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Edwards, Lloyd G, 6872
No full textThis record was harvested from a previous catalogue system and will be withdrawn in 2025. Information in this record may be superseded or incomplete.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/383469Surname: EDWarDS. Given Name(s) or Initials: LLOYD G. Military Service Number or Last Known Location: 6872. Missing, Wounded and Prisoner of War Enquiry Card Index Number: 15024.223116
Item: [2016.0049.15762] "Edwards, Lloyd G, 6872
Lattice dynamics of alpha-CO from an ab initio potential
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6872.pdf (Publisher’s version ) (Open Access
[Cambria & Indiana, Engine Drawing Card, Sketch No. 6872]
No full textThis engine drawing card was created for the Cambria and Indiana Railroad, Class 14-54 1/4 F. Section J-14 1/4F. Sketch 6872. Copy Spec. C-6132
Evaluation of reproducibility of the chemical solubility of dental ceramics using ISO 6872:2015
Get PDFStatement of problem
The current chemical solubility method in the International Standards Organization (ISO) 6872 (2015) specifies only the total surface area of specimens for testing (≥30 cm2) but does not describe the morphology or geometry. This could impact the reproducibility of the test outcomes.
Purpose
The purpose of this in vitro study was to investigate the factors influencing the reliability of the ISO 6872:2015 “Dentistry-Ceramic materials” test for chemical solubility.
Material and methods
Chemical solubility analysis of a range of materials and specimen geometries was performed in accordance with ISO 6872:2015. Yttria-stabilized tetragonal zirconia polycrystal (Y-TZP), VITABLOCS Mark II, IPS e.max Press, and IPS e.max ZirPress materials were formed into a range of cubic and spherical geometries to comply with the 30-cm2 minimum surface area requirement. The surface microstructure of the specimens was analyzed using a scanning electron microscope, inductively coupled plasma optical emission spectrometry (ICP-OES) was used to analyze the solutes, and surface hardness of the specimens was measured by using a Vickers hardness tester before and after testing. An optimized solubility test was devised, which eliminated specimen handling once the specimens had been ground and polished. This modified test was performed on VITABLOCS Mark II and Y-TZP.
Results
The results of the original chemical solubility method of ISO 6872:2015 showed significantly variable findings for each tested material, with a predictable relationship between geometry and chemical solubility. The hardness values decreased significantly after the solubility testing. The optimized method showed significantly improved reproducibility of the chemical solubility measurement compared with the original ISO 6872:2015 test.
Conclusions
The results of the current chemical solubility standard method can be manipulated while still complying with the ISO 6872:2015 standard
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Get PDF“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
Get PDFWe 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
Investigating the Validity of the ISO 6872:2015 ‘Dentistry - Ceramic Materials’ for Chemical Solubility
Get PDFMost research regarding dental ceramics focuses on the mechanical, physical and optical properties. These properties are important; however, the chemical durability of dental ceramics is also significant. The oral cavity is a complex environment, ‘in vitro’ studies have not succeeded in replicating the solubility measurements of dental ceramics perfectly. The International Organization for Standardisation has published revised chemical solubility testing methods for dental ceramics ISO 6872. These methods failed to improve the reproducibility of the chemical solubility findings (Stokes et al., 2002), which led many researchers to develop alternative methods.
Nevertheless, these ISO methods have received limited criticism in the literature. Therefore, the aim of this research was to investigate the validity of the ISO 6872 (BS ISO, 2015) ‘Dentistry: Ceramic materials’ for chemical solubility, and if required design a superior method. The current standard ISO 6872 (BS ISO, 2015) specifies the total surface area of the test specimens only. Therefore, the research hypothesis is that any alteration of the specimens’ geometry will affect the chemical solubility value of the same material.
II
The initial findings showed that chemical solubility can be manipulated by altering the geometry of individual test specimens whilst still complying with the current standard. Characterisation tests such as SEM, EDS, XRD, ICP and Vickers hardness were performed to investigate the effects of the test environment on the specimens. As a result, the physical handling of the specimens was assumed to affect the outcomes of the chemical solubility test. An optimised test was designed to minimise the contact of the specimens and the findings showed that there is no significant difference between different specimens’ geometries.
The study concluded that the current prescribed chemical solubility method of ISO 6872 (BS ISO, 2015) lacks some specifications in order to be reliable in measuring the chemical solubility values of dental ceramics
Stars and gas in the very large interacting galaxy NGC 6872
No full textThe dynamical evolution of the
large (>100 kpc), barred spiral galaxy NGC 6872
and its small companion IC 4970 in the southern group Pavo
is investigated.
We present
N-body simulations with stars and gas and
21 cm Hi
- …
