1,722,583 research outputs found
Summertime elemental mercury exchange of temperate grasslands on an ecosystem-scale
Full text linkIn order to estimate the air-surface mercury exchange of grasslands in temperate climate regions, fluxes of gaseous elemental mercury (GEM) were measured at two sites in Switzerland and one in Austria during summer 2006. Two classic micrometeorological methods (aerodynamic and modified Bowen ratio) have been applied to estimate net GEM exchange rates and to determine the response of the GEM flux to changes in environmental conditions (e. g. heavy rain, summer ozone) on an ecosystem-scale. Both methods proved to be appropriate to estimate fluxes on time scales of a few hours and longer. Average dry deposition rates up to 4.3 ng m(-2) h(-1) and mean deposition velocities up to 0.10 cm s(-1) were measured, which indicates that during the active vegetation period temperate grasslands are a small net sink for atmospheric mercury. With increasing ozone concentrations depletion of GEM was observed, but could not be quantified from the flux signal. Night-time deposition fluxes of GEM were measured and seem to be the result of mercury co-deposition with condensing water. Effects of grass cuts could also be observed, but were of minor magnitude
METEOROLOGICAL STUDY OF TYPHOON 7709
No full textThe Typhoon 7709 (The Okinoerabu Typhoon, BABE) hit Amami Islands in September1977 and brought about serious damages to Okinoerabu Island. The present paper describes thestructure of the Typhoon 7709 after the results of the expedition to this area. The eye of the ty-phoon passed just above the Okinoerabu Island and the maximum wind speed at the OkinoerabuWeather Station is estimated as 46 m/s, though the record of wind speed is not obtained due to thetrouble of the instrumentation. The pressure distribution was obtained fairly close to the centerof the typhoon and the results of objective analysis has good agreement with the observed values.The Typhoon 7709 (The Okinoerabu Typhoon, BABE) hit Amami Islands in September1977 and brought about serious damages to Okinoerabu Island. The present paper describes thestructure of the Typhoon 7709 after the results of the expedition to this area. The eye of the ty-phoon passed just above the Okinoerabu Island and the maximum wind speed at the OkinoerabuWeather Station is estimated as 46 m/s, though the record of wind speed is not obtained due to thetrouble of the instrumentation. The pressure distribution was obtained fairly close to the centerof the typhoon and the results of objective analysis has good agreement with the observed values
[Texas & Pacific Railway, Engine Drawing Card, Sketch No. 7709]
No full textThis engine drawing card was created for Texas & Pacific Railway, Class 14-50 1/4E-. Section J-14 1/4E-. Sketch 7709. Copy Spec. C-
SUPERSEDED - Codebook used to categorise media shown in corpus metadata
No full text## This item has been replaced by the one which can be found at https://doi.org/10.7488/ds/7709 ## Codebook detailing how media items were coded in corpus metadata file. Details codes used for country, source, continent, medium, type of media, geographic market/reach, and ownership/funding model.This codebook describes the codes used in the corpus metadata file (FullCorpusMetadata.xlsx)
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
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