Total electron content over the Pan-American longitudes: March-April 1994
نویسندگان
چکیده
منابع مشابه
AMERICAN SCIENTIST The Science of Computing 1992 - 2 ( March - April )
In 1960, the year of the first time-sharing systems, we crossed a divide in the history of computing. Time-sharing systems were the first to allow multiple users interactive access to their files in the same memory system. They were the first to allow users to specify who else could read and write their files. The password was invented as a means of identifying users to the system so that acces...
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ژورنال
عنوان ژورنال: Radio Science
سال: 1997
ISSN: 0048-6604
DOI: 10.1029/97rs00840