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  2. Lists of problems - Wikipedia

    en.wikipedia.org/wiki/Lists_of_problems

    The following articles contain lists of problems: List of philosophical problems; List of undecidable problems; Lists of unsolved problems; List of NP-complete problems;

  3. Central vacuum system - Wikipedia

    en.wikipedia.org/?title=Central_vacuum_system&...

    Retrieved from "https://en.wikipedia.org/w/index.php?title=Central_vacuum_system&oldid=429092737"

  4. Exact solutions of classical central-force problems - Wikipedia

    en.wikipedia.org/wiki/Exact_solutions_of...

    In the classical central-force problem of classical mechanics, some potential energy functions () produce motions or orbits that can be expressed in terms of well-known functions, such as the trigonometric functions and elliptic functions. This article describes these functions and the corresponding solutions for the orbits.

  5. Vacuum sewer - Wikipedia

    en.wikipedia.org/wiki/Vacuum_sewer

    The main components of a vacuum sewer system are a collection chambers and vacuum valve parts, sewers, a central vacuum station and monitoring and control components. Some vacuum systems have vacuum toilets which are connected directly to a vacuum line, which requires less water for flushing (less than a quarter of a liter per flush). [4]

  6. Central vacuum cleaner - Wikipedia

    en.wikipedia.org/wiki/Central_vacuum_cleaner

    Cyclonic and filtered central vacuum systems are the two main types of central vacuums, differentiated by the method used to separate dirt and dust from the incoming airstream. [ 4 ] True cyclonic cleaners do not use filtration bags, instead separating the dirt and dust into a detachable cylindrical collection vessel or bin.

  7. List of unsolved problems in astronomy - Wikipedia

    en.wikipedia.org/wiki/List_of_unsolved_problems...

    This article is a list of notable unsolved problems in astronomy. Problems may be theoretical or experimental. Theoretical problems result from inability of current theories to explain observed phenomena or experimental results. Experimental problems result from inability to test or investigate a proposed theory.

  8. Steampunk - Wikipedia

    en.wikipedia.org/wiki/Steampunk

    In the 1996 American co-production, the TARDIS interior was re-designed to resemble an almost Victorian library with the central control console made up of an eclectic array of anachronistic objects. Modified and streamlined for the 2005 revival of the series, the TARDIS console continued to incorporate steampunk elements, including a Victorian ...

  9. List of vacuum tubes - Wikipedia

    en.wikipedia.org/wiki/List_of_vacuum_tubes

    Y – Vacuum half-wave rectifier (power diode) Z – Vacuum full-wave rectifier (dual power diode with common cathode) Following digits: model number and base type; For signal pentodes, an odd model number most often identified a variable-mu (remote-cutoff) tube, whereas an even number identified a 'high slope' (sharp-cutoff) tube