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aj7

2,136 karma · joined December 7, 2015

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aj7··on Everything about Google Translate crashing React (and other web apps)
I use Google translate all the time, and I definitely noticed you have to kick it to update.
aj7··on Why hasn't commercial air travel gotten any faster since the 1960s? (2009)
Faster? It’s gotten slower! Significantly slower. Haven’t you noticed that modern jetliners don’t really even have swept back wings any more? The sweet spot for fuel efficiency is around 530mph for modern, very high bypass turbofan engines. In the 60’s, turbojet 707’s and DC8’s regularly flew at >600 mph. Gas was 25c a gallon.
aj7··on Ask HN: Physics PhD at Stanford or Berkeley
Physics PhD from Berkeley. If things are more or less equal, choose the private institution. Berkeley is still the most corrupt organization I’ve ever been associated with.
aj7··on In my life, I've witnessed three elite salespeople at work
No. In industry, the best salespersons are listeners and thinkers.
aj7··on One of my papers got declined today
In subfields of physics, and I suspect math, the submitter is never anonymous. These people talk at conferences, have a list of previous works, etc., and fields are highly specialized. So the reviewer knows with 50-95% certainty who he is reviewing.
aj7··on Pi modder successfully adds M.2 slot to Pi 500
Pi 5: https://youtu.be/Qzz0P9yB2V4?si=8OrkmxJJSUfV547Y
aj7··on Ask HN: Is a Carnival sized application of Lenz's law possible?
Plus a means or magnet arrangement to prevent tumbling. But it would be very dangerous getting in and out without special engineering.
aj7··on Optimizing Beer Glass Shapes to Minimize Heat Transfer – New Results
1. Beer glass has to be optimized for ruggedness when washed many times. 2. Beer glass needs to be optimized for manufacturing and packing cost. 3. Numerical modeling is reknown for making elaborate suggestions for 1% improvements.
aj7··on C++ proposal: There are exactly 8 bits in a byte
And then we lose communication with Europa Clipper.
aj7··on Ireland's big school secret: how a year off-curriculum changes teenage lives
Folklore?
aj7··on Mathematicians discover new class of shape seen throughout nature
Would be very interesting to study classical stress analysis in compositions of these shapes subject to external loads. Not to mention vibrational analysis and the forms of wave functions.
aj7··on Dogs can remember names of toys years after not seeing them, study shows
Remember names?

Dogs have egos!!

aj7··on Cruise ships chopped in half are a license to print money
Serendipity on cruises, eh?

The axiom of cruises is: You will never see these people again.

aj7··on A dishwasher can make or break a restaurant (2017)
I’m not as smooth as you.
aj7··on A dishwasher can make or break a restaurant (2017)
Took zero courage. Was in character. Now as an “upper-class” retiree— now there’s a tiny bit of imposter syndrome.
aj7··on My fake job in Y2K preparedness
Remarkably, Twitter had fake jobs for most of its history. Any new Stanford graduate in any field could have one.
aj7··on A dishwasher can make or break a restaurant (2017)
Very cool comment.
aj7··on A dishwasher can make or break a restaurant (2017)
I have a PhD in Physics from Berkeley. Still, in the strictest real estate sense, my best and highest use is as a dishwasher.

I was managing a small optics factory in Livermore. We made laser mirrors to order there — any wavelength, any reflectivity, any angle, any polarization, you name it. I was working my ass off and was unmarried at the time. Thanksgiving came around and I had nowhere to go. But I hooked up with a church in San Jose that had a dinner for poor people and went as a volunteer. After serving the dinner, I wandered back into the dish room. I immediately went over to the sink and kicked out the lady who was pretending to work. I then washed all the dishes and left.

Comes one year later. I’m in the exact same situation. I call up that church. The lady says, “Oh, that’s very nice of you. But we don’t need any more volunteers, we have enough.” Oh shit. What to do. I found my old replica army parka I had bought in a Cambridge surplus store 20 years earlier. I went as a poor person. I didn’t want to be alone.

