1,723,502 research outputs found
A UBV study of the field of NGC 7790
No full textvi, 106 leaves : ill. ; 28 cm.Bibliography: leaves 102-105.This thesis presents a UBV study of the field of the open cluster NGC 7790, which has three Cepheids within its boundaries. Photographic plates taken at CFHT were measured on an Astromechanics Iris Photometer. The distance modulus of the cluster was found to be 12.25 [plus-minus sign] 0.10. A trend in reddening with spectral type was detected; (E [subscript B-V] = 0.40 [plus-minus sign] 0.06 s.d. for stars with (B-V) [subscript zero] > 0.10 and (E [subscript B-V]) = 0.57 [plus-minus sign] 0.07 s.d. for stars with (B-V) [subscript zero] <0.10. The implied luminosities of the Cepheids in NGC 7790 from the calculated cluster distance are in agreement with recent calibrations of the period-luminosity and period-luminosity-colour relations
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
CCD standards for U and I in the open cluster NGC 7790
No full textPhotometric U and I standard sequences in the field of the open
cluster NGC 7790 are presented. The intention is to achieve wide
ranges in magnitude and colour, making these sequences suitable
for calibrating deep CCD photometry. The 84 standard stars
extend the BVR sequences of Odewahn et al. ([CITE]) to the
near UV and IR, respectively
Konsep Dhalâl dalam al-Qur`ân: Studi Komparatif Penafsiran Muḫammad Ḫusein Ṯabâṯabâ`î dan Muḫammad Mutawallî Sya'râwî
No full textSkripsi ini mengkaji suatu bahasan dengan topik dhalâl yang dikaji melalui perbandingan penafsiran antara Muḫammad Ḫusein Ṯabâṯabâ`î dengan Muḫammad Mutawallî Sya‟râwî. Hasil temuan dari kajian ini menunjukkan bahwa Ṯabâṯabâ`î di dalam Tafsir al-Mizân dan Sya‟râwî di dalam Tafsîr al-Sya‟râwî memiliki perbedaan sekaligus persamaan ketika menafsirkan beberapa ayat yang mengandung tema dhalâl. Hasil ini memperkuat teori yang menyatakan bahwa interpretasi ataupun penafsiran terhadap ayat-ayat al-Qur‟an dipengaruhi oleh latar belakang dan sudut pandang mufassirnya. Demikian pula halnya dengan penafsiran atas ayat-ayat yang mengandung tema dhalâl, latar belakang dan sudut pandang mufassir ikut mewarnai hasil dari penafsiran tersebut. Kedua sosok mufassir yang menjadi fokus dalam penelitian ini merupakan representasi dari dua pihak yang berseberangan, Syî‟ah di satu sisi dan Sunnî di sisi lain. Kedua mufassir dengan masing-masing karya tafsirnya ini merupakan hasil dari sebuah komunitas kontemporer di abad 20. Tafsir al-Mîzân adalah karya seorang tokoh mufassir Syî‟ah kontemporer Muẖammad Ḫusein Ṯabâṯabâ`î (w. 1399 H/ 1981 M), sedangkan Tafsîr al-Sya‟râwî adalah karya seorang tokoh mufassir Sunnî kontemporer Muẖammad Mutawallî Sya‟râwî (w. 1419 H/ 1998 M).
Kajian terhadap tafsir Ṯabâṯabâ`î dan Sya‟râwî dalam penelitian skripsi ini dilakukan dengan metode komparatif ataupun perbandingan antara penafsiran keduanya terhadap ayat-ayat al-Qur‟an yang mengandung term dhalâl. Perbandingan antara kedua tokoh mufassir ini tentu tidak dilakukan terhadap keseluruhan ayat-ayat dhalâl yang terdapat dalam al-Qur‟an, melainkan dibatasi penafsirannya pada ayat-ayat tertentu yang dipilih berdasarkan keumumannya dan lebih dominannya, serta sudah dapat mewakili pandangan Ṯabâṯabâ`î dan Sya‟râwî.
Hasilnya, penafsiran Ṯabâṯabâ`î dan Sya‟râwî mengenai ayat-ayat dhalâl tidaklah tunggal. Memang ada titik kesamaan di antara mereka bahwa dhalâl tergambar dalam bentuk kesesatan, hanya saja dalam menafsirkannya lebih lanjut mereka berbeda. Perbedaan tersebut menurut penulis dikarenakan kecendrungan dari sudut padang masing-masing mufassir dalam memberikan interpretasi terhadap dhalal, Ṯabâṯabâ`î umumnya tampak menafsirkan dhalâl secara eksplisit ayat ataupun tekstual pembicaraan ayatnya, sedangkan Sya‟râwî cendrung menafsirkannya berdasarkan pengertian bahasanya
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
The young open clusters King 12, NGC 7788, and NGC 7790: pre-main-sequence stars and extended stellar halos
No full textThe stellar contents of the open clusters King 12, NGC 7788, and NGC 7790 are investigated using MegaCam images. Comparisons with isochrones yield an age <20 Myr for King 12, 20-40 Myr for NGC 7788, and 60-80 Myr for NGC 7790 based on the properties of stars near the main-sequence turnoff (MSTO) in each cluster. The reddening of NGC 7788 is much larger than previously estimated. The luminosity functions (LFs) of King 12 and NGC 7788 show breaks that are attributed to the onset of pre-main-sequence (PMS) objects, and comparisons with models of PMS evolution yield ages that are consistent with those measured from stars near the MSTO. In contrast, the r\u2032 LF of main-sequence stars in NGC 7790 is matched to r\u2032 = 20 by a model that is based on the solar neighborhood mass function. The structural properties of all three clusters are investigated by examining the two-point angular correlation function of blue main-sequence stars. King 12 and NGC 7788 are each surrounded by a stellar halo that extends out to a radius of 5 arcmin ( 3c3.4 pc). It is suggested that these halos form in response to large-scale mass ejection early in the evolution of the clusters, as predicted by models. In contrast, blue main-sequence stars in NGC 7790 are traced out to a radius of 3c7.5 arcmin ( 3c5.5 pc), with no evidence of a halo. It is suggested that all three clusters may have originated in the same star-forming complex, but not in the same giant molecular cloud. \ua9 2012. The American Astronomical Society. All rights reserved..Peer reviewed: YesNRC publication: Ye
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