Algunos aspectos de la situación económica de América Latina en 1962 = Some aspects of the Latin American economic situation in 1962

Incluye Bibliografía

Tjon Lines and Scaling Limit in Four-Body Systems

The fixed-slope correlation between tetramer and trimer binding energies, observed by Tjon in the context of nuclear physics, is mainly a manifestation of the dominance of the two-nucleon force in the nuclear potential, which makes the four-body scale on the order of the three-body one. In a more general four-boson case, the correlation between tetramer and trimer binding energies has a non-fixed slope, which expresses the dependence on the new scale. The associated scaling function generates a family of Tjon lines. This conclusion relies on a recent study with weakly-bound four identical bosons, within a renormalized zero-range Faddeev-Yakubovsky formalism. © 2012 Springer-Verlag.

Review of the economic situation in Latin America during the early months of 1955

Includes bibliography

Coyuntura monetaria internacional y la reforma del sistema = Present international monetary situation and the reform of the international monetary system

Incluye Bibliografía

La situación económica de América Latina durante 1955 = The economic situation in Latin America during 1955

Incluye Bibliografía

La situación argentina y la nueva política económica = The situation in Argentina and the new economic policy

Incluye Bibliografía

Examen preliminar de la situación económica de América Latina en 1956 = Preliminary view of the economic situation in Latin America during 1956

Incluye Bibliografía

Situación y evolución de la agricultura y la alimentación en América Latina = Situation and evolution of agriculture and food supplies in Latin America

Incluye Bibliografía

The capital goods industry: situation and challenges

Includes bibliography

Evolution and present situation of styles of development

Includes bibliography

One-dimensional Fermi accelerator model with moving wall described by a nonlinear van der Pol oscillator

A modification of the one-dimensional Fermi accelerator model is considered in this work. The dynamics of a classical particle of mass m, confined to bounce elastically between two rigid walls where one is described by a nonlinear van der Pol type oscillator while the other one is fixed, working as a reinjection mechanism of the particle for a next collision, is carefully made by the use of a two-dimensional nonlinear mapping. Two cases are considered: (i) the situation where the particle has mass negligible as compared to the mass of the moving wall and does not affect the motion of it; and (ii) the case where collisions of the particle do affect the movement of the moving wall. For case (i) the phase space is of mixed type leading us to observe a scaling of the average velocity as a function of the parameter (χ) controlling the nonlinearity of the moving wall. For large χ, a diffusion on the velocity is observed leading to the conclusion that Fermi acceleration is taking place. On the other hand, for case (ii), the motion of the moving wall is affected by collisions with the particle. However, due to the properties of the van der Pol oscillator, the moving wall relaxes again to a limit cycle. Such kind of motion absorbs part of the energy of the particle leading to a suppression of the unlimited energy gain as observed in case (i). The phase space shows a set of attractors of different periods whose basin of attraction has a complicated organization. © 2013 American Physical Society.

Mexico: the plan and the current situation

Includes bibliography

Neo-liberal structural reforms in Latin America: the current situation

Includes bibliography