616 research outputs found
Mass Shift of Axion in Magnetic Field
A mass-shift of the axion propagating in an external constant homogenious
magnetic field is calculated. The contributions via an electron loop and a
virtual photon are examined. It is shown that the virtual photon contribution
dominates substantially over the electron-loop one. Under the conditions of the
early Universe the electron-loop contribution to the massless axion mass-shift
is equal to zero while the virtual photon contribution is finite and can be of
order of the recent restrictions on the axion mass.Comment: 4 pages, latex2e, 2 PS figures, uses ws-p8-50x6-00.sty (included) and
amssymb.sty. Talk at the International Workshop on Particle Physics and the
Early Universe (COSMO-99), Trieste, Italy, 27 September - 3 October 199
Double radiative decay in the Standard Model
Z-boson decay in the Standard Model is
analysed. The distribution function on the invariant masses of the photon and
fermion pairs is calculated in the leading logarithmic approximation. It is
shown that this distribution function has a specific shape of a ``crest''. (To
be published in Mod.Phys.Lett.A)Comment: 6 pages, LaTeX, (the figures are not included), Yaroslavl, Yaroslavl
State University preprint YARU-HE-94/0
Recent progress in the study of fission barriers in covariant density functional theory
Recent progress in the study of fission barriers of actinides and superheavy
nuclei within covariant density functional theory is overviewed.Comment: 10 pages, 5 figures. In press in International Journal of Modern
Physics
Improving the production structure of the enterprise taking into account organizational changes
Материалы XII Междунар. науч.-техн. конф. (науч. чтения, посвящ. П. О. Сухому), Гомель, 22–23 нояб. 2018 г
Microstructure and phase composition of cold Isostatically pressed and pressureless sintered silicon nitride
The microstructure and physical properties of new Y₂O₃ and Al₂O₃ oxide-doped silicon nitride ceramics fabricated by cold isostatic pressing and free sintering were investigated. The phase composition of produced material was also studied by X-ray diffraction at room and elevated temperature. The fabricated ceramics featured a microstructure of Si₅AlON₇ grains with a fine-grained α-Si₃N₄ with a small amount of Y₂SiAlON₅. Described ceramics is attractive for many high-temperature structural applications due to beneficial combination of fine-grained structure with improved mechanical properties and small weight los
Field-induced axion emission via process in plasma
The annihilation into axion is investigated in a plasma and
an external magnetic field. This process via a plasmon intermediate state has a
resonant character at a particular energy of the emitted axion. The emissivity
by is compared with the axion cyclotron emissivity.Comment: 8 pages, latex, 4 PS figure
Relativistic Energy Density Functional Description of Shape Transition in Superheavy Nuclei
Relativistic energy density functionals (REDF) provide a complete and
accurate, global description of nuclear structure phenomena. A modern
semi-empirical functional, adjusted to the nuclear matter equation of state and
to empirical masses of deformed nuclei, is applied to studies of shapes of
superheavy nuclei. The theoretical framework is tested in a comparison of
calculated masses, quadrupole deformations, and potential energy barriers to
available data on actinide isotopes. Self-consistent mean-field calculations
predict a variety of spherical, axial and triaxial shapes of long-lived
superheavy nuclei, and their alpha-decay energies and half-lives are compared
to data. A microscopic, REDF-based, quadrupole collective Hamiltonian model is
used to study the effect of explicit treatment of collective correlations in
the calculation of Q{\alpha} values and half-lives.Comment: 23 pages, 10 figure
Accuracy of one-dimensional collision integral in the rigid spheres approximation
The accuracy of calculation of spectral line shapes in one-dimensional
approximation is studied analytically in several limiting cases for arbitrary
collision kernel and numerically in the rigid spheres model. It is shown that
the deviation of the line profile is maximal in the center of the line in case
of large perturber mass and intermediate values of collision frequency. For
moderate masses of buffer molecules the error of one-dimensional approximation
is found not to exceed 5%.Comment: LaTeX, 24 pages, 8 figure
«The Image of the Enemy» in the Russian Empire during the Great War
The article analyzes the formation of “the image of the enemy” in the Russian society in
1914–1916 on the basis of periodical and non-periodical publications. The author focuses on the
relationship of information policy and its part in the military-political events in the world.
It displays the impact of media on mass consciousness. It is also noted that the formation of the
image of the enemy was productive in the army and among the population, but only during the
early years of the war.
In addition to newspapers and illustrated periodicals (“Lyetopis’ voyny”, “Velikaya voyna v
obrazakh i kartinkhakh”, “Ogonyok”, “Iskry”, “Neva”), brochures and books, published for
“propagandizing” the reader during the Great War were also used as materials for the article
- …