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1
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...
2
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...
3
tesis de maestría
Publicado 2010
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Electroless Ni-P coatings have been widely used due to their good combination of properties such as hardness, wear resistance and corrosion resistance. The addition of dispersed hard micro-particles into the Ni-P matrix has led to the development of composite coatings. Ni-P composite coatings exhibit an improved hardness and wear resistance properties; however, there is still a disagreement among researches on the corrosion behavior of composite Ni-P coatings. The present investigation involves the synthesis, characterization and a comparative study of the corrosion resistance in NaCl 3,5% of electroless Ni-P and Ni-P-SiC deposits obtained by either prepared or commercial electrolytic nickel/hypophosphite based baths. The characterization of deposits involved studies about morphology by SEM, chemical composition by energy-dispersive X-ray spectroscopy (EDX) and glow discharge optical emi...
4
tesis de maestría
Publicado 2010
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Electroless Ni-P coatings have been widely used due to their good combination of properties such as hardness, wear resistance and corrosion resistance. The addition of dispersed hard micro-particles into the Ni-P matrix has led to the development of composite coatings. Ni-P composite coatings exhibit an improved hardness and wear resistance properties; however, there is still a disagreement among researches on the corrosion behavior of composite Ni-P coatings. The present investigation involves the synthesis, characterization and a comparative study of the corrosion resistance in NaCl 3,5% of electroless Ni-P and Ni-P-SiC deposits obtained by either prepared or commercial electrolytic nickel/hypophosphite based baths. The characterization of deposits involved studies about morphology by SEM, chemical composition by energy-dispersive X-ray spectroscopy (EDX) and glow discharge optical emi...
5
artículo
Publicado 2015
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The results point out some effects of the ovaric hormones like substance over the early embryological development. Estrogens show a tendency to decrease the egg segmentation rate and to decrease the mucin coat around the egg. In the other hand, progesterone produces only increase of the mucin coat.
6
artículo
Publicado 2015
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The results point out some effects of the ovaric hormones like substance over the early embryological development. Estrogens show a tendency to decrease the egg segmentation rate and to decrease the mucin coat around the egg. In the other hand, progesterone produces only increase of the mucin coat.
7
artículo
Publicado 2022
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This research develops a microbicidal aqueous paint to prevent infections on high-touch surfaces. Based on the experimental tests, two chemical formulations were proposed consisting of an acrylic latex resin, silicone resin, titanium oxide, zinc omazide, copper oxide nanoparticles and additives. Th e results showed that the formulation 2 paint presented good homogenization, gloss and stability, its average drying time is 30 min, it has adequate metal coating thickness (49.2 μm) and viscosity (60 s in Ford No. 4 cup), according to the standards ASTM D 1186 01 and ASTM D 1200, respectively; Based on these characteristics, it is considered to be of acceptable quality. Th e bioassays carried out with bacteria of Staphylococcus aureus Rosenbach, 1884 and Escherichia coli (Escherich, 1885) by the incorporation method, showed that the two formulations have antifungal and antimicrobial properti...
8
artículo
HY-80 steels; HY-130, such as HP9-4-20; 10Ni-Cr-Mo-Co are the strongest of the special tenacity and highest creep resistance properties, which have been developed for use in critical hydrospace and aerospace applications. In HY-80 type steel, the alloying elements that give high characteristics to the steels, in turn, increase the hardening power and therefore their tendency to crack. The relationship of the microstructure to the toughness property is evaluated for the welded metal and the region of the heat affected zone. SAW, SMAW or EBW welding processes are used in the manufacture of metal structures with these types of materials, however, in repairs or maintenance, the manual metal arc process with low hydrogen coated electrodes, with an adequate sequence and prior control to the qualification of the welder as well as the process in particular, allow presenting this work with satisf...
9
artículo
Publicado 2011
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This paper deals with the scale development of a prototype of a clavicle from tagua plant, which was subjected to mechanical testing and in vitro biocompatibility tests in this part of the work emphasizes the biocompatibility tests performed. The biocompatibility of a biomaterial depends on various factors such as their surface characteristics, its structural composition and the coatings used on them. The analysis of the biocompatibility of the biomaterial from tagua plant developed by in vitro assays using cultured cell line HOS from human osteosarcoma cells were cultured in RPMI 1640 supplemented with 10% fetal of tagua. Biomaterial samples were subjected to evaluate cell proliferation by microscopic counting in a Neubauer chamber at different times, different concentrations of bone powder allowed to evaluate the cytotoxicity by the addition of MTT and reading in spectrophotometer; als...
