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  2. Building envelope - Wikipedia

    en.wikipedia.org/wiki/Building_envelope

    Discussion. The building envelope or enclosure is all of the elements of the outer shell that maintain a dry, heated, or cooled indoor environment and facilitate its climate control. Building envelope design is a specialized area of architectural and engineering practice that draws from all areas of building science and indoor climate control.

  3. Flight envelope - Wikipedia

    en.wikipedia.org/wiki/Flight_envelope

    Flight envelope is one of a number of related terms that are used in a similar fashion. It is perhaps the most common term because it is the oldest, first being used in the early days of test flight. It is closely related to more modern terms known as extra power and a doghouse plot which are different ways of describing the flight envelope of ...

  4. Envelope tracking - Wikipedia

    en.wikipedia.org/wiki/Envelope_Tracking

    Envelope tracking waveform. Envelope tracking (ET) describes an approach to radio frequency (RF) amplifier design in which the power supply voltage applied to the RF power amplifier is continuously adjusted to ensure that the amplifier is operating at peak efficiency for power required at each instant of transmission.

  5. Envelope - Wikipedia

    en.wikipedia.org/wiki/Envelope

    An envelope is a common packaging item, usually made of thin, flat material. It is designed to contain a flat object, such as a letter or card. Traditional envelopes are made from sheets of paper cut to one of three shapes: a rhombus, a short-arm cross or a kite. These shapes allow the envelope structure to be made by folding the sheet sides ...

  6. Building enclosure commissioning - Wikipedia

    en.wikipedia.org/wiki/Building_enclosure...

    Building enclosure commissioning. Building Enclosure Commissioning ( BECx) (sometimes 'envelope' is used instead of 'enclosure') is a quality-focused process wherein the energy performance of a facility, system or assembly is evaluated and verified against defined objectives and criteria. The process itself is carried out by a commissioning ...

  7. Back-of-the-envelope calculation - Wikipedia

    en.wikipedia.org/wiki/Back-of-the-envelope...

    Back-of-the-envelope calculation. A back-of-the-envelope calculation is a rough calculation, typically jotted down on any available scrap of paper such as an envelope. It is more than a guess but less than an accurate calculation or mathematical proof. The defining characteristic of back-of-the-envelope calculations is the use of simplified ...

  8. Postal stationery - Wikipedia

    en.wikipedia.org/wiki/Postal_stationery

    A piece of postal stationery is a stationery item, such as a stamped envelope, letter sheet, postal card, lettercard, aerogram or wrapper, with an imprinted stamp or inscription indicating that a specific rate of postage or related service has been prepaid. [1] [2] It does not, however, include any postcard without a pre-printed stamp, [3] and ...

  9. Envelope (music) - Wikipedia

    en.wikipedia.org/wiki/Envelope_(music)

    Envelope (music) In sound and music, an envelope describes how a sound changes over time. For example, a piano key, when struck and held, creates a near-immediate initial sound which gradually decreases in volume to zero. An envelope may relate to elements such as amplitude (volume), frequency (with the use of filters) or pitch.

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