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1
artículo
Publicado 2012
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Scallion (Allium fistulosum) is a highly perishable green vegetable due to its moisture content, its high metabolic rate and their poor conditions of post-harvest during to harvest and transport. The objective of this research was to determine the relationship between visual deterioration´s product and changes generated in the mechanical and acoustic properties of the same. The scallion grown in Aquitania, Boyacá Colombia was stored under different conditions of storing: vacuum packed (10 mbar) and unpacked (HR 68%) and storage temperature 4 ºC and 16 ºC until deterioration by visual appearance. The acoustic mechanical changes in firmness, crispness and fracture for unpacked scallion and stored at 4 °C occurred on day 15 of storage, and visual deterioration on day 13. For the unpacked product and stored at 16 °C, the biggest change was presented at sixth day. The vacuum packed prod...
2
artículo
Publicado 2012
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Scallion (Allium fistulosum) is a highly perishable green vegetable due to its moisture content, its high metabolic rate and their poor conditions of post-harvest during to harvest and transport. The objective of this research was to determine the relationship between visual deterioration´s product and changes generated in the mechanical and acoustic properties of the same. The scallion grown in Aquitania, Boyacá Colombia was stored under different conditions of storing: vacuum packed (10 mbar) and unpacked (HR 68%) and storage temperature 4 ºC and 16 ºC until deterioration by visual appearance. The acoustic mechanical changes in firmness, crispness and fracture for unpacked scallion and stored at 4 °C occurred on day 15 of storage, and visual deterioration on day 13. For the unpacked product and stored at 16 °C, the biggest change was presented at sixth day. The vacuum packed prod...
3
tesis de grado
Publicado 2025
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El objetivo de este manuscrito fue evaluar el efecto del aceite esencial de muña (Minthostachys mollis) en el recubrimiento a base de harina de maca negra (Lepidium meyenii Walp.) y montmorillonita para prolongar la vida útil del melón (Cucumis melo L.) mínimamente procesado. Los cubos de melón se dividieron en cuatro tratamientos: T1 control (sin recubrimiento), T2, T3 y T4 con 0,1 % v/v, 0,2 % v/v y 0,3 % v/v de aceite esencial de muña respectivamente, además se les adicionó harina de maca (2,5 %) y montmorillonita (0,3 %), posteriormente todos los tratamientos se almacenaron durante 12 días a 5±1 °C. Se analizaron la pérdida de peso, acidez titulable, pH, sólidos solubles totales, color, firmeza, actividad de agua, evaluaciones microbiológicas de mohos y levaduras, Salmonella spp. y Escherichia coli. El T2 mostró menor pérdida de peso (8,7 %) y firmeza (22,3 %), ademá...
4
artículo
Publicado 2015
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The application of edible coatings obtainable from alternative biodegradable materials has gained attention as a promising treatment to prolong the shelf-life of fresh-cut vegetables. Thus, this work aimed to develop a biodegradable coating based on fruit and vegetable residues flour. Immersion coating strategy was studied on the quality of minimally fresh-cut carrots during refrigeration storage by means of weight loss, color variation, pH, titratable acidity and soluble solids content. Better performance was obtained for coated carrots, which exhibited a tendency to have lower whiteness index than uncoated counterparts and enhanced overall quality. Despite a drop in color saturation expressed by chroma values (varying from 59 to 46) was observed, color index presented a positive value for all samples (varying from 13 to 15) indicating orange color preservation throughout storage. Altho...
5
artículo
Publicado 2015
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The application of edible coatings obtainable from alternative biodegradable materials has gained attention as a promising treatment to prolong the shelf-life of fresh-cut vegetables. Thus, this work aimed to develop a biodegradable coating based on fruit and vegetable residues flour. Immersion coating strategy was studied on the quality of minimally fresh-cut carrots during refrigeration storage by means of weight loss, color variation, pH, titratable acidity and soluble solids content. Better performance was obtained for coated carrots, which exhibited a tendency to have lower whiteness index than uncoated counterparts and enhanced overall quality. Despite a drop in color saturation expressed by chroma values (varying from 59 to 46) was observed, color index presented a positive value for all samples (varying from 13 to 15) indicating orange color preservation throughout storage. Altho...
6
artículo
Evaluate the effect of gaseous ozone on physicochemical characteristics, molds and yeasts count and overall appearance of granada. Wonderful variety fruits of granada was collected in a glass chamber where the gas is injected using ozone generator equipment with flow of 500 mg / h and a digital meter for measuring the ozone concentration. A central composite design rotable (CCDR) was used to analyze the effect of the concentration of ozone gas and storage time (p < 0.05) on weight loss, firmness, shell color, soluble solids, mold and yeasts count, total anthocyanins content and overall appearance. It was determined that the concentration of ozone gas had significant effect on the responses studied variables. The quadratic model provided the best fit of data. It was established that the concentration of ozone between 40 - 50 ppm, it allows for the lowest weight loss, low count of molds...
