Results 21 to 30 of about 9,007 (253)

Multi-Mode Lasers for Self-Forced Opto-Electronic Oscillators in Compact Frequency Synthesizers

IEEE Journal of Microwaves, 2021
Advanced telecommunication, imaging, and remote sensing systems require reliable ultra-high stability local oscillators. Particularly, coherent detection of digital data signals relies on a low aperture jitter of local oscillators in addition to high ...
Afshin S Daryoush, Tianchi Sun
doaj   +1 more source

Analysis of Mode Interaction in Ultra-low Frequency Oscillation Based on Trajectory Eigenvalue

Journal of Modern Power Systems and Clean Energy, 2020
Complex phenomena such as prolongedly undamped ultra-low frequency oscillation (ULFO) and eigenmode re-excitation are observed in the simulations of hydroelectric power systems.
Yusheng Xue, Zijun Bin
doaj   +1 more source

On the Relationship between Ultra Low Frequency Oscillation and Power System Inertia

2023 IEEE Power & Energy Society General Meeting (PESGM), 2023
Peer ...
Lehtonen, Matti, Kuivaniemi, Mikko, Haarla, Liisa, Seppänen, Janne   +4 more
openaire   +3 more sources

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

Frequency Dynamic Characteristic Analysis of Ultra-Low Frequency Oscillation and Multi-Machine GPSS Parameter Tuning Method [PDF]

Dianli jianshe
[Objective] The growing concern over frequency stability is attributed to the decreasing overall inertia of power systems. To improve the analysis of frequency stability and performance of modern power systems， a frequency dynamic characteristic analysis
ZENG Pijiang, XU Hao, YE Pengju, ZHENG Chao, SAI Xiangyu, CHEN Gang, ZHAO Yong, JIANG Chuyang, GAN Deqiang
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

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