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SEADS Region shown in NORAD Region/Sector Configuration, 1987-2005 Historical map of Montgomery Air Defense Sector, 1957-1966. The Southeast Air Defense Sector (SEADS), was a unit of the US Air Force located at Tyndall Air Force Base near Panama City, Florida. It provided air defense and surveillance of the southeastern region of the US.
One solution of the nine dots puzzle. It is possible to mark off the nine dots in four lines. [13] To do so, one goes outside the confines of the square area defined by the nine dots themselves. The phrase thinking outside the box, used by management consultants in the 1970s and 1980s, is a restatement of the solution strategy. According to ...
Every two-wire or balanced transmission line has an implicit (or in some cases explicit) third wire which is called the shield, sheath, common, earth, or ground. So every two-wire balanced transmission line has two modes which are nominally called the differential mode and common mode. The circuit shown in the bottom diagram only can model the ...
2000-2010: First National Bank Alaska invests in technology, offering online banking services for consumers and businesses. The bank continues to grow, adding branches in Glennallen and Healy and a third in Fairbanks, the Johansen Branch. A new building for the Dimond Branch in South Anchorage is completed.
The a needle lies across a line, while the b needle does not. In probability theory, Buffon's needle problem is a question first posed in the 18th century by Georges-Louis Leclerc, Comte de Buffon: [1] Suppose we have a floor made of parallel strips of wood, each the same width, and we drop a needle onto the floor.
If a call is delivered to line 1, the next call goes to 2, the next to 3. The succession throughout each of the lines continues even if one of the previous lines becomes free. When the end of the hunt group is reached, the hunting starts over at the first line. Lines are skipped only if they are still busy on a previous call.
Utility pole with electric lines (top) and telephone cables. Fixed telephone lines per 100 inhabitants, 1997–2007. Cross section of telephone cable of 1,800 twisted pairs, 1922. A telephone line or telephone circuit (or just line or circuit industrywide) is a single-user circuit on a telephone communication system. [1]
The first field telephones had a battery to power the voice transmission, a hand-cranked generator to signal another field telephone or a manually-operated telephone exchange, and an electromagnetic ringer which sounded when current from a remote generator arrived. This technology was used from the 1910s to the 1980s.