Articole ştiinţifice: Recent submissions

Now showing items 1761-1780 of 4684

Shape Anisotropy and Magnetization of Ferromagnetic Nanostructures

COJOCARU, S.; DOHOTARU, L. A.; MOSKALENKO, V. A. (American Scientific Publishers, 2012)

The temperature dependence of the spontaneous magnetization in rectangular ferromagnetic nanostructures is derived in the framework of a quantum microscopic approach taking into account discreetness of excitation spectrum. ...
Phenomenologic versus microscopic description of the nanoparticle magnetization

COJOCARU, S.; DOHOTARU, L. A.; MOSCALENCO, V. A. (Editura Academiei Române, 2013)

We critically discuss the existing phenomenological description of experimental and numerical simulation data on temperature dependence of nanoparticle and nanocluster magnetization in the context of the recently proposed ...
Dynamics of phonon clouds of correlated polarons

MOSKALENKO, V. A.; DOHOTARU, L. A.; DIGOR, D. F.; CEBOTARI, I. D. (Springer Nature Switzerland, 2014)

We investigate the Anderson-Holstein model with strong repulsion of impurity electrons using a strongcoupling approximation. The strong electron-phonon interaction determines the formation of polarons with heavy clouds of ...
Diagrammatic theory for the Anderson impurity model: Stationary property of the thermodynamic potential

MOSKALENKO, V. A.; ENTEL, P.; DOHOTARU, L. A.; CITRO, R. (Springer Nature Switzerland, 2009)

We propose a diagrammatic theory around the atomic limit for the normal state of the Anderson impurity model. The new diagram method is based on Wick’s theorem for conduction electrons and a generalized Wick’s theorem for ...
Diagrammatic theory for periodic Anderson model

MOSKALENKO, V. A.; DOHOTARU, L. A. (Springer Nature Switzerland, 2010)

Diagrammatic theory for Periodic Anderson Model has been developed, supposing the Coulomb repulsion of f — localized electrons as a main parameter of the theory. f-Electrons are strongly correlated and c-conduction electrons ...
Diagrammatic analysis of the Hubbard model: Stationary property of the thermodynamic potential

MOSKALENKO, V. A.; DOHOTARU, L. A. (Springer Nature Switzerland, 2010)

Diagrammatic approach proposed many years ago for strong correlated Hubbard model is developed for analyzing of the thermodynamic potential properties. The new exact relation between such renormalized quantities as ...
Diagrammatic analysis of the Hubbard model II: Superconducting state

MOSKALENKO, V. A.; DOHOTARU, L. A.; DIGOR, D. F.; CEBOTARI, I. D. (Cornell Univesity, 2010)

Diagrammatic analysis for normal state of Hubbard model proposed in our previous paper[1] is generalized and used to investigate superconducting state of this model. We use the notion of charge quantum number to describe ...
Diagram theory for the twofold-degenerate Anderson impurity model

MOSKALENKO, V. A.; DOHOTARU, L. A.; DIGOR, D. F.; CEBOTARI, I. D. (Springer Nature Switzerland, 2014)

We develop a diagram technique for investigating the twofold-degenerate Anderson impurity model in the normal state with the strong electronic correlations of d electrons of the impurity ion taken into account. We discuss ...
Diagram theory for the periodic Anderson model: Stationarity of the thermodynamic potential

MOSKALENKO, V. A.; DOHOTARU, L. A.; CITRO, R. (Springer Nature Switzerland, 2010)

We develop a diagram theory for the periodic Anderson model assuming that the Coulomb repulsion of localized f electrons is the main parameter of the theory. The f electrons are strongly correlated and the c conduction ...
Diagram analysis of the Hubbard model: Stationarity property of the thermodynamic potential

MOSKALENKO, V. A.; DOHOTARU, L. A.; CEBOTARI, I. D. (Springer Nature Switzerland, 2010)

