1,721,012 research outputs found
Studying complex metal-molecule interface with low temperature scanning tunneling microscope : from electronic structure to charge transport
No full textA fundamental understanding of complex metal-organic interfaces is widely considered to be a milestone on the way to successful realization of molecular-based electronic devices. In the context of interface studies, local tunneling methods, based on the ability of the scanning tunneling microscope (STM) to resolve surface structure as well as surface electronic and vibrational properties with atomic scale resolution, are considered to be very helpful. However, the potential of such methods as applied to cases of complex organic adsorption have not yet been exhaustively tested. In this thesis, a well-studied model case of complex organic adsorption was selected in order to apply a number of local STM methods aiming at a detailed characterization of the interface structural, electronic, vibrational and transport properties on the scale of a single metal-molecule contact. The main objective is twofold: On the one hand a fundamental analysis of the complex metal-organic interfaces is performed, especially the relation between their electronic structure and charge transport properties. On the other hand, we aim a detailed test of various STM-based techniques applied to the realistic problem of complex adsorption and transport measurements. Given that the chosen interface system is the best studied case of complex organic adsorption showing the highest degree of order and at the same time demonstrating very rich phenomenology one may expect that the results obtained on such a system will clearly demonstrate the potential and limitations of the experimental techniques applied
Imaging and control of large organic molecules within a scanning probe microscopy junction
No full textGoing Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe 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
Quantitative Mapping of Nanoscale Electrostatic Potentials Using a Scanning Pprobe Microscope Tip Equipped with a Single-Molecule Quantum Dot Sensor
No full text
How much control over single molecules could one get with the junction of a scanning probe microscope?
No full textVariations on the Author
Get PDF“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
Get PDFWe 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
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