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Annual variations of freezing heights are derived using two sources of data over tropical and subtropical regions. The variations show latitude dependence and are compared with the standard distribution used for rain scatter interference prediction procedure. Interference calculations performed using the new set of distributions show some differences at(More)
We have developed in-situ space charge measurement system during ageing tests of printed circuit boards by the pulsed electroacoustic method. It can observe space charge profiles at 358 K (85degC) and 85%RH. Experimental results suggest that internal space charge behaviour is strongly affected by the humidity. This technique should contribute to evaluate(More)
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