Results 71 to 80 of about 4,960,323 (312)

Generating Unconventional Spin‐Orbit Torques With Patterned Phase Gradients in Tungsten Thin Films

Advanced Materials, EarlyView.
ABSTRACT A key aim in spintronics is to achieve current‐induced magnetization switching via spin‐orbit torques without external magnetic fields. For this, the focus of recent work has been on introducing controlled lateral gradients across ferromagnet/heavy‐metal devices, giving variations in thickness, composition, or interface quality.
Lauren J. Riddiford, Anne Flechsig, Shilei Ding, Emir Karadža, Niklas Kercher, Tobias Goldenberger, Elisabeth Müller, Pietro Gambardella, Laura J. Heyderman, Aleš Hrabec   +9 more
wiley   +1 more source

Single-phase three-level regular-sampled selective harmonic elimination PWM

, 2001
A new harmonic elimination PWM strategy for single-phase VSI and CSI inverters is presented which closely approximates the exact switching angles produced offline for the harmonic elimination PWM (HEPWM) strategy. The new strategy is developed using well
Holliday, DMJ, Bowes, SR, Grewal, SS, S.R. Bowes, S. Grewal, D. Holliday   +5 more
core   +1 more source

Mathematical Procedure for Harmonic Elimination in CHB Multilevel Inverters with Variable DC Sources

, 2020
In this paper, a single-phase cascaded H-bridge (CHB) multilevel inverter having s DC sources and a number of levels l = 2s+1 with s = 2n n = 1, 2, 3, . . . is considered, and a method to eliminate n + 1 harmonics and their respective multiple from
Carlo Cecati, Concettina Buccella, Maria Gabriella Cimoroni   +2 more
core   +1 more source

Resonant Domain Wall Dynamics in a Three‐Dimensional Magnetic Nano Double Helix

Advanced Materials, EarlyView.
3D magnetic nanostructures promise exciting possibilities for magnetization dynamics. However, experimental realizations remain scarce. In nanoprinted cobalt double helices, time‐resolved X‐ray microscopy reveals harmonic domain wall dynamics. Simulations identify the mode and additional higher‐frequency resonances, revealing a rich dynamic landscape ...
Pamela Morales‐Fernández, Iason Konstantinos‐Douveas, Claas Abert, Elina Zhakina, Sandra Ruiz‐Gómez, Claudia Fernández‐González, Luke Alexander Turnbull, Sebastian Wintz, Markus König, Simone Finizio, Markus Weigand, Naëmi Leo, Dieter Suess, Aurelio Hierro‐Rodríguez, Amalio Fernández‐Pacheco, Claire Donnelly   +15 more
wiley   +1 more source

Regular-sampled harmonic elimination PWM control of single-phasetwo-level inverters

, 2001
A new harmonic elimination/minimisation pulse width modulation strategy for single-phase inverters is presented. The two-level harmonic elimination pulse width modulation strategy operates online and in real-time and closely approximates the switching ...
Holliday, DMJ, Bowes, SR, Grewal, SS, S.R. Bowes, D. Holliday, S. Grewal   +5 more
core   +1 more source

Stator-Current-and-Voltage-Sensorless Model Predictive Control of a Doubly Fed Induction Generator Direct Current System

Electrica
This paper presents an advanced control strategy for a doubly fed induction generator direct current system. The proposed method employs a rotor-current-based model predictive control (MPC) scheme that operates without stator voltage and current sensors.
Hadi Afsharirad, Fahimeh Sadighi-Amandi, Mohamad Reza Banaei, Sara Misaghi   +3 more
doaj   +1 more source

Simple analytical solution for selective harmonic elimination technique

Electronics Letters, 2016
A new simple analytical and closed‐form solution for the harmonic content injected in the five‐level inverters at low switching control technique is proposed. The equations of the fundamental and the third harmonic are formulated and solved. The switching angles have been calculated to fix the fundamental voltage at a specified value and cancel the ...
M. Ahmed, E. Hendawi, I.B.M. Taha
openaire   +2 more sources

Large‐Scale Determination of Frontier Orbital Energies of Disordered Small‐Molecule Organic Semiconductors Using Exciplex Emission Spectra

Advanced Materials, EarlyView.
ABSTRACT Accurately knowing the frontier orbital energies of the structurally disordered small‐molecule organic semiconductors that are used in optoelectronic devices such as organic light‐emitting diodes is required to rationally improve their performance. Here, we show that these energies can be deduced with a large accuracy from the peak energies of
Christian B. McDonald, Hiroki Tomita, Giacomo Cotelli, Louka L. Brüll, Nanno G. de Rooij, Lucas R.L. Norg, Milo Clément, Reinder Coehoorn   +7 more
wiley   +1 more source

THDv Reduction in Multilevel Three-Phase Inverters Using the SHE-PWM Technique with a Hybrid Optimization Algorithm

Energies
The following article aims to implement a hybrid modulation methodology based on the Selective Harmonic Elimination Pulse Width Modulation (SHE-PWM) technique to work with the fundamental frequency of the system and find the optimal firing angles using ...
Miguel Ayala, Luis Tipán, Manuel Jaramillo, Cristian Cuji   +3 more
doaj   +1 more source

A "nearly parametric" solution to Selective Harmonic Elimination PWM

, 2015
Selective Harmonic Elimination Pulse Width Modulation (SHEPWM) is an important technique to solve PWM problems, which control the output voltage of an inverter via selecting appropriate switching angles. Based on the Rational Univariate Representation (RUR) theory for solving polynomial systems, the paper presents an algorithm to compute a "nearly ...
Shang, Bao-Xin, Zhang, Shu-Gong, Lei, Na, Chen, Jing-Yi   +3 more
openaire   +2 more sources