Robert H. Courtney

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Foreword The Electronic Supervisor: New Technology, New Tensions, deals with the use of computer-based technologies to measure how fast or how accurately employees work. New computer-based office systems are giving employers new ways to supervise job performance and control employees' use of telephones, but such systems are also controversial because they(More)
Concern for the safety of a data processing facility and the data within it should result in the selection of such security measures, including insurance, as are appropriate to bringing the risk within tolerable limits at the lowest cost. These security measures should be selected on the basis of the benefit/cost relationships which they afford. This, in(More)
The data set of proxies of past climate used in Mann, Bradley and Hughes (1998, " MBH98 " hereafter) for the estimation of temperatures from 1400 to 1980 contains collation errors, unjustifiable truncation or extrapolation of source data, obsolete data, geographical location errors, incorrect calculation of principal components and other quality control(More)
The data set of proxies of past climate used in Mann, Bradley and Hughes (1998, " MBH98 " hereafter) for the estimation of temperatures from 1400 to 1980 contains collation errors, unjustifiable truncation or extrapolation of source data, obsolete data, geographical location errors, incorrect calculation of principal components and other quality control(More)
A latina nr mordens have been located in large predictable spawning aggregations near Osprey Reef in the Coral Sea eight to ten days after a full moon; however, polyps have never been located in-situ. The polyp stage contributes to the abundance of medusae through asexual reproduction and metamorphosis, and may influence the periodicity of medusae by(More)
Adult Carukia barnesi medusae feed predominantly on larval fish; however, their mode of prey capture seems more complex than previously described. Our findings revealed that during light conditions, this species extends its tentacles and 'twitches' them frequently. This highlights the lure-like nematocyst clusters in the water column, which actively attract(More)
Adult medusae of Carukia barnesi were collected near Double Island, North Queensland Australia. From 73 specimens, 8 males and 15 females spawned under laboratory conditions. These gametes were artificially mixed which resulted in fertilized eggs. Post fertilization, most eggs developed to an encapsulated planula stage and then paused for between six days(More)
This research explores the thermal and osmotic tolerance of the polyp stage of the Irukandji jellyfish Carukia barnesi, which provides new insights into potential polyp habitat suitability. The research also targets temperature, salinity, feeding frequency, and combinations thereof, as cues for synchronous medusae production. Primary findings revealed 100%(More)