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Tópicos Sugeridos dentro de su búsqueda.
1
artículo
Publicado 2023
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The construction industry requires concrete with adequate post-cracking behavior for applications such as tunnels, bridges, and pavements. For this reason, polypropylene macrofibers are used, which are synthetic fibers that fulfill the function of providing residual strength to concrete. In this study, an experimental plan is carried out to evaluate the bending behavior of concrete reinforced with polypropylene fibers using the four-point bending test according to ASTM C1609. Three fiber dosages (3.6, 7.2 and 10.8 kg/m3) and three fiber lengths (40, 50, and 60 mm) were used. The use of macro polypropylene fibers increased the post-cracking behavior of concrete. In addition, based on the experimentally obtained results and available literature data, a multivariable equation was developed to predict the concrete toughness as a function of the volume, slenderness, and modulus of elasticity ...
2
artículo
Publicado 2017
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El objetivo del presente estudio fue evaluar la relación de la fibra detergente neutro/ proteína cruda sobre la excreción urinaria de derivados de purinas (DP) en alpacas. El diseño experimental fue un Cuadrado Latino 3x3. Se utilizaron tres alpacas Huacaya machos de 2.5 años de edad, confinados en corrales individuales. El alimento fue suministrado una vez al día y con agua ad libitum. Se trabajó con tres tratamientos a base de heno de avena, donde las relaciones de fibra/proteína se obtuvieron de acuerdo a las proporciones de tallos y hojas. Los tratamientos fueron: T1, hojas de heno de avena, 58.24% de fibra detergente neutro (FDN) y 6.8% proteína cruda (PC); T2, hojas y tallo de avena, 66.31% FDN y 6.36% PC; T3, tallos de avena, 70.22% FDN y 5.75% PC. Cada periodo experimental tuvo una duración de 14 días (10 de acostumbramiento y 4 de evaluación). Los niveles de DP en or...
3
artículo
Publicado 2022
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“Cotton is the most widely used natural fiber for textiles; however, the capacity of cotton fibers to absorb large amounts of moisture, retain oxygen, and have a high specific surface area makes them more prone to microbial contamination, becoming an appropriate medium for the growth of bacteria and fungi. In recent years, the incorporation of silver nanoparticles in textile products has been widely used due to their broad-spectrum antibacterial activity and low toxicity towards mammalian cells. The aim of the current study is to continue the assessment of our developed nanocomposite and evaluate the antibacterial and antifungal activity of the nanocomposite based on silver nanoparticles and carboxymethyl chitosan (AgNPs-CMC) against Escherichia coli, Staphylococcus aureus, and Candida albicans, evaluated by the well diffusion method. The antibacterial activity against E. coli and S. a...
4
artículo
Publicado 2022
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Cotton is the most widely used natural fiber for textiles; however, the capacity of cotton fibers to absorb large amounts of moisture, retain oxygen, and have a high specific surface area makes them more prone to microbial contamination, becoming an appropriate medium for the growth of bacteria and fungi. In recent years, the incorporation of silver nanoparticles in textile products has been widely used due to their broad-spectrum antibacterial activity and low toxicity towards mammalian cells. The aim of the current study is to continue the assessment of our developed nanocomposite and evaluate the antibacterial and antifungal activity of the nanocomposite based on silver nanoparticles and carboxymethyl chitosan (AgNPs-CMC) against Escherichia coli, Staphylococcus aureus, and Candida albicans, evaluated by the well diffusion method. The antibacterial activity against E. coli and S. aure...
5
artículo
Publicado 2022
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Cotton is the most widely used natural fiber for textiles but its innate capacity to absorb moisture, retain oxygen, and high specific surface area make it more prone to microbial contamination, becoming an appropriate medium for the growth of bacteria and fungi. In recent years, the incorporation of silver nanoparticles in textile products has been widely used due to their broad-spectrum antibacterial activity and low toxicity towards mammalian cells. The aim of the current study is to synthesize and characterize a nanocomposite based on silver nanoparticles and carboxymethyl chitosan (AgNPs-CMC), which was utilized to provide a functional finish to cotton fabric. The scanning electron microscope (SEM) to produce a scanning transmission electron microscope (STEM) image showed that the nanocomposite presents AgNPs with a 5–20 nm size. The X-ray diffraction (XRD) analysis confirmed the ...
