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6863-7587
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Bestandsverzeichnis zur Literaturwissenschaftlichen Sammlung (-)
6863-7587 (IX) ( - )
Cover ( - )
L: ab Landoldt, J. H. (450)
6863 bis 6900 (450)
6901 bis 7000 (454)
7001 bis 7100 (464)
7101 bis 7200 (474)
7201 bis 7300 (485)
7301 bis 7400 (495)
7401 bis 7500 (506)
7501 bis 7528 (516)
M: bis Mahnke, Dietrich (518)
7529 bis 7587 (518
Halberstadt C V (Av) 6863/18, Two-seat Armed Photographic Reconnaissance Airplane
No full textRear starboard side view of Halberstadt C.V (Av) 6863/18 with pilot sitting in cockpit. Image displayed (72 dpi JPEG), Master image (300 dpi TIFF)
Comparison of the PA23<i>phzR</i> and PA23-6863 regulons.
No full textVenn diagrams were generated using Venny 2.1 [45] to determine the overlap of up (A) and down (B) regulated genes between PA23phzR and PA23-6863.</p
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
An investigation into the effect of thickness of titanium dioxide and gold-silver nanoparticle titanium dioxide composite thin-films on photocatalytic activity and photo-induced oxygen production in a sacrificial system
No full textThin films of titanium dioxide and titanium dioxide with incorporated gold and silver nanoparticles were deposited onto glass microscope slides, steel and titanium foil coupons by two sol–gel dip-coating methods. The film's photocatalytic activity and ability to evolve oxygen in a sacrificial solution were assessed. It was found that photocatalytic activity increased with film thickness (from 50 to 500 nm thick samples) for the photocatalytic degradation of methylene blue in solution and resazurin redox dye in an intelligent ink dye deposited on the surface. Contrastingly, an optimum film thickness of [similar]200 nm for both composite and pure films of titanium dioxide was found for water oxidation, using persulfate (S2O82−) as a sacrificial electron acceptor. The nanoparticle composite films showed significantly higher activity in oxygen evolution studies compared with plain TiO2 films
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
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
Not an open cluster after all: the NGC 6863 asterism in Aquila
Get PDFContext. Shortly after birth, open clusters start dissolving; gradually
losing stars into the surrounding star field. The time scale for
complete disintegration depends both on their initial membership
and location within the Galaxy. Open clusters undergoing the
terminal phase of cluster disruption or open cluster remnants
(OCRs) are notoriously difficult to identify. From an observational
point, a combination of low number statistics and minimal contrast
against the general stellar field conspire to turn them into very
challenging objects. To make the situation even worst, random
samples of field stars often display features that may induce to
classify them erroneously as extremely evolved open clusters.
Aims. In this paper, we provide a detailed study of the stellar content
and kinematics of NGC 6863, a compact group of a few stars located
in Aquila and described by the Palomar Observatory Sky Survey as a
non existent cluster. Nonetheless, this object has been recently
classified as OCR. The aim of the present work is to either confirm
or disprove its OCR status by a detailed star-by-star analysis.
Methods. The analysis is performed using wide-field photometry in the UBVI
pass-band, proper motions from the UCAC3 catalogue, and high
resolution spectroscopy as well as results from extensive N-body
calculations.
Results. The spectra of the four brightest stars in this field clearly
indicate that they are part of different populations. Their radial
velocities are statistically very different and their spectroscopic
parallaxes are inconsistent with them being part of a single, bound
stellar system. Out of the four stars, only two of them have similar
metallicity. The color magnitude diagram for the field of NGC 6863
does not show any clear signature typical of actual open clusters.
Consistently, spatial scan statistics confirms the absence of any
statistically significant, kinematically supported over-density at
the purported location of NGC 6863.
Conclusions. Our results show that the four brightest stars commonly associated
to NGC 6863 form an asterism, a group of non-physically associated
stars projected together, leading to the conclusion that NGC
6863 is not a real open cluster
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