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- E Romera, J S Dehesa
- The Journal of chemical physics
- 2004

A new correlation measure, the product of the Shannon entropy power and the Fisher information of the electron density, is introduced by analyzing the Fisher-Shannon information plane of some two-electron systems (He-like ions, Hooke's atoms). The uncertainty and scaling properties of this information product are pointed out. In addition, the Fisher and… (More)

- M I Arnaldos, M D García, E Romera, J J Presa, A Luna
- Forensic science international
- 2005

Using the entomological evidence obtained in several forensic cases analyzed in our laboratory for comparison, we evaluated the results of an experimental study carried out in a semiurban setting to determine the structure of the sarcosaprophagous fauna from a Mediterranean region of SE Spain. In all, 18 orders of arthropods were collected. The summarized… (More)

Our aim in this paper is twofold. First, to find the necessary and sufficient conditions to be satisfied by a given sequence of real numbers ͕ n ͖ nϭ0 ϱ to represent the ''entropic moments'' ͐ [0,a] ͓(x)͔ n dx of an unknown non-negative, decreasing and differentiable ͑a.e.͒ density function (x) with a finite interval support. These moments are called… (More)

- Ricardo López-Ruiz, A. Nagy, Elvira Romera, Jaime Sanudo
- ArXiv
- 2009

A two-parameter family of complexity measures C ˜ ͑␣,͒ based on the Rényi entro-pies is introduced and characterized by a detailed study of its mathematical properties. This family is the generalization of a continuous version of the Lopez-Ruiz– Mancini–Calbet complexity, which is recovered for ␣ = 1 and  = 2. These complexity measures are obtained by… (More)

- Ricardo López-Ruiz, Jaime Sanudo, Elvira Romera, Xavier Calbet
- ArXiv
- 2011

In this chapter, a statistical measure of complexity and the Fisher-Shannon information product are introduced and their properties are discussed. These measures are based on the interplay between the Shannon information, or a function of it, and the separation of the set of accessible states to a system from the equiprobability distribution, i.e. the… (More)

- E Romera
- 2002

Several D-dimensional uncertainty-like relationships for N-body systems are obtained by means of the Fisher's information entropies in position and momentum spaces and the Stam's uncertainty principle. In addition, these relationships, the Fisher's entropies and the Stam's inequality are analysed numerically for all ground state neutral atoms from hydrogen… (More)

- E. Romera, J. C. Angulo
- 1999

General model-independent relationships among radial expectation values of the one-particle densities in position and momentum spaces for any quantum-mechanical system are obtained. They are derived from the Stam uncertainty principle and the recently reported lower bounds to the Fisher information entropy of both densities. The results are usually… (More)

- J C Angulo, E Romera, J S Dehesa
- 2000

Rigorous relationships among physically relevant quantities of atomic systems ͑e.g., kinetic, exchange, and electron–nucleus attraction energies, information en-tropy͒ are obtained and numerically analyzed. They are based on the properties of inverse functions associated to the one-particle density of the system. Some of the new inequalities are of great… (More)

- Elvira Romera, Francisco de Los Santos, Omar Al Hammal, Miguel A Muñoz
- Physical review. E, Statistical, nonlinear, and…
- 2008

Critical wetting transitions under nonequilibrium conditions are studied numerically and analytically by means of an interface-displacement model defined by a Kardar-Parisi-Zhang equation, plus some extra terms representing a limiting, short-ranged attractive wall. Its critical behavior is characterized in detail by providing a set of exponents for both the… (More)

- E Romera, J C Angulo
- The Journal of chemical physics
- 2004

Structural characteristics of the spherically averaged internally folded density or reciprocal form factor Br are studied within the Hartree-Fock framework for 103 neutral atoms, 54 singly charged cations, and 43 anions in their ground state. The function Br is classified throughout the Periodic Table into three types: (i) monotonic decrease from the… (More)

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