1,720,963 research outputs found
Polyphase deformation history of the "Tibetan Sedimentary Sequence" in the Himalayan Chain (South East Tibet)
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From collision to hypercollision in the Tibetan Sedimentary Sequence: Insights from deformation, metamorphism and geochronology in SE Tibet (Cina)
No full textVengono presentati i risultati di uno studio mutidisciplinare svolto in
un’area chiave del Tibet sud orientale, compreso tra la sutura dell’Indo-
Tsangpo e il cristallino dell’alto Himalya. Dati meso e microstrutturali
sono stati raccolti lungo diversi transetti perpendicolari al trend
principale della catena per comprendere l’evoluzione tettonica della
Successione Sedimentaria Tibetana durante le diverse fasi della collisione
continentale che ha dato origine alla catena himalayana. E’
stata riconosciuta una tettonica polifasata caratterizzata da due fasi
deformative principali entrambe associate allo sviluppo di pieghe con
foliazione di piano assiale. E’ stato rilevato un importante gradiente
di deformazione spostandosi da S verso N. L’analisi strutturale è stata
affiancata dallo studio del grado metamorfico dell’unità tettonica
attraverso lo studio della cristallinità dell’illite e la riflettanza della
vitrinite che indicano condizioni metamorfiche variabili dalla diagenesi
all’epizona. Inoltre su campioni selezionati sono state effettuate
analisi geocronologiche (K/Ar) che indicano per la seconda fase deformativa
un’età di circa 24 M.A
Kinematic evolution of the eastern Tethyan Himalaya: Constraints from magnetic fabric and structural properties of the Triassic flysch in SE Tibet
No full textAnisotropy of magnetic susceptibility (AMS) combined with structural analysis are used in this work with the aim to characterize the tectonic evolution of the Triassic flysch within the eastern Tethyan Himalaya Thrust Belt in SE Tibet. The attitude of the magnetic foliation and lineation are concordant with the planar and linear structures of tectonic origin defined by the preferred orientation of the iron-bearing silicates. Two different tectonic domains can be defined: (a) the southern domain is controlled by the Eohimalayan tectonic foliation (S1) recorded in the magnetic foliation which trends east-west and dips to the north; (b) the northern domain is dominated by the Neohimalayan magnetic foliation with WNW-ESE strike and dips to the south opposite to the vergence of the main structures. A slightly prolate magnetic ellipsoid has been found in between the two domains recording the intersection of S1 and the subtle development of the S2 tectonic foliation. Hinterland propagation of the deformation lead to the Great Counter backthrust generation, pointed out by the SSW steeply plunging magnetic lineation. Furthermore different orientations of magnetic foliation may indicate an Early Miocene c. 20° clockwise vertical-axis rotation
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
Deformation, kinematics and metamorphism of the South Tibetan Detachment System in the Dinggye section (Southern Tibet)
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