Results 261 to 270 of about 13,580 (276)

Transformer Oil Breakdown Dynamics Stressed by Fast Impulse Voltages: Experimental and Modeling Investigation

IEEE Transactions on Plasma Science, 2014
Streamer and breakdown behavior of transformer oil under impulse voltage are investigated with experimental observations and simulation. The optical observation by using Intensified Charge-coupled Device (ICCD) fast snapshot technique indicates that streamer channel branching is of a stochastic nature.
Yuan Li, Ming Xiao Zhu, Hai Bao Mu, Jun Bo Deng, Guan Jun Zhang, Jouya Jadidian, Markus Zahn, Wei Zheng Zhang, Zhi Min Li   +8 more
openaire   +1 more source

Fast impulsive noise removal in color images

2013 IEEE International Conference on Image Processing, 2013
In the paper a novel switching filter based on the reduced ordering statistics, combined with the peer group concept is proposed. The new technique assigns to each pixel the sum of the distances to two closest neighbors and if the sum exceeds a specified threshold, then the pixel is declared as corrupted and replaced, otherwise it is retained. The main
openaire   +1 more source

Greedy steep slope finder: The fast impulsive noise rejection for compressed measurement image signals

2012 International Symposium on Intelligent Signal Processing and Communications Systems, 2012
Impulsive noise in a compressed measurement signal can be detected by the energy distribution of the reconstructed sparse signal. In this paper, the fast preprocessing for impulsive noise rejection for a compressed measurement image signal is proposed. An image is sparsified by octave-tree wavelet transform with db8 as the mother wavelet. The impulsive
Suwichaya Suwanwimolkul, Parichat Sermwuthisarn, Supatana Auethavekiat   +2 more
openaire   +1 more source

An original setup to measure grounding resistances using fast impulse currents and very short leads

Electric Power Systems Research, 2019
Abstract This paper presents a method for measuring grounding resistances, which is based on the use of fast impulse current and short leads on the auxiliary measurement circuits. Usually, the conductor length of the voltage and current circuits used in grounding resistance measurements may be quite long depending on the grounding characteristics ...
A.B. Lima, C.E.F. Caetano, J.O.S. Paulino, W.C. Boaventura, I.J.S. Lopes, C.F. Barbosa   +5 more
openaire   +1 more source

How do fast impulse CMEs related to powerful flares but unrelated to eruptive filaments appear and move?

Advances in Space Research, 2015
Abstract GOES-12/SXI and SDO/AIA data were used to examine the formation and initial stage of movement for several fast pulse ‘halo’-type coronal mass ejections (HCMEs) that were related to GOES M and X class flares but unrelated to solar filament eruptions.
Iu.S. Zagainova, V.G. Fainshtein
openaire   +1 more source

Si/Ge Avalanche Photodiodes-Based Electrical Comb-Line Generators and Photoreceivers for Very-Fast Impulse Radio Wireless Linking

IEEE Photonics Technology Letters, 2012
We demonstrate the novel operation of a Si/Ge-based avalanche photodiode (APD) for the direct generation of ultra-wideband (UWB) frequency comb lines for impulse radio (IR) wireless communication. By applying a dc bias (Vbias) over the breakdown voltage (Vbr) of the APD, the device can exhibit a significant resonant frequency without any optical signal
Jin-Wei Shi, Feng-Ming Kuo, Daoxin Dai, John E. Bowers   +3 more
openaire   +1 more source

Streak Camera Observations of Partial Discharg Polyethylene under Fast Impulse Voltage Stress

1991 Annual Report. Conference on Electrical Insulation and Dielectric Phenomena,, 2005
Samples of polyethylene with electrical trees at the tip of a needle radius/9 mm gap) molded into the material were subjected to voltage impulses of between 50 and 85 kV (20 ns/2 /spl mu/s). The light emitted from the partial discharges was recorded with a streak camera. Light was emitted for less than 20 ns for a positive impulse of 70 kV.
openaire   +1 more source

Fenestration nodes and the wide submyelinic space form the basis for the unusually fast impulse conduction of shrimp myelinated axons

Journal of Experimental Biology, 1999
ABSTRACT Saltatory impulse conduction in invertebrates is rare and has only been found in a few giant nerve fibres, such as the pairs of medial giant fibres with a compact multilayered myelin sheath found in shrimps (Penaeus chinensis and Penaeus japonicus) and the median giant fibre with a loose multilayered myelin sheath found in the ...
K, Xu, S, Terakawa
openaire   +2 more sources

On the occurrence and the motion of fast impulsive coronal mass ejections associated with powerful flares and unassociated with eruptive filaments

Cosmic Research, 2015
The formation and initial stage of the motion of several rapid, impulsive coronal mass ejections of the “halo” type (HCME) associated with flares of M and X class, but unassociated with the eruption of solar filaments, was studied using GOES-12/SXI, SOHO/EIT, and SDO/AIA data.
V. G. Fainshtein, Yu. S. Zagainova
openaire   +1 more source

New Side-Looking Rogowski Coil Sensor for Measuring Large-Magnitude Fast Impulse Currents

Sensing and Imaging, 2014
This paper presents a new design of a side-looking “flat spiral” self-integrating Rogowski coil that is wound by twin coaxial cable with individual sheath. The coil is tested with different impulse current waveforms up to 7 kA peak value to improve its performance.
openaire   +1 more source