105,205 research outputs found
Basilius Valentinus. David Beuther. Jacobus Mosanus. Exzerpte und chemische Rezepte
No full textBASILIUS VALENTINUS. DAVID BEUTHER. JACOBUS MOSANUS. EXZERPTE UND CHEMISCHE REZEPTE
Basilius Valentinus. David Beuther. Jacobus Mosanus. Exzerpte und chemische Rezepte ( - )
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Basilius Valentinus: [Offenbarung seiner verborgenen Handgriffe], Auszüge, versetzt mit Teilen der [Handgriffe] (1)
[Chemische Rezepte und Auszüge von Briefabschriften] (12)
Ein wahrhaftiger Process wie man das Gold augmentirn sol (19)
Dulconis Clavaej Processus (23)
[Chemische Rezepte und Auszüge von Briefabschriften] (25)
Ein Particular auff die Luna (49)
[Chemische Rezepte und Auszüge von Briefabschriften] (50)
Johann Thölde ad illustrissimum principem [Mauritium] (71)
[Chemische Rezepte und Auszüge von Briefabschriften] (75)
Basilius Valentinus: Offenbarung (83)
David Beuther: [Probier-Kunst], Auszüge und Zusätze (105)
Ein Bericht eines Künstleins von einem Einbringen in den Antimonium (159)
[Chemische Rezepte und Auszüge von Briefabschriften] (164)
Federzeichnung (180)
Federzeichnung (190)
Federzeichnung (191)
Augmentum Joachimi Tankij (211)
[Chemische Rezepte und Auszüge von Briefabschriften] (213)
Wolfgang Lamprecht aus Arnstein: Discursus De antimonio ad lapidem, dt. (216)
Franz Trot[h]a: Augmentum perpetuum solis per mercurium animatum, dt. (219)
[Chemische Rezepte und Auszüge von Briefabschriften] (223)
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Looking for outflow and infall signatures in high-mass star-forming regions
No full textContext. Many physical parameters change with time in star-forming regions. Here we attempt to correlate changes in the infall and outflow motions in high-mass star-forming regions with evolutionary stage using JCMT observations.
Aims: From a sample of 45 high-mass star-forming regions in three phases of evolution, we investigate the presence of established infall and outflow tracers to determine whether there are any trends attributable to the age of the source.
Methods: We obtained JCMT observations of HCO+/H13CO+J = 4-3 to trace large-scale infall, and SiO J = 8-7 to trace recent outflow activity. We compared the infall and outflow detections to the evolutionary stage of the host source (high-mass protostellar objects, hypercompact HII regions, and ultracompact HII regions).
Results: We find a surprising lack of SiO detections in the middle stage (hypercompact HII regions), which may be an observational bias. When SiO is detected, we find that the integrated intensity of the line increases with evolutionary stage. The integrated intensity of SiO varies with the full width at half maximum of the H13CO+. All of the sources with infall signatures onto ultracompact HII regions have corresponding outflow signatures as well
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No full textAngular momentum evolution of young low-mass stars and brown dwarfs: observations and theory
No full textBook chapter published in Protostars & Planets VI (2014) eds. H. Beuther, R. Klessen, K. Dullemond, Th. Henning. University of Arizona Press, ISBN 978-0-8165-3124-0This chapter aims at providing the most complete review of both the emerging concepts and the latest observational results regarding the angular momentum evolution of young low-mass stars and brown dwarfs. In the time since Protostars & Planets V, there have been major developments in the availability of rotation period measurements at multiple ages and in different star-forming environments that are essential for testing theory. In parallel, substantial theoretical developments have been carried out in the last few years, including the physics of the star-disk interaction, numerical simulations of stellar winds, and the investigation of angular momentum transport processes in stellar interiors. This chapter reviews both the recent observational and theoretical advances that prompted the development of renewed angular momentum evolution models for cool stars and brown dwarfs. While the main observational trends of the rotational history of low mass objects seem to be accounted for by these new models, a number of critical open issues remain that are outlined in this review
UWISH2 - the UKIRT Widefield Infrared Survey for H2
No full textWe present the goals and preliminary results of an unbiased, near-infrared, narrow-band imaging survey of the first galactic quadrant (10° < l < 65°; ?1Graphic3 < b < +1Graphic3). This area includes most of the giant molecular clouds and massive star forming regions in the Northern hemisphere. The survey is centred on the 1–0 S(1) rovibrational line of H2, a proven tracer of hot, dense molecular gas in star-forming regions, around evolved stars, and in supernova remnants. The observations complement existing and upcoming photometric surveys (Spitzer-GLIMPSE, UKIDSS-GPS, JCMT-JPS, AKARI, Herschel Hi-GAL, etc.), though we probe a dynamically active component of star formation not covered by these broad-band surveys. Our narrow-band survey is currently more than 60 per cent complete. The median seeing in our images is 0.73 arcsec. The images have a 5? detection limit of point sources of K? 18 mag and the surface brightness limit is 10?19 W m?2 arcsec?2 when averaged over our typical seeing. Jets and outflows from both low- and high-mass young stellar objects are revealed, as are new planetary nebulae and – via a comparison with earlier K-band observations acquired as a part of the UKIDSS GPS – numerous variable stars. With their superior spatial resolution, the UWISH2 data also have the potential to reveal the true nature of many of the extended green objects found in the GLIMPSE survey
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe 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
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe 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
Dispelling the Myths Behind First-author Citation Counts
No full textWe 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 construction of Karen Karnak: The multi-author-function
No full textThis thesis is situated within the comparatively recent developments of Web 2.0 and the emergence of interactive WikiMedia, and explores the mode of authorship within a Read/Write culture compared to that of a Read/Only tradition. The hypothesis of this study is that the role of the audience has become merged with the author, and as such, represents new functions and attributes, distinct from a more conventional concept of authorship, in which the roles of audience and author are more separate. Read/Write and participatory culture, as defined by this study, is focused on collaboration, and includes the influences of D.I.Y. culture, Open-Source practices and the production of text by multiple authors. Multi-authorship presents a re-thinking of several concepts which support the notion of the individual author, since the focus of multi-authorship is not on attribution and ownership of a finished text, but on the continued malleability of a text. Modes of multi-authorship, demonstrated in the use of the pseudonyms Alan Smithee and Karen Eliot, represent declarative authors whose names signify multiple origins, whilst concurrently indicating a distinct body of work. The function of these names form an important context to this study, since primary research involves the construction of an experimental mode of multi-authorship utilising WikiMedia technology and the interaction of thirty nine participants, who are invited to create a body of work under the collective pseudonym Karen Karnak. The data generated by this experiment is analysed using aspects of Michel Foucault's author-function to identify and determine power structures inherent in the WikiMedia context. The interplay of power structures, including concepts such as identity, ownership and the body of work, affect the resulting mode of authorship and contribute to the construction of Karen Karnak, suggesting further areas of research into the emerging multi-author
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