1
artículo
Publicado 2018
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En el presente trabajo se realiza un estudio sobre las potencialidades de producir ácido cítrico en la provincia de Camagüey - Cuba, debido a su amplio uso como materia prima en diferentes industrias como: alimentaria, farmacéutica y química. Los resultados muestran como mejor fuente de sustrato el bagazo de caña debido a su alta disponibilidad en el mercado y por contar con un alto contenido de azúcar en su composición. En cuanto a los microrganismos empleados para la fermentación, el Aspergillus niger destaca como el más utilizado, existiendo disponibilidad en el territorio. De forma general, el uso de estos residuales reduciría, considerablemente, el costo de producción del ácido cítrico.
2
artículo
Publicado 2018
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En el presente trabajo se realiza un estudio sobre las potencialidades de producir ácido cítrico en la provincia de Camagüey - Cuba, debido a su amplio uso como materia prima en diferentes industrias como: alimentaria, farmacéutica y química. Los resultados muestran como mejor fuente de sustrato el bagazo de caña debido a su alta disponibilidad en el mercado y por contar con un alto contenido de azúcar en su composición. En cuanto a los microrganismos empleados para la fermentación, el Aspergillus niger destaca como el más utilizado, existiendo disponibilidad en el territorio. De forma general, el uso de estos residuales reduciría, considerablemente, el costo de producción del ácido cítrico.
3
artículo
Mathematical modelling applied to batch milling (at experimental level), is a very important tool to simulate and predict the granulometric yield of a given treated ore; this means, for a given duration of milling operation, to obtain an estimate of the corresponding granulometric analysis, which can then be tested with real data later on, to verify the estimates. The model involves the selection and fracture functions depending on each mesh size in the ore distribution. This will allow the prediction of effective and reliable results, saving costs and more importantly, time, without the need to perform the milling process for each prediction of batch milling.
4
artículo
Publicado 2017
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El modelo matemático aplicado a molienda batch (a nivel laboratorio), es una herramienta muy importante para llegar a simular y luego predecir el producto granulométrico de cierto mineral tratado; esto es por cada cierto intervalo de tiempo transcurrido de molienda, obtener su respectivo análisis granulométrico reflejado a nivel laboratorio, que luego será corroborado con datos reales y además poder verificar su buena aproximación. El modelo involucra a las funciones selección y fractura quienes son constituidos por los tamaños granulométricos de cada malla en la referida distribución mineral. Consiguiendo de esta manera predecir en forma efectiva y confiable, evitando costo y sobre todo tiempo, sin la necesidad de realizar el proceso de molienda para cada predicción de molienda batch.
5
artículo
Publicado 2008
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Introducción: En Perú la incidencia de glomeruloesclerosis focal y segmentaria primaria ha aumentado considerablemente durante la última década y actualmente es la primera causa de glomerulonefritis primaria en adultos. Por su prevalencia y alta probabilidad de progresar a insuficiencia renal crónica terminal, se buscaron factores con valor pronóstico para supervivencia renal y remisión de proteinuria. Pacientes y métodos: Cohorte histórica de 44 pacientes. Estudiamos las características clínicas e histológicas al momento de la biopsia renal y la función renal al seguimiento. ≥Los desenlaces principales fueron: deterioro renal (incremento de creatinina 50% y/o insuficiencia renal terminal) y remisión de proteinuria (parcial 0,3-3,49 g/día y completa < 0,3 g/día). Se usaron curvas de Kaplan-Meier y regresión multivariable de Cox. Resultados: El 59% de los pacientes fuer...
6
artículo
Publicado 2020
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This investigation proposes a lean model of production management for a small and micro enterprise (SME) dealing in packaging production in the auto parts sector, with the purpose of increasing efficiency in its production line. To this end, this model integrates study method tools and SMED, seeking to reduce waiting times and unnecessary operations, which have been identified as causing the problem on the basis of an initial diagnosis of the situation. Furthermore, to support and guarantee success in implementing these tools, John Kotter's Change Model is used. After two months of implementation, the results showed a 50% reduction in setup operation time and a 32% decrease in filing operation time, which are bottlenecks in the production process. Thus, with the new indicators, the line efficiency increased by 7% from the initial situation, thus showing improvement.
7
artículo
Publicado 2020
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Today, many small and medium enterprises (SMEs) either go out of business or see their growth being stalled due to poor activity management and organization, which is why they are often unprepared to engage against large companies leading their competitive markets. This study aims to develop a comprehensive management model, exclusively designed for SMEs in the jewellery sector, which may encompass all areas that create value and make them competitive. The development of this comprehensive management model was deployed in 21 steps classified into three tiers based on three major philosophies. This study uses lean manufacturing to identify activities that add value and reduce waste, and lean green was used to provide the environmental care and culture approach required for a friendly and fair workplace environment. The selected scenario is a jewelry workshop, wherein techniques and tools ...
