#Material hardness testing

[hsmleindia]

Standard Rockwell Hardness Tester

Standard Rockwell Hardness Tester is a widely used instrument for measuring the hardness of materials. It operates based on the Rockwell hardness testing principle, which involves measuring the depth of penetration of an indenter into the material under a specific load. The Rockwell hardness scale provides a numerical value that represents the material’s resistance to indentation. Standard Rockwell hardness testing is commonly employed in industries such as manufacturing, metallurgy, and quality control to assess the hardness and mechanical properties of materials. The test results obtained from the Standard Rockwell Hardness Tester can help in material selection, process control, and product evaluation.

Rockwell hardness test, Rockwell hardness tester, Hardness measurement, Material hardness testing, Indentation hardness test

[suddencolds]

insatiable appetite [1/?]

sooo... this is one of the thirstiest things i have written—and also one of the only times i've written a character with the kink, ever T.T warnings in advance for mess, character getting sneezed on, implied contagion, possible ooc-ness, & me writing this entirely with my d instead of my head

ivan and till are from al//ien sta//ge (a very fun watch which will only take 30 mins out of your life; i really recommend it!!). that said, this fic takes place in a modern au setting, so feel free to read it without any prior context :)

special thanks to @6pmsoup for sending me a very cute alnst doodle of these two which altered my brain chemistry permanently

—

Summary: Till shows up to a dinner outing with a brewing cold. Ivan suffers. (est. relationship, kink!Ivan, ~2k words)

—

For all Till tries to hide it, Ivan can tell immediately.

There’s this: Ivan has been paying attention to Till for most of his life. A full decade before they’d gotten together officially, and some more—this is how long Ivan has had to observe his tells. Always from the sidelines, always with a detached air of indifference that, in reality, was anything but.

All the signs are there the night before. Till, turning up the thermostat a couple degrees higher than he usually keeps it. Spending a little too long in the shower and using up almost all of the hot water. Clearing his throat one too many times in the morning before Ivan leaves for work, his smile distracted, the rasp of his voice nearly indistinguishable—but only nearly.

Now, Till is here for dinner—it’s a dinner they’ve had plans for a couple weeks now, at one of the nicer restaurants downtown, in celebration of Till’s recent promotion. Ivan had booked the reservation a couple weeks in advance.

When Till arrives, stepping out of a taxi cab, he’s wearing a scarf, even though the weather is too warm for it. Ivan steps up to meet him. 

“Sorry I’m late,” Till says. “Traffic here was the worst I’ve ever seen it, swear to god.”

“Was it cold outside today?” Ivan asks, a little pointedly, tilting his head towards his scarf.

Till looks at him, his expression unreadable. Then he nods. “Colder than usual, for this time of year.”

“Strange,” Ivan says, just to be difficult. “But the weather forecast says it’s the same temperature today as yesterday.” 

“It’s probably just windier today,” Till says, readjusting his scarf around his neck. His face is a little flushed.

“Your voice sounds a little off, though.”

Till clears his throat with a scowl. “You must be imagining it,” he says. “It always sounds like this.”

No admission, then. That’s fine. Ivan will get the truth out of him at some point. He lets Till guide him into the restaurant.

It’s a nice restaurant—worth the hassle of the reservation, Ivan thinks. Each table is set with flowers arranged tastefully in long glass vases, empty wine glasses turned on their heads. The server—who leads them to their table in a small, private booth—is wearing a suit.

It’s a shame, really. Ivan has a feeling that he won’t be able to pay attention to any of that tonight.

They sit. Ivan looks down at the menu, picks out something at random in a matter of seconds. Truthfully, he can hardly think of anything less worth his attention right now. He turns his attention to Till instead—Till, who’s seated directly across from him, the scarf still around his neck, obscuring the lower half of his face. 

Till sniffles, reaching down to turn the page, and oh. The sniffle is terribly liquid—has he been sniffling like that all afternoon? Perhaps it’s a good thing that they work at different offices—Till at a law firm, Ivan as a senior manager at a consulting company—because Ivan certainly doesn’t think he’d be able to get any work done with Till sniffling like that. 

It’s not two minutes later that Till is reaching up to wipe his nose against the back of one knuckle. All in all, it’s discreet. Just a quick brush of the fingers against his nose, which is still hidden under the scarf. Though, the look of sheer ticklishness that passes over his features for a brief moment there is...

“What are you thinking of ordering?” Ivan asks.

