Shut up Meg posted:

Just FYI, that was fatal.

Aramoro posted:

People go on the internet and just tell lies?

https://www.mirror.co.uk/news/uk-news/paratrooper-falls-death-horror-crash-13231508

Zarin posted:

What's all the dark stuff flaking off with each hit? Surely there can't be that much slag in that chunk of iron . . . ? I certainly can't think of what else it might be, though; I don't think pieces of iron/steel would be coming off like that.

BattleMaster posted:

that's obviously really bad for stochastic effects (random poo poo with probability of happening increased due to exposure, like cancers)

Jonny Nox posted:

Therac-25 and radiation therapy machines are a completely different beast to CT.

Radiation therapy is designed for therapeutic doses, ie enough to change how your body works. I don't work on them but my understanding is that the radiation source is generally fissible material like iodine isotopes, I assume because you want that sweet particle radiation. Therac-25, and that Brazilian town I can't remember how to spell were both this kind of machine. They can delivered dangerous doses because they were designed to.

CT is a glorified X-ray machine. It's source is an x-ray tube which works much like an incandescent lightbulb, except you can control the wavelength and density of the photons it emits. The radiation it emits is electromagnetic radiation which is like visible light, but on a much higher wavelength.

Yooper posted:

I've designed some industrial UI along with industrial control systems and used a whole slew of them. There seems to be zero standards for generic industrial use. UI design takes backseat to function even if it should be easy to use. Usually people handwave ease of use and just say "it's industrial".

Aramoro posted:

Cannons were for attacking fixed positions.

quote:

Oh, boy.

Now I have to explain the absolute Greatest Moment in Wacked Out Real Science.


Couple years ago, some people I worked with finally completed a long-delayed
project to build a very large vacuum chamber for testing plasma thrusters and
other advanced spacecraft propulsion systems. Not the biggest in the business,
but maybe top ten nationwide. Big enough to walk around inside, at any rate,
which is the important point.

Important, because in order to go operational it needed the approval of the
local Safety Nazis. You know the type. They have a checklist, nay, a whole
handbook of checklists, one of which involves Confined Spaces. Big enough
to walk around in? Check. Airtight? Check. Can be filled with asphyxiant
gas? Well, the MSDS for "Vacuum" apparently lists it as an "asphyxiant", so
check. It's a Confined Space, and so the Confined Space checklist must be
implemented.

Issue the first: How do they make certain nobody can accidentally walk in while
the chamber is full of that deadly asphyxiant, "vacuum"? No, the fifty *tons*
of force holding the door closed, is not an acceptable answer.

Issue the second: When the chamber is vented back to full atmospheric pressure,
where does the vacuum go? If the chamber were accidentally vented by opening
the door (see above, and note exact Safety Nazi quote, "OK, say if you were
Superman and you opened the door"), where would the vacuum go?

Issue the third: What assurance is there, that when the chamber is vented back
to full atmosphere, there is an adequate percentage of oxygen in the chamber?
Hint: It is a big, big, big mistake here to acknowledge here that the laws of
statistical gas dynamics allow for one chance in 10^10^17 (no typo) that the
chamber will spontaneously refill with a sufficiently oxygen-poor atmosphere
to preclude respiration.

Issue the forth, and so help me God I am not making this up, again an exact
Safety Nazi quote, "How can you be sure there won't be vacuum pockets left
in the chamber, that someone could accidentally stick their head into?"

And, coupled with issue #2, there could be deadly vacuum pockets floating
around the lab! Aieeee!!!! Run for your lives!

It only took three weeks to find someone with the common sense and the real
authority to overrule the Safety Nazis on this one, and the SNs still take
offense if anyone brings it up in their presence.

Vacuum pockets.

Boiled Water posted:

Isn’t jewelry like money in banks insured?

quote:

In the class recorded for “Do Not Resist,” Grossman at one point tells his students that the sex they have after they kill another human being will be the best sex of their lives. The room chuckles. But he’s clearly serious. “Both partners are very invested in some very intense sex,” he says. “There’s not a whole lot of perks that come with this job. You find one, relax and enjoy it.”

Pile Of Garbage posted:

Basically. Things that had nuclear warhead options in the Cold War:

[list]
[*]MANPADs (Man-Portable Air Defence missile systems like Stinger)
[*]Backpacks (W54, only 27kg and about the size of a wastebasket)

chitoryu12 posted:

Fumble posted:

its like a guy up a tree with a chainsaw for a while then boom out of nowhere crane to the head.

Methylethylaldehyde posted:

Any hit that penetrates a MBT tends to kill the crew,

Mister Speaker posted:

I'm looking for a GIF or video and this is the best place to ask. Near as I can remember, it's of three large power conduits that are wrapped in a helix, and because of... something to do with the current running through them, I want to say it has something to do with three-phase power, the cables are actually physically flexing around one another.

