'Rock clock' refines time measurement of Earth's early complex animal life

How can we measure time more than 500 million years into the past? A study recently published in Nature Communications by ...
IEEE

Self-Adaptive Measurement Matrix Design and Channel Estimation in Time-Varying Hybrid MmWave Massive MIMO-OFDM Systems

Abstract: Channel estimation in hybrid massive multiple input multiple output (MIMO) orthogonal frequency division multiplexing (OFDM) systems is challenging as only low-dimensional channel ...
IEEE

Ultrasonic Measurement Method of Bolt Axial Stress Based on Time Difference Compensation of Coupling Layer Thickness Change

Abstract: The accurate measurement of the axial stress of the core engine rotor bolts is of great significance for improving the assembly quality and safety of aeroengines. To solve the problem that ...
American Songwriter

On This Day in 1977, Elvis Presley Topped the Charts for the Last Time in His Life With a Song He Only Performed Once

On this day (February 19) in 1977, Elvis Presley reached the top of the Billboard Hot Country Songs chart with “Moody Blue.” It would be the King’s final trip to the top of the chart before his death ...