“I can’t decide,” Till answers. He turns the page again. “It’s between the ribeye steak and the… snf! The pork belly. Is this the kind of place that skimps on the portion sizes?”

“Not from their Yelp reviews,” Ivan says. “You know, if you really can’t decide, I can flip a coin.”

“I’ll pick,” Till says. “Why? Hungry already?”

He looks up, now. His eyes are a little watery. There’s a faint flush over the bridge of his nose. Ivan thinks that if he reached out and touched him, he’d probably be running warm. The thought is almost unbearable.

“Your taxi did take forever to arrive,” Ivan says, by way of explanation. 

“Did you really wait that long?”

He looks uncertain, for a moment. Ivan says, “Not at all. But you know, I’m always impatient when it comes to you.”

Till rolls his eyes, but it’s fond. “There was a meeting that ran late. I wasn’t avoiding you.”

“Is that also a part of your new position?” “I guess so, yeah.”

“I can see why they were eager to promote you, then,” Ivan says. “How productive can late afternoon meetings be, anyways?”

Till snorts. “Not that important. It definitely could have been an email instead. I was about ready to doze off.”

He sniffles again. “Okay. I think I know what I want.” The way he says know betrays the slightest hint of congestion. 

“At long last,” Ivan says, just to be a little bit of an ass. “I’ll call over the waiter.”

He flags their waiter down, waits for Till to order first.

“A spiced apple cider,” Till adds on, at the end, with the slightest of coughs. “Hot, if you can.”

That’s new, too. Till seldom orders hot drinks at restaurants, though he’ll drink tea without complaint if it’s offered. Perhaps his throat hurts, then, from the cold that has clearly started to settle in his system. Subtle, still, but Ivan is familiar with colds like this. He knows it will probably only be a few hours before this deceptively “small” cold turns into…

Ivan orders, too, and thanks the waiter, who leaves with a curt nod. When he looks back over to Till, there’s a… strange something to Till’s expression, a slight distractedness. Irritation.

Ivan swallows hard. He should look away. 

He should, but then, Till’s breath hitches. He pulls the scarf higher over his face preemptively, as if he anticipates having something to have to cover for. The sharp intake of breath that follows is breathy, though Ivan can hear Till’s voice in it. He should really look away.

Instead, he takes the scene in, painstakingly, little by little, as Till’s shoulders jerk forwards. As Till presses a hand to the scarf, presses the fabric closer to his face, to muffle a sneeze into his fingertips:

“hhH-Ih!! hiHH-’IESCHH-eew-!”

God. It sounds utterly miserable, the harsh release of it scraping against his throat, the spray tearing into his scarf. It’s the kind of cold sneeze that is undeniably telling: this is going to be one hell of a cold. It’s not very quiet, either, even muffled into the fabric.

For more reasons than one, Ivan is glad they’re in a private corner of the restaurant, not somewhere more public.

“Bless you,” he offers, once he can trust himself to speak. It’s a good thing that Till is too distracted to look up at him right now. Ivan isn’t sure he can keep what he’s feeling off of his face.

Truthfully, he isn’t sure he’s going to be able to endure a whole night of this.

The problem here is that Till—Till, of all people; Till, who Ivan has been pathetically in love with for almost as long as he can remember—has no idea about Ivan’s… relatively niche interests. That is to say, he has no idea what effect it has on Ivan when he does that.

“Thanks,” Till says, a little stuffily. He sniffles again, lowering his hand. 

Ivan can’t help it. He knows he shouldn’t pursue this line of questioning, but he can feel his self-control dwindling by the second. “Don’t you think it would be better to take off your scarf, now that we’re inside?”

Till freezes. “Y-You know what,” he says evasively. “It’s pretty cold in here.”

Ivan tilts his head in question. “And just how do you plan on eating like that?”

“I’ll take it off when our food comes.”

“I can ask the waiter to turn the temperature up, if it’s a problem,” Ivan says. 

“It’s not a problem.”

Ivan rises from his seat. Till watches him, perplexed, as he heads to the opposite side of the table, where Till is seated.

When he gets there, he stops. Stands, unmoving, so he can study Till from above. 

“What are you—”

Ivan reaches out, settles his palm across Till’s forehead. As expected, it’s warm. Not quite feverish, which is a good sign, but warm enough to be notable. 

“Just how long were you intending to hide this?”

Till stares back at him, wide-eyed. “Hide what?”

Shouldn’t it be obvious? “The fact that you have a cold.”

