Results 81 to 90 of about 1,664,690 (327)
Gravitational-wave asteroseismology with fundamental modes from compact binary inspirals
Nature Communications, 2020 Independently measuring the tidal deformability and the fundamental oscillation mode (fmode) frequency enables tests of gravity and the nature of compact binaries.
Geraint Pratten +2 more
doaj +1 more source
Dual Optical Hyperbolicity of PdCoO2 and PdCrO2 Delafossite Single Crystals
Advanced Functional Materials, EarlyView.In this work, the hyperbolic response of PdCoO₂ and PdCrO₂ delafossites is investigated for the first time. They exhibit dual hyperbolic regimes, one localized around a phonon absorption in the mid‐infrared spectral region, and the other extending into the visible range.
Salvatore Macis +14 more
wiley +1 more source
What do we know about cosmography
European Physical Journal C: Particles and Fields, 2017 In the present paper, we investigate the cosmographic problem using the bias–variance trade-off. We find that both the z-redshift and the $$y=z/(1+z)$$ y = z / ( 1 + z ) -redshift can present a small bias estimation.
Ming-Jian Zhang, Hong Li, Jun-Qing Xia
doaj +1 more source
Astronomy with ultra high-energy particles
arXiv: Astrophysics, 2008 Recent measurements of the properties of cosmic rays above 10^17 eV are summarized and implications on our contemporary understanding of their origin are discussed. Cosmic rays with energies exceeding 10^20 eV have been measured, they are the highest-energy particles in the Universe.
openaire +4 more sources
Defects Dynamic in Photo‐Excited CeO2 and their Influence on CO2 Photoreduction
Advanced Functional Materials, EarlyView.X‐ray photoelectron spectroscopy study under light excitation is presented to track the defect dynamic (Ce4+ to Ce3+) in CeO2. Surface enhanced Raman spectroscopy confirmed the key role of Ce3+ states in controlling charge and energy transfer across the CeO2‐dye molecule interface.
Rambabu Yalavarthi +3 more
wiley +1 more source
Advanced Healthcare Materials, EarlyView.Imaging pH in a live rabbit at the surface of a sensor‐coated titanium plate using X‐ray excited luminescent chemical imaging (XELCI). A raster scanning X‐ray beam generates radioluminescence from a spot on the sensor, and the luminescence passes through the tissue and is collected at two wavelengths to determine local pH.
Unaiza Uzair +6 more
wiley +1 more source
High Energy Cosmic Ray and Neutrino Astronomy [PDF]
, 2011 Cosmic-rays with energies exceeding 10^{19} eV are referred to as Ultra High Energy Cosmic Rays (UHECRs). The sources of these particles and their acceleration mechanism are unknown, and for many years have been the issue of much debate. The first part of this review describes the main constraints, that are implied by UHECR observations on the ...
openaire +3 more sources
Manipulating Ferroelectric Topological Polar Structures with Twisted Light
Advanced Materials, EarlyView.We demonstrate dynamic control of ferroelectric order in quasi‐2D CsBiNb2O7 using twisted ultraviolet light carrying orbital angular momentum. Our approach harnesses non‐resonant multiphoton absorption and induced strain to modulate topological of ferroelectric polarization textures.
Nimish P. Nazirkar +10 more
wiley +1 more source
Heterogeneous Nanopore Arrays – Selective Modification of Nanopores Embedded in a Membrane
Advanced Materials, EarlyView.Biological processes rely on the concerted action of channels with different functionalities embedded in the same membrane. Inspired by nature, heterogeneous nanopore arrays are prepared where two nanopores are connected in parallel and function as two different elements of an ionic circuit: a diode and a resistor.
Ethan Cao, Zuzanna S. Siwy
wiley +1 more source
Nucleosynthesis constraints on the faint vector portal
EPJ Web of Conferences, 2015 New Abelian U(1)′ gauge bosons Vμ can couple to the Standard Model through mixing of the associated field strength tensor Vμν with the one from hypercharge, FμνY.
Fradette Anthony +3 more
doaj +1 more source