Peak Bragg
Mostrando 1-12 de 14 artigos, teses e dissertações.
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1. Case study of muscle fatigue in parafunctional patient using occlusal device with fiber Bragg grating sensors
Abstract This case study describes a new method using a fiber optic Bragg grating sensor to determine muscle fatigue in a patient wearing a resilient occlusal device for the treatment of bruxism symptoms. Four tasks performed at maximum bite force induced rapid exhaustion for the analysis of fatigue. The results show that it is possible to obtain a better un
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2018-06
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2. Hyperbranched polyester polyol plasticized tapioca starch/low density polyethylene blends
Abstract In this work, low density polyethylene (LDPE)/plasticized starch (TPS) blends were prepared. The TPS employed in this study was obtained by plasticization of tapioca starch with a hyperbranched polyester polyol. Differential scanning calorimetry analysis showed that the melting temperature increased with the TPS content. The opposite effect was exhi
Polímeros. Publicado em: 2017-03
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3. Performance analysis of peak tracking techniques for fiber Bragg grating interrogation systems
In this paper, we propose a spectral correlation-based technique for tracking the wavelength shift of a fiber Bragg grating. We compared this approach, by means of a Monte Carlo numerical simulation, to the typical peak tracking techniques applied in classic interrogation systems. As result, we obtained a considerable gain in terms of noise tolerance (about
J. Microw. Optoelectron. Electromagn. Appl.. Publicado em: 2012-12
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4. Estudo estrutural de nanossistemas semicondudores e semicondutores implantados por difração de raios-X de n-feixes / Structural study of semiconductors nanosystems and implanted semiconductors by means of n-beams X-ray diffraction
In this paper, X-ray multiple diffraction (MD) associated with the advantages of synchrotron radiation appears as a high-resolution microprobe and it is used to obtain relevant contributions to the study of structural properties of semiconductor materials, as they present themselves nanosystems epitaxial or implanted with ions. The study and detection of neg
Publicado em: 2010
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5. Medida de uma curva contínua do poder de freamento de partículas alfa em Al na região do pico de Bragg / Mensure of the stopping power continuous curve for alpha particles in Al foils around the Bragg peak energy
We present in this work experimental energy loss curves for alpha particles in Al foils around the Bragg peak energy. Our method is based on an integration of the energy spectrum, combining elastic scattering in thick targets with transmission method, providing an almost continuous energy loss curve with $2-3\%$ precision. To achieve this precision we perfor
Publicado em: 2008
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6. AvaliaÃÃo das forÃas ortodÃnticas utilizando sensores de fibra Ãtica
Fibre Bragg gratings and polymer optical fibre sensors we used to investigate orthodontic forces. These sensors offer advantages for their use due to the reduced dimensions, chemical inertness, dielectric structure, high sensitivity and compatibility. The measured signal is the wavelength position of the peak in the optical reflection spectra of the Bragg se
Publicado em: 2008
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7. Mesure of a continuos curve of stopping power for alpha particles in Al around region of Broogs peak / Aplicação do GEANT4 no estudo da influência da rugosidade da superfície de ânodos de tubos de raios X utilizados em radiologia diagnóstica
Estudos recentes utilizaram filtração com absorvedores de W para representar o efeito da rugosidade do ânodo. Para verificar a validade desta metodologia, neste trabalho, foram avaliados espectros de energia na faixa utilizada em radiologia diagnóstica convencional (40, 80 e 150 kV), gerados por tubos de raios X com ânodos rugosos por meio de simulaçõ
Publicado em: 2008
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8. Estruturas de barreira dupla de PbTe/PbEuTe crescidas por epitaxia de feixe molecular / PbTe/PbEuTe double barrier structures grown by molecular beam epitaxy
This work reports the growth of PbTe/Pb(1-x)Eu(x)Te double barrier (DB) structures by molecular beam epitaxial and the device processing aiming the resonant tunneling measurement. The samples were grown on (111) BaF(2) substrates at 300°C. Resistivity and Hall effect measurements were performed on reference films to determine the most suitable electrical pr
Publicado em: 2006
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9. Primary radicals production from water fragmentation by heavy ions
The importance of fragmentation of water molecules by heavy ions is discussed for several different physical environments, including tumor treatment, planetary sciences and fission reactors. The characteristics of the fragmentation yields by electrons, protons and photons are presented and compared with fragmentation yields of water molecules by C3+ and O5+
Brazilian Journal of Physics. Publicado em: 2005-12
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10. Estudo de efeitos coerentes e geraÃÃo de luz com momento angular orbital vua mistura de ondas em Ãtomos de cÃsio frios
We have investigated phase-conjugate four-wave mixing (FWM) processes in magneto-optically cooled cesium atoms. We studied the generation of a coherent beam of light carrying orbital angular momentum, nondegenerate four-wave-mixing process in a Zeeman degenerate three-level system and a spontaneous coherence grating transfer mechanism. In the generation of b
Publicado em: 2005
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11. Difração multipla de raios-X no estudo de ordenamento em ligas semicondutoras e defeitos em semicondutores implantados
The aim of this work is to develop the X-ray multiple diffraction, as a new technique to characterize semiconductors wafers submitted to ion implantation and, epitaxial layers that presents atomic ordering. The technique was also of great usefulness in the study of the heterostucture lattice coherence. The sensitivity of the Bragg-surface diffraction (BSD) c
Publicado em: 1999
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12. Estudo de monocromadores assimetricos de raios-X
Asymmetric X-ray monochromators, firsts introduced by I. Fankuchen ( 1937 ) with the purpose of concentrating an X-ray beam have been the subject of numerous investigations. Evans, Hirsch and Kellar as early as 1948, based ther well known and hitherto unchallenged study on the hypothetic existence of a non-ref1ecting surface layer with an absorption coeffici
Publicado em: 1979