Results 1 to 10 of about 1,095,168 (305)
Radiation Pattern Reconfigurable FM Antenna [PDF]
Journal of Physics: Conference Series, 2019 Abstract In this work, a radiation pattern reconfigurable antenna design using compact printed spiral monopoles that operates at 102 MHz is reported. The proposed antenna changes its radiation behaviour that responds towards a desired direction with the use of RF switches.
Jaya Bharath Gopalakrishnan +10 more
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The Safety of COVID-19 Vaccinations—We Should Rethink the Policy
Vaccines, 2021 Background: COVID-19 vaccines have had expedited reviews without sufficient safety data. We wanted to compare risks and benefits. Method: We calculated the number needed to vaccinate (NNTV) from a large Israeli field study to prevent one death.
Harald Walach +2 more
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Deep learning for terahertz image denoising in nondestructive historical document analysis
Scientific Reports, 2022 Historical documents contain essential information about the past, including places, people, or events. Many of these valuable cultural artifacts cannot be further examined due to aging or external influences, as they are too fragile to be opened or ...
Balaka Dutta +11 more
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Remote Sensing, 2023 This article discusses the methods and results of assessing the angular resolution and sounding depth of enhanced-power ground penetration radars obtained during archaeological and geographical expeditionary works in various natural areas.
Pavel Morozov +4 more
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Вестник Дагестанского государственного технического университета: Технические науки, 2022 Objective. The aim of the study is to build and optimize a computer model of the antenna using software packages for electrodynamic modeling.Method. The study is based on dynamic modeling methods.Result. In this paper, the dependences of the width of the
S. A. Ibragimov
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Taguchi-RBF Neural networks Based Optimization of Phased Array Antenna With Coupling Effects
Advanced Electromagnetics, 2023 In the antenna array synthesis problems, most of the works in literature utilize isotropic elements. Thus, the mutual coupling effects between the array elements are neglected.
K. Oureghi +5 more
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THE STATE OF DIPOLE, DIELECTRIC AND PLASMA ANTENNAS DEVELOPMENT IN THE CONTEXT OF HISTORICAL EVOLUTION OF ANTENNA SYSTEMS [PDF]
Радиофизика и электроника, 2016 The present paper analyses the period of birth and development of science and technology of dipole antennas with reactive and complex loads, microwave dielectric and plasma antennas, as well as dipole and helical electrically small antennas, multi ...
V. V. Ovsyanikov
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Dynamic patterns of adaptive radiation [PDF]
Proceedings of the National Academy of Sciences, 2005 Adaptive radiation is defined as the evolution of ecological and phenotypic diversity within a rapidly multiplying lineage. When it occurs, adaptive radiation typically follows the colonization of a new environment or the establishment of a “key innovation,” which opens new ecological niches and/or new paths for evolution.
Sergey, Gavrilets, Aaron, Vose
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Физика волновых процессов и радиотехнические системы, 2021 Exact mathematic models were developed for traveling wave antennas with a constant slot width based on the dyadic Green function, taking into account both the main and cross-polarization components of the field in the far radiation zone.
Eugeniy I. Nefyodov +3 more
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First-principles method for high-$Q$ photonic crystal cavity mode calculations [PDF]
, 2012 We present a first-principles method to compute radiation properties of ultra-high quality factor photonic crystal cavities. Our Frequency-domain Approach for Radiation (FAR) can compute the far-field radiation pattern and quality factor of cavity modes $
Akahane +29 more
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