1,720,968 research outputs found
One-dimensional chain structure produced by Ce on vicinal Si(100)
No full textOne-dimensional Ce nanowires have been grown on a single-domain vicinal Si(100) surface. The growth mode, including the structural and electronic properties as a function of the substrate temperature and Cc coverage, was studied using scanning tunneling microscopy and scanning tunneling spectroscopy. The results show the formation of Cc nanowires along the step edges on the vicinal Si(100) substrate at 580 degrees C. (c) 2006 Elsevier B.V. All rights reserved.the KOSEF through the Center for Nanotubes and Nanostructured Composites, the Brain Korea 21 Project, the Advanced Backbone IT Technology Development Project of the Ministry of Information and Communication, the National R&D Project for Nanoscience and Nanotechnology.
The authors acknowledge the partial financial supports
provided by the Korea Science and Engineering
Foundation and the Ministry of Science and Technology
through the Frontier Research project
Selectively assembled Co nanoparticle stripes prepared by covalent linkage and microcontact printing
No full textWe introduce a novel strategy to fabricate a bifunctional monolayer assembly of Co nanoparticles on a Si-(111) surface via the covalent linkage of terminal functional groups between the Si surface and the nanoparticles. The Br-terminated Co nanoparticles that are assembled on the aminopropyl-terminated Si surface show an individual and random distribution over an entire surface. Furthermore, we have fabricated a selective patterned monolayer assembly of Co nanoparticles using a combination of microcontact printing and covalent linkage: the Br-terminated Co nanoparticles attached on only aminopropyl-terminated regions but not on the octadecyl-terminated regions that consist of nonfunctional alkyl groups.KOSEF through the Center for Nanotubes and Nanostructured Composites, the Brain Korea 21 Project, the Advanced Backbone IT Technology Development Project, the National
R&D Project for Nano Science and Technology
Going 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
Bond character of thiophene on Ge(100): Effects of coverage and temperature
No full textWe have studied the adsorption and decomposition of thiophene (C4H4S) on Ge(100) using scanning tunneling microscopy (STM), high-resolution core-level photoemission spectroscopy (HRPES), and density functional theory (DFT) calculation. Analysis of S 2p core-level spectra reveals three adsorption geometries, which we assign to a Ge-S dative bonding state, a [4 + 2] cycloaddition bonding state, and a decomposed bonding state (desulfurization reaction product). Furthermore, we found that the number ratio of the three adsorption geometries depended on the molecular coverage and the annealing temperature. At low coverages, the kinetically favorable dative bonding state is initially formed at room temperature. As the molecular coverage increases, thermodynamically stable [4 + 2] cycloaddition reaction products are additionally produced. In addition, we found that as the surface temperature increased, the [4 + 2] cycloaddition reaction product either possibly desorbed as molecular thiophene or decomposed to form a metallocycle-like species (C4H4Ge2) and a sulfide (Ge2S). We systematically elucidate the changes in the bonding states of adsorbed thiophene on Ge(100) according to the thiophene coverage and annealing temperature.the Brain Korea 21 project, the SRC programs (Center for Nanotubes and Nanostructured Composites and the Center for Strongly Correlated Material Research) of MOST/KOSEF, and the National R & D Project for Nano Science and Technology. Grant No. KRF-2005-070-C00063 from the Korea Research Foundation, and Grant No. R01-2006-000-11247-0 from the the Basic Research Program of KOSEF(Dr. Lee)
Self-induced 1-D molecular chain growth of thiophene on Ge(100)
No full textthe Brain Korea 21 project, the SRC program (Center for Nanotubes and Nanostructured
Composites) of MOST/KOSEF, the National R & D
Project for Nano Science and Technology, Korea Research Foundation Grant No. KRF-2005-070-C00063, and the Basic Research Program of KOSEF Grant No. R01-2006-000-11247-0
Monolayer assembly and striped architecture of Co nanoparticles on organic functionalized Si surfaces
No full textWe present a new strategy to fabricate a monolayer assembly of Br-terminated Co nanoparticles on functionalized Si surfaces by using chemical covalent bonding and microcontact printing method. Self-assembled monolayers (SAMs) of the Co nanoparticles formed on the hydroxyl-terminated Si surface exhibit two-dimensional island networks with locally ordered arrays via covalent linkage between nanoparticles and surface. On the other hand, SAMs of the nanoparticles on the aminopropyl-terminated Si surface show an individual and random distribution over an entire surface. Furthermore, we have fabricated striped architectures of Co nanoparticles using a combination of microcontact printing and covalent linkage. Microcontact printing of octadecyltrichlorosilane and selective covalent linkage between nanoparticles and functionalized Si surfaces lead to a hybrid nanostructure with selectively assembled nanoparticles stripes on the patterned functionalized Si surfaces.KOSEF through the Center for Nanotubes and
Nanostructured Composites, the Brain Korea 21 Project, the Advanced Backbone IT Technology Development Project, the National R&D Project for Nano Science and Technolog
Variations 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
Dispelling the Myths Behind First-author Citation Counts
Get PDFWe 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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