Tópicos Sugeridos dentro de su búsqueda.
Tópicos Sugeridos dentro de su búsqueda.
Buscar alternativas:
composites con » compositos con (Expander búsqueda), componentes con (Expander búsqueda), composites _ (Expander búsqueda)
con function » con funcion (Expander búsqueda), cost function (Expander búsqueda), convex function (Expander búsqueda)
composites con » compositos con (Expander búsqueda), componentes con (Expander búsqueda), composites _ (Expander búsqueda)
con function » con funcion (Expander búsqueda), cost function (Expander búsqueda), convex function (Expander búsqueda)
1
artículo
Publicado 2009
Enlace
Enlace
Los problemas en el sector anterior son muy comunes en nuestra práctica profesional y cobra vital importancia el realizar una adecuada rehabilitación en estos casos; no podemos hacer una buena rehabilitación si no conocemos las características básicas tanto estéticas como funcionales. Hoy las resinas compuestas son una alternativa válida para la reconstrucción del sector anterior, ya que nos brindan una buena posibilidad conservadora y estética, pero independientemente del material a utilizar debemos basarnos en ciertas reglas o parámetros para realizar una adecuada rehabilitación. En el presente artículo se detallan los criterios básicos a tomar en cuenta para reconstruir el sector anterior así como la técnica al utilizar resinas compuestas.
2
artículo
Publicado 2009
Enlace
Enlace
The anterior sector problems are very common in our professional practice and became vital importance to make a suitable rehabilitation in these cases; we can not do a good rehabilitation if we do not know the basic characteristics, both aesthetic and functional. Today the composites are a valid alternative for the restoration of the anterior sector, since they offer to us a conservative and aesthetic possibility, but independently of the material to use we have to based on certain rules or parameters to realize a suitable rehabilitation. In this article the basic criteria to keep in mind are detailed to restore the anterior sector as well as the skills on having used composites.
3
objeto de conferencia
Publicado 2020
Enlace
Enlace
ABSTRACT This work evaluated the influence of the concentration of NaOH (100, 200 and 300 g/L NaOH) in the mercerization process at 25 °C for 1 h, and of the percentage (15, 20 and 25% m/m) of Mauritia flexuosa fibers on impact resistance in a polyester matrix composite. The polyester matrix composite was obtained by the compression molding process, at a constant pressure of 24 MPa. The obtained plates had a dimension of 130 mm long x 80 mm wide x 3.4 mm thick. Specimens for the impact assay were extracted from the obtained plates under the EN ISO 179-1 standard. Likewise, the fiber-reinforced composites without treatment were also evaluated, all the fibers were characterized before and after the NaOH treatment by means of the chemical characterization of the fiber, absorption percentage, scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy ( FT-IR). The result...
4
artículo
Publicado 2012
Enlace
Enlace
The aim of the present work was to optimize the sensorial and technological features of ice cream. The experimental work was performed in two stages: 1) optimization of lactose enzymatic hydrolysis, and 2) optimization of the process and product. For the first stage a complete factorial design was developed, optimized using both response surface and the steepest ascent method. In the second stage a mixture design was performed, combining the process variables. The product with the best sensorial acceptance, high yield and low cost was selected. The acceptance of the product was developed by an untrained taster’s panel. As a main result the sensorial and technological features of the final product were improved, establishing the optimum parameters for its elaboration.
5
artículo
Publicado 2012
Enlace
Enlace
The aim of the present work was to optimize the sensorial and technological features of ice cream. The experimental work was performed in two stages: 1) optimization of lactose enzymatic hydrolysis, and 2) optimization of the process and product. For the first stage a complete factorial design was developed, optimized using both response surface and the steepest ascent method. In the second stage a mixture design was performed, combining the process variables. The product with the best sensorial acceptance, high yield and low cost was selected. The acceptance of the product was developed by an untrained taster’s panel. As a main result the sensorial and technological features of the final product were improved, establishing the optimum parameters for its elaboration.
6
artículo
Tooth wear is the loss of hard tissue of multiple aetiology and may be due to functional or parafunctional factors. Depending on this, a restorative treatment should be chosen based on the severity of the wear, as it can result in loss of vertical dimension of occlusion (VOD), tooth sensitivity, and decreased quality of life. In these cases, the choice of restoration strategy must follow evidence-based treatment protocols, which include direct and indirect restoration techniques, as well as minimally invasive treatments based on composite resins that emerge as an alternative to conventional restorations of ceramics. This clinical case describes the treatment of a patient with severe dental wear through oral rehabilitation with composite resins through direct and indirect techniques, with the aim of preserving the tooth structure as much as possible and having greater aesthetic-functional...
