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  • 1
    Electronic Resource
    Electronic Resource
    On the Existence and the Uniform Decay of a Hyperbolic Equation with Non-Linear Boundary Conditions (2000)
    Springer
    Southeast Asian bulletin of mathematics 24 (2000), S. 183-199 
    Details
    ISSN: 0219-175X
    Keywords: Galerkin approximation ; uniform decay ; non-linear boundary conditions ; potentials
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Notes: Abstract In this paper, we study a hyperbolic model based on the equation $$y_{tt}-\Delta_{y} + \sum_{j = 1}^{n}b_j(x,t)\frac{\partial y_{t}}{\partial x_j}= 0 $$ with nonlinear boundary conditions given by $$\frac{\partial y}{\partial v}+ f(y) + g(y_t)= 0$$ . We prove the existence and the uniqueness of global solutions. Also, we obtain the uniform decay of the energy without control of its derivative sign.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s10012-000-0183-6
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    Paper (German National Licenses)
    Fulltext
  • 2
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    Toxicity of pyrolysis gases from synthetic polymers (1977)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The screening test method was used to investigate toxicity in polyethylene, polystyrene, polymethyl methacrylate, polyaryl sulfone, polyether sulfone, polyphenyl sulfone, and polyphenylene sulfide. Changing from a rising temperature program to a fixed temperature program resulted on shorter times to animal responses. This effect was attributed in part to more rapid generation of toxicants. The toxicants from the sulfur containing polymers appeared to act more rapidly than the toxicants from the other polymers. It was not known whether this effect was due primarily to difference in concentration or in the nature of the toxicants. The carbon monoxide concentration found did not account for the results observed with the sulfur containing polymers. Polyphenyl sulfone appeared to exhibit the least toxicity among the sulfur containing polymers evaluated under these test conditions.
    Keywords: CHEMISTRY AND MATERIALS (GENERAL)
    Type: NASA-TM-78458 , A-7297
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Effect of heating rate on toxicity of pyrolysis gases from some synthetic polymers (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The effect of heating rate on the toxicity of the pyrolysis gases from some synthetic polymers was investigate, using a screening test method. The synthetic polymers were polyethylene, polystyrene, polymethyl methacrylate, polycarbonate, ABS, polyaryl sulfone, polyether sulfone, and polyphenylene sulfide. The toxicants from the sulfur-containing polymers appeared to act more rapidly than the toxicants from the other polymers. It is not known whether this effect is due primarily to differences in concentration or in the nature of the toxicants. The carbon monoxide concentrations found do not account for the observed results.
    Keywords: NONMETALLIC MATERIALS
    Type: Journal of Combustion Toxicology; 4; Nov. 197
    Format: text
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    NASA TECHNICAL REPORTS
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