Results 21 to 30 of about 10,921,507 (271)

Characterizing Quantum Effects in Optically Induced Nanowire Self-Oscillations: Coherent Properties

open access: yesPhotonics, 2021
Mechanical properties of metallic-nanowire self-oscillations are investigated through a coherent-state analysis. We focus on elucidating the time behavior of quantum energy in such oscillations, in addition to the analysis of fluctuations, evolution of ...
Jeong Ryeol Choi
doaj   +1 more source

The Impact of Primary Frequency Control of WTs on Ultra-Low Frequency Oscillation

open access: yesJournal of Physics: Conference Series, 2021
Abstract Since entering the 21st century, as wind power develops rapidly, wind power plays an increasingly important role in the safe and stable operation of power systems. Since the wind turbines under traditional control don’t provide frequency support, the frequency dynamics of the power grids after load disturbance will be ...
Lei Yang   +6 more
openaire   +1 more source

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

open access: yes, 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

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

open access: yesJournal 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

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

open access: yesIEEE 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

A pilot study of the impact of high-frequency chest wall oscillation in chronic obstructive pulmonary disease patients with mucus hypersecretion [PDF]

open access: yes, 2011
Indranil Chakravorty1, Kamaljit Chahal2, Gillian Austin21St George's Hospital, London, 2East and North Hertfordshire NHS Trust, Lister Hospital and Primary Care Trust, Stevenage, Hertfordshire, UKIntroduction: Chronic obstructive pulmonary ...
Chahal, K   +8 more
core   +1 more source

Tutorial on optoelectronic oscillators

open access: yesAPL 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

open access: yesJournal 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   +6 more
doaj   +1 more source

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

open access: yesPLoS 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   +5 more
doaj   +1 more source

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

open access: yes, 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.   +18 more
core   +3 more sources

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