357 research outputs found
The packing density and the coordination number of regular spherical packing
The article shows the receiving of density equation of regular spherical packing functioning as an effective coordination number and dimension of space on the basis of six-dimensional physical space determinatio
Doubly differential cross sections for ionization of lithium atom by protons and O ions
We consider single ionization of lithium atom in collisions with and
O projectiles. Doubly differential cross sections for ionization are
calculated within a relativistic non-perturbative approach. Comparisons with
the recent measurements and theoretical predictions are made.Comment: Submitted to the Topical Issue of Eur. Phys. J. D based on the
contributions reported on the International Conference on Many Particle
Spectroscopy of Atoms, Molecules, Clusters and Surfaces (MPS 2018), Budapest,
Hungary, 21-24 August 201
Spontaneous decay of excited atomic states near a carbon nanotube
Spontaneous decay process of an excited atom placed inside or outside (near
the surface) a carbon nanotube is analyzed. Calculations have been performed
for various achiral nanotubes. The effect of the nanotube surface has been
demonstrated to dramatically increase the atomic spontaneous decay rate -- by 6
to 7 orders of magnitude compared with that of the same atom in vacuum. Such an
increase is associated with the nonradiative decay via surface excitations in
the nanotube.Comment: 8 pages, 3 figure
Chemical analysis of aerosol in the Venusian cloud layer by reaction gas chromatography on board the Vega landers
The experiment on sulfuric acid aerosol determination in the Venusian cloud layer on board the Vega landers is described. An average content of sulfuric acid of approximately 1 mg/cu m was found for the samples taken from the atmosphere at heights from 63 to 48 km and analyzed with the SIGMA-3 chromatograph. Sulfur dioxide (SO2) was revealed in the gaseous sample at the height of 48 km. From the experimental results and blank run measurements, a suggestion is made that the Venusian cloud layer aerosol consists of more complicated particles than the sulfuric acid water solution does
Computer modelling of material objects’ structure : Part II. Elementary particles
Based on the previously presented model of space-time, the structural features of elementary particles formation are considered. The paper investigates the model of elementary particles formation composed of such fundamental particles as loveton, electron, neutrino, and their antiparticle
Computer modelling of material objects’ structure. Part III. Clustering of nucleon systems
The structure of light atomic nuclei, such as hydrogen, helium and lithium nuclides, was studied based on the cluster approach. Atomic nuclei are formed as systems consisting of free and bound lovetons, as well as neutron electrons and electron-positron pairs. The work focuses on the mass of the atomic nucleus and its binding energy as the main basic characteristic
Computer visualization of the spatial structure of the electronic atom shell
This paper presents an approach that allows describing the spatial formation of the electron shells of atoms, based on known principles and rules, in a logically consistent version of the visual representation of an ato
Symbolic-numeric approach for solving linear differential equations of the fourth order
This paper presents a symbolic-numeric approach for solving linear differential equations of the fourth order in the form of generalized power series. The working program allows to find solutions to differential equations of the fourth order in the form of power series, generally, of any order, but is limited by capabilities of a given computer. Some examples of solving differential equations of the fourth order are presented, which show the efficiency of the developed progra
Simulation of the coordination number of random sphere packing
Given article presents a generalized equation for calculating the average coordination
number from the density of a random sphere packing, supplemented by a dependence on the threshold value of the interparticle distance in two- and three-dimensional spaces. It is shown that the calculation of the average coordination numbers according to the proposed equation gives an unambiguous correspondence between the simulated, calculated and experimental data for threshold values of more than 1.02 particle diameters. An explanation of the weak dependence of the average coordinate number on the packing density for small threshold values of the interparticle distance is given in this wor
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