13,470 research outputs found
Canonical Formulation of A Bosonic Matter Field in 1+1 Dimensional Curved Space
We study a Bosonic scalar in 1+1 dimensional curved space that is coupled to
a dynamical metric field. This metric, along with the affine connection, also
appears in the Einstein-Hilbert action when written in first order form. After
illustrating the Dirac constraint analysis in Yang-Mills theory, we apply this
formulation to the Einstein-Hilbert action and the action of the Bosonic scalar
field, first separately and then together. Only in the latter case does a
dynamical degree of freedom emerge.Comment: 21 page
The Compositional Nature of Verb and Argument Representations in the Human Brain
How does the human brain represent simple compositions of objects, actors,and
actions? We had subjects view action sequence videos during neuroimaging (fMRI)
sessions and identified lexical descriptions of those videos by decoding (SVM)
the brain representations based only on their fMRI activation patterns. As a
precursor to this result, we had demonstrated that we could reliably and with
high probability decode action labels corresponding to one of six action videos
(dig, walk, etc.), again while subjects viewed the action sequence during
scanning (fMRI). This result was replicated at two different brain imaging
sites with common protocols but different subjects, showing common brain areas,
including areas known for episodic memory (PHG, MTL, high level visual
pathways, etc.,i.e. the 'what' and 'where' systems, and TPJ, i.e. 'theory of
mind'). Given these results, we were also able to successfully show a key
aspect of language compositionality based on simultaneous decoding of object
class and actor identity. Finally, combining these novel steps in 'brain
reading' allowed us to accurately estimate brain representations supporting
compositional decoding of a complex event composed of an actor, a verb, a
direction, and an object.Comment: 11 pages, 6 figure
Exploring Point of Sale Strategies for Improving Seafood Retailing: The Case of the Australian Oyster Industry
The commodification of many food products, combined with increasing market share of supermarkets, has increased the importance of point of sale (POS) strategies in speciality food retailers such as fishmongers. The purpose of this study is to develop strategies to improve the retailing of seafood in fishmongers, specifically oysters, a species which is currently underutilised; as although they are eaten by many consumers, purchase frequency is low. A literature review identifies the key drivers and barriers to oyster consumption and the information consumers want at the POS. Based on these findings, a retailing strategy for oysters is developed and tested in two consumer focus groups. Based on focus group results, revisions are recommended to the retail strategy, importantly including a change in collateral from a production focus to a consumption focus. This study makes a clear contribution to theory and practice by bringing together the existing literature on drivers and barriers and consumer information requirements about oysters to develop and test practical retail strategy concepts
Analytical sun synchronous low-thrust manoeuvres
Article describes analytical sun synchronous low-thrust manoeuvres
Quantum Theory of Black Holes
A solvable 2-dimensional conformally invariant midi-superspace model for
black holes is obtained by imposing spherical symmetry in 4-dimensional
conformally invariant Einstein gravity. The Wheeler-DeWitt equation for the
theory is solved exactly to obtain the unique quantum wave functional for an
isolated black hole with fixed mass. By suitably relaxing the boundary
conditions, a non-perturbative ansatz is obtained for the wave functional of a
black hole interacting with its surroundings.Comment: Plain-TeX, 13 pages, no figures, WIN-92-9, UNB Tech. Rep. 92-0
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