Sentences with phrase «apparent by the frequency»

Not exact matches

The earliest definitions of time and time - interval quantities were based on observed astronomical phenomena, such as apparent solar or lunar time, and as such, time as measured by clocks, and frequency, as measured by devices were derived quantities.

By aiming at the atoms from opposite directions simultaneously, the laser arrangement cancels a major source of measurement error — the Doppler shift, or the change in the atoms» apparent resonant frequency as they interact and move with the laser light.

Data were aggregated by county Significant clusters of practices with a high probability of seeing confirmed cases were identified Cluster maps were produced to illustrate cluster locations and level of significance of each cluster Results: 35.9 % questionnaire return rate (1419) Of these 31.3 % were aware of A. vasorum occurring within a 5 mile radius > 20 % practices reported at least 1 confirmed case in the preceding 12 months Two significant clusters of practices reporting at least 1 confirmed case: one in south - east England, second in Wales Relative risk of practices having at least 1 confirmed case: 4.42 in England, 4.95 in Wales They acknowledge that «practices that had seen cases might have been more likely to respond to the survey, thereby increasing the apparent frequency of cases in regions where canine angiostrongylosis had been diagnosed».

But this apparent limit has, they report, been surpassed during recent decades, characterised by «exceptionally high fire frequency and biomass burning.»