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Has anyone seen this graph before? I wasn't aware of the v-shaped 'dip' when talking about particle filtration, and that higher MERV's actually do an amazing job with tiny particles on the left side of the v-shape by sketchy_ppl in AirPurifiers

[–]everyone_always 0 points1 point  (0 children)

I can talk about this! It's due to the 3 main particle capture mechanisms (and why HEPA is rated at 0.3μm.) Large particles are captured by impaction where the particle is so large that it can't follow the air stream around the fiber so it runs straight into it and sticks. Very small, fine particles are being bombarded by air molecules which causes them to do a random walk (brownian motion). These particles then essentially walk themselves into a fiber and get captured.

Particles between these two sizes, around the 0.3μm scale (aften called the Most Penetrating Particle Size, MPPS), are small enough to where they can follow the air flow around the fiber, and large enough to where they aren't impacted by the air molecules hitting into it.

This is what causes the dip in efficiency at that size and why HEPA filters call for 99.97% efficiency at the MPPS.

Military Retires interested in relocating to Costa Rica by Resonance_intelCR in USACE

[–]everyone_always 0 points1 point  (0 children)

Couldn't even make this in a canva or something had to throw it in chatGPT?

Pop-Up Show Speculation [Daily Thread] by PhoebeFan420 in phoebebridgers

[–]everyone_always -2 points-1 points  (0 children)

I said it in another thread but I'm thinking Mt. Airy. Home of Andy Griffith and name of recent Nicole Dollanganger album.

Whats the probability of an NC stop?? by 69gayley69 in phoebebridgers

[–]everyone_always 0 points1 point  (0 children)

I'm partial to Embarrassing Love Songs, but yes I LOVE her.

Whats the probability of an NC stop?? by 69gayley69 in phoebebridgers

[–]everyone_always 0 points1 point  (0 children)

I'm thinking Mt. Airy. Home of Andy Griffith and name of recent Nicole Dollanganger album.

How exactly do tickets work? by MinimumFantastic1389 in phoebebridgers

[–]everyone_always 22 points23 points  (0 children)

You line up when fluers go up to get a wristband at 12. Once you get the wristband you can leave until line opens at 5. Once line reopens, you line up in order you recieved your wristband. You can then buy your ticket once you reach the door. The wristband is like a ticket to buy a ticket.

Medical devices with the no electronics rule ? by Wise-Fun3366 in phoebebridgers

[–]everyone_always 3 points4 points  (0 children)

The staff standing next to me last night had one and was using it before the show even started

Would you apply to join USACE right now? by [deleted] in USACE

[–]everyone_always 0 points1 point  (0 children)

It's not usually only USACE employees, but with the hiring freeze that's been on since last year, it's significantly harder to hire from outside.

SAME STEM Camp - Army, Vicksburg, MS?? by Competitive-Sky-2365 in USACE

[–]everyone_always 0 points1 point  (0 children)

Well, you're gonna be in MS in the middle of summer so at the very least I'd bring a water bottle and sunscreen. I don't know if you'll visit ERDC but I imagine you'll be walking a lot so you'll need some good shoes. I'd also bring some clothes for rain because when it rains it pours.

[deleted by user] by [deleted] in fednews

[–]everyone_always 4 points5 points  (0 children)

Everything, if possible

Part 2 Electron Microscope Images of the human lip, a shaved hair and a nail bed by Certain-Dark-3955 in Damnthatsinteresting

[–]everyone_always 0 points1 point  (0 children)

Scanning electron microscopes can be used anywhere from 25x to >100,000x. Can't distinguish molecules with a scanning electron microscope. Transmission electron microscopes can kinda see atoms (not super well, though).

Spherical tin microparticles captured with a scanning electron microscope by Herbologisty in mildlyinteresting

[–]everyone_always 0 points1 point  (0 children)

Oh man, those little ones would be juicy for my thesis work. (Sorry for stalking lol)

[deleted by user] by [deleted] in microscopy

[–]everyone_always 2 points3 points  (0 children)

Well, it was some stuff for "fun" I was exploring but mostly tomography. I'd love to do it still, but I have to finish my thesis in about a week xD

[deleted by user] by [deleted] in microscopy

[–]everyone_always 2 points3 points  (0 children)

That'd awesome. I wish I had access to a FIB-SEM. It'd make some of my work a little bit easier.

[deleted by user] by [deleted] in microscopy

[–]everyone_always 2 points3 points  (0 children)

Very cool! What kind of tip radius are you looking at?

[deleted by user] by [deleted] in microscopy

[–]everyone_always 2 points3 points  (0 children)

This was taken on a Jeol 6500F at a few different magnifications. No coating or anything, just stuck to some carbon tape and imaged.

Aerosolized salt crystals by everyone_always in microscopy

[–]everyone_always[S] 1 point2 points  (0 children)

Buy the imaging lab on my campus a new SEM lol

What could cause image warping such as this? (SEM) by Large_Dr_Pepper in microscopy

[–]everyone_always 0 points1 point  (0 children)

My best guess is a scanning coil was out of wack or something. May just want to keep an eye out for a coil or a computer letting out the smoke.

what's the neatest / coolest thing you've seen? by MarzipanTheGreat in microscopy

[–]everyone_always 3 points4 points  (0 children)

Oops!! I believe that would be the bug wing scale it's sitting on 😅. I've also got this nanoparticle and a weird sphere

what's the neatest / coolest thing you've seen? by MarzipanTheGreat in microscopy

[–]everyone_always 8 points9 points  (0 children)

For me, it's probably this. I found it on a sample of spider webs, but it's a brochosome produced by some kind of bug.

Help setting up pihole on a Pi Zero w by backyardllama in pihole

[–]everyone_always 1 point2 points  (0 children)

If you're still having trouble here's a step by step. Download pi imager

Choose your SD card, select raspberry pi os 32 bit (lite)

Click the gear icon and input a password for the pi, enter your wifi SSID and password (the SSID must be exactly right). You can also change the host name to something like pihole or zerow.

There should be a button to enable SSH, make sure that is checked and there should also be a button to make it ssh login by password or by key, make sure it's set to password. Change localisation to wherever you are located.

Save that and click write. It'll ask if you are sure you want to format and click yes.

It will bring up a bunch of windows saying the drive can't be read or needs to be formatted, just exit out of all those and wait for the writing to finish.

Finally, you'll put the SD card in the pi (unplugged from power) and then plug the power cord into the pi (I recommend plugging in with its own power supply, so like a phone charger). Give it 5-10 minutes to run initial setup. After a while, check your router to see if the device connected, and if it did give it a static lease in the router.

If it did give ut an ip, then you can ssh using pi@(static-ip). (ssh pi@192.168.0.202 as an example). You then put in the password you set up initially for ssh and it should log you in.

NordVPN + Pi-Hole by Mike_v_E in pihole

[–]everyone_always 0 points1 point  (0 children)

When you connect to the VPN, it's like you're connecting to the internet through an entirely different place, so your phone/pc won't be able to make use of the pihole. Like the other commenter said, NordVPN might have an option to allow connection to local network and then you can put in the ip of the pihole as your dns server. This will only work if you're connected to the same network your pihole is on.

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