Electromagnetic Energy Density
Mostrando 1-12 de 16 artigos, teses e dissertações.
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1. Effect of PANI on Thermal, Mechanical and Electromagnetic Properties of HDPE/LLDPE/PANI Composites
In this work, polyaniline (PANI) in emeraldine-base form, synthesized by chemical oxidation polymerization, was protonated with hydrochloric acid (HCl). Composites based on high-density polyethylene (HDPE) and linear-low density polyethylene (LLDPE) blends with PANI were prepared in molten condition using a torque rheometer. The effect of compatibilizer agen
Mat. Res.. Publicado em: 11/12/2017
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2. Comparative analysis of different doses of coherent light (laser) and non-coherent light (light-emitting diode) on cellular necrosis and apoptosis: a study in vitro
Introduction Threshold doses of electromagnetic radiation can initiate necrosis and apoptosis in cells. The purpose of this study was to evaluate cellular apoptosis and necrosis immediately (t0) and 24 hours (t24) after irradiation with different doses of coherent light (laser) or non-coherent light (LED). Methods CHO-K1 lineage cells were irradiated with
Res. Biomed. Eng.. Publicado em: 2016-12
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3. A systematic sensitivity analysis of the performance of a transcutaneous energy transmitter for design purposes
This work studies a Transcutaneous Energy Transmitter (TET) which uses electromagnetic fields to transfer power from outside the body to an artificial organ in the body, working like a high frequency transformer with the skin being part of the magnetic coupling between the primary (external coil) and secondary (internal coil). For this reason, this project m
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2013-12
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4. DESENVOLVIMENTO DE OBJETOS SIMULADORES PARA MEDICINA NUCLEAR. / DEVELOPMENT OF PHANTOMS FOR NUCLEAR MEDICINE.
The phantoms used in Brazil are mostly imported and have relatively high financial cost. Although these phantoms can be considered as essentials for use in quality control, probably high quotas and import bureaucracy are obstacles to their acquisition by the nuclear medicine departments. The main objective of this work was the development of national phantom
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 14/11/2011
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5. Espalhamento de ondas eletromagnéticas por esferas e cilindros magnéticos: confinamento e transporte de ondas no limite de pequenas partículas e independência da energia armazenada com relação à forma do centro espalhador / Electromagnetic wave scattering by magnetic spheres and cylinders: waves confinement and transport in the small particle limit and independence of the stored energy with respect to the shape of the scatterer
O espalhamento eletromagnético por uma esfera com propriedades ópticas e raio arbitrários, conhecido como espalhamento de Lorenz-Mie, ou por um cilindro circular infinito, pode ser resolvido analiticamente e é comumente tratado dentro da abordagem de espalhadores dielétricos. Na região óptica, tanto meio circundante quanto partícula espalhadora possu
Publicado em: 2010
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6. Thermodynamic properties of the field electromagnetic field in the CPT-odd standard extended / Propriedades termodinâmicas do campo eletromagnético no setor CPT-ımpar do modelo padrão estendido
In this work we study the effects of the spontaneous breaking of Lorentz symmetry on black body radiation phenomenon in the context of the Maxwell-Caroll-Field-Jackiw (MCFJ) model. The MCFJ model is the electromagnetic CPT-odd sector of the standard model extension and, it presents for a purely space-like background a positive-definite hamiltonian. Firstly,
Publicado em: 2009
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7. Electrical system fault based on the resulting magnetic signature by Wavelet. / Análise da assinatura magnética resultante de faltas em sistemas elétricos via wavelets.
A methodology based on the analysis of magnetic fields for monitoring the quality of energy in electrical systems is presented herein. Aspects referring to fault detection in electrical systems in particular are evaluated. Contrary to the traditional monitoring process, in which sensors must be physically linked to the circuits under analysis, the results ar
Publicado em: 2009
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8. A influência dos parâmetros do vento solar na emissão de AKR durante tempestades magnéticas / The influence of the solar wind parameters on the AKR emission during magnetic storms
Several phenomena could be better studied and even disclosed after the development of the satellites and spacecrafts. Auroral Kilometric Radiation (AKR) is one of these phenomena. AKR was first detected only about thirty years ago; its typical frequencies are too low to penetrate earthward across the ionosphere. This radiation is generated through wave-parti
Publicado em: 2006
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9. Electromagnetic field in Lyra manifold: a first order approach
We discuss the coupling of the electromagnetic field with a curved and torsioned Lyra manifold using the Duffin-Kemmer-Petiau theory. We will show how to obtain the equations of motion and energy-momentum and spin density tensors by means of the Schwinger Variational Principle.
Brazilian Journal of Physics. Publicado em: 2005-12
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10. Supercondutividade nodal em metais de transição dicalcogenados
We investigate the macroscopic effects of charge density waves (CDW) and superconductivity in layered superconducting systems with broken lattice inversion symmetry (allowing for piezoelectricity) such as two dimensional (2D) transition metal dichalcogenides (TMD). We work with the low temperature time dependent Ginzburg-Landau theory and study the coupling
Publicado em: 2004
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11. Ressonancia parametrica em modelos de estrelas de neutrons
The Parametric Resonance phenomenon is nowadays the most accepted model to explain the huge production of matter in the pos-infiationary Universe. In this work we show that this phenomenon can also appears in models of neutron stars describing the production of photons in its interior. The Chapter 1 is a general introduction to the neutron stars. We describe
Publicado em: 2003
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12. ESTUDO DA FUSÃO E SOLIDIFICAÇÃO DA FASE BI-2212 E SEUS MECANISMOS DE SUPERCONDUÇÃO / STUDY OF BI-2212 PHASE MELTING AND SOLIDIFICATION AND ITS SUPERCONDUCTING MECHANISMS
High temperature superconductivity was discovered in 1986. Since then more than 150 new superconductors (cuprates, bismuthates, borides and fullerite) with critical temperature higher then 23,3K (the highest critical temperature for low temperature superconductors) have been synthesized. Many of them rise interest from the scientific viewpoint and are suitab
Publicado em: 2003