Tópicos Sugeridos dentro de su búsqueda.
Tópicos Sugeridos dentro de su búsqueda.
Buscar alternativas:
composite based » composites based (Expander búsqueda), composito basado (Expander búsqueda), nanocomposite based (Expander búsqueda)
practice » practices (Expander búsqueda), practica (Expander búsqueda)
composite based » composites based (Expander búsqueda), composito basado (Expander búsqueda), nanocomposite based (Expander búsqueda)
practice » practices (Expander búsqueda), practica (Expander búsqueda)
1
tesis de maestría
A combined experimental/analytical approach for an efficient evaluation of stiffness and characteristic curves of fiber reinforced plastic volute springs is presented in this work. Before performing the analysis mentioned in previous lines, in the early chapters, it can find the most common types of fibers, resins (matrices) and manufacturing processes used to produce composite laminates been briefly described. It also describes the analytical approaches that currently exist to determine the elastic constants of composites such as the longitudinal and transversal modulus, Poisson’s ratios and shear moduli; it also describes the improved and semi-empirical formulas to calculate the effective shear moduli and the transversal modulus. At the end of the chapter, some manufacturing methods of fiber reinforced plastic springs are described. Since fiber reinforced plastic volute springs are n...
2
tesis de maestría
A combined experimental/analytical approach for an efficient evaluation of stiffness and characteristic curves of fiber reinforced plastic volute springs is presented in this work. Before performing the analysis mentioned in previous lines, in the early chapters, it can find the most common types of fibers, resins (matrices) and manufacturing processes used to produce composite laminates been briefly described. It also describes the analytical approaches that currently exist to determine the elastic constants of composites such as the longitudinal and transversal modulus, Poisson’s ratios and shear moduli; it also describes the improved and semi-empirical formulas to calculate the effective shear moduli and the transversal modulus. At the end of the chapter, some manufacturing methods of fiber reinforced plastic springs are described. Since fiber reinforced plastic volute springs are n...
3
artículo
Publicado 2017
Enlace
Enlace
Purpose. This paper aims to examine the valuation precision of composite models in each of six key industries in South Africa. The objective is to ascertain whether equity-based composite multiples models produce more accurate equity valuations than optimal equity-based, single-factor multiples models. Design/methodology/approach. This study applied principal component regression and various mathematical optimisation methods to test the valuation precision of equity-based composite multiples models vis-à-vis equity-based, single-factor multiples models. Findings. The findings confirmed that equity-based composite multiples models consistently produced valuations that were substantially more accurate than those of single-factor multiples models for the period between 2001 and 2010. The research results indicated that composite models produced up to 67 per cent more accurate valuations th...
4
artículo
Publicado 2017
Enlace
Enlace
Purpose – This paper aims to examine the valuation precision of composite models in each of six key industries in South Africa. The objective is to ascertain whether equity-based composite multiples models produce more accurate equity valuations than optimal equity-based single-factor multiples models. Design/methodology/approach – This study applied principal component regression and various mathematical optimisation methods to test the valuation precision of equity-based composite multiplesmodels vis-à-vis equity-based single-factor multiples models. Findings – The findings confirmed that equity-based composite multiples models consistently produced valuations that were substantially more accurate than those of single-factor multiples models for the periodbetween 2001 and 2010. The research results indicated that composite models produced up to 67 per cent more accurate valuatio...
5
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.
6
artículo
Publicado 2023
Enlace
Enlace
The evolution of direct restorative materials for posterior dental pieces has led to the generation of simpler processes that are easier for the clinician to perform. This is how bulk fill composite resins arise, in order to simplify the technique and provide the clinician with speed and practicality when performing the restoration. Although it is true that these materials have been used, there is still a lot of ignorance on the side of the professional about how to use them correctly. In addition to certain limitations in published research since they are relatively new materials on the market. This research aims to review the literature in indexed databases to date on bulk fill resins, detailing clinical trials, composition and classification.
7
tesis de maestría
Publicado 2012
Enlace
Enlace
Owing their wide range of exceptional properties, for example thermal conductivity values of more than 3000W/(mK) and strength in the range of 100 GPa, Carbon Nanotubes (CNTs) have recently gained much attention as reinforcement for composite materials. Considering the practical application in metal matrix composites (MMCs), tranferring those favourable properties from nano to macro scale represents a main challenge. Methods of the powder metallurgy route show promising results so far, but also lead to long process times and damage of the tublar structure of the CNTs due to prolonged ball milling times. At this point, the application of Friction Stir Processing (FSP) for fabricating CNT-reinforced MMCs offers the possibility to reduce process times and realize the required reinforcement at the relevant location of the component. The process uses a specially designed tool with a pin to pl...
