Steven J. B. Carter

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CR-39 (allyl diglycol carbonate) dosimeters were tested for measurements of ultraviolet-B (erythemal dose) solar radiation with a rotating model head and a human survey during solar exposure. The ratio of summer dose to winter dose for the vertex is 3.3, and for the eye and lower face is greater than 1. A survey suggests the relation of the ultraviolet-B(More)
Identifying land-use drivers of changes in river condition is complicated by spatial scale, geomorphological context, land management, and correlations among responding variables such as nutrients and sediments. Furthermore, variations in standard metrics, such as substratum composition, do not necessarily relate causally to ecological impacts.(More)
The impedance characteristics of gold-plated indium-tin-oxide microelectrodes immersed in culture medium (MEM) are described and compared with the impedance characteristics observed when those microelectrodes are immersed in isotonic saline. For microelectrode areas of approximately 100 microns2, applied voltage levels of 5, 50, and 100 mV, and for(More)
A theoretical method is developed to treat wideband pulsed squeezing in a traveling-wave parametric amplifier with group-velocity dispersion. Classical stochastic wave equations that are fully equivalent to operator equations of motion are developed and solved numerically. It is found that squeezing occurs over the entire phase-matching bandwidth, although(More)
We present results from both theoretical and experimental studies of the noise characteristics of mode-locked superfluorescent lasers. The results show that observed macroscopic broadband amplitude noise on the laser pulse train has its origin in quantum noise-initiated “phase-wave” fluctuations, and we find an associated phase transition in the noise(More)
We have used the University of Tasmania’s 30-m radio telescope at Ceduna in South Australia to regularly monitor the flux density of a number of southern blazars. We report the detection of an annual cycle in the variability timescale of the centimetre radio emission of PKSB1622–253. Observations of PKSB1519–273 over a period of nearly two years confirm the(More)
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