1,723,930 research outputs found
Bestimmung der einzelnen Messunsicherheitsanteile gemäß DIN EN ISO 6789-2:2017 : Leitfaden DKD-L 10-1
No full textIn der DIN EN ISO 6789-2:2017 Schraubwerkzeuge - Handbetätigte Drehmoment-Schraubwerkzeuge - Teil 2: Anforderungen an die Kalibrierung und die Bestimmung der Messunsicherheit (ISO 6789-2:2017), Deutsche Fassung EN ISO 6789-2:2017 wird ein Kalibrierverfahren beschrieben für Drehmoment-Schraubwerkzeuge inklusive der Bestimmung der Messunsicherheit. Um die Anwendung der Norm zu präzisieren, wurde der Leitfaden DKD-L 10-1 erstellt. Insbesondere wird die Bestimmung der Messunsicherheit mit statistischen Verfahren näher beschrieben. Da die praktische Anwendung der Norm im Vordergrund des Leitfadens steht, darf er nur angewendet werden, wenn der entsprechende Kalibrierschein nicht zur Weitergabe der Einheit dient
Determination of individual measurement uncertainty components according to DIN EN ISO 6789-2:2017 : Guide DKD-L 10-1
No full textThe standard DIN EN ISO 6789-2:2017 Assembly tools for screws and nuts - Hand torque tools - Part 2: Requirements for calibration and determination of measurement uncertainty (ISO 6789-2:2017), German version EN ISO 6789-2:2017 describes a calibration procedure for torque tools, including the determination of the measurement uncertainty. DKD-L 10-1 has been prepared to specify the application of the DIN standard. In particular, the determination of the measurement uncertainty by means of statistical methods is described in more detail. This DKD guide focuses on the practical application of the standard and may only be used if the corresponding calibration certificate does not serve to disseminate the unit
Auto-consistent metallicity and star formation history of the nearest blue compact dwarf galaxy NGC 6789
No full textWe present a detailed auto-consistent study of the nearest blue compact dwarf galaxy NGC 6789 by means of optical and ultraviolet (UV) archive photometry data and optical long-slit Intermediate dispersion Spectrograph and Imaging System-William Herschel Telescope (WHT) spectroscopy observations of the five brightest star-forming knots. The analysis of the spectra in all knots allowed the derivation of ionic chemical abundances of oxygen, nitrogen, sulphur, argon and neon using measures of both the high- and low-excitation electron temperatures, leading to the conclusion that NGC 6789 is chemically homogeneous with low values of the abundance of oxygen in the range 12+log(O/H) = 7.807.93, but presenting at the same time higher values of the nitrogen-to-oxygen ratio than expected for its metal regime. We used archival Hubble Space Telescope/Wide-Field Planetary Camera 2 (HST/WFPC2) F555W and F814W observations of NGC 6789 to perform a photometric study of the colourmagnitude diagram (CMD) of the resolved stellar populations and derive its star formation history (SFH), which is compatible with the presence of different young and old stellar populations whose metallicities do not necessarily increase with age. We fit the observed optical spectrum in all the five knots using the starlight code and a combination of single stellar populations following the SFH obtained from the CMD. We compare the resulting stellar masses and the relative fractions of the ionizing populations with a non-constrained SFH case. The properties of the younger populations were obtained using cloudy photoionization models, giving similar ages in all the knots in the range 36 Myr and the estimation of the dust absorption factor, which correlates with the observed GALEX far-ultravioletnear-ultraviolet colour indices. The total photometric extinction and dust-absorption corrected Ha fluxes were finally used to derive the star formation rates.http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000304599100030&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701Astronomy & AstrophysicsSCI(E)5ARTICLE1406-42142
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe 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
No full text“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
No full textWe 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
No full textWe 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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