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Another memory trick to calculate the allowed downtime duration for an "-nines" availability percentage is to use the formula seconds per day. For example, 90% ("one nine") yields the exponent 4 − 1 = 3 {\displaystyle 4-1=3} , and therefore the allowed downtime is 8.64 × 10 3 {\displaystyle 8.64\times 10^{3}} seconds per day.
Uptime is a measure of system reliability, expressed as the period of time a machine, typically a computer, has been continuously working and available.Uptime is the opposite of downtime.
Today, steam, evaporator, and condenser coils are made from copper and copper alloys. [3] These heat exchangers are used in air conditioning and refrigeration systems, industrial and central heating and cooling systems, radiators , hot water tanks , and under-floor heating systems.
The Apollo program, also known as Project Apollo, was the United States human spaceflight program led by NASA, which succeeded in landing the first men [2] on the Moon in 1969, following Project Mercury, which put the first Americans in space.
Iron is a chemical element with symbol Fe and atomic number 26, essential for human life and widely used in various industries.
The atmospheric attenuation of microwaves in dry air with a precipitable water vapor level of 0.001 mm. The downward spikes in the graph corresponds to frequencies at which microwaves are absorbed more strongly, such as by oxygen molecules.
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