Electron Self Energy
Mostrando 1-12 de 33 artigos, teses e dissertações.
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1. Synthesis, characterization and microwave dielectric properties of flower - like Co(OH)2/C nanocomposites
Flower - like Co(OH)2/C nanocomposites have been synthesized by a facile hydrothermal method. Flower - like Co(OH)2/C nanocomposites were self - assembled by the nanosheets with the thickness distribution of 50 - 80 nm and abundant flocculent carbon structures. With the help of transmission electron microscopy and energy dispersive spectrometer, nanosheets w
Mat. Res.. Publicado em: 22/07/2014
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2. Analysis and PIC simulation of a Gyrotron travelling wave tube amplifier
The analysis of a Ka-band gyrotron Travelling Wave Tube (gyro-TWT) amplifier using a uniform cylindrical waveguide as its interaction circuit has been presented for the TE01 mode of operation a self-consistent nonlinear analysis in the large signal regime. The analysis predicts that the saturated peak output power of ~ 134 kW with a power conversion efficien
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2013-12
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3. Desenvolvimento de estruturas do tipo bi-camada baseadas em camadas auto-organizadas e polianilina para a proteção contra a corrosão de ligas de alumínio / Development of structures such as bi-layer based on self-assembled monolayers and polyaniline for corrosion protection of aluminum alloys
A method widely used in corrosion protection of aluminum alloys is the formation of conversion layers of chromium. In search of "environmentally friendly" corrosion protection methods there is the possibility of using conducting polymers such as polyaniline (PAni), which can act by barrier effect or absorbing charged particles from the solution and / or self
Publicado em: 2010
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4. Caracterização de cinza obtida por combustão de casca de arroz em reator de leito fluidizado
The rice husk combustion in a bubbling and atmospheric fluidized bed reactor was investigated. This paper presents the rice husk ash characterization employing the techniques of X-ray diffraction (XRD), X-ray fluorescence (XRF), and scanning electron microscopy (SEM) among others. After combustion, a rice husk ash containing 93% amorphous silica and <3% unbu
Química Nova. Publicado em: 2009
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5. Investigação da Difusão de Portadores em Pontos Quânticos Sob Campo Elétrico Externo Por Meio da Varredura da Microluminescência
In this work, we present the study of energy transfer processes between self-assembled quantum dots (QDs) of InAs in GaAs layers within an intrinsic region of a p-i-n device. These p-i-n structures are assembled with electrical contacts providing the application of an electrical potential. The three samples used have diferent layer spacing and barrier size b
Publicado em: 2009
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6. Microscopical study of nanometric particles adhesion / Estudo microscopico de adesão de particulas nanometricas
The adhesion of nanometric phases is a topic of increasing scientific interest due to its importance for the production and properties of new nanostructured materials. This study explores the following hypothesis: immiscible and wettable particles carrying charges with same signal can adhere provided that they are mixed in aqueous dispersion and dried out. T
Publicado em: 2009
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7. Estudo da desativação do agente VX usando o MgO por cálculos ab initio
The organophosphates are used in industry, in the fields of dyes, varnishes, artificial leather, electrical insulation, waterproofing, plastics, oil additives and solvents, are also used in medicine to treat diseases such as glaucoma, in the household and in agriculture are applied as insecticides and pesticides. Besides these various civilian facilities, th
Publicado em: 2009
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8. APLICAÇÃO DE MOLÉCULAS AUTO-ORGANIZÁVEIS (SAM) EM FILMES FINOS DE SnO2 / APPLICATION OF SELF ASSEMBLED MOLECULES (SAM) IN THIN FILMS SnO2
Thin films of tin dioxide (SnO2) with the addition of doping are widely used because its various applications, so develop a search on this subject is of great value technology, since many different forms of doping, formulation and preparation, can be made and modified, intended to improve this material according to their physical and chemical properties. Thi
Publicado em: 2008
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9. Laser production of highly charged ions
A summary of ion generation experiments at both low (10(9) W=cm²) and high (10(16) W=cm²) laser intensities, using Nd:YAG and iodine lasers, as well as the properties of the ions produced, are presented. Different medium- and high-Z elements were tested as a target: Ag, Al, Au, Co, Cu, Nb, Ni, Pb, Pt, Sn, Ta, W. A maximum charge state 55+ and maximum energ
Brazilian Journal of Physics. Publicado em: 2004-12
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10. Two dimensional computer simulation of plasma immersion ion implantation
The biggest advantage of plasma immersion ion implantation (PIII) is the capability of treating objects with irregular geometry without complex manipulation of the target holder. The effectiveness of this approach relies on the uniformity of the incident ion dose. Unfortunately, perfect dose uniformity is usually difficult to achieve when treating samples of
Brazilian Journal of Physics. Publicado em: 2004-12
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11. Vibrational structure of organic semiconductors: the role of conjugation length
Site-selective luminescence spectroscopy (SSL) was employed to resolve the vibracional modes in self-assembled poly(p-phenylene vinylene), PPV. Using Franck-Condon analysis, the PPV spectra can be well described by three effective vibrational modes at 330, 1160 and 1550 cm-1. As the temperature increases from 4 to 180 K the electron-phonon coupling (S factor
Brazilian Journal of Physics. Publicado em: 2004-06
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12. Modelos Efetivos para o Elétron / Effective Models for the Electron
We present two models for the electron in classical electrodynamics, which include some effects from quantum electrodynamics. In the first model, the electron is treated as an extended particle owing to the high-frequency oscillations (Zitterbewegung) of its electrical charge. We show that this model predicts correctly the magnitude of the electron spin and
Publicado em: 2003