Read e-book online Frequency Measurement and Control (Microwave and RF PDF

By Chronos Group

Periodical phenomena or, extra accurately, quasiperiodical phenomena, occupy a crucial place in physics. for a very long time, their most crucial parameter has been their interval. despite the fact that, these days, we're even more attracted to their frequency, and the various purposes for this are mentioned during this publication. all through historical past, reviews of time were according to periodical phenomena comparable to the obvious movement of the solar. certainly, the oldest unit of time is the day. the plain movement of the Moon and of the celestial sphere, together with alterations within the visual appeal of the previous, supplied longer devices, particularly, week, month and yr. a majority of these periodical phenomen- the average clocks - have been evidently compatible to the statement and prediction of the evolution of nature with its seasonal rhythm. The gnomon and the clepsydra gave kind of certain subdivisions of the day that may be utilized in timing human actions, as long as they have been typically agricultural. the discovery of the pendulum and of stability­ wheel clocks marked the sunrise of business civilisation, which quickly de­ manded measurements of time with ever expanding precision over shorter and shorter periods.

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Frequency Measurement and Control (Microwave and RF Techniques and Applications) by Chronos Group


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