51,168 research outputs found

    Lightweight refractory insulation and method of preparing the same Patent

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    Preparation and characteristics of lightweight refractory insulatio

    Improved thermal insulation materials made of foamed refractory oxides

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    Foamed refractory oxides provide lightweight, reflective thermal insulation materials. The materials have a low bulk density and high thermal shock resistance

    Molecular Dynamics Simulation of Collisions between Hydrogen and Graphite

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    Hydrogen adsorption by graphite is examined by classical molecular dynamics simulation using a modified Brenner REBO potential. Such interactions are typical in chemical sputtering experiments, and knowledge of the fundamental behavior of hydrogen and graphene in collisional conditions is essential for modeling the sputtering mechanism. The hydrogen adsorption rate is found to be dependent on the incident hydrogen energy and not on graphene temperature. Rather than destroying the graphene, hydrogen incidence at energies of less than 100 eV can be classified into three regimes of adsorption, reflection and penetration through one or more graphene layers. Incidence at the lowest energies is shown to distort the graphene structure.Comment: 4 pages, 4 figures. Accepted for publication by j. Plasma Phys. Proccedings for the joint conference of 19th International Conference on Numerical Simulation of Plasmas and 7th Asia Pacific Plasma Theor

    Universal low-temperature properties of quantum and classical ferromagnetic chains

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    We identify the critical theory controlling the universal, low temperature, macroscopic properties of both quantum and classical ferromagnetic chains. The theory is the quantum mechanics of a single rotor. The mapping leads to an efficient method for computing scaling functions to high accuracy.Comment: 4 pages, 2 tables and 3 Postscript figure

    Development of lightweight thermal insulation materials for rigid heat shields Final summary report, 25 Jun. 1964 - 25 Sep. 1966

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    Lightweight ceramic foam for thermal insulation heat shields of launch structure

    Numerical Computation of Thermoelectric and Thermomagnetic Effects

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    Phenomenological equations describing the Seebeck, Hall, Nernst, Peltier, Ettingshausen, and Righi-Leduc effects are numerically solved for the temperature, electric current, and electrochemical potential distributions of semiconductors under magnetic field. The results are compared to experiments.Comment: 4 pages, 7 figures. Submitted to Proceedings of XVII International Conference on Thermoelectrics (ICT98), 1998 Nagoya, Japa
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