20,865 research outputs found
The Formal Underpinnings of the Response Functions used in X-Ray Spectral Analysis
This work provides an in-depth mathematical description of the response
functions that are used for spatial and spectral analysis of X-ray data. The
use of such functions is well-known to anyone familiar with the analysis of
X-ray data where they may be identified with the quantities contained in the
Ancillary Response File (ARF), the Redistribution Matrix File (RMF), and the
Exposure Map. Starting from first-principles, explicit mathematical expressions
for these functions, for both imaging and dispersive modes, are arrived at in
terms of the underlying instrumental characteristics of the telescope including
the effects of pointing motion. The response functions are presented in the
context of integral equations relating the expected detector count rate to the
source spectrum incident upon the telescope. Their application to the analysis
of several source distributions is considered. These include multiple, possibly
overlapping, and spectrally distinct point sources, as well as extended
sources. Assumptions and limitations behind the usage of these functions, as
well as their practical computation are addressed.Comment: 22 pages, 3 figures (LaTeX
Guide to fisheries policy research in Cambodia : the institutional and legal context
Fishery policy, Fishery management, Legal aspects, Cambodia,
Blue frontiers: managing the environmental costs of aquaculture
The report begins with an overview of the current status of world aquaculture. It then goes on to describe an approach for estimating the current combined biophysical resource demands of aquaculture for producer countries and regions. Following a comparison of these results with those available for other animal food production sectors the report then examines the consequences of likely future trends in production on the environmental impacts of aquaculture. Finally, the policy implications of the reportÆs findings are discussed along with the research agenda that should be pursued to meet the challenge of sustainable food production.Aquaculture, Aquaculture systems, Life cycle analysis, Environmental impact, Resource management, Aquaculture statistics, Sustainability
Study of excited nucleon states at EBAC: status and plans
We present an overview of a research program for the excited nucleon states
in Excited Baryon Analysis Center (EBAC) at Jefferson Lab. Current status of
our analysis of the meson production reactions based on the unitary dynamical
coupled-channels model is summarized, and the N* pole positions extracted from
the constructed scattering amplitudes are presented. Our plans for future
developments are also discussed.Comment: Plenary talk given at Workshop on the Physics of Excited Nucleon --
NSTAR2009, Beijing, April 19-22, 2009. 8 pages, 8 figure
Identifying Opportunities for Integrated Service Delivery to Children, Youth, and Young Adults with Disabilities
Interim Report on Act 153: An Act Relating to Voluntary School District Merger, Virtual Merger, Supervisory Union Duties, and Including Secondary Students with Disabilities in Senior Year Activities and Ceremonies
Final Report of the Commission on Presidential Disability and the Twenty-Fifth Amendment
This Report examines the Twenty-Fifth Amendment to identify potential difficulties in presidential succession and makes recommendations
Humphrey Center News: Spring/Summer 1986 v. 2, no. 2
Newsletter of the Hubert H. Humphrey Cancer Research Center at Boston University School of Medicine
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