Allan Scarfe (1931–2016)

Allan Frey

The intent of this paper is to bring a new phenomenon to the attention of physiologists. Using extremely low average power densities of electromagnetic energy, the perception of sounds was induced in normal and deaf humans. The effect was induced several hundred feet from the antenna the instant the transmitter was turned on, and is a function of carrier frequency and modulation. Attempts were ...

Kriging Allan

" Kriging " (after the South African mining engineer Danie Krige) is a term used for a family of methods for minimum error variance estimation. Consider a linear estimatê z 0 = ˆ z(r 0) at a location r 0 based on N measurements z = [z(r 1),. .. , z(r N)] T = [z 1 ,. .. , z N ] T ˆ z 0 = w 0 + N i=1 w i z i = w 0 + w T z, (1) where w i are the weights applied to z i. We consider z i as particula...

Nigel Allan An Appreciation

The retirement of Dr Nigel Allan from the Wellcome Library after twenty-six years as Curator of the Oriental Collections marks the end of an era. In 2004, a very successful exhibition of Asian treasures from the Wellcome Library’s collections, entitled ‘Asia: Body, Mind, Spirit’, was curated by Nigel Allan and a small team of assistants from other major London institutions including Asia House ...

Huygens ’ clocks revisited Allan

In 1665, Huygens observed that two identical pendulum clocks, weakly coupled through a heavy beam, soon synchronized with the same period and amplitude but with the two pendula swinging in opposite directions. This behaviour is now called anti-phase synchronization. This paper presents an analysis of the behaviour of a large class of coupled identical oscillators, including Huygens’ clocks, usi...

Allan Nevins on history