long period stacking structure
51Metamaterial — Negative index metamaterial array configuration, which was constructed of copper split ring resonators and wires mounted on interlocking sheets of fiberglass circuit board. The total array consists of 3 by 20×20 unit cells with overall dimensions …
52Escalator — For the album by Sam Gopal, see Escalator (album). Escalators in a Copenhagen Metro station, Denmark, 2007 Escalator in action, 2011 An e …
53Permaculture — The word permaculture, coined by Australians Bill Mollison and David Holmgren during the 1970s, is a portmanteau of permanent agriculture as well as permanent culture. Through a series of publications, Mollison, Holmgren and their associates… …
54Child development stages — See also: Parenting and Family Child development stages describe theoretical milestones of child development. Many stage models of development have been proposed, used as working concepts and in some cases asserted as nativist theories. This …
55airport — airport1 /air pawrt , pohrt /, n. a tract of land or water with facilities for the landing, takeoff, shelter, supply, and repair of aircraft, esp. one used for receiving or discharging passengers and cargo at regularly scheduled times. [1915 20;… …
56Magnetic resonance imaging — MRI redirects here. For other meanings of MRI or Mri, see MRI (disambiguation). Magnetic resonance imaging Intervention Sagittal MR image of the knee ICD 10 PCS B?3?ZZZ …
57Australian Christian Churches — Classification Protestant Orientation Pentecostal Associations World Assemblies of God Fellowship Geographical areas Australia Origin 1937 …
58Seacoast defense in the United States — Seacoast defense was a major concern for the United States from its independence until World War II. Before airplanes, America s enemies could only reach her from the sea, making coastal forts an economical alternative to standing armies or a… …
59Magnesium in biology — Magnesium is an essential element in biological systems. Magnesium occurs typically as the Mg2+ ion. It is an essential mineral nutrient for life[1][2][3] and is present in every cell type in every organism. For example, ATP (adenosine… …
6014th Street–Union Square (New York City Subway) — Infobox NYCS name = 14th Street–Union Square bg color = black passengers = 31.621 million pass year=2006 pass percent=5 service=Union Square borough = Manhattan14th Street–Union Square is a New York City Subway station complex shared by the IRT… …
