Photodissociation of stilbene radical cation
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotodissociation of stilbene radical cationRobert Gooden and John I. BraumanCite this: J. Am. Chem. Soc. 1982, 104, 6, 1483–1486Publication Date (Print):March 1, 1982Publication History Published online1 May 2002Published inissue 1 March 1982https://doi.org/10.1021/ja00370a006RIGHTS & PERMISSIONSArticle Views229Altmetric-Citations19LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (509 KB) Get e-Alerts Get e-AlertsKeywords:
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Altmetrics, or alternative metrics, are forging a new way to capture the impact of not only articles, but also scholarly or research "products" by tracking them when they are mentioned online, such as in blogs or social media platforms. While altmetrics have a lot of potential, there are also some limitations preventing their full acceptance alongside traditional citation metrics. This column will explain the basics of altmetrics and altmetric tools, discuss some of the ways they can be used in libraries, and explore some possible concerns with this new metric. A list of resources for additional information is also included.
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Changes are occurring in scholarly communication as scientific discourse and research activities spread across various social media platforms. In this paper, we study altmetrics on the article and journal levels, investigating whether the online attention received by research articles is related to scholarly impact or may be due to other factors. We define a new metric, Journal Social Impact (JSI), based on eleven data sources: CiteULike, Mendeley, F1000, blogs, Twitter, Facebook, mainstream news outlets, Google Plus, Pinterest, Reddit, and sites running Stack Exchange (Q&A). We compare JSI against diverse citation-based metrics, and find that JSI significantly correlates with a number of them. These findings indicate that online attention of scholarly articles is related to traditional journal rankings and favors journals with a longer history of scholarly impact. We also find that journal-level altmetrics have strong significant correlations among themselves, compared with the weak correlations among article-level altmetrics. Another finding is that Mendeley and Twitter have the highest usage and coverage of scholarly activities. Among individual altmetrics, we find that the readership of academic social networks have the highest correlations with citation-based metrics. Our findings deepen the overall understanding of altmetrics and can assist in validating them.
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Статья посвящена итогам реставрации иконы XVII в. «Преподобных Сергия, Никона и Саввы» из Троицкого собора Свято-Троицкой Сергиевой Лавры. Рассматривается история происхождения иконы, приводятся сведения о предыдущих поновлениях и реставрациях. Кратко описывается ход последних реставрационных работ, результаты технико-технологических исследований и особенности иконографии. Долгое время сильно потемневший образ, находившийся под несколькими слоями записи, не обращал на себя внимание. Открытие этой иконы может послужить поводом для дальнейших искусствоведческих исследований. The article is devoted to the results of the restoration of the seventeenth century icon «St. Sergius, Nikon and Savva» from the Trinity Cathedral of the Holy Trinity Sergius Lavra. The history of the icon's origin is considered, and information about previous renewals and restorations is provided. The article briefly describes the course of recent restoration works and the results of the research on the technique and manufacturing, as well as the features of iconography. For a long time, the darkened icon, which was under several layers of recording, did not attract attention. The discovery of this icon can serve as a subject for new works on art history.
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Статья посвящена исследованию иконы «Суд иудеев над Иисусом Христом» из собрания русских икон при поддержке Фонда апостола Андрея Первозванного. Наличие палеосных святых свидетельствует о частном заказе данного образа, хотя крупный размер иконы явно указывает на её бытование в храме. Выбор столь оригинального сюжета, носящего «историко-дидактический» характер, привлек внимание исследователя той нетрадиционностью, которая выбивалась из привычного иконографического репертуара вкладных икон. В статье рассмотрены особенности стилистики и иконографии иконы. Выявлены стилистические аналоги, обоснована атрибуция и происхождение иконы из Стародубско-Ветcкого региона (Ветка). Показаны иконографические источники образа и их связь с народной гравюрой. Объяснено бытование иконы в старообрядческой среде. The article is devoted to the study of the icon «The Judgment of the Jews over Jesus Christ». Stylistic and iconographic features of the icon are considered. There were also revealed some stylistic analogues, as well as the attribution and the origin of the icon from the Starodubsk-Vetka region (Vetka). Iconographic sources of the image and their connection with folk engravingsare shown. The existence of the icon in the Old Believer environment is explained.
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Altmetric measurements derived from the social web are increasingly advocated and used as early indicators of article impact and usefulness. Nevertheless, there is a lack of systematic scientific evidence that altmetrics are valid proxies of either impact or utility although a few case studies have reported medium correlations between specific altmetrics and citation rates for individual journals or fields. To fill this gap, this study compares 11 altmetrics with Web of Science citations for 76 to 208,739 PubMed articles with at least one altmetric mention in each case and up to 1,891 journals per metric. It also introduces a simple sign test to overcome biases caused by different citation and usage windows. Statistically significant associations were found between higher metric scores and higher citations for articles with positive altmetric scores in all cases with sufficient evidence (Twitter, Facebook wall posts, research highlights, blogs, mainstream media and forums) except perhaps for Google+ posts. Evidence was insufficient for LinkedIn, Pinterest, question and answer sites, and Reddit, and no conclusions should be drawn about articles with zero altmetric scores or the strength of any correlation between altmetrics and citations. Nevertheless, comparisons between citations and metric values for articles published at different times, even within the same year, can remove or reverse this association and so publishers and scientometricians should consider the effect of time when using altmetrics to rank articles. Finally, the coverage of all the altmetrics except for Twitter seems to be low and so it is not clear if they are prevalent enough to be useful in practice.
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Scholarly and social impacts of scientific publications could be measured by various metrics, including article usage, Mendeley readership and Altmetric scores, etc. But what is the relationship amongst the different metrics? Previous studies show there is low correlation between altmetrics and citation, but how do altmetrics compare to other metrics? Xianwen Wang and his colleagues recently conducted a study to answer this question.
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Changes are occurring in scholarly communication as scientific discourse and research activities spread across various social media platforms. In this paper, we study altmetrics on the article and journal levels, investigating whether the online attention received by research articles is related to scholarly impact or may be due to other factors. We define a new metric, Journal Social Impact (JSI), based on eleven data sources: CiteULike, Mendeley, F1000, blogs, Twitter, Facebook, mainstream news outlets, Google Plus, Pinterest, Reddit, and sites running Stack Exchange (Q&A). We compare JSI against diverse citation-based metrics, and find that JSI significantly correlates with a number of them. These findings indicate that online attention of scholarly articles is related to traditional journal rankings and favors journals with a longer history of scholarly impact. We also find that journal-level altmetrics have strong significant correlations among themselves, compared with the weak correlations among article-level altmetrics. Another finding is that Mendeley and Twitter have the highest usage and coverage of scholarly activities. Among individual altmetrics, we find that the readership of academic social networks have the highest correlations with citation-based metrics. Our findings deepen the overall understanding of altmetrics and can assist in validating them.
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The nationally-recognized Susquehanna
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singing that will take you to new
heights!
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