Computation Of Lines
Mostrando 1-12 de 16 artigos, teses e dissertações.
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1. Meshless Methods for Computation of Overhead Transmission Lines Electromagnetic Fields
Abstract The meshless element-free Galerkin method (EFGM) is used to solve partial differential equations responsible for obtaining the electromagnetic fields generated by a transmission line. For this purpose, a 2D model based in a real transmission line is constructed and simulated. The results obtained by EFGM have good accuracy and they are compared agai
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2021-06
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2. Cálculo das retas numa superfície cúbica em P3
In this work we study cubic surfaces in P3. More specically, we take care to count the number of lines on these surfaces. In chapter one we proved that the number of lines on a non-singular cubic surface in P3 is 27. In chapter two, as the motivation for chapter three, we focused in the classifcation of singularities of plane curves. For the singular case, d
Publicado em: 2011
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3. An arbitrary lagrangian-eulerian method for surface-tension dominated flows with contact lines / Simulação numérica de escoamentos bidimensionais com superfícies livres e linhas de contato dinâmicas
An arbitrary lagrangian-eulerian finite element method to solve surface tension dominated flows is presented. Such flows are important in many applications, particularly in capillary channels, that appear in microscale flows. The resolution of such flows presents several challenges that are addressed in this work. The flow is solved only in the liquid phase,
Publicado em: 2010
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4. MÉTODOS ESTATÍSTICOS APLICADOS AO CÁLCULO DA AMPACIDADE E RISCO TÉRMICO DE LINHAS AÉREAS DE TRANSMISSÃO / STATISTICAL METHODS APPLIED TO AMPACITY AND THERMAL RISK CALCULATION OF OVERHEAD TRANSMISSION LINES
This work presents a new proposition for calculation of statistical ampacity and thermal risks associated to ampacity values by using simulation methods that employ intensive computation. The proposed approach uses Bootstrap and Monte Carlo simulation methods in order to calculate and infer information of statistical ampacity drawn from meteorological variab
Publicado em: 2008
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5. On the divergence of line search methods
We discuss the convergence of line search methods for minimization. We explain how Newton's method and the BFGS method can fail even if the restrictions of the objective function to the search lines are strictly convex functions, the level sets of the objective functions are compact, the line searches are exact and the Wolfe conditions are satisfied. This ex
Computational & Applied Mathematics. Publicado em: 2007
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6. Fatores geneticos moduladores da gravidade clinica nas Beta-talassemias : o exemplo da proteina AHSP (Alpha Hemoglobin Stabilizing Protein)
Alpha-hemoglobin stabilizing protein (AHSP) is an erythroid-specific molecular chaperone that binds the cx-chains of hemoglobin, preventing their precipitation and deleterious effects. Loss of AHSP exacerbates a-globin precipitation and anemia in a murine model for p-thalassemia. In vitro, recombinant AHSP inhibits the production of reactive oxygen species (
Publicado em: 2006
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7. MOORING PATTERN OPTIMIZATION USING GENETIC ALGORITHMS / OTIMIZAÇÃO DA DISPOSIÇÃO DE LINHAS DE ANCORAGEM UTILIZANDO ALGORITMOS GENÉTICOS
With the increasing demand for oil, oil companies have been forced to exploit new fields in deep waters. Due to the high cost of oil exploitation operations, the development of technologies capable of increasing efficiency and reducing costs is crucial. In this context, the use of floating units in deep waters has become more frequent. The positioning of the
Publicado em: 2005
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8. TRAÇADO AUTOMÁTICO DE ENVOLTÓRIAS DE ESFORÇOS EM ESTRUTURAS PLANAS UTILIZANDO UM ALGORITMO EVOLUCIONÁRIO / AUTOMATIC TRACING OF ENVELOPES IN PLANAR STRUCTURES USING A EVOLUTIONARY ALGORITHM
The objective of this work is to develop a tool for obtaining envelopes of internal forces due to load-trains in the FTOOL software. Usually, envelopes are obtained through interpolation of limiting values on pre- selected sections along the structure. These values are obtained based on the positioning of the loadtrain in relation to influence lines of inter
Publicado em: 2005
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9. LabSis : um ambiente para desenvovimento de aplicações sismicas Matlab
The Matlab package is a tool of widespread use in the academic environment, because of its advantages in simple direct programming, graphs and visualization tools. It allows initial implementations of algorithms and procedures very quickly in a series of applications. As a counterpar to the above good qualities, Matlab programs do not exhibit the computation
Publicado em: 2004
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10. Analise numerica e experimental de fluxo de energia em estruturas
This work deals with the theoretical, numerical and experimental aspects of energy flow in structures. The mathematical formulation for computation of power flow maps is presented for beams (Euler-Bernoulli and Timoshenko) and plates (Kirchhoff and Mindlin) The physical meaning of active and reactive power is discussed. The reactive intensity is related with
Publicado em: 2001
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11. Calculos de curtos-circuitos para estudo e analises da proteção de sistemas eletricos
This work describes the implementation of a software for short circuit calculations. Its objective is to facilitate the analysis and studies of electric systems protection. The main characteristics of the program consists: System pre fault state determination including shunt elements in the short circuit computation; parallel transmission lines mutual coupli
Publicado em: 1998
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12. HANDWRITING RECOGNITION / RECONHECIMENTO DE CARACTERES MANUSCRITOS
This work introduces an image processing methodology that, associated with a multi-level neural network of perceptrons, is able to isolate and recognize cursive handwritten characters. The character isolation technique makes use of fundamental geometric and topological aspectos of the characters. The work describe procedures to extract the characters skeleto
Publicado em: 1995