{"id":681,"date":"2023-10-10T11:21:48","date_gmt":"2023-10-10T10:21:48","guid":{"rendered":"https:\/\/www.ujfi.fei.stuba.sk\/wordpress\/?p=681"},"modified":"2024-02-07T13:05:02","modified_gmt":"2024-02-07T12:05:02","slug":"aktualny-vyskum-22","status":"publish","type":"post","link":"https:\/\/www.ujfi.fei.stuba.sk\/en\/aktualny-vyskum-22\/","title":{"rendered":"Pozitr\u00f3nov\u00e1 annihila\u010dn\u00e1 spektroskopia ako n\u00e1stroj na sledovanie zmien vlastnost\u00ed mater\u00e1lov vplyvom extern\u00fdch faktorov"},"content":{"rendered":"\n

Pozitr\u00f3nov\u00e1 anihila\u010dn\u00e1 spektroskopia (PAS) je zn\u00e1ma svojou vysokou citlivos\u0165ou na defekty vakan\u010dn\u00e9ho typu a mono-vakancie v koncentr\u00e1ciach u\u017e od 0.1 appm. Medzi najroz\u0161\u00edrenej\u0161ie techniky PAS patria meranie doby \u017eivota pozitr\u00f3nov (PALS) a sledovanie Dopplerovho roz\u0161\u00edrenia anihila\u010dnej \u010diary (DBS). Technika PALS je zalo\u017een\u00e1 na implant\u00e1cii pozitr\u00f3nov z pozitr\u00f3nov\u00e9ho zdroja do vzorky a monitorovan\u00ed \u010dasu, ktor\u00fd uplynie od tejto implant\u00e1cie po anihil\u00e1ciu pozitr\u00f3nu s elektr\u00f3nom. Tento \u010das, tzv. doba \u017eivota pozitr\u00f3nov z\u00e1vis\u00ed od typu, ve\u013ekosti a koncentr\u00e1cie mrie\u017ekov\u00fdch defektov. Pomocou PALS mo\u017eno kvantifikova\u0165 a kvalifikova\u0165 aj najmen\u0161ie objemov\u00e9 defekty, na ktor\u00e9 nie s\u00fa citliv\u00e9 in\u00e9 techniky vr\u00e1tane elektr\u00f3novej mikroskopie. Konven\u010dn\u00e1 met\u00f3da PALS vyu\u017e\u00edvaj\u00faca r\u00e1dioizotopov\u00e9 pozitr\u00f3nov\u00e9 zdroje sa dlhodobo \u00faspe\u0161ne vyu\u017e\u00edva napr\u00edklad v programoch overovac\u00edch vzoriek jadrov\u00fdch reaktorov na pos\u00fadenie radia\u010dn\u00e9ho krehnutia. Techniky na b\u00e1ze pomal\u00fdch pozitr\u00f3nov\u00fdch zv\u00e4zkov, na druhej strane, umo\u017e\u0148uj\u00fa vy\u0161etrovanie ve\u013emi tenk\u00fdch povrchov\u00fdch vrstiev po\u0161koden\u00fdch napr\u00edklad i\u00f3novou implant\u00e1ciou alebo expoz\u00edciou koroz\u00edvnemu prostrediu.<\/p>\n\n\n\n

(Koinciden\u010dn\u00e9) sledovanie Dopplerovho roz\u0161\u00edrenia anihila\u010dnej \u010diary (C)DBS; poskytuje unik\u00e1tne inform\u00e1cie o hybnosti elektr\u00f3n-pozitr\u00f3nov\u00e9ho p\u00e1ru pred procesom ich anihil\u00e1cie. Na z\u00e1klade vybran\u00fdch parametrov W a S\u00a0je mo\u017en\u00e9 stanovi\u0165 podiel anihil\u00e1ci\u00ed na vo\u013en\u00fdch i viazan\u00fdch elektr\u00f3noch, \u010d\u00edm z\u00edskame dodato\u010dn\u00e9 inform\u00e1cie o koncentr\u00e1ci\u00e1ch defektov vakan\u010dn\u00e9ho typu ako aj o chemickom prostred\u00ed v okol\u00ed miesta anihil\u00e1cie.<\/p>\n\n\n\n

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Literat\u00fara:<\/p>\n\n\n\n

KR\u0160JAK, Vladim\u00edr – SHEN, Tielong – DEGMOV\u00c1, Jarmila – SOJAK, Stanislav – KORPAS, Erik – NOGA, Pavol – EGGER, Werner – LI, Bingsheng – SLUGE\u0147, Vladim\u00edr – GARNER, Frank A. On the helium bubble swelling in nano-oxide dispersion-strengthened steels. In Journal of Materials Science and Technology. Vol. 105, apr\u00edl (2022), s. 172-181. ISSN 1005-0302 (2022: 10.900 – IF, Q1 – JCR Best Q, 2.130 – SJR, Q1 – SJR Best Q). V datab\u00e1ze: DOI: 10.1016\/j.jmst.2021.08.004 ; SCOPUS: 2-s2.0-85115816122 ; WOS: 000797467000008 ; CC: 000797467000008.\u2028Typ v\u00fdstupu: \u010dl\u00e1nok; V\u00fdstup: zahrani\u010dn\u00fd; Kateg\u00f3ria publik\u00e1cie do 2021: ADC<\/p>\n\n\n\n