7
artículo
Publicado 2021
Enlace
Enlace
El deterioro de las construcciones hechas con ignimbrita en el centro histórico de Arequipa, es un problema causado por el intemperismo, emisión de contaminantes industriales y biológicos, afectando su preservación. Se evaluó aplicar a la ignimbrita, polisiloxano funcionalizado con nanopartículas de plata (PXS-AgNPs), como recubrimiento para disminuir su porosidad, evitar su degradación y darle un efecto protector a su superficie.Las nanopartículas de plata (AgNPs) se sintetizaron, por reducción de nitrato de plata (AgNO3) con borohidruro de sodio (NaBH4), el polisiloxano se sintetizó por hidrólisis del clorosilano en agua y éter dietílico; que fue funcionalizado con AgNPs, mezclando soluciones acuosas de PXS y de AgNPs, obteniéndose un gel de color amarillo lechoso. Se aplicó PXSAgNPs a la superficie de la ignimbrita y se realizaron pruebas de adsorción con solución de ...
8
artículo
Publicado 2017
Enlace
Enlace
The alterations of the lipid metabolism and the uncertainty at the moment of selecting beneficial foods to the human body lead to the investigation of omega fatty acids. The study is based on the evaluation of the effect of three preparation methods of chía seed, before getting the oil through two extraction methods and the characterization of the lipid fraction of chia seed (Salvia hispánica L.) from Colta-Ecuador. The oil yield of the conditioned seeds showed statistical differences. Regarding the extraction method, the differences were highly significant, the use of ether in the Soxhlet equipment showed the superiority in the oil performance in a relation of approximately 2:1 versus immersion in hexane. The presence and the content of fatty acids was determined by the use of a gas chromatograph with FiD detector Agilent Technologies 5975C brand, fatty acids were separated with a cap...
9
artículo
Publicado 2023
Enlace
Enlace
In recent years, the consumption of beverages has increased; however, the excessive consumption of processed and packaged foods with a high sugar content is detrimental to human health as it has led to an increase in various metabolic diseases, which is why it is essential to introduce into the food chain new options of beverages enriched with fruit pulp, rich in polyphenolic compounds and antioxidants. This research sought to develop a functional beverage based on soybean juice and aguaymanto pulp sweetened with stevia, for which nine treatments were formulated consisting of 70, 80 and 90% soybean juice, 30, 20 and 10% aguaymanto pulp and 0.08, 0.10 and 0.12% stevia, and their physicochemical characteristics, sensory acceptability and bioactive composition were evaluated. The results showed that treatment 3 presented the highest sensory acceptability by the panelists with a score of 3.3...
10
artículo
Publicado 2025
Enlace
Enlace
The main campus of the National University of San Marcos (UNMSM), located in Lima, Peru, has green areas that function as refuges for a significant diversity of birds. The aim of this research was to determine the species composition of the avifauna present on the main campus of the National University of San Marcos, Lima, Peru. Observations were carried out between August 2024 and July 2025, during the morning and afternoon hours. Thirty-three species were recorded, distributed across 10 orders and 18 families, with the Passeriformes order and the Thraupidae family predominating. The most representative trophic guilds were granivores and insectivores equally (27.3%), which is consistent with patterns typically observed in urban environments. Furthermore, the adaptation of Chordeiles acutipennis (Hermann, 1783) to archaeological sites on campus was documented, highlighting the importance...
11
artículo
Publicado 2025
Enlace
Enlace
Bulk-fill composite resins have emerged as a key innovation in restorative dentistry, offering an efficient and modern alternative for direct dental restorations. These resins allow for the placement of thicker layers, reducing clinical time. Among their main features are their adaptability, adequate depth of polymerization, and mechanical properties, which meet clinical requirements for functional and durable restorations. The clinical benefits of bulk-fill resins include reduced polymerization shrinkage stress and simplified handling, making them particularly useful for deep cavity restorations. However, despite these advantages, controversies have arisen regarding their long-term performance, such as color stability and wear resistance in areas of high occlusal load. This article reviews the fundamental characteristics of bulk-fill resins, their clinical benefits, and the controversie...
12
tesis de grado
Antecedentes: Los cambios de estilo de vida y la mayor valoración de una dieta saludable ha permitido el desarrollo de alimentos y bebidas funcionales. Estas bebidas funcionales, sean naturales o artificiales, contienen sustancias benéficas para la salud o potencian algún aspecto de esta. Además, se consumen con cierta frecuencia y presentan pigmentos relacionados a sus componentes. No existe información sobre el efecto que puede producir sobre restauraciones de composite. Objetivo: Evaluar la influencia de bebidas funcionales en el color de un composite de nanorelleno. Materiales y Métodos: Se confeccionaron 60 especímenes de composites (Filtek™ Z350 XT, 3M ESPE, St. Paul, EEUU) color A2 (7 mm diámetro x 2 mm altura). Los especímenes fueron inmersos en las bebidas (Vitaenergía, ON, No Stress, Amalaki, café y agua destilada) por 30 minutos durante 28 días. El registro del c...