6
artículo
Publicado 2022
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Cotton is the most widely used natural fiber for textiles but its innate capacity to absorb moisture, retain oxygen, and high specific surface area make it more prone to microbial contamination, becoming an appropriate medium for the growth of bacteria and fungi. In recent years, the incorporation of silver nanoparticles in textile products has been widely used due to their broad-spectrum antibacterial activity and low toxicity towards mammalian cells. The aim of the current study is to synthesize and characterize a nanocomposite based on silver nanoparticles and carboxymethyl chitosan (AgNPs-CMC), which was utilized to provide a functional finish to cotton fabric. The scanning electron microscope (SEM) to produce a scanning transmission electron microscope (STEM) image showed that the nanocomposite presents AgNPs with a 5–20 nm size. The X-ray diffraction (XRD) analysis confirmed the ...
7
artículo
Publicado 2020
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High-surface-area carbon-based capacitors exhibit significant advantages relative to conventional graphite-based systems, such as high power density, low weight, and mechanical flexibility. In this work, novel porous carbon-based electrodes were obtained from commercial cotton fibers (CFs) impregnated with graphene oxide (GO) at different dipping times. A subsequent thermal treatment under inert atmosphere conditions enables the synthesis of electrodes based on reduced GO (RGO) supported on carbon fibers. Those synthetized with 15 min and 30 min of dipping time displayed high specific capacitance given their optimal micro-/ mesoporosity ratio. Particularly, the RGO/CCF15A supercapacitor reports a remarkable specific capacitance of 74.1 F g−1 at 0.2 A g−1 and a high cycling stability with a 97.7% capacitive retention, making this electrode a promising candidate for supercapacitor desi...
8
artículo
Publicado 2021
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This study aims to design and validate a nutritional recipe for a snack made of Green Banana (Musa paradisiaca) Peel Flour (GBPF) and to assess the nutritional composition and microbiological quality of the flour. Banana peel, a food industry by-product, is a nutritious, low-cost material available for all year. Banana peel flower could be used as a functional ingredient due to its high fiber content and good functional properties. In general, university students have a deficient dietary fiber intake due to altered dietary patterns; thus, this study was focused on this population. The GBPFs were obtained from the peels of pre-climacteric bananas by fluidized bed (FDB) dryer, after which, microbiological, proximate, and dietary fiber analyses were applied. It was designed the nutritional recipe for the snack taking into account the energy and dietary fiber nutritional requirements of the ...
9
artículo
Publicado 2020
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Two commercial varieties of Peruvian Pouteria lucuma fruits namely “Seda” and “Beltrán” were characterized in terms of their physicochemical properties as well as their primary and secondary metabolites content and profile. Free sugars, dietary fiber, and starch comprise the main components in both varieties. Phenolic compounds derived from flavanoids (flavan-3-ols), gallic acid, and their derivatives were identified. Xanthophylls were tentatively identified based on their UV-vis spectra and enclosed the majority of the carotenoids found in lucuma. Additionally, both varieties showed to be sources of lipophilic compounds such as tocopherols (?, ?, and ?) and triterpenoids. The triterpenoid ?-amyrin was identified in a Pouteria fruit for the first time. The in vitro antioxidant capacity (AoxC) of the lipophilic fraction represented approximately 30% of the total AoxC. These resul...
10
artículo
Publicado 2024
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Peruvian fava beans (PFB) are used in traditional cuisine as a nutrient-rich, flavorful, and textural ingredient; however, little is known about their industrial properties. This study evaluated the physicochemical, nutritional, and techno-functional characteristics of PFB varieties: Verde, Quelcao, and Peruanita. PFB exhibited distinct physical characteristics, quality parameters, and morphology. The color patterns of the seed coat and the hardness were the main parameters for distinguishing them. Nutritionally, all three samples exhibited high protein (23.88–24.88 g/100 g), with high proportion of essential amino acids, high dietary fiber (21.74–25.28 g/ 100 g), and mineral content. They also contain polyphenols (0.79–1.25 mg GAE/g) and flavonoids (0.91–1.06 mg CE/g) with antioxidant potential (16.60–21.01 and 4.68–5.17 µmol TE/g for ABTS and DPPH assays, respectively). Th...
