Results 41 to 50 of about 36,636,285 (336)
The International Study of Asthma and Allergies in Childhood (ISAAC) Phase Three: A global synthesis [PDF]
, 2013 This ISAAC Phase Three synthesis provides summarised information on the main findings of the study, regional tables and figures related to the prevalence and severity of current symptoms of asthma, rhinoconjunctivitis and eczema in the main regions of ...
Keil, U +7 more
core +1 more source
Energies, 2022 Field approaches are employed to develop a mathematical model of a power network section. The facility consists of two electric power subsystems described with ordinary differential equations and presented as concentrated parameter systems connected with
Andriy Chaban +3 more
doaj +1 more source
, 2013 The present work puts forward a new strategy to achieve group separation of light, middle, and heavy rare-earth ions by liquid–liquid–liquid three-phase systems.
N. Sui +5 more
semanticscholar +1 more source
Geometric Phase of Three-Level Systems in Interferometry [PDF]
Physical Review Letters, 2001 We present the first scheme for producing and measuring an Abelian geometric phase shift in a three-level system where states are invariant under a non-Abelian group. In contrast to existing experiments and proposals for experiments, based on U(1)-invariant states, our scheme geodesically evolves U(2)-invariant states in a four-dimensional SU(3)/U(2 ...
Sanders, Barry C. +3 more
openaire +3 more sources
District Heating System Optimisation: A Three-Phase Thermo-Hydraulic Linear Model
Energies, 2023 Investments in the development of the district heating system require a thorough analysis of the technical, economic, and legal aspects. Regarding the technical and economic context, a mathematical model of the district heating system has been proposed ...
Piotr Pałka +4 more
doaj +1 more source
Single-to-three phase induction motor sensorless drive system
Alexandria Engineering Journal, 2012 This paper presented a single to three-phase induction motor drive system to provide variable output voltage and frequency. The proposed drive system employs only six IGBT switches, which form the front-end rectifier and the output inverter for the one ...
Z.M.S. El-Barbary
doaj +1 more source
Fast and robust three-dimensional best path phase unwrapping algorithm [PDF]
, 2007 What we believe to be a novel three-dimensional (3D) phase unwrapping algorithm is proposed to unwrap 3D wrapped-phase volumes. It depends on a quality map to unwrap the most reliable voxels first and the least reliable voxels last.
Moore, Christopher J. +5 more
core +1 more source
Highly efficient three-phase grid-connected parallel inverter system
Journal of Modern Power Systems and Clean Energy, 2018 In this paper, a new three-phase grid-connected inverter system is proposed. The proposed system includes two inverters. The main inverter, which operates at a low switching frequency, transfers active power to the grid.
Evren ISEN, Ahmet Faruk BAKAN
doaj +1 more source
Effective Harmonic Cancellation Technique for a Three-Phase Four-Wire System
Energies, 2022 An excess non-linear and unbalanced load application increases the power quality (PQ) problem by injecting harmonic current. The avoidance of neutral current control creates additional PQ problems due to excess circulating current in modern 3φ4W ...
Buddhadeva Sahoo +2 more
doaj +1 more source
Multi-phase System Supplied by SVM VSI: A New Fast Algorithm to Compute Duty Cycles [PDF]
, 2004 La version éditeur de cette article est disponible à l'adresse suivante : http://www.epe-association.org/epe/index.phpMany authors proposed SVM VSI applied to multi-phase ...
HAUTIER, Jean-Paul +2 more
core +1 more source