1,754,498 research outputs found
Stable isotope stratigraphy of ODP Site 167-1014
No full textLate Quaternary oxygen (d18O) and carbon (d13C) isotopic records for the benthic foraminifer Uvigerina and the planktonic foraminifer Globigerina bulloides are presented for the upper 20 meters composite depth sediment sequence of Ocean Drilling Program Site 1014, Tanner Basin, in the outer California Borderland province. The benthic oxygen isotopic record documents a continuous >160-k.y. sequence from marine isotope Stage (MIS) 6 to the present day. The record closely resembles other late Quaternary North Pacific benthic isotope records, as well as the well-dated deep-sea sequence (SPECMAP), and thus provides a detailed chronologic framework.
Site 1014 provides a useful record of the California response to climate change as it enters the southern California Border-land. Sedimentation rates are relatively constant and high (~11.5 cm/k.y. ). The planktonic foraminiferal record is well pre-served except during marine isotope Substages 5b and 5d, when normally high G. bulloides abundance is strongly diminished as a result of dissolution. The planktonic oxygen isotopic shift of ~3 per mil between the last glacial maximum and the Holocene suggests a surface water temperature shift of <7°C, similar to estimates from Hole 893A (Leg 146) to the north. Unlike Santa Barbara Basin, G. bulloides d18O values during the last interglacial (MIS 5) at Site 1014 were significantly higher than during the Holocene. In particular, marine isotope Substage 5e (Eemian) was ~0.8 per mil higher. This is unlikely to reflect a cooler Eemian but is instead the result of preferential dissolution of thin-shelled (low d18O) specimens during this interval. In this mid-depth basin, a large benthic d18O shift during Termination I suggests dramatic temperature and salinity changes in response to switches in the source of North Pacific Intermediate Water.
Although d13C values of the planktonic foraminifer G. bulloides are in disequilibria with seawater and hence interpretations are limited, the G. bulloides record exhibits several negative d13C excursions found at other sites in the region (Sites 1017 and 893). This indicates a response of G. bulloides d13C to regional surface water processes along the southern California margin. A general increase in benthic carbon isotopic values (–1.75 per mil to –0.75 per mil) in Tanner Basin during the last 200 k.y. is overprinted with smaller fluctuations correlated with climate change. The coolest intervals during the last glacial maximum (MISs 2 and 4) exhibit lower benthic d13C values, which correlate with global 13C shifts. The opposite relationship is exhibited during the last interglacial before 85 ka, when lower benthic d13C values are associated with warmer intervals (marine isotope Substages 5c and 5e) of the last interglacial. These time intervals were also marked by decreased intermediate water ventilation. Increased dissolution and organic accumulation during Substages 5b and 5d are anticorrelated with the benthic d13C record. These results suggest that a delicate balance in intermediate water d13C has existed between the relative influences of global 13C and regional ventilation changes at the 1165-m water depth of Site 1014
Santa Fe (ATSF) 1014
No full textA photograph print showing Santa Fe (ATSF) 1014, 2-6-2 (BLW) class 1014, Newton, KS
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
. 1014 Año 21 (2022) febrero. El Tlacuache
No full textDurante la temporada de lluvias el paisaje en los Altos de Morelos se transforma, los campos se cubren de distintas tonalidades de verde y es común observar el ir y venir de personas montadas a caballo, conduciendo tractores y camionetas de carga. La apertura temporal de establecimientos de venta de agroquímicos también se vuelve una constante.- El pueblo de la lluvia en los Altos de Morelos por Karina Ramírez Villaseñor.La milpa. Yecapixtla, Morelos. Junio 2012. Karina Ramírez. Paisaje oaxaqueño. Tejuapan, Oaxaca. Abril 2015. Ana Cecilia Campos Cabrera.Estrada Lima Quetzalli (2009), “La expansión del mercado de trabajo morelense hacia tierras del sureste mexiquense y sus centros de contratación” en Buscando la vida, Sánchez Saldaña Kim y Saldaña Ramírez Adriana (coords.), UAEM, Plaza y Valdés, pp. 61-86.Guzmán Gómez Elsa y León López Arturo (2008), Campesinos Jitomateros. Especialización y diversificada en los Altos de Morelos, Universidad Autónoma del Estado de Morelos, Plaza y Valdes Editores, México.Sánchez Saldaña Kim (2008), “Cosechas y peones en Morelos: especialización y segmentación en los mercados de trabajo rural”, en Análisis Económico, vol. XXIII, núm. 53, Universidad Autónoma Metropolitana Unidad Azcapotzalco, México, pp. 201-225.Sánchez Saldaña Kim (2009), “Introducción”, en Buscando la vida, Sánchez Saldaña Kim y Saldaña Ramírez Adriana (coords.), UAEM, Plaza y Valdés, pp. 9-18.Sánchez Saldaña, Kim y Betanzos O., Percy (2009), “Prácticas locales, dependencias globales y uso de agroquímicos en los altos de Morelos”, en Buscando la vida, Sánchez Saldaña Kim y Saldaña Ramírez Adriana (coords.), UAEM, Plaza y Valdés, pp. 87-120
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
CIL:1014
No full textThe purpose of the dataset C. elegans muscle aging is to deduce the age of the nemathode based on images of muscles. Images of C. elegans were taken at different chronological ages. This image is part of the day 1 data set. Note that the morphological and chronological ages are not fully correlated due to the variability among individuals even though the individuals are genetically identical. The source for the dataset is Laboratory of Genetics/NIA/NIH
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