1,723,330 research outputs found
Close binary systems in regions of open clusters. I. V448 Cyg in NGC 6871
No full textПолучен новый ряд фотоэлектрических (UBVRI') наблюдений массивной затменной системы раннего спектрального класса V448 Cyg в рассеянном скоплении NGC 6871.Одержано новий ряд фотоелектричних (UBVRI') спостережень масивної затемнюваної системи раннього спектрального класу V448 Cyg в розсіяному скупченні NGC 6871.New photoelectric UBVRI' observations of the massive early type eclipsing system V448 Cyg in the open cluster NGC 6871 are obtained.Приношу благодарность А. В. Чернышеву, Т. П. Перегудовой, Г. Ю. Петрову за помощь при наблюдениях, Т. С. Полушиной за помощь при работе на ЭВМ «Наири-К», М. И. Лаврову за предоставленный пакет программ на языке БЕЙСИК и рецензенту за полезные советы
Close binary systems in regions of open clusters. I. V448 Cyg in NGC 6871
No full textПолучен новый ряд фотоэлектрических (UBVRI') наблюдений массивной затменной системы раннего спектрального класса V448 Cyg в рассеянном скоплении NGC 6871.Одержано новий ряд фотоелектричних (UBVRI') спостережень масивної затемнюваної системи раннього спектрального класу V448 Cyg в розсіяному скупченні NGC 6871.New photoelectric UBVRI' observations of the massive early type eclipsing system V448 Cyg in the open cluster NGC 6871 are obtained.Приношу благодарность А. В. Чернышеву, Т. П. Перегудовой, Г. Ю. Петрову за помощь при наблюдениях, Т. С. Полушиной за помощь при работе на ЭВМ «Наири-К», М. И. Лаврову за предоставленный пакет программ на языке БЕЙСИК и рецензенту за полезные советы
Catalog of 1600+ New Variables around V1821 Cyg in NGC 6871
No full text<p>Utilizing TESS data, the author has screened a small sky region of a one-degree radius centered on the known Scuti star V1821 Cyg within the young open cluster NGC 6871. The selected samples had TESS magnitude values ranging from 6 to 16 mag, matching the TESS premium targets exhibiting good quality photometry and effective temperature between 10000 and 6000 K, roughly corresponding to main sequence stars of spectral types A to F. Among the 3600 candidate stars surveyed, 1530 were discovered to be new variables of types Scuti, Doradus, Maia, eclipsing binary, rotational, and solar-like oscillators.</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
MOESM1 of Isolating promoters from Corynebacterium ammoniagenes ATCC 6871 and application in CoA synthesis
No full textAdditional file 1: Table S1. Primer sequences used in this study. Table S2. Comparison of different promoter activities in C. ammoniagenes ATCC 6871. Table S3. The sequences of identified promoters
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
Shock degree and graphite geothermometry in ureilites NWA 6871 and NWA 3140
Get PDFCarbon aggregates from two differently shocked ureilites were analyzed to gain insight into the shock transformation of graphite to diamond in ureilites, which happened when the ureilite parent body (UPB) was most likely destroyed by massive impact events. We present data for carbon aggregates from the highly shocked (U-S6) Northwest Africa (NWA) 6871 and the medium shocked (U-S3) NWA 3140. Both samples contain abundant carbon aggregates which were analyzed by X-ray diffraction and micro-Raman spectroscopy revealing the presence of close associations of (compressed) nanographite, micro- and nanodiamond, as well as Fe-rich phases. Graphite and diamond in NWA 6871 show shock indicators that are absent in NWA 3140. Based on Raman geothermometry on graphite, we calculated mean temperatures of 1368 ± 120 °C and 1370 ± 120 °C for NWA 3140 and NWA 6871, respectively. For comparison, a geothermometer based on the partitioning of Cr between olivine and low-Ca pyroxene was applied on NWA 3140, which yielded a temperature of only 1215 ± 16 °C. The graphite-based temperatures are the highest reported for graphite in ureilites so far and exceed calculated magmatic temperatures for ureilites from silicate- and chromite-based geothermometers. Graphite temperatures fall into the temperature field of catalytic diamond synthesis, which supports the hypothesis of direct transformation from graphite to diamond upon shock. Although the temperatures estimated seem to be independent of the shock degree, they can be ascribed to the shock event that destroyed the UPB
- …
