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  2. Wind turbine design - Wikipedia

    en.wikipedia.org/wiki/Wind_turbine_design

    Wind turbine components : 1- Foundation, 2- Connection to the electric grid, 3- Tower, 4-Access ladder, 5- Wind orientation control (Yaw control), 6- Nacelle, 7- Generator, 8- Anemometer, 9- Electric or Mechanical Brake, 10- Gearbox, 11- Rotor blade, 12- Blade pitch control, 13- Rotor hub. Wind turbine design is the process of defining the form ...

  3. Coupon (finance) - Wikipedia

    en.wikipedia.org/wiki/Coupon_(finance)

    Coupon (finance) In finance, a coupon is the interest payment received by a bondholder from the date of issuance until the date of maturity of a bond . Coupons are normally described in terms of the "coupon rate", which is calculated by adding the sum of coupons paid per year and dividing it by the bond's face value.

  4. 1% rule - Wikipedia

    en.wikipedia.org/wiki/1%_rule

    In Internet culture, the 1% rule is a general rule of thumb pertaining to participation in an Internet community, stating that only 1% of the users of a website actively create new content, while the other 99% of the participants only lurk. Variants include the 1–9–90 rule (sometimes 90–9–1 principle or the 89:10:1 ratio ), [1] which states that in a collaborative website such as a ...

  5. Percentage - Wikipedia

    en.wikipedia.org/wiki/Percentage

    In mathematics, a percentage (from Latin per centum 'by a hundred') is a number or ratio expressed as a fraction of 100. It is often denoted using the percent sign (%), [1] although the abbreviations pct., pct, and sometimes pc are also used. [2] A percentage is a dimensionless number (pure number), primarily used for expressing proportions, but percent is nonetheless a unit of measurement in ...