Results 31 to 40 of about 1,764,811 (237)
Why does gravitational radiation produce vorticity? [PDF]
, 2007 We calculate the vorticity of world--lines of observers at rest in a Bondi--Sachs frame, produced by gravitational radiation, in a general Sachs metric.
A Di Prisco +11 more
core +2 more sources
Formation of an elongated region of energy backflow using ring apertures [PDF]
Компьютерная оптика, 2019 In this paper, we have investigated the focusing of a second-order cylindrical vector beam by using a high numerical aperture (NA) lens limited by a ring aperture using the Richards-Wolf formulae.
Sergey Stafeev, Victor Kotlyar
doaj +1 more source
Nonadditivity of Poynting vector within opaque media [PDF]
Journal of the Optical Society of America A, 2005 The energy flux within an opaque medium near an interface is not the sum of an incident plus a reflected term, as there is a synergistic contribution to the time-averaged Poynting vector that involves simultaneously both the incident and reflected fields.
Guillermo P, Ortiz, W Luis, Mochán
openaire +2 more sources
Properties of the Poynting vector for invariant beams: Negative propagation in Weber beams [PDF]
, 2018 Negative propagation is an uncommon response produced by the local sign change in Poynting vector components. We present a general Poynting vector expression for all invariant beams with cylindrical symmetry using scalar potentials in order to evaluate ...
I. Rondón, F. Soto‐Eguibar
semanticscholar +1 more source
Energies, 2020 Reservoir parameter estimation is one of the goals of amplitude-versus-angle (AVA) inversion and angle-domain common image gathers are the basis of AVA inversion.
Zhe Yan, Yonglong Yang, Shaoyong Liu
doaj +1 more source
Frequency dependent power and energy flux density equations of the electromagnetic wave
Results in Physics, 2017 The calculation of the power and energy of the electromagnetic wave is important for numerous applications. There are some equations to compute the power and energy density of the electromagnetic wave radiation.
M. Muhibbullah +2 more
doaj +1 more source
Sonic booms and diffusion wakes generated by a heavy quark in thermal AdS/CFT [PDF]
, 2007 We evaluate the Poynting vector generated by a heavy quark moving through a thermal state of N=4 gauge theory using AdS/CFT. A significant diffusion wake is observed as well as a Mach cone. We discuss the ratio of the energy going into sound modes to the
Gubser, Steven S. +2 more
core +1 more source
Educación Química, 2018 John Henry Poynting (1852-1914) es conocido por sus trabajos relacionados con la determinación del efecto de la presión sobre los cambios de fase y la presión osmótica (efecto Poynting) ; la determinación de la constante de la gravedad y la densidad ...
Jaime Wisniak
doaj +1 more source
Profile Inversion and Closed Form Formulation of Compact GRIN Lenses
IEEE Open Journal of Antennas and Propagation, 2021 New formulas for the design of cylindrical Graded-Index (GRIN) lens-antennas with integrated feeder are presented. The possibility of integrating the feeder within the lens makes the system more compact, avoids complex mechanical design and alignment ...
Francesca Maggiorelli +4 more
doaj +1 more source
IEEE Open Journal of Antennas and Propagation, 2023 In classical antenna theory, the Thévenin equivalent circuit is a commonly used tool to analyze the characteristics of receiving antennas. However, when dealing with a lossy antenna that is near a large load impedance, this circuit has limitations
Junming Diao, Lu Liu
doaj +1 more source