2,564 research outputs found
Next-to-next-to-leading order results for heavy quark pair production in quark--antiquark collisions: The one-loop squared contributions
We calculate the next-to-next-to-leading order
one-loop squared corrections to the production of heavy quark pairs in
quark-antiquark annihilations. These are part of the next-to-next-to-leading
order radiative QCD corrections to this process. Our
results, with the full mass dependence retained, are presented in a closed and
very compact form, in the dimensional regularization scheme. We have found very
intriguing factorization properties for the finite part of the amplitudes.Comment: 12 pages, 2 figures, electronic results file, abbreviation NNLO in
Title and Abstract expanded, Summary expanded, reference updated, version to
appear in Phys.Rev.
A Feature-Augmented Grammar for Automated Media Production
The IST Polymnia project is creating a fully automated system for personalised video generation, including content creation, selection and composition. This paper presents a linguistically motivated solution using context-free feature-augmented grammar rules to describe editing tasks and hence automate video editing. The solution is media and application independent
A high resolution solar atlas for fluorescence calculations
The characteristics required of a solar atlas to be used for studying the fluorescence process in comets are examined. Several sources of low resolution data were combined to provide an absolutely calibrated spectrum from 2250 A to 7000A. Three different sources of high resolution data were also used to cover this same spectral range. The low resolution data were then used to put each high resolution spectrum on an absolute scale. The three high resolution spectra were then combined in their overlap regions to produce a single, absolutely calibrated high resolution spectrum over the entire spectral range
One-loop amplitudes for four-point functions with two external massive quarks and two external massless partons up to O(epsilon^2)
We present complete analytical results on the
one-loop amplitudes relevant for the NNLO quark-parton model description of the
hadroproduction of heavy quarks as given by the so-called loop-by-loop
contributions. All results of the perturbative calculation are given in the
dimensional regularization scheme. These one-loop amplitudes can also be used
as input in the determination of the corresponding NNLO cross sections for
heavy flavor photoproduction, and in photon-photon reactions.Comment: 25 pages, 6 figures in the text, Revtex, one reference added, minor
improvements in the text, to appear in Phys.Rev.
Pre-hospital pain management patterns and triage nurse documentation
Introduction: Little is known about the public's preferences for pain management prior to attending an Emergency Department (ED). Therefore, the aim of the study was to explore (i) triage documentation of pre-hospital analgesic patterns for patients presenting in pain; (ii) patient documented explanations for not self administering an analgesic in the pre-hospital setting; (iii) triage nurse documentation of pain descriptors and or pain scores; and (iv) the disposition of ED patients presenting in pain. Method: A 2-week retrospective exploratory review was conducted. Results: There were 2142 ED presentations during the 2-week study and 52% of patients had documented evidence of arriving with a painful condition. Of the 1113 patients 60% were documented to be in pain on arrival. Of the group documented to have arrived in pain only 28% self-administered or received an analgesic in the pre-hospital/community setting. Patients provided a variety of reasons for not self-administering a pre-hospital analgesic. Conclusion: Unnecessary suffering may be avoided if the public had a better understanding of pain and the benefits of pain management. Further research is required to better understand the beliefs and attitudes towards pain and pain management by clinicians and the public. © 2011 Elsevier Ltd
For Joan:Some letters with reverence, an honorary degree, and a dialogical tribute
In 2012, I coâtaught, with AnneâCharlott Callerstig, a master's course module at Linköping University in Swedenentitled âIntersectional Gender, and Institutional and Organizational Workâ. Towards the end of the course I was emailed by Donald Van Houten asking for contributions to a text to be presented at a reception on International Women's Day, 8 March 2012, at the University of Oregon, honouring Joan Acker and her remarkable career. The reception was part of the Lorwin Lecture Series on âCivil Rights and Civil Libertiesâ and the Wayne Morse Center symposium on âGender Equity and Capitalismâ. To honour Joan and her legacy, I was asked to send a personal statement testifying to Joan's impact on her life and work, to be collected together in a small book. We were using some of Joan's writing as key texts on the module, so it seemed appropriate to do something collectively, and accordingly I asked the students to write short âlettersâ to Joan. I sent off our letters, which we called âSome Letters Written with Reverenceâ; I trust Joan received them and liked them. Therefore, here in this writing for Joan there are three parts. In the first, the âlettersâ are reproduced; the next is the edited proposal I wrote for Joan to be awarded an honorary doctorate at Hanken School of Economics, the Swedishâlanguage business school in Helsinki, Finland; she received the honour in 2011; and for the last part, I add an additional personal tribute and reflection from the vantage point of now, today
15 years of comet photometry: A comparative analysis of 80 comets
In 1976 we began a program of narrowband photometry of comets that has encompassed well over 400 nights of observations. To date, the program has provided detailed information on 80 comets, 11 of which have been observed on multiple apparitions. In this paper we present the observed range of compositions (molecular production rate ratios) and dustiness (gas production compared with AF-rho) for a well sampled group of comets. Based on these results we present preliminary analysis of taxonomic groupings as well as the abundance ratios we associate with a 'typical' comet
Confidentiality and public protection: ethical dilemmas in qualitative research with adult male sex offenders
This paper considers the ethical tensions present when engaging in in-depth interviews with convicted sex offenders. Many of the issues described below are similar to those found in other sensitive areas of research. However, confidentiality and public protection are matters that require detailed consideration when the desire to know more about men who have committed serious and harmful offences is set against the possibility of a researcher not disclosing previously unknown sensitive information that relates to the risk of someone being harmed.</p
The upper triangular solutions to the three-state constant quantum Yang-Baxter equation
In this article we present all nonsingular upper triangular solutions to the
constant quantum Yang-Baxter equation
in the three state
case, i.e. all indices ranging from 1 to 3. The upper triangular ansatz implies
729 equations for 45 variables. Fortunately many of the equations turned out to
be simple allowing us to start breaking the problem into smaller ones. In the
end we had a total of 552 solutions, but many of them were either inherited
from two-state solutions or subcases of others. The final list contains 35
nontrivial solutions, most of them new.Comment: 24 Pages in LaTe
Jekyll and Hyde: men's constructions of feminism and feminists
Research and commentary on men's responses to feminism has demonstrated the range of ways in which men have mobilised both against and for feminist principles. This paper argues that further analyses of men's responses require a sophisticated theory of discourse acknowledging the fragmented and contradictory nature of representation. A corpus of men's talk on feminism and feminists was studied to identify the pervasive patterns in men's accounting and regularities in rhetorical organisation. Material from two samples of men was included: a sample of white middle-class 17-18 year old school students and a sample of 60 interviews with a more diverse sample of older men aged 20 to 64. Two interpretative repertoires of feminism and feminists were identified. These set up a 'Jekyll and Hyde' binary and positioned feminism along with feminists very differently as reasonable versus extreme and monstrous. Both repertoires tended to be deployed together and the paper explores the ideological and interactional consequences of typical deployments along with the identity work accomplished by the men as they positioned themselves in relation to these
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