1,720,996 research outputs found
FIGURE 8 in An abelisauroid dinosaur with a non-atrophied manus from the Late Cretaceous Pari Aike Formation of southern Patagonia
No full textFIGURE 8. Strict consensus tree depicting the phylogenetic relationships of Austrocheirus isasii among ceratosaurian theropods. Numbers separated by a backslash are bootstrap frequencies (resampling analysis carried on with 5000 replications), absolute frequencies on the left and frequency differences (GC) on the right. Isolated numbers at each node are decay indexes. Abbreviations: Abeli, Abelisauroidea; Aver, Averostra.Published as part of Ezcurra, Martín D., Agnolin, Federico L. & Novas, Fernando E., 2010, An abelisauroid dinosaur with a non-atrophied manus from the Late Cretaceous Pari Aike Formation of southern Patagonia, pp. 1-25 in Zootaxa 2450 on page 14, DOI: 10.5281/zenodo.20471
FIGURE 9 in An abelisauroid dinosaur with a non-atrophied manus from the Late Cretaceous Pari Aike Formation of southern Patagonia
No full textFIGURE 9. Key apomorphic characters of Austrocheirus isasii. Metacarpal III of Dilophosaurus wetherilli (A), Ceratosaurus nasicornis (B), and Austrocheirus isasii (C). Distal tibia of Dilophosaurus wehterilli (D), Velocisaurus uniqus (E), Austrocheirus isasii (F), and Majungasaurus (G). Character 104 (1): poor development of the metacarpal III flexor fossa, Character 106 (1): metacarpal III with dorsal margin of the distal articular condyles protruded directly above the collateral ligament pits. Character 107 (1): asymmetric distal condyles of metacarpal III. Character 115 (1): tibia with the scar of the ascending process of the astragalus bearing a vertical ridge. Character 116 (1) distal end of the tibia with a vertical astragalar facet. Not to scale. (A based on UCMP 37302; B based on USNM 4735; C and F based on MPM-PV 10003; D based on UCMP 77270; E based on MUCPv 41; G based on Carrano 2007).Published as part of Ezcurra, Martín D., Agnolin, Federico L. & Novas, Fernando E., 2010, An abelisauroid dinosaur with a non-atrophied manus from the Late Cretaceous Pari Aike Formation of southern Patagonia, pp. 1-25 in Zootaxa 2450 on page 15, DOI: 10.5281/zenodo.20471
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
The basal ornithopods and iguanodonts (Dinosauria, Ornithischia) from the Cretaceous of Argentina and Antarctica
No full textEn esta tesis se revisan en forma comparada 5 especies de dinosaurios ornitópodos del Cretácico Superior de Patagonia (Notohypsilophodon comodorensis, Gasparinisaura cincosaltensis, Talenkauen santacrucensis, Anabisetia saldiviai y “Loncosaurus argentinus”) y Antártida (ornitópodo innominado). Se realizó un análisis filogenético integrando a todos los taxones mencionados. El resultado obtenido permitió reconocer dos clados monofiléticos de ornitópodos sudamericanos: uno conformado por los ornitópodos basales Notohypsilophodon + Gasparinisaura, y otro clado constituido por los driomorfos basales Talenkauen + Anabisetia + espécimen innominado de Antártida y probablemente “Loncosaurus”. Los driomorfos de Patagonia presentan notables semejanzas apomórficas con los ornitópodos documentados en la Península Antártica, tanto en la construcción del cuello como de las patas. Esto, sumado a similitudes en el tamaño general del cuerpo, nos hace suponer que habrían cumplido un rol ecológico similar. Esto habla en favor de la presencia de un grupo de ornitópodos de mediano tamaño ampliamente distribuido en esta región austral de Gondwana. Esta distribución paleobiogeográfica de los ornitópodos contrasta con aquella de otros grupos de dinosaurios herbívoros, los saurópodos, profundamente diversificados y con un amplio rango de tamaños en Patagonia, pero que hasta el momento sin registros en Antártida. La identificación de los dos linajes citados previamente, indica que la diversificación de los ornitópodos cretácicos de Patagonia fue mucho más amplia de lo imaginado. Esos dos linajes, uno de ornitópodos basales y otro de driomorfos basales, muestran rasgos derivados no documentados en sus respectivos parientes del Jurásico y Cretácico de Laurasia, lo que hace suponer una larga historia evolutiva de estos clados en los continentes australes.This thesis comparatively reviews 5 species of ornithopod dinosaurs from the Upper Cretaceous in Patagonia (Notohypsilophodon comodorensis, Gasparinisaura cincosaltensis, Talenkauen santacrucensis, Anabisetia saldiviai and “Loncosaurus argentinus”), and Antarctica (innominated ornithopod). A phylogenetic analysis has been made considering all the mentioned taxa. The results showed two monophyletic clades of South American ornithopods: the basal ornithopods Notohypsilophodon + Gasparinisaura and the basal dryomorphs Talenkauen + Anabisetia + innominated specimen from Antarctica, and probably “Loncosaurus”. The Patagonian dryomorphs, show outstanding apomorphic resemblances with the ornithopods documentated in Antarctic Peninsula, not only the neck, but of the limbs. This, and the similarities in the general body size, suggest us to suppose that they could have been played a similar ecologic rol. This of the presence of a group of median size ornithopods widely distributed in the austral region of Gondwana. This paleobiogeographic distribution of the ornithopods, contrasts with that of the other groups of herbivore dinosaurs, the sauropods, deeply diversified and with a wide range of sizes in Patagonia, but to this moment, without any representants in Antarctica. The identification of the two lineages previously citated, indicate that the diversification of the Cretaceous ornithopods from Patagonia has been too much wider than we have ever thought. These lineages, one of basal ornithopods and other of basal drymorphs, show derived features not documented in their respective relatives from the Jurassic and Cretaceous of Laurasia, making us suppose a large evolutive history of these clades in the austral continents.Fil: Cambiaso, Andrea Verónica. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina
Fig. 1 in First monotreme from the Late Cretaceous of South America
No full textFig. 1 Images of Patagorhynchus pascuali, MPM-PV-23087. Lower molar 2 and part of the right jaw, in a, occlusal view; b, medial/lingual view; c, lateral/labial view; d, posterior view; e, anterior view. Scale bar: length 2 mm. Abbreviations, ac, anterior cingulid; alv, alveolus; ant, anterior; ar, anterior root; hy, hypoconid; hl, hypoconulid; lapcc, labial posterior cingular cusp; liacc, lingual anterior cingular cusp; me, metaconid; mv, mid-valley; NC1, neomorphic cusp 1; pa, paraconid; pc, posterior cingulid; pr, protoconid; prt, posterior root.Published as part of Chimento, Nicolás R., Agnolín, Federico L., Manabe, Makoto, Tsuihiji, Takanobu, Rich, Thomas H., Vickers-Rich, Patricia & Novas, Fernando E., 2023, First monotreme from the Late Cretaceous of South America, pp. 1-6 in Communications Biology (146) 6 on page 2, DOI: 10.1038/s42003-023-04498-7, http://zenodo.org/record/766499
- …
