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A03 Ventilation Design topic, the WELL assured building to have existing or new mechanical ventilation systems following ASHRAE 62.1-2 or EN standard 16798-1 or AS 1668.2 or CIBSE Guide A: Environmental Design. Naturally ventilation can also be used without mechanical ventilation system if the design follows Natural Ventilation Procedure in ...
Feather Christmas trees ranged widely in size, from a small 5-centimeter (2 in) tree to a large 2.5-meter (98 in) tree sold in department stores during the 1920s. [121] Often, the tree branches were tipped with artificial red berries which acted as candle holders .
Fluorescent lamps with magnetic ballasts flicker at a normally unnoticeable frequency of 100 or 120 Hz and this flickering can cause problems for some individuals with light sensitivity; [69] they are listed as problematic for some individuals with autism, epilepsy, [70] lupus, [71] chronic fatigue syndrome, Lyme disease, [72] and vertigo.
A replica of a Victorian zoetrope. A zoetrope is a pre-film animation device that produces the illusion of motion, by displaying a sequence of drawings or photographs showing progressive phases of that motion.
In the 6.5×55mm Ackley Improved the cartridge case capacity is raised to approximately 4.03 ml (62.2 g H 2 O). The Ackley Improved family of wildcat cartridges is designed to be easily made by rechambering existing firearms, and fireforming the ammunition to decrease body taper and increase shoulder angle, resulting in a higher case capacity.
The first white light-emitting diodes (LEDs) were offered for sale in the autumn of 1996. [24] Nichia made some of the first white LEDs which were based on blue LEDs with Ce:YAG phosphor. [ 25 ] Ce:YAG is often grown using the Czochralski method .
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