
node:	Science fetish
template:	3
parent:	Veda a technologie
owner:	cv::be
created:	05.03.2010 - 17:52:24
updated:	03.03.2012 - 21:25:00

cwbe coordinatez:
101
63533
5211994

ABSOLUT
KYBERIA

permissions
you:	r,
system:	public
net:	yes

neurons
stats|by_visit|by_K source tiamat K|my_K|given_K last commanders polls
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Science fetish

...'cause it works, bitches.

Pre tych co su zasiahnuti vedou. Cielom fora je zdielat a pastovat linky/texty na zaujimave vedecke clanky, ale pre vacsinu ludi postacia zrozumitelne spravy o nich. Obsah je disciplinarne neobmedzeny, preto uvitam co najvacsiu pestrost. Proste pripustny je akykolvek vedecky a vedecko-popularny material, nech je to e-book, video ci plain text. Takisto je vitana diskusia ci polemika..alebo len tak onanovat nad tym, ze vediet je uzasne.

...a preco? Nech je tento svet akokolvek zly, spoznat ho, je ta najkrajsia vec, co s nim mozeme urobit.

niekolko vedeckych/akademickych portalov:
http://researchblogging.org/post-list/list/date/all
http://news.sciencemag.org/
http://www.nature.com/news/index.html
http://www.osel.cz/
http://vesmir.cz/
http://www.sciencedaily.com/
http://news.nationalgeographic.com/news/
http://www.national-geographic.cz/
http://scienceblogs.com/
http://www.scienceweek.cz/
http://harvardscience.harvard.edu/
http://www.newscientist.com/
http://www.universetoday.com/
http://www.physorg.com/
http://www.jove.com/index/Main.stp?
http://veda.sme.sk/
http://academicearth.org/
http://chaosradio.ccc.de/
Audiovizualni centrum studentu CVUT
Popular science - 1872-2009 @books.google
http://cvtisr.sk/
http://www.wolframalpha.com/
http://www.sav.sk/
http://slashdot.org/
http://www.documentarytube.com/
http://www.documentarywire.com/

youtube channels:

http://www.youtube.com/user/Thunderf00t
http://www.youtube.com/user/cdk007
http://www.youtube.com/user/AronRa
http://www.youtube.com/user/StanfordUniversity#p/u
http://www.youtube.com/user/UCBerkeley#p/u
http://www.youtube.com/user/Best0fScience
http://www.youtube.com/user/ScienceMagazine

spriatelene fora:

STATISTIKA & co.
B O INC
Sprosto-vedecke otazky
Folding@home
teoria chaosu
Amateur Sky Survey
Popularne vedecka knihovnicka
CERN
Kult informácií a dát
Online prednasky
Zaujimavosti

“Knowledge itself is power”
Francis Bacon

00000101000635330521199409040465

"They can recover 95% of the input energy. They can do that because their FRC naturally expands again after the compression and that induces a current into the coils." - teda po fuziu sa im vrati energia naspat do kapacitorov, velmi velmi cool approach

0000010100063533052119940904046509041639

zaujimalo by ma, co sa stane, ked nieco zlyha a ta plazma sa dotkne steny
spominali, ze 100 mil. C
vyzeraju tam vsetci taki spokojni a kludni

000001010006353305211994090404650904163909041650

Tak treba si uvedomit, ze ta energeticka hustot je nizka, to su velmi male mnozstva tej plazmy pri takej teplote. Keby to magneticke pole uplne zlyhalo, tak by sa to v prvom rade ochladilo dekompresiou a max. by to trosku zacalo korodovat steny toho reaktora. Ked to vsak chces zopakovat milion krat za sekundu a vzdy ti par percent plazmy skonci na stene tak zivotnost bude nizka, preto to musi byt spolahlive. Ale nebezpecenstvo tam nie je nijake. Teda samozrejme pracuju prakticky s vodikom, ktory moze vybuchnut ale to nie je otazka plazmy.

00000101000635330521199409040465090416390904165009041734

Rozumiem, uz som kludnejsi :) Predpokladal som, ze ked sa to suchne o stenu, tak polka miestnosti sublimuje za milisekundu. Zrejme v tomto stadiu su to len drobne pokusne mnozstva a ked to bude funkcne a vychytane, zacnu to skalovat. Lebo ak to ma byt relevantny zdroj energie, asi to bude treba robit vo vyrazne vacsom meritku.

0000010100063533052119940904046509041639090416500904173409041743

ono su to vzdy male mnozstva aj pri komercnej produkcii. v tom videu hovorili, ze ten velky tokamag planuje spalit 300 g tricia denne a videl si ze to je velke ako hala.

