Results 51 to 60 of about 5,845,695 (202)

Synchronous frequency support of photovoltaic power plants with inertia emulation [PDF]

, 2019
©2019 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new ...
Candela García, José Ignacio, Rocabert Delgado, Joan, Rodríguez Cortés, Pedro, Tarraso Martínez, Andrés, Verdugo Retamal, Cristian Andrés   +4 more
core   +1 more source

Intern Self-Care: An Exploratory Study Into Strategy Use and Effectiveness [PDF]

, 2005
In this exploratory study, 363 interns were surveyed to assess the frequency of use and effectiveness of self-care strategies used during the internship year. Among the most frequently used strategies were family and friend social support, active problem
Castro, Jennifer R, Edwards, Lisa, Eicken, Iverson M, Haggins, Kristee L, Ngoc-Thuy Tran, Amber, Turner, Joseph A, Yokoyama, Kayoko   +6 more
core   +1 more source

Diffraction microtomography with sample rotation: influence of a missing apple core in the recorded frequency space

, 2008
Diffraction microtomography in coherent light is foreseen as a promising technique to image transparent living samples in three dimensions without staining.
A. C. Kak, A. Chomik, B. Colicchio, B. Simon, E. Wolf, F. Charrière, M. Born, M. Debailleul, M. K. Kreysing, N. Streibl, R. Da̋ndliker, S. Kawata, V. Lauer, W. Choi, W. Gorski   +14 more
core   +3 more sources

Short-segment heart sound classification using an ensemble of deep convolutional neural networks [PDF]

, 2018
This paper proposes a framework based on deep convolutional neural networks (CNNs) for automatic heart sound classification using short-segments of individual heart beats. We design a 1D-CNN that directly learns features from raw heart-sound signals, and
Noman, Fuad, Ombao, Hernando, Salleh, Sh-Hussain, Ting, Chee-Ming   +3 more
core   +2 more sources

Frequency support from PMSG-based wind turbines with reduced DC-link voltage fluctuations

CES Transactions on Electrical Machines and Systems, 2018
Frequency droop control is widely used in permanent magnet synchronous generators (PMSGs) based wind turbines (WTs) for grid frequency support. However, under frequency deviations, significant DC-link voltage fluctuations may occur during the transient ...
Jiafa He, Linbin Huang, Di Wu, Chengzhi Zhu, Huanhai Xin   +4 more
doaj   +1 more source

Maximum likelihood based estimation of frequency and phase offset in DCT OFDM systems under non-circular transmissions: algorithms, analysis and comparisons [PDF]

, 2008
Recently, the advantages of the discrete cosine transform (DCT) based orthogonal frequency-division multiplexing (OFDM) have come to the light. We thus consider DCT- OFDM with non-circular transmission (our results cover circular transmission as well ...
Cui, Tao, Gao, Feifei, Nallanathan, A., Tellambura, C.   +3 more
core   +1 more source

Natural frequencies of elastically supported orthotropic reactangular plates [PDF]

The Journal of the Acoustical Society of America, 1975
An expression is derived from which the natural frequencies of a rectangular orthotropic plate, under any combination of simply supported, elastically supported, or clamped boundary conditions, can be obtained. The Mindlin–Timoshenko theory, which includes the effects of transverse shear and rotary inertia, is used to describe the plate motion.
openaire   +1 more source

VSC-HVDC for Frequency Support (a review) [PDF]

13th IET International Conference on AC and DC Power Transmission (ACDC 2017), 2017
To reduce CO2 emissions produced by electricity generation, conventional fossil fuel power plants are being decommissioned. Renewable energy sources (RES) and interconnectors are replacing these old power plants but have different operating characteristics.
Fradley, John, Preece, Robin, Barnes, Michael   +2 more
openaire   +1 more source

Frequency Modulation Control of Grid-Forming Converter Based on LADRC-MI

Energies
The increasing proportion of new energy in the power system leads to a decrease in system inertia and weakens the frequency stability of the system. The use of grid-forming (GFM) control for inverters is an effective method to improve frequency stability
Zejian Liu, Fengneng Li, Ping Yang, Xu Lin, Guozun Zhang   +4 more
doaj   +1 more source

Real-time frequency parameter extraction for electronic support systems

2016 24th Signal Processing and Communication Application Conference (SIU), 2016
In this research, real time automatic frequency parameter extraction methods for electronic support systems are implemented on FPGA. The frequency parameter is extracted by using digital instantaneous frequency measurement (DIFM) and fast fourier transform (FFT) methods.
Ortatatli, Ismail Emre, Orduyilmaz, Adnan, Serin, Mahmut, Ozdil, Omer, Yildirim, Alper, Gurbuz, Ali Cafer   +5 more
openaire   +3 more sources