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practicemaths

180 karma · joined December 11, 2023

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practicemaths··on PCIe 7.0 Draft 0.5 Spec: 512 GB/s over PCIe x16 On Track For 2025
What's the latency comparison between the memory bus and PCIe?
practicemaths··on A software engineer wore Vision Pro to his wedding, much to his bride's chagrin
Will she get any money then?
practicemaths··on EVs that go 1,000km on a single charge: Gel makes it possible
I think the industry target right now is around 10~15 years 80% capacity. So yeah not bad for an emerging tech.
practicemaths··on Nuclear SMR welding breakthrough
I'm not a welding engineer.

I imagine half of it is checking the welds are to code and certifying it.

practicemaths··on [dead]
> It is an extreme arrogance of political leaders that they believe they can be judged by different criteria from those who run multinational companies

Um... Yes they can and ought to be.

The obligation for being a leader of a government for and by the people is primarily to serve the interest of the people.

The obligation of the leader of a company is to serve those whose money they're in care of to maximize returns.

Conservatively humans have let the old and wise be essential leaders of our families, communities, and larger groups. We are in a society where we select our leaders (in the general sense), if our society selects someone to lead then that is the choice of our society.

If we want to modify the criteria for whom we can select for being our leaders then we to make those changes ahead of time not in the middle of a selection process.

practicemaths··on Semiconductor Fabrication 101
No not really. It's more for electrical or computer engineers. However there's nothing wrong with gaining more knowledge for the sake of it and it can be just nice knowing a bit about how your machine actually works.

Of course, maybe it is more useful if you're into some really low level programming. But for most CS hardware understanding isn't necessary.

practicemaths··on You Shouldn't Start with an SPA
> language necessitates code degenerating into spaghetti

I'm by no means a thoroughly vested expert, so my speculation has little merit here.

However if I had to guess code becoming spaghetti is more a symptom of collaboration between many individuals over a span of time rather than an issue with a specific programming language.

Everyone has preferences and different backgrounds, various "best practices" they've been taught or adhere to.

So when all those little differences merge together over time you get globs and hard to follow code due to changes in conventions or just being lazy when meeting a deadline.

practicemaths··on Ask HN: How to prevent Apple Vision Pro users from filming you?
I am all ears for suggestions on how to actually do that then.

What will the regulations be?

How do you get the government to want to implement such policies?

How do you enforce them?

How do you get around corporate lobbying against changes to their business operations?

practicemaths··on Ask HN: How to prevent Apple Vision Pro users from filming you?
First, I appreciate the paranoia and privacy concerns.

Second, I doubt these will be flooding the streets any time soon., but yes eventually when the cost is lower and technology is more matured.

Third, we're already being filmed by corporate America. Door bell cameras, car cameras, people's phones and online image/video services, and just general corporate surveillance.

Sadly the cat's out of the bag so to speak and aside from wearing anti-recording clothing I don't think there's yet a practical way out of being surveilled.

practicemaths··on Apple is turning developers against Vision Pro before it even arrives
You're making good points.

My reflective thoughts are first if you make a solid piece of software Apple should be hiring you to integrate your product into their main software stack.

Secondly, particularly to your last point, I think this encourages short development cycles and continually pushing something new.

Since if you build a good innovative product you run the risk of Apple undercutting it like you said. Unfortunately this means that there's less incentive to maintain and update a software product in exchange for developing and selling something new.

practicemaths··on Apple is turning developers against Vision Pro before it even arrives
Well that's their business plan isn't it?

Apple makes a device and sells that.

AND having more consumers means more available people for the developers to sell their product to.

Can't all be like Balmer "DEVELOPERS DEVELOPERS DEVELOPERS" for Microsoft, which traditionally isn't trying to sell hardware but just software for people to run on their hardware.

So having more software on their platform is necessary to sell more of their product (for Microsoft/Windows).

practicemaths··on Ask HN: Getting into Energy Industry with Math Background
For general physics I'd recommend Feynman's Lectures, which with your background may be too basic, I don't know.

Engineering wise I'd recommend Horowitz' Art of Electronics.

