Results 31 to 40 of about 8,850 (277)

Ultra-low frequency photocurrent self-oscillation in strained InxGa1-xAs quantum well diodes

, 2007
Ultra-low frequency photocurrent (PC) self-oscillation has been investigated in a In0.15Ga0.85As/Al0.15Ga0.85As quantum-well (QW) diode in details as a function of temperature, excitation power and wavelength.
Sano, N, Tanigawa, K, Fujiwara, Kenzo
core   +2 more sources

Modulation of NTC frequencies by Pc5 ULF pulsations : experimental test of the generation mechanism and magnetoseismology of the emitting surface [PDF]

, 2009
Nonthermal continuum (NTC) radiation is believed to be emitted by the conversion of an electrostatic wave into an electromagnetic one, which takes place at the Earth's magnetic equator.
Le Rouzic, G., Décréau, Pierrette, Vallières, X., Vallières, Xavier, Grimald, S., Foullon, C. (Claire), Décréau, P. M. E., Foullon, C., Suraud, X.   +8 more
core   +1 more source

Tutorial on optoelectronic oscillators

APL Photonics, 2021
Microwave photonic approaches for the generation of microwave signals have attracted substantial attention in recent years, thanks to the significant advantages brought by photonics technology, such as high frequency, large bandwidth, and immunity to ...
Ming Li, Tengfei Hao, Wei Li, Yitang Dai
doaj   +1 more source

Deep Reinforcement Learning Enabled Bi-Level Robust Parameter Optimization of Hydropower-Dominated Systems for Damping Ultra-Low Frequency Oscillation

Journal of Modern Power Systems and Clean Energy, 2023
This paper proposes a robust and computationally efficient control method for damping ultra-low frequency oscillations (ULFOs) in hydropower-dominated systems.
Guozhou Zhang, Junbo Zhao, Weihao Hu, Di Cao, Nan Duan, Zhe Chen, Frede Blaabjerg   +6 more
doaj   +1 more source

Frequency dependent topological patterns of resting-state brain networks. [PDF]

PLoS ONE, 2015
The topological organization underlying brain networks has been extensively investigated using resting-state fMRI, focusing on the low frequency band from 0.01 to 0.1 Hz.
Long Qian, Yi Zhang, Li Zheng, Yuqing Shang, Jia-Hong Gao, Yijun Liu   +5 more
doaj   +1 more source

Ultra-Narrow Bandwidth Microwave Photonic Filter Implemented by Single Longitudinal Mode Parity Time Symmetry Brillouin Fiber Laser

Micromachines, 2023
In this paper, a novel microwave photonic filter (MPF) based on a single longitudinal mode Brillouin laser achieved by parity time (PT) symmetry mode selection is proposed, and its unparalleled ultra-narrow bandwidth as low as to sub-kHz together with ...
Jiaxin Hou, Yajun You, Yuan Liu, Kai Jiang, Xuefeng Han, Wenjun He, Wenping Geng, Yi Liu, Xiujian Chou   +8 more
doaj   +1 more source

Magnetopause surface oscillation frequencies at different solar wind conditions [PDF]

Annales Geophysicae, 2009
Statistical analyses of the magnetopause (MP) motion observed by THEMIS suggested that the MP oscillates preferably at some prominent (sometimes called "magic") frequencies, which were found to stand out also in ground-based and ionospheric ...
F. Plaschke, K.-H. Glassmeier, K.-H. Glassmeier, D. G. Sibeck, H. U. Auster, O. D. Constantinescu, V. Angelopoulos, W. Magnes   +7 more
doaj   +1 more source

Ultra-Low-Loss Silicon Nitride Photonics Based on Deposited Films Compatible with Foundries

, 2023
The fabrication processes of silicon nitride photonic devices used in foundries require low temperature deposition, which typically leads to high propagation losses.
Michal Lipson (1708255), Andres Gil-Molina (4422112), Samantha Roberts (4805808), Alexander L. Gaeta (3959597), Xingchen Ji (4180468), Yoshitomo Okawachi (3983930), Mateus Corato-Zanarella (14380365)   +6 more
core   +1 more source

Ultra-low-frequency self-oscillation of photocurrent in InxGa1–xAs/Al0.15Ga0.85As multiple-quantum-well p–i–n diodes

, 2004
We report an observation of ultra-low-frequency self-oscillation of photocurrent in InxGa1–xAs/Al0.15Ga0.85As multiple-quantum-well p–i–n diodes. The photocurrent intensity shows self-oscillations with a characteristic frequency of ~0.1 Hz at low ...
Tanigawa, K., Sano, N., Kimura, T., 90243980, 佐竹, 昭泰, Fujiwara, Kenzo, Satake, Akihiro, 7403468236, 252, フジワラ, ケンゾウ, 552, 1138, 553, 555, 藤原, 賢三, サタケ, アキヒロ, 86, 90325572, 56259812400   +18 more
core   +2 more sources

Multiple DC Modulation Coordination Strategies Based on Transient Energy Function and Deep Deterministic Policy Gradient Algorithm

Applied Sciences
Ultra-low-frequency oscillation (ULFO) is a new problem of frequency stability in asynchronous network back-end power networks. The negative damping provided by hydropower units is the direct cause of ultra-low-frequency oscillation, and DC modulation is
Chao Xing, Mingqun Liu, Junzhen Peng, Xueke Wang, Yuhong Wang, Zongsheng Zheng, Shilin Gao, Jianquan Liao   +7 more
doaj   +1 more source