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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)
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.
They can go as low as 40–60 K for single-stage machines, depending on the particular design. Two-stage Stirling cryocoolers can reach temperatures of 20 K, sufficient to liquify hydrogen and neon. [32] Cryocoolers for this purpose are more or less competitive with other cryocooler technologies.
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.
Area code 641 is a telephone area code in the North American Numbering Plan (NANP) for the central region of the U.S. state of Iowa. The numbering plan area (NPA) includes Mason City, and Ottumwa. 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 ...
Area code 319 is a telephone area code in the North American Numbering Plan (NANP) for the southeastern and east-central parts of the U.S. state of Iowa. Major cities in the numbering plan area (NPA) include Burlington , Cedar Falls , Cedar Rapids , Oelwein , Fort Madison , Iowa City , Keokuk , Mount Pleasant , and Waterloo .
Area code 712 was one of the original three area codes for the state of Iowa established in 1947. It is the only area code in the state, is one of the few remaining original area codes nationwide (not counting those covering an entire state) that has never been split or overlaid. Despite the proliferation of cell phones and pagers (particularly ...
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 .
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