DEGMOV\u00c1, Jarmila – SONG, Yamin – LI, Bingsheng – SOJAK, Stanislav – CAO, Xingzhong – NOVOTN\u00dd, Radek – NOV\u00c1K, Michal – EGGER, Werner – KR\u0160JAK, Vladim\u00edr. A slow positron beam study of the oxidation behaviour of 310S stainless steel and alloy 800HT exposed to supercritical water. In The Journal of Supercritical Fluids. Vol. 202, (2023), Art. no. 106057 [16] s. ISSN 0896-8446 (2022: 3.900 – IF, Q2 – JCR Best Q). V datab\u00e1ze: SCOPUS: 2-s2.0-85168596868 ; WOS: 001066683800001 ; CC: 001066683800001 ; DOI: 10.1016\/j.supflu.2023.106057.\u2028Typ v\u00fdstupu: \u010dl\u00e1nok; V\u00fdstup: zahrani\u010dn\u00fd; Kateg\u00f3ria publik\u00e1cie do 2021: ADC<\/p>\n\n\n\n

KR\u0160JAK, Vladim\u00edr – SOJAK, Stanislav – PETRISKA, Martin – STR\u00cdBRNSK\u00dd, Branislav – HINCA, R\u00f3bert – H\u00daSKA, Mat\u00fa\u0161 – SLUGE\u0147, Vladim\u00edr – KOLLURI, Murthy – MARTIN, Oliver – DEGMOV\u00c1, Jarmila. Positron annihilation study of the reactor pressure vessel model steels irradiated in the high flux reactor. In Journal of Nuclear Materials. Vol. 584, (2023), Art. no. 154563 [11] s. ISSN 0022-3115 (2022: 3.100 – IF, Q1 – JCR Best Q, 1.002 – SJR, Q1 – SJR Best Q). V datab\u00e1ze: DOI: 10.1016\/j.jnucmat.2023.154563 ; WOS: 001024839800001 ; CC: 001024839800001 ; SCOPUS: 2-s2.0-85162175812.\u2028Typ v\u00fdstupu: \u010dl\u00e1nok; V\u00fdstup: zahrani\u010dn\u00fd; Kateg\u00f3ria publik\u00e1cie do 2021: ADC<\/p>\n\n\n\n

SLUGE\u0147, Vladim\u00edr – \u0160IMEG VETERN\u00cdKOV\u00c1, Jana – DEGMOV\u00c1, Jarmila – SOJAK, Stanislav – PETRISKA, Martin – NOGA, Pavol – KR\u0160JAK, Vladim\u00edr. Positron annihilation studies of Eurofer97\/ODS steels after helium ion implantation. In Nuclear Materials and Energy. Vol. 34, (2023), Art. no. 101369 [10] s. ISSN 2352-1791 (2022: 2.600 – IF, Q1 – JCR Best Q, 1.184 – SJR, Q1 – SJR Best Q). V datab\u00e1ze: DOI: 10.1016\/j.nme.2023.101369 ; WOS: 000990088500001 ; CC: 000990088500001 ; SCOPUS: 2-s2.0-85146714737.\u2028Typ v\u00fdstupu: \u010dl\u00e1nok; V\u00fdstup: zahrani\u010dn\u00fd; Kateg\u00f3ria publik\u00e1cie do 2021: ADC<\/p>\n","protected":false},"excerpt":{"rendered":"

Pozitr\u00f3nov\u00e1 anihila\u010dn\u00e1 spektroskopia (PAS) je zn\u00e1ma svojou vysokou citlivos\u0165ou na defekty vakan\u010dn\u00e9ho typu a mono-vakancie v koncentr\u00e1ciach u\u017e od 0.1 appm. Medzi najroz\u0161\u00edrenej\u0161ie techniky PAS patria meranie doby \u017eivota pozitr\u00f3nov (PALS) a sledovanie Dopplerovho roz\u0161\u00edrenia anihila\u010dnej \u010diary (DBS). Technika PALS je zalo\u017een\u00e1 na implant\u00e1cii pozitr\u00f3nov z pozitr\u00f3nov\u00e9ho zdroja do vzorky a monitorovan\u00ed \u010dasu, ktor\u00fd uplynie od tejto implant\u00e1cie po anihil\u00e1ciu pozitr\u00f3nu s elektr\u00f3nom. Tento \u010das, tzv. doba \u017eivota pozitr\u00f3nov z\u00e1vis\u00ed od typu, ve\u013ekosti a koncentr\u00e1cie mrie\u017ekov\u00fdch defektov. Pomocou PALS mo\u017eno kvantifikova\u0165 a kvalifikova\u0165 aj najmen\u0161ie objemov\u00e9 defekty, na ktor\u00e9 nie s\u00fa citliv\u00e9 in\u00e9 techniky vr\u00e1tane elektr\u00f3novej mikroskopie. Konven\u010dn\u00e1 met\u00f3da PALS vyu\u017e\u00edvaj\u00faca… <\/p>\n","protected":false},"author":1,"featured_media":972,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[10],"tags":[],"class_list":["post-681","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-vyskum-a-diagnostika-materialov"],"_links":{"self":[{"href":"https:\/\/www.ujfi.fei.stuba.sk\/en\/wp-json\/wp\/v2\/posts\/681","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ujfi.fei.stuba.sk\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.ujfi.fei.stuba.sk\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.ujfi.fei.stuba.sk\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ujfi.fei.stuba.sk\/en\/wp-json\/wp\/v2\/comments?post=681"}],"version-history":[{"count":0,"href":"https:\/\/www.ujfi.fei.stuba.sk\/en\/wp-json\/wp\/v2\/posts\/681\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.ujfi.fei.stuba.sk\/en\/wp-json\/wp\/v2\/media\/972"}],"wp:attachment":[{"href":"https:\/\/www.ujfi.fei.stuba.sk\/en\/wp-json\/wp\/v2\/media?parent=681"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ujfi.fei.stuba.sk\/en\/wp-json\/wp\/v2\/categories?post=681"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ujfi.fei.stuba.sk\/en\/wp-json\/wp\/v2\/tags?post=681"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}