Drift Velocity
Mostrando 13-24 de 35 artigos, teses e dissertações.
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13. Estudos da deriva zonal e dinâmica das bolhas de plasma na região tropical / Zonal drifts and dynamical study of the plasma bubbles over the tropical region
All-sky airglow OI 630 nm images obtained at Cachoeira Paulista in the period from January 1989 to December 1991 and January 1995 to December 1997 are analysed to study the nocturnal and seasonal dynamic behavior, as well as bifurcation variations of plasma bubbles during high and low solar activity. Also, all-sky images from São João do Cariri and Cachoei
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 19/02/2002
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14. Electron mobility in nitride materials
We contribute here a theoretical study of the electron mobility in n-doped GaN, InN, and AlN at moderate to high electric fields. We solve the set of coupled nonlinear integro-differential equations of evolution to obtain the steady-state values of the basic intensive nonequilibrium thermodynamic variables for the three materials. The regions with ohmic and
Brazilian Journal of Physics. Publicado em: 2002-06
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15. Estudos da deriva zonal e dinâmica das bolhas de plasma na região tropical / Zonal drifts and dynamical study of the plasma bubbles over the tropical region
All-sky airglow OI 630 nm images obtained at Cachoeira Paulista in the period from January 1989 to December 1991 and January 1995 to December 1997 are analysed to study the nocturnal and seasonal dynamic behavior, as well as bifurcation variations of plasma bubbles during high and low solar activity. Also, all-sky images from São João do Cariri and Cachoei
Publicado em: 2002
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16. Desenvolvimento de um navegador autônomo, usando GPS, aplicado ao controle autônomo de órbita. / Autonomous orbit navigator development, using GPS, applied to autonomous orbit control.
The appearance of modern global positioning systems motivated the study and development of precise and robust systems for autonomous orbit determination of artificial satellites. These systems maintain, independently from human intervention from the ground, a precise knowledge of the satellite orbital state, through the processing of the information, autonom
Publicado em: 2001
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17. Estudo das derivas zonais das irregularidades de plasma ionosférico na região brasileira / Study of ionospheric zonal plasma irregularity drifts over brazilian region
A detailed study of the zonal drift velocities of the ionospheric bubbles is carried out using experimental airglow data registered at Cachoeira Paulista (22.50 S, 450 W, dip 300 S)during the period of October to March, between 1980-1994. This study is based upon 172 nights of zonal scanning photometer measurements of OI 630 nm airglow. The zonal velocity ma
Publicado em: 2000
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18. Ordem e caos em plasmas magnetizados
The objective of this thesis is to present a clear understanding of some important nonlinear phenomena that are common in space and laboratory plasmas. Specifically,the present analytical and numerical studies have focused on the properties of electromagnetic turbulence as well as associated coherent structures and chaotic behaviors in a multi-component magn
Publicado em: 1999
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19. Estudos de derivas ionosfericas por meio de ionosondas digitais / Ionospheric drift studies by digital ionosondes
The ionospheric plasma drifts over the Brazilian region were studied using data from the digital ionosondes DGS256, at São Luís (MA) (2,3°S; 42°W) and CADI (Canadian Advanced Digital Ionosonde), at Fortaleza (CE) (4°S; 38°W), both instruments located at equatorial region. In order to validate the use of those instruments to measure ionospheric plasma d
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 199809
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20. Estudos de derivas ionosfericas por meio de ionosondas digitais / Ionospheric drift studies by digital ionosondes
The ionospheric plasma drifts over the Brazilian region were studied using data from the digital ionosondes DGS256, at São Luís (MA) (2,3°S; 42°W) and CADI (Canadian Advanced Digital Ionosonde), at Fortaleza (CE) (4°S; 38°W), both instruments located at equatorial region. In order to validate the use of those instruments to measure ionospheric plasma d
Publicado em: 1998
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21. Propriedades estruturais e eletricas dos carvões minerais brasileiros
Inspection of X-ray diffraction patterns revealed that the amorphous structure of Brazilian natural coals evolue towards a more ordered state after heat treatment at high temperatures. The structure of samples carbonized in vacuum above 2000 ºC is similar to that of commercial graphite. The microscopic particles with graphitic structure which characterized
Publicado em: 1980
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22. Increased drift in amblyopic eyes.
Reports are conflicting on the presence of increased drift in amblyopic eyes. Furthermore, the individual effects of either amblyopia or strabismus alone on ocular drift have not been systematically investigated. We therefore used a photoelectric method to record horizontal eye position during monocular and binocular fixation in patients having amblyopia wit
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23. Drift and diffusion in periodic potentials: Upstream and downstream step times are distributed identically
This note deals with particles diffusing in one dimension in the presence of a periodic potential and a uniform driving force. We show that (i) the probabilities for the particle to make a step of the length L, where L is the period, in the upstream and downstream directions are independent of the periodic potential, and (ii) the distributions of the step ti
American Institute of Physics.
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24. Random walk theory of a trap-controlled hopping transport process
A random walk theory of hopping motion in the presence of a periodic distribution of traps is presented. The solution of the continuous-time random walk equations is exact and valid for arbitrary intersite interactions and trap concentration. The treatment is shown to be equivalent to an exact solution of the master equation for this trapping problem. These