42,028 research outputs found
MS-096: John W. Miner Letters
This collections includes the letters of John W. Miner to his wife Anna throughout his service in the Civil War with the 7th New Jersey Volunteer Infantry at Petersburg, Virginia and his service in the 4th US Cavalry at Fort Griffin, Texas. Miner’s letters are most valuable when used as a tool to study the perceptions of the Civil War soldier regarding battles and national events.https://cupola.gettysburg.edu/findingaidsall/1088/thumbnail.jp
Lost Lives: Miscarriages of Justice in Capital Cases
Gross discusses the incidence of erroneous convictions for capital murder, which are systematic consequences of the natuere of homicide prosection in general and capital prosecution in particular
The deuteron: a mini-review
We review some recent results for elastic electron deuteron scattering
(deuteron form factors) and photodisintegration of the deuteron, with emphasis
on the recent high energy data from Jefferson Laboratory (JLab).Comment: 14 pages, 11 figures, Invited talk given to the Conference on Mesons
& Light Nuclei, held in Prague, Czech Republic, July 2- 6, 200
Quivers, curves, and the tropical vertex
Elements of the tropical vertex group are formal families of
symplectomorphisms of the 2-dimensional algebraic torus. Commutators in the
group are related to Euler characteristics of the moduli spaces of quiver
representations and the Gromov-Witten theory of toric surfaces. After a short
survey of the subject (based on lectures of Pandharipande at the 2009 Geometry
summer school in Lisbon), we prove new results about the rays and symmetries of
scattering diagrams of commutators (including previous conjectures by
Gross-Siebert and Kontsevich). Where possible, we present both the quiver and
Gromov-Witten perspectives.Comment: 43 page
Electromagnetic structure of the deuteron
Recent measurements of the deuteron electromagnetic structure functions A, B,
and extracted from high energy elastic scattering, and the cross
sections and asymmetries extracted from high energy photodisintegration
, are reviewed and compared to theory. The theoretical
calculations range from nonrelativistic and relativistic models using the
traditional meson and baryon degrees of freedom, to effective field theories,
to models based on the underlying quark and gluon degrees of freedom of QCD,
including nonperturbative quark cluster models and perturbative QCD. We review
what has been learned from these experiments, and discuss why elastic
scattering and photodisintegration seem to require very different theoretical
approaches, even though they are closely related experimentally.Comment: review paper; 93 pages, 35 figure
Supporting renewable energy in Latin America and the Caribbean: lessons to learn from innovation theory
Prioritising the best use of biomass resources: conceptualising trade-offs
02.09.13 KB. Ok to add report to Spiral. Authors hold copyrightUsing biomass to provide energy services is one of the most versatile options for increasing the proportion of renewable energy in the existing system. This report reviews metrics used to compare alternative bio-energy pathways and identifies limitations inherent in the way that they are calculated and interpreted. It also looks at how companies and investors approach strategic decisions in the bio-energy area. Bio-energy pathways have has physical and economic attributes that can be measured or modelled. These include: the capital cost, operating cost, emissions to air, land and water. Conceptually, comparing alternative pathways is as simple as selecting the attributes and metrics you consider to be most important and ranking the alternative pathways accordingly. At an abstract level there is good agreement about which features of bio-energy pathways are desirable, but there is little agreement about which performance metrics best capture all the relevant information about a bio-energy pathway. Between studies there is also a great deal of variation and this impedes comparison. Common metrics describe energetic performance, economic performance, environmental performance (emissions, land and water use), and social and ecological performance. Compound metrics may be used to integrate multiple attributes but their highly aggregate nature may make them difficult to interpret. Insights that may be drawn from the analysis include:
Technology transfer needs and experiences: The NASA Research Center perspective
Viewgraphs on technology transfer needs and experiences - the NASA Research Center perspective are provided. Topics covered include: functions of NASA, incentives and benefits, technology transfer mechanisms, economics of technology commercialization, examples, and conclusions
High-precision covariant one-boson-exchange potentials for np scattering below 350 MeV
All realistic potential models for the two-nucleon interaction are to some
extent based on boson exchange. However, in order to achieve an essentially
perfect fit to the scattering data, characterized by a chi2/Ndata ~ 1, previous
potentials have abandoned a pure one boson-exchange mechanism (OBE). Using a
covariant theory, we have found a OBE potential that fits the 2006 world np
data below 350 MeV with a chi2/Ndata = 1.06 for 3788 data. Our potential has
fewer adjustable parameters than previous high-precision potentials, and also
reproduces the experimental triton binding energy without introducing
additional irreducible three-nucleon forces.Comment: 4 pages; revised version with augmented data sets; agrees with
published versio
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