11
artículo
Publicado 2024
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The germination of quinua improves the content of polyphenols, flavonoids, amino acids, dietary fiber, vitamin E, antioxidants and other bioactive compounds, making this pseudocereal a nutritious and healthy source for the preparation of functional foods. The aim of this work was to assess the effect of the germination of quinua on the nutritional, biological and functional properties, in turn to be able to analyze the potential that this golden grain has in the food industry. For the systematic review, the databases (Scopus, Scielo and Science Direct) were used, following the PRISMA guideline and the PIO strategy (Population, Intervention, Outputs), which helped to formulate the search equations and to identify the most relevant articles of the last 5 years. The results of the bibliometric analysis showed that the germination of quinua improves the nutritional properties and the content...
12
artículo
Publicado 2024
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The germination of quinua improves the content of polyphenols, flavonoids, amino acids, dietary fiber, vitamin E, antioxidants and other bioactive compounds, making this pseudocereal a nutritious and healthy source for the preparation of functional foods. The aim of this work was to assess the effect of the germination of quinua on the nutritional, biological and functional properties, in turn to be able to analyze the potential that this golden grain has in the food industry. For the systematic review, the databases (Scopus, Scielo and Science Direct) were used, following the PRISMA guideline and the PIO strategy (Population, Intervention, Outputs), which helped to formulate the search equations and to identify the most relevant articles of the last 5 years. The results of the bibliometric analysis showed that the germination of quinua improves the nutritional properties and the content...
13
artículo
Publicado 2017
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El objetivo del presente estudio fue evaluar la relación de la fibra detergente neutro/ proteína cruda sobre la excreción urinaria de derivados de purinas (DP) en alpacas. El diseño experimental fue un Cuadrado Latino 3x3. Se utilizaron tres alpacas Huacaya machos de 2.5 años de edad, confinados en corrales individuales. El alimento fue suministrado una vez al día y con agua ad libitum. Se trabajó con tres tratamientos a base de heno de avena, donde las relaciones de fibra/proteína se obtuvieron de acuerdo a las proporciones de tallos y hojas. Los tratamientos fueron: T1, hojas de heno de avena, 58.24% de fibra detergente neutro (FDN) y 6.8% proteína cruda (PC); T2, hojas y tallo de avena, 66.31% FDN y 6.36% PC; T3, tallos de avena, 70.22% FDN y 5.75% PC. Cada periodo experimental tuvo una duración de 14 días (10 de acostumbramiento y 4 de evaluación). Los niveles de DP en or...
14
artículo
Publicado 2020
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This study proposes an alternative biodegradable material for use with lettuce crops utilizing the bare-root hydroponic system, with the aim of functionally replacing expanded polystyrene, commonly used as a supporting material despite being a highly contaminating substance. This proposal is based on the production of individual pieces of floating material made from agro-industrial waste with an organic wax waterproof coating. The materials were produced in Quito, Ecuador, and the variables analyzed were hardness, compressive strength, flexural strength and microbiological contamination of the material during the vegetable growing period. Results showed that the alternative substrate with the greatest adaptability to the crops was made from a carnauba wax-coated palm fiber (Elaeis guineensis) blended with rice, in a ratio of 70%-30%, respectively.
15
artículo
Publicado 2020
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La presente investigación propone una alternativa de material biodegradable para uso en cultivos en medios hidropónicos de lechuga mediante el sistema de producción a raíz desnuda, con el objetivo de sustituir funcionalmente al poliestireno expandido, utilizado de manera habitual como material de soporte, a pesar de ser un elemento altamente contaminante. La propuesta tiene base en la elaboración de módulos individuales de material flotante a partir de desechos agroindustriales con un recubrimiento impermeabilizante de cera orgánica. Los materiales fueron elaborados en la ciudad de Quito, Ecuador, y las variables evaluadas fueron: dureza de superficies, resistencia a la compresión y a la flexión, y contaminación microbiológica del material durante el tiempo de cultivo del vegetal. Como resultado, se obtuvo que la propuesta con mayor adaptabilidad al cultivo fue la elaborada a ...
