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NaK
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NaK
NaK, or sodium-potassium alloy (commonly pronounced 'knack') , an alloy of potassium (K) and sodium (Na), is usually liquid at room temperature. Various commercial grades are available. NaK is highly reactive with water and may catch fire when exposed to air, so must be handled with special precautions.
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Negative-acknowledge character
- In telecommunications, a negative-acknowledge character (NAK or NACK) is a transmission control character sent by a station as a negative response to the station with which the connection has been set up.
- In Binary Synchronous Communications protocol, the NAK is used to indicate that a transmission error was detected in the previously received block and that the receiver is ready to accept retransmission of that block.
- In multipoint systems, the NAK is used as the not-ready reply to a poll.
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Takenoshin Nakai
was a Japanese botanist. In 1919 and 1930 he published papers on the plants of Japan and Korea, including the genus Cephalotaxus.
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