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tomek_ycomb

33 karma · joined February 20, 2021

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tomek_ycomb··on Cough or sneeze? How the brain knows what to unleash
It definitively works with bright lights, but intensity seems important (maybe also spectrum.) I find only a light that would hurt to stare at works
tomek_ycomb··on Does Astrology Work?
So frame astrology type things as a randomization tool, that allows you to randomly navigate a set of questions and assessments to see how you're doing and feeling.

Remember when we learned about how bone divination helped hunter gathers search random areas and not be stuck with the bias of hunting where you previously hunted too much?

Kind of related. But, anyway, what I'm trying to say. I also feel like it's a snake oil scam and impossibly hard to avoid dishonesty at a random sample of astrologists.

My random card reader really flipped my head around when they promised me my reading without knowing my question or answers. They asked me how I felt about my questions and some considerations I could take about the answer and outcome, based on my cards. They said it was a process to navigate your thoughts, not for future telling. And I was impressed enough at this reframing to want to try and convince a few other HN nerds to consider this point as well. Be upset about the scammers but don't miss the possibility there can be a nugget of value and process outside of what you're expecting. There tend to be reasons why people continue doing things across cultures and time (there's something they get value out of in it, usually)

tomek_ycomb··on Ask HN: What indoor CO2 monitor do you recommend?
Excellent information from the person(s?) running air gradient with regards to pm sensor tech and design. Blog posts, etc.

Ranges of kits from pre assembled to solder-yourself, that HN might like.

(I am happy with my unit I gave to a friend with a wood fire stove heated house, and built one from kit to save some $ another time.)

tomek_ycomb··on Beyond velocity and acceleration: jerk, snap and higher derivatives (2016)
Accelerometers and gyros are used and integrated to get their higher order information. However the trick is neither sensor type is perfect so you fuse as much data as needed to get close to good and correct for drifts

Kalman filters come up a lot, maybe relevant to the terms you're looking for

tomek_ycomb··on Beyond velocity and acceleration: jerk, snap and higher derivatives (2016)
It's nature, it's continuous at small enough scales.

But, checkout Zeno's paradox for more on your philosophical questions

tomek_ycomb··on Beyond velocity and acceleration: jerk, snap and higher derivatives (2016)
I think bus is braking with a constant breaking force.

But, the bus has a non-constant kinetic energy (going up with the velocity*velocity, down as velocity goes down.)

So, you're actually producing a non-linear acceleration. This is jerk, but you can also think of it as just a non-linear acceleration and people are reacting to the fact it's not at all near constant deacceleration, and this is most noticable as velocity hits zero.

So, yes, it's jerk, but no, I think it can be intuitively better understood with pure acceleration terms and no jerk needed

tomek_ycomb··on Beyond velocity and acceleration: jerk, snap and higher derivatives (2016)
UHHHHHhhhh, it's because the last A*b is the only one that becomes a linear constant. For other polynomials, your derivative is a polynomial still, just different one.

These are mathematical derivatives, I think of them as the slope of the thing it's derived of, aka the change in the thing that it's a derivation of.

I think I don't have a sophisticated mathematical understanding, but my basic mechanic understanding makes it feel simpler than your question is acting.

tomek_ycomb··on 'The big problem is water': UK ebike owners plagued by failing motors
It's much easier to manage tension on 3x7 over 1x9
tomek_ycomb··on Telegram has launched a pretty intense campaign to malign Signal as insecure
I think this not wrong but mildly misleading.

Whatsapp started encrypting messages after significant security issues in ~2012

It was purchased by Facebook under initially some administration separation terms in ~2014?

In 2016 it added e2e encryption. If I recall this was controversial because it limits fb ad potential on users.

I guess what I'm trying to say is that the timeline seems to me to still be pointing towards <<e2e came from Whatsapp not FB as an initiative, even if FB owned Whatsapp at the time.>>

Again you're not factually wrong, but I hope my restating of the timeline makes it more clear why i I think your reverse order point doesn't tell the same story.

tomek_ycomb··on Elegant Wind Turbine Blades Made of Wood Can Outperform Composites
Just to reiterate what other people have said, no! There are extremely few cases residential wind makes sense. Maybe in some cases where geometry of buildings allows for an effective wind sweep much greater. But otherwise, winds aren't windy enough at building level.
tomek_ycomb··on Eight Feet Jolted a $180M Real Estate Deal
Are you sure / do you have specific Japanese knowledge?

My gut assumption, not having Japanese knowledge, was always that the production needs of WWII incentivized their mixed commercial -residential system.

It does seem that a mixed commercial -residential system would work better with a conscientious of neighbors society, but the zoning itself is also key

tomek_ycomb··on Ask HN: Happy 404 Day. Whats your favorite 404 error page?
Grooveshark panda
tomek_ycomb··on Spinner-mouse: Arduino-based USB rotary controller for Arkanoid, Tempest, etc.
It's a fun exercise in which I think you'll find polling to be fine for many Arduino cases. Not as much for raspi and higher level in my limited experience for various hardware reasons and overhead. And quickly when you do other stuff, especially blocking high level communication, polling does suffer. But interrupts exist and are a reasonable level 2 for people to learn.

https://www.mikrocontroller.net/articles/Drehgeber is an excellent article (in German, Google translate is fine afaik. Check the interrupt section

tomek_ycomb··on An approach to design high-power lithium sulfur batteries
Randomly grabbed some soil strength (it varies alot), but a reasonable number seems 3000 pounds per square foot.

