1,907 research outputs found
Charge asymmetry in high-energy photoproduction in the electric field of a heavy atom
The charge asymmetry in the differential cross section of high-energy
photoproduction in the electric field of a heavy atom is obtained.
This asymmetry arises due to the Coulomb corrections to the amplitude of the
process (next-to-leading term with respect to the atomic field). The deviation
of the nuclear electric field from the Coulomb field at small distances is
crucially important for the charge asymmetry. Though the Coulomb corrections to
the total cross section are negligibly small, the charge asymmetry is
measurable for selected final states of and . We further discuss
the feasibility for experimental observation of this effect.Comment: 6 pages, 3 figure
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Blue-light filtering spectacle lenses for visual performance, sleep, and macular health in adults
This is a protocol for a Cochrane Review (Intervention). The objectives are as follows:
To assess whether blue-light filtering spectacle lenses impart effects on visual function, provide protection to the macula, or both. We will also examine potential effects on the sleep-wake cycle
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Creative professional users musical relevance criteria
Although known item searching for music can be dealt with by searching metadata using existing text search techniques, human subjectivity and variability within the music itself make it very difficult to search for unknown items. This paper examines these problems within the context of text retrieval and music information retrieval. The focus is on ascertaining a relationship between music relevance criteria and those relating to relevance judgements in text retrieval. A data-rich collection of relevance judgements by creative professionals searching for unknown musical items to accompany moving images using real world queries is analysed. The participants in our observations are found to take a socio-cognitive approach and use a range of content and context based criteria. These criteria correlate strongly with those arising from previous text retrieval studies despite the many differences between music and text in their actual content
Nutrition and Eye Health
Diet is a key lifestyle factor that can have long-term effects on ocular health [...]
Natural history contributions of the University of Glasgow Exploration Society to Scotland and the World
Expeditions with a natural history focus have been
organised by University of Glasgow staff and
students since the 1930s. The educational benefits of
such expeditions to students have been reported by
Harper
et
al.
(
Journal
of
Biological
Education
51, 3-
16; 2017). Here, we present a short history of these
expeditions, concentrating on their scientific
achievements. In addition to expedition reports, a
large number of PhD theses, masters and honours
project reports and scientific papers have been
based on expedition work. Many biological
specimens have been deposited in museums,
including some new species. We provide case
histories of four expedition locations, to demonstrate
the variety of work done, and the value of returning
many times to the same place: Scotland, Trinidad and
Tobago, North Cyprus and Ecuador. A major problem
for expeditions is funding. For many years, the
Carnegie Trust for the Universities of Scotland ran a
funding stream that was crucial to the viability of
Scottish university expeditions, but this has sadly
now closed. For Glasgow University expeditions, the
Blodwen Lloyd Binns Bequest has provided a reliable
source since 1994, and we hope that it will continue
to do so
A taxonomic revision of Capnophyllum (Apiaceae: Apioideae)
AbstractThe Cape endemic genus Capnophyllum Gaertn. is revised. As a result of valuable recent collections and extensive fieldwork, this hitherto neglected genus was found to comprise four annual species, two of which are newly described, namely C. lutzeyeri Magee and B.-E.van Wyk, and C. macrocarpum Magee and B.-E.van Wyk. The four species are distinguished from one another by their fruit morphology (relative length of the styles, the shape and position of the stylopodium, fruit size, surface sculpturing, and the presence or absence of a sterile apical portion) and fruit anatomy (marginal wings slightly or prominently involute and secondary ribs present or absent). A comprehensive key to the species, their complete nomenclature and typification, together with complete descriptions and known geographical distributions for all the species are presented and illustrated
A Critical Appraisal of National and International Clinical Practice Guidelines Reporting Nutritional Recommendations for Age-Related Macular Degeneration: Are Recommendations Evidence-Based?
Eye care professionals should have access to high quality clinical practice guidelines that ideally are underpinned by evidence from robust systematic reviews of relevant research. The aim of this study was to identify clinical guidelines with recommendations pertaining to dietary modification and/or nutritional supplementation for age-related macular degeneration (AMD), and to evaluate the overall quality of the guidelines using the Appraisal of Guidelines for Research and Evaluation II (AGREE II) instrument. We also mapped recommendations to existing systematic review evidence. A comprehensive search was undertaken using bibliographic databases and other electronic resources for eligible guidelines. Quality appraisal was undertaken to generate scores for each of the six AGREE II domains, and mapping of extracted nutritional recommendations was performed for systematic reviews published up to March 2017. We identified 13 national and international guidelines, developed or updated between 2004 and 2019. These varied substantially in quality. The lowest scoring AGREE II domains were for 'Rigour of Development', 'Applicability' (which measures implementation strategies to improve uptake of recommendations), and 'Editorial Independence'. Only four guidelines used evidence from systematic reviews to support their nutritional recommendations. In conclusion, there is significant scope for improving current Clinical Practice Guidelines for AMD, and guideline developers should use evidence from existing high quality systematic reviews to inform clinical recommendations
CHI 2020: Right Here, Right Now?
Over the last twenty years the CHI conference has grown substantially. However, with the reframing of climate change as a climate crisis, environmental concerns have become increasingly pervasive in the community. In 2019 CHI introduced a sustainability role and set a goal to make CHI more sustainable. In 2020 CHI is in Hawaii. This work looks back over the last two decades and estimates what are substantial and growing CO2 emissions from conference travel. First, it posits how, in the short term, potential environmental damage can be minimised. Second, and longer-term, it invites the community to reflect on research dissemination and how the conference experience may need to change.This work was supported by EPSRC grant EP/R004471/
Technical Design Report for the PANDA Solenoid and Dipole Spectrometer Magnets
This document is the Technical Design Report covering the two large spectrometer magnets of the PANDA detector set-up. It
shows the conceptual design of the magnets and their anticipated performance. It precedes the tender and procurement of the magnets and, hence, is subject to possible
modifications arising during this process
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