J. A. Harrison
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View article: Long-distance soliton transmission through ultralong fiber lasers
Long-distance soliton transmission through ultralong fiber lasers Open
We present the first experimental demonstration (to our knowledge) of long-distance unperturbed fundamental optical soliton transmission in conventional single-mode optical fiber. The virtual transparency in the fiber required for soliton …
View article: The seminal legacy of the Southern African Bird Atlas Project
The seminal legacy of the Southern African Bird Atlas Project Open
The first Southern African Bird Atlas Project was launched in 1986 and gathered bird distribution data from six countries of southern Africa. The project culminated with the publication of The Atlas of Southern African Birds in 1997. The d…
View article: All-optical processing using cross-phase modulation
All-optical processing using cross-phase modulation Open
The following thesis presents results obtained from both numerical simulation and laboratory experimentation (both of which were carried out by the author). When data is propagated along an optical transmission line some timing irregularit…
View article: Atlas and Red Data book for frogs completed : news and views
Atlas and Red Data book for frogs completed : news and views Open
AN ATLAS AND RED DATA BOOK OF THE FROGS of South Africa, Lesotho and Swaziland has been published as the culmination, after nine years, of the Southern African Frog Atlas Project (SAFAP). The book presents analyses of a database, containin…
View article: Aerial colonization of high Arctic islands by invertebrates: the diamondback moth <i>Plutella xylostella</i> (Lepidoptera: Yponomeutidae) as a potential indicator species
Aerial colonization of high Arctic islands by invertebrates: the diamondback moth <i>Plutella xylostella</i> (Lepidoptera: Yponomeutidae) as a potential indicator species Open
The restricted animal communities of the high Arctic islands are due, in part, to extreme geographical isolation. Migration via wind currents is one mechanism by which invasion of new species may occur. Here, we describe immigration of the…
View article: Survival of terrestrial soil‐dwelling arthropods on and in seawater: implications for trans‐oceanic dispersal
Survival of terrestrial soil‐dwelling arthropods on and in seawater: implications for trans‐oceanic dispersal Open
Summary 1. The ability of six species of high Arctic soil arthropod to survive oceanic transport in or on sea water was tested experimentally. 2. Five species of Collembola, Hypogastrura tullbergi (Schäffer), Onychiurus groenlandicus (Tull…
View article: Seasonal patterns of occurrence of Palaearctic migrants in southern Africa using atlas data
Seasonal patterns of occurrence of Palaearctic migrants in southern Africa using atlas data Open
A statistical method, using presence/absence data from monthly fieldcards, to describe the phenology of migration is developed. The method uses the generalized linear model to fit a Fourier series to binomial‐type data giving the proportio…