Results 181 to 190 of about 4,370 (195)

Comparative Study on Preliminary Breakdown Pulse Trains Observed in Malaysia and Florida

2010 30th International Conference on Lightning Protection (ICLP), 2010
In this paper, the preliminary breakdown pulse (PBP) trains preceding the negative first return strokes recorded using a broad band antenna system in Johor Bahru, Malaysia and Florida, United States were analyzed. In lightning flashes observed in Malaysia, the ratio between the amplitude of the largest preliminary breakdown pulse (PBP) and the peak ...
M Fernando
exaly   +2 more sources

Propagation of preliminary breakdown pulses preceding cloud-to-ground lightning discharges

2015 1st URSI Atlantic Radio Science Conference (URSI AT-RASC), 2015
A sequence of electromagnetic pulses lasting from a few milliseconds to several tens of milliseconds is usually observed prior to the first return stroke of a cloud-to-ground lightning flash. The sequence is composed of three parts. It begins with a group of relatively large bipolar pulses which are believed to be connected with preliminary breakdown ...
I. Kolmasova, O. Santolik, T. Farges, S. Cummer, R. Lan, L. Uhlir   +5 more
openaire   +1 more source

PRELIMINARY EVIDENCE FOR SELF-FOCUSING IN GAS BREAKDOWN PRODUCED BY PICOSECOND LASER PULSES

Applied Physics Letters, 1969
An investigation of the sparks produced by picosecond pulses from mode-locked Nd:glass and ruby lasers indicates the existence of breakdown regions of diameter less than 5 μ. These results support the hypothesis that self-focusing of the beam may be involved in the breakdown process.
A. J. Alcock, C. DeMichelis, V. V. Korobkin, M. C. Richardson   +3 more
openaire   +1 more source

A Survey of Measurements and Analyses of Preliminary Breakdown Pulses in Lightning Flashes

2025 IEEE International Conference on Environment and Electrical Engineering and 2025 IEEE Industrial and Commercial Power Systems Europe (EEEIC / I&CPS Europe)
Lightning represents a major hazard to humans, buildings, electrical and electronic installations. To date, the majority of investigations have concentrated on the Return Stroke (RS) phase of the lightning flash. Nonetheless, a significant gap persists in the comprehension of RS antecedents, particularly Preliminary Breakdown (PB) pulses, which ...
Barmada, Sami, Bonfiglio, Andrea, Brignone, Massimo, Dodge, Shayan, Formisano, Alessandro, Procopio, Renato, Sekehravani, Ehsan Akbari   +6 more
openaire   +2 more sources

Measurement of Preliminary Breakdown Pulse Trains in Cloud-to-Ground Lightning Using Lightning Locating Systems

2014 International Conference on Lightning Protection (ICLP), 2014
The first stroke leader in a cloud-to-ground lightning discharge is thought to be preceded by the initial or preliminary breakdown process which produces a train of relatively large microsecond-scale electric field pulses. In addition to producing the information used to geolocate various types of lightning events (cloud-to-ground return strokes, M ...
Vladimir A Rakov, Nag, Amitabh, Martin J Murphy   +2 more
exaly   +2 more sources

Characterization of Electric Fields Produced by Preliminary Breakdown Pulses Observed in Bogotá, Colombia

2019
In this paper, the characteristics of electric fields due to preliminary breakdown pulses (PBP) that precede the first return strokes (FRS) are presented. These pulses exist due to the electrical activity formed inside the clouds prior to the occurrence of the stepped leader.
C. A. Granados, H. E. Rojas, C. A. Rivera, F. J. Román   +3 more
openaire   +1 more source

Statistical analysis on preliminary breakdown pulses in negative cloud-to-ground flashes occurred in Colombia

2021 35th International Conference on Lightning Protection (ICLP) and XVI International Symposium on Lightning Protection (SIPDA), 2021
Camilo A. Granados, Herbert E. Rojas, Francisco J. Roman   +2 more
openaire   +1 more source

Spectral domain analysis of preliminary breakdown pulse train activity during leader electric field signatures of positive cloud-to-ground flash incidents recorded during 2019 thunderstorm season in central part of Poland

Electric Power Systems Research, 2023
G. Karnas, G. Maslowski, P. Baranski, W. Gajda   +3 more
openaire   +1 more source

Investigation of Non-Identical Polarity of Lightning Preliminary Breakdown Pulse Train to That of Negative First Return Pulse in Malaysia

International Journal of Simulation: Systems, Science & Technology, 2016
openaire   +1 more source

Preliminary Report of the National Cancer Data Base

Ca-A Cancer Journal for Clinicians, 1991
Herman R Menck, L Garfinkel
exaly