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New radio telescopes under development, will significantly enhance the capabilities of radio astronomy in the Southern Hemisphere. South Africa, in particular, is actively involved in the development of a new array (MeerKAT) as well as in the expansion of existing very long baseline interferometer arrays in the south. Participation in these new developments demands a thorough understanding of radio astronomy techniques, and data analysis, and this thesis focusses on two projects with the aim of gaining such experience. The Southern Hemisphere very long baselines array is not well served with calibrator sources and there are significant gaps in the present calibrator distribution on the sky. An adequately dense, well distributed, set of strong, compact calibrator or reference sources is needed. With this in mind, observations using the ...
New radio telescopes under development, will significantly enhance the capabilities of radio astronomy in the Southern Hemisphere. South Africa, in particular, is actively involved in the development of a new array (MeerKAT) as well as in the expansion of existing very long baseline interferometer arrays in the south. Participation in these new developments demands a thorough understanding of radio astronomy techniques, and data analysis, and this thesis focusses on two projects with the aim of gaining such experience. The Southern Hemisphere very long baselines array is not well served with calibrator sources and there are significant gaps in the present calibrator distribution on the sky. An adequately dense, well distributed, set of strong, compact calibrator or reference sources is needed. With this in mind, observations ...
Sugar gliders have become popular pocket pets particularly in the United States, Canada and Japan. They are also a popular small marsupial in zoo collections throughout the world. In zoo collections they are generally hardy, presenting to the veterinarian mainly with issues of periodontal disease or traumatic injuries. Pet sugar gliders may present with more veterinary problems particularly associated with inappropriate housing and diet. This article summarizes the husbandry and veterinary care of sugar gliders, with an emphasis on providing the specific needs for which the animal is adapted in the wild.
As partial justification of their framework for iterated belief revision Darwiche and Pearl convincingly argued against Boutiliers natural revision and provided a prototypical revision operator that fits into their scheme. We show that the Darwiche-Pearl arguments lead naturally to the acceptance of a smaller class of operators which we refer to as admissible. Admissible revision ensures that the penultimate input is not ignored completely, thereby eliminating natural revision, but includes the Darwiche-Pearl operator, Nayaks lexicographic revision operator, and a newly introduced operator called restrained revision. We demonstrate that restrained revision is the most conservative of admissible revision operators, effecting as few changes as possible, while lexicographic revision is the least conservative, and point out that restrain...
Changes in the technical specifications for a global positioning system (GPS) receiving system dedicated to space shuttle use are presented. Various hardware functions including acquisition, tracking, and measurement are emphasized. The anti-jam performance of the baseline GPS systems are evaluated. Other topics addressed include: the impact on R/PA design of the use of ground based transmitters; problems involved with the use of single channel tests sets; utility of various R/PA antenna interconnections topologies; the choice of the averaging interval for delta range measurements; and the use of interferometry techniques for the computation of orbiter attitude were undertaken.
Despite their popularity and place in our recreational history, in recent years zoos have undergone considerable change in both their structure and function. While remaining attractive places of entertainment, zoos today also emphasize their contribution to wildlife conservation. This article reviews the role of zoos in wildlife conservation and discusses the effectiveness of their present policies and actions. It is apparent that the major contribution comes through their ex situ actions, including education programs, and captive breeding and management of wildlife. However, recently, zoos have also become more involved with in situ conservation, predominantly through recovery programs for endangered species in cooperation with government authorities and local communities. However, such activities are expensive, and a major obst...
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