Royal Australian Navy Laser Airborne Depth Sounder, The First Year of Operations

The Laser Airborne Depth Sounder (LADS) has been a longstanding research and development project with the Royal Australian Navy. Following Defence Acceptance Trials the system was provisionally accepted into service and commenced operational surveys in north Queensland in March 1993. The majority of the year saw LADS surveying in the Flinders Passage area from operational bases in Townsville and later Caims. During that period a number of enhancements were implemented and LADS was formally accepted into naval service on 8th October. In November a new survey was commenced between Fairway Channel and Bunker Reef, about 200 nautical miles north of Caims. After dealing briefly with the history of development, this paper will concentrate on the operational and surveying aspects of LADS' first year, and comment on the direction of further development

Facial eczema in West Australian sheep

SINCE 1894 when the disease was first described in New Zealand, the term facial eczema has been used to describe a specific photosensitization of sheep in that country

Internal parasites of cattle

Worm parasites can have a most serious effect on cattle, even causing deaths. This article describes the main parasites of cattle, treatment with modern anthelmintic drugs and the best means of preventing and controlling worm outbreaks

Health in old age

Introduction: page 1

Mainly about emphysema of the lungs: A study on different aspects of a disease

Emphysema is a common and disabling lung disease. It is not necessarily generalised in distribution but frequently appears to be predominant in the apices or in the bases. A recently developed physiological method using a radioactive gas has made possible the study of regional lung function and well established techniques are available for assessing the overall distribution and exchange of respiratory gases. These, coupled with careful clinical and radiological methods have been used in this study to identify and assess the effect of localised and generalised pulmonary emphysema. Comparison of these methods of examination in a number of patients suffering from emphysema comprises the main subject matter of this thesis. It is hoped that observations made in this way will assist the physician to a better understanding of the different forms of the disease and the resulting functional effect. Chronic bronchitis cannot be ignored in this study as it frequently complicates emphysema or is complicated by it. The functional effects of bronchitis, like emphysema, are severe airways obstruction and an impairment of gas exchange within the lung. At present there is no radiological or clinical evidence that the effects of bronchitis are localised. It is difficult with present techniques to separate the effects' of emphysema from bronchitis when the two diseases occur together. Therefore, I have tried to evaluate regional and overall lung function in selected cases where there is bronchitis but no evidence of emphysema and emphysema but no bronchitis. By comparing the two groups I hoped to find the functional effects of these diseases separately. As the aetiology of emphysema is unknown and the nature of the lesion destructive, physicians can only observe and try to prevent complicating infection. In some cases evident localisation of the disease attracts the possibility of surgical intervention. Removal or plication of the affected lung are procedures which are undertaken in this type of case. The criteria for selection of patients, the rationale of the venture and the outcome have not been established, I intend to consider these problems in the light of the results of studies done on a few patients before and after operation. As there are several different aspects of this study each will be considered in a separate chapter with presentation of the relevant results and discussion

Ovine vibriosis : a new cause of sheep infertility

Vibrionic abortion of sheep has caused heavy losses in a number of wheatbelt flocks. In several flocks up to 50 per cent, of the ewes aborted as a result of this newly reported disease. This article gives the history of the disease in this State, and describes the symptoms for the benefit of other farmers whose flocks may be affected. Ewes become immune after the first attack