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  2. Symmetry-protected topological order - Wikipedia

    en.wikipedia.org/wiki/Symmetry-protected...

    Symmetry-protected topological (SPT) order [1] [2] is a kind of order in zero-temperature quantum-mechanical states of matter that have a symmetry and a finite energy gap.. To derive the results in a most-invariant way, renormalization group methods are used (leading to equivalence classes corresponding to certain fixed points). [1]

  3. Standard penetration test - Wikipedia

    en.wikipedia.org/wiki/Standard_penetration_test

    The standard penetration test (SPT) is an in-situ dynamic penetration test designed to provide information on the geotechnical engineering properties of soil. This test is the most frequently used subsurface exploration drilling test performed worldwide. The test procedure is described in ISO 22476-3, ASTM D1586 [1] and Australian Standards AS ...

  4. List of Colt AR-15 and M16 rifle variants - Wikipedia

    en.wikipedia.org/wiki/List_of_Colt_AR-15_and_M16...

    1:12 No Type 2 Duckbill 605B Model 605B: A1 Triangular S-F-1-3 A1 No No .223 REM 15 in. A1 1:12 No Type 2 Duckbill 606 CAR-15 Heavy Assault Rifle M1: A1 Triangular S-1-F A1 No No .223 REM 20 in. HBAR 1:12 Yes Type 2 Duckbill 606A CAR-15 Heavy Assault Rifle M1: A1 Triangular S-1-F A1 Yes No .223 REM 20 in. HBAR 1:12 Yes Type 2 Duckbill 606B

  5. Honda RC51 - Wikipedia

    en.wikipedia.org/wiki/Honda_RC51

    The RC51 was designed as the motorcycle to be used by Honda's racing teams in the Superbike World Championship. [5] The 2000–2001 models are designated SP1, while the 2002–2006 models are designated SP2 (the latter having updated fuel injection and suspension systems).

  6. Service pack - Wikipedia

    en.wikipedia.org/wiki/Service_pack

    Service packs are usually numbered, and thus shortly referred to as SP1, SP2, SP3 etc. [1] They may also bring, besides bug fixes, [2] entirely new features, as is the case of SP2 of Windows XP (e.g. Windows Security Center), or SP3 and SP4 of the heavily database dependent Trainz 2009: World Builder Edition. [3]

  7. 6.8mm Remington SPC - Wikipedia

    en.wikipedia.org/wiki/6.8mm_Remington_SPC

    The 6.8mm Remington Special Purpose Cartridge (6.8 SPC, 6.8 SPC II or 6.8×43mm) is a rimless bottlenecked intermediate rifle cartridge that was developed by Remington Arms in collaboration with members of the U.S. Army Marksmanship Unit and United States Special Operations Command [6] to possibly replace the 5.56 NATO cartridge in short barreled rifles (SBR) and carbines.

  8. Cone penetration test - Wikipedia

    en.wikipedia.org/wiki/Cone_penetration_test

    The test method consists of pushing an instrumented cone, with the tip facing down, into the ground at a controlled rate (controlled between 1.5 -2.5 cm/s accepted). The resolution of the CPT in delineating stratigraphic layers is related to the size of the cone tip, with typical cone tips having a cross-sectional area of either 10 or 15 cm 2 ...

  9. Sodium metatungstate - Wikipedia

    en.wikipedia.org/wiki/Sodium_metatungstate

    Metatungstates feature the doubly protonated derivative of this cage, i.e. [H 2 W 12 O 40] 6-. [1] Sodium metatungstate is the inorganic compound with the formula Na 6 [H 2 W 12 O 40], sometimes written 3Na 2 WO 4 ·9WO 3 ·H 2 O. It is also referred to as sodium polytungstate (SPT). This salt has been used in the manufacture of dense aqueous ...