ķes C:N (torta de mamona e baga√ßo de cana); n√≠veis de decomposi√ß√£o da mat√©ria org√Ęnica, e condi√ß√Ķes de umidade do solo incorporado. A umidade do solo at√© o momento da semeadura foi mantida sob duas condi√ß√Ķes: 20% ou acima de 80% da capacidade de campo. Foram realizadas semeaduras aos 0, 7, 14, 21, 28 e 35 dias ap√≥s inocula√ß√£o e incorpora√ß√£o. As avalia√ß√Ķes foram realizadas 14 dias ap√≥s cada semeadura. O material com baixa rela√ß√£o C:N propiciou o aumento da incid√™ncia de R. solani no feijoeiro, enquanto o material com alta rela√ß√£o C:N n√£o interferiu na incid√™ncia do pat√≥geno. A incid√™ncia de R. solani no feijoeiro, em solo incorporado, foi independente da condi√ß√£o de umidade

    Efeitos de materiais org√Ęnicos e da umidade do solo na patogenicidade de Rhizoctonia solani K√ľhn GA-4 HGI ao feijoeiro

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    The pathogenicity of Rhizoctonia solani AG-4 HGI on bean (Phaseolus vulgaris L.) plants was evaluated, in artificially infested soil under greenhouse conditions, when submitted to the following treatments: amendments with different C:N ratios (castor-oil cake and sugar-cane bagasse); different organic matter decomposition levels; different moisture contents of the amended soil. Until the moment of sowing the soil moisture was maintained at 20% of the moisture-holding capacity or above 80%. The sowings were made at 0, 7, 14, 21, 28 and 35 days after the inoculation and amendments incorporation. Evaluations were carried out 14 days after each sowing date. The amendment with low C:N ratio increased the incidence of R. solani on bean plants, in any decomposition level, whereas the amendment with high C:N ratio did not interfere on the incidence of the pathogen. The incidence of R. solani on bean plants, in a soil amended with both castor-oil cake or sugar-cane bagasse, was independent of the soil moisture condition.Foram avaliados, em casa de vegeta√ß√£o, os efeitos das seguintes vari√°veis sobre a patogenicidade de Rhizoctonia solani GA-4 HGI a plantas de feij√£o (Phaseolus vulgaris L.), em solo artificialmente infestado: presen√ßa de materiais org√Ęnicos com diferentes rela√ß√Ķes C:N (torta de mamona e baga√ßo de cana); n√≠veis de decomposi√ß√£o da mat√©ria org√Ęnica, e condi√ß√Ķes de umidade do solo incorporado. A umidade do solo at√© o momento da semeadura foi mantida sob duas condi√ß√Ķes: 20% ou acima de 80% da capacidade de campo. Foram realizadas semeaduras aos 0, 7, 14, 21, 28 e 35 dias ap√≥s inocula√ß√£o e incorpora√ß√£o. As avalia√ß√Ķes foram realizadas 14 dias ap√≥s cada semeadura. O material com baixa rela√ß√£o C:N propiciou o aumento da incid√™ncia de R. solani no feijoeiro, enquanto o material com alta rela√ß√£o C:N n√£o interferiu na incid√™ncia do pat√≥geno. A incid√™ncia de R. solani no feijoeiro, em solo incorporado, foi independente da condi√ß√£o de umidade

    Perceptions in the use of technology for payments: a study of customer behavior in food and beverage sector

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    Surveys indicates that companies in the food and beverage sector in Brazil, are cautious in the adoption of payment technology with the use of mobile devices. Aiming to investigate the relationship between consumer behaviour on new techonology’s use and adoption in this sector, this paper explore the costumers expectations and perceptions on the mobile payment technology applied on the food and beverage industry. The method involved as inquiry with 80 interviewees, that suggested changes and quick addoptance among comercial establishments on new techonology devices/resources. All interviewees were aware of costumer driven payment Technologies such as mobile apps, tablets, remote cashiers and payments devices and the totality expect to install and use those technology devices on their restaurants in the next couple years. Potencial benefits of eletronic self payment for clientes includes, a faster process, less team waiting time (maitre, waiter or cashier), higher safety and costumer satisfaction, reduction on labor costs, higher incomen due to higher table rotation e access to better costumer data. Ironically, safety is considered a potential barrier. Other barriers include infra-estructure issues, devices costs, POS and devices payments intregration costs, the impact of lower costumer/team contact and the fact that the the technology already availble in the industry is fragmented and in embrionary phase

    Advances of orbital gas tungsten arc welding for Brazilian space applications ‚Äď experimental setup

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    The present work describes details of the several steps of the technology involved for the orbital Gas Tungsten Arc Welding (GTAW) process of pure commercially titanium tubes. These pieces will be used to connect the several components of the propulsion system of the China-Brazilian Satellite CBERS, and is part of the Brazilian aerospace industry development. The implantation involved the steps of environment control; cut and facing of the base metal; cleaning procedures; piece alignment; choice of the type, geometry and installation of the tungsten electrode; system for the pressure of the purge gas; manual tack welding; choice of the welding parameters; and, finally, the qualification of welding procedures. Three distinct welding programs were studied, using pulsed current with increasing speed, continuous current and pulsed current with decreasing amperage levels. The results showed that the high quality criteria required to the aerospace segment is such that usual welding operations must be carefully designed and executed. The three welding developed programs generated welds free of defects and with adequate morphology, allowing to select the condition that better fits the Brazilian aerospace segment, and to be implanted in the welding of the CBERS Satellite Propulsion System

