jabl

42 ms·

601.
by jabl 3y ago
I think what did them in was that the auto market is operating on thin margins, and with ever increasing R&D costs for new platforms, it was inevitable that the small vendors would be knocked out.
602.
by jabl 3y ago
To be honest, liquid hydrocarbons are a very good energy source when weight and volume is important, like aircraft. Battery-electric planes will likely become a thing for short range flights, but I'm having a hard time seeing how anyth
603.
by jabl 3y ago
My favorite SR-71 story. Must have been sight to behold down on the ground seeing the plane blast by at full afterburner.
604.
by jabl 3y ago
Yes, that is correct, though I guess an issue would be that the drag would increase sharply if parts of the plane is sticking out of the shockwave, necessating even more thrust.
605.
by jabl 3y ago
I guess the point is you can make an estimate of the CIT based on the geometry of the plane, and the speed and altitude it's traveling at. And similarly the CIT limit can be estimated from published data about the engine plus knowledge
606.
by jabl 3y ago
Perhaps this is on occasion of https://news.ycombinator.com/item?id=36028041
607.
by jabl 3y ago
I definitely recall seeing some other kanban implementation done in a very similar way, in that all state was kept client side in the browser, server-side was basically just a html page with some JS. Now that I google around there seems to
608.
by jabl 3y ago
The rule of thumb is that the road wear is roughly proportional to the fourth power of the axle weight.
609.
by jabl 3y ago
This. I can obviously only speak for myself, but over the years I've tried a lot of different desktop environments and window managers ( http://www.xwinman.org/ was a favorite when I was getting started with Linux back
610.
by jabl 3y ago
> That's part of why thermonuclear weapons have such a disturbingly high "bang for the buck." The enriched uranium or plutonium primary is really expensive. So is the rocket that gets it where it's going. But the lith
611.
by jabl 3y ago
> I wonder whether there is good research on market design for goods like electricity that are: Plenty. E.g. a well argued defense of the current energy-only marginal pricing model: https://papers.ssrn.com/sol3/paper
612.
by jabl 3y ago
First, if you read through that scipy issue ( https://github.com/scipy/scipy/issues/18118 ) the author was willing and able to relicense PRIMA under a 3-clause BSD license which is perfectly acceptable for sci
613.
by jabl 3y ago
AFAIU the main challenges is that the thermophysical properties of CO2 are different than for the usual fluorocarbon refrigerants, so it needs a different design taking that into account (among others, needs to handle much higher pressures)
614.
by jabl 3y ago
In a personal car sized vehicle it's probably less than 1 kg, circulating in a closed system. The only time it will enter the atmosphere is in case of a leak, or when doing some service on the AC unit where the refrigerant parts need t
615.
by jabl 3y ago
Mill uses something similar as well. That being said, I have <1% confidence in Mill ever moving past the slideware stage, so...
616.
by jabl 3y ago
> ... or a more complex system to try to avoid throwing away so much work. IIRC Jim Keller said in some interview that modern x86 uses prediction and speculation (similar to branch prediction), and it works surprisingly well.
617.
by jabl 3y ago
If they'd have used the "original" method, they wouldn't have any radio onboard either, so would never have gotten info about the sailing boat in distress. :)
618.
by jabl 3y ago
I think it's a question of how you design the OS kernel. Consider for example an application that has opened a file, and now wants to read data from the file. So it calls the read() syscall ( https://pubs.opengroup.org/o
619.
by jabl 3y ago
Smaller tends to mean it's easier to make things like passive emergency cooling systems (e.g. using convection and gravity), so you're not dependent on the diesel gensets actually starting when they're really needed.
620.
by jabl 3y ago
f2py is a tool for calling Fortran code from Python, it doesn't translate Fortran into Python.
621.
by jabl 3y ago
> There is a point about making it as easy and idiomatic to write performant code. There is certainly truth in that and certainly Fortran has an advantage here vs. C++ due to the aliasing rules and generally lack of subtle performance fo
622.
by jabl 3y ago
It was, and AFAIU still is, a grassroots effort started by people who liked Fortran as a language, but decided that the state of package management and availability of "standard" libraries was behind other languages, and decided t
623.
by jabl 3y ago
Of all the commonly used languages, C++ is the most complex, baroque, and filled with subtle and not-so-subtle footguns. Of course with all that downside comes the upside that C and C++ are the lingua franca for low level programming where
624.
by jabl 3y ago
The scientific Python stack (numpy, scipy, matplotlib + a plethora of more specialized things) were definitely a very big thing 10 years ago. Deep learning was just on the cusp of taking off in a major way, but in traditional numerical comp
625.
by jabl 3y ago
AFAIU there are some people in LANL that have been for quite a while on some kind of holy crusade against Fortran. Their opinions AFAICS aren't really shared by the computational science community at large, or the other US nuke labs fo
626.
by jabl 3y ago
Current denim fabrics typically contain some 5% elastane, which gives a bit of strechiness, but doesn't last that long.
627.
by jabl 3y ago
It's an undo log containing the deltas from the latest version (instead of the entire row), so that a previous version can be reconstructed in case of a rollback or if a concurrently running transaction needs the previous version.
628.
by jabl 3y ago
1. It's a backward delta. So it's only needed when a transaction touches a row that has been modified by a concurrently running transaction. (Details differing depending on isolation level etc.). Writes can be faster because only
629.
by jabl 3y ago
Also the paper linked from TFA goes into the various implementation options in more detail: https://db.cs.cmu.edu/papers/2017/p781-wu.pdf
630.
by jabl 3y ago
Shame that zheap seems to have fizzled out. Do you think there's any prospect of it being resurrected and eventually mainlined?

More ›