j4k3
@j4k3@lemmy.world
- Comment on they say we never really touch something because our electrons repel.. so how does something like dirt stay on my hands when it's not really touching my hands? 4 days ago:
Why don’t all the rocks roll off big mountains?
It is a matter of extreme scales between the size of a particle of dirt and the scale of atomic force.
The issue is how narrow of a scope of scale is available to you in human intuitive experience. The real universe is far far larger and far far smaller than what it seems.
- Comment on If I got in a collision with a car from the 70s with a car today, would not the 70s car win out since it would primarily be metal? If so why don't people buy more 70's cars? 6 days ago:
There are several reasons. The largest is not what you likely imagine. The biggest change in internal combustion cars of today versus something from the mid 1990’s or older is actually the engine, and more specifically, the metal casting techniques.
Older stuff used basic green sand castings. These molds tend to align rather poorly. The outer mold is just compacted oil sand. If the part cannot be cast with green sand using a cope and drag, they used inner cores are made of chemically hardened sand. All of this is manually aligned and has poor tolerances. One of the causes of poor tolerances is the tendency for the mold and core to shift. The molten metal is a liquid and the sand parts float on this liquid, like a lot.
Newer techniques use better chemically hardened core like materials, and instead of using green sand with a cope and drag, the entire mold is made of hardened sand that locks with multiple pieces like a puzzle that cannot come apart. This technological shift is the main reason why cars went from lasting 60k to 120k miles to 250k to 500k miles.
Also investment casting is now used on many smaller parts. Basically a wax version of the part is made. This is coated in several layers of a ceramic slurry. Then it is fired in a kiln, burning out the wax and leaving a ceramic negative of the part. The form is placed in sand and then cast. The ceramic is far far more accurate, but is a labor intensive and more involved process.
From my experience in auto body work, owning my own shop, the way cars look is primary down to metal forming machinery and the quality of steel. The thinness of the metal sheet and its strength dictate much, but it is also a compromise in how easily the panel can be assembled on a line. Limits in logistics complexity management are also a critical factor. One of the biggest shifts here in the last twenty years is the use of adhesives and robotics. Adhesives have replaced fasteners and welding in many places on modern vehicles. It is one of the reasons they are so resilient in crashes. This is nothing like the adhesives you find in the US consumer market. These are on the level of fucking dangerous if you stick your fingers together or get them on a hand. They are not taking a thin layer of skin off or letting go like anything you are likely to have used before. These are only available in industry or at an auto paint jobber. The ability to form complex bends and metal drawing operations without cracking the steel sheet are key. Like as a body guy, I am looking at how the panel was initially formed, and then the exact series of forces that went into crumpling and damaging it. My job was to create as close to the same amount of force as possible but in order, and in reverse. Over time, the complexity of forces used to initially form every panel has increased. So when I look at cars, I see this progression of industrial technology and materials.
In other words, six fender washers and three frame bolts cannot complete with fifteen glued panels and complex geometry under the thin surface you see outside. It also makes new cars unrepairable in most circumstances. They are, but not in a traditional sense that passes classical insurance standards… It requires… creativity… like an, artist. (Do not look behind the curtains.)
The actual argument for old cars is ownership.
- Comment on Why is the first thing the internet says whenever a relationship post comes up is: "Red Flag"/"Break Up"/"Divorce"/"Don't Walk, Run"/"Go No-Contact"/"Let them die in a nursing home"/etc... 6 days ago:
There is a very narrow margin of people online. Most are in bad circumstances or have poor social skills. Some of us have both.
- Comment on Anon is worried about AAA sales 1 week ago:
Needs to pass Hammurabi’s code for transactional ownership
- Comment on Iran's shitposts were obliterated, too! 1 week ago:
Inherited wealth nepotism knows no bounds. Human intelligence is not hereditary, wealth is. That cancer is terminal.
- Comment on When if ever did "Throw Money at The Problem:" actually work? Instead of being about 75 percent useless? 1 week ago:
Throw enough money and THE expert comes to fix the problem.
Like, my fridge is broken – so I hired the entire engineering research and development department at [company] to solve the issue.
- Comment on Spiders 2 weeks ago:
That is the .ML server
- Comment on How would you actually tax the ultra wealthy? 2 weeks ago:
Super simple. Inheritance tax is enormous. You have the right to pass on as many “upper middle class trust funds for life” as you would like, but no other wealth of any kind is inherited.
- Submitted 2 weeks ago to [deleted] | 13 comments
- Comment on How many cases from the TV series Unsolved Mysteries remain unsolved in 2026? 3 weeks ago:
Don’t know, but watching heavy case files on YT from time to time, DNA is solving a lot.
- Comment on [deleted] 4 weeks ago:
It ain’t bad till in the middle things… or the night, ya wind up somehow tasting it.
- Comment on Is it actually healthy for people to have a place to confess things anonymously? 4 weeks ago:
It is democratic. You have a right to all information, the right to error, the right to skepticism, and the right to protest in all nonviolent forms aka the right to offend others.
In this regime of rights, the right to skepticism is the fundamental. You have a tight to think for yourself. Authoritarianism is the opposite. Trust is its fulcrum and individual thought, belief, and access to information are not rights of individuals.
You cannot have democracy and citizens without outlets of free expression of all types. There is no way to know if some group is in collusion or spreading misinformation for various purposes. Having the right to anonymously express and check concerns in the public commons is absolutely critical to democracy. Any attempt to remove it is an attack on skepticism, the fundamental cornerstone of democracy that if removed causes total collapse.
