Results 231 to 240 of about 1,880,507 (277)

Electric Field Changes Generated by the Preliminary Breakdown for the Negative Cloud-to-Ground Lightning Flashes in Malaysia and Sweden [PDF]

Journal of Atmospheric and Solar-Terrestrial Physics, 2012
We present the study of the electric field changes generated by the preliminary breakdown for negative cloud-to-ground lightning flashes in Malaysia and Sweden concerning the association of slow field changes associated in preliminary breakdown process ...
Vernon Cooray, Mahbubur Rahman, M Fernando   +2 more
exaly   +4 more sources

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Properties of preliminary breakdown processes in Scandinavian lightning

Journal of Atmospheric and Solar-Terrestrial Physics, 2008
Lightning flashes are usually preceded by preliminary breakdown processes (PBPs) before a stepped leader is initiated. These breakdown processes are not well understood. An early model, the so-called BIL model, has been called into question in later studies.
Jakke S. Mäkelä, Niko Porjo, Antti Mäkelä, Tapio Tuomi, Vernon Cooray   +4 more
openaire   +1 more source

Observed preliminary breakdown pulses of intracloud discharges

2017 International Conference on High Voltage Engineering and Power Systems (ICHVEPS), 2017
Compact intracloud discharge (CID) pulses have strong radio frequency radiation, large amplitude and a short duration of several microseconds. There are two types of CIDs, namely positive and negative CID. CID electric field signatures appear without any detectable initial breakdown process.
Primas Emeraldi, Ariadi Hazmi
openaire   +1 more source

Microchip Laser-Induced Breakdown Spectroscopy: A Preliminary Feasibility Investigation

Applied Spectroscopy, 2004
A commercial, 7 μJ/pulse, 550 ps microchip laser is used to induce plasma on Pb, Si, Cu, Fe, Ni, Ti, Zn, Ta, and Mo foils and a Si wafer. The measured plasma lifetime is comparable with the duration of the laser pulse (a few ns). The plasma continuum radiation is low, while some of the strong resonance lines (e.g., Zn 213.86 nm) show self-reversal ...
I B, Gornushkin, K, Amponsah-Manager, B W, Smith, N, Omenetto, J D, Winefordner   +4 more
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Influence of Preliminary Electron Feeding on Breakdown of Air by Laser

Advanced Solid-State Photonics, 2009
We examined the influence of preliminary feeding of electrons from the small breakdown produced by the femtosecond laser pulse into the breakdown produced by nanosecond laser pulse. We also observed the patterns of plasma emissions.
Hirohide Furutani, Keita Kawana, Naoya Shimomura, Makihito Nishioka, Eiichi Takahashi   +4 more
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Preliminary observations on the breakdown of coir in soil

Plant and Soil, 1979
Coco fibres are used as a wrapper of plastic drain pipes. An investigation has been made of the decomposition of these fibres in soil. Unaffected and partly decayed fibres were washed and placed on cellulose-containing agar plates. Unaffected coir rarely showed growth. Around the partly decayed fibres nearly always fungi developed.
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The breakdown of wood in the side arm of a large river: Preliminary investigations

SIL Proceedings, 1922-2010, 1991
(1991). The breakdown of wood in the side arm of a large river: Preliminary investigations. SIL Proceedings, 1922-2010: Vol. 24, No. 3, pp. 1785-1788.
Hassan Chergui, Eric Pattee
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Temporal and Spatial Characteristics of Preliminary Breakdown Pulses in Intracloud Lightning Flashes [PDF]

Journal of Geophysical Research D: Atmospheres, 2019
Abstract We have studied the temporal and spatial characteristics of preliminary breakdown (PB) pulses in 32 normal intracloud flashes recorded by a fast antenna lightning mapping array system called Fast Antenna Lightning Mapping Array.
Daohong Wang, Dongdong Shi, Ting Wu
exaly   +2 more sources

Preliminary evaluation of laser induced breakdown spectroscopy for slurry samples

Spectrochimica Acta Part B: Atomic Spectroscopy, 2009
Abstract Laser-induced breakdown spectroscopy (LIBS) was applied to the analysis of simulant slurry samples used in the vitrification process of liquid radioactive wastes. A spectroscopic analysis was performed by two different detection systems: Czerny-Turner spectrometer coupled with intensified diode array detector (IDAD) and an Echelle ...
Seong Yong Oh, Fang Yu Yueh, Jagdish P. Singh, Connie C. Herman, Kristine Zeigler   +4 more
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Preliminary Breakdown Pulses of Cloud-to-Ground Lightning in Winter Thunderstorms in Japan

Journal of Atmospheric and Solar-Terrestrial Physics, 2013
Abstract Preliminary breakdown pulses (PBP) of 26 positive and 104 negative cloud-to-ground (CG) lightning flashes observed in winter thunderstorms in Hokuriku region of Japan are analyzed. Pulses in PBP train are mainly bipolar. Zero-crossing time of each pulse is about 7 us and total duration of each pulse train is about 1 ms.
Tomoo Ushio, Tsuyoshi Funaki, Satoru Yoshida   +2 more
exaly   +2 more sources