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Book Proceedings of the Thirteenth Annual Precise Time and Time Interval  PTTI  Applications and Planning Meeting     Held at the Naval Research Laboratory  Washington  D C   December 1   3  1981

Download or read book Proceedings of the Thirteenth Annual Precise Time and Time Interval PTTI Applications and Planning Meeting Held at the Naval Research Laboratory Washington D C December 1 3 1981 written by Goddard Space Flight Center and published by . This book was released on 1982 with total page 864 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Proceedings of the Annual Precise Time and Time Interval  PTTI  Applications and Planning Meeting  22nd  Held in Vienna  Virginia on 4 6 Dec 1990

Download or read book Proceedings of the Annual Precise Time and Time Interval PTTI Applications and Planning Meeting 22nd Held in Vienna Virginia on 4 6 Dec 1990 written by and published by . This book was released on 1991 with total page 618 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first successful magnetic resonance experiments were those of Rabi and his associates with molecular beams in 1938. The initial experiments measured the interactions of nuclear magnetic moments with external magnetic fields, but radiofrequency spectra were soon observed that depended on internal interactions within molecules atoms. Some of the radiofrequency spectra lines were almost independent of external conditions and could therefore be used as the highly stable periodic component of an atomic clock. At present different atomic clocks can be chosen to fit the need. When high stability is not required, optically pumped rubidium cells can be chosen for their low cost, small size and light weight; such cells are stable to 10-11 over a one month period and more stable for shorter periods. When greater accuracy and stability is required, cesium beam tubes are usually used; they are accurate to better than 10-13 over extended time periods. For the highest stability requirements, as in long baseline radio astronomy and navigation in outer space, hydrogen masers are often required; they are stable to better than 10-15 over several hours. When optical frequencies need to be measured lasers must be used even though they are not yet absolute standards.

Book 28th Annual Precise Time and Time Interval  PTTI  Applications and Planning Meeting

Download or read book 28th Annual Precise Time and Time Interval PTTI Applications and Planning Meeting written by Precise Time and Time Interval (PTTI) Applications and Planning Meeting and published by . This book was released on 1997 with total page 499 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Proceedings of the Annual Precise Time and Time Interval  PTTI  Applications and Planning Meeting  21st   Held in Redondo Beach  California on November 28 30  1989

Download or read book Proceedings of the Annual Precise Time and Time Interval PTTI Applications and Planning Meeting 21st Held in Redondo Beach California on November 28 30 1989 written by and published by . This book was released on 1989 with total page 556 pages. Available in PDF, EPUB and Kindle. Book excerpt: These Proceedings contain the papers presented at the Twenty First Annual Precision Time and Time Interval Applications and Planning Meeting. Contents: Specification and Procurement and Frequency and Timing Equipment and Systems; Time Synchronization, Methods, and Performance; Personal Interaction and Discussion Poster Session; Analysis and Calibration; New Technology and Results; Timing Systems and Equipment of Today and Tomorrow.