Aside from that there's so many resources available these days that's it's hard for me recommend one thing but I'd say start collecting sources online and cross referencing.

I know there's a lot of optimization and programming within designing microgrids and battery systems.

So with your background I'd say you're already 70-90% there and the background on theory that the above mentioned books ought to help you with would get you pretty far aside from very particular things.

Hope that helps!

practicemaths··on Plug-in hybrids vs. electric cars: We did the math on which is better for you
> “While EVs will be the wave of the future, gas hybrids make more sense now and, for many of us, always will,” writes George Shaeffer, a reader from Clearwater Beach, Fla., who drives a Camry Hybrid. “I don’t see any reason it can’t last until it’s 20 or 30 years old.”

The problem now is if something like only 20% of cars sold in California can be Hybrid after 2035 then the availability of gasoline will also decline as pure EV becomes the norm.

Even if a car can technically last 20 years, in 20 years will there be fuel for it available? What about mechanics that will work on it? What about parts?

These things will become increasingly less available as demand for them go down and ultimately make owning ICEs hybrid or otherwise increasingly more expensive over time to keep.

Alternatively, cost for a pure EV is high and at the moment the biggest cost of it is the battery that won't last 20 years currently. Though in 15 years the cost of replacement batteries will likely go down.

Either way I view buying any car right now a loss since it's impossible to make a reasonable guess for its worth beyond say 3 years from now.

practicemaths··on Harvard Admissions Should Be More Meritocratic
> When you survey high achieving people in the world, or in your wikipedia history, do you mostly find people who got there because of the opportunities their parents paid for?

When you look into the backgrounds of the people whose names live on as the units we use to describe and measure physical qualities I think you'll find most had a pretty good early educational foundation and financial support from family or a patron.

> Yes, look up the How many of those people have brothers and sisters - do you also find that their entire family does well?

https://en.wikipedia.org/wiki/Nobel_Prize#Family_laureates

There's the Curie's being a prominent example.

You can find other examples of Scientists/Mathematicians having remarkable siblings as well. However in the past the female siblings, while respected by their bother(s), weren't always given the same opportunities to persue intellectual ambitions as their male counterparts were.

practicemaths··on Harvard Admissions Should Be More Meritocratic
Does it actively discriminate or is that just a talking point that is repeated?

Presumably what we want to say is if we have 100 children with similar economic and educational backgrounds and experiences and 70 are of type A, 25 type B, and 5 are type C then when it comes to the college body there ought to be relatively similar representation by those ratios.

That is for every 100 students in college, 70ish are type A, 25ish are type B, and 5ish are type C.

However that's with the premise that each type's makeup of the whole is also having a similar background and experience which we also know is likely not to be true.

So if you wanted to be "more fair" you'd have to include socioeconomic conditions each applicant is coming from rather than just purely by particular racial makeup.

So if you have Low income, middle, high, and 300 students, then take 100 from each income bracket, then within those brackets aim for the racial/cultural make-up be reflective of those income brackets make-up.

practicemaths··on Harvard Admissions Should Be More Meritocratic
"By “merit” I don’t mean cosmic merit — moral deservingness, a judgment by the almighty at the gates of heaven. I mean the traits that enable a student to profit from an elite university education, including cognitive aptitude, conscientiousness, and a thirst for knowledge."

The premise sounds nice however I'd gander that you'd likely end up with a similar results as is the case now, a trend towards the connected and interested wealthy making up the student body of Harvard and other elite colleges.

This is due to people having money being able to afford good educational programs for their children at the start while those without significant affluent backgrounds will have significantly less access to quality educational resources before they reach college age.

On paper meritocracy sounds reasonably fair but in practice I believe we'll find it to be otherwise.

practicemaths··on Neuralink Announces First Brain Chip Implant in Humans
I think the concept and application is awesome.

However I am not sure I would like hardware implanted into my brain if that hardware is produced by an entity that has serious trust issues behind it.

Presumably this stuff will likely not be open sourced and with wireless communications as being an aspect tied to its use how is one supposed to be reasonably assured that this stuff is unhackable within a reasonable manner?

