1,720,994 research outputs found
Carroll, M R, 212555
No full textThis record was harvested from a previous catalogue system and will be withdrawn in 2025. Information in this record may be superseded or incomplete.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/376122Surname: CARROLL
Given Name(s) or Initials: M R
Military Service Number or Last Known Location: 212555
Missing, Wounded and Prisoner of War Enquiry Card Index Number: SEA-3245188685
Item: [2016.0049.08430] "Carroll, M R, 212555
Volatile element zonation in Campanian Ignimbrite magmas (Phlegrean Fields, Italy): evidence from the study of glass inclusions and matrix glasses
No full textThe distribution of H2O, F, Cl and S in the Campanian Ignimbrite (CI) magma chamber was investigated through study of primary glass inclusions and matrix glasses from pumices of the Plinian fall deposit. The eruption, fed by trachytic to phono-trachytic magmas, mainly produced a trachytic non-welded to partially welded tuff, underlain by a minor cogenetic fallout deposit. The entire chemical variability of the eruptive products is well represented in the pumices of the Plinian fall deposit, which we divide into a basal Lower Fall Unit (LFU) and an overlying Upper Fall Unit (UFU). Primary glass inclusions were only found in clinopyroxenes associated with the LFU pumice and contain a mean of 1.60 +/- 0.32 wt% H2O (analysed by FTIR), 0.11 +/- 0.08 wt% F, 0.37 +/- 0.03 wt% Cl and 0.08 +/- 0.04 wt% SO3 (EMP analysis); CO2 concentrations were below the FTIR detection limit (10-20 ppm). The coexisting matrix glasses contain similar amounts of halogens and sulfur but less water (similar to0.60 wt%). Partially degassed matrix glasses from UFU pumices contain a mean of 0.30 +/- 0.02 H2O, 0.28 +/- 0.10 F, 0.04 +/- 0.02 SO3 and 0.80 +/- 0.04 wt% Cl. To reconstruct the total amount of volatiles dissolved in the most evolved trachytes we have used experimental solubility data and mass:balance calculations concerning the amount of crystal fractionation required to produce the most evolved trachyte from the least evolved trachyte; these yield an estimated pre-eruptive magma volatile content (H2O + Cl + F) of similar to5.5 wt% for the most evolved magmas. On the basis of new determinations of Cl solubility limits in hydrous trachytic melts coexisting with an aqueous fluid phase + hydrosaline melt (brine), we suggest that the upper part of the magma chamber which fed the CI eruption was fluid(s) saturated and at a minimum depth of similar to2 km. Variations in eruptive style (Plinian fallout, pyroclastic flows) do not appear to be related to significant variations in pre-eruptive volatile contents
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
Chlorine solubility in evolved alkaline magmas
No full textExperimental studies of Cl solubility in trachytic to phonolitic melts provide insights into the capacity of alkaline
magmas to transport Cl from depth to the earths surface and atmosphere, and information on Cl solubility
variations with pressure, temperature and melt or fluid composition is crucial for understanding the reasons for
variations in Cl emissions at active volcanoes. This paper provides a brief review of Cl solubility experiments
conducted on a range of trachytic to phonolitic melt compositions. Depending on the experimental conditions
the melts studied were in equilibrium with either a Cl-bearing aqueous fluid or a subcritical assemblage of low-
Cl aqueous fluid + Cl-rich brine. The nature of the fluid phase(s) was identified by examination of fluid inclusions
present in run product glasses and the fluid bulk composition was calculated by mass balance. Chlorine
concentrations in the glass increase with increasing Cl molality in the fluid phase until a plateau in Cl concentration
is reached when melt coexists with aqueous fluid + brine. With fluids of similar Cl molality, higher Cl
concentrations are observed in peralkaline phonolitic melts compared with peraluminous phonolitic melts; overall
the Cl concentrations observed in phonolitic and trachytic melts are approximately twice those found in calcalkaline
rhyolitic melts under similar conditions. The observed negative pressure dependence of Cl solubility implies
that Cl contents of melts may actually increase during magma decompression if the magma coexists with
aqueous fluid and Cl-rich brine (assuming melt-vapor equilibrium is maintained). The high Cl contents (approaching
1 wt% Cl) observed in some melts/glasses from the Vesuvius and Campi Flegrei areas suggest saturation
with a Cl-rich brine prior to eruption.PublishedJCR Journalope
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
Petrologic Experimental Data on Vesuvius and Campi Flegrei Magmatism: A Review
No full textExperimental studies can provide valuable information about volcanic systems, and they can provide quantitative information concerning magma storage conditions, volatile contents, and timescales of magma migration within the earth. The principle types of information that can be provided by experimental studies include phase equilibria (what P-T conditions needed for observed minerals), melt differentiation trends due to crystal- lization, and volatile solubilities (mainly P constraints, based on observed volatile contents of melt inclusions [MIs]). In this chap- ter, we address all of these issues, with particular attention to the relatively alkali-rich magmas typically involved in volcanic activity of the VesuviuseCampi Flegrei (CF) area. We note that experimental studies can also provide valuable information on crystallization kinetics (e.g., Shea et al., 2009; Di Carlo et al., 2010; Arzilli and Carroll, 2013; Arzilli et al., 2016; Romano et al., 2018), mineral reaction rates (e.g., Mollo et al., 2011), timescales of magma ascent and/or magma mixing (e.g., Morgan et al., 2004; Perugini et al., 2010; Iovine et al., 2017), and trace element partitioning behavior (e.g., Pappalardo et al., 2008: Fedele et al., 2009; Mollo et al., 2016), but these arguments are beyond the scope of this chapter, and the interested reader can find further information in the cited references. In the first section of this chapter, we discuss phase equilibrium experiments and the insights they may provide for magmatism in the VesuviuseCF region. Following this, we present the current state of understand- ing concerning volatile solubilities in the typically alkaline melt compositions that characterize magmatic activity in the VesuviuseCF area and compare the available data with the more abundant data available for less alkaline magma composi- tions. These data provide insights concerning volatile element behavior in these volcanic systems and aid interpretation of other studies using MIs for better understanding preeruptive magmatic volatile contents, depths of magma origins, and magma degassing processes during ascent
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
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