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Search Results: 1 - 10 of 40229 matches for " Daniel Mariano Leite "
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Deslizamento de rodados de tratores de pneus em diferentes opera??es agrícolas
Coelho, Hêner;Fernandes, Haroldo Carlos;Campos, Diogo Santos;Teixeira, Mauri Martins;Leite, Daniel Mariano;
Revista Ceres , 2012, DOI: 10.1590/S0034-737X2012000300006
Abstract: in tractors, the wheel sliding is caused by several factors, including the tractive effort required to move a certain implement and type of surface that is in contact with the tire treads. this study aimed at evaluating the wheel sliding of a tractor in different corn tillage systems in bambuí, mg, brazil. the experiment was conducted in the field in the second crop of autumn 2011 at the minas gerais federal institute - campus bambuí (experimental station) in an oxisol ustox. the experiment was arranged in split-plots, with the operations in the plots, the gears in the splitplots and rotations in the split-splitplots, in a randomized block design with three replications, totaling eighty-one experimental units. the factors and levels studied were: (ct) conventional tillage (mt), minimum tillage (nt) and no tillage. each treatment used three run speeds (a2, a3 and b1) in three motor rotations (1600, 1900 and 2200 rpm). the results showed that in the conventional tillage, the highest wheel sliding occurs in the sowing operation; in the minimum tillage, the highest wheel sliding occurs in the operation of scarification; and in no tillage system in the sowing operation.
Quantitative losses in mechanized harvesting corn crop in small footprint and conventional Perdas quantitativas na colheita mecanizada do milho cultivado em espa amentos reduzido e convencional
Danilo Roberto Loureiro,Haroldo Carlos Fernandes,Mauri Martins Teixeira,Daniel Mariano Leite
Semina : Ciências Agrárias , 2012,
Abstract: The objective of this study was to evaluate the quantitative losses occurred in the mechanical harvesting of the corn grown in conventional and reduced gaps. The experimental design was randomized blocks with three replications and treatments distributed in a factorial (2 x 3 x 3), and two spacings (0.45 m and 0.90 m), three speeds of the combine (1.8 km.h-1 3.5 km.h-1 and 4.1 km.h-1) and three openings of the concave (25 mm, 30 mm and 35 mm). For treatments where the spacing was 0.45 m, the harvester worked with a power of two lines dividing line between the platform crop while in treatments where the spacing was 0.90 m, the harvester worked with a power dividing line between a line of platform. The plant population was the same for the two spacings used in the experiment. The natural losses were higher in the conventional spacing, but the header losses of harvest had the lowest use this space at a speed of 3.5 km.h-1. As maiores perdas ocorreram nos mecanismos internos da colhedora ocorreu quando se utiliza a abertura c ncava de 30 mm a uma velocidade de 3,5 km.h-1. Total losses accounted for 8.2% and 7.3% of the average productivity in the gaps of 0.45 m 0.9 m respectively Objetivou-se com este trabalho, avaliar as perdas quantitativas ocorridas na colheita mecanizada do milho cultivado em espa amentos reduzido e convencional. O delineamento experimental foi o de blocos casualizados com três repeti es em esquema fatorial (2 x 3 x 3), sendo dois espa amentos ( 0,45m e 0,90m): três velocidades da colhedora (1,8 km.h-1 3,5 km.h-1 e 4,1 km.h-1) e três aberturas do c ncavo (25 mm, 30 mm e 35 mm). Para os tratamentos onde o espa amento entre linhas foi de 0,45 m, a colhedora trabalhou com uma alimenta o de duas linhas entre os divisores de linha da plataforma de colheita enquanto nos tratamentos onde o espa amento foi de 0,90 m, a colhedora trabalhou com uma alimenta o de uma linha entre os divisores de linha da plataforma. A popula o de plantas foi a mesma para os dois espa amentos utilizados no experimento. As perdas naturais foram maiores nos tratamentos com espa amento convencional, porém as perdas na plataforma de colheita apresentaram os menores valores utilizando esse espa amento na velocidade de 3,5 km.h-1. As maiores perdas ocorridas nos mecanismos internos da colhedora ocorreram quando se utilizou abertura do c ncavo de 30 mm a uma velocidade de 3,5 km.h-1. As perdas totais representaram 8,2% e 7,3% da produtividade media nos espa amentos de 0,45 m e 0,9 m respectivamente
Assessment of implementation of quality management system in laboratory research and food analysis
Daniel Mariano Leite,Arlene Gaspar,Vanessa Regina Silva Chagas,Stella Regina Reis da Costa
Sistemas & Gest?o , 2009,
Abstract: The reliability of the results generated in analytical laboratory either for the development of new methods or for the appropriate use of methodologies already regulated, is essential to ensure that consumers are receiving a nutritionally adequate and safe food. In this context, traceability has been one of the main requirements required in the analysis, once this allows comparability between results of measurements carried out in different situations, usingvalues of metrological references, clearly defined, within internationally accepted criteria. The objective of this research was to assess the activities developed in a laboratory for research and analysis of food, about the accordance of item 4, which is established requirements of Direction, and the item 5, technical requirements of ISO/IEC 17025:2005, to guide correction of non conformities and internal organization. Initially there was a check list for verification of compliance for the activities developed in the laboratory. When the non-conformities were found, the staff was trained and was applied the 5S System. In applying the first check list in accordance with the item 4, the laboratory was classified in Group 3 of the Standard, with 57.14% of non-conformities, after training and implementation of corrective measures. In a new application of check list, the laboratory was classified in Group 2, and was occurred reduction of 37.5% of non-conformities. As to item 5, the laboratory was classified in Group 2, with 44.44% of non-conformities. After the training and corrective measures, there was reduction of 54% of non-conformities. It can be concluded that for elimination of nonconformance is required to train staff and implement tools such as 5S System and especially encourage the involvement of employees
