2,277 research outputs found
Wave Functions and Energy Terms of the SCHR\"Odinger Equation with Two-Center Coulomb Plus Harmonic Oscillator Potential
Schr\"odinger equation for two center Coulomb plus harmonic oscillator
potential is solved by the method of ethalon equation at large intercenter
separations. Asymptotical expansions for energy term and wave function are
obtained in the analytical form.Comment: 4 pages, no figures, LaTeX, submitted to PR
Relativistic dynamical polarizability of hydrogen-like atoms
Using the operator representation of the Dirac Coulomb Green function the
analytical method in perturbation theory is employed in obtaining solutions of
the Dirac equation for a hydrogen-like atom in a time-dependent electric field.
The relativistic dynamical polarizability of hydrogen-like atoms is calculated
and analysed.Comment: 15 pages, 3 figures (not included, but hard copies are available upon
request
Spectra of Doubly Heavy Quark Baryons
Baryons containing two heavy quarks are treated in the Born-Oppenheimer
approximation. Schr\"odinger equation for two center Coulomb plus harmonic
oscillator potential is solved by the method of ethalon equation at large
intercenter separations. Asymptotical expansions for energy term and wave
function are obtained in the analytical form. Using those formulas, the energy
spectra of doubly heavy baryons with various quark compositions are calculated
analytically.Comment: 19 pages, latex2e, published at PRC61(2000)04520
Assessing Caries Removal by Undergraduate Dental Students Using Quantitative Light-Induced Fluorescence
The reaction cross section
The one- and two-step mechanisms of the reaction in
the range of incident proton kinetic energy 1.13-3.0 GeV have been
investigated. A remarkable peculiarity of the two-step mechanism which
incorporates subprocesses and is the so
called velocity matching providing the presence of all intermediate particles
nearly to the on-mass-shell. The differential cross section has been calculated
using a realistic model for the hypertritium wave function. The
maximum value of the cross section is estimated as 1nb/sr. The
contribution of the one-step mechanism with the elementary process into the cross section has been found to be two - three orders of
magnitude smaller in comparison with the two-step mechanism.Comment: 10 pages, Latex, 3 Postscript figure
On integrable system on with the second integral quartic in the momenta
We consider integrable system on the sphere with an additional integral
of fourth order in the momenta. At the special values of parameters this system
coincides with the Kowalevski-Goryachev-Chaplygin system.Comment: LaTeX, 6 page
Operator method in solving non-linear equations of the Hartree-Fock type
The operator method is used to construct the solutions of the problem of the
polaron in the strong coupling limit and of the helium atom on the basis of the
Hartree-Fock equation. is obtained for the polaron
ground-state energy. Energies for 2s- and 3s-states are also calculated. The
other excited states are briefly discussed.Comment: 7 page
X-ray sources of nanosecond pulses based on semiconductor opening switch for CT
This study describes the development of prototype CT scanners with 2 different pulsed X-ray sources. X-ray sources used in this work have a semiconductor opening switch. It is used to generate high voltage pulses and provides pulse repetition frequency up to 5 kHz. The work uses two pulsed X-ray sources, which have different peak voltages and pulse energies. Tomographic sections and 3D images for test objects are obtained, the advantages of pulsed X-ray sources compared to continuous sources are discussed. © 2020 American Institute of Physics Inc.. All rights reserved.he research is supported by the Russian Science Foundation (RSF), grant № 18-79-00020
CARE TO PATIENTS WITH PRIOR STROKE
The paper discusses the topical problem how to organize health care to patients with cerebrovascular diseases (nursing, social adaptation, rehabilitation) with the direct participation of their relatives. For this, in 2006 the All-Russian Public Organization TSociety of Relatives of Stroke PatientsU (SRSP) was set up under the aegis of the National Stroke Control Association, which involves schools for the relatives of stroke patients. The major aspects and lines of SRSP activities are described in this paper
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