1,721,077 research outputs found
Mitchell, Alexander Mcgregor, [No Service Number]
No full textThis record was harvested from a previous catalogue system and will be withdrawn in 2025. Information in this record may be superseded or incomplete. Visit this record in UMA's new catalogue at: https://archives.library.unimelb.edu.au/nodes/view/405463Surname: MITCHELL. Given Name(s) or Initials: ALEXANDER MCGREGOR. Military Service Number or Last Known Location: [No Registration Number]. Missing, Wounded and Prisoner of War Enquiry Card Index Number: 57967.243416
Item: [2016.0049.37740] "Mitchell, Alexander Mcgregor, [No Service Number]
The renormalization group and quantum gravity
No full textA universally accepted theory of quantum gravity would play a crucial role in a complete understanding of Nature which has so far eluded physicists. This is illustrated by the variety and complexity of the many attempts to produce such a theory. A collection of analyses is presented which investigates a novel, natural approach which combines general relativity with quantum field theory in the framework of the Wilsonian renormalization group whilst respecting the conformal instability. We investigate the structure of this theory at first order in the coupling and verify that a continuum limit exists. We find that a continuum limit exists only if the theory is defined outside of the diffeomorphism invariant subspace. In the UV, interactions are associated to a coefficient function which is parametrised by an infinite number of fundamental couplings. In the physical limit diffeomorphism invariance is reinstated such that for a suitable choice of these couplings the coefficient functions trivialise. Dynamically generated effective diffeomorphism invariant couplings emerge, in particular Newton’s coupling. This investigation is continued to second order in perturbation theory. For pure quantum gravity, with vanishing cosmological constant, the result of the standard quantisation is recovered. Quantum gravity is renormalizable at second order for kinematic reasons but the structure is shown to hold in general. It may be the case that a continuum limit exists however with a, phenomenologically inconvenient, infinite number of fundamental couplings. However a possible non-perturbative resolution, based on the conformal instability and the parabolic properties of the flow equations, is investigated which would fix higher order effective couplings in terms of Newton’s constant and the cosmological constant. We then explore the properties of these flows with opposite natural direction through a related asymptotic safety problem, studying whether or not they have complete solutions. Finally we conclude with a discussion of the ramifications of this structure and possible applications to outstanding physical problems, in particular we investigate how well this structure is extended to arbitrary space-time dimensions and the physical consequences thereof
Mitchell, David W., Alexander W. and James W. - Account of the Guardianship of William D. Baker guardian of David W Mitchell Alexander W. Mitchell and James W Mitchell
Full text linkAccount of the Guardianship of William D. Baker guardian of David W Mitchell Alexander W. Mitchell and James W Mitchell.https://scholarsjunction.msstate.edu/lantern-hnf/1287/thumbnail.jp
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Reducing suspicion of sexual abuse in paediatric chlamydial conjunctivitis using ompA genotyping.
No full textChlamydia trachomatis is a Gram-negative bacterium that causes urogenital tract infections, and ocular infections including trachoma, neonatal conjunctivitis and adult chlamydial inclusion conjunctivitis. A positive C. trachomatis diagnosis in children often raises suspicions of sexual abuse. While outer membrane protein A (ompA) genotypes A–C are non-invasive and are associated with trachoma; ompA genotypes D–K are often associated with sexually transmitted urogenital infections or sexually acquired chlamydial conjunctivitis. A 10-year-old female presented with a 7-month history of unilateral conjunctivitis with itching, watering and hyperaemia. She had recently moved from an urban centre in Afghanistan to the UK. A conjunctival swab taken from the child tested positive for C. trachomatis. Application of ompA genotyping to conjunctival swab chlamydial DNA demonstrated that the C. trachomatis had an ompA genotype C. Chlamydial strains with this ompA genotype cause trachoma and have never previously been associated with urogenital infection. This result supported cessation of child protection investigations
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