technical replacement factor
71Iran — /i ran , i rahn , uy ran /, n. a republic in SW Asia. 67,540,002; ab. 635,000 sq. mi. (1,644,650 sq. km). Cap.: Teheran. Formerly (until 1935), Persia. * * * Iran Introduction Iran Background: Known as Persia until 1935, Iran became an Islamic… …
72iPod — The current iPod line; from left to right: iPod Shuffle, iPod Nano, iPod Classic, iPod Touch …
73Solar power satellite — A solar power satellite, or SPS or Powersat, as originally proposed would be a satellite built in high Earth orbit that uses microwave power transmission to beam solar power to a very large antenna on Earth. Advantages of placing the solar… …
74Nuclear weapon design — The first nuclear weapons, though large, cumbersome and inefficient, provided the basic design building blocks of all future weapons. Here the Gadget device is prepared for the first nuclear test: Trinity. Nuclear weapon designs are physical,… …
75Dalek variants — …
76motion picture — motion picture, adj. 1. a sequence of consecutive pictures of objects photographed in motion by a specially designed camera (motion picture camera) and thrown on a screen by a projector (motion picture projector) in such rapid succession as to… …
77environmental works — ▪ civil engineering Introduction infrastructure that provides cities and towns with water supply, waste disposal, and pollution control services. They include extensive networks of reservoirs, pipelines, treatment systems, pumping stations …
78Western architecture — Introduction history of Western architecture from prehistoric Mediterranean cultures to the present. The history of Western architecture is marked by a series of new solutions to structural problems. During the period from the… …
79X-ray crystallography — can locate every atom in a zeolite, an aluminosilicate with many important applications, such as water purification. X ray crystallography is a method of determining the arrangement of atoms within a crystal, in which a beam of X rays strikes a… …
80Ballistic vest — A ballistic vest is an item of protective clothing that absorbs the impact from gun fired projectiles and shrapnel fragments from explosion. This protection is for the torso. Soft vests are made from many layers of woven or laminated fibers and… …