“I didn’t think it was worth mentioning,” Till says, slowly.

“Hmm.” Ivan drops his hand to his side. He is a little concerned, now. “We could’ve called a rain check.”

This time Till really does roll his eyes. “For the reservation we planned weeks ahead?” he sniffles again. “That just sounds completely and utterly unnecessary. Are you the type of person to call things off just over a little cold?” 

Ivan leans over, tugs down the edge of Till’s scarf. Till bats his hand away just a moment too late, cups his other hand over his face to shield his face from view. For a moment, he looks faintly mortified.

Then his expression settles into something more disgruntled. “What are you doing?” he hisses.

So uncooperative. “Let me see,” Ivan says. Slowly, gently, he pries Till’s hands away from his face, and then—because the restaurant is dimly lit—tilts Till’s face up slightly so that it catches more of the overhead light. 

Till’s nose is redder than usual. He’s probably been rubbing it all afternoon, if the redness that percolates into his cheeks is any indication. There’s  a damp, liquid sheen on the underside of his nose.

“What’s there to see?” Till says, a little crossly.

“Your face, since you’ve been so intent on hiding it under that scarf,” Ivan says, leaning in to get a better look.

Till scowls at him, but there’s no heat to it. “You see my face every day.”

“On the contrary, I don’t see it nearly enough,” Ivan says. “And you hardly ever get sick. Is it so wrong for me to be concerned?”

Without looking, he reaches behind him with one hand to grab a couple cocktail napkins. The other hand he keeps held up to Till’s cheek. 

But then, Till’s breath hitches. “Wait,” he says. Panic flashes through his face. “Ivan, move, I—”

Oh. Well, seeing as there’s no way he’ll be able to get the napkins over in time, it looks like he’ll have to improvise. If Till wants to cover, Ivan can help with that. He moves his hand to cup it loosely over Till’s mouth. Not a second too late, it seems. Till jerks forward unceremoniously, his nose twitching, his eyes squeezing shut.

“hHheh-! HHh’EIITShHh’yYiew!” he gasps sharply. Two? “Hh-! hHiiH’DSSCSSHh-IIew!”  

The jolt of the sneezes is practically electrifying—all of that force, brought to an abrupt halt behind Ivan’s waiting palm. He feels the expulsion of air against his skin, the warmth of Till’s breath, feels the slight dampness behind his hand as the spray mists over his fingertips.

Ivan swallows, hard. Thank god it’s so dark here, otherwise Till might notice what this is doing to him. 

“Bless you,” he says, withdrawing his hand at last to wipe it on one of the cloth napkins. It comes out slightly raspier than he intends it to, though perhaps it’s a miracle that he’s still able to talk at all. “Some cold, hmm?” Belatedly, he hands Till the stack of napkins.

Till practically snatches them from him, turns aside to blow his nose wetly into the top few. The way he sniffles afterwards suggests that his nose is still very much running. 

“Do you have no self preservation? It’s as if you want to catch this,” Till says, drawing back with another sniffle.

Oh, Ivan thinks, fighting back a shiver. That would be far from the worst thing.

[ganondoodle]

(idk if anyone wants to keep hearing my opinions on totk book stuff but-)

apparently it says that rauru DID have kids, multiple even, which yeah... is kinda necessary for zelda to even be connected to them so much so that sonia can SENSE a blood connection (which, even with all the excuses with magic, is just a little too far for me to suspend my disbelief bc its over, OVER, ten thousand years worth of generations that seperate her from them that one lil touch of the hand can sense that (feels more like an attempt to make you care about them or .. see them as zeldas "better" parents just bc they exchange a few nice words, i never got the feeling they were 'better' parents and its also kinda disrespectful to her actual parents, like sure rhoam wasnt the best but i wouldnt call rauru better just bc he was polite)- i could see maybe the light power of hylia or sth but since its the coolest dude that ever lived rauru now that had it which still doesnt make sense and makes me unreasonably annoyed and she can sense BOTH of their powers in her? nah) the fact theres NOTHING about them in the game itself is just so ... no way they planned any of this

i dont think theres anything they can do or say that wont make be believe they either

are making it up alla 'fix it in post' mentality trying to hastily explain stuff the game never bothers to do to try and appease fans or let it appear as if they thought about it at all

something went really REALLY wrong during development, which kinda seems likely given how the game turned out (im sorry i cannot let go, its not just the writing, the game design too and how little was changed in the map while being so damn expensive, i dont know how people dont feel scammed q_q)

given that they (allegedly) spent the last entire year of development on polish (where??? where????? huh??? like it would make it more understandable (EXCEPT for the price) if there was alot of trouble, which was also bc it got delayed and ... turned out like this, but they dont want to say it, especially given their reputation, with that quote i have heard way too many times 'a delayed game blah blah') i just??

