1,721,045 research outputs found
Lithostructural characters of the acoustic basement of the Sardinia Channel (Southwestern Tyrrhenian Sea)
No full textUltra-high pressure garnet orthopyroxenite (Dabie Shan, China) as filters for Si-rich hydrous melts/supercritical liquids in deep subduction environments
No full textThe ultrahigh-pressure (UHP) Maowu Ultramafic Complex (Dabie Shan, China) is
hosted by coesite-bearing gneisses. Garnet–orthopyroxenites within the ultramafic
complex derive from garnet–harzburgite precursors that have been metasomatised at
peak conditions (4.0
±1.0 GPa, 750±50 ̊C) by the addition of a silica- and incompat-
ible trace element-rich fluid phase (hydrous melt), sourced from the associated crustal
rocks. This metasomatism produced poikilitic orthopyroxene with high LREE and Ni
contents and inclusion-rich garnet porphyroblasts. Solid polyphase primary inclusions
within peak metamorphic garnet display negative crystal shapes and constant volume
ratios of infilling mineral phases. Experimental homogenisation of these inclusions at
conditions close to the estimated metamorphic peak demonstrates that the polyphase
inclusions derive from trapped solute-rich aqueous fluids. The trace element character-
istics of the experimentally re-homogenised inclusions include high LREE contents, a
pronounced enrichment in LILE, with spikes of Cs, Ba, Pb and high U/Th.
The investigated ultra high pressure Maowu garnet–orthopyroxenites represent a nat-
ural laboratory to constrain the trace element transfer from the subducted crust to the
mantle wedge at sub-arc depths. The observed textures and chemical characteristics
provide evidence for the infiltration of a felsic hydrous melt into garnet–peridotite, a
circumstance comparable to expected interaction of sediment-derived melts with mantle wedge peridotites in subduction zones. The SiO2 and Al2O3 component of the hy-
drous melt reacted with olivine to form orthopyroxene and new garnet. The neoblastic
orthopyroxene accommodates some of the LREE, whereas the H2O and LILE com-
ponent of the melt were partitioned into a residual aqueous fluid phase. Remnants of
such an aqueous fluid were trapped in the garnet and formed the polyphase inclusions.
The trace element pattern of these inclusions is very similar to the incompatible ele-
ment enrichment observed in arc lavas.We suggest that the residual fluid produced by
the peridotite/hydrous melt reaction is able to transfer the characteristic LILE signa-
ture fromthe subducted sediments to the locus of partial melting in the mantle wedge.
Moreover, this study provides evidence that polyphase inclusions are important tools
for constraining the nature and composition of UHP fluids
Good patient satisfaction with low complications rate after trochleoplasty in patellofemoral instability
No full textPurpose: Trochlear dysplasia has been recognized as the most common factor in patients with patellofemoral dislocation. Trochleoplasty is a surgical procedure whose primary goal is to modify the femoral trochlea's abnormal shape in patients suffering from patellar instability, requiring good surgical skills, correct indication, and accurate patient information.
Methods: The review aims to describe preoperative planning, patient selection, most common surgical techniques, and clinical results of trochleoplasty in patellar instability in a reproducible manner.
Results: Trochleoplasty can be considered a general term to describe a group of different procedures that reduce trochlear dysplasia's impact on patellar instability, aiming to restore patella-trochlear congruency, remove the supratrochlear bump, allowed a new groove positioning and are generally associated with other procedures. Recent studies showed satisfactory long-term results with the restoration of patellar stability, improving radiological findings of patellofemoral instability.
Conclusion: Trochleoplasty is a technically demanding technique, requiring careful patient selection, detailed knowledge, and surgical skills to avoid severe complications. Good patient satisfaction with a low risk of significant complications such as patellofemoral arthritis has been revealed. In conclusion, trochleoplasty should be systematically included in the treatment of patellar dislocation, if indicated
Il trattamento chirurgico dell’instabilità di caviglia nello sportivo : come, quando e perché
No full textAnkle sprains can result in chronic instability causing severe working or
athletic inabilities. Anatomic or not anatomic techniques are possible to
achieve articular stability. Arthroscopy is a less invasive technique with good clinical results and is nowadays used by many surgeons. The aim of this work is to describe lesions, non-surgical treatments and possible surgical
technique
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
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