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A Theorem on Series of Orthogonal Functions with an by Birkhoff G.D. PDF

By Birkhoff G.D.

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Extra resources for A Theorem on Series of Orthogonal Functions with an Application to Strum-Liouville Series (1917)(en)

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The equipment must have at least enclosure protection IP 5X, or IP 6X where conductive dust is present. 3 - Temperature limits for dust in Ex zones The surface temperature of the equipment must not be high enough to ignite whirling dust or dust that is deposited on the equipment. The following conditions must be fulfilled: a) The surface temperature must not exceed 2/3 of the ignition temperature in °C for the dust-air mixture concerned. b) On surfaces where a dangerous accumulation of dust that could smolder is not effectively prevented, the surface temperature must not rise above a level 75°C below the smoldering temperature of the particular dust.

This equipment must conform to the fundamental health and safety regulations. The manufacturer must, as a minimum, apply the internal production inspection procedure, as in the EU Directive, Annex II and VIII). - All equipment is permitted that does not generate sparks, arcing or unacceptably high temperatures in fault-free operation. “Unacceptable” is a temperature that is as high as or exceeds the ignition temperature of the flammable materials concerned. g. manufacturer’s certification, operating instructions).

The parts that could ignite a potentially explosive atmosphere, through sparking or heating, are encapsulated (potted) in a potting compound, so that the potentially explosive atmosphere cannot be ignited. Intrinsically safe systems “i -SYST” EN 50 039 Non-sparking “n” EN 50 021 This standard is a supplement to EN 50 020 (Intrinsic safety “i”), whereby the requirements of that standard are to be applied, with the exception of the marking of electrical equipment in intrinsically safe systems laid down in Section 10.

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A Theorem on Series of Orthogonal Functions with an Application to Strum-Liouville Series (1917)(en) by Birkhoff G.D.


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