{"id":6218,"date":"2026-10-19T09:48:38","date_gmt":"2026-10-19T09:48:38","guid":{"rendered":"https:\/\/phd.hi.is\/doktorsvorn\/doktorsvorn-i-efnafraedi-kusse-sukuta-bersha\/"},"modified":"2026-10-19T09:48:38","modified_gmt":"2026-10-19T09:48:38","slug":"doktorsvorn-i-efnafraedi-kusse-sukuta-bersha","status":"publish","type":"phd_defence","link":"https:\/\/phd.hi.is\/en\/doktorsvorn\/doktorsvorn-i-efnafraedi-kusse-sukuta-bersha\/","title":{"rendered":"Doktorsv\u00f6rn \u00ed efnafr\u00e6\u00f0i – Kusse Sukuta Bersha"},"content":{"rendered":"
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Streymi:\u00a0 https:\/\/livestream.com\/hi\/doktorsvornkussesukutabersha<\/a> <\/strong><\/p>\n

Doktorsefni:<\/strong>\u00a0Kusse Sukuta Bersha<\/p>\n

Heiti ritger\u00f0ar:<\/strong>\u00a0At\u00f3mbygging m\u00e1lmnan\u00f3klasa fundin \u00fat fr\u00e1 AC-STEM myndum (Determination of the Atomic Structure of Metal Nanoclusters from Aberration Corrected Scanning Transmission Electron Microscope Images)<\/p>\n

Andm\u00e6lendur:<\/strong>
<\/strong>Dr. Jaakko Akola, pr\u00f3fessor vi\u00f0 NTNU \u00ed \u00der\u00e1ndheimi, Noregi
Dr. G\u00edsli H\u00f3lmar J\u00f3hannesson, deildarstj\u00f3ri hj\u00e1 Keili<\/p>\n

Lei\u00f0beinandi:<\/strong>\u00a0\u00a0Dr. Hannes J\u00f3nsson, pr\u00f3fessor vi\u00f0 Raunv\u00edsindadeild H\u00e1sk\u00f3la \u00cdslands<\/p>\n

Einnig \u00ed doktorsnefnd:
<\/strong>Dr. Egill Sk\u00falason, pr\u00f3fessor vi\u00f0 I\u00f0na\u00f0arverkfr\u00e6\u00f0i-, v\u00e9laverkfr\u00e6\u00f0i- og t\u00f6lvunarfr\u00e6\u00f0ideild\u00a0H\u00e1sk\u00f3la \u00cdslands
Dr. Elvar \u00d6rn J\u00f3nsson, s\u00e9rfr\u00e6\u00f0ingur vi\u00f0 Raunv\u00edsindastofnun H\u00e1sk\u00f3lans.<\/p>\n

Doktorsv\u00f6rn st\u00fdrir:<\/strong>\u00a0Dr. Einar \u00d6rn Sveinbj\u00f6rnsson, pr\u00f3fessor og deildarforseti Raunv\u00edsindadeildar H\u00e1sk\u00f3la \u00cdslands<\/p>\n