8
tesis de maestría
Publicado 2012
Enlace
Enlace
Owing their wide range of exceptional properties, for example thermal conductivity values of more than 3000W/(mK) and strength in the range of 100 GPa, Carbon Nanotubes (CNTs) have recently gained much attention as reinforcement for composite materials. Considering the practical application in metal matrix composites (MMCs), tranferring those favourable properties from nano to macro scale represents a main challenge. Methods of the powder metallurgy route show promising results so far, but also lead to long process times and damage of the tublar structure of the CNTs due to prolonged ball milling times. At this point, the application of Friction Stir Processing (FSP) for fabricating CNT-reinforced MMCs offers the possibility to reduce process times and realize the required reinforcement at the relevant location of the component. The process uses a specially designed tool with a pin to pl...
9
artículo
Publicado 2023
Enlace
Enlace
Este trabajo propone reflexiones sobre el proceso de creación de videoescenas, un concepto de Danza, Teatro y Tecnología, desarrollado por Andraus (2021). De la experiencia observacional, tanto de caminar por la ciudad de Aurangabad, India, como de la participación en el grupo de bailarines Odissi durante la pasantía doctoral en Artes Escénicas, en la Universidad MGM, a lo largo del primer semestre de 2023, surge la cartografía acústica. Describo así este proceso compositivo, tomando como referencia los conceptos de paisaje sonoro de Schafer (1991; 1997), investigación sonora de Feld (2018), acústica de Seeger (2015), camino estético de Careri (2017), así como de la técnica y teoría de la danza y musicalidad Odissi, lenguaje que constituye mi principal técnica de interpretación y entrenamiento. El simbolismo abstracto presente en la cartografía mencionada trajo nuevas po...
10
artículo
Publicado 2022
Enlace
Enlace
The brain-gut-microbiota axis is a bidirectional complex that connects the central nervous system with the digestive system. Alterations in the composition of the intestinal microbiota have been linked to the presence of digestive and extradigestive diseases such as neuropsychiatric diseases. Dysbiosis predisposes to the appearance of alterations in intestinal permeability, which facilitates the release of neurotransmitters and cytokines that generate favorable conditions for the appearance of a state known as neuroinflammation, which seems to be key in the physiopathogenesis of neuropsychiatric diseases. Based on these data, the modulation of the microbiota through changes in diet, antibiotics and probiotics could be a useful alternative, not only for the treatment of digestive diseases but also extra-digestive disorders such as neuropsychiatric diseases.
11
artículo
Publicado 2017
Enlace
Enlace
Software Process Improvement (SPI) models are a very important topic for SPI workers as software engineering students that require a good comprehension of the process assessment models. This paper proposes a visual multi-layered representational model describing in a highly practical way the ISO/IEC 33000 Assessment Framework through of structural and behavioural views. This kind of representation comprises several semantic layers based on the dimensions of the key elements of the model with an additional dimension for specifying measurements. The structural elements of the model are assigned on distinct layers and connected through dependence and co-occurrence connector in applying the Assessment Model on software processes. The representation model was tested with software developers, academic experts and students.
12
artículo
Publicado 2024
Enlace
Enlace
We tend to see objectification as a negative act in clinical practice, yet Svenaeus makes us reflect that it has in fact allowed for a better understanding of the functioning and composition of the body. In this article, from his epistemological proposal, we will address the good and the bad forms of objectification in the nutritional practice of adolescents with large bodies by using visualization technologies, specifically electrical bioimpedance. Finally, from a hermeneutics and phenomenology standpoint, we propose that in nutritional practice, in addition to treating the biological body, we also treat the lived body of adolescents, based on listening to and understanding their being/existence in the world.
13
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.
14
artículo
Publicado 2026
Enlace
Enlace
Livestock production in the high Andes is vital for rural livelihoods and food security but is limited by poor pasture quality, environmental variability, and restricted resources. Pasture improvement, achieved through management practices and particularly through fertilization, may enhance productivity and sustainability in high-Andean livestock systems. This study aimed to characterize mixed herds composed of domestic sheep (Ovis aries), alpacas (Vicugna pacos), llamas (Lama glama), and domestic cattle (Bos taurus) and to evaluate the role of pasture fertilization on herd composition and livestock size. Primary data were collected through structured questionnaires administered to 88 randomly selected livestock producers, complemented by direct field observations of grazing areas, corrals, shelters, and water sources. The survey documented herd structure, grazing management, pasture con...
