1,723,843 research outputs found
A design and optimization assistant for induction motors and generators
Get PDFThesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1998.Includes bibliographical references (p. [173]-181).by Ujjwal Sinha.Ph.D
Delayed choice of paths in the quantum paradox of separating different properties of a photon
No full textThe so-called quantum Cheshire Cat is a scenario where a photon, identified with a cat, and a component of its polarization, identified with the grin of that cat, are separated. We observe that the same techniques can be used to separate two orthogonal components of polarization of a photon, on an average. We identify these polarization components of the photon as the grin and snarl of the cat for ease of comprehension. A gedanken experiment is presented in which we simultaneously tune the input polarizations of the photon in the two arms of a Mach-Zehnder interferometer. It is noted that for two particular choices of photon polarization, the presence of the two components gets reversed in the two arms. This reversal of the grin and the snarl occurs before the polarization components even interact with the tuners, i.e., before the choice of which arm each should be in is made
Book Review: Towards Legal Literacy: An Introduction to Law in India. Edited by Kamala Sankaran & Ujjwal Kumar Singh
No full text Towards Legal Literacy: An Introduction to Law in India. Edited by Kamala Sankaran & Ujjwal Kumar Singh, Oxford University Press, New Delhi, India, 2008, Pp. 212, ₹495, ISBN 0195692225, ISBN 9780195692228 </jats:p
The management of spondylolysis and spondylolisthesis
No full textAbstract not availableBrian J. C. Freeman and Ujjwal K. Debnat
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
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
Photoinduced Fabrication of Cu/TiO2 Core-Shell Heterostructures Derived from Cu-MOF for Solar Hydrogen Generation: The Size of the Cu Nanoparticle Matters
No full textThe inclusion of metal cocatalysts into the semiconductor photocatalysts is the most proficient way to separate the photoexcited charge carriers by providing additional reaction sites and is a typical way to enhance the efficiency of catalytic reactions. We report a new strategy for the synthesis of Cu/TiO2 core shell photocatalyst supported on the amorphous TiO2 matrix based on the Cu-metal organic framework (MOF) self-templating approach and employed in photocatalytic hydrogen production from water. The [Cu(tpa)(dmf)] MOF hollow nanocrystal encapsulated by amorphous-phase TiO2 is treated under controlled light with simple altered reaction conditions to produce the core shell Cu/TiO2 hybrid nanoplatform. It resulted in spherical Cu nanoparticles (NPs) with the different sizes and (111) exposed facets. The localized field-mediated charge transfer properties and capacitive behavior at the anodic panel of the as-prepared photocatalysts suggest a low Schottky barrier at the homogeneous interfacial contacts between smaller Cu NP and the TiO2 and promotes the fast photoexcited charge separation during water splitting. Benefiting from the structural and compositional features, the 2 nm Cu/TiO2 photocatalyst manifests the hydrogen production rate of 334 mu mol g(-1) h(-1), without employing the noble metal cocatalyst under 1.5 AM simulated light irradiation. The activity was further reinforced by the photolysis of alkaline water on the anode surface, which generated a steady-state geometric current density of 8 mA cm(-2) at 1.23 V (vs reversible hydrogen electrode) with almost 50% incident photon-to-current conversion efficiency.
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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