Results 101 to 110 of about 6,368 (219)

The Efficiency of Linear Signal Processing in High Frequency Communication Systems for Multipath Ionospheric Propagation Environment

Известия высших учебных заведений России: Радиоэлектроника, 2016
The architecture of digital High Frequency (HF) data modem is considered. Link level simulation of HF wireless communication system with bandwidth of 3 kHz was carried out for the multipath ionospheric channel model.
A. V. Elokhin, V. T. Ermolayev, O. D. Kosymov, D. P. Serebryakova, S. A. Tiraspolsky, A. G. Flaksman   +5 more
doaj  

Ionosphere response to the impact of an extraordinary radio wave when located at a frequency close to the heating frequency

Solar-Terrestrial Physics
The paper presents the results of experiments on the impact of powerful high-frequency radio emission from the SURA mid-latitude heating facility (56.1° N, 46.1° E) on Earth's ionosphere.
Bahmetieva Nataliya, Grigoriev Gennadiy, Zhemyakov Ilia, Kalinina Elena, Lisov Aleksander   +4 more
doaj   +1 more source

Lobachevsky crystallography made real through carbon pseudospheres

, 2016
We realize Lobachevsky geometry in a simulation lab, by producing a carbon-based energetically stable molecular structure, arranged in the shape of a Beltrami pseudosphere.
Taioli, Simone, Iorio, Alfredo, Pugno, Nicola Maria, Gabbrielli, Ruggero, Simonucci, Stefano   +4 more
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LAGERR'S TRANSFORMATIONS IN PSEUDOEUCLIDEAN SPACES AND GEOMETRY OF LOBACHEVSKY

, 1992
Analogs of Lagerr's transformations in ideal regions of a plane and three-dimensional space of Lobachevsky are considered in the paper aiming at the investigation of Lagerr's transformation analogs in an ideal region of a Lobachevsky's plane in the ...
Shustova, Xenia Petrovna
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Lobachevsky’s geometry [PDF]

Bulletin of the American Mathematical Society, 1900
openaire   +3 more sources

Another extension of Lobachevsky’s formula

Elemente der Mathematik, 2022
openaire   +2 more sources

Did Lobachevsky have a model of his Imaginary geometry? [PDF]

, 2008
Lobachevsky's Imaginary geometry in its original form involved an extension of rather than a radical departure from Euclidean intuition. It wasn't anything like a formal theory in Hilbert's sense and hence didn't require anything like a model.
Rodin, Andrei
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Leaders discussion of the USSR, USA and Great Britain about the place and time of the Trilateral meeting in 1943

Juvenis Scientia, 2019
The article is devoted to the study of the process of preparation of the Tehran conference of leaders of the USSR, USA and Great Britain, held in the Iranian capital from November 28 to December 1, 1943.
M. S. Sukhanov, A. N. Garashchenkova
doaj   +1 more source

Lorentzian distance on the Lobachevsky plane ^*

Nonlinearity
Abstract Left-invariant Lorentzian structures on the 2D solvable non-Abelian Lie group are studied. Sectional curvature, attainable sets, Lorentzian length maximizers, distance, spheres, and infinitesimal isometries are described.
openaire   +3 more sources

On the path integral in imaginary Lobachevsky space

, 1993
The path integral on the single-sheeted hyperboloid, i.e. in D-dimensional imaginary Lobachevsky space, is evaluated. A potential problem which we call 'Kepler-problem', and the case of a constant magnetic field are also discussed.
Deutsches Elektronen-Synchrotron (DESY), Hamburg (Germany), Grosche, C. (Hamburg Univ. (Germany). 2. Inst. fuer Theoretische Physik)   +1 more
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