Demiryolu sistemlerinde kullan?lan elektrikli trenlerin hareket gücünü sa?lamak için motor sürücülerini cer transformatörleri beslemektedir. Cer lokomotiflerin alt?nda veya üstünde, boyutlar? s?n?rl? bir alana yerle?tirilmektedir. Bunun yan?nda tren kullan?lmakta olan ekipmanlar?n güç ihtiyaçlar?n? kar??layabilmek farkl? gerilim seviyelerinde çok say?da sarg? yap?lar? transformatörlerinde bulun...

s Some zirconia foams are used as heating elemeht in electrical furnaces. Their creep behaviour has been investigated at high temperature and under low stress. Important visco-elastic behaviour has been observed. It is likely due to recrystallization, which is sensitive to the tetragonal-cubic phase transition and to the stress. I INTRODUCTION Porous and dense zirconia based ceramics have been ...

Aalto University, P.O. Box 11000, FI-00076 Aalto www.aalto.fi Author Matti Leinonen Name of the doctoral dissertation On applying stochastic Galerkin finite element method to electrical impedance tomography Publisher School of Science Unit Department of Mathematics and Systems Analysis Series Aalto University publication series DOCTORAL DISSERTATIONS 135/2015 Field of research Mathematics Manus...

The gas-solid-liquid three-phase flow is a very complicated flow pattern in pipeline transportation. By using electrical capacitance tomography (ETC) it can acquire the permittivity distribution of the multi-phase. The sensitivity distribution in ETC may affect the analysis of the permittivity distribution of the multi-phase. However, very limited work has been done in this issue. In order to i...

Studying the dynamic response of Francis turbine runners is of paramount importance in order to avoid resonance problems during operating conditions. For this purpose, the natural frequencies as well as their associated mode-shapes and damping ratios of the runner have to be determined. In this paper, an Experimental Modal Analysis (EMA) of the runner of a Francis turbine prototype has been per...