Additionally there's a lot of ethical concerns that come from the research done by Nauralink in particular. If they're this cavalier with their research practices how good are they going to be at guaranteeing to customers this isn't going to lead to horrible diseases or others issues related to their implementation?

practicemaths··on Safetyism killed playtime
I think that's a rather limited experiential take. Rather depends on the neighborhood where you may see kids outside playing freely or not. Regardless:

https://www.npr.org/2021/08/30/1032489883/china-kids-video-g...

Wouldn't you agree China is outside of the anglo-world view?

Wouldn't you agree that is limiting how kids can be kids?

practicemaths··on Apple dials back car's self-driving features and delays launch to 2028
If approximately half the cost of an EV is the battery pack I'm terrified by the prospect of a $10k car...
practicemaths··on Higher vehicle hoods significantly increase pedestrian deaths, study finds
Yup. There's certainly a feedback loop.

Just stating things that make these larger vehicles more easier to drive, especially for women whom on average are generally shorter so, even with pumping the seat up it's still considerably harder to see around traffic.

practicemaths··on Higher vehicle hoods significantly increase pedestrian deaths, study finds
TBF Trucks and SUVs are relatively easier to drive in certain regards.

Such as being able to see over parked traffic when making a turn.

And I've found driving taller vehicles more comfortable for my back coincidentally.

practicemaths··on Cutting down AWS cost by $150k per year simply by shutting things off
“Engineering is the art of modelling materials we do not wholly understand, into shapes we cannot precisely analyse so as to withstand forces we cannot properly assess, in such a way that the public has no reason to suspect the extent of our ignorance.” - Dr. AR Dykes
practicemaths··on Ask HN: How do you know it's time for you to quit your FAANG job?
Where else are you supposed to get average ~10% returns?

Or is your last bit just saying like do some other investments besides purely stock?

practicemaths··on Huawei claims HarmonyOS NEXT kernel is more efficient than Linux
Eh, that user is just blindly aligned with the notion that any criticism of a particular nation(s) or policy is rooted in racism.

They're very much not interested in addressing the issue of how Russia in particular enjoys fighting wars and thus a reflection of their culture and beliefs towards fellow human beings.

practicemaths··on Austin takes a bet on tiny homes to ease homelessness
How is the free market supposed to create an abundance of housing?

You need some sort of scarcity to increase profits. Building plenty of affordable housing works against that.

practicemaths··on Space Solar Power Demonstrator ends first in-space mission
Fair enough.

Near future, I agree it's hard to imagine available resources for this outpacing available resources for fusion.

Though fusion does have some more difficult technical engineering issues than SBS.

By that I mean, as far I know, we have a decent understanding of what materials we would need and how to utilize said material for space based solar.

While with fusion we are close to self sustainings reactions, we still lack understanding on containing the reaction itself for it to be feasible. That is, understanding the magnetic fluctuations around the plasma reaction and having material to housing it for extended periods of time.

Of course with computing simulations becoming increasingly more accurate and powerful, those technical hurdles may not be as stringent as we see them today.

practicemaths··on Space Solar Power Demonstrator ends first in-space mission
The applications for this are well beyond Earth.

Additionally there was a lot more useful testing of various related aspects in this beyond just beaming power to Earth per the article.

practicemaths··on Space Solar Power Demonstrator ends first in-space mission
People were saying the same thing about terrestrial solar for decades.

Both fundamentally are engineering problems now.

Also considering that there has been a lot of investment in space launch vehicles of late the cost to lift things into orbit are lowering.

Technology takes a while to develop and mature with applications for this beyond just beaming power to Earth.

practicemaths··on Pinker was right, I was wrong
Justifiable isn't what's being debated here though.

That's a moral judgement and subjective to each individual.

You said "Israel started the 6-day war in 1967 that led to the present occupation."

Which I said was inaccurate due to the fact that Egypt shutdown the Strait of Tiran to Israel. Egypt started the war.

practicemaths··on Pinker was right, I was wrong
Your support or not support isn't a factor with regarding who started what war over what reason though.
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