1,720,996 research outputs found
On the cubic Dirac equation with potential and the Lochak--Majorana condition
No full textWe study a cubic Dirac equation on
\begin{equation*}
i \partial _t u + \D u + V(x) u =
\langle \beta u,u \rangle \beta u
\end{equation*}
perturbed by a large potential with almost critical regularity. We prove global existence and scattering for small initial data in with additional angular regularity. The main tool is an endpoint Strichartz estimate for the perturbed Dirac flow. In particular, the result covers the case of spherically symmetric data with small norm.
When the potential has a suitable structure, we prove global existence and scattering for \emph{large} initial data having a small chiral component, related to the Lochak--Majorana condition
Blowup and ill-posedness results for a dirac equation without gauge invariance
No full textWe consider the Cauchy problem for
a nonlinear Dirac equation on , ,
with a power type, \emph{non} gauge invariant nonlinearity .
We prove several ill-posedness and blowup results for
both large and small data. In particular we prove that:
for (essentially arbitrary) large data in
the solution blows up in a
finite time;
for suitable large data and
no weak solution exist;
when
(or in ), there exist arbitrarily small
initial data data for which the solution blows up in a finite time
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
2010300093
No full textPCT Number: PCT/AU2010/001256
WIPO Number: WO2011/035386Inventors: Tester, Mark Alfred; Kaiser, Brent; Carter, Scott Anthony William; Shearer, Monique; Plett, Darren Craig; Roy, Stuart John; Cotsaftis, Olivier; Tyerman, Stephan; Okamoto, Mamoru. Assignee: Australian Centre for Plant Functional Genomics Pty Ltd. Agents: Phillips Ormonde Fitzpatric
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
On the -measure (Nonlinear and Random Waves)
Get PDFThis is a résumé of the construction part of the -measure of the paper “Stochastic quantization of the -model” by Oh, Tolomeo, and the author. In this note, we give an outline of the proof of the normalizability of the -measure in the weakly nonlinear regime
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
Interference with the citrulline-based nitric oxide synthase assay by argininosuccinate lyase activity in Arabidopsis extracts
No full textThere are many reports of an arginine-dependent nitric oxide synthase activity in plants; however, the gene(s) or protein(s) responsible for this activity have yet to be convincingly identified. To measure nitric oxide synthase activity, many studies have relied on a citrulline-based assay that measures the formation of L-citrulline from L-arginine using ion exchange chromatography. In this article, we report that when such assays are used with protein extracts from Arabidopsis, an arginine-dependent activity was observed, but it produced a product other than citrulline. TLC analysis identified the product as argininosuccinate. The reaction was stimulated by fumarate (> 500 microM), implicating the urea cycle enzyme argininosuccinate lyase (EC 4.3.2.1), which reversibly converts arginine and fumarate to argininosuccinate. These results indicate that caution is needed when using standard citrulline-based assays to measure nitric oxide synthase activity in plant extracts, and highlight the importance of verifying the identity of the product as citrulline.Rudolf Tischner, Mary Galli, Yair M. Heimer, Sarah Bielefeld, Mamoru Okamoto, Alyson Mack and Nigel M. Crawfor
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