The Structure and the Distance of Collinder 121 from Hipparcos and Photometry: Resolving the Discrepancy

We present further arguments that the Hipparcos parallaxes for some of the clusters and associations represented in the Hipparcos catalog should be used with caution in the study of the Galactic structure. It has been already shown that the discrepancy between the Hipparcos and ground based parallaxes for several clusters including the Pleiades, Coma Ber and NGC 6231 can be resolved by recomputing the Hipparcos astrometric solutions with an improved algorithm diminishing correlated errors in the attitude parameters. Here we present new parallaxes obtained with this algorithm for another group of stars with discrepant data - the galactic cluster Cr 121. The original Hipparcos parallaxes led de Zeeuw et al. to conclude that Cr 121 and the surrounding association of OB stars form a relatively compact and coherent moving group at a distance of 550 -- 600 pc. Our corrected parallaxes reveal a different spatial distribution of young stellar populace in this area. Both the cluster Cr 121 and the extended OB association are considerably more distant (750 -- 1000 pc), and the latter has a large depth probably extending beyond 1 kpc. Therefore, not only are the recalculated parallaxes in complete agreement with the photometric uvbybeta parallaxes, but the structure of the field they reveal is no longer in discrepancy with that found by the photometric method.Comment: 7 pages, 1 figure, ApJL accepte

Superintegrable models of Winternitz type

A general procedure is outlined which allows one to construct superintegrable models of Winternitz type. Some examples are presented.Comment: 6 pages, LaTeX; To appear in Phys. Lett.

A Study of the Mechanism of Action of Zervamicin IIB Peptide Antibiotic by Molecular Dynamics Simulation

We model mechanism of action of a channel-forming peptide antibiotic, zervamicin IIB, by molecular dynamics (MD) simulation. Interaction of this peptide with neutral and negatively charged lipid bilayers is investigated. It is found that charge of membrane surface influences the orientation of zervamicin IIB molecule, that may in turn effect its permeation into the membrane. On this basis we propose modifications to ZrvIIB structure that may increase its affinity towards the prokaryotic cellular membrane. Zervamicin IIB transmembrane channels are modeled as bundles consisting of 4, 5 and 6 individual peptide monomers. Our results suggest that four monomers don’t form a stable water-filled ion channel. Thus the channel with the least number of monomers (and the lowest conductance level by literature data) is a pentamer

Modeling of a Torch and Calculations of Heat Transfer in Furnaces, Fire Boxes, Combustion Chambers Part II. Calculations of Radiation from Gas Volumes by the Laws of Radiation from Cylinder Gas Volumes

On the basis of scientific discovery the major scientific problem is solved, analytical expressions, formulas for calculation heat radiation from gas volumes, torches on the heating surfaces are obtained. The example of calculation of radiation fluxes from torch on the heating surface is given. Scientific discovery allows designers from many countries worldwide to create new and improved the operating torch heating furnaces, steam boiler boxes, combustion chambers of gas-turbine installations of power stations

Modeling of a Torch and Calculations of Heat Transfer in Furnaces, Fire Boxes, Combustion Chambers. Part I. Calculations of Radiation from Solids and Gas Volumes by the Laws of Radiation from Solid Bodies

Through the 20th century scientists, researches made many attempts to solve important complex scientific problem. The solution to the problem was to derive analytical expressions, formulas for calculating heat radiation from gas volumes, torches on heating surfaces. However, the formulas were not derived in the 20 th century. At the beginning of the 21st century the author of this article disclosed the laws for heat radiation from cylinder gas volumes. On the basis of the scientific disclosure the problem was solved, analytical equations for calculating heat transfer in torch furnaces, steam boiler boxes, combustion chambers of gas-turbine installations were obtained. To assess the scientific disclosure and its present and future roles, the analysis of methods for calculating heat transfer in furnaces, fire boxes, combustion chambers was performed