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John Paul Helveston

@jhelvy.bsky.social

Systems Eng Prof @ GWU πŸ¦› | Director, Data Analytics MS Program | EVs πŸ”‹πŸš— | Low Carbon Tech | Choice Modeling | Survey Research | China | US-China Policy | #rstats | #reproducibility | #opensource | Father | opinions own

10,879 Followers  |  2,733 Following  |  512 Posts  |  Joined: 23.09.2024  |  2.2371

Latest posts by jhelvy.bsky.social on Bluesky

Actually it's worse than that. Most of the energy expended by a (gas) car is exhausted as waste heat, then most of the *remaining* energy is spent on moving the weight of the car.

17.10.2025 23:26 β€” πŸ‘ 7    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
16.10.2025 01:45 β€” πŸ‘ 2    πŸ” 1    πŸ’¬ 0    πŸ“Œ 0
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a man with a beard and long blonde hair is holding a sword in a forest . ALT: a man with a beard and long blonde hair is holding a sword in a forest .
15.10.2025 11:38 β€” πŸ‘ 2    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
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M.I.T. Rejects a White House Offer for Special Funding Treatment

I knew MIT hired smart people
www.nytimes.com/2025/10/10/u...

10.10.2025 16:47 β€” πŸ‘ 1775    πŸ” 252    πŸ’¬ 32    πŸ“Œ 8

Staunton, Virginia

08.10.2025 23:26 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

#Rstats, #python, #julialang

08.10.2025 10:49 β€” πŸ‘ 19    πŸ” 3    πŸ’¬ 4    πŸ“Œ 1

If someone was applying for a job and they sent me a file like this, I'd hire them.

06.10.2025 18:28 β€” πŸ‘ 5    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

The south park satire of ICE is not satire.

02.10.2025 23:35 β€” πŸ‘ 5    πŸ” 1    πŸ’¬ 0    πŸ“Œ 1
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China’s EV supremacy raises national security concerns for the US China is in the driver’s seat when it comes to EV technologyβ€”which poses huge defense implications for the U.S.

Great article in Newsweek by Rebecca Fannin on the dominant position of Chinese EVs globally and the implications for the future of automotive and defense. Well-researched article with quotes from me, Paul S. Triolo, Michael Dunne, Kara Kockelman, and others.

www.newsweek.com/chinas-ev-su...

01.10.2025 23:30 β€” πŸ‘ 7    πŸ” 0    πŸ’¬ 1    πŸ“Œ 1
29.09.2025 00:30 β€” πŸ‘ 73    πŸ” 12    πŸ’¬ 8    πŸ“Œ 0
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Energy Dept. adds β€˜climate change’ and β€˜emissions’ to banned words list It is the latest in a series of Trump administration efforts to dispute, silence or downplay climate change.

U.S. Dept. of Energy Office of
Energy Efficiency and Renewable Energy banned from using words like "climate change" or "emissions"...you know, phrases that have nothing to do with things like energy efficiency or renewable energy πŸ€¦β€β™‚οΈ

www.politico.com/news/2025/09...

28.09.2025 21:27 β€” πŸ‘ 10    πŸ” 5    πŸ’¬ 2    πŸ“Œ 1

Doing harm to universities and science is the point

27.09.2025 16:35 β€” πŸ‘ 3    πŸ” 1    πŸ’¬ 0    πŸ“Œ 0

He would still be working for ICE if he was wearing a mask in this video

27.09.2025 13:03 β€” πŸ‘ 60    πŸ” 8    πŸ’¬ 3    πŸ“Œ 0

I write like 1,000 functions before writing a single test function for any of them

27.09.2025 13:01 β€” πŸ‘ 2    πŸ” 0    πŸ’¬ 2    πŸ“Œ 0
Deploy a Shiny Application with R to Connect Cloud – Posit Connect Cloud Documentation

Very cool experiment! Glad you were able to leverage surveydown for it :)

Btw, on performance we have found deploying on posit connect cloud to be much snappier

docs.posit.co/connect-clou...

