Sebastian Kasprzyca

A lifelong learner.

[Sebastian Kasprzyca @SebKasprzyca]

@CapitalVissionX Oops correction 16 😅

[Sebastian Kasprzyca @SebKasprzyca]

@CapitalVissionX 15 obviously xD

[Sebastian Kasprzyca @SebKasprzyca]

@zen_com What is going on with you? I'm a premium subscriber and I got my account locked because 3 days ago you figured out my document had expired. Didn't you know this earlier!? Now I can't use the service because you can't reliably validate my updated documents! 2 days now...

[Sebastian Kasprzyca @SebKasprzyca]

@Azazel_Pazuzu_ @Marek_Kuna_ Pogoda ;)

[Sebastian Kasprzyca @SebKasprzyca]

Windows 11 23H2 is out.
https://t.co/8O8H8SGLev
#Windows11

[Sebastian Kasprzyca @SebKasprzyca]

@clearlinux Hey, any chance to update the expired certificate for the https://t.co/0U6AGdGQak website? 😅

[Nasze lasy, wody, Polska 🌳🌍🏞⚔️ @Nasze_Lasy]

Oto interaktywna mapa planowanych wycinek w Polsce. Przybliż i kliknij obszar, by otrzymać więcej danych. Mapa pokazuje zaplanowane i ostatnio wykonane czynności rębne, ale nie trzebieże, czyszczenia i inne zabiegi o charakterze selektywno-hodowlanym.
https://t.co/gD6piLvqGk

[Sebastian Kasprzyca @SebKasprzyca]

@Andercot Unfortunately no luck this time.

[Andrew Côté @Andercot]

Here is a picture showing the difference between the Meissner effect and flux-pinning, also called 'quantum locking'

[Andrew Côté @Andercot]

First video of LK-99 Full Levitation, aka flux-pinning

This video was just posted to the Chinese video-sharing site BiliBili and claims to be a highly pure synthesized sample of LK-99.

What is the physical phenomenon behind this and what does it mean?

Levitation of superconducting materials is a phenomenon unique to what is called Type-II superconductors, and is an effect whereby magnetic field lines becomes 'trapped' as it passes through the material, providing the force needed to levitate. These are the popular images and videos of cryogenically-cooled discs floating above a magnet frequently seen online and in the pinned post on my profile.

You can think of this like strands of hair being caught in gum - the gum is suspended in mid-air by adhering strongly to the hair as the hair passes through it. The hair in this case is magnetic field lines and the gum is the Type-II superconductor. Just like hair comes in individual strands, or in other words hair is 'quantized' or 'discrete', so is the flux trapped at the 'pinning centers' quantized in what are called 'magnetic vortices' - the quantization of pinned flux lines is a key property and distinguishing characteristic of Type-II superconductors (although technically can occur in Type-I superconductors if the material thickness is smaller than the London penetration depth, which is indeed very small - specifics for the physics nerds out there).

Flux-pinning is entirely unique to superconductors and is also wholly distinct from the Meissner effect. It is not a property of diamagnets or diamagnetism.

At @TRIUMFLab I contributed to flux-pinning studies in Niobium crystal superconducting radio-frequency cavities used for particle acceleration. In that application, trapped flux poses an issue by increasing the remnant surface resistivity of the cavity, which has the effect of decreasing its effective quality factor or Q-factor, which is a measurement of a resonators efficiency. SRF cavities typically have Q-factors of 10E10 and trapped flux at pinning centers reduces the maximum effective accelerating electric field used to drive charged particle bunches close to the speed of light.

Flux pinning is thought to arise in some Type-II superconductors by small imperfections in the crystal, also called volume defects, that enable flux to penetrate the material. In SRF cavities an issue that arises is any magnetic field that is passing through the material, e.g. by the Earth's background field, can become pinned or trapped inside the cavity as it transitions into a superconducting state. See some attached plots in the comments from a study showing how the surface resistivity of SRF cavities increases the more there is a background field as the cavity transitions into superconducting state.

This is the first video I am aware of that claims to show the flux-pinned levitation of a LK-99 sample. If this is in fact what is happening, then it is a very unique and promising finding of this new materials properties and potential for future study.

If this is real then it is truly ground-breaking

[Andrew Côté @Andercot]

First claimed successful replication of LK-99

Accomplished by a team at the Huazhong University of Science and Technology and posted 30 minutes ago.

Why this is evidence:
The LK-99 flake slightly levitates for both orientations of the magnetic field, meaning it is not simply a magnetized piece of iron or similar 'magnetic material'. A simple magnetic flake would be attracted to one polarity of the strong magnet, and repelled by the other. A diamagnet would be repelled under either orientation, since it resists and expels all fields regardless of the polarity.

Caveats
There is no way to verify the orientation of the strong magnet in this video, also, there are yet to be published experimental measured values of this sample. Diamagnetism is a property of superconductors but without measured and verified data, this is just suggestive of a result.

Take-away
If this synthesis was indeed successful, then this material is easy enough to be made by labs other than the original research team. I would watch carefully for results out of Argonne National Lab, who are reported to be working on their own synthesis of a sample.

This overall corroborates two independent simulation studies that investigated the original Korean authors claim about material and crystal structure, and both studies supported the claims.

Lawrence Berkeley National Lab: https://t.co/1Blls3VcgL
Shenyang National Lab: https://t.co/I0NHAP3KsR

The attached video shows a small flake of their sample responding to an external magnetic field. I scroll through the video to skip to the relevant part.

original video credit to: @altryne

[Sebastian Kasprzyca @SebKasprzyca]

@PWr_Wroclaw Z przeprowadzonych testów wynika, że awaria skutecznie zatrzymuje nasze serwery xD

[Sebastian Kasprzyca @SebKasprzyca]

@AndrzejDuda Jak mi do szpiku kości wstyd, że Polska ma takiego prezydenta jak Pan, Panie Duda. Ta prezydentura jest doprawdy surrealistyczna, istne imaginarium schizofrenika. 🤦🏼‍♂️

[Sebastian Kasprzyca @SebKasprzyca]

@SutrykJacek Panie Prezydencie, proszę o podbicie plakatu.

[Sebastian Kasprzyca @SebKasprzyca]

@KM_PSP_GDANSK @RadioGdansk @ZawszePomorze Czy aby wycieczka nie wywróciła łodzi, stając na jednej burcie?

[Sebastian Kasprzyca @SebKasprzyca]

@KM_PSP_GDANSK @PomorskaPolicja @mspirsar @RadioGdansk @Trojmiasto_pl @ZawszePomorze @dz_baltycki @Kierzkowski_PSP Masakra. Współczuję.

[Sebastian Kasprzyca @SebKasprzyca]

I got 12 out of 12 right! Can you do better? Take this quiz and find out how smart you are. https://t.co/e3pqdTVzZ2

[Sebastian Kasprzyca @SebKasprzyca]

@PhilipsCare It seems all your responses went into and disappeared in SPAM and in parallel I cannot find any response text on the support ticket website. I am sad that HBO Max won't be available on my Android TV and on the other one, non Android based as well. I bring back your honour.

[Sebastian Kasprzyca @SebKasprzyca]

@PhilipsCare I have Poland as a country od my residence. We're having few Philips Android TV's and none of them has HBO Max available to install. The one within the warranty period and related with the above case ID is: 32PFS6855/12.
Comments about Philips' poor service got true. :/

[Tech Burrito @TechBurritoUno]

When something is free, you are the product!