Is there a way to dissolve or break down polyester fibers?
LordOfTheChia @ LordOfTheChia @lemmy.world Posts 3Comments 307Joined 2 yr. ago
LordOfTheChia @ LordOfTheChia @lemmy.world
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2 yr. ago
Would be nice if the author had done a bit of research on the specific things that had been done in VR since he tried his DK2 to prevent nausea:
An Oculus DK2, a PC that couldn’t quite run a rollercoaster demo at a high-enough framerate, and a slightly-too-hot office full of people watching me as I put on the headset. Before I’d completed the second loop-de-loop, it was clear that VR and I were not going to be good friends.
The study the author quotes dates to August 2019!
For one, non-persistent displays have become the norm. These only show (strobe) the image for a fraction of the frame time and go black in between. Valve discovered that the full 1/90th of a second an image is displayed is enough to induce nausea if the head is moving during that time. So the Vive (and the Oculus Rift) had non-persistent displays.
The stobing effect is so fast you don't notice it.
Elimination of artificial movement is another. The reason Valve focused on games with teleport movement and made a big deal of "room scale" early on was to eliminate the nausea triggers you encounter in other types of experiences.
Valve had an early version of Half Life 2 VR during the days of the DK2, but they removed it as the artificial motion made people sick (myself included).
For many, sims work as long as there is a frame in their field of vision to let their brains lock into that non-moving frame of reference (ex car A-pillars, roof line, dash board, outline of view screen on a ship interior, etc). Note the frame still moves when you move your head, so it's not a static element in your field of view.
Also it helps if your PC can render frames under the critical 11.1ms frame time (for 90Hz displays). Coincidentally, 90Hz is the minimum Valve determined is needed to experience "presence". Many folks don't want to turn down graphic options to get to this. It's doable in most games even if it won't be as detailed as it would on a flat screen. Shadows is a big offender here.
Resolution isn't as big of a factor in frametimes as detailed shadows and other effects. I have run games at well over 4k x 2.5k resolution per eye and been able to keep 11.1ms frame times.
Lastly, it has been noted that any movement or vibration to the inner ear can for many stave off nausea. This includes jogging in place while having the game world move forward. For many years we've had a free solution that integrates into Steam VR:
https://github.com/pottedmeat7/OpenVR-WalkInPlace
Jog in place to make your character move forward in the direction you're facing. Walk normally to experience 1-to-1 roomscale.
I've use the above to play Skyrim VR without any nausea. Good workout too!
For car, flight, spaceflight simulators, a tactile transducer on your chair (looks like a speaker magnet without the cone - or basically a subwoofer without the cone) can transfer the games sound vibrations directly to you and therefore your inner ear and prevent nausea.
I've literally played over 1,000 hours of Elite:Dangerous this way as well as Battlezone VR and Vector 36. All games that involve tons of fast artificial movement.
The main issue is too many people tried out VR cardboard or old DK2 demos with low and laggy framerate, persistent displays, and poorly designed VR experiences and simply write off all VR as bad and nausea inducing.
Edit: added links and trailers to the games mentioned so folks can see the motion involved. The "study" wasn't a proper study. It was a quote from a scientist. No data was given about what headsets or which experiences caused nausea.
First off, the water would need to be desalinated or you would ensure the land would be unsuitable for farming (and really growing anything) for generations.
Also, sand doesn't hold water. In fact, when planting trees and other bushes, if you want more drainage, you typically add rocks and sand.
Second, most plants need non-sandy soil to grow on (palm trees and other beach bushes and plants aside) though those grow in areas that have lots of rain already.
Thirdly, the soil will need bacteria to aid the plants in obtaining nutrients and breaking down waste (dead leaves, dead plantlife, etc).
The way to do it is to look at a couple of projects that are fighting against desertification in Africa:
- The Great Green Wall https://education.nationalgeographic.org/resource/great-green-wall/
- Using compostable waste to fertilize soil https://jstories.media/article/greening-the-desert-with-trash
You'll notice that many of these projects start at the edges of deserts. Instead of relying on pumping water onto sandy soil (which would just suck up the water as sand doesn't hold water that well) they focus on extending the non desert ecosystem onto the desert so that the new soil will absorb water better, the weather over the newly terraformed area will be less dry, and it will eventually be self sustaining.
It was a remake of sorts of It's a Mad, Mad, Mad, Mad World. Many of of the critics that hated it could have been doing so comparing it to the 1963 movie while the audience may have not cared and loved the update with contemporary comedic actors.
To many critics (who watch an insane number of movies) some tropes may seem overused or unoriginal.
Also holy crap, the original was nearly 3 hours long... Guess I'll have to check it out now. That one shows 71% critic and 83% audience scores.
On the topic of Isaac Asimov stories on the big screen, I nominate Bicentennial man. 36% critic and 59% audience score respectively.
I thought it did a good with the themes it brought forth and Asimovs testing of the types of conflicts that would occur with Robots gaining sentience and humanity seeing them as just machines.
Despite the one event near the end that would create a conflict with the laws of Robotics and the effect it should have on a positronic brain.
Also James Horner's awesome soundtrack.
As a layperson reading through this it seems to me the biomarker is related to the metabolic activity of a specific brain region called the subcallosal cyngulate gyrus. They used imaging techniques vs say blood tests, or depression questionnaires to identify the changes from the treatments.
