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transoceanic communications

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  • Submarine communications cable — A cross section of a submarine communications cable. 1 Polyethylene 2 Mylar tape 3 Stranded steel wires 4 Aluminium water barrier 5 Polycarbonate 6 Copper or aluminium tube 7 Petroleum jelly 8 Optical fib …   Wikipedia

  • Contesting — Champions of the 2002 World Radiosport Team Championship (WRTC), Helsinki, Finland. Photo: R. A. Wilson, N6TV Contesting (also known as radiosport) is a competitive activity pursued by amateur radio operators. In a contest, an amateur radio… …   Wikipedia

  • Harold Beverage — Infobox Scientist name = Harold Beverage caption = birth date = 14 October 1893 birth place = North Haven, ME death date = 27 January 1993 death place = Port Jefferson, NY residence = Stony Brook, NY nationality = American field = Electrical… …   Wikipedia

  • Shortwave — radio operates between the frequencies of 3,000 kHz (3.000 MHz) and 30,000 kHz (30.000 MHz) [ Tomislav Stimac, [http://www.vlf.it/frequency/bands.html Definition of frequency bands (VLF, ELF... etc.)] . IK1QFK Home Page (vlf.it).] and came to be… …   Wikipedia

  • Shortwave radio — Shortwave can also refer to a shortwave trough meteorology. A solid state, analog shortwave receiver Shortwave radio refers to the upper MF (medium frequency) and all of the HF (high frequency) portion of the radio spectrum, between… …   Wikipedia

  • Flight controller — Flight controllers are personnel who aid in the operations of a space flight, working in Mission Control Centers such as NASA s Mission Control Center, or ESA s Operations Center. Flight controllers sit at computer consoles and use telemetry to… …   Wikipedia

  • materials science — the study of the characteristics and uses of various materials, as glass, plastics, and metals. [1960 65] * * * Study of the properties of solid materials and how those properties are determined by the material s composition and structure, both… …   Universalium

  • Magnetic amplifier — The magnetic amplifier (colloquially known as a mag amp ) is an electromagnetic device for amplifying electrical signals. The magnetic amplifier was invented early in the 20th century, and was used as an alternative to vacuum tube amplifiers… …   Wikipedia

  • Magnetic amplifiers (history) — The magnetic amplifier (sometimes called a self saturated amplifier ) is a magnetic device consisting of a saturable reactor (transformer) modulated by a direct current. This DC current is introduced in the primary winding of an iron core… …   Wikipedia

  • Bibliography —    As the scope of the dictionary entries and extent of this bibliography make clear, there is a huge range of literature on shamans, from introductory works, general discussions on such topics as definition, and culture specific ethnographic… …   Historical dictionary of shamanism

  • United Steelworkers — Infobox Union name= USW country= United States, Canada affiliation= AFL CIO, CLC members= 1.2 million (2006) full name= United Steelworkers native name= founded= May 22, 1942 current= head= dissolved date= dissolved state= merged into= office=… …   Wikipedia

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