1,758,329 research outputs found
Ytterbium-doped tantalum pentoxide waveguide lasers
No full textWe have demonstrated a Yb:Ta2O5 waveguide laser fabricated by RF magnetron sputtering on oxidised silicon. The waveguide laser was end-pumped with a laser diode at 977 nm and lasing was observed between 1015 and 1020 nm. The launched pump power threshold and slope efficiency were measured to be ~25 mW and 1.78 %, respectively
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
(Table 1) Alkenone concentration, UK'37 index and derived sea surface temperatures for ODP Site 167-1020
No full textUk'37 sea-surface temperature (SST) estimates obtained at ~2.5-k.y. resolution from Ocean Drilling Program Site 1020 show glacial-interglacial cyclicity with an amplitude of 7°-10°C over the last 780 k.y. This record shows a similar pattern of variability to another alkenone-based SST record obtained previously from the Santa Barbara Basin. Both records show that oxygen isotope Stage (OIS) 5.5 was warmer by ~3°C relative to the present and that glacial Uk'37 temperatures warm in advance of deglaciation, as inferred from benthic d18O records. The alkenone-based SST record at Site 1020 is longer than previously published work along the California margin. We show that warmer than present interglacial stages have occurred frequently during the last 800 k.y. Alkenone concentrations, a proxy for coccolithophorid productivity, indicate that sedimentary marine organic carbon content has also varied significantly over this interval, with higher contents during interglacial periods. A baseline shift to warmer SST and greater alkenone content occurs before OIS 13.
We compare our results with those from previous multiproxy studies in this region and conclude that SST has increased by ~5°C since the last glacial period (21 ka). Our data show that maximum alkenone SSTs occur simultaneously with minimum ice volume at Site 1020, which is consistent with data from farther south along the margin. The presence of sea ice in the glacial northeast Pacific, the extent of which is inferred from locations of ice-rafted debris, provides further support for our notion of cold surface water within the northern California Current system, averaging 7°-8°C cooler during peak glacial conditions. The cooling of surface water during glacial stages most likely did not result from enhanced upwelling because alkenone concentrations and terrestrial redwood pollen assemblages are consistently lower during glacial periods
Variations on the Author
Get PDF“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
. 1020 Año 21 (2022) marzo. El Tlacuache
No full textLas congregaciones poblacionales de las comunidades indígenas se efectuaron en el en- torno conventual y permitieron la configuración de las llamadas republicas de indios a lo largo del siglo XVI. Posteriormente las composiciones de tierras efectuadas en el siglo XVII definieron los elementos básicos que han impactado los límites y vocaciones de muchas regiones y municipios incluso hasta el día de hoy, respetando funda- mentalmente los fundos legales de los pueblos cuyo eje era en muchos casos, la casa conven- tual. En el siglo XVIII estos recintos se seculari- zaron y volvieron al control del clero diocesano, cambiando el motivo fundamental que daba for- ma a los conventos, pues habían sido construidos para comunidades de frailes, no para presbíteros aislados en cada templo.- Un muerto chiquito del siglo XIX en Ocuituco, Morelos por Raúl Francisco González Quezada. Palabras cortas para un amigo de la vida por Víctor Hugo Valencia Valera.Juguete cerámico con silbato con la figura de un león localizado en la ofrenda infantil en Ocuituco. Cruz atrial floreada que no es original del siglo XVI, pero que fue elaborada con fragmentos diversos de elementos arquitectónicos antiguos. Al fondo el templo y casa del convento agustino de Santiago Apóstol en Ocuituco, Morelos Autora: Flor de María Rodríguez Silva, noviembre de 2021.Floss, Harald 2015 The Oldest Portable Art: the Aurignacian Ivory Figurines from the Swabian Jura (Southwest Germany). En Aurignacian Genius: Art, Technology and Society of the