NaK (rhyming with "sack") is an alloy of sodium (Na) and potassium (K), and particularly one that is liquid at room temperatures. It is a commercially available material in various grades. NaK is highly reactive with air or water, and must be handled with special precautions. Quantities as small as one gram can be a fire or explosion risk.
The Soviet RORSAT radar satellites were powered by a NaK-cooled reactor. Apart from the wide liquid temperature range, NaK has a very low vapor pressure, important in the vacuum of space. Some of the coolant has leaked and these NaK droplets constitute a significant space debris hazard.
Patent Application Titled "Method and Apparatus for ACK/ NAK Transmission in a Time Division Duplex Wireless System" under Review
Jan 09, 2013; By a News Reporter-Staff News Editor at Telecommunications Weekly -- According to news reporting originating from Washington,...
US Patent Issued to LG Electronics on Jan. 8 for "Method for Transmitting/ receiving ACK/ NAK Signal in an OFDM Communication System" (South Korean Inventors)
Jan 11, 2013; ALEXANDRIA, Va., Jan. 11 -- United States Patent no. 8,351,387, issued on Jan. 8, was assigned to LG Electronics Inc. (Seoul,...