are they just gonna go and do it like they did with kashiwa (kass)? "they uuuh where flying around the whole time ony cool sonau tech maschines, you just dont see or hear from them ooooorrr they were uuuuh out of the country at the time" (sending invitations to other continents to join their glorious kingdom ;) )

(bet they are also gonna say they did all the stuff like ... moving the shrines around (lol?) and lifting the islands up into the sky- which is still weird bc ... didnt they also say they were living in the sky before coming to the surface?? so where?? did they park all their islands on the surface and the mystery kids had the keys so they had to repark them back into the sky after they returned off camera?? xD also why are the islands so different as an environment if they where from the surface? like even the STONE up there is different- and if they were first in the sky then on the surface and the nback in the sky .. why is there not a single yellow tree or grass in the past- you cant really argue that it changed bc they were up there so long bc .. nothing else changed, the suddendly and totally always there sonau buildings are largely in prime condition, only some slightly moldy, and what we see of the glorious past looks barely any different from the present, aside from like ... some standard trees shuffled, no castle yet and that glowy uwu filter DESPITE that stupidly long time frame between it)

[icewindandboringhorror]

Everytime I face a new character limit on a website that didn't have them before/used to have really long ones... AUGHHhhh the modern social media world was not made for people like me (lovers of details, rambling, elaboration, thorough explanation, and nuance)

[valiant-portabella-pirkko]

just for fun, I've been snapping fancy shots of each of my beta test characters this time around. so without further ado, these fellas are:

Kara the Fierce (Norn Soulbeast) Valiant Luaith (Sylvari Daredevil) Goria Deathcaller (Charr Reaper)

[materialsscienceandengineering]

Newly created ultra-hard material rivals diamond

Scientists have solved a decades-long puzzle and unveiled a near unbreakable substance that could rival diamond as the hardest material on Earth. The research is published in the journal Advanced Materials. Researchers found that when carbon and nitrogen precursors were subjected to extreme heat and pressure, the resulting materials—known as carbon nitrides—were tougher than cubic boron nitride, the second hardest material after diamond. The breakthrough opens doors for multifunctional materials to be used for industrial purposes including protective coatings for cars and spaceships, high-endurance cutting tools, solar panels and photodetectors, experts say. Materials researchers have attempted to unlock the potential of carbon nitrides since the 1980s, when scientists first noticed their exceptional properties, including high resistance to heat.

Read more.

[mymarifae]

i will always advocate for skipping classes btw. to all the high schoolers following me: don't sweat having a perfect attendance record it quite literally does not matter. if anyone tells you good attendance is important for being considered for scholarships they're lying to you. my attendance was fucking abysmal and i was offered several full-ride scholarships because my grades were still solid and that's all 90% of colleges care about.

and besides. taking care of yourself - whether you need a mental health break or you're tired or you just frankly don't want to go to that fucking class - should always take priority! now don't take a page from my book and skip a month and a half's worth of pe classes because you ditched One Time because the coach said he was going to make everyone run a mile that day and then he kept trying to get you to "make up" the mile that you missed so you kinda just stopped showing up until he gave up on you forever like please know that you should go to class regularly BUT.

i think taking time off and leaving early and such needs to be normalized. for school and work. i don't think it's fair to punish people for needing breaks. the human brain is literally not made to sit in the same stifling environments for 8 hours almost every day and just focus on "working" or "studying" and "learning." it's very cruel to deprive young, still developing minds especially of proper breaks and time to Play (not that it's not cruel to do the same to adults)

if the system won't give them to you freely though... well. break the rules a little. you know your limits better than anyone. don't try to work to an impossible standard. rest when you need to!! it's very, very easy to burn yourself out, but it's very, very, very, very difficult to recover from it

[the-blaze-empress]