10
artículo
Publicado 2011
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This paper deals with the scale development of a prototype of a clavicle from tagua plant, which was subjected to mechanical testing and in vitro biocompatibility tests in this part of the work emphasizes the biocompatibility tests performed. The biocompatibility of a biomaterial depends on various factors such as their surface characteristics, its structural composition and the coatings used on them. The analysis of the biocompatibility of the biomaterial from tagua plant developed by in vitro assays using cultured cell line HOS from human osteosarcoma cells were cultured in RPMI 1640 supplemented with 10% fetal of tagua. Biomaterial samples were subjected to evaluate cell proliferation by microscopic counting in a Neubauer chamber at different times, different concentrations of bone powder allowed to evaluate the cytotoxicity by the addition of MTT and reading in spectrophotometer; als...
11
artículo
Publicado 2018
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SnO2 electrodes doped with Sb were prepared, supported on porous titanium sheets by impregnation, sintering and thermal decomposition of precursor solutions with different mass percentages of Sn and Sb (Sn: Sb = 9:1 and Sn: Sb = 7:3). The electrodes were coated with a layer of ß-PbO2 obtained by anodic electrodeposition method at 65 ° C and a current density of 30 mA cm-2, for 30 minutes. The electrodes were characterized by Raman spectroscopy, scanning electron microscopy, and cyclic voltammetry. The results obtained showed that the catalyst with the highest content of Sn provides the optimal conditions for the interlayer formation between Ti and PbO2 , such as the formation of a homogeneous film, low overpotentials for the chlorine evolution reaction and stability at neutral pH. The synthesized PbO2 film presented a pyramidal shape morphology, according to the Raman spectrum; it has ...
12
tesis de grado
Publicado 2019
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This paper presents the proposal of export of porcelain tiles to the US market, specifically to distributors who import both red and white body tiles in their various sizes. The first chapter describes the profile of the country of destination, relevant socio-economic political characteristics and analysis of the consumer of tiles. Also, the demand for the product explaining the level of import and national production they have in ceramic and porcelain tiles. As well as, the manufacturer's capacity and its quality parameters that can meet all market requirements are detailed such us ANSI and ASTM parameters. In the second chapter, the marketing strategy is presented to achieve the proposed objectives, both enhancing the quality of the product, the competitive price, the distribution channel to develop and the promotional strategy that is mostly linked to the work of the US importer. Ther...
13
artículo
Publicado 2022
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Dark chocolate coatings contain a high percentage of cocoa, which is pleasing to the consumer’s taste. The aim of the research was to develop a bitter-type chocolate coating from the combination of CCN51 and super tree cocoa. In this study, an experimental method, with 18 treatments was applied. In the sensory analysis a hedonic scale test with 30 untrained judges and 15 trained ones was carried out, applying a completely random unifactorial design. The judges determined that T1 treatment with a content of 70% cocoa liquor, had a mean value of 3.8, while the value for the untrained judges was not significance. A bromatological analysis of the best treatment was made based on the NTE INEN 621:2010, resulting in moisture content of 37.86%, fat 9.26%, protein 2.04% and ash 99.38%, defatted cocoa dry extract 98.41%, dry extract of total cocoa and microbiological results less than 100 ufc.m...
14
Publicado 2019
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En presente Trabajo de Suficiencia profesional tiene como finalidad optar el Título Profesional de Ingeniero Civil, experiencia adquirida con el cargo de Asistente de obra de arte de la Obra: “Continuación y culminación del proyecto de irrigación Amojao” trabajos que vienen siendo ejecutados hasta la fecha en la provincia de Bagua, departamento de Amazonas. La Experiencia Profesional que se sustenta en este informe fue realizada como staff de profesionales del Consorcio Bagua, entre las empresas Construcción y Administración S.A (CASA) y Hidalgo E Hidalgo S.A. (HeH Constructores). En las principales actividades que desarrollé con el cargo en mención, tanto en gabinete y campo, usé los conocimientos académicos impartidos en las aulas de la Universidad y Normatividad Peruana vigente, a fin de obtener los mejores resultados en el campo de la Ingeniería Civil, a continuación ...
