PubMed · 628945
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K L Tan. 1978. Simple methods in nursery care.. https://doi.org/10.1177/004947557800800115
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The heating performance of prototype variable power control units attached to two domestic microwave ovens, 500 W and 700 W, was investigated. The units employed the phase control method where rated voltage was obtained by switching AC supply at a particular angular position on the sinusoidal voltage. In order to create experimental conditions employed in a previous study, Sydney tap water (50 mL) was heated at a 10% power level in the 500 W oven. Water boiled at 10 min in both experiments. However, the precision and control of the heating was greatly improved with addition of the control unit. A disinfecting solution (50 mL) and a tissue fixative (10 mL) were included for experiments with the 700 W oven. A power level of only 1% was sufficient to maintain the temperature of the fixative at low temperatures (30-40 degrees C) where many biological reactions occur. The present results indicate that microwave heating power can be controlled by the variable power control method. This will make temperature control possible through the provision of an electronic feedback loop which links a thermocouple with the power control unit.
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Hypoxia must be prevented in the newborn. It causes atelectasis, acidosis and pulmonary vasoconstriction, which leads to further hypoxia and, ultimately, brain damage. On the other hand, retrolental fibroplasia and bronchopulmonary dysplasia may result from too-vigorous use of oxygen therapy. Frequent blood gas measurements are required. Administered oxygen must be humidified and heated, and the oxygen concentration must be monitored with each delivery system. It is not enough to know the oxygen flow rate; an oxygen analyzer is essential.