Results 31 to 40 of about 2,660,702 (309)

Strong-Field QED and High Power Lasers [PDF]

, 2011
This contribution presents an overview of fundamental QED processes in the presence of an external field produced by an ultra-intense laser. The discussion focusses on the basic intensity effects on vacuum polarisation and the prospects for their ...
Heinzl, Thomas
core   +3 more sources

Proposed methodology for online frequency response analysis based on magnetic coupling to detect winding deformations in transformers

High Voltage, 2019
Frequency response analysis is widely used as a method for the offline diagnosis of winding deformations in power transformers. To apply it to a working transformer, people need to determine how to inject the excitation signal and measure the response ...
Yangchun Cheng, Jiangang Bi, Jiangang Bi, Wenzhi Chang, Yuan Xu, Xiaohua Pan, Xianwei Ma, Shuai Chang   +7 more
doaj   +1 more source

Thermal Performance of Two-phase Loop Thermosiyphon under Different Filling Ratios and Heat Transfer Distances [PDF]

Journal of Applied Fluid Mechanics
To address the thermal challenges of electronic chips in an energy-efficient manner, this study proposes an optimized two-phase loop thermosiyphon (TPLT) system featuring a mini-channel evaporator, finned condenser, and flexible tubing.
Y. Yang, Y. Liu, Z. Yan, Z. Jiang
doaj   +1 more source

Comparison of effectiveness and safety of high-power vs. conventional-power radiofrequency ablation for treatment of atrial fibrillation

Frontiers in Cardiovascular Medicine, 2022
AimTo compare high-power (HP) vs. conventional-power (CP) radiofrequency ablation for atrial fibrillation (AF).MethodsWe retrospectively enrolled AF patients undergoing CP (30–40 W, 43 patients) or HP (50 W, 49 patients) radiofrequency ablation ...
Penghui Cui, Yunpeng Qu, Jichang Zhang, Junduo Wu, Jing Zhang, Yongfeng Shi, Bin Liu   +6 more
doaj   +1 more source

Optical Fiber for High-Power Optical Communication

Crystals, 2012
We examined optical fibers suitable for avoiding such problems as the fiber fuse phenomenon and failures at bends with a high power input. We found that the threshold power for fiber fuse propagation in photonic crystal fiber (PCF) and hole-assisted ...
Kenji Kurokawa
doaj   +1 more source

Modular Four-Channel 50 kW WPT System With Decoupled Coil Design for Fast EV Charging

IEEE Access, 2021
High-power wireless power transfer (WPT) is an attractive option for fast charging of electric vehicles (EVs), but the power capability of the WPT system is limited by power devices and resonant elements.
Hao Chen, Zhongnan Qian, Ruoqi Zhang, Zhuhaobo Zhang, Jiande Wu, Hao Ma, Xiangning He   +6 more
doaj   +1 more source

High-power subnanosecond switch

Electronics Letters, 1980
A triggering mechanism, unconnected with carrier transfer effects at long distances, for power commutation of 105–106 W in the subnanosecond range, is believed to have been found from the study of the avalanche breakdown process. The switching time does not increase when the diodes are connected in series.
I.V. Grekhov, A.F. Kardo-Sysoev, L.S. Kostina, S.V. Shenderey   +3 more
openaire   +1 more source

Construction and operation of high power gas lasers [PDF]

, 1987
In the present paper some typical gas laser construction and their performances will be described.
Ernst, G.J., Peters, P.J.M., Witteman, W.J.   +2 more
core   +3 more sources

Discrete-time deadbeat control for STATCOMs based on dq reference frame: a high-speed, tuning-free strategy for reactive current regulation

Frontiers in Energy Research
The increasing penetration of distributed generation and the evolving requirements of smart grids have heightened the demand for fast, accurate, and robust reactive power control in Static Synchronous Compensators (STATCOMs). While proportional-integral (
Haiyang Liang, A. Minfu, Yanbin Zhang, Yi Zhang, Shiguang Zhan, Yunlong Zhang, Yiwen Zhang, Zhenhua Tian   +7 more
doaj   +1 more source

High-Rate Laser Surface Texturing for Advanced Tribological Functionality

Lubricants, 2020
This article features with the enhancement of the static coefficient of friction by laser texturing the contact surfaces of tribological systems tested under dry friction conditions.
Jörg Schille, Lutz Schneider, Stefan Mauersberger, Sylvia Szokup, Sören Höhn, Johannes Pötschke, Friedemann Reiß, Erhard Leidich, Udo Löschner   +8 more
doaj   +1 more source