Tópicos Sugeridos dentro de su búsqueda.
Tópicos Sugeridos dentro de su búsqueda.
Buscar alternativas:
composite form » composite from (Expander búsqueda), composite para (Expander búsqueda), composito formado (Expander búsqueda)
form function » forma funcion (Expander búsqueda), body function (Expander búsqueda), forest functions (Expander búsqueda)
composite form » composite from (Expander búsqueda), composite para (Expander búsqueda), composito formado (Expander búsqueda)
form function » forma funcion (Expander búsqueda), body function (Expander búsqueda), forest functions (Expander búsqueda)
1
artículo
Publicado 2019
Enlace
Enlace
This paper presents a static analysis of laminated composite doubly-curved shells using refined kinematic models with polynomial and non-polynomial functions recently introduced in the literature. To be specific, Maclaurin, trigonometric, exponential and zig-zag functions are employed. The employed refined models are based on the equivalent single layer theories. A simply supported shell is subjected to different mechanical loads, specifically: bi-sinusoidal, uniform, patch, hydrostatic pressure and point load. The governing equations are derived from the Principle of Virtual displacement and solved via Navier-Type closed form solutions. The results are compared with results from Layer-wise solutions and different higher order shear deformation theories available. It is shown that refined models with non-polynomial terms are able to accurately predict the through-the-thickness displaceme...
2
artículo
Publicado 2019
Enlace
Enlace
This study presents a static analysis of laminated composite doubly curved shells using a refined kinematic model with polynomial and non-polynomial functions. In particular Maclaurin, trigonometric, exponential and zig-zag functions are employed. Refined models are based on the Equivalent Single Layer theories and obtained by using Carrera Unified formulation. The shell model is subjected to different mechanical loading such as bi-sinusoidal, uniform and point load. The governing equations are derived from the principle of virtual displacement and solved via Navier-Type closed form solutions. The results are compared with Layer-wise and higher-order shear deformation solutions available in the literature. It is shown that refined models with non-polynomial terms are capable of accurately predicting the through-the-thickness displacements and stress distributions with a low computational...
3
artículo
Publicado 2016
Enlace
Enlace
This paper presents a static analysis of functionally graded single and sandwich beams by using an efficient 7DOFs quasi-3D hybrid type theory. The governing equations are derived by employing the principle of virtual works in a weak form and solved by means of the Finite Element Method (FEM). A C1 cubic Hermite interpolation is used for the vertical deflection variables while C0 linear interpolation is employed for the other kinematics variables. Convergence rates are studied in order to validate the finite element technique. Numerical results of the present formulation are compared with analytical and FEM solutions available in the literature.
4
artículo
Publicado 2021
Enlace
Enlace
The author(s) disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: J.C.-V. thanks to Circulo de Investigacion e Innovacion de Materiales Avanzados para la Industria y Biomedicina of FONDECYT (CONCYTEC) under grant No 011-2014-FONDECYT, and to the Brazilian Society of Physics (PLAF program) that financed part of this work. C. V.L., J.Q.-M. and V.P.R. are grateful to FONDECYT (CONCYTEC) for financial support through the Excellence Center Program.
5
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.
6
artículo
Publicado 2024
Enlace
Enlace
Commercial tara protein (CTP) and sacha inchi oil are promising Peruvian products for forming food emulsions. The present work aimed (1) to characterize the functional properties of CTP as a new protein source (water and oil absorption, foam, and gelling capacity) and (2) to deepen the CTP to form sacha inchi oil emulsions. The CTP (2%, 4%, 6%) and oil concentration (15%, 20% and 25%) were evaluated for rotor-stator (RS) emulsion production. Final emulsions (RS-US) were produced with RS emulsions added with 2% tara gum and ultrasound homogenization at 75% power amplitude for 3 min. Emulsions were analyzed according to gravitational stability, droplet size, and optical microscopy. The results showed that the CTP presented a centesimal composition of 6.03% moisture, 45.16% proteins, 12.32% lipids, 2.49% fiber, 6.04% ashes, and 27.96% carbohydrates. CTP had a greater oil absorption (2.1442 ...
7
artículo
Publicado 2015
Enlace
Enlace
The closed-form solution of a generalized hybrid type quasi-3D higher order shear deformation theory (HSDT) for the bending analysis of functionally graded shells is presented. From the generalized quasi-3D HSDT (which involves the shear strain functions “f(ζ)” and “g(ζ)” and therefore their parameters to be selected “m” and “n”, respectively), infinite six unknowns' hybrid shear deformation theories with thickness stretching effect included, can be derived and solved in a closed-from. The generalized governing equations are also “m” and “n” parameter dependent. Navier-type closed-form solution is obtained for functionally graded shells subjected to transverse load for simply supported boundary conditions. Numerical results of new optimized hybrid type quasi-3D HSDTs are compared with the first order shear deformation theory (FSDT), and other quasi-3D HSDTs. The...
