3,600 research outputs found

    On the Localization of One-Photon States

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    Single photon states with arbitrarily fast asymptotic power-law fall-off of energy density and photodetection rate are explicitly constructed. This goes beyond the recently discovered tenth power-law of the Hellwarth-Nouchi photon which itself superseded the long-standing seventh power-law of the Amrein photon.Comment: 7 pages, tex, no figure

    Evaluation of the energy transfer in the char zone during ablation. Part 2: In-depth response of ablative composites, volume 1

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    The decomposition of ablative composites is described along with the transport phenomena of pyrolysis gases which result from the decomposition of these plastics as they flow through the porous char of char-forming ablators. The pyrolysis products are those formed by the thermal degradation of nylon-phenolic resin and silicone elastomer composites. Emphasis is placed on the nature and extent of chemical reactions of the pyrolysis products and the char, along with the energy absorbed by the combined pyrolysis and char zone. Chemical reactions with thermodynamically consistent kinetic data are determined in order to develop a realistic analysis for predicting the thermal performance of ablative heat shields

    Computation of the equilibrium composition of reacting gas-solid mixtures with material and energy balance constraints Status report

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    Equilibrium composition computed for reacting- gas-solid composite materials using material and energy constraint

    Thermodynamic properties in polynomial form for carbon, hydrogen, nitrogen, and oxygen systems from 300 to 15000 K

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    Thermodynamic properties in polynomial form for carbon, hydrogen, nitrogen, and oxygen systems form 300 to 15000

    Experimental verification of the non-equilibrium model for predicting behavior in the char zone of a charring ablator Status report

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    Experimental simulation to establish accuracy of nonequilibrium flow model with system simulating charring during ablatio

    Solution of the Frozen Flow Momentum Equation Status Report

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    Momentum equation solved for frozen flow in char zone of charring ablato

    Solid State Physics

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    Contains reports on two research projects

    Spatially Explicit Decision Support for Watershed Management on Military Lands: Stream Integrity, Interactive Programming, and Best Management Practices

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    2012 S.C. Water Resources Conference - Exploring Opportunities for Collaborative Water Research, Policy and Managemen

    Cosmological Parameters from the Comparison of the 2MASS Gravity Field with Peculiar Velocity Surveys

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    We compare the peculiar velocity field within 65 h−1h^{-1} Mpc predicted from 2MASS photometry and public redshift data to three independent peculiar velocity surveys based on type Ia supernovae, surface brightness fluctuations in ellipticals, and Tully-Fisher distances to spirals. The three peculiar velocity samples are each in good agreement with the predicted velocities and produce consistent results for \beta_{K}=\Omega\sbr{m}^{0.6}/b_{K}. Taken together the best fit βK=0.49±0.04\beta_{K} = 0.49 \pm 0.04. We explore the effects of morphology on the determination of β\beta by splitting the 2MASS sample into E+S0 and S+Irr density fields and find both samples are equally good tracers of the underlying dark matter distribution, but that early-types are more clustered by a relative factor b\sbr{E}/b\sbr{S} \sim 1.6. The density fluctuations of 2MASS galaxies in 8h−18 h^{-1} Mpc spheres in the local volume is found to be \sigma\sbr{8,K} = 0.9. From this result and our value of βK\beta_{K}, we find \sigma_8 (\Omega\sbr{m}/0.3)^{0.6} = 0.91\pm0.12. This is in excellent agreement with results from the IRAS redshift surveys, as well as other cosmological probes. Combining the 2MASS and IRAS peculiar velocity results yields \sigma_8 (\Omega\sbr{m}^/0.3)^{0.6} = 0.85\pm0.05.Comment: 11 pages, ApJ accepte
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