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Adams, S, 426290
No full textThis record was harvested from a previous catalogue system and will be withdrawn in 2025. Information in this record may be superseded or incomplete.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/367811Surname: ADAMS
Given Name(s) or Initials: S
Military Service Number or Last Known Location: 426290
Missing, Wounded and Prisoner of War Enquiry Card Index Number: 54855177858
Item: [2016.0049.00143] "Adams, S, 426290
Relationship between bond valence and bond softness of alkali halides and chalcogenides
No full textEstablished bond-valence parameter tables rely on the assumption that the bond-valence sum of a central atom is fully determined by interactions to atoms in its first coordination shell. In this work the influence of higher coordination shells is tested in detail for bonds between lithium and oxygen. It is demonstrated that the sum of the weak interactions with atoms of the second coordination shells significantly contributes to the valence sum and should therefore not be neglected. Since the independent refinement of the two parameters R(0) and b is hardly possible from the limited range of bond lengths occurring in the first coordination shell, the restriction of bond-valence sums to contributions from nearest neighbours implicated another far-reaching simplification: the postulation of a universally fixed value of the bond-valence parameter b which characterizes the shape of the bond-valence pseudopotential for the respective atom pair. However, recent more sophisticated applications of the bond-valence concept, e.g. to model ion-transport pathways in solid electrolytes, demand sensible estimates of the bond-valence sums for mobile ions not only at their equilibrium sites but also at interstitial sites and bottle-necks of transport pathways. Calculations of bond valences at these non-equilibrium sites require the knowledge of the actual shape of the bond-valence pseudopotential. A systematic route to a more realistic estimate of b for alkali halides and chalcogenides is developed in this work from an empirical correlation between b and the absolute softnesses of the interacting particles
CDW superstructures in hydrogen molybdenum bronzes HxMoO3
No full textHydrogen molybdenum bronzes HxMoO3 (0 < x < 2) are consistently described as low-dimensional mixed conductors, whose properties under ambient conditions are controlled by charge density wave modulations. Proton conduction pathways in the bronzes are modeled by a bond valence approach. The redistribution of hydrogen during the intercalation process between two types of potential proton sites is simulated in a molecular mechanics study. Therefrom a structure model for the bronze phase TI (0.85 < x < 1.04) is derived, which permits a Rietveld refinement of its previously unknown structure from powder X-ray data (space group I12/m1; a = 14.5191(6) Angstrom, b = 3.7944(1) Angstrom, 7.7248(3) Angstrom, beta = 93.743(2)degrees for x approximate to 0,9), Both the doubling of the host cell along the c-axis in phase II and the 6 x c superstructure found for phase I with x approximate to 1/3 meet the expectations for quasi-one-dimensional Peierls distorted systems, Modifications in the structure, proton ordering, and properties of the bronzes are studied as a function of temperature. A time-resolved powder XRD investigation on the oxidation of phase II indicates the existence of a intermediate phase H0.6MoO3. The powder structure determination of this metastable phase (space group C2/m, a = 14.543(2) Angstrom, b = 3.8520(4) Angstrom, c = 3.7691(4) Angstrom, beta = 90.73(1)degrees) indicates a redistribution of the protons during this oxidation step. (C) 2000 Academic Press
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
Modelling ion conduction pathways by bond valence pseudopotential maps
No full textBond valence models of ion conduction pathways are utilized to elucidate the conduction mechanism in crystalline and amorphous silver ion conductors. For ion conductors with a moderate degree of disorder the crystallographically determined average structure sufficiently approximates the required local structure model. The bond valence mismatch required to construct an infinite bond valence pathway is related to the activation energies for a long-range silver ion conduction. For structurally disordered and amorphous ion conductors local structure models are derived from the crystallographic data by force-field techniques (e.g. by molecular dynamics simulations) and by the Reverse Monte Carlo method. The influence of the local coordinations on the mobility of the silver ions is investigated by a statistical evaluation of the resulting bond valence pathway clusters. (C) 2000 Elsevier Science B.V. All rights reserved
Adams, S G, [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/367818Surname: ADAMS
Given Name(s) or Initials: S G
Military Service Number or Last Known Location: No Service Number
Missing, Wounded and Prisoner of War Enquiry Card Index Number: 48642177865
Item: [2016.0049.00150] "Adams, S G, [No Service Number]
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
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