Avalia o da aplica o de sistema de gest o da qualidade em laboratório de pesquisa e análise de alimentos
Daniel Mariano Leite,Arlene Gaspar,Vanessa Regina Silva Chagas,Stella Regina Reis Da Costa
Sistemas & Gest?o , 2010,
Abstract: A confiabilidade dos resultado
Use of digital images for evaluating soil compaction in the culture of beans
Leite, Daniel Mariano;Vieira, Luciano Bai?o;Fernandes, Haroldo Carlos;Carneiro, José Eustáquio Souza;Fernandes Filho, Elpídio Inácio;Santos, Nerilson Terra;
Ciência e Agrotecnologia , 2012, DOI: 10.1590/S1413-70542012000200011
Abstract: bean yield in brazil is considered low, around 820 kg ha-1, reaching values above 3000 kg ha-1, there are several environmental factors which may limit the performance of this culture, especially those related to the soil. the present work aimed to evaluate soil compactions in bean culture of different soil management systems, by means of digital images. this study took place at the federal university of vi?osa, randomized block design with six replications was used and four treatments, (direct planting, conventional preparation, minimum plantation using grade crusher-leveler and minimum plantation using scarificator), were evaluated. the spectral responses using the vegetation indexes (ndvi, rs, gndvi, vari, wdrvi and savi) were evaluated, calculated from digital numbers of the images and the values were estimated from the reflectance. for obtainning the images, a platform containing two digital cameras, one sensitive in the region of visible (rgb) and another sensitive to the region of proximal infrared were used, this platform was attached to a helium-inflatable balloon. the vegetation indexes obtained from the values of digital numbers of images were only able to defer treatments 70 days after plantation. however, indexes obtained from the reflectance, deferred treatments at 34 and 70 days after planting.
La construcción de la idea de trabajo digno en los cirujas de la ciudad de Buenos Aires
Perelman,Mariano Daniel;
Intersecciones en antropolog?-a , 2011,
Abstract: the aim of this article is to analyze how a group of people that began to cirujear in the mid-1990s in the city of buenos aires constructed the activity as a legitimate way of living. the focus of the article is put on the understanding of how some garbage scavengers constructed themselves as subjects that perform a worthy activity, on the meanings that the activity has acquired and on the practices and discourses that allowed this construction to happen. the article not only focuses on the area of need (earning the living), but at the same time, is put on the construction of legitimate and reasonable ways to do it from two different analytical levels. on the one hand a level regarding the construction of ideals (hegemonic) to be a worker. on the other hand, the ways in which subjects (re) construct their experiences, build relationships, and generate social imaginaries, explanations, justifications about their occupation and the ways they are changing.
Memórias de la quema: O cirujeo em Buenos Aires trinta anos depois
Perelman, Mariano Daniel;
Mana , 2010, DOI: 10.1590/S0104-93132010000200006
Abstract: exploring the testimonies and memories of cirujas (waste pickers) who lived and worked at la quema, a dump in buenos aires, this article reconstructs the meanings acquired by this activity over time. analyzing these accounts produced some thirty years after the closure of la quema and in a new social context where the activity has become more commonplace, the text argues that the 'historical' cirujas construct their past in opposition to the present, a process that allows them to make their earlier experience of social marginalization more bearable. the analysis of these memories also enables us to focus on the discourses on being and having been a worker in argentina.
De la vida en la Quema al Trabajo en las calles: El cirujeo Ciudad de Buenos Aires
Perelman,Mariano Daniel;
Av?? , 2008,
Abstract: the aim of this article is to analyze the way cirujeo- the informal collect of garbage- is made at buenos aires city. for this analyze it is consider the history of the activity, the relations between different actors and the forms in which the formal activity took ahead. it is emphasized in last military government period because since the implementation of a battery of actions by the military goberment the activity has been radically transformed.
Gianni Vattimo, el último comunista
MARIANO LEIRO,Daniel;
Utopìa y Praxis Latinoamericana , 2007,
Abstract: this paper presents some of the ideas from gianni vattimo?s book, ecce comu. what many people have viewed as a radicalization toward the left in the ethical-political reflection of this italian thinker is not only a discourse that seeks to develop in a crisis situation like the present, the consequences of the close ties among philosophy, politics and religion, which in the 50s, represented vattimo?s primary concern. finally, reasons are reconstructed by means of which a post-metaphysical philosophy could justify the idea according to which rediscovery of a communism liberated from the dogma of objectivity and development might be the best alternative for opposing capitalism in the current conditions of late modernity
Gianni Vattimo, el último comunista
Daniel Mariano Leiro
Utopia y Praxis Latinoamericana , 2007,
Abstract: Este trabajo tiene la intención de presentar algunas de las ideas del libro Ecce Comu de Gianni Vattimo. Lo que muchos han visto como una radicalización hacia la izquierda en la reflexión ético-política del pensador italiano de los últimos a os, no es sino un discurso que busca desenvolver en una situación de crisis como la presente, las consecuencias del estrecho vínculo entre filosofía, política y religión que ya en los 50, representaba para Vattimo la principal de sus preocupaciones. Finalmente, se reconstruyen las razones por las que una filosofía posmetafísica podría justificar la idea según la cual el redescubrimiento de un comunismo liberado del dogma de la objetividad y el desarrollo, sería la mejor alternativa para oponer al capitalismo en las actuales condiciones de la tardo-modernidad
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