8
artículo
Publicado 2020
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This paper proposes an optimization model aimed at increasing production capabilities at a small-sized textile business dedicated to manufacturing polo shirts, while reducing order fulfillment issues, including incomplete orders and late deliveries. Hence, an assessment identified downtimes from unnecessary transportation travel, time spent looking for materials, and excessive losses due to cutting fabric errors. In this light, the study focused on selecting adaptable tools, such as 5S, Plant Layout, and Method Study, which may help improve production capabilities and address these situations. However, to guarantee that the objectives set forth are being met, the organizational culture must also be identified and improved so that it may serve as the foundation for the optimization model. Then, the proposed model will be validated to determine whether the selected operating tools supporte...
9
artículo
Publicado 2020
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Currently, there is a large percentage of small and medium-sized enterprises (SMEs) in the Peruvian textile market that show economic loss because of the payment of penalties to customers, which are incurred owing to the delay in the delivery of order batches. This is due to poor production management and a lack of focus. The manufacturing sector is essential because of its high contribution to the country's gross domestic product. Currently, SMEs do not employ methodologies that help improve production and process management as they do not realize how important and necessary the methodologies are, in addition to how complex these may be. Therefore, this paper will propose a production management model designed for SMEs in this sector, based on Lean methodology where the objective is time reductions and production increases as well as exerting changes to the organizational culture. Thus,...
10
artículo
Publicado 2020
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This article examines the problem of production line delays in a textile small- and medium-sized enterprise (SME) that produces polyester fibre from recycled bottles, based on orders. Factors that have resulted in production line delays include prolonged unscheduled maintenance time, and preparations and adjustments prior to operating the equipment. To address the problem, a model was developed applying lean manufacturing tools through change management, with the aim of increasing equipment availability and useful life. To validate the model, a pilot was developed to determine how the increase in equipment availability helps reduce delays in the production line, which eventually improves completion of customer orders.
11
artículo
Publicado 2020
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The focus of this research is to establish control and planning management in the sewing production process of lingerie clothing to better prepare companies for demand growth. The lack of improvement tools in this sector, the lack of staff training and a lack of quality culture has led to companies, especially MYPES, not being able to meet the established delivery times and non-fulfillment of orders with the customers, which represents 80% of dissatisfied orders due to the limited production capacity and non-productive time in the plant. This problem is due to limited production capacity, deficient production planning, and lack of materials. In order to solve this problem, industrial engineering tools were used. The application of these tools improved production from 79% to 95%.
12
artículo
Publicado 2025
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The implementation of renewable energy is a viable option to reduce the use of fossil fuels and polluting emissions. Biomass is an excellent renewable energy source and is cleaner than coal. It can be obtained from organic inputs such as wood and agricultural waste and, if used sustainably, can meet the energy needs of various sectors. Densification is a technology with the potential to convert lignocellulosic waste into clean and sustainable solid biofuels. Densification involves compacting loose biomass particles using a mechanical press to produce sustainable solid biofuels with low pollutant content that are not dependent on fossil fuels. The important parameters during the manufacturing process are pressure, temperature, residence time in the press and shape of the briquettes. The production of briquettes imparts certain important properties to the briquettes, such as mechanical str...
13
artículo
Publicado 2020
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Objectives: To evaluate the capacity of the hyperimmune llama serum (Lama glama) to neutralize the lethal activity of Bothrops atrox venom in laboratory mice. Materials and methods: Mean lethal dose (LD50 ) was calculated from a Bothrops atrox venom sample pool from Peru. The antibody titers were measured by ELISA assay; and the immune serum neutralization potency was measured by calculating the mean effective dose (ED50) during the immunization period. Results: The venom’s LD50 was 3.96 ?g/g; similar to what was found in other studies about Bothrops atrox carried out in Peru. The titers of antibodies against the venom increased rapidly in the llama, demonstrating a fast immune response; however, the neutralization capacity increased slowly and required several doses and immunization reinforcements, obtaining a ED50 of 3.30 ?L/g mouse and a neutralization potency of 3.6 mg/mL after 15 ...
14
artículo
Publicado 2021
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El texto completo de este trabajo no está disponible en el Repositorio Académico UPC por restricciones de la casa editorial donde ha sido publicado.
