We investigate the propagation of Airy beams in linear gradient index inhomogeneous media. We demonstrate that by controlling the gradient strength of the medium it is possible to reduce to zero their acceleration. We show that the resulting Airy wave beam propagates in straight line due to the balance between two opposite effects, one due to the inhomogeneous medium and the other to the diffraction of the beam, in a similar way as a solitary wave in a nonlinear inhomogeneous medium. Going even further we were able to invert the sign of the acceleration of the beam.
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http://dx.doi.org/10.1364/OE.19.016448 | DOI Listing |
Materials (Basel)
December 2024
School of Materials Science and Engineering, Chang'an University, Xi'an 710061, China.
Ceramic armor protection with complex shapes is limited by the difficult molding or machining processing, and 3D printing technology provides a feasible method for complex-shaped ceramics. In this study, ZrO ceramics were manufactured by 3D printing accompanied with microwave sintering. In 3D printing, the formula of photosensitive resin was optimized by controlling the content of polyurethane acrylic (PUA) as oligomer, and the photosensitive resin with 50% PUA showed excellent curing performance with a small volume shrinkage of 4.
View Article and Find Full Text PDFNat Commun
January 2025
Center for Physics and Chemistry of Living Systems, Tel Aviv University, Tel Aviv, Israel.
Propagation of membrane tension mediates mechanical signal transduction along surfaces of live cells and sets the time scale of mechanical equilibration of cell membranes. Recent studies in several cell types and under different conditions revealed a strikingly wide variation range of the tension propagation speeds including extremely low ones. The latter suggests a possibility of long-living inhomogeneities of membrane tension crucially affecting mechano-sensitive membrane processes.
View Article and Find Full Text PDFJ Chem Phys
December 2024
Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei 10617, Taiwan.
Based on our previous study [Wang et al., J. Chem.
View Article and Find Full Text PDFJ Magn Reson
December 2024
UNB MRI Research Centre, Department of Physics, University of New Brunswick, Fredericton, New Brunswick E3B 5A3, Canada. Electronic address:
Multinuclear H, C, and Na magnetic resonance (MR) has many advantages for studying porous media systems containing hydrocarbons and brine. In recent work, we have explored changing the nucleus measured, keeping the Larmor frequency constant, by changing the static magnetic field B. Increasing the static B field distorts the field in the pore space due to susceptibility mismatch between the matrix and pore fluid.
View Article and Find Full Text PDFMicrosc Res Tech
November 2024
Institute of Electrophysics UB RAS, Ekaterinburg, Russia.
Analysis of indentation data of heterogeneous material, in particular, layer on an elastic substrate requires information about the contact area that is essential for calculating mechanical properties. The actual shape of the AFM-tip is not described by simple body of revolution. In this work, the indentation of a stiff layer on a hyperelastic substrate by a truncated conical tip is studied using finite element methods.
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