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A portal is an opening in the walls of a building, gate or fortification, and especially a grand entrance to an important structure. 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 with ornamentation.
Delta Force's founder Charles Beckwith in 1980. Delta Force bodyguards lead by Mike Vining in civilian clothing providing close protection to General Norman Schwarzkopf during the Gulf War, 1991. Delta Force was created in 1977 after numerous well-publicized terrorist incidents led the U.S. government to develop a full-time counter-terrorism unit.
Delta Zeta (ΔΖ, also known as DZ) is an international college sorority founded on October 24, 1902, at Miami University in Oxford, Ohio.. Delta Zeta has 170 collegiate chapters in the United States and Canada, and over 200 alumnae chapters in Canada, the United Kingdom, and the United States.
The symbols Δt and ΔT (spoken as "delta T") are commonly used in a variety of contexts. Time [ edit ] ΔT (timekeeping) the difference between two time scales, Universal Time and Terrestrial Time, which results from a drift in the length of a day
The generalized Kronecker delta or multi-index Kronecker delta of order is a type (,) tensor that is completely antisymmetric in its upper indices, and also in its lower indices. Two definitions that differ by a factor of p ! {\displaystyle p!} are in use.
The Delta rocket family was a versatile range of American rocket -powered expendable launch systems that provided space launch capability in the United States from 1960 to 2024. Japan also launched license-built derivatives ( N-I, N-II, and H-I) from 1975 to 1992. More than 300 Delta rockets were launched with a 95% success rate.
History of Delta Air Lines. Delta Air Lines is a major American airline. [1] [2] The company's history began with the world's first aerial crop dusting operation called Huff Daland Dusters Inc., founded in 1925 in Macon, Georgia [3] to combat the boll weevil infestation of cotton crops. [4] C.E. Woolman, general manager and later Delta's first ...
Delta Centauri, Latinized from δ Centauri, is a star in the southern constellation of Centaurus. The apparent visual magnitude of this star is +2.57, [2] making it readily visible to the naked eye. Based upon parallax measurements, it is located at a distance of about 410 light-years (130 parsecs ) from the Earth . [1]