23.09.2025 10:15 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0
Screenshot of my cancellation of Disney plus. Message says "I am cancelling because Disney is run by a coward too afraid to stand up to fascism"

Screenshot of my cancellation of Disney plus. Message says "I am cancelling because Disney is run by a coward too afraid to stand up to fascism"

Looks like we'll just have to watch Bluey on YouTube from now on

20.09.2025 14:36 β€” πŸ‘ 7    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

$40k for an EV with just 216 miles of range does not even qualify as "average" imo. That's a very tough sell in a market where you can get a similar gas car for at least $10k less. Make that same EV for $25k and it'll sell like crazy, even if it had the interior of a Corolla.

19.09.2025 00:23 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
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a man in a suit and tie is giving a thank you sign . ALT: a man in a suit and tie is giving a thank you sign .
17.09.2025 19:13 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

For those at #positconf I'll be presenting this in one hour in Regency VII!

surveydown.org

17.09.2025 17:47 β€” πŸ‘ 6    πŸ” 1    πŸ’¬ 0    πŸ“Œ 1

The GOAT RStudio addin by @milesmcbain.bsky.social

17.09.2025 14:15 β€” πŸ‘ 2    πŸ” 0    πŸ’¬ 0    πŸ“Œ 1

duckdb is great for speed and doing analysis with large sizes. Data size is pretty small for surveys, and what we needed is something very mature and stable and easy to build on.

14.09.2025 10:50 β€” πŸ‘ 2    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

The man did not deserve to be murdered, but no, he did not practice politics the "right way" @ezrakleinbot.bsky.social. Calling your opponents cockroaches and saying gay people should be stoned is exactly the kind of dehumanizing language that leads to violence and should be condemned, not envied.

11.09.2025 14:32 β€” πŸ‘ 7    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

Political violence of all kinds is wrong, criminal, and must be condemned, regardless if it is committed against an inspirational and honorable lawmaker from Minnesota or a far-right activist who believed that having some "unfortunate" gun deaths each year is worth it for the 2nd amendment

11.09.2025 10:24 β€” πŸ‘ 13    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0
line chart of surveydown repo, which went from ~5 stars to 125+ in 18 months πŸš€

line chart of surveydown repo, which went from ~5 stars to 125+ in 18 months πŸš€

One week til I present on our survey platform surveydown at #positconf! If you've ever wanted a #Quarto for surveys, this is it! πŸš€

#rstats
surveydown.org

09.09.2025 10:14 β€” πŸ‘ 16    πŸ” 0    πŸ’¬ 1    πŸ“Œ 1

I'm no political strategist, but I'd say the illegal occupations of our cities are rather unpopular. The Dems once again will have an opportunity to say something about that: end the occupations, or we shut the government down. But I also expect that they will, again, cave.

08.09.2025 17:12 β€” πŸ‘ 3    πŸ” 1    πŸ’¬ 1    πŸ“Œ 0
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a man with a beard and mustache is smiling and looking at the camera . ALT: a man with a beard and mustache is smiling and looking at the camera .
07.09.2025 11:36 β€” πŸ‘ 3    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0

Oh boy... apologies if this is partially my fault πŸ€¦β€β™‚οΈ

04.09.2025 11:29 β€” πŸ‘ 2    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0

Oh you wanted secret tech. Oh yeah no it's all very much in the open how far ahead they are in EV and battery tech.

03.09.2025 16:20 β€” πŸ‘ 3    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0

You should at take a look at the EVs being made in China vs everywhere else in the world.

03.09.2025 16:16 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0
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a man with long hair and a beard is giving a thumbs up and saying `` many thanks '' . ALT: a man with long hair and a beard is giving a thumbs up and saying `` many thanks '' .
03.09.2025 10:19 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

@jhelvy is following 20 prominent accounts