arXiv subjects

Voicu Dolocan

Publications and source records attributed to Voicu Dolocan.

11 recordsLinked to original sources

arXiv2026

Multiferroic Properties of Electrospun CFO-BCTSn Nanocomposites for Magnetoelectric and Magnetic Field Sensing Applications

Multiferroic CFO-BCTSn composite nanofibers were synthesized using a sol-gel electrospinning method. Electron microscopy revealed well-defined fibers with diameters of 120-150 nm. Structural analyses using X-ray diffraction, Raman spectroscopy, and high-resolution transmission electron microscopy confirmed the coexistence of the spinel CFO phase and the perovskite BCTSn phase without detectable secondary phases. Magnetic hysteresis measurements demonstrated the magnetic behavior of the nanofibers, while piezoresponse force microscopy confirmed their piezoelectric properties. Magnetoelectric coupling was evidenced by differences between the magnetic hysteresis loops of electrically poled and unpoled samples. These lead-free composite nanofibers show potential for nanoscale magnetoelectric devices and magnetic field sensing applications.

cond-mat.mtrl-sci↗

arXiv2017

On the generation of the particles through spontaneous symmetry breaking

In this paper we present the Weiberg-Salam-Glashow model of the electroweak interactions. With a specific choice of parameters can be obtained massive Z and W$^{\pm}$ bosons , while keeping the photon massless. These results are obtained by breaking the local gauge invariant SU(2)$_L \times$ U(1)$_Y$ symmetry. The same Higgs doublet which generates W$^{\pm}$ and Z masses is also sufficient to give masses to the leptons.

physics.gen-ph↗

arXiv2017

On the generation of the quarks through spontaneous symmetry breaking

In this paper we present the state of the art about the quarks: group SU(3), Lie algebra, the electric charge and mass. The quarks masses are generated in the same way as the lepton masses. It is constructed a term in the Lagrangian that couples the Higgs doublet to the fermion fields.

physics.gen-ph↗

arXiv2016

The question of charge and of mass

There are two long-range forces in the Universe, electromagnetism and gravity.We have found a general expression for the energy of interaction in these cases alphaXhbarXc/r, where alpha is the fine structure constant and r is the distance between the two particles.In the case of the electromagnetic interaction we have alphaxhbarxc=e^2/4pixepsilon, where e is the gauge charge, which is the elementary electron charge. In the case of the gravitational interaction alphaxhbarxc=GxM^2where M=1.85x10^(-9) kg is the gauge mass of the particle.This is a giant particle. A system of like charged giant particles, would be a charged superfluid. By spontaneous breaking of a gauge symmetry are generated the Higgs masive bosons.The unitary gauge assure generation of the neutral massive particles. The perturbation from the unitary gauge generates charged massive particles. Also, the Higgs boson decays into charged and neutral particles.The Tesla coil is the user of the excitations of the vacuum.

physics.gen-ph↗

arXiv2016

Effect of the magnetic moment on the interaction energy between particles

In this paper we take into account the effect of the magnetic moment on the Yukawa and Coulomb interaction between particles. We find that the Yukawa's and Coulomb's laws are modified by a factor cosine, whose argument depends on the magnetic moment of the particles and also, on the distance between the two particles. The obtained results are applied to ferromagnetism and are in a good agreement with experimental data.

cond-mat.other↗

arXiv2015

Evaluation of the energy states of hydrogen atom using Schroedinger equation with a Coulomb potential modified by the interaction between the magnetic moments of the proton and electron

By using a Coulomb potential modified by the interaction between the magnetic moments of the electron and proton, we have calculated the energy levels of a hydrogen atom. We have obtained fine structure, hyperfine structure and the Lamb shift. All these are obtained from a simple formula which is a direct solution of the Schroedinger equation. The obtained results are in a good agreement with experimental data. For example, the hyperfine splitting between the energy levels of the states 1S1/2,1 and 1S1/2,0 is of the order of 5.6x10^(-6) eV, which is the source of the famous "21 cm line" which is strongly useful to radio astronomers for tracking hydrogen in the interstellar medium of galaxies. The energy of the states nP1/2 is lower than those of the states nS1/2 (Lamb shift), because in the first case the interaction between the magnetic moments of the proton and electron spins is diminished by the spin-orbit coupling.

physics.gen-ph↗

arXiv2015

Effects of the interaction between the magnetic moments on the energy levels of a pionic atom

We present the calculation of the binding energy of 2p pion for various central charges Z. We have taken into account the interaction between the magnetic moment of the nucleus and the orbital magnetic moment of the pion. The obtained results show that the interaction between the magnetic moments decreases teh binding energy. This decrease is larger when the two magnetic moments add one another. Also, the binding energy increases with Z increasing.

physics.gen-ph↗

arXiv2014

Effects of the interaction between the magnetic moments of the proton and electron on the energy states of hydrogen atom

We make a comparison between the energy levels of the hydrogen atom, calculated by using standard methods, and that by using a modified Coulomb potential due to the interaction between the magnetic moments of the proton and electron. In this later method we use to ways. One is that in which we solve the Schroedinger equation with the modified Coulomb potential and some constraint conditions. The other is that in which we expand the modified Coulomb potential in Taylor series. The obtained results show that the first way gives a better agreement with experimental data.

physics.atom-ph↗

arXiv2014

On the Interaction between Fermions via Massless Bosons and Massive Particles

By using a Hamiltonian based on the coupling through flux lines, we have calculated the interaction energy between two fermions via massless bosons as well as via massive particles. In the case of interaction via massless bosons we obtain an equivalent expression for the Coulomb's energy on the form, where is the fine structure constant. In the case of the interaction via massive particles we obtain that the interaction energy contains a term building the potential well. Taking into account the spin-spin interaction of the nucleons, we show that this interaction modulates the interaction potential through a cosine factor. The obtained results are in good agreement with experimental data, for example, of deuteron.

nucl-th↗

arXiv2014

Evaluation of the Coulomb and exchange integrals for higher excited states of helium atom, taking into account the interaction between magnetic moments of the electrons

We have calculated the total energy of the helium atom in higher excited state. The Coulomb and exchange integrals are evaluated via spherical harmonics. The interaction of the magnetic moments of the electrons between them and also with the magnetic moments of the nucleus was taken into account through a cosine term in the Coulomb potential. The obtained results are in agreement with experimental data.

physics.atom-ph↗

arXiv2010

A model for semantic integration of business components

Today, reusable components are available in several repositories. These last are certainly conceived for the reusing However, this re-use is not immediate; it requires, in the fact, to pass through some essential conceptual operations, among them in particular, research, integration, adaptation, and composition. We are interested in the present work to the problem of semantic integration of heterogeneous Business Components. This problem is often put in syntactical terms, while the real stake is of semantic order. Our contribution concerns a model proposal for Business components integration as well as resolution method of semantic naming conflicts, met during the integration of Business Components.

cs.SE↗