Entity

Time filter

Source Type


Demin A.M.,St. Petersburg State University of Architecture and Civil Engineering
Glass Physics and Chemistry | Year: 2013

The suggested method allows for the calculation of a temperature dependence of the density, thermal conductivity, and specific thermal capacity of a raw briquet (from glass powder) during preheating in the course of foam glass production. The properties of the raw briquet were determined based on the structure and chemical composition of the raw material (glass). The resulting dependences can be used to solve the problems of heat-mass exchange. © 2013 Pleiades Publishing, Ltd. Source


Velichko T.I.,St. Petersburg State University of Architecture and Civil Engineering | Mikhailenko S.N.,Zuev Institute of Atmospheric Optics | Tashkun S.A.,Zuev Institute of Atmospheric Optics
Journal of Quantitative Spectroscopy and Radiative Transfer | Year: 2012

A set of mass-independent U mj and Δ mj parameters globally describing vibration-rotation energy levels of the CO molecule in the X 1σ + ground electronic state was fitted to more than 19,000 transitions of 12C 16O, 13C 16O, 14C 16O, 12C 17O, 13C 17O, 12C 18O, and 13C 18O isotopologues collected from the literature. The maximal values of the vibrational V and the rotational J quantum numbers included in the fit was 41 and 128, respectively. The weighted standard deviation of the fit is 66. Fitted parameters were used for calculation of Dunham coefficients Y mj for nine isotopologues 12C 16O, 13C 16O, 14C 16O, 12C 17O, 13C 17O, 14C 17O, 12C 18O, 13C 18O, and 14C 18O. Calculated transition frequencies based on the fitted parameters were compared with previously reported. A critical analysis of the CO HITRAN and HITEMP data is also presented. © 2012 Elsevier Ltd. Source


Semenov A.A.,St. Petersburg State University of Architecture and Civil Engineering
Thin-Walled Structures | Year: 2016

The article presents a methodology for the study of shell structure strength and stability. The basis of the study is a geometrically nonlinear mathematical model, which takes into account the transverse shifts and orthotropy of material. The model is presented in dimensionless parameters in the form of the total energy potential functional and can be used for different types of shells of revolution. The model is studied by using an algorithm based on the Ritz method and the method of solution continuation according to the best parameter (MSCBP), which allows for obtaining the values of the upper and lower critical loads and examining the supercritical behavior of designs. In accordance with an algorithm, the computer program has been developed and a comprehensive study of the strength and stability of shallow shells (which are square in plane), cylindrical, and conical panels has been explored. The load loss of strength and buckling load values have been obtained, and their relationship to one another has been demonstrated. © 2016 Elsevier Ltd. All rights reserved. Source


Tashkun S.A.,Zuev Institute of Atmospheric Optics | Velichko T.I.,St. Petersburg State University of Architecture and Civil Engineering | Mikhailenko S.N.,Zuev Institute of Atmospheric Optics
Journal of Quantitative Spectroscopy and Radiative Transfer | Year: 2010

All available transitions from microwave to visible region (3.8-10440cm-1) of the 12C16O molecule were collected from the literature and tested using the RITZ computer code. These data have been critically analyzed and used to obtain the most complete and precise set of 2247 experimental energy levels of this molecule covering the 0-67000cm-1 interval. These levels together with calculated correlation matrix can be used to generate the most precise list of transitions with confidence intervals for astrophysical and atmospheric applications. Comparisons with the HITRAN and GEISA databanks as well as with Goorvitch high-temperature linelist are discussed. A set of corrected HITRAN 12C16O transition frequencies together with 99% confidence intervals is presented; it is proposed that this should be employed as a replacement for the current HITRAN database. © 2010 Elsevier Ltd. Source


Balandin D.V.,Novgorod State University | Kogan M.M.,St. Petersburg State University of Architecture and Civil Engineering
Automation and Remote Control | Year: 2011

In the framework of the method of invariant ellipsoids, for a linear dynamic object a suboptimal linear dynamic controller by output is synthesized, at which the upper estimate of a maximum value of the norm of the controllable output reaches a minimum at all initial states of a system from a certain domain and at any disturbances bounded by the norm. © 2011 Pleiades Publishing, Ltd. Source

Discover hidden collaborations