Scaling Laws
Mostrando 13-24 de 31 artigos, teses e dissertações.
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13. Research on pinch plasma focus devices of hundred of kilojoules to tens of joules
At present the Plasma Physics and Plasma Technology Group of the Comisión Chilena de Energía Nuclear (CCHEN) has the experimental facilities in order to study fast dense transient discharges in a wide range of energy and current, namely: I) energy from hundred of kilojoules to tens of joules, II) current from megaamperes to tens of kiloamperes. Also severa
Brazilian Journal of Physics. Publicado em: 2004-12
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14. A lÃgica da diversidade : complexidade e dinÃmica em assentamentos espontÃneos
In this thesys squatter settlements and slums are presented as truly complex phenomena, characterised by an implicit order identified in their morphological strutucture and in their growth dynamics. Slums and squatter settlements, in this approach, are seen as self-organised systems, and the idea of merely disordered urban object is desmystifyed. We point up
Publicado em: 2003
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15. Statistics of turbulence induced by magnetic field
Using the TCABR tokamak facility, we analyze turbulent electrostatic fluctuations in a stationary toroidal magnetoplasma, created by radio-frequency waves and confined by two different toroidal magnetic fields. The increase of toroidal magnetic field leads to gradients in the mean plasma radial profiles and the onset of electrostatic turbulence. For the turb
Brazilian Journal of Physics. Publicado em: 2002-03
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16. Leis de escala e dimensão fractal em filmes finos : microscopia de força atomica e tecnicas eletroquimicas
In this work, the surface morphology of NiOx and MoOx thin films deposited by r.f. sputtering was studied by atomic force microscopy and electrochemical techniques (cyclic voltammetry and electrochemical impedance spectroscopy). For each technique, the surface characterization was done by the fractal dimension, using the concept of scaling laws. The results
Publicado em: 2002
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17. Liquidos de Luttinger não homogeneos
In this work, we study inhomogeneous strongly correlated electron systems. A Luttinger liquid superlattice, modeled by a repeated pattern of two different Luttinger liquids was considered. We find that the effective low-energy description amalgamates features of both types of liquids in proportion to their spatial extent. The Drude peak is given by the produ
Publicado em: 2001
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18. Estudos de relaxação magnetica em supercondutores do tipo - II
We present in this work a study of magnetic relaxation in superconducting Y1Ba2CU3O7-d samples. We have used a single crystal grown in zirconia crucible, with Tc ~ 90 K and D T ~ 2 K; and a directionally solidified MTG sample with 17 % of Y211, Tc ~ 91 K and .D T ~ 2 K for H = 10 Oe. We discuss in a simplified manner the most relevant aspects of the magnetic
Publicado em: 2001
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19. Efeitos de tamanho em cadeias de Heisenberg-ising com interações antiferromagneticas
Finite Heisenberg-Ising quantum chains, for spin s = 1/2 and periodic boundary conditions, are exactly solved by numerical methods diagonalizing the Hamiltonian using the Lanczos method up to size N = 28 spins. Interesting physical quantities are computed, including the ground state energy, the mass gap, the spin-wave velocity, and correlation functions. Sca
Publicado em: 1991
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20. Scaling theory for quasibrittle structural failure
This inaugural article has a twofold purpose: (i) to present a simpler and more general justification of the fundamental scaling laws of quasibrittle fracture, bridging the asymptotic behaviors of plasticity, linear elastic fracture mechanics, and Weibull statistical theory of brittle failure, and (ii) to give a broad but succinct overview of various applica
National Academy of Sciences.
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21. Scaling laws for fully developed turbulent flow in pipes: Discussion of experimental data
We compare mean velocity profiles measured in turbulent pipe flows (and also in boundary layer flows) with the predictions of a recently proposed scaling law; in particular, we examine the results of the Princeton “superpipe” experiment and assess their range of validity.
The National Academy of Sciences of the USA.
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22. Scaling in animal group-size distributions
An elementary model of animal aggregation is presented. The group-size distributions resulting from this model are truncated power laws. The predictions of the model are found to be consistent with data that describe the group-size distributions of tuna fish, sardinellas, and African buffaloes.
The National Academy of Sciences.
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23. Scaling phenomena in the Internet: Critically examining criticality
Recent Internet measurements have found pervasive evidence of some surprising scaling properties. The two we focus on in this paper are self-similar scaling in the burst patterns of Internet traffic and, in some contexts, scale-free structure in the network's interconnection topology. These findings have led to a number of proposed models or “explanations�
National Academy of Sciences.
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24. Heterogeneity explains features of “anomalous” thermodynamics and statistics
Phenomena characterized by power-law probability distributions abound in nature and the applied sciences. We show that many of these power laws are well described by the Student, or t, distribution, and we discuss the origin of this universality based on three examples (Brownian motion, Knudsen diffusion in rough pores, and bubbly multiphase flow). These cas
National Academy of Sciences.