@Chris G: Merde de artiste comes to mind.
700 posts • joined 3 Sep 2012
If the sausage roll has a tail sticking out of it, do not eat it. Well, that depends on who's tail it is and how well the locals prepared it.
Delft Dynamics already developed their U-drone. An tethered underground drone for military reconnaissance. U-drone navigates with Australian SLAM (Simultaneous Location and Mapping) software.
The U-drone is one of the many products sponsored by the Dutch army.
One of Delft Dynamics' other products is a drone catcher. See the video.
AFAIR, the Electrologica X8 of the Utrecht University (happy memories) was also fed by a rotary converter. It allowed a save shutdown in case of a brown out.
Math students were allowed to run any pet program, as long as the execution time was 30 seconds or less (and did not use the plotter). Input was by paper tape, output on 132 column line printers. The turnaround time was one day, which made you check your code very carefully. Yes, my first program (Algol 60) succeeded at the first try.
The proposed laser ranging works only for satellites equiped with an intact retroreflector or f.i. large rocket boosters, not for your eh-em garden-variety of space junk. Most satellites do not have retroreflectors. They are not cars where a mirror is obligatory and when a satellite has one and is reduced to space junk by a collision, the mirrors are probably no longer aligned.
In 1947 the Soviet Union bought Rolls-Royce Derwent and Nene engines from the British and the Russians cloned them in their MiG-15 and La-15 jet fighters. Stalin had been skeptical that Britain would sell these engines. Stalin reportedly said "What kind of fool would be willing to sell his secrets!". But the British government agreed to the sale anyway.
Stalin and the Bomb, page 235.
Four supernovae (SNe), exploding 300 pc from Earth, were recorded 44, 37, 32, and 22 kyr ago in the radiocarbon (14C) record during the past 50 kyr. Each SN left a nearly identical signature in the record, beginning with an initial sudden increase in atmospheric radiocarbon, when the SN exploded, followed by a hiatus of 1500 yr, and concluding with a sustained 2000 yr increase in global radiocarbon due to gamma-rays produced by diffusive shock in the SN remnant (SNR). For the past 18 kyr excess radiocarbon has decayed with the 14C half-life.
SN22kyrBP, is identified as the Vela SN that exploded 250 ± 30 pc from Earth. These SNe are confirmed in the 10 Be, 26 Al, 36 Cl, and NO3- geologic records. The rate of near-Earth SNe is consistent with the observed rate of historical SNe.
See however the comment https://arxiv.org/pdf/1406.5141.
Don't forget LED-lamps. The LEDs may have an average lifetime of 20+ khour, but the mini-powerconverter in the socket will fail much sooner. Leading to e-waste with rare-earth metals that will not be recycled.
Then there is the holy cow, the automobile - or how do you call them in you local dialect. The are not (yet) chockfull of e-waste, but the amount of Fe, Al and plastics when they are scrapped must be impressive. Add to that the problem of recycling Li-batteries.
OpenCV's Haarfilter is designed to recognize faces. Trouble is, the analysis is based on grey-scale images. So a kitchen-cupboard with two knobs is also recognized as a face. Now compare the colour of the inscribed ellipsis of the 'face' to the human skincolours which all lay in a well-defined column in RGB-space and you have a DIY face recognition system.
Bob should read https://www.wbur.org/cognoscenti/2020/04/03/hold-the-line-coronavirus-jonathan-smith as you all should do.
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