Entity

Time filter

Source Type


Morega A.M.,Polytechnic University of Bucharest | Morega A.M.,Institute of Statistical Mathematics and Applied Mathematics | Savastru C.,Polytechnic University of Bucharest | Morega M.,Polytechnic University of Bucharest
2013 E-Health and Bioengineering Conference, EHB 2013 | Year: 2013

The aim of this study is three fold: (1) to investigate the pulsatile blood flow in the brachial artery and its ulnar and radial tributaries in the attempt to understand aspects related to blood pressure measurements (BPM); (2) to assess the flow-vessel-muscle structural interactions that may occur normally and under occlusive constraints (the radial artery); (3) to investigate the BPM information for different rheological models of blood. Mathematical modeling and numerical simulations are used to solve these objectives. © 2013 IEEE. Source


Morega A.M.,Polytechnic University of Bucharest | Morega A.M.,Institute of Statistical Mathematics and Applied Mathematics | Robello G.,University of Valladolid | Morega M.,Polytechnic University of Bucharest
2015 9th International Symposium on Advanced Topics in Electrical Engineering, ATEE 2015 | Year: 2015

This paper presents mathematical modeling and numerical simulation results that are part of a study concerning the dynamics of the stator of piezoelectric (PZ) traveling wave (TW) rotating ultrasonic motor. The stator is a PZ composite ring, and the rotor is a metallic ring. The rotational torque is produced by exciting the stator into a flexural traveling wave, transmitted to the rotor through the stator-rotor friction. A modal analysis provides for the structural eigenfrequencies of the stator. When the AC powering stage providing for two voltages of same amplitude and shifted in quadrature is adapted to a frequency close to the flexural resonance of the stator, the TW reaches higher amplitudes that result in higher rotational velocities because the rotor speed is proportional to the stator TW amplitude. © 2015 IEEE. Source


Morega A.M.,Polytechnic University of Bucharest | Morega A.M.,Institute of Statistical Mathematics and Applied Mathematics | Morega M.,Polytechnic University of Bucharest | Ilie C.,Romanian National Institute for Research and Development in Electrical Engineering
2015 9th International Symposium on Advanced Topics in Electrical Engineering, ATEE 2015 | Year: 2015

This paper presents a bending-mode cantilever actuator (CA) concept for optical devices. Two designs are analyzed in stationary working conditions through numerical simulations, and their deformations under the action of electrodynamic body forces are evaluated. The modal structural analysis and the lumped, electric circuit parameters are also provided. These results may be of interest in the design stage of these CAs. © 2015 IEEE. Source


Morega A.M.,Polytechnic University of Bucharest | Morega A.M.,Institute of Statistical Mathematics and Applied Mathematics | Stoica V.,Romanian National Institute for Research and Development in Electrical Engineering | Morega M.,Polytechnic University of Bucharest | Dobrin I.,Romanian National Institute for Research and Development in Electrical Engineering
2015 9th International Symposium on Advanced Topics in Electrical Engineering, ATEE 2015 | Year: 2015

This paper presents a new active electronic protection system that keeps a high temperature superconductor (HTS) coil that is in superconductive state from shifting into normal conduction state (quench). The coil is made of YBCO tape high temperature superconductor, with a critical temperature of 92 K. The superconducting coil is confined to a cryostat, which is vacuumed at about 0.001 mbar to minimize the heat transfer influx. The cryogenic agent, in which the coil is immersed, is liquid nitrogen, such that the working temperature of the HTS coil is about 77 K. The quench protection system is composed of an electronic quench protection and signal processing system, a power electronic module, and a stabilized voltage power supply, described in the paper. © 2015 IEEE. Source


Morega M.,Polytechnic University of Bucharest | Morega A.M.,Polytechnic University of Bucharest | Morega A.M.,Institute of Statistical Mathematics and Applied Mathematics | Sandoiu A.,Polytechnic University of Bucharest
2015 9th International Symposium on Advanced Topics in Electrical Engineering, ATEE 2015 | Year: 2015

Hyperthermia for medical applications represents the moderate heating of human body tissue, commonly under the tolerance limit of 45°C, for the inhibition of cancerous cells growth. For our study, the heating is locally produced in soft tissue with an interstitial microwave applicator. Several aspects usually considered for the optimization of applicator's design and the assessment of model sensitivity to various parameters are examined in this paper by numerical simulation. The numerical model that combines the electromagnetic and heat transfer problems is based on the finite element method and it was validated by previous research. © 2015 IEEE. Source

Discover hidden collaborations