7
artículo
Evaluate the effect of gaseous ozone on physicochemical characteristics, molds and yeasts count and overall appearance of granada. Wonderful variety fruits of granada was collected in a glass chamber where the gas is injected using ozone generator equipment with flow of 500 mg / h and a digital meter for measuring the ozone concentration. A central composite design rotable (CCDR) was used to analyze the effect of the concentration of ozone gas and storage time (p < 0.05) on weight loss, firmness, shell color, soluble solids, mold and yeasts count, total anthocyanins content and overall appearance. It was determined that the concentration of ozone gas had significant effect on the responses studied variables. The quadratic model provided the best fit of data. It was established that the concentration of ozone between 40 - 50 ppm, it allows for the lowest weight loss, low count of molds...
8
artículo
Publicado 2018
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This paper proposes a procedure to minimize electrical losses present in industrial systems, through a specific program developed for this purpose, based on Genetic Algorithm, and written using MATLAB instructions.The minimization is realized with the placement of shunt capacitors connected to the buses. For validation of the proposed method, it is considered accuracy and speed, and the developed program´s results are compared with the results produced by traditional programs. The program avoids leading power factor at the bus connected with the power distribution company and the user may determine buses where he does not want the installation of capacitors. The Genetic Algorithm's fitness, responsible for guiding the optimization process, is the active power loss. Finally, the program is applied to minimize active losses present at an industrial system, 38 buses.
9
artículo
Publicado 2018
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This paper proposes a procedure to minimize electrical losses present in industrial systems, through a specific program developed for this purpose, based on Genetic Algorithm, and written using MATLAB instructions.The minimization is realized with the placement of shunt capacitors connected to the buses. For validation of the proposed method, it is considered accuracy and speed, and the developed program´s results are compared with the results produced by traditional programs. The program avoids leading power factor at the bus connected with the power distribution company and the user may determine buses where he does not want the installation of capacitors. The Genetic Algorithm's fitness, responsible for guiding the optimization process, is the active power loss. Finally, the program is applied to minimize active losses present at an industrial system, 38 buses.
10
tesis de grado
Publicado 2024
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Small and medium-sized companies seek to improve and innovate in all their different processes, since there is more competition, and they all seek to be leaders in the sector in which they operate. However, a problem that involves the entire distribution chain, as well as the profitability of the business, is the return of merchandise. The main objective of this research study was to propose an improvement proposal in distribution management to enhance the number of returns in a wholesale company for the traditional channel using the SMED, Lean Six Sigma and Demand Forecasting. The secondary objectives of this implementation were to analyze and understand the root causes of this problem to address it in the best possible way using diagnostic tools such as the Pareto Diagram and Value Stream Mapping. Likewise, to quantify and measure the impact of this indicator within the company through...
11
tesis de grado
Publicado 2023
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El Producto Interno Bruto (PIB) de América Latina y el Caribe representa aproximadamente el 70% del sector manufacturero. El suministro de productos es vital para las empresas de consumo masivo debido al consumo de la población. Mejorar la logística de la cadena de valor maximiza las oportunidades comerciales. Los productos de higiene se venden bien. La escasez de palés impide la entrega. Este estudio propone un modelo que integra el marco Lean Six Sigma, los principios de Lean Manufacturing y el informe A3 como herramientas de comunicación y seguimiento para garantizar el éxito de la mejora. El aumento de paletas permite una entrega más rápida del producto. El modelo integrado utiliza el diseño para Six Sigma y herramientas de trabajo estandarizadas para diseñar el nuevo proceso y la metodología de reporte A3 para mostrar la importancia del problema, las contramedidas propues...
12
artículo
The coffee industry, coffee shops and restaurants are in constant expansion and growth. Consequently, large amounts of Spent Coffee Grounds (SCG) are generated, which are solid coffee residues obtained after the ground coffee leaching process. This residue can be reused because of its compounds as phenolics. The objective of the present study was to evaluate the effect of extraction time (30-90 min) assisted by ultrasound (45kHz and 50 W), liquid-solid ratio (10-40 ml/g) and ethanol concentration (20-93.8%) in the total phenolic compounds (CFT) content expressed as mg gallic acid/g SCG dry matter. Surface response methodology (MSR) was used, as an efficient technique that minimizes the number of experiments, through the central rotational compound design (DCCR) to determine the effect of these 3 factors and to perform the optimization of the extraction process conditions of total phenoli...
13
artículo
The coffee industry, coffee shops and restaurants are in constant expansion and growth. Consequently, large amounts of Spent Coffee Grounds (SCG) are generated, which are solid coffee residues obtained after the ground coffee leaching process. This residue can be reused because of its compounds as phenolics. The objective of the present study was to evaluate the effect of extraction time (30-90 min) assisted by ultrasound (45kHz and 50 W), liquid-solid ratio (10-40 ml/g) and ethanol concentration (20-93.8%) in the total phenolic compounds (CFT) content expressed as mg gallic acid/g SCG dry matter. Surface response methodology (MSR) was used, as an efficient technique that minimizes the number of experiments, through the central rotational compound design (DCCR) to determine the effect of these 3 factors and to perform the optimization of the extraction process conditions of total phenoli...
