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Otimização dos parâmetros de monopolos planares de microfita para aplicações em sistemas de banda ultra larga
(Universidade Federal do Rio Grande do NorteBRUFRNPrograma de Pós-Graduação em Engenharia ElétricaAutomação e Sistemas; Engenharia de Computação; Telecomunicações, 2008-10-21)
This work presents a theoretical and experimental investigation about the properties of microstrip antennas for ultra-wideband systems. Configurations of elliptic monopoles with different eccentricities and circular monopoles ...
Analytical study of the swing-by maneuver in an elliptical system
(2018-02-01)
The objective of the present paper is to derive a set of analytical equations that describe a swing-by maneuver realized in a system of primaries that are in elliptical orbits. The goal is to calculate the variations of ...
Focal mechanism, magnitude, and finite-fault rapid estimation using the elliptical patch method in Chile
(Seismological Soc Amer, 2018)
Nowadays, most fast, automatic algorithms estimate the magnitude and location of earthquakes assuming a point-source approximation that might produce large errors in the predicted shaking. In this study, using a kinematic ...
Analytical study of the powered Swing-By maneuver for elliptical systems and analysis of its efficiency
(2018-07-01)
Analytical equations describing the velocity and energy variation of a spacecraft in a Powered Swing-By maneuver in an elliptic system are presented. The spacecraft motion is limited to the orbital plane of the primaries. ...
Influence of old rectangular repair patches on the burst pressure of a gas pipeline
(Elsevier, 2006-01-04)
Seven full scale hydrostatic burst tests were carried out on pipes extracted from an API 5LX52 gas pipeline that contained rectangular and elliptical fillet welded patches and other repairs of different geometries. All ...
Synthesis Methodology Applied to a Tunable Patch Filter With Independent Frequency and Bandwidth Control
(IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INCPISCATAWAY, 2012)
A new methodology for the synthesis of tunable patch filters is presented. The methodology helps the designer to perform a theoretical analysis of the filter through a coupling matrix that includes the effect of the tuning ...
Consistent and stable meshfree Galerkin methods using the virtual element decomposition
(Wiley, 2017)
Over the past two decades, meshfree methods have undergone significant development as a numerical tool
to solve partial differential equations (PDEs). In contrast to finite elements, the basis functions in meshfree
methods ...
Alternative transfer to the Earth-Moon Lagrangian points L4 and L5 using lunar gravity assist
(Elsevier B.V., 2014-02-01)
Lagrangian points L4 and L5 lie at 60 degrees ahead of and behind the Moon in its orbit with respect to the Earth. Each one of them is a third point of an equilateral triangle with the base of the line defined by those two ...
Dipole evolution in rotating two-dimensional flow with bottom friction
(2012)
The evolution of a dipolar vortex in a quasi-two-dimensional rotating flow of barotropic fluid over a flat surface with a no-slip condition in the Ekman bottom layer is considered. The vorticity equation in this case becomes ...
Interpolación de cónicas en 3D, usando cuboides Interpolation of conics in 3D, using cuboids
(Ciencia e Ingeniería, 2022)