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  2. Chemical plant cost indexes - Wikipedia

    en.wikipedia.org/wiki/Chemical_plant_cost_indexes

    Chemical Engineering Index, CE: composed of 4 major components – for equipment and other bulk items, the others relevant to construction labor, buildings, and engineering and supervision – the index is employed primary as a process plant construction index, was established using a base period of 1957-1959 as 100. The CE Index is updated ...

  3. Cost-of-living index - Wikipedia

    en.wikipedia.org/wiki/Cost-of-living_index

    A cost-of-living index is a conceptual measurement goal, however, not a straightforward alternative to the CPI. A cost-of-living index would measure changes over time in the amount that consumers need to spend to reach a certain utility level or standard of living. Both the CPI and a cost-of-living index would reflect changes in the prices of ...

  4. Sleep deprivation - Wikipedia

    en.wikipedia.org/wiki/Sleep_deprivation

    Treatment. Cognitive behavioral therapy, caffeine (to induce alertness), sleeping pills. Sleep deprivation, also known as sleep insufficiency[2] or sleeplessness, is the condition of not having adequate duration and/or quality of sleep to support decent alertness, performance, and health. It can be either chronic or acute and may vary widely in ...

  5. Sleep efficiency - Wikipedia

    en.wikipedia.org/wiki/Sleep_efficiency

    Sleep efficiency (SE) is the ratio between the time a person spends asleep, and the total time dedicated to sleep (i.e. both sleeping and attempting to fall asleep or fall back asleep). It is given as a percentage. [1] SE of 80% or more is considered normal/healthy with most young healthy adults displaying SE above 90%.

  6. Sleep medicine - Wikipedia

    en.wikipedia.org/wiki/Sleep_medicine

    Sleep medicine is a medical specialty or subspecialty devoted to the diagnosis and therapy of sleep disturbances and disorders. [1] From the middle of the 20th century, research has provided increasing knowledge of, and answered many questions about, sleep–wake functioning. [2] The rapidly evolving field [3] has become a recognized medical ...

  7. Price index - Wikipedia

    en.wikipedia.org/wiki/Price_index

    Price index. A price index (plural: "price indices" or "price indexes") is a normalized average (typically a weighted average) of price relatives for a given class of goods or services in a given region, during a given interval of time. It is a statistic designed to help to compare how these price relatives, taken as a whole, differ between ...

  8. Electroencephalography - Wikipedia

    en.wikipedia.org/wiki/Electroencephalography

    There can be an increase in theta frequencies. Santamaria and Chiappa cataloged a number of the variety of patterns associated with drowsiness. Stage II sleep is characterized by sleep spindles – transient runs of rhythmic activity in the 12–14 Hz range (sometimes referred to as the "sigma" band) that have a frontal-central maximum.

  9. Lang factor - Wikipedia

    en.wikipedia.org/wiki/Lang_factor

    The Lang Factor is an estimated ratio of the total cost of creating a process within a plant, to the cost of all major technical components. It is widely used in industrial engineering to calculate the capital and operating costs of a plant. [1][2][3] The factors were introduced by H. J. Lang and Dr Micheal Bird in Chemical Engineering magazine ...

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