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  2. Portal frame - Wikipedia

    en.wikipedia.org/wiki/Portal_frame

    A portal frame steel building under construction. Portal frame is a construction technique where vertical supports are connected to horizontal beams or trusses via fixed joints with designed-in moment-resisting capacity. The result is wide spans and open floors. Portal frame structures can be constructed using a variety of materials and methods.

  3. Time portal - Wikipedia

    en.wikipedia.org/wiki/Time_portal

    Time portal. Time portals are doorways in time, employed in various fiction genres, especially science fiction and fantasy, to transport characters to the past or future . They differ from time machines in being a permanent or semi-permanent fixture linking specific points in time, and thus are an especially useful plot device when the plot ...

  4. List of time travel works of fiction - Wikipedia

    en.wikipedia.org/wiki/List_of_time_travel_works...

    A disastrous experiment in 1993 sends a stealth aircraft through a time portal into 1943 Germany. A sailor is pulled into the portal at the same time, and finds himself in a version of 1993 where the Nazis won World War II. 1993 12:01 PM: Jack Sholder: Barry Thomas is an average office worker who witnesses the murder of a woman that he is ...

  5. Steel frame - Wikipedia

    en.wikipedia.org/wiki/Steel_frame

    Steel frame is a building technique with a " skeleton frame" of vertical steel columns and horizontal I-beams, constructed in a rectangular grid to support the floors, roof and walls of a building which are all attached to the frame. The development of this technique made the construction of the skyscraper possible. [1]

  6. Time and materials - Wikipedia

    en.wikipedia.org/wiki/Time_and_materials

    Time and materials ( T&M) is a standard phrase in a contract for construction, product development or any other piece of work in which the employer agrees to pay the contractor based upon the time spent by the contractor's employees and subcontractors employees to perform the work, and for materials used in the construction (plus the contractor ...

  7. Independent contracting in the United States - Wikipedia

    en.wikipedia.org/wiki/Independent_contracting_in...

    The distinction between independent contractor and employee is an important one in the United States, as the costs for business owners to maintain employees are significantly higher than the costs associated with hiring independent contractors, due to federal and state requirements for employers to pay FICA (Social Security and Medicare taxes) and unemployment taxes on received income for ...

  8. Portal (architecture) - Wikipedia

    en.wikipedia.org/wiki/Portal_(architecture)

    Portal (architecture) A portal is an opening in a wall of a building, gate or fortification, especially a grand entrance to an important structure. [1] [page needed] Doors, metal gates, or portcullis in the opening can be used to control entry or exit. The surface surrounding the opening may be made of simple building materials or decorated ...

  9. Performance-based contracting - Wikipedia

    en.wikipedia.org/wiki/Performance-based_contracting

    Performance based contracting ( PBC ), also known as performance-based logistics ( PBL) or performance-based acquisition, is a product and services purchasing strategy used to achieve measurable supplier performance. A PBC approach focuses on developing strategic performance metrics and directly relating contracting payment to performance ...

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