Results 11 to 20 of about 13,838,030 (309)

Entropy in the natural time domain [PDF]

open access: yesPhysical Review E, 2004
Published in Physical Review ...
Varotsos, P.A.   +3 more
openaire   +4 more sources

Design of a Six-Port Compact UWB MIMO Antenna With a Distinctive DGS for Improved Isolation

open access: yesIEEE Access, 2022
A low-profile printed six-port ultrawideband (UWB) antenna with a novel decoupling structure for enhancing port-to-port isolation is analyzed in this paper.
Praveen Kumar   +7 more
doaj   +1 more source

Evidence for Multiple Shocks from the γ-Ray Emission of RS Ophiuchi

open access: yesThe Astrophysical Journal, 2023
In 2021 August, the Fermi Large Area Telescope, H.E.S.S., and MAGIC detected GeV and TeV γ -ray emission from an outburst of recurrent nova RS Ophiuchi. This detection represents the first very high-energy γ -rays observed from a nova, and it opens a new
Rebecca Diesing   +6 more
doaj   +1 more source

Finite Element Modelling and Simulation of the Hysteretic ‎Behaviour of Single- and Bi-metal Cantilever Beams using a ‎Modified Non-linear Beta-damping Model [PDF]

open access: yesJournal of Applied and Computational Mechanics, 2021
This paper explores a novel non-linear hysteresis model obtained from the modification of the conventional Kelvin-Voigt model, to produce a non-viscous hysteretic behaviour that is closer to metal damping. Two case studies are carried out for a vibrating
Hamza Tariq   +3 more
doaj   +1 more source

Near-Field Millimeter-Wave Imaging via Multi-Plane MIMO Arrays

open access: yesIEEE Access, 2023
Multiple-input multiple-output (MIMO) array-based millimeter-wave (MMW) imaging has broad application prospects in concealed weapons detection due to its capability of high resolution at a reasonable cost.
Guangnan Xing   +4 more
doaj   +1 more source

Fast finite difference time domain analysis of microstrip patch antennas [PDF]

open access: yes, 1991
Although the finite-difference-time-domain method has been successfully used to model microstrip-fed patch antennas, this has been achieved using uniform grids.
Daniel, EM, Railton, CJ
core   +1 more source

Optical Coherence Tomography (OCT): A Brief Look at the Uses and Technological Evolution of Ophthalmology

open access: yesMedicina, 2023
Medical imaging is the mainstay of clinical diagnosis and management. Optical coherence tomography (OCT) is a non-invasive imaging technology that has revolutionized the field of ophthalmology.
Marco Zeppieri   +7 more
doaj   +1 more source

Vector fitting realisation of exact time domain modal nonreflecting boundary condition [PDF]

open access: yes, 2010
To employ the modal nonreflecting boundary condition (MNRBC) in cylindrical coordinates in the finite element time domain (FETD) method, a time domain kernel expression must be found that it is the inverse Laplace transform (ILT) of a known frequency ...
Bavelis, Konstantinos, Mias, Christos
core   +1 more source

Optomechanical time-domain reflectometry [PDF]

open access: yesNature Communications, 2018
AbstractOptical fibres constitute an exceptional sensing platform. However, standard fibres present an inherent sensing challenge: they confine light to an inner core. Consequently, distributed fibre sensors are restricted to the measurement of conditions that prevail within the core. This work presents distributed analysis of media outside unmodified,
Bashan, Gil   +4 more
openaire   +4 more sources

Amplification pattern of the ground surface including underground circular inclusion subjected to incident SH-waves [PDF]

open access: yesپژوهش‌های زیرساخت‌های عمرانی, 2018
In this paper, amplification pattern of the ground surface was presented in the presence of an underground circular inclusion by a half-plane time-domain boundary element method (BEM).
Mehdi Panji, Farshid Yasemi
doaj   +1 more source

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