Results 1 - 10 of 3290
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[en] This paper presents a calculation of IEMP cable current response due to gamma rays in a source region environment. The obvious relationship between this problem and X-ray IEMP for satellites is discussed, and the nonlinear effects of air conductivity are investigated
[en] The invention deals with a cable where the cable core is surrounded by especially prepared layers for protection against electromagnetic pulses caused by nuclear explotions. The first layer is prepared for a bottom level disruptive voltage of 8 kV for the endurance of the dose rate 1010 rad/s without reduction of this voltage to less than the half. For sufficient reflection and weakening of induced voltage, a typical embodiment of the second layer is a metal screen having a maximum lengthwise resistance of 7.10-5 ohm/m. The minimum conductance to earth of a surrounding corrosion resistant layer is 10-3 siemens/m
[en] Complete text of publication follows. Powerful lightning flashes with large return stroke peak currents induce energetic and electrical coupling between the troposphere and the upper atmosphere via the quasi-electrostatic and/or the radiated electromagnetic pulse (EMP). Several researchers have suggested that the lightning EMP which drives ELVES may be a significant source of variation in the upper atmosphere at regional and global scales. In addition, 'big' lightning is more loosely associated with other Transient Luminous Events (TLEs) and are linked to Terrestrial Gamma-ray Flashes (TGFs). Global lightning provides context on the activity levels of thunderstorm systems, assisting studies into TLEs, TGFs, meteorology and atmospheric electricity in general. One of the few experiments which can currently provide such observations is the multi-station World Wide Lightning Location Network (WWLLN). The WWLLN-stations measure the very low frequency (VLF; 3-30 kHz) radiation from lightning discharges. Propagation at these very long electromagnetic wavelengths (up to 100 km) allows lightning strokes to be located in real time at up to 10,000 km from the receivers with a location accuracy that is estimated to be ∼10-20 km, and sometimes better than this. True global mapping of lightning from widely spaced (a few Mm) ground-based receivers requires the use of frequencies <30 kHz. Lightning impulses in this frequency range suffer low propagation attenuation, and hence propagation in the Earth-ionosphere waveguide is possible over global distances. In April 2009 we introduced a new algorithm for reprocessing WWLLN observations, leading to an increase in locations by a factor of 2.7. In this talk I hope to discuss our most recent efforts to produce new, smarter algorithms leading to DE improvements. I will also summarise the current state of the WWLLN, during a phase of significant station growth.
[en] d’Alembert equation written for the electromagnetic waves propagating in the graphene superlattice is analyzed. The possibility of the propagation of the solitary electromagnetic waves in the graphene superlattice is discussed. The amplitude and the width of the electromagnetic pulse are calculated. The drag current induced by such wave across the superlattice axis is investigated. The numerical estimate of the charge dragged by the solitary wave is made.
[en] This article discusses conservation laws in the electrodynamics of dissipative continuous media, with particular emphasis on the electric area conservation rule for electromagnetic pulses and its application to short pulse propagation problems in resonant media. (methodological notes)
[en] It is shown that a new postnewton (PN) parameter τ affect sufficiently the dynamic characteristics of moving bodies in binary star system. Parameter τ reflects the noninertial character of the movement of standard parametrized PN-system with respect to quasilorentz reference system. Method for determination of numerical τ value, using data of PSR 1913-16 binary pulsar observations is suggested. 5 refs
[en] The VAN method has already been successfully used to predict numerous earthquakes. It is now gaining in credibility thanks to a theory that might explain the basic phenomenon involved
[fr]La methode VAN a deja permis de prevoir de nombreux seismes. Elle gagne aujourd'hui en credibilite grace a une theorie qui en expliquerait le phenomene physique de base
[en] Theoretical approaches to the formation and propagation of soliton-like broadband electromagnetic and acoustic pulses with terahertz frequencies in condensed media are reviewed. Solitons of different types are analyzed and controlling their parameters by modifying the nonlinear medium is discussed. Nonlinear molecular excitations in biopolymers whose frequencies fall into the terahertz range are considered, and their interactions with external fields of resonant frequencies are discussed.