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Constanta, Romania

Ovidius University of Constanta is a public higher education institution in Constanţa, founded in 1961 as a Pedagogical Institute and transformed into a comprehensive university in 1990. As the Charter of the university states, the Pedagogical Institute was founded by Order of the Ministry of Education no. 654 of 1961, comprising four faculties. By State Council Decree no. 209 of 1977 the institute was transformed in Higher Education Institute and reorganized. By Government Decision 209 of 1990 the institute was transformed in university and, a year later, by Order of the Ministry of Education and Science no. 4894 of 1991 the university was given the present name. Wikipedia.

Cristea I.,University of Udine | Stefanescu M.,Ovidius University
European Journal of Combinatorics | Year: 2010

In this paper we associate a hypergroupoid 〈 H, ⊗ρ 〉 with an n-ary relation ρ defined on a nonempty set H. We investigate when it is an Hv-group, a hypergroup or a join space. Then we determine some connections between this hypergroupoid and Rosenberg's hypergroupoid associated with a binary relation. © 2009 Elsevier Ltd. All rights reserved. Source

Cogalniceanu D.,Ovidius University | Cogalniceanu G.-C.,Romanian Academy
Biodiversity and Conservation | Year: 2010

Biodiversity is declining worldwide under increasing human pressure. Since the location of and the threats are unevenly distributed and the resources available for conservation are limited, prioritization is essential to reduce the losses. Most conservation efforts until now proved to be ineffective in stopping the present worldwide decline of threatened species. We focus on the European Union (EU) after the repeated enlargements in the last decade, from 15 to 27 countries, by considering the present conservation priorities that have shifted towards a continental scale approach. The situation in the EU indicates that despite the differences in wealth across countries, there are no significant differences in the number and surface of protected areas between them, so re-evaluating conservation priorities at a continental scale and a reallocation of funds is required. A major limitation in priority settings for conservation is data availability. We recommend including in the decision process data provided by phylogeographic studies. This will prevent the decline of populations and species with evolutionary potential from centres of speciation and climate refugia. Recent EU members from central and eastern Europe still retain high biodiversity with a rather good conservation status. A large number of areas with high evolutionary potential identified by phylogeographic studies are located there and should be considered priorities within the context of global changes, as a proactive approach. We recommend a periodic re-evaluation of the status of species and habitats based on current research results, harmonization between the priority species listed in the conventions, directives and Red Lists at both EU and national levels. © Springer Science+Business Media B.V. 2010. Source

Culetu H.,Ovidius University
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics | Year: 2011

Finite entropy and energy are obtained for the horizon of a Rindler observer on the grounds of the nonstatic character of the geometry beyond the horizon. Edery-Constantineau prescription is used to find the dynamical phase space of this particular spacetime. The number of microstates rooted from the ignorance of a Rindler observer of the parameter t from the nonstationary region are calculated. The entropy expression is also obtained from the electric field on the Rindler horizon generated in the comoving system of a uniformly accelerated charge.We suggest that the gravitational energy density constructed by means of the horizon energy and using the Holographic Principle is proportional to g2, similar with a result recently obtained by Padmanabhan. © 2011 Elsevier B.V. Source

Bogdan C.M.,Ovidius University
International Journal of Computers, Communications and Control | Year: 2011

The goal of using virtual and augmented reality technologies in therapeutic interventions simulation, in the fixed prosthodontics (VirDenT) project, is to increase the quality of the educational process in dental faculties, by assisting students in learning how to prepare teeth for all-ceramic restorations. Its main component is an e-learning virtual reality-based software system that will be used for the developing skills in grinding teeth, needed in all-ceramic restorations. This paper presents a domain ontology that formally describes the knowledge of the domain problem that the VirDenT e-learning system dealt with. The ontology was developed based on the UML models of the VirDenT information system, making sure in this way the ontology captures knowledge identified and described in the analysis of the information system. At first, we constructed the taxonomy of these concepts, using the DOLCE ontology and its modules. Then, we defined the conceptual relations between the concepts. We also added SWRL rules that formally describe the business rules and knowledge previously identified. Finally, with the assistance of the Pellet reasoner system, we checked the ontology consistency. © 2006-2011 by CCC Publications. Source

Culetu H.,Ovidius University
International Journal of Theoretical Physics | Year: 2015

A modified version of the Reissner-Nordstrom metric is proposed on the grounds of the nonlinear electrodynamics model. The source of curvature is an anisotropic fluid with pr=−ρ which resembles the Maxwell stress tensor at r>>q2/2m, where q and m are the mass and charge of the particle, respectively. We found the black hole horizon entropy obeys the relation S=|W|/2T=AH/4, with W the Komar energy and AH the horizon area. The electric field around the source depends not only on its charge but also on its mass. The corresponding electrostatic potential Φ(r) is finite everywhere, vanishes at the origin and at r=q2/6m and is nonzero asymptotically, with Φ∞=3m/2q${\Phi }_{\infty } = 3m/2q$. © 2015, Springer Science+Business Media New York. Source

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