105,307 research outputs found
Faust und Gretchen / H. Makart
No full textFAUST UND GRETCHEN / H. MAKART
Faust und Gretchen / H. Makart (1)
Faust und Gretchen (1
Particle identification with COMPASS RICH-1
No full textAbbon P, Alexeev M, Angerer H, et al. Particle identification with COMPASS RICH-1. Nucl.Instrum.Meth. A. 2011;631(1):26-39
Novel Brominated Carbosilane Precursors for Low-Temperature Heteroepitaxy of β-SiC and their Comparison with Methyltrichlorosilane
No full textKunstmann T, Angerer H, Knecht J, Veprek S, Mitzel NW, Schmidbaur H. Novel Brominated Carbosilane Precursors for Low-Temperature Heteroepitaxy of β-SiC and their Comparison with Methyltrichlorosilane. Chemistry of Materials. 1995;7(9):1675-1679.Novel organometallic precursors, 1,3-bis(monobromosilyl)propane, 1,2-bis(monobromosilyl)ethane, and methyltribromosilane, for low-temperature deposition of beta-SiC have been developed, and the kinetics and mechanism of their decomposition investigated. On the basis of the results, heteroepitaxial thin films of beta-SiC with very good structural quality have been deposited on (100) Si using methyltribromosilane and methyltrichlorosilane
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
Multiple PositivecisElements Regulate the Asymmetric Expression of theSpHEGene along the Sea Urchin Embryo Animal–Vegetal Axis
No full textAbstractThe mechanism that establishes the maternally determined animal–vegetal axis of sea urchin embryos is unknown. We have analyzed thecis-regulatory elements of theSpHEgene ofStrongylocentrotus purpuratus,which is asymmetrically expressed along this axis, in an effort to identify components of maternal positional information. Previously, we defined a regulatory region that is sufficient to provide correct nonvegetal expression of a β-galactosidase reporter gene (Wei, Z., Angerer, L. M., Gagnon, M. L., and Angerer, R. C.,Dev. Biol.171, 195–211, 1995). We have now analyzed this region intensively in order to determine if the spatial pattern is controlled by nonvegetal-positive activities or by vegetal-negative activities. The regulatory sequences, except the basal promoter, were mutated by either deletion or sequence replacement. None of these mutations resulted in ectopic β-gal expression in vegetal cells, showing that no single negativeciselement is responsible for the lack of vegetalSpHEtranscription. Surprisingly, even short segments of the regulatory region containing only several identifiedciselements also direct nonvegetal expression. Furthermore, theSpHEbasal promoter functions effectively in vegetal cells in combination withcis-acting elements derived from the PMC-specific gene,SM50.We conclude that the spatial pattern ofSpHEtranscription is achieved by multiple positive activities concentrated in nonvegetal cells. The vegetal expression ofSM50also is regulated only by positive activities (Makabe, K. W., Kirchhamer, C. V., Britten, R. J., and Davidson, E. H.,Development121, 1957–1970, 1995). A chimeric promoter containing bothSpHEandSM50regulatory sequences is active ubiquitously, suggesting that these regulators are not reciprocally repressive. These observations suggest a model in which theSpHEandSM50genes are activated by separate sets of positive maternal activities concentrated, respectively, in nonvegetal and vegetal domains of the early embryo
Die Literatur-Rundschau
No full textLiteratur-RundschauErhard Farndran (Hg.), Religion und Politik in einer säkularisierten Welt (H.-J. Große-Kracht)Hermann Sturm, Erwachsenenbildung und Rundfunk (S. Kampmann)Romy Fröhlich (Hg.), Der andere Blick (M.-L. Angerer) Franz-Josef Eilers (Hg.), Church and Social Communication (H. Rolfes
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
- …
