167,347 research outputs found
Infinite Nuclear Matter on the Light Front: A Modern Approach to Brueckner Theory
Understanding an important class of experiments requires that light-front
dynamics and related light cone variables k^+ and k_perp be used. If one uses
k^+ as a momentum variable, the corresponding canonical spatial variable is
x^-=x^0-x^3 and the time variable is x^0+x^3. This is the light front (LF)
approach of Dirac. A relativistic light front formulation of nuclear dynamics
is developed and applied to treating infinite nuclear matter in a method which
includes the corelations of pairs of nculeons. This is light front Brueckner
theory.Comment: 7 pages, text of an invited talk presented at the 10th International
Conference on Recent Progress In Many-Body Theories. To be published by World
Scientific as volume 3 of "Series on Advances in Quantum Many-Body Theory",
eds. R.F. Bishop, C.E. Campbell, J.W. Clark and S. Fanton
Low to high temperature energy conversion system
A method for converting heat energy from low temperature heat sources to higher temperature was developed. It consists of a decomposition chamber in which ammonia is decomposed into hydrogen and nitrogen by absorbing heat of decomposition from a low temperature energy source. A recombination reaction then takes place which increases the temperature of a fluid significantly. The system is of use for the efficient operation of compact or low capital investment turbine driven electrical generators, or in other applications, to enable chemical reactions that have a critical lower temperature to be used. The system also recovers heat energy from low temperature heat sources, such as solar collectors or geothermal sources, and converts it to high temperatures
ULS FY14 Planning and Budget Report
This document was submitted by the University Library System (ULS) to the University of Pittsburgh's provost's office on March 1, 2013. Incorporating the work of the ULS FY14 Planning Task Force, it reports ULS accomplishments for 2012-2013 and strategic priorities for 2013-2014
Plain Meaning, Precedent, and Metaphysics: Interpreting the “Point Source” Element of the Clean Water Act Offense
This Article, the fourth in a series of five, examines the continuing struggles to define “point source” and “nonpoint source” under the Clean Water Act. State regulation of nonpoint sources is neither pervasive nor robust, and most continuing water pollution problems can be traced primarily to nonpoint sources. EPA should define nonpoint sources by regulation and begin to expand the definition of point source by incorporating established case law and Agency practice to bring more nonpoint sources into the point source definition
The lunar cart
Expanded experiment-carrying capability, to be used between the Apollo 11 capability and the lunar roving vehicle capability, was defined for the lunar surface crewmen. Methods used on earth to satisfy similar requirements were studied. A two-wheeled cart was built and tested to expected mission requirements and environments. The vehicle was used successfully on Apollo 14
Improved dispensing targets for ion beam particle generators
Beam impinges on palladium-silver tube, which is target, and heats impinged surface causing local hot spot. Contained gas diffuses through hot spot to meet incoming beam and produce desired particles. When beam is turned off, target spot cools and stops dispensing contained gas
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