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Login. In computer security, logging in (or logging on, signing in, or signing on) is the process by which an individual gains access to a computer system or program by identifying and authenticating themselves. The user credentials are typically some form of a username and a password, [1] and these credentials themselves are sometimes referred ...
is the longest-lived with a half-life of 3.8 minutes. Isotopes with a mass number above 64 decay by β −, whereas those with a mass number below 64 decay by β +. 64 Cu, which has a half-life of 12.7 hours, decays both ways. 62 Cu and 64 Cu have significant applications. 62 Cu is used in 62 Cu Cu-PTSM as a radioactive tracer for positron ...
A web page from Wikipedia displayed in Google Chrome. The World Wide Web (WWW or simply the Web) is an information system that enables content sharing over the Internet through user-friendly ways meant to appeal to users beyond IT specialists and hobbyists.
Isotope-ratio mass spectrometry ( IRMS) is a specialization of mass spectrometry, in which mass spectrometric methods are used to measure the relative abundance of isotopes in a given sample. [1] [2] This technique has two different applications in the earth and environmental sciences. The analysis of ' stable isotopes ' is normally concerned ...
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The Space Shuttle is a retired, partially reusable low Earth orbital spacecraft system operated from 1981 to 2011 by the U.S. National Aeronautics and Space Administration (NASA) as part of the Space Shuttle program. Its official program name was Space Transportation System (STS), taken from a 1969 plan for a system of reusable spacecraft where ...
Joseph Leonard Bonamassa (/ ˌ b ɑː n ə ˈ m ɑː s ə / BAH-nə-MAH-sə; born May 8, 1977) is an American blues rock guitarist, singer and songwriter. He started his career at age twelve, when he opened for B.B. King.
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