Results 61 to 70 of about 151,031 (208)

Invisible Labor and the “Ghost Particle”: Underground Physics at the Kolar Gold Fields**

Berichte zur Wissenschaftsgeschichte, EarlyView.
Abstract When cosmic rays—high‐energy particles from outer space—encounter the Earth's atmosphere, they produce particles called neutrinos. To detect them, physicists go underground inside deep mines where the overlying rock can filter out the cosmic‐ray background radiation.
Nithyanand Rao
wiley   +1 more source

Estimation of reproduction numbers in real time: Conceptual and statistical challenges

Journal of the Royal Statistical Society: Series A (Statistics in Society), Volume 185, Issue S1, Page S112-S130, November 2022., 2022
Abstract The reproduction number R$$ R $$ has been a central metric of the COVID‐19 pandemic response, published weekly by the UK government and regularly reported in the media. Here, we provide a formal definition and discuss the advantages and most common misconceptions around this quantity.
Lorenzo Pellis, Paul J. Birrell, Joshua Blake, Christopher E. Overton, Francesca Scarabel, Helena B. Stage, Ellen Brooks‐Pollock, Leon Danon, Ian Hall, Thomas A. House, Matt J. Keeling, Jonathan M. Read, JUNIPER Consortium, Daniela De Angelis   +13 more
wiley   +1 more source

The Curious Concept That Almost Nobody Seemed to Care About at First: Virtual Particles in the Post‐War Period**

Berichte zur Wissenschaftsgeschichte, EarlyView.
Abstract Short‐lived, unobservable, and not subject to the usual rules of conservation of energy and momentum, virtual particles—an integral part of the conceptual framework of quantum field theory (QFT)—exhibit a number of curious characteristics which, in recent decades, have in part fueled important discussions about their ontological status ...
Jean‐Philippe Martinez
wiley   +1 more source

Metal halide perovskite for room temperature gamma‐ray spectrum detection

Information &Functional Materials, EarlyView.
Integrating recent advancements in metal halide perovskite (MHP) for room temperature gamma‐ray spectroscopy, we provide a comprehensive overview of the methods for growing high‐quality MHP crystals, along with fundamental insights into the structure of gamma‐ray devices and the defect characteristics of MHPs.
Zhongyi Lin, Lei Li, Yang Xu, Deren Yang, Zhenyi Ni   +4 more
wiley   +1 more source

At the far end of everything: A likely Ahrensburgian presence in the far north of the Isle of Skye, Scotland

Journal of Quaternary Science, EarlyView.
ABSTRACT A Late Upper Paleolithic (LUP) site containing Ahrensburgian‐type stone tools has been discovered at South Cuidrach, Isle of Skye, Scotland. Together with a group of intertidal stone circular alignments also recently discovered on the island, this new evidence for the occupation of northern Scotland also represents the most northerly LUP site ...
Karen Hardy, Natasha L.M. Barlow, Edward Taylor, Sarah L. Bradley, John McCarthy, Graham Rush   +5 more
wiley   +1 more source

High‐throughput calculation of large spin Hall conductivity in heavy‐metal‐based antiperovskite compounds

Materials Genome Engineering Advances, EarlyView.
The present work establishes high‐throughput database (more than 4500 structures) of SHC in antiperovskites and screens 295 structurally stable compounds and identifies 24 compounds with intrinsic SHC exceeding 500 (ℏ/e) (Ω⁻1 cm⁻1), which is crucial for designing future electric and spintronic devices.
Xiong Xu, J. X. Lv, Y. Wang, Min Li, Zhe Wang, Hui Wang   +5 more
wiley   +1 more source

X-ray Fluctuations from the Slim Disk [PDF]

arXiv, 2000
The responses of perturbations added into the optically thick, advection-dominated accretion disk (ADAD), what we call the slim disk (SD), are investigated through numerical simulations. Although it is proposed that the SD is thermally stable, I find that a perturbation added into the disk is not rapidly damped and moves through the disk in its free ...
arxiv  

Major and Trace Element Composition Differences Revealed in Porcine Intestine by Dynamic Analysis and MeV Ion Microscopy

physica status solidi (a), EarlyView.
Herein, C, N, and Ca concentration images in dry porcine intestine are used to determine trace element concentrations ex vivo. Physiologically relevant concentrations in biological tissue, in the in vivo, state are of the order of μmol L−1 and mmol L−1.
Harry J. Whitlow, Gyula Nagy, Andrej Kuznetsov, Robert J.W. Frost, Alexander Azarov, Karen M. Smith, Sumittra Amphalop, Wimonrut Insuan, Sakulchit Wichianchot, Min‐Quin Ren, Thomas Osipowicz, Chris G. Ryan, Wanwisa Sudprasert, Francois Villinger   +13 more
wiley   +1 more source

Optimizing Phononic Crystal Waveguides for Enhanced Surface Acoustic Wave Confinement

physica status solidi (b), EarlyView.
A phononic crystal consisting of periodic arrays of nanofabricated holes on a surface can form a metamaterial‐like layer with properties different from the host material. Exploiting these surface properties, an optimized waveguide geometry is designed for surface acoustic waves using twofold elliptical cylinder inclusions to create a slow region that ...
Karanpreet Singh, Gabe Willson, James Adam Howard Stotz   +2 more
wiley   +1 more source

Structure and Migration Mechanisms of Oxygen Interstitial Defects in β‐Ga2O3

physica status solidi (b), EarlyView.
The structures and diffusion mechanisms of interstitial oxygen in different charge states in β‐Ga2O3 are extensively studied using density functional theory. The results provide a detailed map of the potential energy surface for oxygen interstitials in β‐Ga2O3 and demonstrate how these ions migrate between different rings in the structure.
Chaiyawat Kaewmeechai, Jack Strand, Alexander L. Shluger   +2 more
wiley   +1 more source