Is ‘The Buzzer’ signalling war? Russia’s ‘Doomsday Radio’ activity sparks global alarm

The recent surge in transmissions from Russia's mysterious shortwave radio station UVB-76, known as 'The Buzzer,' raises ...
IEEE

Sub-kHz-Linewidth Wavelength-Tunable Single-Frequency Ring-Cavity Fiber Laser for C- and L-Band Operation

Abstract: In this paper, a sub-kHz-linewidth wavelength-tunable single-frequency ring-cavity fiber laser operating in C- and L-band is demonstrated experimentally. In our design, a single-longitudinal ...
IEEE

Influence of 16–30-kHz Sinusoidal Voltage on Surface Discharge Characteristics at Different Pressures

Abstract: Due to the specific communication requirements of high-altitude platforms, such as research institutes and monitoring stations in mountainous areas, as well as aircraft, voltage sources ...
The Hindu

Sennheiser launches its premium wireless headphones HDB 630 in India

Sennheiser on Friday (November 28, 2025) launched its premium wireless headphones, the HDB 630, with active noise cancellation in India for high-fidelity sound. Sennheiser HDB 630 uses a newly ...
The Hindu

How are passengers able to access the Internet on aeroplanes?

Passenger Internet on aeroplanes used to be rare in the 2010s but has become almost commonplace today. On most flights, the basic idea is that the whole aeroplane is treated like a flying Wi-Fi router ...