8
artículo
The restoration of a root canal treated tooth with change of color represents a challenge in the current dentistry, since in some cases it is not enough to perform only one procedure that is the appropriate one in our opinion, but it is possible to consider choosing a set of them to obtain satisfactory results. It is not sufficient to know the forms of the dental pieces if these are not homogenized with the other ones in all their aspects; consequently, the color gains vital importance to perform a good restoration procedure. By applying procedures such as internal and external whitening, as well as composite resins, suitable results can be obtained giving back the patient the aesthetics and function lost. In this article, some basic criteria are detailed to be taken into account in the resolution of a case of dyschromia combining whitening and composite resins procedures; the results ob...
9
artículo
The restoration of a root canal treated tooth with change of color represents a challenge in the current dentistry, since in some cases it is not enough to perform only one procedure that is the appropriate one in our opinion, but it is possible to consider choosing a set of them to obtain satisfactory results. It is not sufficient to know the forms of the dental pieces if these are not homogenized with the other ones in all their aspects; consequently, the color gains vital importance to perform a good restoration procedure. By applying procedures such as internal and external whitening, as well as composite resins, suitable results can be obtained giving back the patient the aesthetics and function lost. In this article, some basic criteria are detailed to be taken into account in the resolution of a case of dyschromia combining whitening and composite resins procedures; the results ob...
10
artículo
Publicado 2020
Enlace
Enlace
This paper presents Best Theory Diagrams (BTDs) constructed from non-polynomial terms to identify best shell theories for bending analysis of cross-ply single skin and sandwich shell panels. This structure presents a constant radii of curvature. The shell theories are constructed using Axiomatic/Asymptotic Method (AAM). The different shell theories are described using the Carrera's Unified Formulation. The governing equations are derived from the Principle of Virtual Displacement (PVD). Navier-Type closed form solution is used for solving the bending problem of simply supported doubly curved shell panels subjected to bi-sinusoidal transverse pressure. The BTDs built from non-polynomial functions are compared with Maclaurin expansions. Spherical shell panels with different layer-configurations are investigated. The results demonstrated that the shell models obtained from the BTD using non...
11
tesis de grado
Publicado 2024
Enlace
Enlace
El objetivo del presente estudio fue evaluar la contracción de las resinas compuestas expuestas a la luz operatoria. Se seleccionaron 03 marcas de resinas nano híbridas: PALFIQUE LX5 (Tokuyama Dental), Enamel plus HRi Bio Function (Micerium) y Filtek TM Z350 XT (3M). Se realizó la distribución de las muestras de las resinas previamente dispensadas en un modelador de discos para luego ser llevadas a una lámina porta objetos y superpuesta con una lámina cubre objetos, inmediatamente se colocó encima un bloque de acero de 2.5kg durante 05 segundos para que la resina se extienda y así poder medir con un calibrador electrónico el diámetro del halo formado con su extensión. Las medidas se tomaron en tres tiempos: 0 segundos, 60 segundos y 120 segundos de exposición. Hubo contracción en las 03 marcas de resinas expuestas a la luz operatoria a los 60 y a los 120 segundos, siendo las...
12
artículo
Publicado 2019
Enlace
Enlace
This research was funded by FONDECYT–CONCYTEC (grant contract number 274-2015-FONDECYT).
13
artículo
Publicado 2021
Enlace
Enlace
A quasi-three-dimensional solution for the bending analysis of simply supported orthotropic piezoelectric shallow shell panels subjected to thermal, mechanical and electrical potential is introduced. The mechanical governing equations are derived in term of three-dimensional equilibrium relations and the classical Maxwell's equations. The trough-the-thickness temperature is modeled by the Fourier's heat conduction equation. The coupled partial differential equations are solved by Navier closed form solutions. The trough-the-thickness profile for electrical potential, temperature profile and displacements is obtained by using a quasi-exact method so-called the differential quadrature method (DQM). Chebyshev polynomials of the third kind are used as the basis functions and the grid thickness domain discretization for the DQM. The interlaminar conditions for transverse stresses, temperature...
14
tesis de maestría
Publicado 2023
Enlace
Enlace
El objetivo de esta investigación fue estudiar la relación entre las funciones ejecutivas, el estrés académico y el rendimiento académico en el programa de Diploma del Bachillerato Internacional. La muestra estuvo conformada por 76 estudiantes de cuatro instituciones educativas privadas de Lima Metropolitana (M = 16.2 años DE = .46 años). Con el objetivo de analizar la relación entre las variables de estudio se aplicó el cuestionario de autorreporte Behavior Rating Inventory of Executive Function (Brief 2) para medir las funciones ejecutivas y el Cuestionario de Estrés Académico en la Educación Secundaria (QASSE) para medir el estrés académico de los estudiantes. En cuanto al rendimiento se utilizó la nota obtenida por los estudiantes en el Programa de Diploma en la sesión de noviembre 2019. Los resultados mostraron que existía una relación negativa pequeña entre la es...
