Normality in the space of subgroups of a lie group

It is proved that a connected Lie group is solvable if and only if the space of closed subgroups of this group is normal in the Vietoris topology and any compact segment of subgroups lying in this space is countable.Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 42, No. 6, pp. 786–788, June, 1990.     

Proton distribution at low altitudes in near-equatorial latitudes according to satellite experiments: The dynamics of proton fluxes

The data obtained on the ACTIVE, SAMPEX, and TIROS-N satellites are used to study the dynamics of low-energy (from tens of keV to several MeV) proton fluxes in the region of the geomagnetic equator (L < 1.15) at low altitudes (up to 1000 km). The dependence of the fluxes on the local magnetic time is presented. A number of magnetic disturbances in November–December 1978 are analyzed to illustrate the dependence of the flux on the geomagnetic activity level. The results obtained allow the conclusion that the ring current is one of the main sources of protons at low altitudes in near-equatorial latitudes.     

Specific features of the distribution of protons at small altitudes in near-equatorial latitudes according to data of satellite experiments. I. Energy spectrum

The spectra of protons with energies from 10 keV to 1 MeV as measured in experiments conducted at satellites and the MIR orbital station are presented. These data were obtained in the area of the geomagnetic equator at L < 1.15 and at altitudes up to 1000 km. The proton spectrum was determined during periods of geomagnetic perturbations and quite periods. These spectra were approximated using a kappa-function. The proton spectra in the near-equatorial area and in the ring current are compared. The proton’s life time in the near-equatorial area is estimated, taking into account charge exchange and Coulomb scattering. It is confirmed that the ring current is a main source of protons in the near-equatorial area at low altitudes.     

Producing valuable products from industrial and household wastes using autoclave thermovaporous treatment

Abstract

The autoclave thermo vaporous treatment in water-vapour media allows to obtain useful products from different industrial and household wastes: the silica and hexafluorosilicium acid - collateral product by manufacture of mineral fertilizers; aluminium hydroxide - by-product of aluminium designs and of electrolytical condensers manufacture; household wastes, containing cellulose; product and film from plastic.     

Photo- and cathodoluminescence of the cetylpyridinium chloride: ZnO nanocomposites

The cathodoluminescence and photoluminescence (PL) spectra of ZnO nanoparticles (NPs) embedded into the cetylpyridinium chloride (CPCL) matrix were studied. The composites were obtained by drying an aqueous suspension of CPCL and ZnO NPs, with NaCl and with NaOH additives. We observed that only NaOH addition lead to a significant increase in the PL intensity which we attribute to the surface chemistry of the ZnO NPs. We propose that thin ZnOH₂ and Na₂ZnO₂ layers form on the surface of the NPs; these layers present an increased number of oxygen vacancies, which act as emitting centres.     

On the Study of the Basic Design Parameters of a Seven-Link Spatial Mechanism of a Part Processing Machine

International Applied Mechanics - A design of a spatial seven-link mechanism with rotational kinematic pairs of a part processing machine without redundant constraints is presented. The principle...     

Profile Monitor for Electron Beam in the High-Voltage Electron Cooling System of the COSY Synchrotron

Technical Physics - A high-voltage system for electron cooling of the COSY (Germany) synchrotron is featured by the presence of a profile monitor that is used for measurement of current density...     

Tunka-133: Status 2008 and development of methods for data analysis

The activity on creation of a array with an area of 1 km² for recording extensive air showers using Cherenkov light began in the Tunka valley in 2006. The new array will allow one to study cosmic rays in the energy range 10¹⁵–10¹⁸ eV by the unified method. In the winter of 2007–2008, the array operated with 4 clusters, 7 detectors in each cluster. Experimental data obtained during 270 h of fair weather in moonless nights demonstrated unique capabilities of the new array, related with the possibility of recording the pulse shape with a step of 5 ns from each detector.