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Search Results: 1 - 10 of 191385 matches for " D. Felea "
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High precision framework for Chaos Many-Body Engine
I. V. Grossu,C. Besliu,D. Felea,Al. Jipa
Physics , 2013, DOI: 10.1016/j.cpc.2013.12.024
Abstract: In this paper we present a C# 4.0 high precision framework for simulation of relativistic many-body systems. In order to benefit from, previously developed, chaos analysis instruments, all new modules were designed to be integrated with Chaos Many-Body Engine [1,3]. As a direct application, we used 46 digits precision for analyzing the Butterfly Effect of the gravitational force in a specific relativistic nuclear collision toy-model. Trying to investigate the average Lyapunov Exponent dependency on the incident momentum, an interesting case of intermittency was noticed. Based on the same framework, other high-precision simulations are currently in progress (e.g. study on the possibility of considering, hard to detect, extremely low frequency photons as one of the dark matter components).
On Multi-valued Semantics for Logic Programs
Victor Felea
Journal of Applied Sciences , 2005,
Abstract: For a general program P, multi-valued interpretations and models are defined, considering a set of truth logic values and an undefined value. The program P may contain constant propositions, which are defined for each truth logic value. Two orderings between the set of all multi-valued interpretations are considered: one is Fitting ordering and the other is standard ordering. The semantics of type well-founded and of type stable for a program P are introduced. This study showed that the well-founded model is the least stable model with respect to Fitting ordering.
Extended Stable Models for Logical Programs with Many Negations
Victor Felea
Journal of Applied Sciences , 2002,
Abstract: The family of stable models for a logic program with one negation was studied by Melvin Fitting. We introduce extended stable model semantics of logic programs with many negations, which natural extends the notion of stable model semantics for logic programs with one negation. We use the notion of bilattice with two ordering which defines the structure of the family of stable models. The first one is called knowledge ordering, the second one is called degree of truth. For a vector of valuations in a billatice B, we define a pseudovaluation and an operator associated to a program . We also consider the notion of i-model for a program . For an operator we define a fixed-point iteration. This iteration is applied to the operator associated to and produces so-called extended stability operators. When the fixed-point iteration can be applied by n times, where n is the number of negations, then every fixed point of the last operator is an extended stable valuation of .
Testament – a source of family relations research. The case of Manuc Bey
Alina Felea
Codrul Cosminului , 2011,
Abstract: The article presents life of Manuc Bey, Dragoman of the Porte, state advisor of the Russian Empire which, was a well-known person in the early nineteenth century. Monographs, scientific and publishing articles were written with regard to his political activities. In this study, based on the testaments of Manuc Bey and his daughter Pemba, some details of relationships between Manuc family members are revealed, during the lives of his children, grandchildren and great-grandchildren. The research is based on both archival material and the published work.This testament caused several years of litigations between the heirs. At the same time, it is an important source for the mentality and daily study of the era, and for the survey of Manuc’s bloodlines. Manuc Bey’s descendants had dynastic links with known noble families not only in Russia but also abroad. Simultaneously, his descendants had been respected scientists in European academic milieu.
A delicate topic: inability of one of the spouses to pursue a conjugal life
Alina Felea
Codrul Cosminului , 2012,
Abstract: The article covers a topic related to family history – impotence and divorce, insufficiently treated in historiography. In this study based on concrete examples from Bessarabia, it will be presented the daily reality in the problem of divorce granted for or the inability of a spouse to conjugal life and how the canons of the church were respected in the first half of the nineteenth century. As sources of research were used documents from the funds of the State Archives of Republic of Moldova.
The theme of forgiveness in testaments and epitaphs in Romanian countries, Rzeczpospolita and the Russian Empire (XVIII Century-early XIX Century)
Alina Felea
Codrul Cosminului , 2011,
Abstract: The testaments and epitaphs stand out among the most important sources of research of attitudes towards the death. In this article we will refer only to a sequence addressed by these sources: Christian forgiveness, a subject insufficiently researched in historiography. Christian forgiveness, one of the basic principles of Christianity, although rare, was presented in the texts of testaments and epitaphs. Testators or the authors of epitaphs addressed to the Christians their will to be forgiven the sins committed during the life. But the request for forgiveness was addressed primarily to God, before whom they should appear and answer for their deeds.
Reflections on divorce in Bessarabia in the first half of the nineteenth century: the adultery
Alina Felea
Codrul Cosminului , 2012,
Abstract: The article covers a topic related to family history - divorce, insufficiently treated in historiography. In this study based on concrete examples from Bessarabia, it will be presented the daily reality in the problem of divorce granted for adultery and how the canons of the church were respected in the first half of the nineteenth century. As sources of research were used documents from the funds of the State Archives of Republic of Moldova, showing the fact of initiation of divorce processes by representatives of different social classes: nobles, townspeople, peasants, soldiers etc.
Some phenomenological considerations on the nuclear collisions at high energies
Grossu, I. V.;Besliu, C.;Jipa, Al.;Felea, D.;Bordeianu, C. C.
High Energy Physics - Phenomenology , 2007,
Abstract: We present some results obtained by applying the chaos theory on the numerical study of one threedimensional, relativistic, many-body quark system. The asymptotic freedom property is introduced by employing a harmonic term in the bi-particle potential. In this context, we used also the outcome of a semiclassical study, applied to the quark constituents of nucleons. Depending on the initial temperature parameter, the system can evolve toward an oscillating or an expansion regime. It is important to notice also a transition region, characterized by a partial fragmentation (higher degree of order). This effect can be observed near the critical temperature and is related to the partial overcoming of the potential barrier (corresponding to the farthest particles from the system). The degree of fragmentation is defined on the Shannon entropy basis and using the graphs theory. For analyzing the expansion tendency of one relativistic many-body system, we employed also the virial coefficient.
Code C# for chaos analysis of relativistic many-body systems
Grossu, I. V.;Besliu, C.;Jipa, Al.;Felea, D.;Bordeianu, C. C.;Stan, E.;Esanu, T.
High Energy Physics - Phenomenology , 2008, DOI: 10.1016/j.cpc.2010.04.015
Abstract: This work presents a new Microsoft Visual C# .NET code library, conceived as a general object oriented solution for chaos analysis of three-dimensional, relativistic many-body systems. In this context, we implemented the Lyapunov exponent and the "fragmentation level" (defined using the graph theory and the Shannon entropy). Inspired by existing studies on billiard nuclear models and clusters of galaxies, we tried to apply the virial theorem for a simplified many-body system composed by nucleons. A possible application of the "virial coefficient" to the stability analysis of chaotic systems is also discussed.
Semiclassical study on Proton and Neutron
I. V. Grossu,C. Besliu,Al. Jipa,D. Felea,C. C. Bordeianu
Physics , 2007,
Abstract: Starting from the existing semiclassical studies on hydrogenoid atoms, we propose a similar intuitive exercise for the three-body quark systems corresponding to protons and neutrons. In the frame of this toy model we try to explain both the stabilities of proton and neutron with respect to the nuclear interaction, and the spectrum of nucleonic resonances with J=1/2. Our choice is motivated also by a good agreement obtained for the up and down quark rest masses report. Taking into account the deterministic chaotic behavior of many-body systems, the discussed exercise could be understood as an interesting particular case of a quantum three-body problem which admits a semiclassical treatment.
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