That puts your number at. (3k4010) / (16k*2.2) (estimating width of the 40 foot at 10 feet),

Uhh.. 34 containers. I think that's enough.

In reality you would be able to drive helicoil foundations or any number of things to change the dynamic. I agree the foundations would be secondary to the rest of the system cost in general though

tomek_ycomb··on New Aztec Codices Discovered: The Codices of San Andrés Tetepilco
I told my [family member] this for years she should edit her digital photos. She said, no, my 40k pictures are a retirement project. Then I said <<you'll be overwhelmed by that many photos>> and actually I was wrong.

AI photo stuff massively improved, and all her bad photos were very easy to sort in Picasa and bring down to a reasonable 5k or so photos to put into albums over few years of retirement.

tomek_ycomb··on Study puts fermented foods, not fire, as pivotal moment in human brain growth
No, kvass and other 'fizzy drinks' are not kombucha

They get their fermentation from the air, ferment much lower, and do not rely on the skoby to keep it all working. On some level there is similarities, but its not the same

tomek_ycomb··on Ahead of IPO, Reddit blends advertising into user posts
I don't think that is the same, because the ad is clearly not the video, as opposed to seeing the video while thinking it was the video forst
tomek_ycomb··on Ship faster by building design systems slower (2023)
I'm not sure, is Autodesk a good answer? Wouldn't they be in the business of design and perhaps not a standard company that shouldn't do custom? Maybe I misunderstood the point though!
tomek_ycomb··on As solar panels age out, recyclers hope to cash in
I think it's an argument for adding just the number you need to compensate for the power loses

Otoh I think people are forgetting there's a point where the maintenance gets to be more

tomek_ycomb··on I don't think the cheapest APC Back-UPS units can be monitored except in Windows
100% agree, but have never had $1k to drop like that on a backup dedicated to my PC ;p.
tomek_ycomb··on Understanding Wood Bonds – Going beyond what meets the eye [pdf] (2018)
As it stands the turbine blades are pretty much peak athletes. There's extremely little room for less than the perfect material in the mega turbines.

A lot of people look at the mega turbines because the bigger the turbine is, it reallllyyy tends to increase the scale of power you can get.

Maybe there's some auxillary value not to overlook wood tree smaller turbines (maybe for land use where harder to do mega turbines?) But I would imagine the peak material performance issue will restrict lumber from the mega turbines

tomek_ycomb··on What is trauma? The author of "The Body Keeps the Score" explains [video]
It's not entirely clear from a brief Google what behavior extinction is.

However, I don't really think this is particularly parallel let alone same as any sort of prescriptive process for reward/training which the brief search on Google suggested behavior extinction is about.

I'm not going to totally deny that there are any parallels between any behavior reinforcement mechanism m, but I'd sooner redirect to reading more about body keeps score before making the parallels to another concept (in this case)

tomek_ycomb··on UPSes suck and need to be disrupted
Poster said power density, and I don't really believe theyre' right (see:a123 batteries, and now there are plenty of competitors)

However that's different than you're saying, which is about energy capacity.

I believe they are mistaken because many lfp replacement batteries have BMS units that are usually the limiter. But you can also buy lfp starter batteries

tomek_ycomb··on Summary of “The Procrastination Equation”
These are good ideas in my opinion, but somewhat came through to me as a little bit laden with judgement and negativity.

That might work well for you, but I have only been able to work on these things through a relatively shame-less perspective, and have found progress there. Just pointing it out there for anyone who like me may have kind of liked and disliked your reply

tomek_ycomb··on Summary of “The Procrastination Equation”
This is 100% not just you. Procrastination for many people in an avoidance mechanism of sorts related to anxieties.

New York times article on procrastination was pretty nice called "why you procrastinate"

tomek_ycomb··on Building a DIY Pen Plotter
A sponge is the inkwell you want :) micro-baffles
tomek_ycomb··on 12,000-year-old realistic human statue was unearthed
The incentives are that the person who discovered the previously oldest <12,000 island that defined their archeological site as the coolest site, tends to fight. That plus 3rd party dating and other solutions. Because sometimes there is not a lot to go off of for dating, I've also seen people complaining that samples aren't always shared. So it's not perfect for sure, but I'm noting there are still incentives in that system
tomek_ycomb··on Focused Ultrasound
Ultrasonics have been used for kidney stones for a while, too. But, this is something different as noted elsewhere
tomek_ycomb··on Influence of dietary lipid upon ultraviolet light-carcinogenesis
Alternatively oxidizing is the act of taking on the oxidative damage for you
tomek_ycomb··on Multiple Nation-State Threat Actors Exploit CVE-2022-47966 and CVE-2022-42475
Uhh, I think you mean legal criminal organizations. Which, you believe should be illegal.

I mean, maybe you meant illegal, in the sense that they are not always in clear legal status (e.g, NSA doing illegal things), but I think for the reader "legal criminal organizations" makes more sense to the point.

Another way to write it maybe would be "sanctioned criminal organizations" but that would be confusing with the secondary meaning of sanctioned. Oh language :(

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