16
artículo
Publicado 2022
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Beer is one of the most consumed alcoholic beverages worldwide; however, with consumers more aware of food's environmental and nutritional benefits, there is a demand for more sustainable and value-added products. Andean pseudocereals (APS) are becoming a trend as gluten-free grains with excellent nutritional and nutraceutical value. Cultivated under the extreme climate conditions of the Peruvian Andes, APS seeds are an excellent source of starch, fiber, proteins, minerals, vitamins, and bioactive compounds such as phenolic acids and flavonoids with antioxidant capacity that provide potential health benefits. This review is a compilation of the information and studies on the general characteristics and potential of the main APS as quinoa, amaranth, and cañihua for beer production. In addition, current evidence of the malting process in APS and its effects on beer's nutritional, function...
17
tesis de grado
Publicado 2022
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The lacking of functional drinks of Amazonian fruits with health benefits was the reason for the elaboration of a functional drink based on Solanum sessiliflorum (cocona) with Stevia revaudiana (stevia) with the appropriate technological parameters and its respective file was proposed technique. The research was of a quantitative approach, of an experimental type, to carry out the project a totally randomized design was applied. Nine treatments were formulated, for which 3 equal volumes of cocona pulp of 500 ml each were made, 3 different amounts of water (500ml, 750ml, 1lt), and 3 different amounts of stevia (0.01%, 0.025%, 0.045%). The final formulation of the functional drink was sample C3 (dilution 1:1 with 0.045% stevia), with thermal treatment of 75 ° C by 5, presenting physicochemical values of acidity 1.18%, pH 3.81 and 3.27 ° Brix, nutritional minutes of proteins (0.46%), carb...
18
tesis de grado
Publicado 2019
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Se elaboró producto alimenticio liofilizado utilizando mezcla de jugos de maracuyá (Passiflora edulis) y camu camu (Myrciaria dubia), frutas tropicales de la amazonia, que aportan componentes bioactivos importantes para el cuerpo humano. Se formularon mezclas de maracuyá/camu camu (v/v: 50/50; 70/30 y 90/10) usando encapsulante 0,2% CMC y 1,5% Goma arábiga, se formaron cubos de 1,5 cm de espesor congelados a -24°C/24 horas y secados en un liofilizador a 0,2 y 165 Pa durante 24 horas. Se determinaron las propiedades fisicoquímicas del jugo y en polvo liofilizado, como color, polifenoles totales y vitamina C. Los resultados indican 15 °Brix, 74,61 mgAG/ml y 24,55 mgAA/ml (vitamina C) en jugo maracuyá; 6 °Brix, 622,88 mgAG/ml y 2714,10 mgAA/ml (vitamina C) en jugo camu camu, lo que confirma una ligera sinergia en la mezcla de jugos 50/50 y en polvo liofilizado con 0,2% CMC a una pr...
19
tesis de grado
Publicado 2025
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Abstract — In this project, a design for an automated mechanism is presented for implementation in textile manufacturing processes, where an integrated system for textile fiber recognition based on artificial intelligence (AI) was added. The mechanical design of the machine was studied in terms of force, providing a robust and efficient structure that supports the integration of sensors and cameras for real - time image capture of the processed fibers. Additionally, this design included a precise feeding system and a transport mechanism that ensured the stability and correct positioning of the fibers during analysis. In parallel, an AI model was implemented to identify and classify textile fibers based on their color characteristics. A simulated dataset was generated , where each type of fiber was represented by a specific color (red, green, blue, yellow), and a simple neural network w...
20
tesis de grado
Publicado 2025
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Se evaluó el efecto de la concentración de una bebida funcional a base de pulpa de mango (20, 17.5, 15 y 12.5%) y gel de aloe vera (5, 7.5, 10 y 12.5%) sobre la acidez titulable, viscosidad, contenido de fenoles, fibra cruda y aceptabilidad general en una bebida funcional. La prueba de Levene demostró homogeneidad de varianza para cada variable paramétrica y el análisis de varianza indico un efecto significativo (p < 0.05) de las variables independientes sobre la acidez titulable, viscosidad, contenido de fenoles y fibra cruda. Para el análisis sensorial se trabajó con 50 panelistas no entrenados, la prueba de Friedman demostró que hubo diferencia significativa (p < 0.05) y, por tanto, se realizó la prueba de Wilcoxon, demostrándose que existió efecto significativo entre cada uno de los tratamientos (p<0.05). Se determinó que el mejor tratamiento de esta investigación, por l...
