Results 1 to 10 of about 7,981,538 (380)
Radiation pattern reconfigurable fm antenna [PDF]
Journal of Physics: Conference Series, 2019 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 ...
Balanis C.A. +16 more
core +2 more sources
About the features of radiation pattern of the symmetric slot antennas in microwave range
Физика волновых процессов и радиотехнические системы, 2017 Features of radiation patterns of antennas on the basis of planar symmetric slot lines of constant width at a frequency of 10 GHz, in the E and H planes in case of change of their length and width were studied.
V.P. Zayarnyi +3 more
doaj +2 more sources
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
doaj +1 more source
IEEE Access, 2023 This work is concerned with a detailed study of an active antenna, which can serve as a prototype of a phased array antenna element for a future lunar very-low-frequency (VLF) radio telescope operating in the frequency range of 1–30 MHz.
Peter L. Tokarsky +2 more
doaj +1 more source
Electric field enhancement and far-field radiation pattern of the nanoantenna with concentric rings. [PDF]
Nanoscale Res Lett, 2014 Chen SW +4 more
europepmc +3 more sources
Deep learning for terahertz image denoising in nondestructive historical document analysis
Scientific Reports, 2022 Historical documents contain essential information about the past, including places, people, or events.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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X-band coaxial monopole antenna with an additional metal screen
Journal of Telecommunications and Information Technology, 2023 The novel coaxial monopole antenna design with an additional metal screen is presented. The radiation char- acteristics of this antenna are investigated depending on a dis- tance between the ground plane and additional metal screens, as well as on a ...
Maksym Khruslov , Vadym Pazynin
doaj +1 more source
Известия высших учебных заведений России: Радиоэлектроника, 2023 Introduction. Phased antenna arrays (PAA) of large geometric dimensions find wide application in various spacecraft systems. The PAA design assumes the deployment of its sections in outer space to form a plane of the radiating aperture.
M. R. Bibarsov +4 more
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CT&F Ciencia, Tecnología & Futuro, 2022 Full Waveform Inversion (FWI) is an optimization method that retrieves high-quality images of the ground's internal electromagnetic properties, such as permittivity, permeability, or conductivity.
Andrés-Fernando Plata-Galvis +3 more
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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
openaire +2 more sources