Mónica Cardona

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The Bearded Vulture (Gypaetus Barbatus) is an endangered species in Eu-rope that feeds almost exclusively on bone remains provided by wild and domestic ungu-lates. In [1], we presented a P system in order to study the evolution of these species in the Pyrenees (NE Spain). Here, we present a new model that overcomes some limitations of the previous work(More)
In this paper, a P systems based general framework for modeling ecosystems dynamics is presented. Particularly, ecosystems are specified by means of multienviron-ment P systems composed of a finite number of environments, each of them having an extended P system with active membranes. The semantics is of a probabilistic type and it is implemented by(More)
The Bearded Vulture (Gypaetus barbatus) is an endangered species in Europe that feeds almost exclusively on bone remains of wild and domestic ungulates. In this paper, we present a model of an ecosystem related to the Bearded Vulture in the Pyrenees (NE Spain), by using P systems. The evolution of six species is studied: the Bearded Vulture and five(More)
In this paper we approach the problem of computing the n–th power of the transition matrix of an arbitrary Markov chain through membrane computing. The proposed solution is described in a semi–uniform way in the framework of P systems with external output. The amount of resources required in the construction is polynomial in the number of states of the(More)
In this paper we present a method to classify the states of a finite Markov chain through membrane computing. A specific P system with external output is designed for each boolean matrix associated with a finite Markov chain. The computation of the system allows us to decide the convergence of the process because it determines in the environment the(More)
Certified seed producers systematically select and propagate registered varieties year after year in order to maintain their uniformity and the original registered cultivar traits. However, natural mutations, spontaneous breeding between varieties and alien grain contamination can introduce undesirable variability. NRVC 980385 is a temperate japonica rice(More)
  • S F Gong, H T G Hentzell, A E Robertsson, L Hultman, S.-E Homstrom, G Radnoczi +93 others
  • 2005
71 hydrogen plasma treatment 3.6 SUMMARY Room temperature exposure to a RF hydrogen plasma can dramatically reduce the thermal budget for the crystallization of PECVD a-Si:H films. The hydrogen plasma treatment changes the microstructure of the q-Si:Hat the surface, and depletes hydrogen from the surface of the film. The plasma treatment creates seed nuclei(More)
One of the oldest open questions in semiconductor physics is the origin of the small splittings of the neutral acceptor ground state in silicon which lead to a distribution of doublet splittings rather than the fourfold-degenerate state of Gamma(8) symmetry expected in the absence of perturbations. Here we show that these acceptor ground state splittings(More)
Data are presented on in-plane transmission of light and photoluminescence for GaAs/AlAs multiple quantum wells ͑MQW's͒ uniaxially stressed along the z ˆ ϭ͓001͔ growth axis. This stress leads to the simplest possible form of competition between confinement and stress in these microstructures. We show that by measuring the frequency-dependent birefringence(More)
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