On Wednesday, 28 November 2018 08:31:00 UTC-5, Jeroen Belleman wrote:> Clive Arthur wrote: > > On 27/11/2018 18:08, gnuarm.deletethisbit@gmail.com wrote: > >> I am not at all happy to say the Volt production will be ending as > >> part of GM's cut backs. > >> > >> GM is laying off thousands of workers, closing three plants, and > >> ending production of the Chevy Volt > > > > <snip> > > > > On my newsreader, this comes directly after 'New definition of SI > > units', so perhaps there's a new definition of the volt which has > > dropped slightly? > > > I haven't come across the BIPM's definition for the volt, > but in practice --since the late 1980's-- it has been some > number of Josephson junctions in series, excited with some > given frequency. So really it has been tied to h, e and > the second for quite some time already. > > Jeroen Bellemanh is now defined as exactly 6.626 070 150 × 10-34 J⋅s e is now defined as exactly 1.602176634×10−19 C the second is defined in terms of a certain number of Cesium-33 atom vibrations the meter is defined in terms of the speed of light So I guess they confirmed the definition of Planck's constant by measuring an artifact in Paris? --Spehro Pefhany
GM Is Dropping the Volt
Started by ●November 27, 2018
Reply by ●November 28, 20182018-11-28
Reply by ●November 29, 20182018-11-29
On 2018-11-28, Winfield Hill <hill@rowland.harvard.edu> wrote:> Clive Arthur wrote... >> >> ... US Survey Inches which are a little >> less than the 25.4mm 'metric' standard. > > ?? >yeah, until USA adopted the metric standard they had inches a little under 2.54mm and the English inch was a little larger. Thus Canadian survey miles are longer than US survey miles. -- When I tried casting out nines I made a hash of it.
Reply by ●November 29, 20182018-11-29
speff wrote:> On Wednesday, 28 November 2018 08:31:00 UTC-5, Jeroen Belleman wrote: >> Clive Arthur wrote: >>> On 27/11/2018 18:08, gnuarm.deletethisbit@gmail.com wrote: >>>> I am not at all happy to say the Volt production will be ending as >>>> part of GM's cut backs. >>>> >>>> GM is laying off thousands of workers, closing three plants, and >>>> ending production of the Chevy Volt >>> <snip> >>> >>> On my newsreader, this comes directly after 'New definition of SI >>> units', so perhaps there's a new definition of the volt which has >>> dropped slightly? >> >> I haven't come across the BIPM's definition for the volt, >> but in practice --since the late 1980's-- it has been some >> number of Josephson junctions in series, excited with some >> given frequency. So really it has been tied to h, e and >> the second for quite some time already. >> >> Jeroen Belleman > > h is now defined as exactly 6.626 070 150 × 10-34 J⋅s > e is now defined as exactly 1.602176634×10−19 C > > the second is defined in terms of a certain number of Cesium-33 atom vibrations > > the meter is defined in terms of the speed of light > > So I guess they confirmed the definition of Planck's constant by measuring > an artifact in Paris? > > --Spehro Pefhany >Yes, previously, h was measured referring to the BIPM kg. That has now been turned around: h is defined, as are c, e and the second, so now the kg is derived. The Paris kg artefact is no longer *the* kg. Jeroen Belleman
Reply by ●November 30, 20182018-11-30
On Wednesday, November 28, 2018 at 6:11:16 AM UTC-8, Winfield Hill wrote:> Clive Arthur wrote... > > > > ... US Survey Inches which are a little > > less than the 25.4mm 'metric' standard. > > ??When the US went metric-definition on the inch, the surveying standard had been 39.37 inches per meter, and was retained at that distance, which defines the 'statute mile'. For all other uses, the inch is exactly 25.4 mm. In short, it's a hysterical-raisins thing, never gonna make sense. ***% units surveyfoot foot * 1.000002 / 0.999998
Reply by ●November 30, 20182018-11-30
DecadentLinuxUserNumeroUno@decadence.org wrote:> They were only available to lease.You must be thinking of the GM EV1 https://en.wikipedia.org/wiki/General_Motors_EV1 -- Paul Hovnanian mailto:Paul@Hovnanian.com ------------------------------------------------------------------ Great minds discuss ideas, average minds discuss events, small minds discuss people.
