Research on HVDC frequency limit control to improve frequency restoration in muti-HVDC asynchronous system

2019 ◽  
Author(s):  
Jiyu Huang ◽  
Yiping Chen ◽  
Qin Gao ◽  
Yong Zhang ◽  
Ruopu Yang ◽  
...  
Keyword(s):  
Asynchronous System ◽  
Frequency Limit

Evaluation of Special Hearing Aids for Deaf Children

1971 ◽  
Vol 36 (4) ◽  
pp. 527-537 ◽  
Author(s):  
Norman P. Erber
Keyword(s):  
Hearing Aids ◽  
High Frequency ◽  
Hearing Aid ◽  
Low Frequency ◽  
Acoustic Stimulation ◽  
Deaf Children ◽  
Frequency Range ◽  
Frequency Limit ◽  
Unpublished Studies ◽  
Published Research

Two types of special hearing aid have been developed recently to improve the reception of speech by profoundly deaf children. In a different way, each special system provides greater low-frequency acoustic stimulation to deaf ears than does a conventional hearing aid. One of the devices extends the low-frequency limit of amplification; the other shifts high-frequency energy to a lower frequency range. In general, previous evaluations of these special hearing aids have obtained inconsistent or inconclusive results. This paper reviews most of the published research on the use of special hearing aids by deaf children, summarizes several unpublished studies, and suggests a set of guidelines for future evaluations of special and conventional amplification systems.

Research and Engineering Application of DC Frequency Limit Control in DXB DC Project

2021 ◽  
Author(s):  
Wei Huang ◽  
Lifei Zhang ◽  
Xiaogang Wu ◽  
Chengxiang Li ◽  
Jie Zhang ◽  
...  
Keyword(s):  
Engineering Application ◽  
Frequency Limit

An MTJ-Based Asynchronous System With Extremely Fine-Grained Voltage Scaling

2021 ◽  
Vol 68 (1) ◽  
pp. 311-321
Author(s):  
Ningyuan Yin ◽  
Baofa Huang ◽  
Xiaobai Chen ◽  
Jianjun Chen ◽  
Zhiyi Yu
Keyword(s):  
Voltage Scaling ◽  
Asynchronous System ◽  
Fine Grained

Onset of size effects in lattice thermal conductivity and lifetime of low-frequency thermal phonons

2012 ◽  
Vol 1404 ◽  
Author(s):  
A.A. Maznev
Keyword(s):  
Thin Film ◽  
Thermal Conductivity ◽  
Size Effects ◽  
Lattice Thermal Conductivity ◽  
Low Frequency ◽  
Square Root ◽  
Relaxation Rates ◽  
Frequency Limit ◽  
Conductivity Of Thin Films ◽  
Closed Form Formula

ABSTRACTThe onset of size effects in phonon-mediated thermal transport along a thin film at temperatures comparable or greater than the Debye temperature is analyzed theoretically. Assuming a quadratic frequency dependence of phonon relaxation rates in the low-frequency limit, a simple closed-form formula for the reduction of the in-plane thermal conductivity of thin films is derived. The effect scales as the square root of the film thickness, which leads to the prediction of measurable size-effects even at “macroscopic” distances ~100 μm. However, this prediction needs to be corrected to account for the deviation from the ω−2 dependence of phonon lifetimes at sub-THz frequencies due to the transition from Landau-Rumer to Akhiezer mechanism of phonon dissipation.

Extending the Frequency Limit of Microstrip-Coupled CSRR Using Asymmetry

2021 ◽  
pp. 1-1
Author(s):  
Abhishek Kumar Jha ◽  
Adam Lamecki ◽  
Roberto Gomez-Garcia ◽  
Michal Mrozowski
Keyword(s):  
Frequency Limit

scholarly journals Frequency regulation strategy based on variable-parameter frequency limit control during black start

2018 ◽  
Vol 12 (17) ◽  
pp. 4002-4008
Author(s):  
Chengjun Xia ◽  
Chengxiang Li ◽  
Haiwen Lan ◽  
Zhaobin Du ◽  
Yiping Chen
Keyword(s):  
Variable Parameter ◽  
Frequency Regulation ◽  
Frequency Limit

scholarly journals Nonlinear interaction between acoustic gravity waves

1996 ◽  
Vol 14 (3) ◽  
pp. 304-308 ◽  
Author(s):  
P. Axelsson ◽  
J. Larsson ◽  
L. Stenflo
Keyword(s):  
Gravity Waves ◽  
Nonlinear Interaction ◽  
Low Frequency ◽  
Resonant Interaction ◽  
Coupling Coefficients ◽  
Symmetric Form ◽  
Frequency Limit ◽  
Acoustic Gravity Waves

Abstract. The resonant interaction between three acoustic gravity waves is considered. We improve on the results of previous authors and write the new coupling coefficients in a symmetric form. Particular attention is paid to the low-frequency limit.

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