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May 2, 2021 Archives

Sunday, May 2, 2021

CONTEXT: Using Liquid Air or Nitrogen as an Energy Storage and Transmission Medium

The Cryomatiks turbine cryogenic expander presently has specific energy around the same as lithium battery packs on current electric vehicles. It is being developed for commercial and fleet vehicles which can be refueled at their depots, avoiding the need for a wide-scale distribution infrastructure for the liquefied gas (which is already produced on a large industrial scale for other uses).

Posted at 15:41 Permalink

CONTINUITY: Rediscovery of the Coelacanth

Posted at 12:38 Permalink

CONTINUITY: HP 9825 Repair Part 6: Can the HP 547A Probe Get Us Out of Trouble?

As analysis progresses of the damage done to a 1970s vintage Hewlett-Packard (H-P) 9825 laboratory computer by a single shorted transistor in its power supply, one of the worst nightmares in digital circuitry debugging manifests itself: a stuck bit in an on-board bus. The stuck bit could be due to any of the numerous components on the bus, all soldered in place. To deal with this problem, in the 1970s, H-P introduced a piece of test equipment, the HP 547A current tracer. The idea was that by sensing the magnetic field of current flowing to the fault in the circuit, it would be possible to localise the fault on a bus with many components attached. Can this H-P gadget diagnose the fault in this H-P computer?

Posted at 11:57 Permalink

THE HAPPENING WORLD: SpaceX—Crew-1 Mission Return to Earth

Posted at 11:05 Permalink