Reply by ●November 30, 20182018-11-30
GM will re-badge the Volt as the kg·m^2/s^3·A^1 [ducking and running] -- Paul Hovnanian mailto:Paul@Hovnanian.com ------------------------------------------------------------------ Programmers don't die, they just GOSUB without RETURN.
Reply by ●November 30, 20182018-11-30
On Friday, November 30, 2018 at 8:22:56 PM UTC-5, Paul Hovnanian P.E. wrote:> GM will re-badge the Volt as the kg·m^2/s^3·A^1 > > [ducking and running]You had better run! Rick C. Tesla referral code +-+ https://ts.la/richard11209
Reply by ●November 30, 20182018-11-30
On 11/30/2018 08:17 PM, Paul Hovnanian P.E. wrote:> DecadentLinuxUserNumeroUno@decadence.org wrote: > >> They were only available to lease. > You must be thinking of the GM EV1 > > https://en.wikipedia.org/wiki/General_Motors_EV1 >Yep. Some aspects of the EV1's design made it into the Volt, e.g. the battery configuration where the cells run down the centerline of the vehicle. EV technology has moved on since the Volt went to the drawing board circa 2007-2008 though that topology is obsolete, it compromises interior space, the rear seating is rather small for a car that size and 5th seat basically non-existent. I think they made this half/half electric/range extender configuration about as good as they could for the budget at this point, but it's already "long in the tooth." If you were going to take it further a decade on you'd do a clean-sheet, you wouldn't design a car like that now the way you would ten years ago.
Reply by ●November 30, 20182018-11-30
On 11/30/2018 10:51 PM, bitrex wrote:> On 11/30/2018 08:17 PM, Paul Hovnanian P.E. wrote: >> DecadentLinuxUserNumeroUno@decadence.org wrote: >> >>> They were only available to lease. >> You must be thinking of the GM EV1 >> >> https://en.wikipedia.org/wiki/General_Motors_EV1 >> > > Yep. Some aspects of the EV1's design made it into the Volt, e.g. the > battery configuration where the cells run down the centerline of the > vehicle. > > EV technology has moved on since the Volt went to the drawing board > circa 2007-2008 though that topology is obsolete, it compromises > interior space, the rear seating is rather small for a car that size and > 5th seat basically non-existent.They stuck with that topology to start with the first generation likely in part because the lithiums available at the outset had somewhat less energy density, and they oversized the pack on top of that, maybe by 20 because long-term degredation of packs that size was an unknown. Turns out reliability concerns were overblown, the statistics show that the Volt batteries have been extremely reliable and figures of 50% range loss at 100k miles were absurd overestimates. More like 2-3%
Reply by ●December 1, 20182018-12-01
On 11/27/2018 01:08 PM, gnuarm.deletethisbit@gmail.com wrote:> I am not at all happy to say the Volt production will be ending as part of GM's cut backs. > > GM is laying off thousands of workers, closing three plants, and ending production of the Chevy Volt > https://www.theverge.com/2018/11/26/18112536/gm-layoffs-factory-closing-ending-production-chevy-volt > > From what has been posted here the Volt was an excellent hybrid auto with a lot going for it. I'm sorry to see it go. I wonder why sales were never very high? > > On the other hand, with all the advanced electronics on board, maybe this will help with the shortages of the larger surface mount passives. > > Rick C. > > Tesla referral code - https://ts.la/richard11209 >For those interested in the technical aspects of the design here's a YT video with an animated cutaway of the different operation modes on the Gen 1 Volt: <https://www.youtube.com/watch?v=AX5ZwzNwTc4> The second generation had a number of improvements: <https://www.youtube.com/watch?v=o3-wGOyT2-I>
