Traveling Wave
Mostrando 1-12 de 30 artigos, teses e dissertações.
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1. Sustentação de corrente utilizando campos magnéticos viajantes helicoidais / Helical traveling wave current drive
Entre os diferentes métodos alternativos à indução, para sustentação e/ou geração de corrente em plasmas confinados magneticamente, com o objetivo de se obter o funcionamento contínuo de um possível reator de fusão, foi estudado aquele associado a campos magnéticos viajantes produzidos por bobinas helicoidais alimentadas por correntes de radiofre
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/02/2012
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2. New approach for tanh and extended-tanh methods with applications on Hirota-Satsuma equations
In this work, we establish new exact solutions for the Hirota-Satsuma equations. New approach for the tanh is used and extended tanh methods to construct traveling wave solutions in terms of a hyperbolic tangent functions. New families of solitary wave solutions and periodic solutions are also obtained for Hirota-Satsuma equations. Our approach is reduce the
Computational & Applied Mathematics. Publicado em: 2009
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3. LINEAR ULTRASONIC MOTOR WITH TUBULAR GEOMETRY / MOTOR ULTRA-SÔNICO LINEAR COM GEOMETRIA TUBULAR
This work presents the study on a linear ultrasonic motor with tubular geometry for linear displacements. Similar topologies, reported elsewhere, are conceived for producing rotary motions. Due to some particular characteristics of this geometry, not explored yet, a new study on interaction between resonance modes in a hollow cylinder for linear movement gen
Publicado em: 2008
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4. BK equation and traveling wave solutions
It has been shown that the transition to the saturation regime of high energy QCD is similar to the formation of the front of a traveling wave. In particular, it can be verified that Balitsky-Kovchegov (BK) evolution equation reduces, after some approximations, to the nonlinear Fisher and Kolmogorov-Petrovsky-Piscounov (FKPP) equation, well-known from statis
Brazilian Journal of Physics. Publicado em: 2007-07
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5. "Investigação do processo de obtenção de aluminatos de bário e cálcio para construção e caracterização de catodos termiônicos impregnados para aplicação em dispositivos de microondas de potência" / INVESTIGATION OF BARIUM-CALCIUM ALUMINATE PROCESS TO MANUFACTURE AND CHARACTERIZE IMPREGNATED THERMIONIC CATHODE FOR POWER MICROWAVE DEVICES
O presente trabalho descreve os processos de preparação do aluminato de bário e cálcio, material emissor de elétrons, empregados nos catodos do tipo impregnado para utilização em uma válvula de microondas do tipo TWT. Os catodos investigados constituem-se de uma pastilha de tungstênio porosa impregnada com aluminato de bário e cálcio com proporç�
Publicado em: 2006
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6. Considerations on undistorted-progressive X-waves and Davydov solitons, Fröhlich-Bose-Einstein condensation, and Cherenkov-like effect in biosystems
Research in ultrasonography has evidenced the propagation of a peculiar kind of excitation in fluids. Such excitation, dubbed a X-wave, has characteristics resembling that of a solitary-wave type. We reconsider the problem in a medium consisting of a biological material of the like of alpha-helix proteins. It can be shown that in this case is expected an exc
Brazilian Journal of Physics. Publicado em: 2004-06
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7. Images of evolution: origin of spontaneous RNA replication waves.
Self-replicating molecules set up traveling concentration waves that propagate in an aqueous enzyme solution. The velocity of each wave provides an accurate (+/- 0.1%) noninvasive measure of fitness for the RNA species currently growing in its front. Evolution may be followed from changes in the front velocity, and these differ from wave to wave. Thousands o
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8. Signal sequence within FcγRIIA controls calcium wave propagation patterns: Apparent role in phagolysosome fusion
Calcium oscillations and traveling calcium waves have been observed in living cells, although amino acid sequences regulating wave directionality and downstream cell functions have not been reported. In this study we identify an amino acid sequence within the cytoplasmic domain of the leukocyte IgG receptor FcγRIIA that affects the amplitude of calcium spik
The National Academy of Sciences.
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9. Cell behavior in traveling wave patterns of myxobacteria
Cells in the early stages of starvation-induced fruiting body development migrate in a highly organized periodic pattern of equispaced accumulations that move as traveling waves. Two sets of waves are observed moving in opposite directions with the same wavelength and speed. To learn how the behavior of individual cells contributes to the wave pattern,
The National Academy of Sciences.
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10. Introducing phase analysis light scattering for dielectric characterization: measurement of traveling-wave pumping.
Phase analysis light scattering (PALS) was applied to characterize a high-frequency traveling-wave (TW) micropump. Field strength and frequency characteristics were measured for aqueous solutions up to 40 MHz and conductivities of 16 mS/m. The TW field was generated by an ultramicroelectrode array of intercastellated electrodes, which were driven by square-t
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11. Traveling waves of in vitro evolving RNA.
Populations of short self-replicating RNA variants have been confined to one side of a reaction-diffusion traveling wave front propagating along thin capillary tubes containing the Q beta viral enzyme. The propagation speed is accurately measurable with a magnitude of about 1 micron/sec, and the wave persists for hundreds of generations (of duration less tha
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12. Averaging and renormalization for the Korteveg–deVries–Burgers equation
We consider traveling wave solutions of the Korteveg–deVries–Burgers equation and set up an analogy between the spatial averaging of these traveling waves and real-space renormalization for Hamiltonian systems. The result is an effective equation that reproduces means of the unaveraged, highly oscillatory, solution. The averaging enhances the appare
National Academy of Sciences.