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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
1

Economic evaluation, strategy and prediction studies of results into beef cattle production using different scenarios /

Romanzini, Eliéder Prates. January 2019 (has links)
Orientador: Euclides Braga Malheiros / Resumo: A pecuária de corte brasileira tem sido pressionada no sentido de cada vez obter melhores resultados, o que força os proprietários a utilizar práticas e manejos específicos, os quais possibilitarão a manutenção dentro da atividade. Este estudo teve como objetivos avaliar o uso de inteligência artificial, mais especificamente redes neurais artificiais (RNA), para predizer resultados futuros tanto da produção de pasto quanto animal. Determinar dentre diversos cenários de recria e terminação de bovinos de corte em pastagens tropicais, qual foi o melhor cenário no que diz respeito aos resultados econômicos. Avaliar dentre diferentes doses de adubação nitrogenada, qual foi aquela que retornou melhores índices econômicos. As RNA se mostraram melhores que as regressões normalmente utilizadas para predizer as produções de pastagem (valores médios obtidos pelo uso das RNA foram 0,84; 0,78 e 0,75 para massa de forragem, porcentagens de folha e colmo, versus 0,74; 0,39 e 0,50 obtidos usando regressão linear múltipla) e animal (0,72 [RNA] e 0,67 regressão). No estudo referente aos cenários, os melhores resultados foram obtidos quando utilizado apenas sal mineral (lucratividade de 26,3%; período de “payback” simples igual à 11 ciclos e taxa interna de retorno de 9,30%) na recria dos bovinos de corte e na terminação, quando as variáveis climáticas possibilitaram via manejo de pastagem o uso de maior taxa de lotação (3,18 UA ha-1) na área. Quando avaliados os efeitos das doses de adubação n... (Resumo completo, clicar acesso eletrônico abaixo) / Abstract: Brazilian beef cattle has been under pression to obtain better results, which drives owners to use specific practices and management, which will allow the maintenance within livestock. This study aimed to evaluate use of artificial intelligence, specifically artificial neural networks (ANN), to predict future results both forage and animal productions. Determine between a lot of rearing and finishing phase scenarios of beef cattle production using tropical pastures, how was the best scenario considering economic results. Evaluate between different nitrogen fertilizers levels, how was there obtained best economic indexes. The ANN was better than regressions normally used to predict forage production (mean values obtained by ANN use were 0.84, 0.78 and 0.75 for forage mass, leaf and stem percentages, versus 0.74, 0.39 and 0.50 obtained using multiple linear regression) and animal (0.72 [ANN] and 0.67 regression). Into study about scenarios, the best results were obtained when used mineral mix just (profitability of 26.3%, simple payback period equal to 11 cycles and internal return ratio of 9.30%) during rearing phase of beef cattle. During finishing phase, the best results occurred when weather variables allowed by pasture handled, the use of higher stocking rate (3.18 AU ha-1) into area. The evaluation of economic results caused by different nitrogen fertilizer levels. Allowed to say that was possible to observe that there was linear increase both on costs, and gross revenue,... (Complete abstract click electronic access below) / Doutor
2

Technologinių vamzdynų kokybės užtikrinimo analizė / Analysis of technological pipeline quality assurance

Adomavičiūtė, Irma 29 June 2007 (has links)
Baigiamajame magistro darbe nagrinėjamos technologinių vamzdynų kokybės vertinimo problemos, kokybės užtikrinimo būtinumas ir priemonės tam tikslui pasiekti. Išnagrinėtas kokybės sąvokų supratimas įvairiose šalyse, pateikiami ISO serijos standartų privalumai ir minusai įmonėse, siekiančiose kokybės tobulėjimo. Išanalizuota užsienio šalių patirtis technologinių vamzdynų tiesimo bei eksploatavimo srityse. Remiantis sprendimų paramos sistemomis išanalizuotos dvi technologinių vamzdynų tiesimo alternatyvos ir parinktas racionalus variantas. Siekiant įvertinti technologinių vamzdynų kokybę, peržvelgus įvairias rekomendacijas, standartus, įstatymus, sudarytas kokybės kontrolės planas. Pateikiamos baigiamojo darbo išvados. / Master’s thesis analyzes issues of technological pipeline quality evaluation, assurance and means to achieve it. It analyzes various understandings of quality issues in several countries, provides ISO quality standard‘s advantages and disadvantages in companies who are seeking to improve their quality. Experience of various countries is analyzed and compared in construction and utilization of technological pipelines. Based on decision support systems two alternatives for construction of technological pipelines are analyzed and an optimum solution is chosen. During evaluation of quality of technological pipelines, various recommendations, standards and laws were evaluated. A plan of measures to control quality is suggested. Final practical implications are provided in conclusions of the thesis.

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