Programa de Pós-Graduação em Engenharia Industrial - PPGEI/ITEC

URI Permanente desta comunidadehttps://repositorio.ufpa.br/handle/2011/10050

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Agora exibindo 1 - 6 de 6

Acesso aberto (Open Access)
Análise de viabilidade econômica da implantação de uma indústria beneficiadora de açaí no município de Abaetetuba/PA
(Universidade Federal do Pará, 2021-10-13) PRAXEDES, Adalberto Malato; CORREA, Alessandro de Castro; http://lattes.cnpq.br/6408989265441974
This work analyzed the economic feasibility of implementing an açaí processing industry in the city of Abaetetuba/PA. A structured interview was carried out with the interested investor group in order to understand their objectives and expectations, as well as the project's premises. The average cost of açaí in the harvest and in the off-season was estimated through a survey in the domestic market. The evaluation was carried out based on the discounted cash flow method, the Net Present Value, the Internal Rate of Return and Payback as feasibility indicators. For the Minimum Attractiveness Rate, the cost of capital was adopted based on the beta calculated by the Capital Asset Pricing Model (CAPM) from daily observations of share prices of companies in the Brazilian food sector from 04/01/2018 to 04/01 /2021 and the Selic rate as a risk-free rate. The Monte Carlo simulation technique was used to analyze the uncertainty associated with different scenarios resulting from variations in demand, in the cost of goods produced in the harvest, in the cost of goods produced in the off-season and in the sale price. The results indicated that the project is viable and suggest that there is a 62.82% chance of generating positive results.
Acesso aberto (Open Access)
Avaliação da resistência ao desgaste do aço hadfield e ferro fundido branco alto cromo em ensaio pino-disco com fragmentação de abrasivo para aplicações na mineração
(Universidade Federal do Pará, 2024-11-12) SILVA, Rute Nara de Jesus Farias da; MACHADO, Paulo Cordeiro; http://lattes.cnpq.br/0133330144786049
Mining, as an industry with processes that include excavation, crushing, and grinding, faces high levels of wear, resulting in component failures, increased energy consumption, and operational costs. Studies indicate that global energy consumption in mining activities is significant, with a large portion used to overcome friction and replace worn parts. The present work investigates the efficiency of different materials, such as Hadfield steel with 15% Mn (Mn15) and high-chromium white cast iron (HCWCI), in resisting abrasive wear, as well as parameterizing the test equipment for the two materials. The Pin-on-Disc Abrasive Wear Test with Abrasive Fragmentation (PDFA) was used to simulate and evaluate the abrasive wear resistance of these materials. The research compares the wear micromechanisms observed in the PDFA test with those found in the jaw crusher test, aiming to identify less complex and more cost-effective ways to evaluate the studied materials. This emphasizes the importance of tests that closely replicate real operational conditions, optimizing material selection while reducing costs, energy consumption, and CO2 emissions in mining. The characterization of the worn samples was performed using optical microscopy and scanning electron microscopy (SEM) in SE, BSE, and EDS modes. The wear rates were 0.0006 g/min for HCWCI and 0.0021 g/min for Mn15 steel. Additionally, similar micromechanisms, such as microgrooving, microcutting, and microcracking, were observed on the surfaces of both materials, comparable to those identified in fixed jaw samples tested under jaw crusher conditions.
Acesso aberto (Open Access)
Efeito da temperatura, tempo e taxa de resfriamento na formação do eutetóide divorciado em soldas de trilhos de aço perlítico
(Universidade Federal do Pará, 2021-06-01) BARBOSA, Matheus dos Santos; MACHADO, Paulo Cordeiro; http://lattes.cnpq.br/0133330144786049
The hardness reduction that occurs at the end of the Heat Affected Zone (HAZ) of welded joints of railway is generated through of the Divorced Eutectoid formation (DE). This transformation happens in the weld during the cooling of the austenite when there is presence of undissolved carbides, which, in turn, act as preexisting cores for the formation of this microstructure, forming a combination of spheroidized cementite + ferrite. In order to understand this microstructural transformation, samples of premium and superpremium rails were tested by dilatometry, with a full factorial Design Of Experiments (DOE) that evaluated the effects of variables temperature, holding time and cooling rate; and their interactions. The samples after thermal cycling were characterized by microhardness test and scanning electron microscopy analysis. The results showed that the highest DE fractions were obtained at higher temperatures (750 °C) and with higher equivalent carbon. However, by increasing the cooling rate, from 1.5 to 9 °C/s, resulted in a reduction of the DE fraction of 49% for the premium rail at 750 °C and 75% for the superpremium rail at 740 °C. Regarding hardness, the behavior was inversely proportional, where the increase in the cooling rate provided an increase in the hardness of the rails (about 21%), in addition, the samples simulated at 740 and 750 °C and cooled to 1.5° C/s showed hardness similar to that was found in the region of lower hardness of rails welded by Flash Butt Weld (FBW). The factors that had the greatest effect on DE formation, in increasing order, were temperature, equivalent carbon and cooling rate.
