The external magnetic field effect on the relaxation M$\stackrel{..}{o}$ssbauer spectra of small particles
The external magnetic field effect on the relaxation M$\stackrel{..}{o}$ssbauer spectra of small particles
V.I. Nikolaev, T.A. Bushina
Transformations of the small particle Mossbauer spectra under the paramagnetism-induced superparamagnetism phase transition induced by the applied magnetic field are considered. The magnetic properties of an ensemble of small particles near the Curie point are described using the molecular field theory combined with the Langevin model. Relaxation absorption curves have been numerically simulated with the use of the two-level model. The suggestion is made that the appearance of characteristic relaxation "wings" in the M$\stackrel{..}{o}$ssbauer spectra may be an evidence of the transition of particles into the state of induced superparamagnetism.
Show AbstractA berthollide phase in the Pd-Lu system
A berthollide phase in the Pd-Lu system
A.S. Ilyushin$^1$, N.A. Khatanova$^1$, E.A. Rykova$^1$, Tsetsgeegiin Otgontuul$^2$
The X-ray and microhardness data on palladium-lutetium alloys containing $35$; $40,\!06$; $44,\!5$, and $45,\!7$ at.% Lu showed that, after annealing at $1000$$^о$C for $4$ h, the alloys contained not only the Pd$_3$Lu, Pd$_4$Lu$_3$, and PdLu equilibrium intermetallic compounds but also a variable-composition X-phase with a hexagonal lattice and the $c/a$ ratio ranging from 0.45 to 0.52. The X-phase occurs in a wide concentration range in the Pd-Lu system and can therefore be classified with intermetallic compounds of a special type called berthollides according to N.S. Kurnakov.
Show AbstractEnergy balance in the wind-wave system during the initial stage of wind wave generation
Energy balance in the wind-wave system during the initial stage of wind wave generation
E.P. Anisimova, K.V. Pokazeev, N.I. Soboleva, A.A. Speranskaya
The components making up the wave energy balance equation for the initial stage of wind wave generation have been found. The data measured by these authors and taken from the available literature are used. A refined estimate of the energy coming from the wind fl.ow to the waves by the normal pressure mechanism is proposed.
Show AbstractThe multipath propagation effect on the accuracy of the media parameter profile reconstruction in the radio occultation experiments
The multipath propagation effect on the accuracy of the media parameter profile reconstruction in the radio occultation experiments
V.I. Zakharov, V.E. Kunitsyn
It is shown that multipath occurrence in complicated cases of satellite-to-satellite signal passage introduces additional distortions into reconstructed media parameter profiles. Separating the rays by their arrival times allows one to reliably discard the beam reflected by the Earth. The multipath propagation effect is local and depends on the experiment geometry. For electron concentration profiles, the range of errors associated with multipath propagation does not exceed 10-12%. It is interesting that the error manifestation regions are restricted in altitude and can be interpreted as wave structures.
Show AbstractOn the nature of hard X-ray radiation in solar corona during a flare
On the nature of hard X-ray radiation in solar corona during a flare
S.A. Bogachev, B.V. Somov
It is shown that the coronal source of hard X-ray radiation of a solar flare is produced in the collision of the plasma stream from a reconnecting current layer with a magnetic obstacle. The accumulation of reconnected magnetic flux behind the wave front explains the observed source motion velocity.
Show AbstractCoulomb excitation of polyatomic organic molecules in their slow surface sliding
Coulomb excitation of polyatomic organic molecules in their slow surface sliding
E.D. Aleksanova$^1$, V.V. Komarov$^1$, A.M. Popova$^1$, H. Jungclas$^2$
It is demonstrated that when polyatomic molecules having substructures in the form of unidimensional chains of two-atom dipoles slide over a surface with velocities below the Bohr velocity, collective vibrational excitations {excimoles) develop therein. An analytical expression for the probability of excitation of $k$ excimoles in a chain containing $m$ dipoles, which depends on the sliding velocity and the molecular and the surface parameters, is obtained.
Show AbstractThe charged $W$-boson propagator in an electromagnetic field in the generalized $R_{\xi}$-gauge
The charged $W$-boson propagator in an electromagnetic field in the generalized $R_{\xi}$-gauge
A.M. Egorov, A.I. Studenikin
An exact solution of the equation for the $W$-boson propagator in the generalized $R_\xi$-gauge with consideration for the action of a crossed electromagnetic field has been found. The obtained general expression is consistent with the known result for the propagator in the absence of electromagnetic field, as well as with that in its presence in the cases of the unitary and Feynman gauges. The principle importance of the use of the $W$-boson propagator in the $R_{\xi}$-gauge in studying corresponding loop processes in electromagnetic field is discussed.
Show AbstractThe problem of measurement interpretation for a fuzzy model of an experiment
The problem of measurement interpretation for a fuzzy model of an experiment
T.V. Matveeva, Yu.P. Pyt'ev
The effect of a priori fuzziness of the model experiment on the measurement interpretation fuzziness is demonstrated.
Show AbstractInvestigation of thermomechanical processes in strongly inhomogeneous media with the use of numerical-analytic procedures
Investigation of thermomechanical processes in strongly inhomogeneous media with the use of numerical-analytic procedures
A.B. Knyazev, G.N. Medvedev, B.I. Morgunov
Mathematical models of thermomechanical processes in strongly inhomogeneous media are considered. An iteration procedure for determining the asymptotic expansion coefficients of thermoelasticity equations is described.
Show AbstractThe sweep method application to calculating the reflection coefficients and determining the field structure in the inhomogeneous absorbing ionosphere
The sweep method application to calculating the reflection coefficients and determining the field structure in the inhomogeneous absorbing ionosphere
V.D. Gusev, E.G. Mikhailova, L.I. Prikhod'ko
Algorithms for calculating the complex coefficients of reflection and finding the field structure in an inhomogeneous medium with a high-altitude effectivefrequency profile of electron collisions are proposed. The employed sweep method makes it possible to consider the cases of both partial and almost complete reflection of waves from the layer and to find the frequency dependence of the coefficient of reflection.
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