نتایج جستجو برای: lightning

تعداد نتایج: 6387  

Journal: :NeuroRehabilitation 2005
Michael Cherington

As a force of pure power and magnificence, nothing in nature surpasses lightning. As a force of importance to the workings and achievements of modern civilization, nothing outranks electricity. Both lightning and electricity, however, can be extremely dangerous and can cause devastating injuries. In recent years, there have been significant advances in the arenas of trauma and rehabilitation th...

2007
Zhenggang Cheng Steven A. Cummer Han-Tzong Su Rue-Ron Hsu

[1] Prompt early/fast perturbations on narrowband sub-ionospherically propagating very low frequency (VLF) signals are the primary evidence for the direct coupling of energy released by lightning discharge to the lower ionosphere. Different mechanisms have been advanced to explain the fast ionospheric perturbations, such as heating and ionization from the lightning electromagnetic pulse (EMP) a...

2009
R. B. Rodrigues J.P.S. Catalão

This paper is concerned with lightning surge propagation on wind turbines. As wind power generation undergoes rapid growth, lightning incidents involving wind turbines have come to be regarded as a serious problem. Nevertheless, no known studies exist yet in Portugal regarding lightning protection of wind turbines. In this paper we present an overview of Electro-Magnetic Transients Program (EMT...

2010
R. B. Rodrigues J.P.S. Catalão

This paper is concerned with lightning surge propagation on wind turbines. As wind power generation undergoes rapid growth, lightning incidents involving wind turbines have come to be regarded as a serious problem. Nevertheless, no known studies exist yet in Portugal regarding lightning protection of wind turbines. Hence, we present a case study, based on a wind turbine with an interconnecting ...

2014
Andrew J. Dowdy Yuriy Kuleshov

A climatology of lightning ground flash density is examined for the Australian region based on 18 years of data. The dataset and methodology used are consistent with that of a previous study based on eight years of data. Lightning flash densities are obtained from two satellite instruments—the Lightning Imaging Sensor and the Optical Transient Detector. A climatological map of lightning ground ...

2008
Martin J. Murphy Ronald L. Holle Nicholas W.S. Demetriades

1. Introduction Automated lightning warning systems are a critical component of many day-today operations. This is particularly true of airports but also applies in some industrial applications, such as mining and the manufacture, testing, and handling of explosives and weapons. Many automated lightning warning systems use a combination of lightning detection information and one or more electri...

2008
Masahito Shimizu Shigeru Yokoyama

1 INTRODUCTION Electric power utilities have sustained significant damage from lightning. The occurrence of line faults is one result of lightning damage. To prevent it, power utilities adopt various measures of protection from lightning. Transmission line overhead ground wires greatly contribute to a decrease in the number of line faults by preventing direct hits to the power lines. Lightning ...

2018
B. M. Hare O. Scholten A. Bonardi A. Nelles J. P. Rachen L. Rossetto C. Rutjes P. Schellart T. N. G. Trinh T. Winchen

Lightning mapping technology has proven instrumental in understanding lightning. In this work we present a pipeline that can use lightning observed by the LOw-Frequency ARray (LOFAR) radio telescope to construct a 3D map of the flash. We show that LOFAR has unparalleled precision, on the order of meters, even for lightning flashes that are over 20 km outside the area enclosed by LOFAR antennas ...

2013
L. Chemartin P. Lalande

E-mail: [email protected] T his paper deals with the direct effects of lightning strike on aircraft structures. In a first part, the phenomenology of lightning arc attachment on aircraft is introduced. Some specific features of lightning arcs observed in flight or created in the laboratory are presented. Some recent developments and results from numerical simulations are shown. The sha...

2010
M. Milewski

A lightning return-stroke model, based on the lightning return-stroke current derivative measured at the Toronto CN Tower is presented in this paper. A 3-section transmission line representation of the CN Tower along with the derivative of the modified Heidler function is used to simulate the measured current derivative signal. Reflections from major structural discontinuities of the CN Tower a...

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