1,721,419 research outputs found
Spherical pinch x-ray generator prototype for microlithography
No full textA new type of plasma x-ray source has been developed by applying the spherical pinch concept of imploding shock waves to produce a dense plasma hot enough to emit soft x-rays. Very intense x-rays in a few keV energy (5-10 angstroms) is radiated from a small plasma volume as microsecond pulses. SPX II is a prototype machine designed to demonstrate the engineering feasibility of the spherical pinch scheme. It is expected to generate at least 10 mJ/cm2 of usable soft x-rays for microlithography
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe 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
Almost formality of manifolds of low dimension
Full text linkIn this paper we introduce the notion of Poincaré DGCAs of Hodge
type, which is a subclass of Poincaré DGCAs encompassing the de Rham algebras of closed orientable manifolds. Then we introduce the notion of the small algebra and the small quotient algebra of a Poincaré DGCA of Hodge
type. Using these concepts, we investigate the equivalence class of (r-1)-connected (r > 1) Poincaré DGCAs of Hodge type. In particular, we show that an (r-1)-connected Poincar ́e DGCA of Hodge type A* of dimension n <=
5r - 3 is A-infinity-quasi-isomorphic to an A_3-algebra and prove that the only obstruction to the formality of A* is a distinguished Harrison cohomology class [μ3] in Harr^3-1(H*(A*), H*(A*)). Moreover, the cohomology class [μ3] and
the DGCA isomorphism class of H*(A*) determine the A-infinity-quasi-isomorphism
class of A*. This can be seen as a Harrison cohomology version of the Crowley-
Nordstrom results on rational homotopy type of (r - 1)-connected (r > 1)
closed manifolds of dimension up to 5r -3. We also derive the almost formality of
closed G2 -manifolds, which have been discovered recently by Chan-Karigiannis-
Tsang, from our results and the Cheeger-Gromoll splitting theorem
Variations on the Author
Full text link“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
Full text linkWe 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
Numerical parameters for 3-D Models presented by Suzuki,Y., Kawai, K., Geller, R.J.(2021, PEPI)
No full textNumerical parameters for 3-D Models presented by Borgeaud, A.F.E., Kawai, K. & Geller, R.J.
No full textNumerical parameters for the potential energy presented by Okuda, H.,Kawai, K., & Sakuma, H.
No full textNumerical parameters for the potential energy presented by Okuda, H.,Kawai, K., & Sakuma, H.
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