Am I imagining things or is this out there? Can anyone explain why that happens?

gently caress SNEEP posted:

I'm professional drone photographer Tim Drone.

Platystemon posted:

For anyone who hasn’t seen this, skip to a few seconds before seven minutes for the money shot.

Platystemon posted:

The FAA can’t use Jerry’s videos against him

Platystemon posted:

I can’t find that paragraph on the current site, and IANAL, but as I understand it, they can use video, they just can’t use it alone.

If someone had, say, watched Jerry do his attack run on the Bay Bridge through a pair of binoculars, the video could be introduced to corroborate their testimony.

Platystemon posted:

Thanks. I knew there were exceptions in the rules of evidence large enough to drive a (Swift) truck through and that that probably fell under one of them.

It’s weird for the FAA to falsely hide behind the rules of evidence. Maybe they’re envisioning someone other than the pilot as the videographer, but so what? Find who the videographer is and subpoena them. Isn’t safety investigation the FAA’s job?

quote:

First, FAA inspectors are being reminded they have "no authority to direct or suggest" that a flying video you posted on the Internet be removed, according to the new policy. It's your First Amendment right to upload any video you want. Safety inspectors are also being reminded by top agency brass that a video alone is "ordinarily not sufficient evidence" to determine whether any FARs have been broken. A video purporting to show something legally questionable must also be "authenticated" by the FAA inspector before any enforcement action is taken.

The FAA crafted the policy after one of its safety inspectors sent a threatening letter to the owner of a remote-control quadracopter who filmed beachgoers from on high in Florida a few months back. There was nothing particularly dangerous about the flight or the filming, but because the UAV owner posted the video to YouTube, and because YouTube is a for-profit website that shows ads and gives uploaders a few pennies or dollars for their trouble, the flight had crossed the line into a "commercial operation," this inspector warned.

quote:

In all cases, the FAA must have acceptable evidence in support of all alleged facts
in order to take legal enforcement action. Inspectors are reminded that:

Electronic media posted on the Internet is only one form of evidence which may be used
to support an enforcement action and it must be authenticated;

Electronic media posted on the Internet is ordinarily not sufficient evidence alone to
determine that an operation is not in compliance with 14 CFR; however, electronic media
may serve as evidence of possible violations and may be retained for future enforcement
action; and

Inspectors have no authority to direct or suggest that electronic media posted on the
Internet must be removed.

Source4Leko posted:

That ferret died because someone left the heat off in a barn over a weekend. The lab wouldn't let them get another ferret.

Platystemon posted:

making GBS threads on pandas for being bad at eating bamboo is like making GBS threads on fish for walking on land.

Platystemon posted:

It’s a knock‐on effect of their diet.

Being bad a loving is a compensation mechanism.

It’s better than having more children than they can nurse because there’s only so much energy the mother is getting from bamboo.

Platystemon posted:

If you were sedated, kidnapped, and put in a zoo, you might find it hard to get it up, too.

Bad Munki posted:

https://i.imgur.com/trutTZo.gifv

Mr. Apollo posted:

Rime posted:

It's OK, I ratchet strapped them really good.

grillster posted:

That car has 98,032 Eagle Power, going by the standard average horse to bird weight ratio conversion.

Tim Thomas posted:

let's talk a little bit about ion implant and how electrostatics work and how they both like and hate each other

-in order to accelerate a particle you have to run it through an electric field
- since fab space is expensive, the optimal implanter is infinitely small, which means that your field is infinitely big
-in general, electric fields break down in air somewhere between like 50 kV and 75kV per inch and something like 30 kV/in along a surface

Brute Squad posted:

ground effect.

Proteus Jones posted:

That is some huge brass balls level of flying.

JingleBells posted:

This is why you wear the correct PPE when riding a motorbike:
https://www.youtube.com/watch?v=XUK16hxemKA
He lived:

chitoryu12 posted:

With guns? Depends. If it’s a pistol most holsters cover the trigger so nothing can snag it, so it’s technically safe as long as you don’t do a Tex Grebner. With a rifle? Hope you’re not walking through a jungle getting stuck on branches and vines.

Memento posted:

Also my understanding is that if it wasn't for the fact that HFCs were there, and could be used as cheaply as CFCs, the refrigeration industry would still be using them to this day and kicking and screaming the way oil companies are.

MRC48B posted:

The trump admin started make noises about reversing the various reefer bans, until the lobbyists shut it down hard.

They make more money on R-22 banking and 4 series refrigerants and equipment than they ever would of got without Montreal.

CRUSTY MINGE posted:

No, this is the one where the fire department comes to put out the fire on the fence because the neighbors were paid up, but let this familys' house burn because of a $75 fee that wasn't paid.

Sagebrush posted:

Anyway re. the fire, I'm sure that if Tennessee wants to stay in their libertarian hell world of paying no taxes and hiring private fire departments,