It's confusing because the study linked above is first talking about the deep brain stimulation which was the main focus of the study (and how they effected the anti-depressant changes).
This other link I found is more to the point:
The subcallosal cingulate gyrus (SCG), including Brodmann area 25 and parts of 24 and 32, is the portion of the cingulum that lies ventral to the corpus callosum. It constitutes an important node in a network that includes cortical structures, the limbic system, thalamus, hypothalamus, and brainstem nuclei. Imaging studies have shown abnormal SCG metabolic activity in patients with depression, a pattern that is reversed by various antidepressant therapies.
https://www.biologicalpsychiatryjournal.com/article/S0006-3223(10)01003-6/fulltext
If the imaging is easy to do and interpret, then it would allow for a more objective way to measure the effectiveness of other depression treatments.
As a roadmap of sorts, the corpus callosum is the part of the brain that connects the two hemispheres. Knowing that look at:
https://en.wikipedia.org/wiki/Cingulate_cortex
Edit 2:
This highlits the specific areas (side view) that the paper in the OP is referring to:
Depth wise, the regions you see are basically in the middle of the brain (not left or right) where the two hemispheres touch, towards the front of your head, and right above the corpus callosum (the bundle that connect the two hemispheres).
Basically, put the tip of your index finger above your eyebrows centered above your nose and you're pointing the the right region though it looks like it's buried an inch or two deep.
Eventually they'll express your personalities for you in one of 4 exciting choices!
You should* update her resume, shop around her resume, look at some job postings, and get her to talk to some recruiters.
Update her Linkedin too.
It's one thing to talk about a theoretical possible new job that might be better. It's another to present her with: "These companies will hire you at X% higher and their Glassdoor reviews are better than your company"
I was like that (comfy in my old job) and it wasn't till I was confronted with job postings that were 50% higher pay that I was qualified for and at a better company that I realized I was underpaid and needed to switch jobs.
Edit:
offer to or encourage her to. Maybe it's a bad idea to go behind her back and update her LinkedIn and resume though you could still check out job postings and glass door reviews.
The awesome Internet Historian video on No Man's Sky for those that haven't seen it:
Still looking. Closest I've found so far aside from the Widex app is this web page based generator:
https://mynoise.net/NoiseMachines/acousticPianoSoundscapeGenerator.php
They also have other background noise options:
It's free with optional donations.
They have an android app but it's out of date.
Edit: Theres also Nature space but likewise, their android app is out of date (unsupported on newer devices)
The difference is that if the device comes with Steam OS, then it's ready to go out of the box and you're assured the hardware has good Linux support.
If it's originally a Windows device then you may have to jump through additional hoops to get everything working. Also you'll have to deal with allowing other OS's in the BIOS if it's locked.
Also you've paid Microsoft for a license you won't use.
The flip side is that there's work to make a native Steam OS build for 3rd party portable devices:
and
Hmm no boot drive found, press F1 to play Doom instead!
Kinda like the Sega Master System. If you turned it on without a game and pressed UP + A + B at the screen telling you to put in a game cartridge, it launches a game where you guide a snail through a maze:
Looks like $26.99 is the lowest it's ever been on Steam.
Food scientists want to know OPs location.
To note, 13% of Americans may be deficient in B6:
So if you are one of the 1 in 8 who are deficient and consume an energy drink with B6 then you'll feel more energetic just from the B6.
Then there's the caffeine, taurine, and other B vitamins as well.
That said you can make your own "energy drink" by mixing (safe) levels of B complex, caffeine, and taurine into your favorite beverage.
That or take them separately if you know you're deficient.
Magnesium is also worth trying as if you are deficient you can experience several symptoms including brain fog. It takes effect fast (within 30 minutes). If you take too much Mg then you'll just accelerate the contents of you alimentary canal.
I know on the hearing aides themselves it's called "Zen" which includes white noise options, narrowband white noise, and the fractal tones. I also think there's an option for combining white noise with fractal tones. Don't know if there is a "notched therapy" option (play white noise or other sounds but excluding the frequency of your tinnitus.
The fractal tones can also be tuned by average frequency and the number of tones played per time period per channel. I know mine plays more tones on the ear opposite where my tinnitus is.
I'll post another reply if I can confirm a good fractal tones app. I did a short search in the past but gave up when I came up empty.
Potentially better sources. Somehow in the last couple of days the value of the air defense system went up 700M:
https://uk.news.yahoo.com/ukraine-destroys-russian-air-defence-083306512.html
Know you meme page (for those that want to see the original without giving Twitter or his account the views):
It was already activated, Musk ordered it shut off during an Ukrainian operation meant to take out those ships. The same ships that have been launching missiles and hitting civilian targets.
Elon Musk secretly ordered his engineers to turn off his company’s Starlink satellite communications network near the Crimean coast last year to disrupt a Ukrainian sneak attack on the Russian naval fleet, according to an excerpt adapted from Walter Isaacson’s new biography of the eccentric billionaire titled “Elon Musk.”
As Ukrainian submarine drones strapped with explosives approached the Russian fleet, they “lost connectivity and washed ashore harmlessly,” Isaacson writes.
Source:
Can you share a picture of the piece with the fibers in it?
Lithium grease could help if you can get it under the plastic screw.
If the fibers are long enough, you could try pulling them out with needle nose pliers.
If you are going to try to dissolve out the fibers, try a very small amount on the outside of the plastic screw to make sure it won't dissolve it as well.