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#graphene

0 message0 participant0 message aujourd’hui
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Unbloated :blobcatcoffee:

I'm intrigued to know this.
Does people lurking here actually use Linux itself on their phones, or simply Android as usual?

· 8 personnes · Fermé
#android#linux#poll
A répondu dans un fil de discussion
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Doc Edward Morbius ⭕​

@johncarlosbaez Ooooh!

So ... I've had a theory of ... stuff ... for a while, one aspect of which goes a bit like this:

Phenomena for recording or transmission of information have a modifiable regularity which can usefully generated, preserved or transmitted (for recording or signalling systems respectively), and detected.

Think of Schroedinger's "aperiodic crystals", a notion I'd first encountered ... maybe four decades ago. (Not sure if it was Hofstadter's Goedel, Escher, Bach or perhaps Jeremy Campbell's Grammatical Man, but mid/late 1980s, regardless.)

This means that there are certain phenomena which immediately suggest themselves as recording media or transmission channels. The regularity of a smooth stone, clay, or papyrus, parchment, or paper surface, for example, which can be etched or inked. Vinyl and polycarbonate can be etched with analogue waveforms or digital bit-patterns. The regularity of a magnetic medium whose polarity can be reversed. The regularity of a waveform, be it audio, radio, or optical. And the transmission channels of speaking tubes, RF waveguides, or fibre-optic strands.

EMF, masers, and lasers in this view are fairly readily apparent as possible transmission media, I realised after the fact.

And the extreme regularity of graphene suggests that it might be usable as an extremely thin, small-structured recording medium. The challenges I'd seen for this were how it might be transformed, whether or not those transformations were regular over time, and whether or not the transformations were nondestructively detectable. That is, can it be written, preserved, and read over time.

And this suggests to me that it might be one such method for doing so.

(I'm not the first person to think of graphene as a data storage medium. Though I'm not aware that there's been any successful practical demonstration as yet.)

Incidentally, transistor memory is sort of a curious exception to my recording-medium notion in that it consists of states which are (destructively) read, and which aren't particularly reliable, though they can be sustained through a destructive read/rewrite process.

And if not graphene, then perhaps something similar to it in which a regular lattice can be disrupted.

Related notion: the symmetry between records and signals as existing in space-time and energy-matter respectively:

  • Signals act to transmit an encoded symbolic message from a transmitter across space through a channel by variations in energy over time to a receiver possibly resulting in a record.

  • Records act to write an encoded symbolic message from a writer across time through a substrate by variations in matter over space to a reader possibly resulting a signal.

toot.cat/@dredmorbius/10638852.)

Toot.CatDoc Edward Morbius ⭕​ (@dredmorbius@toot.cat)This musing follows on a set of earlier thoughts on the symmetry between *signals* and *records*. **Signals** act to *transmit* an *encoded symbolic message* from a *transmitter* across *space* through a *channel* by variations in *energy* over *time* to a *receiver* resulting in a *record*. **Records** act to *write* an *encoded symbolic message* from a *writer* across *time* through a *substrate* by variations in *matter* over *space* to a *reader* resulting a *signal*. Again, there are hybrid forms as well, e.g., endocrine and chemical signalling systems are based on *records* (the encoded chemicals) but distribute much as *signals*. **Edits:** Lightly updated definitions: "reader" rather than "receiver" as end-chain for records, and resulting in their complements, as well as formatting. 2023-5-11. Deleted spurious "from a" left from previous edit. 2025-5-6.
#graphene#recording#RecordingMedia
Public
michael

23-Apr-2025
Revolutionary microscope reveals #quantum dance of atoms in twisted #graphene

eurekalert.org/news-releases/1 #science #nanoworld

EurekAlert!Revolutionary microscope reveals quantum dance of atoms in twisted grapheneWeizmann Institute scientists introduce a powerful tool to explore quantum phenomena — the cryogenic Quantum Twisting Microscope (QTM). Using this pioneering instrument, researchers have observed — for the first time — the interactions between electrons and an exotic atomic vibration in twisted sheets of graphene, called a "phason." These findings shed new light on the mysterious superconductivity and “strange metallicity” that emerge when graphene sheets are rotated to the “magic angle.”
Suite du fil
Public
Spaceflight 🚀

