Numerical Calculations
Mostrando 1-12 de 156 artigos, teses e dissertações.
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1. A Nodal-iterative Technique for Criticality Calculations in Multigroup Neutron Diffusion Models
ABSTRACT In this work, a nodal and iterative technique to evaluate the effective multiplication factor as well as the neutron flux, in multigroup diffusion problems, is presented. An iterative scheme, similar to the source iteration method, is implemented to decouple the system of differential equations which is the fundamental mathematical model. Then, anal
Trends in Computational and Applied Mathematics. Publicado em: 2022
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2. An Alternative Description for the Electronegativity Difference in Binary Ionic Solids
We are introducing an alternative analytical expression to the electronegativity difference (∆χ) as a function of the charge ge, g is the charge factor, the fraction of the electronic charge devoted to the bond and e the elementary charge, the packing factor (p) and the effective atomic number (Zeff) of binary ionic solids, by using the very basic Coulomb
J. Braz. Chem. Soc.. Publicado em: 2021-02
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3. Numerical analysis of torsional tangent rigidity of reinforced concrete waffle slab
Resumo Este trabalho de investigação científica aborda a análise da rigidez tangente à torção de lajes nervuradas de concreto armado por meio de comparações da análise numérica com resultados de ensaios experimentais, cujo cálculo foi feito no programa ATENA. Tal programa foi desenvolvido especialmente para cálculo de estruturas de concreto arma
Rev. IBRACON Estrut. Mater.. Publicado em: 13/12/2019
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4. Propagation of vibrational modes in classical harmonic lattice with correlated disorder
Abstract: The vibrational modes with nonzero frequency are localized in harmonic lattice with disordered masses. In our work, we investigated numerically the propagation of vibrational energy in harmonic lattice with long-range correlated disordered masses, which are randomly distributed with power law spectrum S ( k ) ∝ k − α. For α = 0, a standar
An. Acad. Bras. Ciênc.. Publicado em: 01/07/2019
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5. Developing Flexibility in Mental Calculation
Resumo: A flexibilidade na realização de cálculos mentais tornou-se um foco importante para os educadores em matemática, com pesquisas surgindo nas últimas duas décadas. Resultados de pesquisas contemporâneas oferecem sólido suporte para o desenvolvimento da flexibilidade mental no ensino fundamental. Este estudo concentra-se em três temas inter-rel
Educ. Real.. Publicado em: 11/04/2019
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6. Reduction of epistemic uncertainty of a crash box model - experimental and numerical investigations
Abstract The high prediction accuracy of FEM calculations is an important prerequisite for their growing use in the field of crash load cases for vehicle body design. Although the simulation accuracy of crash calculations for steel structures already is at a high standard, continuous improvements and a further development of the simulation models are crucial
Lat. Am. j. solids struct.. Publicado em: 21/03/2019
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7. Numerical stress-life curves for the AISI 4340 steel using two sets of materials properties and different bi-axial stress ratios
Abstract Fatigue assessments by the more robust strain-based approach demand the determination of the local strain history from nominal stresses. For notched members, a cyclic constitutive relation, the stress concentration factor (SCF) and a strain concentration rule are used with this aim in some approximate solutions. The plastic part of the cyclic consti
Lat. Am. j. solids struct.. Publicado em: 29/10/2018
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8. Crashworthiness Performance of Stiffened Foam-filled Tapered Structures under Axial and Oblique Dynamic Loads
Abstract This paper aims to explore crashworthiness performance of new designed foam-filled tapered structures under axial and oblique impact load conditions. The structures consisted of inner and outer tapered tubes connected together by four stiffening plates. They also included square, hexagonal, octagonal, decagonal and circular cross-sectional shapes w
Lat. Am. j. solids struct.. Publicado em: 28/06/2018
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9. Procedimientos Aritméticos en la Resolución de Problemas de Fenómenos Variacionales
Abstract From the mathematical process of elaboration, comparison and practice of procedures, one of the five general mathematics processes according to MEN (1998), we presented in this document, the findings of a research which objective was to characterize some of the difficulties faced by students solving problems involving the variational phenomena. The
Bolema. Publicado em: 2018-04
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10. Theoretical Approach to Simulate Efficient Selective Solar Absorbers With Micro or Nano Structured Arrays
Study of the solar absorber with photonic crystal or micro structures as the heat absorbing surfaces operated at a high-temperature was conducted. Numerical calculations based on rigorous coupled-wave analysis were performed to determine the absorptance of the photonic crystal surface on the absorber. The effect of nano geometry of the photonic crystal in tu
Mat. Res.. Publicado em: 22/03/2018
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11. A Hybrid Approach for Assessments of Equivalent Emission Sources and Electromagnetic Environments
Abstract This paper presents a method for equivalent emission source determination by application of LLAs (Large Loop Antennas). A review of different types of LLAs is carried out and their characteristics regarding emission source evaluation are emphasized. A hybrid technic is applied for obtaining the electric fields based on previous measurement of magnet
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2018-03
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12. Analysis of Structural Crashworthiness and Estimating Safety Limit Accounting for Ship Collisions on Strait Territory
Abstract A series of analyses are carried out to predict the structural crashworthiness of a ship during a collision. The numerical configuration is verified by structural simulations based on a laboratory experiment wherein a penetration test is considered as the experimental reference. Comparative observations of structural behaviour are carefully conducte
Lat. Am. j. solids struct.. Publicado em: 2017-08