00000101000635330521199409038173

https://www.cell.com/matter/fulltext/S2590-2385(22)00693-2

This study presents a class of magnetoactive phase transitional matter (MPTM). MPTMs exhibit a combination of high mechanical strength, high load capacity, fast locomotion, excellent controllability, and robust morphological adaptability. This unique combination of properties is enabled by the reversible transition of MPTMs between rigid and fluidic states through alternating magnetic field heating and ambient cooling.

tu je videjko ako sa taky MPTM "robot" roztecie aby utiekol z klietky: https://www.eurekalert.org/multimedia/971927
(ale od T-1000 z Terminatora 2 to ma este daleko kedze z tekuteho do pevneho skupenstva ho musia "manually recast")

00000101000635330521199409034515

0000010100063533052119940903451509034848

Len otazka: stale sme v stave ze vytvarame male slnko len aby sme si zohriali vodu, ci uz vymyslel niekto nieco lepsie?

000001010006353305211994090345150903484809034874

Áno, v podstate všetci chcú zohrievať vodu a roztáčať turbíny.

Je tu jeden startup Helion Energy čo extrahuje elektrickú energiu priamo "with fucking magnets", ale zišlo by sa mu ťažiť Hélium na mesiaci, plus zatiaľ má len prototyp s impulzom tuším 1x za 10 minút a potrebuje sa dostať na 10x za sekundu.

0000010100063533052119940903451509034754

Ta myslienka na konci pekne vystihuje co od fusion power cakat:
If we do make a choice now to impact climate change, there'll be a sacrifice. Fusion gives a hope that that sacrifice doesn't need to be forever.

0000010100063533052119940903451509034737

TLDW: ku koncu hovoria ze nie v tejto dekade, ani tej dalsej, mozno na konci nasho zivota.

00000101000635330521199409021359

Wolves emboldened by parasite more likely to lead pack: study
https://www.france24.com/en/live-news/20221125-wolves-emboldened-by-parasite-more-likely-to-lead-pack-study

The single-celled parasite, Toxoplasma gondii, only sexually reproduces in cats but can infect all warm-blooded animals.

Between 30-50 percent of people worldwide are estimated to be infected with the parasite, which remains for life as dormant tissue cysts. However people with a healthy immune system rarely have any symptoms.

...

They found that infected wolves were more likely to foray deeper into cougar territory than uninfected wolves.

Infected wolves were also 11 times more likely to leave their pack than wolves without the parasite, the study said, indicating a higher rate of risk-taking.

And an infected wolf is up to 46 times more likely to become pack leader, the researchers estimated, adding that the role is normally won by more aggressive animals.

...

00000101000635330521199408991997

fascinujuce citanie o jednom z asi najvacsich vedeckych podvodov za poslednych 20 rokov.

BLOTS ON A FIELD?
A neuroscience image sleuth finds signs of fabrication in scores of Alzheimer’s articles, threatening a reigning theory of the disease
https://www.science.org/content/article/potential-fabrication-research-images-threatens-key-theory-alzheimers-disease#graphic

skratena (aj tak velmi detailna) verzia v cestine
https://www.seznamzpravy.cz/clanek/tech-technologie-veda-vedecky-podvod-stoleti-manipulace-ve-slavne-studii-unikaly-pozornosti-15-let-209908

0000010100063533052119940899199708992717

toto som čítal minule, zauímavé

0000010100063533052119940899199708992604

na margo podvodov vo vede odporucam tuto standup/prednasku https://youtu.be/bkRVdGDaM3I

000001010006353305211994089919970899260409004667

Slavicek je super, vsetky "prednasky" od neho stoja za to

000001010006353305211994089919970899260408992612

jj https://kyberia.sk/id/8607971 :)

00000101000635330521199408991997089926040899261208992619

approved, dobry vyber!

00000101000635330521199408971409

https://twitter.com/wonderofscience/status/1520753280229421056

00000101000635330521199408967079

3 roky pred cigarou...
https://www.livescience.com/first-interstellar-object-detected
https://twitter.com/US_SpaceCom/status/1511856370756177921

00000101000635330521199408966677

https://futurism.com/the-byte/new-finding-alters-how-universe-works

The study, published in the journal Science, sports a walloping 400 researchers and collaborators and took more than a decade to complete, according to the Guardian. The findings rest on the most accurate measurement ever recorded of a particle called a W boson, which is an electrically charged fundamental particle that governs one of the most fundamental rules of the physical world: weak force.