Acesso aberto (Open Access)
Melhoria do processo de aquisição de equipamentos médicos assistenciais em hospital público
(Universidade Federal do Pará, 2024-12-19) PEREIRA, Guilherme Figueiredo; VIEIRA JÚNIOR, Petrônio; http://lattes.cnpq.br/1958791286192330
Hospitals aim to promote the health of the population through an extensive and complex range of services. Even though the main activity of these institutions is caring for patients, there are a series of managerial and administrative activities necessary to continue providing care to the population, among which the purchasing process stands out. The objective of this work is to propose improvements in the process of acquiring medical-care equipment using Lean Healthcare concepts. To this end, the purchasing process in a public hospital was specifically analyzed, through the analysis of the history of purchasing processes in the electronic auction modality of the price registration system from 2021 to 2022, in addition to documentary and field research , where the inefficiency of this process in the institution was observed. Interviews were carried out with the main people involved in the sectors most active in the acquisition processes. A series of improvement opportunities were observed at several different points in the process, which were adjusted in search of greater efficiency. Based on the information collected, an action plan was prepared to apply improvements, including the development of a SOP to assist in standardizing the acquisition planning process. As a result, there was an improvement in the efficiency of the medical equipment purchasing process at the institution studied by more than 30% in the approval rate of items in the EMH acquisition auction.
Acesso aberto (Open Access)
Produção de chapa plástica a partir do endocarpo de murumuru (astrocaryum murumuru mart.) e poliolefinas recicladas.
(Universidade Federal do Pará, 2021-09-23) LIMA, William Arthur dos Santos de; DIAS, Carmen Gilda Barroso Tavares; http://lattes.cnpq.br/2113791118142177
In the Amazon, a huge amount of non-wood lignocellulosic waste is obtained from the production of oils and butters from pressing of seeds and almonds. The economic and productive viability of plastic sheet has the proposal to close the production cycle of murumuru assets (Astrocaryum murumuru Mart), the two largest companies producing murumuru butter in the metropolitan region of Belem generated 410ton of tegument in the biennium (2019/2020), from the extraction of butter for the cosmetic industry. It also seeks to contribute more options for recycling high-density polyethylene (PEAD) and polypropylene (PP) packaging, used in the storage of oils. The objective of this work was achieved through the production process of plastic plates with properties compatible with the plates currently marketed, positive implications for the environment.
Acesso aberto (Open Access)
Protótipo de um secador de grãos rotativo compacto com sistema fotovoltaico
(Universidade Federal do Pará, 2023-08-06) RODRIGUES, Benedito de Jesus da Silva; DIAS, Carmen Gilda Barroso Tavares; http://lattes.cnpq.br/2113791118142177 País de Nacionalidade Brasil
The industrial bioeconomy of açaí, a fruit native to the Amazon, produces food with antioxidant phenolic compounds and lipids. Fractions of the pulping by-product are used to generate bioenergy and are being researched as biopolymers, filler for making furniture and architectural materials. With this in mind, two rotary grain dryers were designed: the first is a commercial model (capable of drying 14 kg of açaí kernels) and the second is a compact model (capable of drying 1.0 kg of material). Due to the practicality of its use in the laboratory, the compact model was selected for manufacture. This prototype consists of: a micro motor (with adjustable torque and frequency, 40W of electrical power and bivolt 127/220VAC), which drives a rotating drum (measuring 24cm in diameter by 24cm in length) at a rotation speed of 57.6rpm, an air heating system (consisting of: air confinement chamber, thermal heating module and temperature controller). The equipment is autonomous for forestry use, with a photovoltaic electricity generation system (configuration: a 60Ah battery, a 540WP monocrystalline photovoltaic module, a 40A PWM charge regulator and a 1000W DC/AC inverter). In the laboratory experiments, 1 kg of açaí kernels were dried (for a period of two hours and forty-three minutes), after which the following fractions were obtained: 5% fiber, 1% insoluble particulate matter from the mesocarp and 63% endocarp. The compact rotary grain dryer is a versatile technology that could be used in biomaterials research in the future, contributing to the region's sustainability and macro-economy.

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