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Search Results: 1 - 10 of 87876 matches for " I. Stancu "
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L/E-Flatness of the Electron-Like Event Ratio in Super-Kamiokande and a Degeneracy in Neutrino Masses
I. Stancu,D. V. Ahluwalia
Physics , 1999, DOI: 10.1016/S0370-2693(99)00811-4
Abstract: We show that the L/E-flatness of the electron-like event ratio in the Super-Kamiokande atmospheric neutrino data implies the equality of the expectation values for the muon and tau neutrino masses. We establish this result by obtaining a set of three constraints on the neutrino-oscillation mixing matrix as contained in the indicated flatness. The resulting 3x3 neutrino-oscillation matrix depends only on one angle. A remarkable result that follows directly from this matrix is the consistency between the mixing angles observed by LSND and Super-Kamiokande.
CP violation in neutrino oscillations and L/E flatness of the e-like event ratio at Super-Kamiokande
D. V. Ahluwalia,Y. Liu,I. Stancu
Physics , 2000, DOI: 10.1142/S0217732302006138
Abstract: We show that if the presently observed L/E-flatness of the electron-like event ratio in the Super-Kamiokande atmospheric neutrino data is confirmed then the indicated ratio must be {\em unity}. Further, it is found that once CP is violated the exact L/E flatness implies: (a) The CP-violating phase, in the standard parameterization, is narrowed down to two possibilities pm pi/2, and (b) The mixing between the second and the third generations must be maximal. With these results at hand, we argue that a dedicated study of the L/E-flatness of the electron-like event ratio by Super-Kamiokande can serve as an initial investigatory probe of CP violation in the neutrino sector. The assumptions under which these results hold are explicitly stated.
Duality for multiobjective fractional programming problems involving d -type-I n-set functions
Stancu-Minasian I.M.,Dogaru Gheorghe,Stancu M?d?lina Andreea
Yugoslav Journal of Operations Research , 2009, DOI: 10.2298/yjor0901063s
Abstract: We establish duality results under generalized convexity assumptions for a multiobjective nonlinear fractional programming problem involving d -type-I n -set functions. Our results generalize the results obtained by Preda and Stancu-Minasian [24], [25].
A compactness tool for the analysis of nonlocal evolution equations
Liviu I. Ignat,Tatiana I. Ignat,Denisa Stancu-Dumitru
Mathematics , 2013,
Abstract: In this paper we give a new compactness criterion in the Lebesgue spaces $L^p((0,T)\times \Omega)$ and use it to obtain the first term in the asymptotic behaviour of the solutions of a nonlocal convection diffusion equation. We use previous results of Bourgain, Brezis and Mironescu to give a new criterion in the spirit of the Aubin-Lions-Simon Lemma.
Multiobjective Programming Problem Involving B-(p,r)-Type I Functions
Anurag Jayswal,Ioan Stancu-Minasian,I. Ahmad
Lecture Notes in Engineering and Computer Science , 2012,
Abstract:
Efficiency and duality for multiobjective fractional variational problems with (ρ,b) - quasiinvexity
Mititelu ?tefan,Stancu-Minasian I.M.
Yugoslav Journal of Operations Research , 2009, DOI: 10.2298/yjor0901085m
Abstract: The necessary conditions for (normal) efficient solutions to a class of multi-objective fractional variational problems (MFP) with nonlinear equality and inequality constraints are established using a parametric approach to relate efficient solutions of a fractional problem and a non-fractional problem. Based on these normal efficiency criteria a Mond-Weir type dual is formulated and appropriate duality theorems are proved assuming (ρ,b) - quasi-invexity of the functions involved.
Evaluating fuzzy inequalities and solving fully fuzzified linear fractional programs
Stanojevi? B.,Stancu-Minasian I.M.
Yugoslav Journal of Operations Research , 2012, DOI: 10.2298/yjor110522001s
Abstract: In our earlier articles, we proposed two methods for solving the fully fuzzified linear fractional programming (FFLFP) problems. In this paper, we introduce a different approach of evaluating fuzzy inequalities between two triangular fuzzy numbers and solving FFLFP problems. First, using the Charnes-Cooper method, we transform the linear fractional programming problem into a linear one. Second, the problem of maximizing a function with triangular fuzzy value is transformed into a problem of deterministic multiple objective linear programming. Illustrative numerical examples are given to clarify the developed theory and the proposed algorithm.
Gaussian Effective Potential for the U(1) Higgs Model
R. Ibanez-Meier,I. Stancu,P. M. Stevenson
Physics , 1992,
Abstract: In order to investigate the Higgs mechanism nonperturbatively, we compute the Gaussian effective potential (GEP) of the U(1) Higgs model ("scalar electrodynamics"). We show that the same simple result is obtained in three different formalisms. A general covariant gauge is used, with Landau gauge proving to be optimal. The renormalization generalizes the "autonomous" renormalization for lambda-phi^4 theory and requires a particular relationship between the bare gauge coupling e_B and the bare scalar self- coupling lambda_B. When both couplings are small, then lambda is proportional to e^4 and the scalar/vector mass-squared ratio is of order e^2, as in the classic 1-loop analysis of Coleman and Weinberg. However, as lambda increases, e reaches a maximum value and then decreases, and in this "nonperturbative" regime the Higgs scalar can be much heavier than the vector boson. We compare our results to the autonomously renormalized 1-loop effective potential, finding many similarities. The main phenomenological implication is a Higgs mass of about 2 TeV.
Informational Asymmetry, Sustainable Growth, Exploitation and Obligation Risks
Dumitra Stancu,Ion Stancu
Theoretical and Applied Economics , 2006,
Abstract: Our paper starts from the relationship, apparently contradictory, between the better informed economic agents (managers, bankers) and the agents less informed than the first to be mentioned (the investors: shareholders and creditors). The asymmetric information concerns the company’s performance (or of its investment projects) and the company’s ability to put up with different manifestations of the risk associated with this kind of performance. Based on this asymmetric information, the better informed agents can profit, to their own advantage, from the others’ lack of information. Consequently, the signals should be sent so as to allow a clear distinction of profitable companies from unprofitable ones, signals which cannot be copied by the managers with an underperforming management: a. The sustainable growth based on retained earnings financing and also co-financed by managers; b. The degree of operational leverage to be proportional with the increase of modernizing managerial and technological expenses; c. The degree of financial leverage to be proportional with the volume of debts.
Quark model: recent issues
Stancu, Fl.
High Energy Physics - Phenomenology , 2007,
Abstract: In the first part I briefly survey recent issues in constituent quark models raised by the observation of unusual hadronic states. In particular I discuss the role of higher Fock components in the wave function of baryons and the possible interpretation of open charm and of new charmonium-type resonances as tetraquarks. In the second part I show support for the quark model dynamics obtained in a model independent way from the $1/N_c$ expansion approach of QCD which proved to be successful in describing baryon properties.
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