181,557 research outputs found
Sets and C^n; Quivers and A-D-E; Triality; Generalized Supersymmetry; and D4-D5-E6
The relation between Geisteswissenschaft and Naturwissenschaft has been
discussed by Munster in hep-th/9305104. The plan of this paper is to begin with
the empty set; use it to form sets and quivers (sets of points plus sets of
arrows between pairs of points); and then use them to make complex vector
spaces and to get the A-D-E Coxeter-Dynkin diagrams. The Dn Spin(2n) Lie
algebras have spinor representations to describe fermions. D4 Spin(8) triality
gives automorphisms among its vector and two half-spinor representations. D5
Spin(10) contains both Spin(8) and the complexification of the vector
representation of Spin(8). E6 contains both Spin(10) and the two half-spinor
representations of Spin(10), and therefore contains the adjoint representation
of Spin(8) and the complexifications of the vector and the two half-spinor
representations of Spin(8). E6 is the basis for construction of a fundamental
model of physics that is consistent with experiment (see hep-th/9302030,
hep-ph/9301210).Comment: 1+22 pages, THEP-93-5, LaTe
The role of high resolution observations in determining energy release and transport processes
With present observations from the Solar Maximum Mission, we are seeing a very selective sample of spatially large flares in the soft part (10 to 50 keV) of the hard X-ray spectrum. The spatial resolution is at best 5600 km with a corresponding time resolution of 4.5 s for adequate count statistics. This resolution gives rise to the following problems: We cannot resolve the minor radii of the loops involved or tell where and how the energy release occurs. The manner in which loops interact and the relationship between the soft and hard or approx 00 keV) parts of hard X-rays remains elusive. We cannot see how energy propagates in most cases. Thus it is desirable to determine the minimum increase in spatial and temporal resolution required to solve these problems. Spatially we need to resolve the minor radius of a small loop which is about 800 km or 1 arc s. Upper limits to observed speeds of conduction fronts and shocks are approx km/s with theoretical limits running about a factor of 2 higher. Thus, a compatible minimum time resolution is in the range of 0.2 to 0.4 s. With these spatial and temporal resolutions, sufficient count statistics are required to go up to approx 120 keV with a sufficient number of energy bands to obtain spectra
Experimental study and evaluation of radioprotective drugs
Experimental study evaluates radioprotective drugs administered before exposure either orally or intravenously. Specifically studied are the sources of radiation, choice of radiation dose, choice of animals, administration of drugs, the toxicity of protective agents and types of protective drug
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