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coke posted:this is the one i remember from the last wood posting  Just use an axe dude
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Sep 14, 2019 15:49
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I know posting Kreosan is like using OSHA cheat codes, but I still feel like this belongs here. https://www.youtube.com/watch?v=B62Zpy9z72g
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Sep 14, 2019 16:41
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PostNouveau posted:
what am i a peasant? sweat my own sweat??
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Sep 14, 2019 16:58
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Rust Martialis posted:How the gently caress did they trigger a loving quench on that Bruker 500 I'm not sure. They were refilling the unit when it quenched. The air system is venting it outside. The oxygen level alarm went off about a minute after the quench started and only kept going for about 3 more. That's fast enough that someone who tripped and knocked themselves during the evacuation wouldn't suffocate. That power in an air re-circulation system isn't cheap, but it's designed against all three NMRs quenching simultaneously. Which would be deafeningly loud. We have a lot of Very Serious HVAC on campus. My building for example has the Process Virology labs which are on a negative pressure system. Because of that we also have a vastly oversize backup generator to keep that, and the attendant alarm system, running during a power outage. I'm not sure of the exact rating, but eyeballing it I'd say you could run a small submarine or three 12 story apartment buildings off of it.
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Sep 14, 2019 17:54
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I hope they have more than one generator, one backup generator is essentially no generators in my experience.
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Sep 14, 2019 18:06
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mllaneza posted:I'm not sure. They were refilling the unit when it quenched. Really learn to appreciate HVAC in this profession.
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Sep 14, 2019 18:31
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Just surprised they rely on that instead of venting it directly to the outside, via pipes.
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Sep 14, 2019 20:31
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shovelbum posted:I hope they have more than one generator, one backup generator is essentially no generators in my experience. We have a back up generator and it has failed every single time they tested it. When we had a real power outage it didn't work, either.
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Sep 14, 2019 20:54
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tactlessbastard posted:We have a back up generator and it has failed every single time they tested it. When we had a real power outage it didn't work, either. Sounds like your testing was spot on.
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Sep 14, 2019 21:04
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Just don't put all your backup generators in the basement like they did at Fukushima
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Sep 14, 2019 21:19
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See what you do is continue as normal knowing the backup doesn't work, then schedule a test which must be carried out regardless of conditions, even if it means putting your equipment in a dangerous state it was never designed for. Absolutely nothing could go wrong, it's just a test!
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Sep 14, 2019 21:38
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FuturePastNow posted:Just don't put all your backup generators in the basement like they did at Fukushima They should've used RBMK reacters at Fukushima. They could never explode or melt down
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Sep 14, 2019 21:39
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My workplace keeps the building's (diesel) backup generator directly between our CNG forklift fueling station (which is right beside where the natural gas connects to the building) and our thirty foot tall propane tank. At least we know it works, since it runs a 30-minute test every Sunday.
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Sep 14, 2019 22:06
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shovelbum posted:Just surprised they rely on that instead of venting it directly to the outside, via pipes. Would have to be titanium pipes or plastic. Anything ferromagnetic near an 11.7T magnet is Not Advised. Even though the field outside the casing is relatively weak. The magnets are also averse to vibration, random EMF sources, and anything large and ferrous (cars, trucks) moving nearby outside, as the probes are very sensitive, and maintaining a homogeneous static magnetic field is critical. So you tend to have a clear space around them. Pipes would be wierd, and probably make the magnet vibrate unacceptably.
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Sep 14, 2019 22:15
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Rust Martialis posted:Would have to be titanium pipes or plastic. Anything ferromagnetic near an 11.7T magnet is not advised. Even thought the field outside the casing is relatively weak. See also: MRIs in hospitals.
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Sep 14, 2019 22:16
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Mustached Demon posted:See also: MRIs in hospitals. MRI have a weaker field, but its bigger. The sample holder in the NMR machine is buried out of harm's way, and the field outside the magnet casing is really not THAT strong even on a 750 MHz machine. You can resist it. The cavity on an MRI is an inch across, an MRI has to fit a human.
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Sep 14, 2019 22:20
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Rust Martialis posted:MRI have a weaker field, but its bigger. The sample holder in the NMR machine is buried out of harm's way, and the field outside the magnet casing is really not THAT strong even on a 750 MHz machine. You can resist it. I was more talking about ferromagnetic stuff around the giant, gently caress off magnet.
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Sep 14, 2019 22:22
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mllaneza posted:This is what tens of thousands of dollars of liquid helium boiling off looks like. This reminds me of the time I was in a datacenter when there was an FM200 discharge, kind of like a crazy fog machine where it doesn't dissipate. The DC was quite the OSHA experience overall. Crawling under raised flooring next to more or less exposed 480V connectors, shaky ladder-racking above holding way too much weight of cabling. Their generator failed once so they trucked in some mobile ones and snaked cables from the battery room outside to the portable gensets. Remarkable nobody was electrocuted in there. Good times during the dotcom bubble!
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Sep 14, 2019 23:07
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Crawling around under raised floor is the best. Especially when the real floor is 10-15 feet below the raised floor. People get a real kick out of seeing someone walk into their work center, pop a floor tile and disappear into an abyss.
