Institution
Durham University
Education•Durham, United Kingdom•
About: Durham University is a education organization based out in Durham, United Kingdom. It is known for research contribution in the topics: Population & Galaxy. The organization has 39385 authors who have published 82311 publications receiving 3110994 citations. The organization is also known as: University of Durham & Gallery of Durham University.
Topics: Population, Galaxy, Redshift, Context (language use), Star formation
Papers published on a yearly basis
Papers
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TL;DR: In this article, the authors determined the fraction of barred galaxies in the H-band for a statistically well-defined sample of 186 spirals drawn from the Ohio State University Bright Spiral Galaxy survey.
Abstract: We have determined the fraction of barred galaxies in the H-band for a statistically well-defined sample of 186 spirals drawn from the Ohio State University Bright Spiral Galaxy survey. We find 56% of our sample to be strongly barred at H, while another 16% is weakly barred. Only 27% of our sample is unbarred in the near-infrared. The RC3 and the Carnegie Atlas of Galaxies both classify only about 30% of our sample as strongly barred. Thus strong bars are nearly twice as prevalent in the near-infrared as in the optical. The frequency of genuine optically hidden bars is significant, but lower than many claims in the literature: 40% of the galaxies in our sample that are classified as unbarred in the RC3 show evidence for a bar in the H-band, while for the Carnegie Atlas this fraction is 66%. Our data reveal no significant trend in bar fraction as a function of morphology in either the optical or H-band. Optical surveys of high redshift galaxies may be strongly biased against finding bars, as bars are increasingly difficult to detect at bluer rest wavelengths.
428 citations
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University of Wisconsin-Madison1, Washington University in St. Louis2, Columbia University3, Boston University4, Johns Hopkins University School of Medicine5, Durham University6, Imperial College London7, University of Chicago8, National Institutes of Health9, University of Washington10, Benaroya Research Institute11
TL;DR: Underlying respiratory allergy and experimental allergen exposure reduce the expression of the SARS-CoV-2 receptor, ACE2, which could lead to reduced COVID-19 susceptibility.
Abstract: Underlying respiratory allergy and experimental allergen exposure reduce the expression of the SARS-CoV-2 receptor, ACE2, which could lead to reduced COVID-19 susceptibility.
427 citations
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TL;DR: In this paper, a wide variety of SiC devices are compared to that of similar Si and GaAs devices and to theoretically expected results, and the performance of these devices is compared to the expected results.
Abstract: In recent years, silicon carbide has received increased attention because of its potential for high-power devices. The unique material properties of SiC, high electric breakdown field, high saturated electron drift velocity, and high thermal conductivity are what give this material its tremendous potential in the power device arena. 4H-SiC Schottky barrier diodes (1400 V) with forward current densities over 700 A/cm/sup 2/ at 2 V have been demonstrated. Packaged SITs have produced 57 W of output power at 500 MHz, SiC UMOSFETs (1200 V) are projected to have 15 times the current density of Si IGBTs (1200 V). Submicron gate length 4H-SiC MESFETs have achieved f/sub max/=32 GHz, f/sub T/=14.0 GHz, and power density=2.8 W/mm @ 1.8 GHz. The performances of a wide variety of SiC devices are compared to that of similar Si and GaAs devices and to theoretically expected results.
427 citations
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TL;DR: A theory for the selfconsistent configuration of upstream hydromagnetic waves, upstream energetic storm particle (ESP) events, and downstream post-shock ion enhancements at interplanetary traveling shocks is presented in this article.
Abstract: A theory for the self-consistent configuration of upstream hydromagnetic waves, upstream energetic storm particle (ESP) events, and downstream postshock ion enhancements at interplanetary traveling shocks is presented. The observations of upstream ultralow frequency waves and those ESP events and postshock enhancements which exhibit approximately isotropic ion distributions in the solar wind or shock frame are briefly reviewed. The theory of Lee (1982) for application to interplanetary traveling shocks is modified and analytical solutions for the wave spectrum as a function of wavenumber and z are presented along with the ion omnidirectional distribution functions as functions of energy and z for all ion species. The theory quantitatively explaines the observed features of the shock-associted energetic ions and predicts the configuration of upstream hydromagnetic waves.
427 citations
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TL;DR: In this article, the perturbative framework for the calculation of hard-scattering processes is developed and a reasonably rigorous development of the formalism of hardscattering of quarks and gluons as well as an intuitive understanding of the physics behind the scattering is provided.
Abstract: In this paper, we will develop the perturbative framework for the calculation of hard-scattering processes. We will undertake to provide both a reasonably rigorous development of the formalism of hard-scattering of quarks and gluons as well as an intuitive understanding of the physics behind the scattering. We will emphasize the role of logarithmic corrections as well as power counting in αS in order to understand the behaviour of hard-scattering processes. We will include ‘rules of thumb’ as well as ‘official recommendations’, and where possible will seek to dispel some myths. We will also discuss the impact of soft processes on the measurements of hard-scattering processes. Experiences that have been gained at the Fermilab Tevatron will be recounted and, where appropriate, extrapolated to the LHC. (Some figures in this article are in colour only in the electronic version)
427 citations
Authors
Showing all 39730 results
Name | H-index | Papers | Citations |
---|---|---|---|
Eugene Braunwald | 230 | 1711 | 264576 |
Robert J. Lefkowitz | 214 | 860 | 147995 |
David J. Hunter | 213 | 1836 | 207050 |
Francis S. Collins | 196 | 743 | 250787 |
Robert M. Califf | 196 | 1561 | 167961 |
Martin White | 196 | 2038 | 232387 |
Eric J. Topol | 193 | 1373 | 151025 |
David J. Schlegel | 193 | 600 | 193972 |
Simon D. M. White | 189 | 795 | 231645 |
George Efstathiou | 187 | 637 | 156228 |
Terrie E. Moffitt | 182 | 594 | 150609 |
John A. Rogers | 177 | 1341 | 127390 |
Avshalom Caspi | 170 | 524 | 113583 |
Richard S. Ellis | 169 | 882 | 136011 |
Rob Ivison | 166 | 1161 | 102314 |