المؤلفون: Mónica Benito, Michael Niklas, Sigmund Kohler

المصدر: Digital.CSIC. Repositorio Institucional del CSIC
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مصطلحات موضوعية: Physics, 73.23.Hk, Trace (linear algebra), Condensed Matter - Mesoscale and Nanoscale Physics, 42.50.Lc, Computation, ddc:530, FOS: Physical sciences, Markov process, 530 Physik, Interference (wave propagation), 01 natural sciences, 010305 fluids & plasmas, symbols.namesake, Operator (computer programming), 05.60.Gg, Mesoscale and Nanoscale Physics (cond-mat.mes-hall), 0103 physical sciences, Master equation, Statistics, symbols, 010306 general physics, Adiabatic process, Numerical stability

الوصف: We develop a scheme for the computation of the full-counting statistics of transport described by Markovian master equations with an arbitrary time dependence. It is based on a hierarchy of generalized density operators, where the trace of each operator yields one cumulant. This direct relation offers a better numerical efficiency than the equivalent number-resolved master equation. The proposed method is particularly useful for conductors with an elaborate time-dependence stemming, e.g., from pulses or combinations of slow and fast parameter switching. As a test bench for the evaluation of the numerical stability, we consider time-independent problems for which the full-counting statistics can be computed by other means. As applications, we study cumulants of higher order for two time-dependent transport problems of recent interest, namely steady-state coherent transfer by adiabatic passage and Landau-Zener-St\"uckelberg-Majorana interference in an open double quantum dot.
Comment: 7 pages, 5 figures

وصف الملف: application/pdf

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7035f1fb753480e1c42e85509cf109a7Test
https://opus.bibliothek.uni-augsburg.de/opus4/frontdoor/index/index/docId/104288Test

المؤلفون: Hadrian Renaldo O. Aquino, David Connelly, Gary H. Bernstein, Alexei O. Orlov, Jonathan Chisum, Wolfgang Porod

المصدر: IEEE Transactions on Magnetics. 58:1-5

مصطلحات موضوعية: 010302 applied physics, Diffraction, Frequency response, Materials science, business.industry, Coplanar waveguide, Physics::Optics, Interference (wave propagation), 01 natural sciences, 7. Clean energy, Electronic, Optical and Magnetic Materials, law.invention, Transducer, law, Spin wave, 0103 physical sciences, Optoelectronics, Electrical and Electronic Engineering, business, Waveguide, Microwave

الوصف: Spin waves are an emerging alternative to electrical signals for high-speed computing. One approach to realizing spin-wave computing devices is to make use of the diffraction and interference of spin waves in a magnetic thin film. This new class of device requires spin wave transducers that operate across a relatively wide bandwidth. Coplanar-waveguide-based transducers would typically be unsuitable for this application due to their comb-like frequency response. Our simulations show that if the coplanar waveguide is placed to the side of the edge of a magnetic film, the frequency response is greatly improved at the expense of peak transducer efficiency. We also found that the coplanar waveguide on top of the film with an etched gap in the film to the side of the waveguide can be a more efficient transducer for shorter decay lengths.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::de58fc44cae15d215cd351c8eaded1abTest
https://doi.org/10.1109/tmag.2021.3084097Test

المؤلفون: Kamran Avanaki, Leila Mohammadi, Hamid Behnam, Jahan Tavakkoli

المصدر: Biomed Opt Express

مصطلحات موضوعية: Physics, 0303 health sciences, Wave propagation, Acoustics, Phase (waves), Acoustic wave, Iterative reconstruction, 01 natural sciences, Article, Atomic and Molecular Physics, and Optics, Imaging phantom, Similitude, 010309 optics, 03 medical and health sciences, Skull, Amplitude, medicine.anatomical_structure, 0103 physical sciences, medicine, 030304 developmental biology, Biotechnology

الوصف: Skull bone represents a highly acoustical impedance mismatch and a dispersive barrier for the propagation of acoustic waves. Skull distorts the amplitude and phase information of the received waves at different frequencies in a transcranial brain imaging. We study a novel algorithm based on vector space similarity model for the compensation of the skull-induced distortions in transcranial photoacoustic microscopy. The results of the algorithm tested on a simplified numerical skull phantom, demonstrate a fully recovered vasculature with the recovery rate of 91.9%.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::95dc3d545eef5f9f296d66fe26827da3Test
https://doi.org/10.32920/21842481Test

المؤلفون: Geetika Gupta, Baljeet Singh

المصدر: Indian Journal of Physics. 95:2405-2410

مصطلحات موضوعية: 010302 applied physics, Physics, Wave propagation, Plane (geometry), 0103 physical sciences, Flexoelectricity, Plane wave, General Physics and Astronomy, Wavenumber, Mechanics, Strain gradient, 01 natural sciences, Plane wave propagation