13
artículo
Publicado 2017
Enlace
Enlace
The competence of the European States in the field of international relations seems to conceive at the present time as an all-embracing faculty, which embraces all responsibility for any activity with external significance. In the Spanish case, this trend has meant a return to the prevailing conception during the primary stage of constitutional development, and refers to coverage in an expansive reading of the State’s competency title on international relations and on the functions of international treaties and Direction Foreign policy constitutionally conferred on the Government.
14
artículo
Publicado 2023
Enlace
Enlace
The aim of this study was to evaluate the effect of the genotype on the deposition curve of the chemical components and fatty acid profile of carcass of guinea pigs of Peru and Cieneguilla genotypes. Forty-eight male guinea pigs (24 per genotype), randomly distributed in pens with three animals each per genotype were used. Management and feeding protocols, up to 32 wk of age, were similar for both genotypes. The deposition curve of the chemical components was determined using the Gompertz equation. Data of the fatty acid profile were submitted to analysis of varianza under a Randomized Complete Block Design using the SAS Studio Environment software, with a significance level of α = 0.05. The results showed that the asymptote of the moisture and protein content in the carcass of the Peru genotype was higher (P < 0.05) than that of Cieneguilla genotype, but not in the fat content, whic...
15
artículo
Publicado 2019
Enlace
Enlace
The effects of organic and conventional crop systems on chemical composition, antioxidant activity and functional properties were evaluated in white and dark chia (Salvia hispanica L.) seeds. The organic system reduced the total protein content, and increased the total carbohydrates but did not change polyunsaturated fatty acids, total phenolic or flavonoids. Organic white chia seeds showed the best techno-functional properties. The antioxidant capacity of chia extracts varied in relation to the chemical complexity and differential rate kinetics of different assays. Extractable total phenolic acids and antioxidant capacity were better in organic white chia seeds. In this first approach, we have demonstrated that the organic white chia seed has a better total antioxidant capacity measured by direct quencher approaches than its conventionally-grown counterpart. To summarize, we conclude th...
16
artículo
Publicado 2024
Enlace
Enlace
The valorization and use of lignocellulosic biomass from food processing to obtain value-added products is crucial to improve sustainability and reduce waste management costs. This potential for cost reduction is a reason for optimism, as it allows agro-industrial waste to be transformed into valuable resources, contributing to the circular economy. This study focused on the compositional and structural characterization of eleven types of lignocellulosic biomass (LCB) to evaluate their potential in producing nanopolysaccharides and polyhydroxyalkanoates. Parameters such as humidity, ash, proteins, extractives, structural carbohydrates, and lignin were analyzed in passion fruit peels, artichoke bracts, asparagus peels, lemon peels, orange peels, avocado seed, potato peels, cassava peels, sugar cane bagasse, rice husk, and rice straw. The results showed that fruit peels and other waste had...
17
artículo
Publicado 2025
Enlace
Enlace
This study analyzes the potential of 12 seeds from the Peruvian region as by-products of fruit processing, presenting them as a sustainable alternative for waste reduction and the valorization of bioactive compounds. It highlights their chemical composition and the role they can play in recovering bioactive compounds with antioxidant, antimicrobial, and functional properties. The study explores the possibility of utilizing fruit by-products in various industrial sectors, such as food, pharmaceutical, and nutraceutical industries, thereby contributing to the circular economy and a more sustainable management of natural resources. The review emphasizes the importance of addressing challenges such as the presence of antinutrients and contaminants, as well as evaluating processing methods that can reduce these compounds, highlighting the need to ensure their safety for consumption and their ...
18
artículo
Publicado 2013
Enlace
Enlace
Nowadays we possess diverse materials to realize posterior direct restorations as the seventh-generation adhesives and the nanotechnology resins systems. As well as the materials are changing in the time the same happens with the techniques and protocols to use. In the present article there is detailed the protocol of application of seventh-generation adhesives as agent of link and the application of a composite resin using the oblique incremental technique in cavities with and without glass ionomer in the resolution of a clinical case. Results: The obtained results were satisfactory for the patient since it was possible to restore adequately the dental piece involved returning the aesthetics and the lost function. Conclusions: The deep knowledge of the materials to be used as well as the techniques it is going to lead to optimizing of our rehabilitation treatment.
19
artículo
Publicado 2013
Enlace
Enlace
Nowadays we possess diverse materials to realize posterior direct restorations as the seventh-generation adhesives and the nanotechnology resins systems. As well as the materials are changing in the time the same happens with the techniques and protocols to use. In the present article there is detailed the protocol of application of seventh-generation adhesives as agent of link and the application of a composite resin using the oblique incremental technique in cavities with and without glass ionomer in the resolution of a clinical case. Results: The obtained results were satisfactory for the patient since it was possible to restore adequately the dental piece involved returning the aesthetics and the lost function. Conclusions: The deep knowledge of the materials to be used as well as the techniques it is going to lead to optimizing of our rehabilitation treatment.
20
tesis de maestría
Publicado 2025
Enlace
Enlace
Artículo sustentado el 02 de diciembre 2025 para la obtención del grado académico de Maestro en Ciencias de la Ingeniería.