    Implementation of a filter for active noise cancellation in earmuffs for agricultural tractor operations

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    The implementation of agricultural mechanization is of paramount importance in modern agriculture, providing the replacement of manual and animal work with the aid of modern machines, contributing to an increase in productivity in crops of increasingly larger areas. However, the use of these technologies can bring some inconvenient factors from an ergonomic point of view. Machine operators, for example, are exposed to high noise levels from tractors. Its harmful effects on health are not limited to hearing alone, but can also cause emotional, cardiovascular and fatigue disorders. There are two methods for noise attenuation: The passive method, which consists only of a physical barrier between the listener\u27s ear canal and the external environment, and the active method, which is based on electronic equipment capable of generating a signal that the phenomenon of destructive wave interference. Agricultural operators often use passive noise mufflers which have the disadvantage of attenuating all sounds indiscriminately, thus limiting the operator\u27s auditory perception. In this context, this work proposes an implementation of active noise cancellation that cancels only noise, allowing other ambient sounds to be heard normally. The work developed is of an experimental nature, where a noise source in an agricultural operation was analyzed, which was used as an input signal for the construction of the filter and simulation. The filter was able to perform active noise cancellation using the LMS and NLMS algorithms, but the NLMS presented better results

    INVESTIGANDO O CONHECIMENTO ETNOHERPETOL√ďGICO DOS CAFEICULTORES SOBRE AS SERPENTES DO MUNIC√ćPIO DE INCONFIDENTES, MINAS GERAIS

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    A rela√ß√£o entre homens e serpentes se demonstra estreita desde os tempos mais antigos, e devido √†s cren√ßas atribu√≠das a esse grupo ela se tornou conflituosa e, na maioria das vezes, resulta na supress√£o desses animais na natureza. Sabendo que a humanidade busca identificar e categorizar os diversos grupos biol√≥gicos do planeta, a etnoherpetologia traz um estudo mais espec√≠fico e delimita seu enfoque ao conhecimento, utiliza√ß√£o, classifica√ß√£o e conviv√™ncia com os r√©pteis. Por isso, o presente estudo investiga o conhecimento sobre as serpentes por parte dos produtores rurais do munic√≠pio de Inconfidentes, localizado no sul do Estado de Minas Gerais. Os dados foram obtidos por meio de question√°rios estruturados nos meses de agosto de 2016 a agosto de 2017, aplicados em bairros de zona rural do munic√≠pio, totalizando 38 cafeicultores. Foram relatadas cren√ßas e percep√ß√Ķes atribu√≠das √†s serpentes, bem como de algumas etnoesp√©cies foram registrados ¬†dados ecol√≥gicos e comportamentais. Percebeu-se uma estreita rela√ß√£o da comunidade com as serpentes, entretanto, como pressuposto, a rela√ß√£o se mostra conflituosa, fazendo-se necess√°rias a√ß√Ķes que busquem reverter essa situa√ß√£o. Sabe-se que as serpentes desempenham um efetivo papel ecol√≥gico nos ecossistemas em que est√£o inseridas, portanto, o presente estudo contribui para conscientiza√ß√£o e preserva√ß√£o das serpentes, podendo ainda reduzir a subtra√ß√£o desses animais no ambiente natural

    Cost management: bibliometrics in the annals of the national production engineering meeting

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    The National Meeting of Production Engineering (ENEGEP) is an event organized by the Brazilian Association of Production Engineering (ABEPRO) in which brings together the academic community of researchers working in the sector of Production Engineering and constitutes one of the leading promoters of technical and scientific production in the area. Among the various topics transiting the meeting, cost management is one of those who has relevant interaction. This article aims to analyze the academic contributions published in the Annals ENEGEP from 2008 to 2018 and trends in the area of ‚Äč‚ÄčEconomic Management, Cost Management subarea. Methodologically it made the use of bibliometric analysis techniques, analyzing, quantitatively and qualitatively, 219 articles, considering the following variables: quantitative evolution of publications; authoring features per article; authors; educational institutions; keywords; and themes. The main results identified an average of twenty papers per year with the cost management issue, the vast majority of publications were carried out with two or more authors, in relation to the authorship, 71% of authors had only one article, the southern region is the one most representative authors of publications, and as to the keywords which is evident most frequently are "Cost Management" and "costs"

    Estimativa da produção comercial da manjuba, Anchoviella lepidentostole (Fowler, 1911) (Osteichthyes, Engraulidae), no Rio Ribeira de Iguape, em Registro (SP)

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    This work, carried out in Registro, S√£o Paulo State, Brazil, relates fishery effort (number of fishermen) with the capture (Kg) of ‚Äúmanjuba" Anchoviella lepidentostole (Fowler,1911), from 1978 to 1982, through a liner regression (correlation coefficient - 0,97) and, with their respective maintainable production, through a linear regression (correlation coefficient - 0,88), revealing a noticeable descent in production.Trabalho realizado em Registro (SP), no per√≠odo de 1978 a 1982, correlacionando o esfor√ßo (n√ļmero de pescadores) com a captura (Kg) de manjuba Anchoviella lepidentostole (Fowler, 1911), ¬†atrav√©s de regress√£o linear (coeficiente de correla√ß√£o 0,97) e, tamb√©m, as produ√ß√Ķes sustent√°veis com os respectivos anos (coeficiente de correla√ß√£o - 0,88), mostrando ter ocorrido queda na produ√ß√£o
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