الوصف: In this paper, we specialize the governing equations of microstructured flexoelectric solids in a plane and solve for possible plane wave propagation. It is shown that there exist two plane waves, namely quasi-P and quasi-SV waves, in a microstructured flexoelectric solid half-space. A numerical example is considered to plot the speeds of quasi-P and quasi-SV waves against the wave number for given propagation angle. The speeds of quasi-P and quasi-SV waves are also computed against the angle of propagation for given wave number. The micro-inertial, strain gradient elastic, and flexoelectric effects on plane wave speeds are illustrated graphically.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::8463ae853c7c670d78e1211d072c9de7Test
https://doi.org/10.1007/s12648-020-01905-1Test

المؤلفون: Anand Kumar Yadav

المصدر: Journal of Ocean Engineering and Science, Vol 6, Iss 4, Pp 376-388 (2021)

مصطلحات موضوعية: Physics, Void (astronomy), Environmental Engineering, Condensed matter physics, Micropolar, Wave propagation, Void, Fractional-order thermoelasticity, Plane wave, Ocean Engineering, Context (language use), Plane-wave, Thermodiffusion, Oceanography, 01 natural sciences, 010305 fluids & plasmas, Transverse plane, Thermoelastic damping, 0103 physical sciences, Diffusion (business), Initial stress, TC1501-1800, 010301 acoustics, Displacement (fluid)

الوصف: The research article is the analysis of wave propagation in an initially stressed micropolar fractional-order derivative thermoelastic diffusion medium with voids. The governing equations in the context of generalized fractional-order derivative thermo-elasticity are formulated and the velocity equations are obtained. The plane wave solution of these equations indicates the existence of six plane waves, namely coupled longitudinal displacement ( c L ), coupled thermal ( c T ), coupled mass diffusion ( c M D ), coupled longitudinal void volume fraction ( c V ), coupled transverse displacement ( c T D ), and coupled transverse micro-rotational ( c T M ) waves. The sets of coupled waves ( c L ), ( c T ), ( c M D ) and ( c V ) are found to be dispersive, attenuating and influenced by the presence of thermal, diffusion and voids parameters in the medium. The speeds of coupled transverse displacement ( c T D ), and coupled transverse micro-rotational ( c T M ) waves are not affected by thermal, diffusion and void parameters. The speeds of the plane waves, c L , c T , c M D , and c V are computed for a particular material and plotted against the thermal parameter, frequency, initial stress, diffusion and void parameters.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e48e8bb488f56d39a266b0635cbcad82Test
https://doi.org/10.1016/j.joes.2021.04.001Test

المؤلفون: Yuri S. Kivshar, Roman S. Savelev, D. F. Kornovan, Mihail Petrov

المصدر: ACS Photonics. 8:3627-3632

مصطلحات موضوعية: Physics, Order (ring theory), 02 engineering and technology, 021001 nanoscience & nanotechnology, Interference (wave propagation), 01 natural sciences, Atomic and Molecular Physics, and Optics, Electronic, Optical and Magnetic Materials, Resonator, Dipole, Quality (physics), Quantum mechanics, 0103 physical sciences, Radiative transfer, Electrical and Electronic Engineering, 010306 general physics, 0210 nano-technology, Biotechnology

الوصف: We introduce a novel physical mechanism for achieving giant quality factors ($Q$-factors) in finite-length periodic arrays of subwavelength optical resonators. The underlying physics is based on interference between the band-edge mode and another standing mode in the array, and the formation of spatially localized states with dramatically suppressed radiative losses. We demonstrate this concept for an array of $N$ dipoles with simultaneous cancellation of multipoles up to $N$-th order and the $Q$ factor growing as $Q \propto N^{\alpha}$, where $\alpha \gtrsim 6.88$. Based on this finding, we propose a realistic array of Mie-resonant nanoparticles ($N \lesssim 29$) with a dramatic enhancement of the Purcell factor (up to $\sim $3400) achieved by tuning of the array parameters.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::06410a25ee9e82b251416ab9eedf988bTest
https://doi.org/10.1021/acsphotonics.1c01262Test

المؤلفون: Marek Dobosz, Michał Jankowski

المصدر: Precision Engineering. 72:250-258

مصطلحات موضوعية: 010302 applied physics, Physics, business.industry, Astrophysics::Instrumentation and Methods for Astrophysics, General Engineering, Interference (wave propagation), 01 natural sciences, Displacement (vector), Metrology, 010309 optics, Interferometry, Optics, 0103 physical sciences, Range (statistics), Measurement uncertainty, Constant (mathematics), business, Laser beams

الوصف: A design of a new, absolute sensor for measurement of an angular micro-displacement is presented. In this sensor deflections of incident laser beam generate changes of the constant of the interference fringes that are created by the double arm special interferometer. Fringe constant is determined using a CCD camera and proposed analysis algorithms. Sensor's operating principle and metrological properties are presented. Sensor was tested using reference interferometer. Obtained measurement uncertainty is equal to ±10 μrad in the multi-milliradian range. The concept of a two-sensor system for increasing twice the measuring range is presented.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::2bea5f33a841e40475b7b1c09a276066Test
https://doi.org/10.1016/j.precisioneng.2021.04.018Test