First Modern Humans in Europe. P@lethnology, No. 7. White R., Bourrillon R. (editor). Pp. 315-329. New York University.García Maya, Lilian Ivette 2019 Informe Final Salvamento Arqueológico Convento de Santiago Apóstol Ocuituco, Morelos, efecto de la intervención de restauración del conjunto conventual dentro del Programa de Empleo Temporal (PET) 2011, 2012 y 2013. Volumen VI. Análisis Antropofísico de la colección de restos óseos humanos efecto del Rescate Arqueológico Recimentación del Muro Norte del Templo de Santiago Apóstol, Ocuituco. (2013). Informe inédito en el Archivo de la Coordinación Nacional de Arqueología, Ciudad de México.González Quezada, Raúl Francisco; María del Consuelo Pineda Yáñez; Obed Campos Castañeda y Humberto Andrade Pineda. 2011 Día de muertos en Ocuituco, Morelos. Suplemento Cultural El Tlacuache, Periódico La Jornada Morelos. No. 491:1-2. González Quezada, Raúl Francisco 2015 El convento agustino de Santiago Apóstol en Ocuituco, un proceso de patrimonialización. Suplemento Cultural El Tlacuache, Periódico La Jornada Morelos. No. 671:1-4.Krutitskaya, Anastasia. 2014 Modo de rezar el Rosario: una forma de la contemplación dirigida en la Nueva España del siglo XVII. Acta Poética. Vol. 35, No.2: 215-233. 1970 Guidelines for Collecting China Buttons. The National Button Society of America, Pennsylvania.Leiva García, Pavel Carlos y María Judith Galicia Flores 2019 Costumbres mortuorias en un espacio funerario tlahuica, en Yautepec, Morelos. En XX Encuentro Iberoamericano de Valorización y Gestión de Cementerios Patrimoniales. Los cementerios como recurso cultural, educativo y turístico. Málaga (España). Francisco José Rodríguez Marín (coordinación). Pp. 1-32. Universidad de Málaga.Marinetto Sánchez, Purificación 2020 La Representación Figurativa en el Mundo Musulmán. Junta de Andalucía. Consejería de Cultura y Patrimonio Histórico Patronato de la Alhambra y Generalife.Márquez Morfín, Lourdes y Patricia Olga Hernández Espinoza 2016 La esperanza de vida en la ciudad de México (siglos XVI al XIX). Secuencia. No. 96:6-44.Medina González, Isabel; Karla Martínez López y Osiris Quezada Ramírez
2015 Informe de las actividades de conservación arqueológica de los complejos funerarios de Ocuituco y Huejotengo, Estado de Morelos, México. Informe inédito ENCRyM INAH. CDMX.Moctezuma Yano, Patricia. 2013 Ser alfarero en Amozoc, Puebla. La construcción de una identidad laboral artesanal. Cuicuilco. No. 58:109-138.Moguel Pasque, María Carolina. 2017 Un empresario agrícola porfirista en Morelos. El caso de Luis García Pimentel. Secuencia. No. 97:170-199.Rubial, Antonio. 1981 Santiago de Ocuituco: La organización económica de un convento rural agustino a mediados del siglo XVI. Estudios de Historia Novohispana. No. 7:2-28.Ruiz González, Judith Lizbeth. 2014 Las momias del período colonial de Tlayacapan, Morelos. Un estudio biosocial. Tesis Maestría en Estudios Mesoamericanos. UNAM, CDMX.Silva Ortiz, Luz María. 2019 Crónica de seis siglos de sismos en México: lecciones aprendidas y perspectivas. Asociación Mexicana de Instituciones de Seguros, A.C. Ciudad de México.Sancho Cubin, Natalia. 2016 Verdigrís, pigmento histórico de cobre:estudio de su composición y color a partir de reproducciones de antiguas recetas. Tesis doctoral Universidad Complutense de Madrid.Sprague, Roderick.2002 China or Prosser Button Identification and Dating. Historical Archaeology. Vol. 36, No.2:111-127
Appropriate Similarity Measures for Author Cocitation Analysis
Get PDFWe 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
Get PDFWe 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
15-17 sept. 2016 // International workshop about PHerc. 1020 (Naples)
No full textFrom 15 to 17 September an international workshop about PHerc. 1020 ([Early Stoic Author], Unknown Work) will take place in Naples (see poster attached). We shall discuss together the new critical text of several inedited columns of this valuable text reconstructed by Graziano Ranocchia and Michele Alessandrelli in the framework of the ERC Starting Grant 241184-PHerc (www.pherc.eu). http://www.pherc.eu
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