Results 241 to 250 of about 148,775 (300)

On demand laser-induced frequency tuning of coherent magnons in a nanometer-thick magnet at room temperature. [PDF]

Nat Commun
Wiechert V, Wang H, Legrand W, Gambardella P, Breitbach D, Pirro P, Lammel M, Meo A, Finocchio G, Bossini D.   +9 more
europepmc   +1 more source

Coherent Driving of a Quantum System with Modulated Free-Space Electrons

Kolb M, Spielauer T, Weigner T, Boero G, Rätzel D, Haslinger P.   +5 more
europepmc   +1 more source

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Analysis of Air-Gap Field Modulation in Parallel-Hybrid-Excited Harmonic-Shift Machines

IEEE Transactions on Magnetics, 2021
In this article, the parallel-hybrid-excited harmonic-shift machine (PHE-HSM) is analyzed from the perspective of the field-modulation effect based on the air-gap field harmonics. By shifting the pole-pairs of the dc-field windings from those of the permanent magnets (PMs), the parallel-hybrid excitation can be realized due to field modulation.
Libing Cao, K. T. Chau, Christopher H. T. Lee, Wei Liu, T. W. Ching   +4 more
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Measurements of Harmonic Wake Fields Excited by Rough Surfaces

Physical Review Letters, 2002
An experiment has been carried out at the TESLA Test Facility linac to investigate the wake fields generated by picosecond electron bunches in narrow beam pipes with an artificially roughened inner surface. The energy structure imposed on the bunches by the wake fields has been analyzed with a magnetic spectrometer.
M, Hüning, H, Schlarb, P, Schmüser, M, Timm   +3 more
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Selective excitation in harmonic molecular systems by optimally designed fields

Chemical Physics, 1989
Abstract The goal of selective local excitation in a harmonic system can be achieved via optimally designed field. For achieving a given primary objective of selective excitation in the molecular system there may be a family of optimal fields that correspond to a variety of additional physical concerns.
Shenghua Shi, Herschel Rabitz
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Brushless wound rotor synchronous machine with third-harmonic field excitation

Electrical Engineering, 2019
This manuscript discusses a novel harmonic current excitation technique for a wound rotor synchronous machine based on control of the time harmonic magneto-motive force (MMF) for brushless operation. Two inverters are used to feed the armature winding in such a way that at a time, one inverter supplies the current to armature winding. The two inverters
Muhammad Ayub, Ghulam Jawad Sirewal, Syed Sabir Hussain Bukhari, Byung-il Kwon   +3 more
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Excitation of higher harmonic gratings in AC-field biased photorefractive crystals

Optics Communications, 1998
We analyze the nonlinear excitation of holographic gratings in a photorefractive crystal being subject to an alternating electric field and a stationary light interference pattern. The influence of the higher harmonics on the fundamental grating is illustrated for the case where a crystal of Bi12SiO20 is the recording medium. We analyze both the steady
Henrik C. Pedersen, Per M. Johansen, Evgeny V. Podivilov, D.J. Webb   +3 more
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Rare-earth-less motor with field poles excited by space harmonics

IECON 2013 - 39th Annual Conference of the IEEE Industrial Electronics Society, 2013
This paper describes a synchronous motor in which space harmonics power is utilized for field magnetization instead of permanent magnets. The stator has a concentrated winding structure, and the rotor has two sorts of windings, i.e., an induction pole (I-pole) winding that retrieves mainly the third space harmonics and an excitation pole (E-pole ...
Masahiro Aoyama, Toshihiko Noguchi
openaire   +1 more source