1,743,262 research outputs found
Polarity chron boundaries and foraminiferal 87Sr/86Sr ratios of ODP Sites 162-986 and 162-987
No full textCores recovered at Sites 986 and 987 comprise glacial fan sedimentation associated with the Svalbard-Barents Sea and Greenland Ice Sheets, respectively. At Site 986, the top 150 m and the basal 250 m yielded interpretable magnetic stratigraphies. The record from the intervening 550 m is compromised by drilling-related core deformation, poor recovery, and numerous debris flows. The uppermost 150 m appears to record the Brunhes/Matuyama boundary and the Jaramillo Subchron. The base of the drilled section (at ~950 meters below seafloor [mbsf]) is interpreted to lie within the Matuyama Chron (age <2.58 Ma) with an apparent normal polarity interval in the ~730-750 mbsf interval. Dinoflagellate cyst biostratigraphy and Sr isotopic ratios are consistent with a Matuyama age for the base of the drilled section and with the normal polarity interval as the Olduvai Subchron. On the other hand, the last occurrence of Neogloboquadrina atlantica (sinistral) and the last common occurrence of the warm-dwelling Globigerina bulloides at 647-650 mbsf in Hole 986D indicate an age for this level of ~2.3 Ma, inconsistent with the designation of the Olduvai Subchron in the ~730-750 mbsf interval. If the age at 647-650 mbsf in Hole 986D is taken as 2.3 Ma and the base of the hole lies within the Matuyama Chron, then the sedimentation rate in the basal 300 m of the cored section averages 1 m/k.y.
At Site 987, the magnetic stratigraphy is fairly unambiguous throughout the section and yields an age of 7.5 Ma (Chron 4n) for the base of the drilled section. The paucity of calcareous and siliceous microfossils precludes biostratigraphic corroboration of the magnetostratigraphic interpretation, although dinoflagellate cysts provide general support, particularly at the base of the section. The age model indicates relatively low sedimentation rates (~5 cm/k.y.) at the base of the section with rates at least four to five times greater during intervals of debris flows at ~5-4.6 and ~2.6 Ma
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
El Tlacuache Núm. 987 (2021). 987 Año 20 (2021) julio. El Tlacuache
No full text¿Cuándo las actividades humanas comenzaron a afectar el planeta¿ Es una pregunta que no es sencilla de responder. La mayoría de las veces las mediciones o recuentos globales se refieren a períodos del pasado reciente de la humanidad, mientras que, hacia el pasado, los registros se ubican en afectaciones locales o regionales. Con lo cual, desde hace pocos años, se han iniciado diversos ensayos para elaborar modelos que nos permitan responder la pregunta a la que hice referencia inicial.- La actividad humana rn rl pasado: un registro por Eduardo CoronaMartínez. - Arqeuología y neurología: unejemplo de aproximación por Caludia Itzel Alvarado León.Pintura rupestre Sierra la Giganta, Baja California Sur (https://images.app.goo.gl/UJFfJzSGQneACpFk8)ArchaeoGLOBE Project. 2019. Archaeological assessment reveals Earth’s early transformation through land use. Science, 365, 897–902.Corona-M. E. 2019. Diversas facetas de las interacciones entre los humanos y los animales: algunos registros en las Américas. Etnobiología 17(2): 5-10.Ellis, R. y cols. 2021. People have shaped most of terrestrial nature for at least 12,000 years. PNAS 118(17): e2023483118.Roberts, N. 2019. How humans changed the face of Earth. Science: 10.1126/science.aay4627Red Temática de Patrimonio Biocultural: https://patrimoniobiocultural.com/Castillo, N. (2012). La investigación interdisciplinaria, fundamental para la arqueología moderna http://ciencia.unam.mx/leer/106La_investigacion_interdisciplinaria_fundamental_para_la_arqueologia_modernaDíaz-Andreu, M. y L. Coltofean (2020). Hacia una historia de la interdisciplinariedad en la Arqueología española introduciendo una nueva perspectiva. Veleia: Revista de prehistoria, historia antigua, arqueología y filología clásicas 37:13-32 https://ojs.ehu.eus/index.php/Veleia/article/view/21063/19629Pank, T. (2019). A Newly Discovered Drawing of a Neo-Assyrian Demon in BAM 202 Connected to Psychological and Neurological Disorders. Le Journal de Médecines 33:1-31 h t t p s : / / w w w . a c a d e m i a . e d u / 4 0 8 7 5 3 1 2 /Arboll_2019_A_Newly_Discovered_Drawing_of_a_Neo_Assyrian_Demon_in_BAM_202_Connected_to_Psychological_and_Neurological_Disorders_JMC_33_pp_1_31Reynolds, E. H. y J. V. Kinnier Wilson (2014). Neurology and psychiatry in Babylon. Brain Journal of Neurology 137: 2611-2619
Les Capétiens : 987-1328
No full textCouronnement de Philippe AugusteEn 987, le dernier roi carolingien, Louis V, meurt sans héritier direct. L’archevêque de Reims fait appel à une assemblée de grands seigneurs pour élire son successeur. L’élection de Hugues Capet le 1 er juin 987 par les grands seigneurs francs inaugure la dynastie des Capétiens, mettant fin au règne des Carolingiens. Afin d’assurer la pérennité de sa succession, il fait sacrer son fils Robert le pieux. Cette nouvelle pratique va assurer la pérennité de la dynastie capétienne. À cette époque, les anciens édifices religieux, détruits par de nombreux incendies, sont reconstruits en pierre et se couvrent de voûtes caractéristiques de l’art roman. Les Capétiens directs gouvernent jusqu’en 1328, puis c’est au tour des Capétiens Valois de prendre le trône de France. L’élection en 987 marque donc la naissance d’une longue dynastie de rois de France qui court jusqu’au XIX e siècle.téléchargeabl
Santa Fe (ATSF) 987
No full textA photograph print showing the Santa Fe (ATSF) 987, 2-10-0 (BLW). Back of photo details locomotive's specifications
novel.987.phages.genomes.zip
No full textContigs of novel Streptococcus 987 group phages from paper High level of interaction between phages and bacteria in an artisanal raw milk cheese microbial community.</p
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
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