The absorbent was analysed by SEM and XRD and the magnetic alloy powder-paraffin sample was made a complex permeability measurement in the radar frequency.

对吸收剂进行SEM与XRD分析，并对磁性合金粉体-石蜡样品进行雷达频带复磁导率的测试。

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ADS-B promises to make air traffic control easier, cheaper and in many ways safer by allowing planes to transmit their locations by radio frequency instead of depending on towers to use radar to track and coordinate them.

FORBES: Next-Gen Air Traffic Control Vulnerable To Hackers Spoofing Planes Out Of Thin Air

There is clearly no increase in their frequency, even as the total number of reported tornadoes has more than doubled with radar detection.

FORBES: The Great Tornadoes Of 2011 Put In Perspective

The slow decline in tornado death frequency from the mid 1920s through the early 1950s was greatly accelerated by the deployment of weather radar in the 1950s and 60s.

FORBES: The Great Tornadoes Of 2011 Put In Perspective