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In contrast with a non-magnetic topological insulator, a magnetic topological insulator can have naturally gapped surface states as long as the quantizing symmetry is broken at the surface. These gapped surfaces exhibit a topologically protected half-quantized surface anomalous Hall conductivity ( e 2 / 2 h {\displaystyle e^{2}/2h ...
For example, information on microfilm is destroyed at 65.5 °C (149.9 °F) (a.k.a. Class 150) [citation needed] and magnetic media (such as data tapes) lose data above 51.7 °C (125.1 °F) (a.k.a. Class 125). [citation needed] Fireproof vaults built to meet the more stringent Class 125 requirement are called data-rated vaults. [citation needed]
The primary functions of a fireback are to protect the wall at the back of the fireplace and radiate heat from the fire into the room. The protection was especially important where the wall was constructed of insubstantial material such as daub (a mud and straw mixture coating interwoven wooden wattles), brick or soft stone.
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Electric underfloor heating systems cause low frequency magnetic fields (in the 50–60 Hz range), old 1-wire systems much more so than modern 2-wire systems. [49] [50] The International Agency for Research on Cancer (IARC) has classified static and low-frequency magnetic fields as possibly carcinogenic (Group 2B). [51]
A fireplace insert [1] is a device that can be inserted into an existing masonry or prefabricated wood fireplace. Fireplace inserts can be fuelled by gas, wood, electricity, coal, or wood pallet. Most fireplace inserts are made from cast iron or steel. Fresh air enters through vents below the insert, where it then circulates around the main ...