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  2. Trioctylphosphine oxide - Wikipedia

    en.wikipedia.org/wiki/Trioctylphosphine_oxide

    Trioctylphosphine oxide (TOPO) is an organophosphorus compound with the formula OP(C 8 H 17) 3. Frequently referred to as TOPO, this compound is used as an extraction or stabilizing agent. Frequently referred to as TOPO, this compound is used as an extraction or stabilizing agent.

  3. Ultrawide formats - Wikipedia

    en.wikipedia.org/wiki/Ultrawide_formats

    The 64:27 aspect ratio is the logical extension of the existing video aspect ratios 4:3 and 16:9. It is the third power of 4:3, whereas 16:9 of widescreen HDTV is 4:3 squared. This allows electronic scalers and optical anamorphic lenses to use an easily implementable 4:3 (1.3 3) scaling factor.

  4. Shuttle Radar Topography Mission - Wikipedia

    en.wikipedia.org/wiki/Shuttle_Radar_Topography...

    To acquire topographic data, the SRTM payload was outfitted with two radar antennas. [2] One antenna was located in the Shuttle's payload bay, the other – a critical change from the SIR-C/X-SAR, allowing single-pass interferometry – on the end of a 60-meter (200-foot) mast that extended from the payload bay once the Shuttle was in space. [ 2 ]

  5. 655th Engineer Topographic Battalion - Wikipedia

    en.wikipedia.org/wiki/655th_Engineer_Topographic...

    The Engineer Topographic Battalion's wartime mission was the development of accurate 4-color topographic maps created through timely survey work, drafting, printing, and distribution of military maps as required by the Allied Armed Forces of the United States. The Battalion was first formed in December 1943 and deactivated in December 1946.

  6. United States Army Corps of Topographical Engineers

    en.wikipedia.org/wiki/United_States_Army_Corps...

    In all, there were six major expeditions into the Louisiana Purchase, the first being the best known Corps of Discovery led by Lewis and Clark in 1804–1806. A second expedition in 1804 included astronomer and naturalist John Dunbar and prominent Philadelphia chemist William Hunter.

  7. Topographic map - Wikipedia

    en.wikipedia.org/wiki/Topographic_map

    Sergeant Chris D. Washington checking his Topographic map during a morning deer hunt in Kilgore, Texas A topographic map of Stowe, Vermont with contour lines Part of the same map in a perspective shaded relief view illustrating how the contour lines follow the terrain Sheet #535 (2013 version; second digital edition) of MTN50 Spanish National Topographic map series, covering Algete town (near ...