At least one full peak-peak or trough-trough cycle was assessed of each explant, though in the majority of cases two or more full cycles were used.
Period was assessed using peak-peak and trough-trough durations averaged over as many cycles as possible for each individual tissue explant, discounting the first 24 h of data.
This evidence includes glacial and glaciomarine related sedimentary and erosional features within the seismic units (glacial unconformities, glacial troughs, till wedges, prograded wedges, trough mouth fans, glaciomarine sheet deposits and moraines), which are bounded by glacial unconformities.
In the case of light whose wavelength is an exact submultiple of this distance, crest falls on crest, and trough on trough, reinforcing the colour.
By making an identical but inverted version of that wave and playing it through a loudspeaker, peak should fall on trough, and trough on peak.
But Thatcher has passed with her country sunk in a post-financial crisis trough — a trough that was part of Cool Britannia's legacy as surely as Cool Britannia was forged in the creative destruction, cultural and economic, that Thatcherism unleashed.
Usually, in transverse waves (waves with points oscillating at right angles to the direction of their advance), wavelength is measured from crest to crest or from trough to trough; in longitudinal waves (waves with points vibrating in the same direction as their advance), it is measured from compression to compression or from rarefaction to rarefaction.
They [the Kinnocks] haven't got their noses in the trough, they're in the trough".
Dr Copley, who will describe the expedition today at the British Association Festival of Science, at York University, also plans a journey to the deepest volcanic trough on Earth, the Cayman trough — a fissure between Jamaica and the Cayman Islands plunging to a depth of four miles.