15
tesis de grado
Publicado 2011
Enlace
Enlace
In this paper we study the influence of Arabic gum in tassel textile fibers, cotton, denim and linen to form a composite material. These materials were carbonized to obtain carbon fibers. The textile fiber tassel is study mainly for it presents a structure that collapses at temperatures below 275 ° C. It studies influence of Arabic gum as adhesive and anthracite as a reinforcing on composite material. The carbonized material quality is function of their tensile strength. The investigation variables are: ratio of arabic gum (adhesive) / water, anthracite as reinforcement and carbonization temperature. The results show that arabic gum prevents that fiber structure tassel collapse on carbonization. Anthracite under certain conditions increases the tensile strength. But temperature is a function of anthracite as reinforcement. The highest tensile strength is obtained for the initial composi...
16
tesis de grado
El diseño estructural en sección compuesta ha tomado gran importancia a nivel ingenieril, gracias a las ventajas de usar diferentes materiales para crear un elemento con propiedades mejoradas. En relación a este gran avance, el campo de diseño se ha visto en la obligación de crear normas o reglamentos que tomen en cuenta el correcto funcionamiento de dicho sistema. Por ello, el diseño se debe regir en principios o filosofías que brinden la seguridad; uno de los principales principios es el estado límite de servicio, cuyo principio es asegurar el correcto desempeño estructural tanto la funcionabilidad como la seguridad. A través de los años, el comportamiento, en dicho estado, es asumido en rango elástico, ya que se diseña con la suposición de que los elementos trabajan elásticamente y en consecuencia sus respuestas estructurales también. Por tal motivo, las respuestas est...
17
artículo
Publicado 2023
Enlace
Enlace
Purpose: The theoretical debate of corruption's impact on economic growth remains unsettled, making it an empirical question. This study aims to investigate corruption's effect on BRICS countries' economic growth. Design/methodology/approach: A panel dataset on BRICS countries spanning 1996 to 2020 was used. Bias-corrected estimators in small dynamic panels were employed to estimate a growth model as a linear-quadratic function of corruption that accounts for cross-sectional dependence, endogeneity and unobserved heterogeneity due to country and time-specific characteristics. Findings: The results indicate that corruption is detrimental to economic growth in BRICS countries; the quadratic relationship implies corruption is less prevalent in some countries than others. Thus, governments of BRICS countries are encouraged to embark on anti-corruption policies to boost their economic perform...
18
Publicado 2018
Enlace
Enlace
El objetivo de este trabajo de investigación es dar a conocer que en el diseño arquitectónico, se consideran tanto las formas geométricas planas como el cuadrado, el círculo y el triángulo, como los volúmenes tridimensionales creados por ellas, como el cubo, el prisma, la esfera, la pirámide y el cono, cuando se analiza la relación entre función y forma. El arquitecto logra crear una composición que conformará la estructura exterior de la edificación mediante la combinación de estas formas tridimensionales y el uso de operaciones de adición o sustracción, o ambas. La configuración arquitectónica ha sido constante desde épocas ancestrales, y cada cultura ha desarrollado su propia identidad arquitectónica, con similitudes o diferencias con otras culturas. Posteriormente, surgió el Funcionalismo como una tendencia arquitectónica. En su origen se encuentra la raíz de e...
19
tesis de maestría
Publicado 2023
Enlace
Enlace
El objetivo de esta investigación fue estudiar la relación entre las funciones ejecutivas, el estrés académico y el rendimiento académico en el programa de Diploma del Bachillerato Internacional. La muestra estuvo conformada por 76 estudiantes de cuatro instituciones educativas privadas de Lima Metropolitana (M = 16.2 años DE = .46 años). Con el objetivo de analizar la relación entre las variables de estudio se aplicó el cuestionario de autorreporte Behavior Rating Inventory of Executive Function (Brief 2) para medir las funciones ejecutivas y el Cuestionario de Estrés Académico en la Educación Secundaria (QASSE) para medir el estrés académico de los estudiantes. En cuanto al rendimiento se utilizó la nota obtenida por los estudiantes en el Programa de Diploma en la sesión de noviembre 2019. Los resultados mostraron que existía una relación negativa pequeña entre la es...
20
artículo
This paper presents a static analysis of functionally graded (FG) single and sandwich beams by using a simple and efficient 4-unknown quasi-3D hybrid type theory, which includes both shear deformation and thickness stretching effects. The governing equations and boundary conditions are derived by employing the principle of virtual works. Navier-type closed-form solution is obtained for several beams. New hybrid type shear strain shape functions for the inplane and transverse displacement were introduced in general manner to model the displacement field of beams. Numerical results of the present compact quasi-3D theory are compared with other quasi-3D higher order shear deformation theories (HSDTs).