14
artículo
The coffee industry, coffee shops and restaurants are in constant expansion and growth. Consequently, large amounts of Spent Coffee Grounds (SCG) are generated, which are solid coffee residues obtained after the ground coffee leaching process. This residue can be reused because of its compounds as phenolics. The objective of the present study was to evaluate the effect of extraction time (30-90 min) assisted by ultrasound (45kHz and 50 W), liquid-solid ratio (10-40 ml/g) and ethanol concentration (20-93.8%) in the total phenolic compounds (CFT) content expressed as mg gallic acid/g SCG dry matter. Surface response methodology (MSR) was used, as an efficient technique that minimizes the number of experiments, through the central rotational compound design (DCCR) to determine the effect of these 3 factors and to perform the optimization of the extraction process conditions of total phenoli...
15
artículo
The coffee industry, coffee shops and restaurants are in constant expansion and growth. Consequently, large amounts of Spent Coffee Grounds (SCG) are generated, which are solid coffee residues obtained after the ground coffee leaching process. This residue can be reused because of its compounds as phenolics. The objective of the present study was to evaluate the effect of extraction time (30-90 min) assisted by ultrasound (45kHz and 50 W), liquid-solid ratio (10-40 ml/g) and ethanol concentration (20-93.8%) in the total phenolic compounds (CFT) content expressed as mg gallic acid/g SCG dry matter. Surface response methodology (MSR) was used, as an efficient technique that minimizes the number of experiments, through the central rotational compound design (DCCR) to determine the effect of these 3 factors and to perform the optimization of the extraction process conditions of total phenoli...
16
artículo
Publicado 2002
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OBJECTIVE: To identify personal, institutional and contextual factors involved in the scientific papers production process by Medical School researchers. MATERIAL AND METHODS: 1) The San Marcos University Research Activities Registry (RAIS) data base created by the Research Council (CSI); and 2) In depth interviews of intentionally selected informers inquiring about various aspects of the scientific production process. RESULTS: During the period 1990 through 2001 from 994 faculty members, 149 (15%) published scientific papers in journals and registered them in the RAIS. Their profile was: males 62%; mean age 58; physicians 2 out of 3; with Doctor or Master Degree and either exclusive dedication or full time faculty 1 of every 2; attached to Research Center/ Institute 60%. The interviews qualitative analysis highlighted the consensus that scientific studies results should be published, bu...
17
artículo
Publicado 2023
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The global consumption of ultra-processed foods (UPF) has experienced a rapid increase, particularly in developed urban environments. This trend has been associated with a rise in the prevalence of non-communicable diseases, suggesting potential risks to human health. Therefore, the study aimed to analyze trends and models of scientific production related to UPF and public health. To conduct the research, 139 documents were gathered from the Scopus database, using keywords such as "ultra-processed food" and "public health." Data were processed using VosViewer and Bibliometrix software to create cienciometric map networks. It is noteworthy that research has been growing from 2020 to 2023, with a total of 123 published articles. Brazil stands out as the country with the highest contribution, with Monteiro CA as the principal and most cited researcher. The two institutions with the highest ...
18
tesis de grado
Publicado 2022
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Wastewater treatment has remained a topic of interest over the years, since this method allows the water to be reused in other activities, since it establishes a process of conversion to "clean water"; however, this water must comply with quality standards that support the healthiness of the water. On the other hand, the treatment systems are still managed through manual processes, in which the variables and parameters of the plant are measured, however, these do not tend to be accurate, which leads to overflows within the system and consequently contaminate the quality of the water. Therefore, the present study aims to analyze the PID control parameters in proportional valves for a wastewater treatment plant filtration process. Also, it was essential to establish a flow chart of plant processes, and then implement sensors and actuators in the filtration process, in turn, equations were ...
19
artículo
Publicado 2020
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The objective of this study is present the guidelines to develop the implementation of an Automated System in order to reduce service times in the processes applicable to the Single Window of Tourism in the Provincial Municipality of Callao, based on the development of Management by Processes. It presents the steps to follow to achieve the implementation of an Automated System and the example is shown in which it was possible to verify that said implementation reduces the attention times in the Provincial Municipality of Callao. With the implementation of an Automated System everyone wins: first, the workers, since they will be able to carry out their tasks in the shortest time and minimize unforced errors; secondly, the Municipality, since it will offer automated and simplified services, and finally the clients, because the costs of administrative procedures will be reduced and because ...
20
tesis de grado
Publicado 2022
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El presente trabajo de investigación servirá para incrementar la producción mediante la mejora de procesos de forma satisfactoria en la empresa Textiles Camones S.A., asimismo el centro de operaciones y las oficinas administrativas están ubicadas en el distrito de Puente Piedra. El objetivo de la mejora de procesos es reducir la cantidad de tela no conforme y calificada internamente como telas defectuosas, mejorando así los indicadores de calidad establecidas por las normas ISO 9001; mediante los planes de mejora se incrementará la productividad, la eficacia, la eficiencia y la efectividad en las diversas etapas del proceso de producción. Por otro lado se realizará un análisis de la situación actual de la empresa en el área de estampado, con la finalidad de determinar los puntos críticos en el proceso productivo mediante las herramientas de mejora, minimizando con ello la pro...