The first thing I found out is that poor people are herded, controlled, treated like children. We had to wait outside the church in the mild cold until permitted to enter, in a kind of line. So I sit down. I will never forget the beatific smiles of the volunteers that served us. This was performance art, and they were the stars. Everyone on the supplicant end noticed this, I’m sure. So the meal ends. I walk back into the dish room, survey the situation, once again kick out whoever was pretending to do the dishes, do the dishes, and leave.

aj7··on Olivetti Programma 101: At the Origins of the Personal Computer
In 1966, we had one in the Stuyvesant HS computer room, along with an IBM 1130 system that ran Fortran 4. I got good at the Programma, it was quite useful. But I don’t recall 240 steps; I recall less than 100. Indeed, the much more advanced HP 9100 circa 1968, with CRT, rpn, and 10-digit accuracy, had only 196.
aj7··on Can digital emulations be as good as analog hardware?
Oh but I did. In the second sentence.
aj7··on Why are Texas interchanges so tall?
The same reason that the ULA launch system costs more than SpaceX.

Cronyism.

aj7··on Can digital emulations be as good as analog hardware?
Very skeptical of the thesis here. The practical limit is the sampling theorem and the bit resolution, not “computability.”

It is possible that there are persons who can resolve a 25th bit or be disturbed by aliasing associated with the sample rate chosen. But again, there is a bigger effect. It is well known that audiophiles like “warmth” which has often been attributed to analog saturation effects. But ultimately, what enters your ear is analog. It should be possible to design a digital system that reproduces this warmth at the analog ear, compensating for all harsh effects before detection.

aj7··on America is sabotaging itself in the global battle for talent
This is right. I’m an MIT physics SB. The undergraduate curriculum is pretty uniform across schools. A lot of our teachers were poor. But what was being taught, and is always taught at top schools, is mannerisms. What does an actual physicist do? What are his attitudes towards this and that? What is important and what can be ignored? And a lot of those mannerism are taught, reinforced, and related by peers.
aj7··on In the Beginning Was the Command Line (1999)
macOS is behind. And this is speaking as someone who probably owns one of everything Apple makes, Apple stock, and was exclusively Mac for the last 10 years.

I have less than 50 hours use on my Windows 11 machine, a midgrade Lenovo P358 rig I bought renewed because it had plenty of memory and an Nvidia T1000 card. Yet it taught me that the test of an operating system is how quickly you can navigate around, and how well it can find things, given only clues. Windows 11 is just snapper, quicker, than the latest macOS running on a new M3 Mac.

aj7··on How I got my laser eye injury
Crouch? When training technicians, the first thing is, you never ever bend your waist in the laser room, with lasers on. Your head never enters the plane of the laser beams. You do not put your ahead above the laser. You use a piece of copy paper to earache for stray beams near the apparatus. You use an IR viewer to (shock yourself as to how many there are to) find 1064nm stray beams.
aj7··on How I got my laser eye injury
Just for giggles, who owned Spectra-Physics at the time?
aj7··on An approach to the fundamental theory of physics
The challenge, for historians of science, is to segregate Wolfram’s genuine accomplishments, which are considerable, from this stuff.
aj7··on In the Beginning Was the Command Line (1999)
Just got a Windows 11 machine. Had to, to run Solidworks. Have it next to a new M3 iMac. They’re all configured with the same apps. Despite not having used Windows in 10 years, these machines behave identically. But Windows 11 is snappier. And you can actually find things that you don’t know where they are!

I was amazed.

aj7··on Want to spot a deepfake? Look for the stars in their eyes
That’s not large models “understanding physics.” Better, giving output “statistically consistent” with real physical measurements. And no one, to my knowledge, has yet succeeded in a general AI app that reverts to a deterministic calculation in response to a prompt.
aj7··on Ask HN: Where are the good resources for learning audio processing?
Use LabView as a calculation engine to do experiments. The advantage is you get system-like diagrams.
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