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  2. zSpace (company) - Wikipedia

    en.wikipedia.org/wiki/ZSpace_(company)

    zSpace is a technology firm based in San Jose, California that combines elements of virtual and augmented reality in a computer. zSpace mostly provides AR/VR technology to the education market. [1] It allows teachers and learners to interact with simulated objects in virtual environments .

  3. Central vacuum cleaner - Wikipedia

    en.wikipedia.org/wiki/Central_vacuum_cleaner

    Central vacuum cleaner. Central vacuum installed with an air inlet. Antique central vacuum inlet located in a dining room at Château Dufresne ( Canadian Register of Historic Places, c. 1918) Typical central vacuum cleaner power unit for residential use (North America) A central vacuum cleaner (also known as built-in or ducted) is a type of ...

  4. Outer space - Wikipedia

    en.wikipedia.org/wiki/Outer_space

    The boundary between space and Earth, at an altitude of 100 km, roughly where the yellow line of airglow is visible. Outer space (or simply space) is the expanse beyond celestial bodies and their atmospheres. It contains ultra-low levels of particle densities, constituting a near-perfect vacuum [1] of predominantly hydrogen and helium plasma ...

  5. Space Shuttle - Wikipedia

    en.wikipedia.org/wiki/Space_Shuttle

    The Space Shuttle is a retired, partially reusable low Earth orbital spacecraft system operated from 1981 to 2011 by the U.S. National Aeronautics and Space Administration (NASA) as part of the Space Shuttle program. Its official program name was Space Transportation System (STS), taken from a 1969 plan for a system of reusable spacecraft where ...

  6. Central vacuum system - Wikipedia

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

    Language links are at the top of the page. Search. Search

  7. State-space representation - Wikipedia

    en.wikipedia.org/wiki/State-space_representation

    State-space representation. In control engineering and system identification, a state-space representation is a mathematical model of a physical system specified as a set of input, output, and variables related by first-order differential equations or difference equations. Such variables, called state variables, evolve over time in a way that ...

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