!ifrickinglovescience !chemistry a cartoon from 1954 explaining in simple terms the production of vinyl chloride. That's the thing which escaped into the air after the derailment in Ohio a couple of years ago and it's the main compound to produce polyvinyl chloride (PVC), the polymer used to make plastic pipes or for "vinylic piso/floor tile" that !macacos and other LATAM countries use in their office spaces, and the third most produced polymer after polyethylene and polypropylene.

I begin by testing each of the teeth for precious metals content to assess which of the teeth actually contain PMs. Then I dissolve the teeth in hot Aqua Regia for several hours. Once cooled, I filter out any remaining solids from the solution. These solids may contain rhodium or iridium because neither of these metals are soluble in Aqua Regia.

!chemistry THE SAGA CONTINUES

I'm clearly avoiding finishing this video.

I rendered the final video yesterday, had my wife watch it, and she her feedback was "you're just putting yourself down for like five straight minutes" so I gotta redo the narration.

I've recorded 90 minutes of narration today and deleted it all in frustration.

For chads with customizable hotkeys on the keyboard, what are yours doing?

Mine is a Corsair K55 with six macros on the left edge

• G1: Escape, in case I miss the normal Escape button

• G2: Escape, I think I had it doing something different in the past and did this out of laziness.

• G3: Delete, Control+I, Enter. Used to quickly remove a chunk of audio and replace it with a half-second silence.

• G4: Move the cursor to a specific location, right click, move, click. Used to select 'Shape Volume' preset to fade out / back in on a certain section

• G5: Right arrow button. It gets too annoying moving my hand between the arrow keys and G3 when I'm editing out breaths and coughs.

• G6: Types 'MILK', as requested by my cat

!ifrickinglovescience

https://www.nature.com/articles/s41567-024-02633-7

!engineering !ifrickinglovescience what are you guys waiting to try this at your nearby river?

Here is the summary of the YouTube video:

Secession of New West Conifer and Downfall of Alcris

The secession of New West Conifer from the Alcris Groomercord server and NationStates region was triggered by culture clashes and broken promises, culminating in a declaration of independence. Alcris responded by declaring a state of emergency, suspending constitutional rights, and suppressing dissent. Averra, a central figure in Alcris, was exposed for manipulating elections and controlling the government through multiple alt accounts. This revelation of extensive fraud and manipulation led to the collapse of Alcris, which had a unique Swiss-style government structure that was exploited by Averra.

Identification of Alt Accounts and Political Manipulation

An investigation delved into analyzing vast amounts of data to uncover the truth behind Averra's manipulation. By examining posting behaviors, creation times, voting patterns, and NationStates account activity, suspected alt accounts linked to key political figures in Alcris were identified. These accounts displayed low post counts, irregular voting behaviors, shared aesthetic traits, and periods of inactivity. Triren and PotaTown confirmed ownership of certain accounts, revealing suspicious login patterns. Averra's extensive network of alt accounts allowed him to control elections, government institutions, and even influence the Aegis Union.

Averra's Deception and Political Exploits

Averra's manipulation extended beyond Alcris, as he orchestrated political processes in the New West Indies and Alcris, resulting in the annexation of the former by the latter. Through deception and state capture, Averra suppressed political opposition and established a dual state system where legal protections did not apply to certain individuals. He wielded control over the moderation team, engaged in election fraud, and propagated disinformation to maintain power. Averra's influence also extended to non-state actors like the press, shaping public opinion to his advantage.

Unveiling Averra's Network of Deception

The scandal surrounding Averra exposed a web of over 100 alt accounts across various online platforms, used to manipulate diplomatic relations and political decisions. Despite attempts to defend himself, Averra eventually withdrew from the political game and initiated a new government project. Suspicions of Averra's deceptive practices had been raised over the years by individuals, only to be dismissed by his own alt accounts. This scandal highlighted the depth of Averra's deceit and manipulation within online political communities, ultimately leading to the secession of New West Conifer and the merger of Alcris with another Groomercord government.

yt-chat just saved you 56 minutes of your life! 🕰️

Crazy how someone would go through all of this effort to ERP different characters just to control some shit that no one cares about. Thank god nothing like that could happen here.

