122,911 research outputs found
Neoproterozoic-cambrian tectonics, global change and evolution: a focus on Southwestern Gondwana
No full textEdited by Claudio Gaucher, Alcides N. Sial, Galen P. Halverson and Hartwig E. Frimme
Dualities of deformed N = 2 SCFTs from link monodromy on D3-brane states
No full textAbstract We study D3-brane theories that are dually described as deformations of two different N = 2 superconformal theories with massless monopoles and dyons. These arise at the self-intersection of a seven-brane in F-theory, which cuts out a link on a small three-sphere surrounding the self-intersection. The spectrum is studied by taking small loops in the three-sphere, yielding a link-induced monodromy action on string junction D3-brane states, and subsequently quotienting by the monodromy. This reduces the differing flavor algebras of the N = 2 theories to the same flavor algebra, as required by duality, and projects out charged states, yielding an N = 1 superconformal theory on the D3-brane. In one, a deformation of a rank one Argyres-Douglas theory retains its SU(2) flavor symmetry and exhibits a charge neutral flavor triplet that is comprised of electron, dyon, and monopole string junctions. From duality we argue that the monodromy projection should also be imposed away from the conformal point, in which case the D3-brane field theory appears to exhibit confinement of electrons, dyons, and monopoles. We will address the mathematical counterparts in a companion paper
Toward a Neoproterozoic composite carbon-isotope record
No full textGalen P. Halverson, Paul F. Hoffman, Daniel P. Schrag, Adam C. Maloof, and A. Hugh N. Ric
Studies on the cyclic AMP response to thyroid stimulating immunoglobulin (TSI) and thyrotropin (TSH) in human thyroid cell monolayers
No full textStudies were conducted on the cultured human thyroid cell bioassay for thyroid stimulating immunoglobulin (TSI) and thyrotropin (TSH). In confirmation of the data of Kasagi, et al.,15 incubation of human thyroid cells in Hank's balanced salt solution deficient in NaCl increased the sensitivity of the c-AMP response to bovine TSH by approximately one order of magnitude. Half-maximal stimulation was attained at approximately 0.1 mU bTSH/ml. The effect of NaCl in the medium was greatest with stimulation by TSI > hTSH > bTSH. In contrast to incubations in NaCl(+) medium, with NaCl(-) medium most (70%-80%) of the c-AMP produced was released into the medium; this proportion remaining relatively constant over a wide range of bTSH and hTSH concentrations. At TSI concentrations higher than 3mg/ml efflux of c-AMP into the medium was significantly diminished. Stimulation by cholera toxin and prostaglandin E of thyroid cell c-AMP generation was not enhanced in NaCl(-) medium, in contrast to stimulation by TSH and TSI. The presence of 10-4M cycloheximide in NaCl(+) medium enhanced the c-AMP response to physiological concentrations of TSH. As with NaCl(-) medium, cycloheximide increased the sensitivity but not the maximum response of the c-AMP response to TSH. However no additivity was observed with NaCl(-) medium and cycloheximide. Human thyroid cells obtained from patients with Graves' disease are relatively insensitive to TSI stimulation. In NaCl(-) medium, however, the sensitivity of these cells to TSI stimulation is sufficient to enable them to be utilized in the TSI assay. The present state of the TSI assay is discussed. © 1982
A Multi-Language Comparison of Influences on Author Verification using Character N-Grams
No full textWe create a new multi-language corpus for author verification based on Wikipedia talkpages, and evaluate the influence that differences in topic and time have on character n-gram author profiles. Topic alignment between two texts is found to increase author verification precision, and an authors writing style is found to change over time, but not more significantly after 3 years than after 1 year.Information ArchitectureWISElectrical Engineering, Mathematics and Computer Scienc
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe 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
Asymptotic behavior of the solutions to a family of PDE's arising from the chemotaxis equations of Keller and Segal
No full textThe system ut = uxx - (uvx)x, vt = u - Av is considered where A is a non-negative, self-adjoint operator which commutes with the Laplacian. The operator is considered to have eigenvalues lambda n = nrholambda1, and the system is considered on [0,1] x [0,T] with homogeneous Neumann boundary conditions. The operators which lead to global solutions and those that lead to solutions which blow up in finite time are considered as a function of rho, using an application of the methods of Hillen and Potapov [Math. Methods Appl. Sci., 27 (2004), pp. 1783-1801] to analyze the global case and those of Halverson, Levine, and Renclawowicz [Siam J. Appl. Math., 65 (2004), pp. 336--360; 66 (2005), pp. 361--364] to analyze the finite time blowup case. Some numerical results are provided to back up the analysis. Some questions and directions for future study are posed.</p
The vanishing author in computer-generated works: a critical analysis of recent Australian case law
No full textAbstract
The use of software is ubiquitous in the creation of many copyright works, yet the requirement in copyright law that every work have a human author who engages in independent intellectual effort means that its use may prevent copyright subsistence. Several recent Australian cases have refocused attention on authorship as an essential criterion of copyright subsistence, and these cases suggest that much computer-produced output may be authorless and thus lack copyright protection. This article, the first in a two-part series, analyses how each case deals with the question of authorship of computer-produced works and why the use of software diminishes copyright protection for a significant number of computer-generated works. The article critiques the application of conventional notions of human authorship developed in the pre-computer age to modern productions and suggests alternative approaches to authorship that satisfy both the major objectives of copyright policy and the need to adapt to the computer age. The article argues that, without a broader judicial approach to authorship of computer-generated works, Parliament must remedy the lacuna in protection for these ‘authorless’ works. Possible solutions for reform are suggested. In a forthcoming article, the author comprehensively examines those reform proposals
Diffusive author(s), cohesive author: Analysis of S/N (1994)
No full textThis study indicates the ways in which various aspects of the author(s) are brought forth in Dumb type’s performance art, the S/N production. Previous research has suggested a non-hierarchical organization of Dumb type and the absence of a “privileged author” in Dumb type’s collaborative work, S/N. However, the results that I have investigated from member’s interviews on the creative process of S/N along with my analysis of the recorded images of S/N, indicate a different aspect of the author(s). First, S/N was created through, so to speak, the collective ideas of the members of Dumb type. Further, S/N has at least nine quotations from previous performances, installations, and printed writings, besides the work-in-progress technique. Explicating one of the “author functions” as given by Michel Foucault, each text has plural subjects of the author. However, it has been revealed from members’ interviews that Teiji Furuhashi had a decision-making role in selecting the members’ ideas within the performance. Since then, S/N has had plural subjects of creation; however, Furuhashi is one of the subjects of creation along with the “privileged author.” S/N has plural authors (diffusive authors) yet at the same time, it has a “privileged author,” Teiji Furuhashi (cohesive author)
Evidence of late Neoproterozoic glaciation in the Caledonides of NW Scandinavia
No full textF. Stodt, A.H.N. Rice, L. Björklund, G. Bax, G.P. Halverson and T.C. Pharao
- …
