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  2. Glossary of mathematical symbols - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_mathematical...

    A mathematical symbol is a figure or a combination of figures that is used to represent a mathematical object, an action on mathematical objects, a relation between mathematical objects, or for structuring the other symbols that occur in a formula.

  3. Variable-frequency drive - Wikipedia

    en.wikipedia.org/wiki/Variable-frequency_drive

    Small variable-frequency drive Chassis of above VFD (cover removed). A variable-frequency drive (VFD, or adjustable-frequency drive, adjustable-speed drive, variable-speed drive, AC drive, micro drive, inverter drive, or drive) is a type of AC motor drive (system incorporating a motor) that controls speed and torque by varying the frequency of the input electricity.

  4. Digital biquad filter - Wikipedia

    en.wikipedia.org/wiki/Digital_biquad_filter

    In signal processing, a digital biquad filter is a second order recursive linear filter, containing two poles and two zeros. "Biquad" is an abbreviation of "biquadratic", which refers to the fact that in the Z domain, its transfer function is the ratio of two quadratic functions:

  5. Plasma-enhanced chemical vapor deposition - Wikipedia

    en.wikipedia.org/wiki/Plasma-enhanced_chemical...

    Plasma-enhanced chemical vapor deposition (PECVD) is a chemical vapor deposition process used to deposit thin films from a gas state to a solid state on a substrate. Chemical reactions are involved in the process, which occur after creation of a plasma of the reacting gases.

  6. High-voltage direct current - Wikipedia

    en.wikipedia.org/wiki/High-voltage_direct_current

    Long distance HVDC lines carrying hydroelectricity from Canada's Nelson River to this converter station where it is converted to AC for use in southern Manitoba's grid. A high-voltage direct current (HVDC) electric power transmission system uses direct current (DC) for electric power transmission, in contrast with the more common alternating current (AC) transmission systems. [1]

  7. How To Save Money by Splitting Your Direct Deposit ... - AOL

    www.aol.com/finance/save-money-splitting-direct...

    Direct deposit is a convenient way to receive your paycheck, tax refund or Social Security benefits. Instead of waiting for the check to arrive and then waiting in line to cash or deposit it, the...

  8. Recurring deposit - Wikipedia

    en.wikipedia.org/wiki/Recurring_deposit

    A recurring deposit is a special kind of term deposit in India that is offered by Indian banks and India Post which helps people with regular incomes to deposit a fixed amount every month into their recurring deposit account and earn interest at the rate applicable to fixed deposits.

  9. Electroforming - Wikipedia

    en.wikipedia.org/wiki/Electroforming

    The main advantage of electroforming is that it accurately replicates the external shape of the mandrel. Generally, machining a cavity accurately is more challenging than machining a convex shape; however, the opposite holds true for electroforming because the mandrel's exterior can be accurately machined and then used to electroform a precision cavity.