We theoretically propose and experimentally generate the nondiffracting Bessel-Poincaré beams whose Stokes vortices radially accelerate during propagation. To this end, we design the Bessel beams whose intensity is specified to be uniformly distributed along the longitudinal direction. By superposing two such Bessel beams having different helical phases and mutually orthogonal polarizations, the synthesized vector beam is endowed with the polarization singularity that can rotate about the optical axis, while the total intensities maintain their profiles. Radially self-accelerating Stokes vortices in the resulting beam can be manipulated by adjusting the predefined parameters in the constituent beams.
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http://dx.doi.org/10.1364/AO.438218 | DOI Listing |
Commun Math Phys
April 2024
Department of Mathematics, Tulane University, New Orleans, LA 70118 USA.
We prove that all Galerkin truncations of the 2d stochastic Navier-Stokes equations in vorticity form on any rectangular torus subjected to hypoelliptic, additive stochastic forcing are chaotic at sufficiently small viscosity, provided the frequency truncation satisfies . By "chaotic" we mean having a strictly positive Lyapunov exponent, i.e.
View Article and Find Full Text PDFMicrosyst Nanoeng
December 2024
School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai, 200237, China.
Langmuir
December 2024
School of Mechanical Engineering, Dalian University of Technology, Dalian 116024, China.
J Geophys Res Oceans
November 2024
College of Earth Ocean, and Atmospheric Sciences Oregon State University Corvallis OR USA.
Wind over the ocean generates near-inertial velocities. In the open ocean, horizontal variability in the inertial frequency and mesoscale vorticity generate internal waves that transport energy laterally and drive diapcynal mixing in remote locations. In the coastal ocean, horizontal variability is produced by the coastline.
View Article and Find Full Text PDFMembranes (Basel)
October 2024
Membrane Institute, Kuban State University, Stavropolskaya 149, Krasnodar 350040, Russia.
Pulsed electric field (PEF) modes of electrodialysis (ED) are known for their efficiency in mitigating the fouling of ion-exchange membranes. Many authors have also reported the possibility of increasing the mass transfer/desalination rate and reducing energy costs. In the literature, such possibilities were theoretically studied using 1D modeling, which, however, did not consider the effect of electroconvection.
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