Hey you, the person reading this, you can ping engineers or ifls on this thread (if you feel like it)

Previous thread:

https://rdrama.net/h/nerdshit/post/301878/inquiry-into-the-titan-disaster-reveals

Scott Manley video:

Documents:

https://www.news.uscg.mil/News-by-Region/Headquarters/Titan-Submersible/

CliffsNotes:

• Oceangate experimented with a full-carbon hull for their submersible, but the hemisphere endcaps would cave in on the models hence the switch to titanium for the final design

• The carbon fiber was selected as a cost-cutting material in an effort to make the submersible as light as possible. That in turn was done to save cost on the support ship required to deploy the submersible, as this was intended to become a commercial operation at some point, with submersible expeditions being sold as tours for the general public

• Carbon fiber is not on the list of approved materials for the fabrication of human-rated pressure hulls. This is not due to any of its intrinsic properties, but rather due to lack of testing of such vessels.

• It is a well known fact that carbon fiber is capable of supporting tensile stress but does not manage compressive stress as well, hence its unsuitability as a material for submersibles. This fact was parroted here a lot by resident subject matter experts . However, the testifying engineer believes this to not be an issue as the same was said about acrylic plastics, which were initially met with strong skepticism but are now one of the officially approved materials for construction of human-rated pressure vessels. He believes that none of the carbon fiber's downsides are complete deal-breakers and a solution could have been developed that would allow for its eventual implementation. He backs his point by presenting various different composite submersibles, including the chinese Petrel-X that is rated for 10000m depth. He believes that composite materials provide several advantages over traditional ones (like corrosion resistance) and that with enough development and testing carbon fiber could be deployed as a material for pressure vessels, with the issue being that Oceangate did not invest nearly enough in research of this material to justify using it.

• Speaking of acrylic, the acrylic window used on the Oceangate vessel was rated only up to a 1000m dive depth, as compared to the nearly 4000m at which Titanic sits. It is a miracle that it hadn't failed, which we know it likely didn't due to analysis of wreckage (see last post)

• The reason the window wasn't rated to the correct depth is due to the fact that instead of going for a concave inner surface, like the industry standard, Oceangate instead opted for a filled hemisphere-like shape, with a flat inner surface, with the reasoning being that a concave window would cause lensing and make close-up objects appear further away, which they wanted to avoid for the sake of satisfying the potential customers.

• Some information regarding the manufacture process was revealed:

• Oceangate had previously constructed 2 prototype vessels, both of which failed, by layering the carbon-fiber sheets only radially. The final design included perpendicular carbon-fiber sheets, which were aligned both radially and longitudinally. It is also revealed that their consultant, Boeing (lmao ) suggested a carbon-fiber sheet to be layered at 45 degrees to radial, but this wasn't done in the final vessel likely due to the difficulty of manufacturing it.

• It is also noted that during the construction of the hull, they would notice occasional wrinkling of the carbon fiber in certain spots, which would only accumulate with each subsequent passing and result in a non-smooth cylindrical shape by the end. To combat this, they decided to split the entire 5-inch thick hull into 5 1-inch thick concentric cylinders, each of which would be ground and smoothed at the end to remove said wrinkles and provide a smooth surface for the next layer. The layers would be then held together by some sort of surface-roughener and industrial adhesive. One might imagine that grinding at carbon fiber would compromise its strength, and it is interesting that after taking cross-sections of the 5 different layers and counting the amount of wrinkling sites, they didn't observe any reduction of them and in fact each consecutive layer had more wrinkles than the last, the only difference being that they were invisible from the outside now.

• Analysis of the wreckage shows that the hull did fail along the inter-layer seems, though not all layers disjoined in this way, which could either be random chance or an indication that some of the layers were glued together better than others. Similarly there are no signs of carbon-fiber films themselves tearing within each individual layer, which demonstrates that the resin cure which was used between the carbon-fiber sheets held way better than the adhesive which they used to join the bigger layers together

• Similarly by analyzing the recovered hull fragments the researchers noted that the imperfect cylindrical shape of the carbon-fiber layers translated into uneven coatings of interlayer adhesive, where some regions would have a lot of adhesive and others would have practically none. In addition to that they also noticed microscopic longitudinal rub marks in between layers and deposits of crushed, powdered glue that would accumulate in some of the voids between the layers. This indicates motion between the different layers which is very very bad as you want the vessel to act as a single solid structure in order to withstand the outside pressure, instead of having these individual sliding layers.

• Cross-section analysis of the individual layers also revealed small voids and cavities between the carbon-fiber sheets. Whether this is in any way significant to structural integrity of the bulk material is unknown either to me or the video author.