\u00c1grip<\/strong><\/p>\n

\u00c1kv\u00f6r\u00f0un \u00e1 uppr\u00f6\u00f0un at\u00f3ma \u00ed nan\u00f3kl\u00f6sum er erfitt verkefni en mj\u00f6g mikilv\u00e6gt til a\u00f0 \u00f6\u00f0last skilning \u00e1 efna- og e\u00f0lisfr\u00e6\u00f0ilegum eiginleikum \u00feeirra. N\u00fdleg m\u00e6lit\u00e6kni, spegilvillulei\u00f0r\u00e9tt og skannandi gegnuml\u00fdsingar rafeindasm\u00e1sj\u00e1 (e. aberration corrected scanning transmission electron microscope, AC-STEM) hefur gefi\u00f0 mikilv\u00e6gar uppl\u00fdsingar um sl\u00edk kerfi. \u00de\u00f3tt m\u00e6lit\u00e6kin s\u00e9u h\u00e1\u00fer\u00f3u\u00f0 er \u00farvinnslan \u00e1 m\u00e6lig\u00f6gnunum, sem er tv\u00edv\u00ed\u00f0 mynd af klasanum \u00e1 at\u00f3mskala, oft \u00f3n\u00e1kv\u00e6m og ekki magnbundin enn sem komi\u00f0 er.
\u00cd verkefninu er \u00fer\u00f3u\u00f0 a\u00f0fer\u00f0afr\u00e6\u00f0i til a\u00f0 vinna \u00far myndum sem koma \u00far AC-STEM m\u00e6lingum. \u00dear er mat \u00e1 samr\u00e6minu milli \u00fatreikna\u00f0rar myndar vi\u00f0 m\u00e6ldu myndirnar \u00e1samt mati \u00e1 orku nan\u00f3klasans nota\u00f0 \u00ed bestunarreikningum til a\u00f0 \u00e1kvar\u00f0a hnit at\u00f3manna. Fyrst er a\u00f0fer\u00f0in pr\u00f3fu\u00f0 fyrir l\u00edk\u00f6n af AC-STEM myndum fyrir b\u00e6\u00f0i reglulega og \u00f3reglulega Au55 nan\u00f3klasa. Ekki er nau\u00f0synlegt a\u00f0 at\u00f3min myndi ra\u00f0ir \u00ed klasanum og einnig er h\u00e6gt a\u00f0 finna r\u00e9ttu hnitin \u00fe\u00f3tt su\u00f0 s\u00e9 til sta\u00f0ar. \u00de\u00e1 er a\u00f0fer\u00f0inni beitt \u00e1 m\u00e6lda AC-STEM mynd af Au55 klasa. \u00deetta er s\u00e9rstaklega krefjandi d\u00e6mi \u00fev\u00ed sta\u00f0setning at\u00f3manna er \u00f3regluleg \u00ed \u00feessum klasa. Greining \u00e1 sta\u00f0bundinni uppr\u00f6\u00f0un at\u00f3manna s\u00fdnir a\u00f0 klasinn er samsettur \u00far tveimur hlutum, annar me\u00f0 str\u00fakt\u00fareiningar sem einkenna \u00edk\u00f3sahedru og hinn d\u00e6miger\u00f0ur fyrir at\u00f3m \u00ed kristal og \u00fear er jafnframt a\u00f0 finna b\u00fat af fl\u00f6tu yfirbor\u00f0i. Orkulandslag klasans er kanna\u00f0 me\u00f0 reikningum \u00e1 l\u00e1gmarksorkuferlum milli str\u00fakt\u00farsins sem gefur besta samsv\u00f6run vi\u00f0 m\u00e6lingarnar og annarra str\u00fakt\u00fara sem einnig s\u00fdna g\u00f3\u00f0a samsv\u00f6run. \u00cd lj\u00f3s kemur a\u00f0 orkuh\u00f3larnir milli \u00feessara str\u00fakt\u00fara eru gjarnan l\u00e1gir og sl\u00edkar umra\u00f0anir at\u00f3manna geta \u00fev\u00ed grei\u00f0lega \u00e1tt s\u00e9r sta\u00f0 \u00e1 me\u00f0an \u00e1 m\u00e6lingunum stendur og \u00fear me\u00f0 haft \u00e1hrif \u00e1 AC-STEM myndina. Ferlarnir lei\u00f0a einnig \u00ed lj\u00f3s n\u00fdja str\u00fakt\u00fara sem sumir hafa l\u00e6gri DFT orku og gefa n\u00e6stum jafng\u00f3\u00f0a samsv\u00f6run vi\u00f0 myndina sem f\u00e9kkst me\u00f0 m\u00e6lingunum.
\u00cdtarleg \u00farvinnsla \u00e1 AC-STEM myndum me\u00f0 \u00fatreikningum fyrir l\u00edk\u00f6n af str\u00fakt\u00farum krefst \u00feess a\u00f0 \u00e1rei\u00f0anlegt t\u00f6lulegt mat s\u00e9 h\u00e6gt a\u00f0 leggja \u00e1 hversu g\u00f3\u00f0 samsv\u00f6runin er. \u00cd lj\u00f3s kemur a\u00f0 einf\u00f6ld summa af kva\u00f0rati fr\u00e1vikanna \u00ed styrk allra d\u00edlanna \u00e1 myndinni er ekki g\u00f3\u00f0ur m\u00e6likvar\u00f0i \u00e1 g\u00e6\u00f0in. A\u00f0fer\u00f0 sem byggist \u00e1 hra\u00f0a\u00f0ri greiningu \u00e1 afgerandi kennileitum (speeded up robust features, SURF) er \u00fer\u00f3u\u00f0 og notu\u00f0 til a\u00f0 bera saman reikna\u00f0ar myndir og m\u00e6lda fyrir Au55 klasann. \u00deessi a\u00f0fer\u00f0 gefur magnbundi\u00f0 mat \u00e1 samsv\u00f6runina sem samr\u00e6mist vel ni\u00f0urst\u00f6\u00f0um sem f\u00e1st vi\u00f0 sko\u00f0un myndanna.<\/p>\n

Um doktorsefni\u00f0<\/strong><\/p>\n

Kusse f\u00e6ddist \u00ed Kons\u00f3 \u00ed Su\u00f0ur-E\u00fe\u00ed\u00f3p\u00edu 1983 og \u00e1 \u00ferj\u00e1r systur og tvo br\u00e6\u00f0ur sem enn b\u00faa \u00fear. Hann l\u00e6r\u00f0i e\u00f0lisfr\u00e6\u00f0i vi\u00f0 Mekelle-h\u00e1sk\u00f3la og vann \u00fear sem a\u00f0sto\u00f0arma\u00f0ur \u00ed tv\u00f6 \u00e1r eftir \u00fatskrift. \u00de\u00e1 f\u00f3r hann \u00ed Erasmus MS-n\u00e1m sem nefnist „Color in Informatics and Media Technology (CIMET)\u201d og stunda\u00f0i n\u00e1mi\u00f0 vi\u00f0 tvo h\u00e1sk\u00f3la, Joensuu-h\u00e1sk\u00f3la (n\u00fa Eastern Finland-h\u00e1sk\u00f3li) og H\u00e1sk\u00f3lann \u00ed Granada \u00e1 Sp\u00e1ni. Kusse hefur n\u00fa sest a\u00f0 \u00e1 \u00cdslandi \u00e1samt eiginkonu sinni og tveimur sonum.
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