22 citations · 127 across the 17 of their papers we have counts for
17 papers
Quantum phase transitions of the extended isotropic XY model with long-range interactions
F. G. Ribeiro, J. P. de Lima, L. L. Goncalves
The one-dimensional extended isotropic XY model (s=1/2) in a transverse field with uniform long-range interactions among the \textit{z} components of the spin is considered. The mo…
Quantum transitions of the XY model with long-range interactions on the inhomogenous periodic chain
J. P. De Lima, L. L. Goncalves
The isotropic XY model in a transverse field, with uniform long-range interactions among the transverse components of the spins, on the inhomogeneous periodic chain, is s…
The anisotropic XY model on the inhomogeneous periodic chain
J. P. de Lima, L. L. Goncalves, T. F. A. Alves
The static and dynamic properties of the anisotropic XY-model on the inhomogeneous periodic chain, composed of cells with different exchange interactions and magn…
Fractal analysis of weld defect patterns obtained by radiographic tests
J. A. Tesser, R. T. Lopes, A. P. Vieira +2
This paper presents a fractal analysis of radiographic patterns obtained from specimens with three types of inserted welding defects: lack of fusion, lack of penetration, and poros…
Characterization of welding defects by fractal analysis of ultrasonic signals
A. P. Vieira, E. P. de Moura, L. L. Goncalves +1
In this work we apply tools developed for the study of fractal properties of time series to the problem of classifying defects in welding joints probed by ultrasonic tecniques. We…
Critical properties of the XXZ model with long-range interactions on the double chain
J. P. de Lima, L. L. Goncalves
The model in a transverse field on a double chain with a uniform long-range interaction among the components of the spins is considered. The nearest-neighbour…