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Sep 14, 2019 23:19
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Gunshow Poophole posted:what am i a peasant? sweat my own sweat?? lol if you don't have your manservant Enrique fan you while you split wood with your $400 axe from a designer boutique while glamping
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Sep 15, 2019 00:23
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The true glamping style is to take several minutes and a dozen swings to split one log (poorly) and then dust off your hands and leave the rest to your manservant.
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Sep 15, 2019 03:18
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Cojawfee posted:Especially when the real floor is 10-15 feet below the raised floor. Isn't it just a whole separate floor at that point?
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Sep 15, 2019 03:26
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Jabor posted:Isn't it just a whole separate floor at that point? In a normal world it would I guess. But this was a repurposed manufacturing facility, and this part of the building used to be over a pit.
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Sep 15, 2019 03:35
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Did that Russian/Ukrainian youtuber that would take apart microwaves to make ray guns etc ever blow himself up
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Sep 15, 2019 03:53
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The Wiggly Wizard posted:Did that Russian/Ukrainian youtuber that would take apart microwaves to make ray guns etc ever blow himself up Funny you should mention that, wasn't there a vid of him working with Sappers in Ukraine to identify explosive traps posted in here last week?
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Sep 15, 2019 04:06
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Icon Of Sin posted:Until they get a log full of ants. Bravo
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Sep 15, 2019 04:23
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How about this guy digging up old munitions for scrap copper https://youtu.be/gGM8qYU69TY?t=899
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Sep 15, 2019 05:01
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coldpudding posted:How about this guy digging up old munitions for scrap copper https://youtu.be/gGM8qYU69TY?t=899 Oh gently caress, these dudes had gopro? ReelBigLizard posted:It's not the worst way, probably the worst case is similar to the above though - It doesn't work and now you have a device in an even more potentially dangerous condition.
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Sep 15, 2019 07:25
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ewiley posted:The DC was quite the OSHA experience overall. Crawling under raised flooring next to more or less exposed 480V connectors, shaky ladder-racking above holding way too much weight of cabling. Who came up with the raised floor datacenter? We used to have them and in hindsight they were such a stupid idea compared to running the cabling overhead, preferably in advance and using patch panels.
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Sep 15, 2019 13:28
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Rust Martialis posted:MRI have a weaker field, but its bigger. The sample holder in the NMR machine is buried out of harm's way, and the field outside the magnet casing is really not THAT strong even on a 750 MHz machine. You can resist it. Wait, I thought NMR and MRI were literally the same thing, just rebranded because hospital patients didn't like the word "nuclear"?
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Sep 15, 2019 15:30
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haveblue posted:Wait, I thought NMR and MRI were literally the same thing, just rebranded because hospital patients didn't like the word "nuclear"? Different scales, nmri they are talking about is 11+ Tesla human scale mr is 1.5 or 3 Tesla generally. Also samples are different sizes, human versus tiny tinny things.
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Sep 15, 2019 16:04
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Saukkis posted:Who came up with the raised floor datacenter? We used to have them and in hindsight they were such a stupid idea compared to running the cabling overhead, preferably in advance and using patch panels. It looks cooler.
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Sep 15, 2019 16:31
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Jesus
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Sep 15, 2019 16:35
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tactlessbastard posted:We have a back up generator and it has failed every single time they tested it. When we had a real power outage it didn't work, either. I was working at an institute that had two power outages on consecutive weekends. The first time the generator came on. The second time it didn't. Turns out it had to be reset after coming on or it wouldn't emergency start again, but no one knew this because there was no documentation from it's installation 30 years ago
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Sep 15, 2019 16:46
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Saukkis posted:Who came up with the raised floor datacenter? We used to have them and in hindsight they were such a stupid idea compared to running the cabling overhead, preferably in advance and using patch panels. Raised floor datacenter main benefit is for cooling.  We have one at work but still run cabling overhead.
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Sep 15, 2019 17:15
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Yes, NMR and MRI are the same idea. The need to keep the field absolutely constant (in parts per million) across the target gives rise to problems, and why MRI uses contrast agents. In MRI you are looking at 1H nuclei (aka 'proton') in water in tissues in lumps/organs, the local magnetic field varies in different tissues due to chemical effects. So liver looks different from kidney from fat. The concentration of proton nuclei in water is huge, the signal is massive. In NMR you hate water. It obscures your compound at millimole concentration. You are looking at methyl, amino, etc hydrogen nuclei. For biomolecules anyhow. So the suppression of water signal is a huge problem, so you dissolve your compounds in D20 or other ways.
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Sep 15, 2019 17:17
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loving hell, don't leave a bus parked on a rail crossing. https://www.youtube.com/watch?v=NgK8K6rr5Pc
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Sep 15, 2019 17:38
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haveblue posted:Wait, I thought NMR and MRI were literally the same thing, just rebranded because hospital patients didn't like the word "nuclear"? Most radiology departments have an area called nuclear medicine.
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Sep 15, 2019 18:17
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coke posted:this is the one i remember from the last wood posting he made a lathe partially from treadmill parts https://www.youtube.com/watch?v=EZPIVKi8J4s
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Sep 15, 2019 18:43
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Sep 15, 2019 21:31
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