Results 1 to 10 of about 2,250 (118)

Analysis of Biweekly Oscillation and Low-Frequency Circulation Characteristics of Summer Precipitation in Drought-Flood Years over the Qinghai-Xizang Plateau

Gaoyuan qixiang, 2023
In order to study the characteristics of low frequency oscillation of summer precipitation over Qinghai-Xizang Plateau， based on the daily precipitation data of 62 meteorological stations over the Qinghai-Xizang Plateau from 1978 to 2017 and the high ...
Xizhao WANG, Yu ZHANG, Minhong SONG, Yuting ZENG, Tianya LI   +4 more
doaj   +1 more source

High-frequency oscillation in adolescents [PDF]

British Journal of Anaesthesia, 2002
High-frequency oscillation (HFO) is a widely used lung-protective ventilatory strategy in paediatric and neonatal acute lung injury. Its safe and effective use has been hindered by inadequate recruitment of the lung during oscillation and, until recently, the lack of an adequately powered oscillator for use in adult practice.We present data from three ...
S, Moganasundram, A, Durward, S M, Tibby, I A, Murdoch   +3 more
openaire   +2 more sources

Influence of Static Var Generator on High Frequency Oscillation of Doubly-Fed Wind Farm

Zhongguo dianli, 2022
The connection of static var generator (SVG) in doubly-fed wind farms can easily cause high frequency oscillation in the system, which seriously threatens the safe and stable operation of wind farms.
Linlin WU, Hao CHENG, Jingbo LIU, Dongye DU, Chao GONG, Chunyi GUO   +5 more
doaj   +1 more source

Experimental Investigation on the High-frequency Pressure Oscillation Characteristics of a Combustion Process in a DI Diesel Engine

Energies, 2020
It is difficult to decompose the in-cylinder pressure of combustion of the direct injection (DI) diesel engine, a transient process associated with complicated oscillation components, because of its steep property. An adaptive cyclic average method based
Xu Zheng, Nan Zhou, Quan Zhou, Yi Qiu, Ruijun Liu, Zhiyong Hao   +5 more
doaj   +1 more source

Negative Conductance Modeling and Stability Analysis of High-Frequency Oscillation Based on Cascode GaN Circuits

IEEE Access, 2020
GaN devices are developed rapidly in recent years, which makes it possible to produce power electronic converters with higher efficiency and higher power density.
Fangwei Zhao, Yan Li, Zihan Chen, Shuaifei Yang, Jiangui Chen   +4 more
doaj   +1 more source

Low-frequency oscillation analysis of two-stage photovoltaic grid-connected system

Energy Reports, 2022
The low-frequency oscillation (LFO) problem of photovoltaic (PV) grid-connected systems has been a critical concern for safe operation, whereas the impact of dc-side components of PV plants are always ignored and single-stage PV plant is used. This paper
Bingbing Shao, Zilong Miao, Liyuan Wang, Xiaoxiao Meng, Zhe Chen   +4 more
doaj   +1 more source

The impact of persistent anomalous precipitation in Southwest China caused by low-frequency atmospheric disturbances in different latitudes and altitudes

Frontiers in Earth Science, 2023
Previous studies have pointed out that persistent abnormal precipitation is closely related to atmospheric low-frequency oscillation, and Southwest China can be affected by low-frequency oscillation in different latitudes and altitudes.
Tian-Gui Xiao, Tian-Gui Xiao, Yao Huang, Yao Huang, Lin Han, Lin Han, Ya-yue Nong   +6 more
doaj   +1 more source

Spin-Torque Oscillator Based on Magnetic Domain and Meron

Frontiers in Physics, 2022
In this work, micromagnetic simulations demonstrate that a steady oscillation mode accompanied by magnetic domain splitting and the creation and annihilation of meron can be excited by spin-polarized currents.
Gang Lv, Gang Lv, Hong Zhang, Hong Zhang, Xuecheng Cao, Feng Gao, Guihua Li, Fengwei Sun, Zhiwei Hou, Yaowen Liu   +9 more
doaj   +1 more source

Low frequency oscillation characteristics of East China Power Grid after commissioning of Huai-Hu ultra-high voltage alternating current project

Journal of Modern Power Systems and Clean Energy, 2015
The low frequency oscillation characteristics of East China Power Grid after commissioning of the first ultra-high voltage alternating current (UHVAC) project-the Huai-Hu UHVAC project are studied. Several low frequency oscillation cases occurred in East
Chao Wang, Yang Lv, Hongyang Huang, Jing Zhang, Jihong Li, Yingyi Li, Weizhen Sun, Yong Chang   +7 more
doaj   +1 more source

A Comprehensive Investigation on High-Frequency Oscillation in DC Microgrid

IEEE Access, 2021
This paper presents the small-signal stability performance of a dc microgrid (MG) and investigates the interactions between the converter controllers by studying the critical modes.
Mohammad Habibullah, Nadarajah Mithulananthan, Krischonme N. Bhumkittipich, Mohammad Amin   +3 more
doaj   +1 more source