3,720 research outputs found
Randomizations of models as metric structures
The notion of a randomization of a first order structure was introduced by
Keisler in the paper Randomizing a Model, Advances in Math. 1999. The idea was
to form a new structure whose elements are random elements of the original
first order structure. In this paper we treat randomizations as continuous
structures in the sense of Ben Yaacov and Usvyatsov. In this setting, the
earlier results show that the randomization of a complete first order theory is
a complete theory in continuous logic that admits elimination of quantifiers
and has a natural set of axioms. We show that the randomization operation
preserves the properties of being omega-categorical, omega-stable, and stable
General Concentric Black Rings
Supersymmetric black ring solutions of five dimensional supergravity coupled
to an arbitrary number of vector multiplets are constructed. The solutions are
asymptotically flat and describe configurations of concentric black rings which
have regular horizons with topology and no closed time-like
curves at the horizons.Comment: 8 pages, minor alterations, typos corrected. Version to be published
in PR
STARLING CONTROL IN LIVESTOCK FEEDING AREAS
The Denver Wildlife Research Center has been investigating methods to combat starling (Sturnus vulgaris) problems at livestock feeding areas since 1960. A variety of chemicals, baits, and methods of bait placement have been tested. This paper summarizes these investigations.
CHEMICALS TESTED About 500 chemicals have been screened for toxic and stupefacient effects on starlings. Although several chemicals have been found that immobilize starlings in the laboratory, they have been largely ineffective in the field; most starlings regurgitate the treated baits, and seldom have substantial numbers been affected. Of the toxicants screened, four compounds, TEPP, DRC-632, DRC-1327, and DRC-1339, have shown enough activity as control agents for starlings to warrant intensive investigation in the laboratory and the field
Neurophysiology
Contains reports on four research projects.Bell Telephone Laboratories, Inc.U.S. Air Force (Aeronautical Systems Division) under Contract AF 33(615)-1747National Aeronautics and Space Administration (Grant NsG-496)National Institutes of Health (Grant MH-04737-05)National Science Foundation (Grant GP-2495)The Teagle Foundation, Inc
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