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  2. Emergency service response codes - Wikipedia

    en.wikipedia.org/wiki/Emergency_service_response...

    In this example, to "reduce code" would mean to continue responding, but at Code 2 or Code 1, rather than discontinue altogether. Some emergency medical services use "Priority" instead: Priority 1: Dead on arrival Trauma/CPR; Priority 2: Emergency; Priority 3: Non-Emergency; Priority 4: Situation Under Control; Priority 5: Mass-casualty incident

  3. Cuprate superconductor - Wikipedia

    en.wikipedia.org/wiki/Cuprate_superconductor

    Cuprate superconductors usually feature copper oxides in both the oxidation states 3+ and 2+. For example, YBa 2 Cu 3 O 7 is described as Y 3+ (Ba 2+) 2 (Cu 3+)(Cu 2+) 2 (O 2−) 7. The copper 2+ and 3+ ions tend to arrange themselves in a checkerboard pattern, a phenomenon known as charge ordering.

  4. List of ISO 3166 country codes - Wikipedia

    en.wikipedia.org/wiki/List_of_ISO_3166_country_codes

    The sortable table below contains the three sets of ISO 3166-1 country codes for each of its 249 countries, links to the ISO 3166-2 country subdivision codes, and the Internet country code top-level domains (ccTLD) which are based on the ISO 3166-1 alpha-2 standard with the few exceptions noted.

  5. Fraction - Wikipedia

    en.wikipedia.org/wiki/Fraction

    The fraction bar may be horizontal (as in ⁠ 1 / 3 ⁠), oblique (as in 2/5), or diagonal (as in 4 ⁄ 9). [4] These marks are respectively known as the horizontal bar; the virgule, slash , or stroke ; and the fraction bar, solidus, [5] or fraction slash.

  6. Quark - Wikipedia

    en.wikipedia.org/wiki/Quark

    A proton is composed of two up quarks, one down quark, and the gluons that mediate the forces "binding" them together. The color assignment of individual quarks is arbitrary, but all three colors must be present; red, blue and green are used as an analogy to the primary colors that together produce a white color.

  7. List of Egyptian inventions and discoveries - Wikipedia

    en.wikipedia.org/wiki/List_of_Egyptian...

    [103] [104] The Rhind Papyrus, dated around 1650 BC but copied from a document dated to 1850 BC, has a formula for the area of a circle that treats π as (⁠ 16 / 9 ⁠) 23.16. The Golden number: [105] Arithmetic progression: Rhind Mathematical Papyrus problem number 40. [106] Pefsu problem (modern day: Arithmetic mean and Arithmetic ...

  8. Cohn process - Wikipedia

    en.wikipedia.org/wiki/Cohn_process

    The conditions of the earlier stages are 8% ethanol, pH 7.2, −3 °C, and 5.1% protein for Fraction I; 25% ethanol, pH of 6.9, −5 °C, and 3% protein. The albumin remains in the supernatant fraction during the solid/liquid separation under these conditions. Fraction IV has several unwanted proteins that need to be removed.

  9. Three-fifths Compromise - Wikipedia

    en.wikipedia.org/wiki/Three-Fifths_Compromise

    In the U.S. Constitution, the Three-fifths Compromise is part of Article 1, Section 2, Clause 3: . Representatives and direct Taxes shall be apportioned among the several States which may be included within this Union, according to their respective Numbers, which shall be determined by adding to the whole Number of free Persons, including those bound to Service for a Term of Years, and ...