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April 7, 2021 Archives

Wednesday, April 7, 2021

THE HAPPENING WORLD: It's Magnetic Moment of the Muon Day!

Fermilab reports precision measurements which strengthen the case for physics beyond the standard model (anomalous magnetic moment of the muon).

And on the same day, a computational quantum chromodynamics group reports that previous theoretical calculations were incorrect and that a recalculation from first principles is consistent with the experimental results.

Posted at 20:41 Permalink

THE HAPPENING WORLD: Farewell, Ms. Tree and Ms. Chief

Apparently SpaceX have given up on trying to catch payload fairings before splashdown and will routinely recover from the sea in the future. Having now re-flown a number of fairing halves after they splashed down, that seems a viable strategy for the future.

Posted at 20:18 Permalink

CONTINUITY: IBM System/360: Announced 57 Years Ago Today

Posted at 18:27 Permalink

CONTINUITY: Hewlett-Packard 9825T Repair Part 1: Power Supply

In January, 2021, Curious Marc's 1970s vintage Hewlett-Packard 9825 laboratory computer blew up when a single transistor in the power supply failed with a dead short from emitter to collector which placed 13 volts on the +5 power supply rail. This caused one integrated circuit on one of the boards to literally explode, with less apparent damage elsewhere the way to bet. The diagnosis and repair adventure begins with fixing the power supply.

Posted at 14:41 Permalink

CONTINUITY: Mysteries of the Gaps Between Prime Numbers

Posted at 14:14 Permalink

CONTEXT: User Interface

The Kenworth W900 series of trucks has been in continuous production since 1961.

Posted at 11:20 Permalink

THE HAPPENING WORLD: SpaceX Starlink Launch

Launch is scheduled for 16:34 UTC today, 2021-04-07.

Posted at 11:03 Permalink