povodny zdroj:
https://www.theguardian.com/science/2022/apr/08/extraordinary-w-boson-particle-finding-contradicts-understanding-of-how-universe-works

00000101000635330521199408960670

00000101000635330521199408949649

Čím je v regióne rýchlejší prístup na internet, tým menej sa ľudia zapájajú do spoločenských aktivít vo svojom okolí, zistil výskum v Británii. V oblastiach blízko telekomunikačných uzlov, kde je internet veľmi rýchly, napríklad o 10 % menej ľudí robí dobrovoľnícke práce v sociálnej oblasti. Za každé dva kilometre, o ktoré narastá vzdialenosť bydliska človeka od telekomunikačnej ústredne, sa o 19 % znižuje šanca, že sa človek zapojí do činnosti nejakej politickej strany. Na počet interakcií s členmi rodiny a priateľmi však rýchlosť internetu v domácnosti nemá vplyv.

src: dennikn tldr => https://www.theguardian.com/politics/2022/jan/23/internet-access-decline-civic-engagement-uk

00000101000635330521199408947921

Trikrát za hodinu sa ukáže tak, že je najjasnejším rádiovým zdrojom na oblohe. Vedci pozorovali objekt, ktorý predtým nikto nikdy nezahliadol.

Neznáme teleso sa na oblohe zjavuje a mizne ako veľmi pomalý maják.

Rádiový signál prichádza zo vzdialenosti štyritisíc svetelných rokov. Pozoruhodný je tým, v akom zvláštnom intervale pulzuje.

"Zistili sme, že pulzuje každých 18,18 minúty," píšu v štúdii autori pod vedením astrofyzičky Natashe Hurley-Walkerovej.

Vedci si myslia, že môže ísť o typ magnetaru, ktorý rotuje veľmi pomaly. Magnetar je neutrónová hviezda, ktorá má extrémne silné magnetické pole.

O pomaly rotujúcich magnetaroch doteraz vedci iba teoretizovali. Nečakali tiež, že ich niekto zachytí priamo pri pozorovaní. Astrofyzici totiž odhadovali, že podobné hviezdy budú veľmi málo jasné.

"Zdá sa, že magnetickú energiu premieňa na rádiové vlny omnoho efektívnejšie ako čokoľvek, čo sme doteraz videli," hovorí astrofyzička Hurley-Walkerová.
https://tech.sme.sk/c/22827962/neznamy-vesmirny-objekt-zaskocil-vedcov-sprava-sa-ako-ziadny-iny.html

00000101000635330521199408947467

kto nechce vysvetlenie, preklik na 3:00
velmi ma upokojuje to rozbijanie

00000101000635330521199408945348

Len pred par dnami som tu daval povzbudzujucu novinku, kde sa potvrdilo, ze EBV sposobuje MS. Necakal som, ze to pride tak skoro, ale oni uz sa hraju aj na to, ze vedia ako:
The researchers arrived at this conclusion after analyzing the antibodies present in the blood and spinal fluid of nine MS patients, and determining that the condition appears to be associated with a certain pattern of antibody proteins that are produced by immune cells in the spinal fluid. When they tested these antibodies for reactivity with EBV they found that they had a high affinity for a protein called EBNA1, which makes up part of the virus. Eight of the nine patients studied had antibodies that bound to some fragment of EBNA1.

Further analysis revealed that the same antibody is also able to bind to a separate protein known as GlialCAM, which is found in the myelin sheaths that insulate nerve cells and enable the efficient transmission of electrical impulses. Multiple sclerosis is associated with a loss of myelin, resulting in symptoms including muscle weakness, numbness, and fatigue, and the destruction of GlialCAM by these EBV antibodies therefore represents a clear link between the virus and MS.

“Part of the EBV protein mimics your own host protein – in this case, GlialCAM, found in the insulating sheath on nerves,” said study author William Robinson. “This means that when the immune system attacks EBV to clear the virus, it also ends up targeting GlialCAM in the myelin.”

To confirm this finding, the researchers injected part of the EBNA1 protein into mice that had been bred to suffer from a rodent model of MS. They found that this resulted in an increase in immune cell activity within their central nervous systems, greater demyelination, and more severe paralysis.
https://www.iflscience.com/health-and-medicine/epsteinbarr-virus-triggers-multiple-sclerosis-and-now-we-know-how/

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Teším sa z toho veľmi, len keby mi niekto ešte vyriešil, ako sa EBV zbaviť. :)

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https://kyberia.sk/id/8940829

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<3

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Tie myši sú tiež hrdinovia

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"v prvej linii"

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skor obete, no :( testy na zvieratach tymto objavom pridavaju trpku pachut.