15
tesis de grado
Publicado 2024
Enlace
Enlace
La presente investigación tuvo como objetivo determinar el efecto de la temperatura y tiempo de horneado en la aceptabilidad general de una galleta elaborada a base de tarwi (Lupinus mutabilis). La elaboración de la galleta con tarwi (Lupinus mutabilis) se realizó de la siguiente forma: recepción, dosificado, mezclado y amasado, extendido, moldeado, horneado, enfriado y envasado. Se utilizó un Diseño Compuesto Central Rotable (DCCR) con dos variables independientes, haciendo un total de cuatro puntos factoriales, incluido cuatro puntos axiales y tres repeticiones en el punto central, totalizando 11 ensayos. Las variables evaluadas fueron: temperatura de horneado (de 130 a 160°C) y tiempo de horneado (de 10 a 16 minutos) como variables independientes; y la aceptabilidad general de la galleta como variable dependiente. La evaluación de aceptabilidad se realizó con un total de 60 p...
16
tesis de grado
Publicado 2025
Enlace
Enlace
El presente estudio tuvo como objetivo determinar si existen diferencias en el grado de microfiltración marginal en restauraciones directas de cavidades Clase IV y V utilizando la técnica convencional con resina compuesta Filtek™ Z350 XT frente a la agregación de un sellador de superficie (FORTIFY). Se utilizó un enfoque cuantitativo, con diseño aplicado, experimental, analítico y de corte transversal, basado en mediciones numéricas y análisis estadístico inferencial. La muestra estuvo conformada por 40 piezas dentales humanas extraídas por motivos ortodónticos, divididas en cuatro grupos de 10: dos con restauraciones convencionales y dos con aplicación del sellador, mediante un muestreo no probabilístico por conveniencia. Los resultados mostraron que la aplicación del sellador redujo significativamente la microfiltración marginal en comparación con la técnica convenci...
17
Publicado 2019
Enlace
Enlace
El objetivo de este trabajo de investigación recoger las bases teóricas y práctica para comprender la relación de los aspectos geométricos y algebraicos. La monografía está dividida en tres partes: En la parte I, se presenta, los aspectos preliminares donde se precisan y diferencian los conceptos de ley de composición interna y ley de composición externa, luego se presentan los axiomas que definen la estructura de grupo y de cuerpo que son importantes para el estudio de los espacios vectoriales. Con base en estos conceptos, en la parte II, se explican los conceptos de espacios vectoriales, subespacios vectoriales, combinaciones lineales, espacios generados, dependencia e independencia lineal, base y dimensión de los espacios vectoriales; así como también en la parte III, se presentan las transformaciones lineales. Para ayudar en la comprensión de los conceptos, se incluyen e...
18
Publicado 2020
Enlace
Enlace
El objetivo de este trabajo de investgaciòn es dar a conocer que el lenguaje musical, abarcaría toda esa sintaxis y estructura oracional que nos permitiría trasmitir a través de la interpretación melódica, en este sentido el LM ofrece una visión más global y completa, pasando de la escolarización vocal a la formación auditiva, pasando por la articulación corporal, entendiendo esto. tema vital para la ejecución melódica y que se convierte en la base de una extensa instrucción melódica. Podemos decir que, como razón, el LM fomentará los límites vocales, cadenciados, psicomotores, auditivos y expresivos, a través de la información y práctica de los signos que lo estructuran y los estándares o pautas que lo rigen, permitiéndole ser decodificado y percibido aquí y allá. estructurar los mensajes melódicos. Por lo general, en las disciplinas de evaluación útiles, que...
19
artículo
Publicado 2025
Enlace
Enlace
Grassland ecosystems cover about 25% of the Earth’s surface, providing essential ecosystem services that benefit nature, people, and food security. This study evaluated agronomic and nutritional parameters of ryegrass (Lolium multiflorum Lam.) based on fertilization levels and cutting frequency in the Amazonas department. The INIA 910—Kumymarca variety was used with nitrogen fertilization rates (0, 60, 120, 180 kg/ha) and cutting intervals of 30 and 45 days for agronomic traits and 30, 45, and 60 days for nutritional traits. A randomized complete block design with eight treatments and three replications was applied. Repeated measures analysis and Tukey’s mean comparison tests (p < 0.005) were performed, along with Pearson correlation and response surface analysis using the central composite design in R. The results showed that applying 180 kg/ha of nitrogen with a 45-day cutting in...
20
artículo
Publicado 2021
Enlace
Enlace
The present instrumental study aimed to describe the psychometric properties of the Coping with Pre-Exam Anxiety and Uncertainty Scale (COPEAU-A) in Chilean university students. 230 first-year students from a university in the north of Chile participated, where 67,4% were women and 32.6% men, with an average age of 18,9 years. By confirmatory factor analysis, using a robust weighted least squares method (WLSMV), five models were compared, finding the best fit indicators in the composite of four oblique factors with 20 ítems (X2=228,795, gl=164, p<,01; X2/gl=1,395; TLI=,929; CFI=,939; RMSEA=,042). The reliability of the four factors was adequate, showing McDonald's Omega coefficients between ω=,716 and ω=,873. In turn, the results showed the factorial invariance of the instrument according to sex. It is concluded that the psychometric properties of COPEAU-A would support its use to ...