The diagram approach proposed many years ago for the strongly correlated Hubbard model is developed with the aim to analyze the thermodynamic potential properties. A new exact relation between renormalized quantities such ...
Competing spin waves and superconducting fluctuations in strongly correlated electron systems

MOSKALENKO, V. A.; ENTEL, P.; DIGOR, D. F.; DOHOTARU, L. A. (Taylor & Francis, 2005)

A special diagram technique recently proposed for strongly correlated electron systems is used to study the pecularities of a spindensity-wave (SDW) in competition with superconductivity. This method allows to formulate ...
A novel diagrammatic technique for the single-site Anderson model

MOSKALENKO, V. A.; ENTEL, P.; DIGOR, D. F.; DOHOTARU, L. A.; CITRO, R. (Cornel Univesity, 2007)

A diagrammatic theory around the atomic limit is proposed for the single-impurity Anderson model in which the strongly correlated impurity electrons hybridize with free (uncorrelated) conduction electrons. Using this ...
A diagram approach to the strong coupling in the single-impurity Anderson model

MOSKALENKO, V. A.; ENTEL, P.; DIGOR, D. F.; DOHOTARU, L. A.; CITRO, R. (Springer Nature Switzerland, 2008)

We propose a diagram theory around the atomic limit for the single-impurity Anderson model in which the strongly correlated impurity electrons hybridize with free (uncorrelated) conduction electrons. Using this diagram ...
Исследование влияния фактора анизотропии на закономерность изменения объёма в элементах микроструктуры

МАРИНА, В. Ю.; МАРИНА, В. И. (Институт металлофизики им. Г. В. Курдюмова НАН Украины, 2017)

Исследованы закономерности флуктуаций шаровых тензоров напряжений в кристаллах с кубической решёткой в зависимости от их ориентации в однофазных поликристаллических материалах. Показано, что взаимодействия между кристаллами ...
Regularities of variation of spherical tensor in crystals of polycrystalline material under torsion action

MARINA, Vasile; MARINA, Viorica (Transilvania University of Brasov, 2016)

The laws of fluctuations of spherical stress tensors in cubic lattice crystals are investigated in function of their orientation in polycrystalline single-phase materials. It is shown that interactions among crystals in ...
Reading the possibilities to decode the microstructure characteristics from macroexperience

MARINA, Vasile (Universitatea “Dunărea de Jos”, Galaţi, 2004)

The paper present the problem of practical application of relationships between the structure and proprieties. Here, it is emphasised that the symmetry elements of crystal lattice, the phases weight and the type of interatomic ...
Fuzzy logic in automatic analysis of Google Analytics data

CHILAT, Sergiu (Institute of Mathematics and Computer Science, ASM, 2014)

This article presents a method for automation of the process of data analysis generated from Google Analytics, using fuzzy logic. After the method implementation, the user will get the most useful and suitable content ...
Explicit Thermal Stresses Within a Thermoelastic Half-Strip and Their Graphical Presentation Using Maple - 15 Soft

ȘEREMET, Victor; CREȚU, Ion; ȘEREMET, Dumitru (Institute of Mathematics and Computer Science, ASM, 2014)

This article presents a closed form of new solution of a particular boundary value problem (BVP) of thermoelasticity for a half-strip. The thermoplastic displacements and thermal stresses are created by an interior temperature ...
Methodology of matrix representation of higher order elasticity constants. Six order tensor

MARINA, Vasile; MARINA, Viorica (Institute of Mathematics and Computer Science, ASM, 2014)

The constitutive nonlinear equations of anisotropic materials are examined in reversible deformation area. The constitutive equations of the second order, in which the tensors of elastic constants of forth order listed, ...
Methodology of matrix representation of higher order elasticity constants. Fourth order tensor

MARINA, Vasile; MARINA, Viorica (Institute of Mathematics and Computer Science, ASM, 2014)

The constitutive nonlinear equations of anisotropic materials are examined in reversible deformation area. The constitutive equations of the second order, in which the tensors of elastic constants of forth order listed, ...

Now showing items 1761-1780 of 4684

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