Results 21 to 30 of about 240,730 (259)

Generalized MIMO Sequence Impedance Modeling and Stability Analysis of MMC-HVDC With Wind Farm Considering Frequency Couplings

IEEE Access, 2020
Recently, small-signal stability of the modular multilevel converter (MMC) based high-voltage direct current (HVDC) transmission for wind farm integration has attracted great attentions.
Haoxiang Zong, Chen Zhang, Jing Lyu, Xu Cai, Marta Molinas, Fangquan Rao   +5 more
doaj   +1 more source

Impedance Modeling Based Method for Sub/Supsynchronous Oscillation Analysis of D-PMSG Wind Farm

Applied Sciences, 2019
Subsynchronous oscillation (SSO) is a critical issue for the direct-drive permanent magnet synchronous generator (D-PMSG) based wind farm integrated to a weak onshore AC grid.
Saijun Yuan, Zhiguo Hao, Tao Zhang, Xiaotian Yuan, Jin Shu   +4 more
doaj   +1 more source

Stability diagrams of two optically mutual-injected quantum cascade lasers

AIP Advances, 2021
The dynamic properties and stability of optically mutual-injected arrays composed of terahertz quantum cascade lasers (THz QCLs) were investigated and compared with those of diode laser (DL) arrays.
Y. Li, N. Yang, W. Chu, S. Duan, Y. Xie, J. Sun, T. Ren   +6 more
doaj   +1 more source

Theta-gamma phase-amplitude coupling: physiological basics, analysis methods, and perspectives of translation into clinical practice [PDF]

Анналы клинической и экспериментальной неврологии, 2022
Studying rhythmic neural synchronization (cross-frequency coupling in various ranges) is an emerging topic in present-day neurophysiology. One of the best-studied cross-frequency couplings is theta-gamma phase-amplitude coupling that contributes to the ...
Alexandra G. Poydasheva, Ilya S. Bakulin, Dmitry O. Sinitsyn, Alfiya H. Zabirova, Dmitry Yu. Lagoda, Natalia A. Suponeva, Michael A. Piradov   +6 more
doaj   +1 more source

Parametric estimation of cross-frequency coupling

Journal of Neuroscience Methods, 2015
Growing experimental evidence suggests an important role for cross-frequency coupling in neural processing, in particular for phase-amplitude coupling (PAC). Although the details of methods to detect PAC may vary, a common procedure to estimate the significance level is the comparison of observed values to those of at least 100 surrogate time series ...
van Wijk, BC, Jha, A, Penny, W, Litvak, V   +3 more
openaire   +3 more sources

Impact of Catheter Ablation on Sleep Quality and Relationship Between Sleep Stability and Recurrence of Paroxysmal Atrial Fibrillation After Successful Ablation: 24‐Hour Holter‐Based Cardiopulmonary Coupling Analysis

Journal of the American Heart Association: Cardiovascular and Cerebrovascular Disease, 2020
Background Sleep fragmentation and sleep apnea are common in patients with atrial fibrillation (AF). We investigated the impact of radio‐frequency catheter ablation (RFCA) on sleep quality in patients with paroxysmal AF and the effect of a change in ...
Woohyeun Kim, Jin Oh Na, Robert J. Thomas, Won Young Jang, Dong Oh Kang, Yoonjee Park, Jah Yeon Choi, Seung‐Young Roh, Cheol Ung Choi, Jin Won Kim, Eung Ju Kim, Seung‐Woon Rha, Chang Gyu Park, Hong Seog Seo, Hong Euy Lim   +14 more
doaj   +1 more source

High-frequency air-coupled transducers [PDF]

The Journal of the Acoustical Society of America, 1990
High-frequency air-coupled ultrasonic transducers are used in industrial applications for detecting or ranging with high resolution. The improvement of the coupling between PZT and air is of importance for the transducer performance. Unfortunately, it is difficult to find a material with proper acoustical impedance and small attenuation at high ...
Xiaoqi Bao, Vasundara V. Varadan, Vijay K. Varadan   +2 more
openaire   +1 more source

Self-Mixing Signal Characteristics of Complex-Coupled Distributed-Feedback Terahertz Quantum-Cascade Lasers

Frontiers in Physics, 2021
Self-mixing interference (SMI) in terahertz quantum cascade lasers (THz QCLs) is one of the significant approaches for coherent THz imaging and sensing techniques.
Lei Ge, Ning Yang, Jian Wang, Weidong Chu, Suqing Duan, Yan Xie, Yingxin Wang, Lianhe Li, Edmund Linfield   +8 more
doaj   +1 more source

Control Strategy for Improving Active Frequency Support Capability of Offshore Wind Farm

Shanghai Jiaotong Daxue xuebao
In low frequency alternating current (AC) transmission systems, offshore wind farm is unable to respond to changes in onshore grid frequency in a timely manner due to frequency decoupling and signal transmission delays between the offshore wind power ...
LI Yibo, ZHOU Qian, ZHU Dandan, JIANG Yafeng, WU Qiuwei, CHEN Jian
doaj   +1 more source

Misidentifications of specific forms of cross-frequency coupling: three warnings

Frontiers in Neuroscience, 2015
Cross-frequency coupling between neural oscillations has received increased attention over the last decade, as it is believed to underlie a number of cognitive operations in different brain systems.
Alexandre eHYAFIL, Alexandre eHYAFIL
doaj   +1 more source