45 citations · 77 across the 4 of their papers we have counts for
7 papers
Simulation of quantum zero-point effects in water using a frequency-dependent thermostat
Sriram Ganeshan, Rafael Ramírez, M. V. Fernández-Serra
Molecules like water have vibrational modes with a zero-point energy well above room temperature. As a consequence, classical molecular dynamics simulations of their liquids largel…
Various aspects of differential equations having a complete set of independent first integrals
R. Ramírez, N. Sadovskaia
In this paper we study the differential equations in having a complete set of independent first integrals. In particular we study the case when the first integ…
Path integral Monte Carlo simulations for rigid rotors and their application to water
Eva G. Noya, Luis M. Sesé, Rafael Ramírez +3
In this work the path integral formulation for rigid rotors, proposed by Müser and Berne [Phys. Rev. Lett. {\bf 77}, 2638 (1996)], is described in detail. It is shown how this form…
Cartesian approach for constrained mechanical systems
Rafael Ramírez, Natalia sadovskaia
In the history of mechanics, there have been two points of view for studying mechanical systems: Newtonian and Cartesian. According the Descartes point of view, the motion of mecha…
Electrical Conductivity in Magnesium-Doped Al_2 O_3 Crystal at Moderate Temperatures
M. Tardío, R. Ramírez, R. González +2
AC and DC electrical measurements between 273 and 800 K were used to characterize the electrical conductivity of Al_2 O_3:Mg single crystals containing [Mg]^{0} center. At low fiel…
The Feynman effective classical potential in the Schrödinger formulation
Rafael Ramírez, Telesforo López-Ciudad
New physical insight into the correspondence between path integral concepts and the Schrödinger formulation is gained by the analysis of the effective classical potential, that is…