1,721,019 research outputs found
Doppler Wind Lidar vertical wind profiles at Zurich, Switzerland (ZVBZ)
No full textThis collection contains daily vertical wind profiles measured by a WindCube 100 Doppler wind Lidar located at the "VBZ Zentralwerkstätte" (ZVBZ) site in Zurich, Switzerland, between 2022-09-08 and 2023-04-04. The site, collection of data and the variables are described in ICOS Cities deliverable report D3.15
Doppler Wind Lidar vertical wind profiles at Zurich, Switzerland (Hard2)
No full textThis collection contains daily vertical wind profiles measured by a Windranger 200 Doppler wind Lidar located at the "Hardau II Tangoschule" (Hard2) site in Zurich, Switzerland, between 2022-07-07 and 2023-04-12. The site, collection of data and the variables are described in ICOS Cities deliverable report D3.15
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
Radar - wind profiler data of RACLETS field campaign
No full text<p>Please contact Maxime Hervo from MeteoSwiss for information about the data set.</p>
LIDAR - Wind profiler data of RACLETS field campaign
No full text<p>Please contact Maxime Hervo from MeteoSwiss for information about the data set.</p>
Study of the optical and radiative properties of aerosols in real atmosphere : Impact of hygroscopicity
No full textEn atmosphère naturelle, l’eau est l’un des facteurs contribuant fortement à la masse des particules d’aérosol. Ceci va fortement modifier les propriétés optiques et radiatives des aérosols. Cet impact a été calculé à partir de plus de 2 ans de mesures sur le site ACTRIS/GAW du Puy de Dôme (PdD, 1565m). La distribution en taille, l’extinction et l’hygroscopicité mesurées au PdD ont été combinées pour calculer les propriétés optiques et radiatives, sèches ou humides. Pour chaque propriété, le facteur d’accroissement hygroscopique (f) a été estimé à l’aide d’un code de Mie. La longue série temporelle a permis de paramétrer l’évolution en fonction de l’humidité des propriétés optiques de différents types d’aérosols. Pour un aérosol d’origine océanique qui s’est mélangé avec des aérosols anthropiques, le coefficient de diffusion augmente plus de 4.4 fois si il est placé à 90% d’humidité. Le forçage radiatif va évoluer en conséquence et sera 2.8 fois plus élevé à 90% d’humidité que pour une atmosphère sèche (1.8 à humidité ambiante). Cette longue série de mesures a également permis de montrer, pour la première fois à notre connaissance, la forte variation saisonnière de ce paramètre. Ce manuscrit présente également une méthode originale pour calculer la masse d’aérosols volcaniques à partir de mesures LIDAR et in situ. Lors de l’éruption du volcan Islandais Eyjafjalla en Mai 2010, la masse d’aérosols volcaniques au dessus de Clermont a été estimée de 655±23μg.m-3.Water contributes significantly to the aerosol mass under ambient conditions of relative humidities, and thus may significantly impact their optical and radiative properties and direct effect. In the present work, the impact of the aerosol hygroscopicity on its optical properties is evaluated from a set of instrumentation located at the ACTRIS/GAW Puy de Dôme station (PdD, 1465m) over two years of measurements in 2010 and 2011. In situ size distributions, extinction and hygroscopicity measurements are combined to retrieve the aerosol refractive index, both dry and wet. For each optical property the enhancement factor (f) due to hygroscopicity can be computed using Mie calculations. The long data set available enables us to generate parameterisations of optical properties enhancement as a function of relative humidities for different aerosol types. At 90% humidity, fσsca is more than 4.4 for marine aerosol that have mixed with a pollution plume. Consequently, the aerosol radiative forcing is estimated to be 2.80 times higher at RH=90% and 1.75 times higher at ambient RH when hygroscopic growth of the aerosol is considered. For the first time this study highlight the high seasonal variability of this impact. The manuscript also presents an original method of mass inversion for volcanic aerosols with the synergy of in situ and LIDAR measurements. The calculated mass of volcanic particle transported over Clermont during the eruption of Eyjafjalla in May 2010 was up to 655±23μg.m-3
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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