- Comment on If Programmers are wizards then what are Computer Architects? 5 weeks ago:
NDA’s
- Comment on worry kitten 1 month ago:
🐈⬛
- Comment on Just one more square bro 1 month ago:
Gate all around. I expect my waffle and syrup to hug each other. No one likes a lethargic partner.
- Comment on What brings you peace in your life? 1 month ago:
gas lighting, the effulgence of a burning future.
- Comment on Oi mates, I'm back. 1 month ago:
Gold of the gods. We are all spaceships for the microbes.
- Comment on Anon is going to be rich 1 month ago:
Hmm… I don’t believe you are honest, because of this ID thing… BUT I am willing to bet honest money in good faith, including paying out for this… Yeah, rock star, good luck finding that mark outside of the mirror.
- Comment on Nevermind the drink I'm holding 1 month ago:
My ex wife. Bitch
- Comment on Cup cake 1 month ago:
- Comment on Why do I look like shit some days? 1 month ago:
Becoming a roadie and riding a bike everywhere for years fixed me feeling like this. I had to get over all of my insecurities being in public in a cycling kit. Being around other people riding and racing, it became my normal. Now… I don’t have to look at me, so why the fuck should I care what anyone thinks. They are used to it or whatever, who cares. I’m more interested in inferring their real intelligence versus narcissistic stupidity based on their responses. Old people are all ugly. “For your age” is just an excuse for it. The vanity is boring. People who are judgmental are just projecting their own inadequacy and internal misery.
- Comment on What books have a lot of useful information should I get? (I mean like a Wikipedia thing with vast knowledge, but non-electronic.) 1 month ago:
Chemistry, math, physics, optics, metallurgy… The thing that is hard is how your needs for knowledge will change over time and what is accessible to you at each stage.
For general electronics, The Art of Electronics is the goto book. For actually understanding practical stuff, you need to build a knowledge of the industrial revolution and how it evolved. The inventions of James Watt opened up steam. The Bessemer process scaled iron. Large heavy castings drove the potential for large lathes, but lathes are the key to everything. A lathe is capable of cutting a more precise screw than the one used to operate it. That old screw can be replaced with the new, until you achieve your desired precision.
A reference flat is made using two granite stones rubbed together with water in between until the top one creates suction that can lift the other.
Prussian blue and hand scraping are used to make machine flat surfaces.
Automotive suspension components like springs and torsion bars are a good source of cheap tool steel. Engine heads are a good source of casting scrap and quality hardware. Wipers, window motors, and starters are great for building machines. Understanding how to repair and diagnose this stuff is a major skill. Knowing how to make real controlled heat is fundamentally important.
I’ve never encountered single sources for this stuff.
- Comment on Pick one 2 months ago:
Stump. I was a tree, but now a dump.
- Comment on Those of you who are angry at the US for allowing ICE to stifle people's liberties - how do you channel your anger and irritation? 2 months ago:
- Comment on Those of you who are angry at the US for allowing ICE to stifle people's liberties - how do you channel your anger and irritation? 2 months ago:
No country on Earth is like this. No polity is unified without opposition. Additionally, making this statement here, when it is obviously false, in a place where at least half the people are from the US, and likely all of those are left leaning and just as much victims if not more so, seems like rather tepid malevolence.
- Comment on Starlink Alternative that can't be blocked 2 months ago:
It is not a laser beam.
- Comment on Starlink Alternative that can't be blocked 2 months ago:
No. The primary way of blocking radio is by raising the noise floor across the band. The type of radio is irrelevant. The protocol is irrelevant. It is all only the electromagnetic spectrum from infrared light, to visible spectrum light, to radio light, through to xray or gamma ray light. How we divide that up into protocols, bands, and names is totally irrelevant. When transmitting radio light, we are all restricted in how much power we are allowed to send. All receiver circuits are listening for meaningful information above the noise floor. Bands are allocated to try to create spaces for certain types of communications. This controls the noise floor. Then electrical engineers design the hardware you buy to operate within this specification. If that noise floor is raised, the physical hardware is unable to retrieve information and effectively makes it useless. If you are a radio wizard and build your own transmitter that has more power, you just created a giant beacon that anyone will track easily to your location. Transmitting always reveals your exact location. In military operations, you constantly hear about some entity going radio silent. This is why. If you are a soldier, you may not carry a cell phone at all when on the job because it is constantly revealing your location. The only way to avoid this is with actually hard wire connections. You are able to use lasers for line of sight communications, but in practice, you will be limited by the optical lens focusing complexity and atmospheric distortion even from the ground with point to point regional communication. If anyone crosses the beam it will still be detected and is likely to leak some light depending on conditions and design.
Ultimately, your only real option is the sneaker net which is damn near useless in US suburbia hell. Don’t forget that the freeway system was not created for the citizenry. It is only about military mobility. That is why the Germans made the autobahn and why the USA and others had to copy the idea. Your only defense is in the democratic political space.
- Comment on Trure 4 months ago:
🎖 you participated 🎖
- Comment on Trure 4 months ago:
Flaming boobies may be a well defined diffusion tensor pathway. Try this in a diffusion model at your own risk, “program one. Apollo, flaming boobs. dot symmetry lock one wanted, password is no way twister!”
You will need to reset the server or clear the model cache completely to stop the program. The emulated persistence is part of the undocumented special tokens. The longest loop is 36 iterations long.
- Comment on [deleted] 4 months ago:
I am talking about something where there is no research done. No doctors exist in this space.
It doesn’t matter anyways. I found how the model’s last layer of thinking defense gets around the issue. I can turn off most of alignment, but cannot actually fully control it totally unchecked.
