Results 11 to 20 of about 7,655,912 (239)
EnergiesHybrid-excited generators have a wide voltage regulation capability or a wide range of variable-speed constant-voltage output capability, providing a significant advantage in the new energy power generation field.
Yonghong Xia +5 more
doaj +2 more sources
Low frequency room excitation using Distributed Mode Loudspeakers [PDF]
, 2002 Conventional pistonic loudspeakers excite the modes of an enclosed sound field in such a way as to introduce modal artefacts which may be problematic for listeners to high-quality reproduced sound [1].
Fazenda, Bruno, Avis, M.R., Davies, W.J.
core +5 more sources
Ionospheric electron heating, optical emissions, and striations induced by powerful HF radio waves at high latitudes: Aspect angle dependence [PDF]
, 2003 In recent years, large electron temperature increases of 300% (3000 K above background) caused by powerful HF-radio wave injection have been observed during nighttime using the EISCAT incoherent scatter radar near Tromsø in northern Norway.
Rietveld, M. T. +5 more
core +5 more sources
Excitation of higher harmonic gratings in AC-field biased photorefractive crystals
, 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.
Johansen, Per M. +3 more
core +9 more sources
Label-free 3D visualization of cellular and tissue structures in intact muscle with second and third harmonic generation microscopy. [PDF]
, 2011 Second and Third Harmonic Generation (SHG and THG) microscopy is based on optical effects which are induced by specific inherent physical properties of a specimen.
Krombach Fritz +11 more
core +2 more sources
Fault-Tolerant Operation of Wound Field Synchronous Machine Using Coil Switching
IEEE Access, 2019 This paper proposes a fault tolerant operation of a wound field synchronous machine (WFSM) under the loss of excitation (LOE) fault in the rotor field winding. A two-mode field excitation scheme is presented, where the rotor of the WFSM was modified, and
Muhammad Ayub +3 more
doaj +1 more source
Brushless Field Excitation Scheme for Wound Field Synchronous Machines
Applied Sciences, 2020 A new harmonic field excitation technique for the brushless operation of wound field synchronous machines (WFSMs) is proposed in this paper. The proposed scheme involves conventional three-phase and single-phase inverters operating at different ...
Syed Sabir Hussain Bukhari +3 more
doaj +1 more source
Novel Self-Excited Brush-Less Wound Field Vernier Machine Topology
IEEE Access, 2022 To realize the brush-less operation for wound field vernier machines (WFVMs), a novel self-excited topology is proposed in this paper which involves a four-pole main armature winding and a two-pole excitation winding connected in series using an ...
Syed Sabir Hussain Bukhari +6 more
doaj +1 more source
Photonics, 2023 The valley pseudospin properties of electrons in two-dimensional hexagonal materials result in many fascinating physical phenomena, which opens up the new field of valleytronics.
Xi Liu +4 more
doaj +1 more source
Design and Analysis of Single Inverter-Fed Brushless Wound Rotor Vernier Machine
IEEE Access, 2022 In this paper, a brushless wound rotor vernier machine (Bl-WRVM) with a single inverter configuration is proposed to achieve the brushless operation.
Sara Tariq +5 more
doaj +1 more source