Wyniki wyszukiwania - BazTech

Ograniczanie wyników

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Sortuj według:

Ogranicz wyniki do:

Electrodeposition of silver-indium alloys from non-cyanide electrolytes

Dimitrova N., Dobrovolska T., Krastev I.

Archives of Metallurgy and Materials

2013

Vol. 58, iss. 1

255-260

Non-cyanide electrolytes for silver-indium alloys deposition investigated in order to adjust electrolysis conditions thus to observe the formation of spatio-temporal structures onto the electrode surface. It was established that the electrolytes for silver-indium deposition prepared with the excess of thiocyanate and iodide complexing agents are stable in time. The alloy electrodeposition is of a regular type where the silver is the more positive metal. The observed oscillations of the potential during galvanostatic deposition of indium in the thiocyanate solution are suggested to appears due to the formation/destruction of some passive layers on the electrode surface. Spatio-temporal structures could be observed during electrodeposition of the alloy from thiocyanate electrolytes.

Badano bezcyjankowe elektrolity do osadzania stopów srebrowo-indowych. Celem badań była optymalizacja procesu osadzania oraz obserwacja tworzenia się spiralnych struktur na powierzchni elektrody. Wykazano, że elektrolity do osadzania stopów Ag-In zawierające nadmiar rodanków i jodków jako czynników kompleksujacych były stabilne. Obserwowane oscylacje potencjału w czasie galwanostatycznego osadzania indu z elektrolitów rodankowych wskazują na tworzenie i roztwarzanie się warstewek pasywnych na powierzchni elektrody. Obserwowano spiralne struktury w czasie osadzania stopu z elektrolitów rodankowych.

Nonlinear stabilizing control of an uncertain bioprocess model

Dimitrova N., Krastanov M.

International Journal of Applied Mathematics and Computer Science

2009

Vol. 19, no 3

441-454

In this paper we consider a nonlinear model of a biological wastewater treatment process, based on two microbial populations and two substrates. The model, described by a four-dimensional dynamic system, is known to be practically verified and reliable. First we study the equilibrium points of the open-loop system, their stability and local bifurcations with respect to the control variable. Further we propose a feedback control law for asymptotic stabilization of the closed-loop system towards a previously chosen operating point. A numerical extremum seeking algorithm is designed to stabilize the dynamics towards the maximum methane output flow rate in the presence of coefficient uncertainties. Computer simulations in Maple are reported to illustrate the theoretical results.