Skip Navigation

A_A

@ A_A @lemmy.world

Posts
14
Comments
333
Joined
2 yr. ago

This Earth, only home i will ever have had, isn't truly mine. No, i'm just a passerby here ... it might yours if you don't feel how weird, how wrong it is.

  • In situ additive ceramic manufacturing

    Jump

  • You are getting to this :

    A + B → C (metastable and insoluble)https://en.m.wikipedia.org/wiki/Classical_nucleation_theoryClassical nucleation theory ...Description ...Homogeneous nucleation ...

    C (metastable) → C(powder precipitate)

    ... unless you have heterogeneous nucleation... first you have to eliminate all particle that can be nucleus on which powder can form, then,... you need to stay away from homogeneous nucleation as described above.... of course you have to provide a substrate on which C will nucleate, and grow,... and this is why, in practice, (for large heterogeneous nucleated solids production) this process is very slow.

  • In situ additive ceramic manufacturing

    Jump

  • (...) there is also energy released in reaction, that can cover for decrease in surface energy (...)

    Put this into equation or tell me how there is any meaning in this sentence.

  • In situ additive ceramic manufacturing

    Jump

  • You start with a powder ( then, maybe a chemical reaction or dissolution, whatever) and after that you don't want to end up with a powder.

    To go from powder to one solid object, the only energy change is the decrease of surface energy. ... you must first see this.

  • In situ additive ceramic manufacturing

    Jump

  • You are trying to put together some words that you think might make sense, but clearly, i am very sorry, but you do not master this domain.Al2O3 : one process that exists to crystallize this at about room temperature is aluminium oxide purification :https://en.m.wikipedia.org/wiki/Bayer_process Bayer process

  • In situ additive ceramic manufacturing

    Jump

  • ... and i told you why it doesn't work. Alternatively, if you look at stalagmites, you are starting with dissolve salts with slow evaporation. Here you get a solid with good mechanical properties. But this process is very slow. Same idea applies to shells and bones.

  • In situ additive ceramic manufacturing

    Jump

  • if you are talking about cement (like in mortar or concrete), we already have a process to turn powder into solid ceramics at room temperature. Otherwise :

    Ca(OH)2 (powder) + CO2 → CaCO3 (powder)

  • "Deleted by creator" sounds like the poster was destroyed by God.

    Jump

  • Same for me, "creator" doesn't sound such a bell about Goddesses (or Gods) either.

  • YSK: Use ‘a’ when the word starts with a consonant sound, and ‘an’ when it starts with a vowel sound

    Jump

  • Let me try : "an Apple", "an nice Apple" ... not sure about the second one ...

  • Why I see different content on the same community with different accounts?

    Jump

  • Looks like you will have to contact the administrators of your instance ... maybe your instance has a community for support from admins ?

  • Why I see different content on the same community with different accounts?

    Jump

  • ... and from those two accounts you do not block specific users or block specific Communities or block specific instances ?

    ... maybe it has to do with language settings for these accounts.

  • is telling an employee how he has to speak micromanaging? Is it toxic?

    Jump

  • [Shitty Life Pro Tip]You answer : okay you want me to explain like you are five ? ... can do that 😏

  • In the US, it's finally socially acceptable again to clap when the plane lands

    Jump

  • 🎼🎶 Clap your hands🎵 !

  • In the US, it's finally socially acceptable again to clap when the plane lands

    Jump

  • ... clap if the plane lands

  • Most people do not know how they died

    Jump

  • ~Anyone, whatever how they died, don't know anything anymore~. Sorry I didn't read, you lived something traumatic, my comment is out of place.

  • Why do people from Western societies always seem to complain?

    Jump

  • This, and the fact that some houses :"... had four windows set in the front of a size and proportion which more or less exactly failed to please the eye."(The Hitchhiker’s Guide to the Galaxy, by Douglas Adams)

  • Deleted

    Permanently Deleted

    Jump

  • Space is defined as 100 km high.

    For the first 10 km or so, with current technology, it's possible to imagine a very light structure in part composed of big impermeable fabric envelope filled with hydrogen that would have a net weight of about zero because of buoyancy in air.The difficult part is the next 90 kilometers high for which i believe we wouldn't be able to build anything that could sustain its own weight.

    On the other hand, if cost and energy was not an issue, with current technology, we could build enormous number of big tanks into which we would pump all the atmosphere, so the height of space would come down to sea level.

    ... of course we would then have also to put oceans and all bodies of water in tanks, otherwise they would boil out into space.

  • Deleted

    This is getting bad. Like, really really bad.

    Jump

  • The people : Waking up exponentiallyPresidency : Rogue and evilCongress : Lethargic and corruptArmy : Serving the ConstitutionSo, act swiftly, wisely, things will change, a lot.

  • Removed

    What are some harmless, innocent gags, jokes or pranks people can pull regarding the ridiculous price of eggs lately?

    Jump

  • in one of the Lucky Luke albums, a town was under siege. Because the price of eggs skyrocketed, one egg was sold and resold until, during a transaction, a chick popped out, causing the price to rise even higher because it was now called a chicken !

  • [solved] Do you know about the upcoming February 5th event ?

    Jump

  • This is a lot of valuable information and since my post is now old (quite dead) no one will have access to this in here.

    So, it's better if you create a new post with these informations.

  • [solved] Do you know about the upcoming February 5th event ?

    Jump

  • Absolutely, that i would say as well from what was discussed here.