15
tesis de grado
Publicado 2025
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El objetivo de estudio fue comparar el CHROMagar ESBL y el ChromoSelect agar ESBL para la detección de bacterias productoras de betalactamasas de espectro extendido aislado de muestras clínicas en Lima 2024. Materiales y Métodos: Esta investigación fue observacional y se desarrolló con 133 cepas de enterobacterias aisladas de urocultivo. Se siguieron recomendaciones de la guía CLSI M100-S24 para la detección de BLEE. Su comparó los resultados del cultivo bacteriológico de ChromoSelect agar ESBL versus CHROMagar ESBL mediante el análisis de las pruebas diagnósticas. Resultados: Del total de cepas incluidas 95% fueron cepas de Escherichia coli y el perfil de resistencia más frecuente se observó para cefalosporinas como cefalotina (97%), cefazolina (98%), cefepime (96%), ceftazidima (100%) y ceftriaxona (98%). 101 resultados fueron positivos para ambos métodos, sin embargo, en...
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17
tesis de grado
Publicado 2014
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Undoubtedly, the profound changes that have occurred in society worldwide in recent decades have created an urgent need to review and modify some aspects of business, so that Corporate Social Responsibility is gaining a presence increasingly important in the business sector. In that sense, the so-called Corporate Social Responsibility has become one of the key points that any public or private entity may overlook, including those native to countries which have not yet released the scope of the same. Such is the case of Peru, where there is still no corporate conscience or a legal framework to meet current requirements regarding Corporate Social Responsibility, as happens in other countries. To not go that far, in other Latin American countries such as Costa Rica, Argentina, Colombia and Chile, and there have been attempts to provide compulsory for Corporate Social Responsibility through ...
18
tesis de grado
Publicado 2025
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La presente tesis aborda el análisis integral de los morteros usados para revestimiento, con énfasis en la evaluación de la factibilidad de implementar polvo de mármol en diferentes porcentajes (5%, 10% y 15%) en la mezcla, con el objetivo de mejorar su resistencia contra el salitre. En primer lugar, se procedió a realizar la caracterización del agregado fino mediante ensayos de contenido de humedad, peso unitario y granulometría, siguiendo la normativa correspondiente. Luego, se realizó el diseño de mezcla conforme a las especificaciones de la N.T.P. 334.051 para calcular las proporciones de los materiales. En esta investigación, el agregado fino se reemplazará por polvo de mármol en los diferentes porcentajes mencionados (0%, 5%, 10% y 15%), garantizando que la mezcla mantenga una trabajabilidad y consistencia adecuadas. Para determinar la resistencia a la compresión, se e...
19
tesis de grado
Publicado 2024
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Los recubrimientos zinc son ampliamente empleados para proteger piezas a base de acero de bajo carbono contra la corrosión debido a que pueden actuar como barrera y ánodo de sacrificio. Sin embargo, el zinc es un metal relativamente blando por lo que su resistencia a la abrasión debe ser mejorada si se desea prolongar el tiempo de vida útil. Los recubrimientos compuestos consisten de una matriz metálica con micro/nano partículas de segunda fase dispersas. Son una alternativa prometedora para mejorar las propiedades anticorrosivas y las propiedades mecánicas (dureza, abrasión). El método de de la electro codeposición consiste en depositar electrolíticamente un recubrimiento compuesto a partir de un baño de deposición que contiene partículas de segunda fase en dispersión. La morfología, estructura cristalina, dureza y de resistencia a la corrosión estarán en relación a l...
20
tesis de grado
Publicado 2022
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At present, in vitro digestion models are increasingly used by industries such as food and pharmaceuticals, to evaluate the bioavailability of active compounds present and / or incorporated in food and pharmaceutical products. The aim of this work was to produce, by ionic gelation, pectin microparticles containing sacha inchi oil electrostatically coated with bovine blood proteins. Furthermore, its bioaccessibility was determined using in vitro gastrointestinal digestion. The results for the size and encapsulation efficiency of uncoated microparticles were 186.94 ± 12.63 ?m and 81.63 ± 2.62%, respectively. After coating, it was observed that coated microparticles with bovine blood decreased in size (166.37 ± 19.07 ?m). Likewise, for coated microparticles, values of 57.58 ± 1.20% and 22.20 ± 0.64% were registered for proteins and lipids, respectively. The bioaccessible amounts of pro...