المؤلفون: Stefan A. Sauter, Céline Torres

المصدر: Asymptotic Analysis. 125:289-325

مصطلحات موضوعية: Physics, Helmholtz equation, Wave propagation, General Mathematics, Operator (physics), 010102 general mathematics, Mathematical analysis, 01 natural sciences, Stability (probability), Green S, chemistry.chemical_compound, chemistry, Frequency domain, 0103 physical sciences, Circular symmetry, 0101 mathematics, 010306 general physics, Focus (optics)

الوصف: We study wave propagation phenomena modelled in the frequency domain by the Helmholtz equation in heterogeneous media with focus on media with discontinuous, highly oscillating wave speed. We restrict to problems with spherical symmetry and will derive explicit representations of the Green’s operator and stability estimates which are explicit in the frequency and the wave speed.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::f7beaac2abccc4ebf181bf44b8836a42Test
https://doi.org/10.3233/asy-201657Test

المؤلفون: Ue-Li Pen, Robert Main, Jing Luo, Fang Xi Lin, Hsiu-Hsien Lin, Marten H. van Kerkwijk, James Mckee, D. Simard

المصدر: Monthly Notices of the Royal Astronomical Society. 508:1115-1127

مصطلحات موضوعية: Physics, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Astronomy and Astrophysics, Astrophysics, Interference (wave propagation), 01 natural sciences, Measure (mathematics), law.invention, Pulse (physics), Amplitude, Pulsar, 13. Climate action, Space and Planetary Science, Achromatic lens, law, 0103 physical sciences, Dispersion (optics), Baseband, 010303 astronomy & astrophysics

الوصف: Propagation effects in the interstellar medium and intrinsic profile changes can cause variability in the timing of pulsars, which limits the accuracy of fundamental science done via pulsar timing. One of the best timing pulsars, PSR J1713+0747, has gone through two ‘dip’ events in its dispersion measure (DM) time series. If these events reflect real changes in electron column density, they should lead to multiple imaging. We show that the events are well fitted by an underdense corrugated sheet model, and look for associated variability in the pulse profile using principal component analysis. We find that there are transient pulse profile variations, but they vary in concert with the DM, unlike what is expected from lensing due to a corrugated sheet. The change is consistent in shape across profiles from both the Green Bank and Arecibo radio observatories, and its amplitude appears to be achromatic across the 820-MHz, 1.4-GHz, and 2.3-GHz bands, again unlike expected from interference between lensed images. This result is puzzling. We note that some of the predicted lensing effects would need higher time and frequency resolution data than used in this analysis. Future events appear likely, and storing baseband data or keeping multiple time–frequency resolutions will allow more in-depth study of propagation effects and hence improvements to pulsar timing accuracy.

وصف الملف: application/pdf

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::789bb26c8021b37b05e44bd1b230e619Test
https://doi.org/10.1093/mnras/stab2529Test

المؤلفون: Mengtao Wu, Zhenning Ba, Jianwen Liang, Qiaozhi Sang

المصدر: Applied Mathematical Modelling. 97:206-225

مصطلحات موضوعية: Materials science, Wave propagation, Applied Mathematics, Isotropy, Poromechanics, Geometry, 02 engineering and technology, 01 natural sciences, Seismic wave, Physics::Geophysics, symbols.namesake, 020303 mechanical engineering & transports, Fourier transform, 0203 mechanical engineering, Transverse isotropy, Modeling and Simulation, 0103 physical sciences, symbols, Reflection (physics), 010301 acoustics, Matrix method

الوصف: This paper proposed a reflection-transmission matrix method to solve the time-history response of a layered transversely isotropic (TI) saturated site subjected to obliquely incident seismic waves. Based on Biot's theory of wave propagation in a TI poroelastic medium, the displacement, stress and pore pressure components are derived in the frequency domain using the boundary and continuity conditions of the layered half-space. By employing inverse Fourier transform and convolution theorem, time-domain solution for the site response under earthquake excitation is given. The methodology is implemented by the numerical platform FORTRAN, and is verified through comparison with degenerated solution for a layered isotropic single-phase case. Taking single-layered and multi-layered half-space as the examined models respectively, the time-history response of the stratified TI saturated site under obliquely incident seismic waves are presented and parameters studies are performed. Numerical results illustrate that the TI parameters, earthquake excitation, incident angle, and layering sequence have significant important influence on the seismic responses. The presented solutions can provide effective reference for studying the input ground motion and seismic soil-structure interaction concerning specially the layered TI saturated site.

الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::cb9caf8e3a36e6902dee76faf90d66a2Test
https://doi.org/10.1016/j.apm.2021.03.052Test