Shock Waves
Mostrando 13-24 de 56 artigos, teses e dissertações.
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13. Ondas de choque em condensados de Bose-Einstein e espalhamento inelástico de átomos em um potencial de dois poços / Shock waves in Bose-Einstein condensates and inelastic scattering of atoms in a double well
Nesta tese estudamos dois problemas diferentes na área de átomos ultra frios: Ondas de choque em condensados de Bose-Einstein e Espalhamento inelástico de átomos em um potencial de dois poços. No primeiro problema, estudamos o fluxo supersônico de um condensado de Bose-Einstein (BEC) através de um obstáculo macroscópico impenetrável delgado no sist
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/03/2011
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14. The lithotripsy table height: a novel predictor of outcome in shockwave lithotripsy
BACKGROUND: Outcome of Extracorporeal Shockwave Lithotripsy (SWL) is determined by physical factors that affect stone fragmentation and clearance. PURPOSE: To evaluate the predictive value of the Lithotripsy Table Height (LTH) in SWL outcome. Lithotripsy Table Height (LTH) is a variable that represents skin to therapy head distance, and it is proportional to
International braz j urol. Publicado em: 2011-06
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15. Relaxation approaches to the optimal control of the Euler equations
The treatment of control problems governed by systems of conservation laws poses serious challenges for analysis and numerical simulations. This is due mainly to shock waves that occur in the solution of nonlinear systems of conservation laws. In this article, the problem of the control of Euler flows in gas dynamics is considered. Numerically, two semi-line
Computational & Applied Mathematics. Publicado em: 2011
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16. Efeito da tansulosina e do nifedipino na eliminação de fragmentos após litotripsia extracorpórea por ondas de choque em pacientes com cálculos renais: estudo prospectivo, duplo-cego e randomizado / Effect of tamsulosin and nifedipine on the clearance of fragments after extracorporeal shock waves lithotripsy in patients with kidney stones - a prospective, double-blind and randomized study
Purpose: We evaluated the effects of the adjuvant use of tamsulosin and nifedipine after extracorporeal shock wave lithotripsy (SWL) for 5-20 mm kidney stones. Materials and Methods: We conducted a randomized double-blind trial involving 136 patients with radiopaque kidney stones between 2006 and 2009. Patients were divided into three groups to receive daily
Publicado em: 2011
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17. Characterization of heat waves affecting mortality rates of broilers between 29 days and market age
Climate may affect broiler production, especially where there are heat waves, which may cause high mortality rates due to the heat stress. Heat wave prediction and characterization may allow early mitigation actions to be taken. Data Mining is one of the tools used for such a characterization, particularly when a large number of variables is involved. The ob
Revista Brasileira de Ciência Avícola. Publicado em: 2010-12
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18. An unstructured grid implementation of high-order spectral finite volume schemes
The present work implements the spectral finite volume scheme in a cell centered finite volume context for unstructured meshes. The 2-D Euler equations are considered to represent the flows of interest. The spatial discretization scheme is developed to achieve high resolution and computational efficiency for flow problems governed by hyperbolic conservation
Journal of the Brazilian Society of Mechanical Sciences and Engineering. Publicado em: 2010-12
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19. Formação de sólitons em condensados de Bose-Einstein e em meios ópticos / Formation of solitons in Bose-Einstein condensates and in photorefractive media
Different kinds of solitons have already been observed in various nonlinear optical media, and their behavior has been explained in the frameworks of such mathematical models as the nonlinear Schrödinger and generalized nonlinear Shrödinger equations for different dimensions and geometries. However, there are situations when many solitons are generated so
Publicado em: 2010
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20. Waves in nuclear matter / Ondas na matéria nuclear
Assuming that nuclear matter can be treated as a perfect fluid, we study the propagation of perturbations in the baryon density. The equation of state is derived from a relativistic mean field model, which is a variant of the non-linear Walecka model. The expansion of the Euler and continuity equations of relativistic hydrodynamics around equilibrium configu
Publicado em: 2009
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21. A study of shock wave front and magnetic cloud extent in the inner heliosphere using observations from multi-spacecrafts / Estudo da extensão das frentes de choque e das nuvens magnéticas na heliosfera interna usando observações de múltiplas espaçonaves.
As duas sondas Helios viajaram na heliosfera interna do final do ano de 1974 até o início do ano de 1986, variando sua posição em longitude e distância radial (de 0.3 a 1 AU). Elas coletaram dados de plasma e campo magnético de alta resolução durante um ciclo solar completo. Mais de 390 ondas de choque interplanetárias guiadas por Ejeções Coronais
Publicado em: 2009
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22. Estudo da extensão das frentes de choque e das nuvens magnéticas na heliosfera interna usando observações de múltiplas espaçonaves. / A study of shock wave front and magnetic cloud extent in the inner heliosphere using observations from multi-spacecrafts
As duas sondas Helios viajaram na heliosfera interna do final do ano de 1974 até o início do ano de 1986, variando sua posição em longitude e distância radial (de 0.3 a 1 AU). Elas coletaram dados de plasma e campo magnético de alta resolução durante um ciclo solar completo. Mais de 390 ondas de choque interplanetárias guiadas por Ejeções Coronais
Publicado em: 2009
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23. Effects of repeated extracorporeal shock wave on kidney apoptosis of normal and diabetic rat
OBJECTIVE: To assess the effect of repeated extracorporeal shock waves (ESW) on the apoptosis of renal parenchyma in normal and diabetic rats by the caspase-3 expression. MATERIALS AND METHODS: 80 rats were assigned for ESW (Direx Tripter X1® - 14 KVA) to one of three groups with 50% rats with diabetes (A) and 50% normal (B) in each: G1 (n = 40): no ESW; G2
International braz j urol. Publicado em: 2008-02
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24. Seção de choque de absorção de buracos negros de Schwarzschild e de buracos acústicos canônicos / Section of shock of absorption of black holes of Schwarzschild and of canonical acoustic holes
In this dissertation we compute the absorption cross section of Schwarzschild black holes for the massless scalar and electromagnetic fields. We also compute the absorption cross section of canonical acoustic holes for sound waves. We use a numerical method to obtain the results in arbitrary frequencies. We also obtain analytic expressions for the low- and h
Publicado em: 2008