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Marinescu, M.; Chiriac, H., E-mail: marinescu@phys-iasi.ro

AbstractAbstract

[en] Magnetic relaxation (magnetic viscosity) experiments were conducted in nanocrystalline single and two-phase NdFeB melt spun ribbons. On hysteresis loops, at applied demagnetizing fields at some degree lager than H

_{c}, an anomalous non-monotonic variation M(t) has been found for all investigated samples either with exchange coupled or decoupled grains. On recoil curves, the same non-monotonic variation of the magnetization has been found in the case of suppressed fields lower than H_{c}Primary Subject

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ICM 2003: International conference on magnetism; Rome (Italy); 27 Jul - 1 Aug 2003; S0304885303019528; Copyright (c) 2003 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)

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Journal of Magnetism and Magnetic Materials; ISSN 0304-8853; ; CODEN JMMMDC; v. 272-276(6); p. E1943-E1945

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[en] There are described new types of thermo-electric cells, in which the semiconductor of Se of some previous cells was replaced by some other semiconductors like Ge, Cd, Sb, Si, giving similar results, and furnishing thus experimental evidence of the fact that a sheet of semiconductor lying between two sheets of metals of different nature and exposed to an uniform feeld of temperatures, gives, in certain conditions, a permanent current and thus an electric energy. Some theoretical considerations clarifies the conversion of heat into electrical energy in such systems. (author)

Original Title

Contributii la fundamentarea experimentala si teoretica a unei noi surse de energie electrica

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Studii si Cercetari de Fizica; v. 29(2); p. 125-132

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AbstractAbstract

[en] The long-range asymptotic form of the interaction potential surface for three neutral alkali-metal atoms in their ground states may be expressed as an expansion in inverse powers of inter-nuclear distances. The first leading powers are proportional to the dispersion coefficients for pairwise atomic interactions. They are followed by a term responsible for a three body dipole interaction. The authors results consist in evaluation of the three body dipole interaction coefficient between three alkali-metal atoms. The generalization to long-range n atom interaction terms will be discussed qualitatively

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27. annual meeting of the Division of Atomic, Molecular and Optical Physics (DAMOP) of the American Physical Society (APS); Ann Arbor, MI (United States); 15-18 May 1996; CONF-9605105--

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AbstractAbstract

[en] Two-color two-photon photoionization of hydrogen and alkali atoms is presented. The method based on a perturbation expansion is valid for low to moderately intense radiation fields. Three processes are considered leading to the photoionization. For the first process both photons are below threshold, and for the second process one photon is above the threshold with an energy less than the final energy of the photoelectron. The last process is identical to the continuum Raman (Compton) scattering where the first photon is absorbed high in the continuum and the second low energy photon is scattered. Photoionization cross sections of hydrogen and the alkali atoms are given as functions of the first photon energy and the photoelectron energy

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1993 American Physical Society annual meeting on atomic, molecular, and topical physics; Reno, NV (United States); 16-19 May 1993; CONF-9305421--

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Chiriac, H.; Marinescu, M.

Magnetic anisotropy and coercivity in rare-earth transition metal alloys. Proceedings

Magnetic anisotropy and coercivity in rare-earth transition metal alloys. Proceedings

AbstractAbstract

[en] The study of the crystallization behavior correlated with thermomagnetic measurements on the Nd

_{8}Fe_{82}CuNb_{3}B_{6}and Nd_{8}Fe_{77}Co_{5}CuNb_{3}B_{6}initially amorphous melt-spun ribbons suggests that the proper annealing temperature required in the obtaining of a structure free from metastable phases, must exceed 700 C. Results on the effect of the magnetic-field annealing on the investigated melt-spun ribbons are presented. There was found that the magnetic field applied during annealing the amorphous precursors affects the coercivity as well as the remanence without affecting the magnetic isotropic nature of the nanocrystalline samples. A stress relief treatment performed on magnetic-field annealed samples can result in 15% increase of the remanent ratio. Investigations on intergrain magnetic interactions via δM plot analysis are presented. (orig.)Primary Subject

Source

Schultz, L.; Mueller, K.H. (eds.); Werkstoff-Informationsgesellschaft mbH, Frankfurt am Main (Germany); 334 p; ISBN 3-88355-267-4; ; 1998; p. 75-82; 10. international symposium on magnetic anisotropy and coercivity in rare-earth transition metal alloys; Dresden (Germany); 4 Sep 1998; Available from TIB Hannover; 6 refs.

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AbstractAbstract

[en] A simple and easily implemented highly accurate method to compute the scattering length and effective range for a diatomic potential is presented. It combines the numerical solution for small internuclear distances R with analytical corrections for large R. The method provides upper and lower limits to the exact values, to any desired precision. A numerical example and discussion are given for the case of the Cs-Cs ground-state interaction

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[en] The knowledge of the long-range interaction between atoms and molecules is of fundamental importance for low-energy and low-temperature collisions. The electrostatic interaction between the charge distributions of two ground-state alkali-metal atoms can be expanded in powers of 1/R, the internuclear distance. The coefficients corresponding to the expansion powers of R

^{-6}, R^{-8}, and R^{-10}are calculated exactly using a numerical technique originally developed for determining resonance profile near an absorption line. These coefficients are evaluated by integrating the dynamic electric multipole polarizabilities at imaginary frequencies which are in turn obtained by solving two coupled inhomogeneous differential equations. Highly accurate one-electron model potentials are developed to represent the motion of the valence electron in the field of the closed alkali positive ion core. The numerical results for the constants C_{6}, C_{8}, and C_{10}for the homo- and hetero-nuclear alkai diatoms are compared with other calculationsPrimary Subject

Source

1993 American Physical Society annual meeting on atomic, molecular, and topical physics; Reno, NV (United States); 16-19 May 1993; CONF-9305421--

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[en] We study long-range diagonal adiabatic corrections to the interaction potentials of the ground state of homonuclear alkali-metal dimers. We show that in the long-range limit the diagonal adiabatic matrix elements may be expressed as a series of inverse powers of the internuclear distance. Each of the nonzero coefficients of this expansion is a mass-dependent correction term to the dispersion coefficients. They are computed by using a complex integral representation, that transforms the molecular problem into an atomic one. Numerical results are presented. copyright 1998 The American Physical Society

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AbstractAbstract

[en] We calculate the excitation rates of the 5

^{2}D_{3/2}and 5^{2}D_{5/2}states of rubidium through the simultaneous absorption of two photons of different frequencies by the ground 5^{2}S_{1/2}state. We include spin-orbit effects in the contribution of the 5P and 6P states, situated between the initial and final states, which give rise to the resonance structure in the two-photon spectrum. We indicate how our results can be used for the case in which the transition takes place between states with specified total angular momenta F, for both^{85}Rb and^{87}Rb. For the case of counterpropagating photons with the same frequency, our results are compared with existing experimental dataPrimary Subject

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[en] The subthreshold fission probabilities of the

^{236},^{239}U isotopes induced by (d.pf) reactions were measured. The experimental fission barrier is compared with the theoretical one computed in the two-center shell model. By including the dynamical and specialization effects the agreement of the theoretical predictions with the experimental results is good. (author)Primary Subject

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Revue Roumaine de Physique; ISSN 0035-4090; ; v. 23(5); p. 527-534

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