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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).
We’re thrilled to announce that the first results from Fermilab’s Muon g-2 experiment strengthen evidence of new physics! #gminus2https://t.co/tUx4ojzIps pic.twitter.com/t1ufui2Mwu
— Fermilab (@Fermilab) April 7, 2021
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.
Rather different takes on new muon g-2 measurement:
— Frank Wilczek (@FrankWilczek) April 7, 2021
4.2 deviation from Standard Model (SM) prediction: https://t.co/IGEnG5PQ8r
vindicates SM, after better QCD calculation (done pre-announcement): https://t.co/M3uqedxQoD
my take, for now: ?
Posted at
20:41
THE HAPPENING WORLD: Farewell, Ms. Tree and Ms. Chief
Today marks the retirement of both “Ms. Tree & Ms. Chief”, the wacky fairing catching ships. @spacex will no longer try & catch the fairings, just fish them out with a new boat “Shelia Bordelon” To say goodbye, our “fairing recovery” stickers are half off! https://t.co/sGEPzV8z8x pic.twitter.com/5azMyvewKg
— Everyday Astronaut (@Erdayastronaut) April 7, 2021
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
CONTINUITY: IBM System/360: Announced 57 Years Ago Today
IBM announced the groundbreaking System/360 family of mainframes 57 years ago today. The important, and unusual, innovation was a single architecture for all applications, from office to giant datacenter. The 360 cemented IBM's dominance of computing for decades. pic.twitter.com/IMa5RCAmag
— Ken Shirriff (@kenshirriff) April 7, 2021
Posted at
18:27
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
CONTINUITY: Mysteries of the Gaps Between Prime Numbers
Posted at
14:14
CONTEXT: User Interface
Yes I can but can you drive a Kenworth W900L? pic.twitter.com/brndhFs0yb
— LT Ironfox (@Lt_Ironfox) April 3, 2021
The Kenworth W900 series of trucks has been in continuous production since 1961.
Posted at
11:20
THE HAPPENING WORLD: SpaceX Starlink Launch
SpaceX teams at Cape Canaveral are readying for the company’s 10th Falcon 9 rocket launch of the year Wednesday, another flight devoted to delivering satellites to orbit for the Starlink internet network.
— Spaceflight Now (@SpaceflightNow) April 7, 2021
Full story: https://t.co/q7cRlKEhFz pic.twitter.com/urVM41Awid
Launch is scheduled for 16:34 UTC today, 2021-04-07.
Posted at
11:03