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  2. Energy efficiency in transport - Wikipedia

    en.wikipedia.org/wiki/Energy_efficiency_in_transport

    The energy efficiency in transport is the useful travelled distance, of passengers, goods or any type of load; divided by the total energy put into the transport propulsion means. The energy input might be rendered in several different types depending on the type of propulsion, and normally such energy is presented in liquid fuels , electrical ...

  3. Telecommunications - Wikipedia

    en.wikipedia.org/wiki/Telecommunications

    The effective capacity to exchange information worldwide through two-way telecommunication networks grew from 281 petabytes (PB) of optimally compressed information in 1986 to 471 PB in 1993 to 2.2 exabytes (EB) in 2000 to 65 EB in 2007. [37]

  4. Economic history of the United States - Wikipedia

    en.wikipedia.org/wiki/Economic_history_of_the...

    Hot blast is a method of using heat from the blast furnace exhaust gas to preheat combustion air, saving a considerable amount of fuel. It allowed much higher furnace temperatures and increased the capacity of furnaces. Hot blast allowed blast furnaces to use anthracite or lower grade coal. Anthracite was difficult to light with cold blast.

  5. Sampling (statistics) - Wikipedia

    en.wikipedia.org/wiki/Sampling_(statistics)

    A visual representation of the sampling process. In statistics, quality assurance, and survey methodology, sampling is the selection of a subset or a statistical sample (termed sample for short) of individuals from within a statistical population to estimate characteristics of the whole population.

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