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The area code was created in a split of area code 515 on July 9, 2000, which was the first split in Iowa since the establishment of the area code system in 1947. In 2006, various companies began using Iowa's 641 as a number to access voice over IP gateways, including one which purported to allow users to "call China for free". [ 1 ]
A refrigerator designed to reach cryogenic temperatures (below 120 K, -153 °C, -243.4 °F) is often called a cryocooler.The term is most often used for smaller systems, typically table-top size, with input powers less than about 20 kW.
319: Cedar Rapids, Waterloo, Iowa City, and Cedar Falls (original area code created in 1947) 515: Des Moines, Ames, West Des Moines, Urbandale and Fort Dodge (original area code created in 1947) 563: Davenport, Dubuque, Bettendorf, Clinton, Muscatine (split from 319 in 2001) 641: Mason City, Marshalltown, Ottumwa, Tama (split from 515 in 2000)
SunPower Corporation is an American provider of photovoltaic solar energy generation systems and battery energy storage products, primarily for residential customers. The company, headquartered in San Jose, California , was founded in 1985 by Richard Swanson , an electrical engineering professor from Stanford University .
Pages in category "Area codes in Iowa" ... Area code 641; Area code 712 ... Contact Wikipedia; Code of Conduct; Developers; Statistics;
He founded Sunpower Inc., [35] which researches and develops FPSC systems for military, aerospace, industrial, and commercial applications. A FPSC cooler made by Sunpower was used by NASA to cool instrumentation in satellites. [36] The firm was sold by the Beale family in 2015 to become a unit of Ametek. [37]
Pulse tube cryocoolers are used in niche industrial applications such as semiconductor fabrication and superconducting radio-frequency circuits. [1] They are also used in military applications such as for the cooling of infrared sensors. [2] In research, PTRs are often used as precoolers of dilution refrigerators.
Swanson was born in Davenport, Iowa in 1945. [1]He graduated in 1969 with Bachelor of Engineering and Master of Engineering degrees from Ohio State University and, in 1975, received a Doctor of Philosophy in electrical engineering from Stanford University. [1]