Results 71 to 80 of about 93,016 (319)

Photochromic Molecules Enable Optical Control of Optomechanical Coupling in a Cavity

Advanced Optical Materials, EarlyView.
An optomechanical system with optically‐tunable coupling is introduced, featuring a multilayered membrane with a photochromic molecule and NIR‐absorbing dye. Laser cooling of a membrane vibrational mode is evidenced, with a 60% improvement in efficiency achieved upon photoisomerization, as well as reversible control of photothermal forces.
Marta Cagetti, Michele Cardelli, Ennio Arimondo, Lorenzo Lavista, Francesca D'Elia, Andrea Camposeo, Dario Pisignano, Donatella Ciampini   +7 more
wiley   +1 more source

A test of the evolution of gas depletion factor in galaxy clusters using strong gravitational lensing systems

European Physical Journal C: Particles and Fields, 2022
In this work, we discuss a new method to probe the redshift evolution of the gas depletion factor, i.e. the ratio by which the gas mass fraction of galaxy clusters is depleted with respect to the universal mean of baryon fraction.
R. F. L. Holanda, Kamal Bora, Shantanu Desai   +2 more
doaj   +1 more source

Mimicking Symmetry‐Breaking Einstein Ring by Optical Lens

Advanced Photonics Research, EarlyView.
This article uses an optical lens to emulate the gravitational lensing effect and observe the Einstein ring (ER) patterns. The symmetry‐breaking ER, i.e., Einstein cross, is observed utilizing a rotation‐symmetry‐breaking hemi‐ellipsoid lens. Deformed Einstein cross patterns induced by noncollinearly alignment of the light source–lens–observer are ...
Jun‐Liang Duan, Wen Xiao, Minyong Guo, Tong Liu, Huanyang Chen, Jin‐Hui Chen   +5 more
wiley   +1 more source

Velocity effects on second order contributions to gravitational frequency shift by a moving Kerr–Newman black hole

European Physical Journal C: Particles and Fields, 2019
The significance of the radial velocity effects on the leading-order gravitational frequency shift in some special cases was reported recently. This paper investigates the gravitational shift of frequency of light propagating in the equatorial plane of a
Guansheng He, Chaohong Pan, Wenbin Lin
doaj   +1 more source

LenSiam: Self-Supervised Learning on Strong Gravitational Lens Images [PDF]

arXiv, 2023
Self-supervised learning has been known for learning good representations from data without the need for annotated labels. We explore the simple siamese (SimSiam) architecture for representation learning on strong gravitational lens images. Commonly used image augmentations tend to change lens properties; for example, zoom-in would affect the Einstein ...
arxiv  

Automated Fabrication of 3D Printed Magnetic Soft Robots With Programmable 3D Magnetizations

Advanced Robotics Research, EarlyView.
An automated 3D printer for fabricating magnetic soft robots is shown to program 3D magnetizations into a composite elastic resin. Printer parameters, such as geometric resolution and deflection angles, are characterized and a fast repeatable production process was demonstrated.
Jackson Sholdice, Kaitlyn Clancy, Karolina Teresinska, Carl Castro, Lauren Watson, Onaizah Onaizah   +5 more
wiley   +1 more source

The Magnification Invariant of Circularly-symmetric Lens Models [PDF]

, 2018
In the context of strong gravitational lensing, the magnification of image is of crucial importance to constrain various lens models. For several commonly used quadruple lens models, the magnification invariants, defined as the sum of the signed magnifications of images, have been analytically derived when the image multiplicity is a maximum.
arxiv   +1 more source

Tailoring the Anisotropic Oxygen Transport Properties in Bulk Ceramic Membranes Based on a Ruddlesden–Popper Oxide by Applying Magnetic Fields

Advanced Science, EarlyView.
Grain orientation in Nd2NiO4+δ ceramic membranes, achieved using magnetic fields, enables precise tuning of oxygen transport properties. This study presents an Nd2NiO4+δ bulk membrane with grains aligned with their a,b‐plane parallel to the oxygen permeation direction, produced by a neodymium magnet.
Giamper Escobar Cano, Motohide Matsuda, Zhijun Zhao, Frank Steinbach, Bernd Breidenstein, Hilke Petersen, Andreas Graff, Marc Widenmeyer, Anke Weidenkaff, Armin Feldhoff   +9 more
wiley   +1 more source

Stepless shape morphing polymer

SmartMat, Volume 4, Issue 1, February 2023., 2023
Reversible stepless discretionary morphing polymer is produced by simply training commercial ultrahigh molecular weight polyethylene (UHMWPE) via thermal treatment associated stretching. The key issue is that the crystals of UHMWPE memorize lots of temporary shapes as independent switching phases.
Lei Min, Min Zhu, Hanlun Lu, Yao Li, Longfei Fan, Mingqiu Zhang, Minzhi Rong   +6 more
wiley   +1 more source

Null gravitational redshift by a Reissner–Nordström black hole in the strong field limit

European Physical Journal C: Particles and Fields, 2020
The gravitational shift of electromagnetic frequency in the strong field limit is usually investigated under the common scenario, where the light receiver is far away from the central body while the emitter is in the strong-field region of the lens.
Guansheng He, Chaohong Pan, Xia Zhou, Weijun Li, Lin Li   +4 more
doaj   +1 more source