1,354,072 research outputs found
Polarised photoelectrons from silver atoms
No full textHeinzmann U, Wolcke A, Kessler J. Polarised photoelectrons from silver atoms. Journal of Physics B: Atomic, Molecular and Optical Physics. 1980;13(16):3149-3156.The polarisation of photoelectrons ejected by circularly polarised VUV radiation from silver atoms has been measured in the wavelength range between 150 and 160 nm. Autoionisation states give rise to pronounced resonance structures in the photoionisation cross section and in the photoelectron polarisation. The measured polarisation yields direct information on the angular momentum quantum numbers J of the autoionising states and on extrema of the cross section resonances
Spin polarized photoelectrons from unpolarized lead atoms exposed to unpolarized radiation
No full textHeinzmann U, Schönhense G, Wolcke A. Spin polarized photoelectrons from unpolarized lead atoms exposed to unpolarized radiation. In: Kleinpoppen H, Williams JF, eds. Proceedings Intern. Workshop on "Coherence and Correlation in Atomic Collisions". New York: Plenum Press; 1980: 607
Measurements of Fano-effect at Xenon atoms using circularly polarized synchrotron radiation
No full textHeinzmann U, Schäfers F, Thimm K, Wolcke A, Kessler J. Measurements of Fano-effect at Xenon atoms using circularly polarized synchrotron radiation. Europ. Synchr. Radiat. News. 1979:3
Polarised photoelectrons produced at xenon atoms by circularly polarised synchrotron radiation
No full textHeinzmann U, Schäfers F, Thimm K, Wolcke A, Kessler J. Polarised photoelectrons produced at xenon atoms by circularly polarised synchrotron radiation. Journal of Physics B: Atomic, Molecular and Optical Physics. 1979;12(22):L679-L683.Circularly polarised synchrotron radiation is used for producing spin polarised photoelectrons at xenon atoms. After a brief description of the apparatus the dependence of the electron polarisation on the photo energy is presented and compared with a theoretical prediction
CAESARES MONARCHIAE ROMANAE, ORBIS DOMINAE, LATI, BYZANTI, GRAECI, GERMANI, QVATVORDECIM TESSARADECADIBVS DISTINcti, et Metro elegiaco iuxta fidem historicam conscripti. Addita sunt eorundem Symbola, breuibus & rotundis versiculis comprehensa, A MATTHIA BORBONIO COLLIN.
No full textBerichtigte Aufnahme.Beiträger: Consmann, Friedrich; Arconatus, Hieronymus; Capella, Peter aus Elbing; Ruchard, Johannes; Sokołowski, MarcinVorlageform des Erscheinungsvermerks: LIPSIAE || ANNO M.D.XCV. || Impensis ANDREAE VVOLCKII || Bibliopolae Vratislauiensis.||(IMPRIMEBAT MICHAEL || LANTZENBERGER.||)Ill. (Holzschn.), Druckerm
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
Spin-resolved core and valence electron photoemission from non-epitaxially grown Pb layers on Pt(111)
No full textVogt B, Schmiedeskamp B, Heinzmann U. Spin-resolved core and valence electron photoemission from non-epitaxially grown Pb layers on Pt(111). Vacuum. 1990;41(4-6):1118-1120.The core and valence levels of Pb adsorbates on Pt(111) have been studied by means of spin, angle and energy-resolved photoemission with circularly polarized synchrotron radiation of BESSY. For an eight layer Stranski-Krastanov grown Pb adsorbate (which is thus non-epitaxial) the d core level peaks show a spin-orbit splitting of 2.7 eV and no shift with photon energy. Spin-resolved photoemission for normal light incidence and normal electron emisson from the 5d5/2 level reveals a mj splitting in addition to the spin-orbit splitting and in addition to the core level shifts known. The valence levels were studied with photon energies of about 12 eV. Two peaks corresponding to the 6p3/2 and 6p1/2-derived levels could be detected for the highly symmetrical setup of normal light incidence and normal electron emission. Off normal electron emission from the 6p3/2-derived level yields the opposite sign polarization component parallel to the photon spin when compared to the normal electron emission results. This is in agreement with earlier photoionization studies of free Pb atoms
Variations on the Author
No full text“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
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
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