#Graphene-based nanocomposites can serve as potential #radiation ☢️ shields against ionizing radiation in the gamma and X-ray ranges, boasting a mass attenuation coefficient exceeding 0.2 cm2/g nature.com/articles/s41598-024

NatureGraphene-based nanocomposites as gamma- and X-ray radiation shield - Scientific ReportsCommonly used materials for protection against ionizing radiation (gamma and X-ray energy range) primarily rely on high-density materials, like lead, steel, or tungsten. However, these materials are heavy and often impractical for various applications, especially where weight is a key parameter, like in avionics or space technology. Here, we study the shielding properties of an alternative light material—a graphene-based composite with a relatively low density ~ 1 g/cm3. We demonstrate that the linear attenuation coefficient is energy of radiation dependent, and it is validated by the XCOM model, showing relatively good agreement. We also show that the mass attenuation coefficient for selected radiation energies is at least comparable with other known materials, exceeding the value of 0.2 cm2/g for higher energies. This study proves the usefulness of a commonly used model for predicting the attenuation of gamma and X-ray radiation for new materials. It shows a new potential candidate for shielding application.
#RadiationProtection#HumanSpaceflightHealth
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Lars Marowsky-Brée 😷

We need a free/libre fork of #Android for the public commons. Google cannot be trusted.

Maybe that could be #lineageos or #Graphene, but given that they build on top of Android rather than driving the core development, I'm not certain they would be enough as it stands.

9to5google.com/2025/03/26/goog

9to5Google · Google will develop Android OS entirely behind closed doors starting next weekPar Ben Schoon
#DigitalSovereignty#eupol#OpenSource
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the magnificent rhys

Oh excellent — the latest #Graphene update enables the #Linux Development Environment that just got included in the latest Android 15 builds for Pixel devices and will be launching more widely with #Android 16.

It's a full virtualised Debian environment running on your phone. I haven't played with it yet but apparently it can run desktop apps.

edit: it doesn't work yet :(

Public
*|FNAME|* 🇨🇦🇺🇦🇬🇱

#AskMastodon

My trusty old iPad Mini 4 is starting to show its age (it won’t run any of the modern clients for Masto) and I’m thinking about a replacement, however I’m deeply distrustful of Cupertino at the moment, given their recent actions.

Basically, my use-case for a tablet is:

  • reading ebooks
  • doomscrolling the Fedi
  • listening to podcasts
  • streaming from Plex

I’m only interested in an 8-inch that I can hold like a book.

Hardware-wise the #AmazonFire looks like a bargain, but of course Bezos can lick my taint. Given that the Fire is basically an Android, has anyone had success at replacing the OS with a de-Googled OS like e/os or Graphene?

#DeGoogle#Graphene#Eos
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maschmi

I'm planning to get rid of #Google and Meta a fatr as possible. While Meta is kind of straightforward, Google gives me more to consider and may result in me buying a new phone. I would like to stick with #android and limited it down to some choices, but need help in deciding and fresh ideas. What would you do?

If you like to boost, feel free to do it ;)

Edit: I may need my old phone with Google service for some things. Not yet clear/decided.

· 47 personnes · Fermé
#fairphone#calyx#graphene
A répondu dans un fil de discussion
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stefania maurizi

Steven Murdoch, professor of security engineering at #UCL, believes that, based on publicly available info as of last July, the police have no chance of extracting the information from the #Graphene operating system phone, using #Cellebrite

[English, free from paywall]

ilfattoquotidiano.it/in-edicol

Il Fatto Quotidiano · British journalist could face years in prison for refusing to hand over his passwords to the policePar Stefania Maurizi
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Kevin C. Tofel

Serious question for folks running a #homelab server, who (like me) try to take back control of our data and digital activities from “big tech”:

What phone do you use that fits into that strategy?

I currently use an iPhone 15 Pro and could go back to an Android device (running #CalyxOS or #Graphene, which I’ve done before) but it seems like that’s the only option. Which sucks IMO. #Linux phones just aren’t there yet. 👎🏻

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