• The frontal metal end-ring which connected the titanium hemisphere to the carbon-fiber hull and was suspected to be the source of initial failure was recovered and analyzed. The suspicions were largely confirmed as inspection of the gluing site which held the ring to the carbon-fiber showed that the glue was peeled right off the metal ring and mostly remained on the carbon-fiber part. (gluing the parts is apparently a industry-standard practice, for more info see last thread). This indicates that the glue-metal interface was likely the source of initial failure. Moreover the video author proposes to narrow it down to the bottom section of the glue-metal interface on the metal end-ring, as that is the segment where the carbon fiber hull was absolutely shredded and no larger pieces remain, as opposed to the upper side where large pieces had stratified into the individual layers discussed above. In his opinion it is the shear motion of the layers around that point which could have destabilized the hull and caused it to be shredded.

The Real-Time Alert System Truth Nuke:

The alert system on the vessel consisted of acoustic sensors mounted around the hull, which would listen for the sounds of shit breaking and record the data for later analysis, and tension sensors, also mounted around the hull, which would measure the tension or compression that the hull underwent and similarly record the data for later. It also seems that not all of the sonic sensors were functioning, but somehow this isn't even the crazy part.

Now, on dive 80, at around 15:30 (shown on graph), during resurfacing the sensors recorder a loud-butt crash. It was so loud that the passengers heard it, it was so loud that potentially the surface crew might have heard it. It was dismissed by Stockton as the carbon hull setting into the metal ring, something unrelated to the structural integrity. But looking at the tension sensor readings at the same time shows a big jump, indicating that the hull had been rapidly deformed.

Looking at the tension sensor readings for subsequent dive 81 (red) and comparing it to previous dive 80 (blue) shows that the vessel behaves differently at the beginning of the dive, indicating that after this bang the hull now has a different deformation mode. And this mode of deformation is localized to the forward-bottom-left area of the carbon fiber, that sits right against the metal end-ring discussed earlier. This behaviour persisted for the following dives as well.

So basically the warning system worked as intended, giving them all the information needed to see that something is going wrong with the vessel, but Stockton chose to ignore it.

The dive 80 happened back in 2022, and since then the submarine was transported, left outside in the weather, fallen off the tow-boat, and dove several more times, all likely worsening its condition, and one engineer even expressed concerns with the matter in which it was lifted by crane, arguing that it wasn't designed for the kind of tension it experiences when being hooked from above and left to dangle.

The TL;DR is that it was literally all willful negligence and they could've stopped and re-evaluated this thing at literally any point right up to the day it sank, but chose not to. What a horrid way to go

!ifrickinglovescience

!trekkies he finally made it to the intergalactic indian reservation

@MasterLawlz

Absolute kino @ILoveChapose @Aevann

!ifrickinglovescience !mathematics !sophistry SO TRUE ISN'T IT! 58 PEOPLE WATCHING THE VID WON'T BE ALIVE NEXT WEEK

https://old.reddit.com/r/kurzgesagt/comments/1foem68/new_video_this_video_will_save_your_life_next_week/

Redditors are calling the video clickbait lmao. Looks like the bird science show ran out of ideas.

I heard Amazon glacier is the cheapest but people have had trouble accessing their backups. Any other recommendations?

I have like 4TB or data, mostly my self backed up betamax collection from way back when.

!codecels

The US Coast Guard has just begun its public inquiry into the Titan Submersible accident, and in the process has released a number of documents, including, critical footage from a remotely operated vehicle showing the wreckages on the ocean floor. The spaceman looks at the available material and gives his own thoughts on why the sub failed.

Key takeaways from the video:

• ROV footage was released showing the wreck. Apparently it's only the pressurized section that caved in as the footage shows the unpressurized tail-end containing electronics to be mostly in one piece

• Full communications transcript has been released. It does not indicate that either crew was in any way aware of the vessel failing

• Despite what many people (including on here) said, carbon fiber and titanium have apparently been successfully used for submersible design by US navy, the significant difference being that it was for an ROV

• The footage shows the pressure hull having imploded unequally, instead a lot of material was being pushed into the tail-end. Judging off this, it is likely that the structure failed at head-end, potentially on the interface of the titanium end-ring and the carbon fiber, which lead to buckling further down the line and collapsed the whole structure

• Previously the most circulated idea was that point of failure occurred in the center of the vessel, where it is exposed to peak stress

• There is also footage from OceanGate promotional videos showing the installation of said end-ring, where they glue it in place (which coincidentally is what the US navy did for their ROV as well)

• The failure at that section might have been caused by mismatched moduli of compression of the two materials, causing extra stress between carbon fiber and titanium as they were compressed under pressure. That is however a wild guess by the author of the video with nothing to back it up, and he himself admits that it could've been a variety of other factors involved in cutting costs, like using low-quality carbon fiber

• The prototype for the atmosphere scrubber on board was a sealed plastic box with the absorbent... and a single PC fan blowing over it

@ACA discuss