Synchronization and relativity

Article Abstract:

High-precision synchronization over extended distances requires time measurement corrections that allow for metric effects related to the relative speed and gravitational differences between the linked locations. The Theory of Relativity predicts these effects. The Special Theory of Relativity (SR) concerns the transformations needed to relate measurements between two systems that move relative to each other at constant velocity. The General Theory of Relativity (GR) includes all possible motions in the transformations, including the effects of gravity. The concepts and formulae of both theories are necessary in electronic systems using high precision timing, especially space systems.

Standard, Standardization, Electronics, Technical, Space Exploration, Timing, Theory, Synchronization

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A struggle for recognition

Article Abstract:

Midwives do not have legal status in Canada, although there is a movement to treat them as professionals. Obstacles include debates over which procedures midwives are allowed to perform and whether they will allow women to choose where to have their babies.

Canada, Laws, regulations and rules, Social policy, Midwives, Professions

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Computerease

Article Abstract:

Seventeen IBM and Macintosh-compatible software packages are evaluated. The programs are either spreadsheets or databases that allow runners to keep detailed logs of their training schedules. The software packages range in price from $8 to $69.95.

Evaluation, Software, Running, The Athlete's Diary (Computer program), The Athlete's Log (Computer program), Compu-Run (Computer program), Fitness Tracker (Computer program), Fitz (Computer program), Improve (Computer program), MacRun (Computer program), PC Athlete's Log (Computer program), Run-Log/Sportsdesk (Computer program), Runner's Package (Computer program), Running Counts (Computer program), Running Log (Computer program), Running Log for Lotus 1-2-3 (Computer program ), The Running Record (Computer program), Runningware (Computer program), Stretching (Computer program), UltraCoach (Computer program)

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