Results 71 to 80 of about 221,434 (164)

Mathematical properties of formulations of the gas transmission problem

open access: yesTehnički Glasnik, 2017
The paper presents the mathematical properties of several formulations for the gas transmission problem that account for the nonlinear flow pressure relations.
Daniel De Wolf
doaj  

MATHEMATICAL PROPERTIES OF THE GOLDEN RATIO – A FASCINATING NUMBER

open access: yesJournal of Industrial Design and Engineering Graphics, 2013
The Golden Ratio appears in many situations: in geometry, in lists with special numbers drawn up by mathematicians, in art history lectures, in rose petals arrangement or spiral shells of mollusks. This paper presents definitions and algebraic properties
DOBRE Daniel
doaj  

Frequency Properties Research of Elevator Drive System with Direct Torque Control-Pulse with Modulation

open access: yesИзвестия высших учебных заведений и энергетических объединенний СНГ: Энергетика, 2008
In the article problems of frequency properties research for electric drive system with direct torque control and pulse width modulator are described. The mathematical description of elevator is present.
A. S. Koval, A. V. Shvayakov
doaj  

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