:D how's life

holy shit life is so life-y rn. so much of it. so little time. not necessarily bad i am just ridiculously busy atm, going on a trip in literally 12 days holy shit thats so close so i have to do a couple uni assignments two weeks early, which is fun, plus im helping produce a show this year for the uni's ancient theatre club so thats like an extra 5 hours a week of rehearsals and meetings on top of classes and the two early assignments, BUT I GET TO SEE MY PARTNER IN 16 DAYS SO ITS ALL WORTH IT

and ive become slightly obsessed with techno/missa/phil so. yknow thats fun i will be single-handedly canonising and populating the missa/technoblade tag on ao3 i feel

[agustdiv1ne]

all i've learned from this submersible situation is that u could never pay me enough to step foot into the ocean

[navree]

did, uh, Not Great on a midterm for one of the four classes i'm taking (i'm not majorly worried just cuz i've got another midterm and a final as well to improve my overall grade) and i'm trying not to take it too hard because unlike any other time i've gotten a grade i haven't liked this wasn't from lack of trying or not doing something but literally just getting a bad grade

[your-god-empress-lavender]

For some reason i seem to have posted about basically nothing but my materials science ventures in the past few months. Sadly now is not about to break from the trend.

While not much has changed (i haven't even done more experiments because it's literally been below freezing for the last 4-5 days), i have come across more papers on theory and synthesis methods. I also, fortunately, have slightly upgraded my setup.

What's new? Not a ton, but i'm now going to be cooking in a clean borosilicate flask (yay for finally getting some actual lab equipment), i also now have 2 kilos of magnesium sulphate which i may actually get to work with, and finally i have decided to at least experiment with an altered method. This altered method is very similar, but instead of putting the dirty solution on the hot surface, i'm adding sodium bicarbonate to precipitate everything out together (it can then be washed real nice before being heated up). The calcium comes out as CaCO3, the copper as Cu2CO3(OH)2, and aluminium as Al(OH)3. Upon heating, all of these decompose to the respective oxides. This should make everything work better and give a better product. Upsides: more pure, won't damage metal pan, more stable, probably a better mix, a more "lab safe" method, and no chlorine fumes. Downsides: IDK if it'll work at all, may require temps as high as 800C which may be above what i can do, no more liquid metal state (probably), and i don't know how to do it well yet so i need to do many experiments.

Also, i may start getting into zone melting/zone refining. Idk if i really can since it seems like it may require a degree of precision (and maybe some equipment) i don't have in order to get good results. It also may destroy the compound if some other crystal phases are either more favorable or just because the aluminium fraction may not enter the melt properly without heating beyond what i can provide.

[halfdeadwallfly]

the only thing getting me through is the thought that i don't have physics lab next week

[continent-of-wild-endeavor]

I spent more time than I should have at this stage in debating how to do the button band. This needle size or this one? This'll do X, but will it be enough, of should I go smaller/larger? And what kind of buttonholes, comparing techniques, pictures of them, trying to imagine how it'd look irl and guess which one I'd like.

The answer to all these questions? Swatches. It's always more swatches - remember, self! (Also I had to go actually acquire the buttons I wanted to use, to hold them in my hands & pass them through the test buttonholes, rather than trying to calculate based on measurements.)

In the end, I made three button band swatches, each 4-8" x 1.5", picking up along the edges of the one gauge swatch I still had. I tried out different needles, different bindoffs (also on multiple needle sizes), rate of pickup, and 4 different styles of button holes, then two of those buttonhole techniques in more sizes. And then I had all the answers, without testing them out in situ on the 125 stitch picked up button band!

[anoriginalderivative]

just thinking about how testing into a higher reading level exposes you to more intense themes when you’re pretty young. i imagine that might have contributed to my difficulty in relating to my peers in elementary school.

[lilja4ever]

I have to write four essays worth of content in three days,.,,..............

[materialsscienceandengineering]

Study reveals inconsistency in nanoindentation testing using different Berkovich indenters

Nanoindentation testing is a high-precision instrumented indentation test technique that has the advantages of non-destructive testing and simplicity. However, researchers found that when testing the same sample with different Berkovich indenters, inconsistency still arises even if the indenters are regularly calibrated. This inconsistency poses challenges in accurately testing material hardness and comparing data from different laboratories. In a study published in the Journal of Materials Research and Technology, researchers from the Materials Research Center of the Institute of Modern Physics (IMP) of the Chinese Academy of Sciences (CAS) reported that using different Berkovich indenters for nanoindentation testing, excluding fused silica, yields inconsistent results, and they analyzed the reasons behind this inconsistency. The researchers identified two main factors contributing to the inconsistent experimental results, i.e., defects in the indenter tip and the indentation size effect.

Read more.