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[{"key": "dc.contributor.advisor", "value": "Louhelainen, Jarmo", "language": null, "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.advisor", "value": "Laakso, Atso", "language": null, "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.advisor", "value": "Pakkanen, Hannu", "language": null, "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.author", "value": "Piirainen, Samuli", "language": null, "element": "contributor", "qualifier": "author", "schema": "dc"}, {"key": "dc.date.accessioned", "value": "2017-04-18T05:08:34Z", "language": null, "element": "date", "qualifier": "accessioned", "schema": "dc"}, {"key": "dc.date.available", "value": "2017-04-18T05:08:34Z", "language": null, "element": "date", "qualifier": "available", "schema": "dc"}, {"key": "dc.date.issued", "value": "2017", "language": null, "element": "date", "qualifier": "issued", "schema": "dc"}, {"key": "dc.identifier.other", "value": "oai:jykdok.linneanet.fi:1695172", "language": null, "element": "identifier", "qualifier": "other", "schema": "dc"}, {"key": "dc.identifier.uri", "value": "https://jyx.jyu.fi/handle/123456789/53611", "language": null, "element": "identifier", "qualifier": "uri", "schema": "dc"}, {"key": "dc.description.abstract", "value": "Korkeasaantoisen havusulfaattimassan s\u00e4hk\u00f6magneettisen s\u00e4teilyn aiheuttama kellastuminen aiheutuu puun natiiveista sek\u00e4 sulfaattikeiton aikana syntyvist\u00e4 kromoforeista. Kromoforit ovat kemiallisia rakenteita, jotka absorboivat s\u00e4teily\u00e4 n\u00e4kyv\u00e4n valon alueelta, mink\u00e4 seurauksena syntyy v\u00e4rej\u00e4. Kellastumisen aiheutumiseksi kemialliseen rakenteeseen on synnytt\u00e4v\u00e4 kromoforisia rakenteita, jotka absorboivat n\u00e4kyv\u00e4\u00e4 valoa sini-viher-alueella. Havupuiden osalta kromoforisia rakenteita esiintyy ligniiniss\u00e4, uuteaineissa sek\u00e4 hiilihydraattien johdannaisissa. \n\nLopputy\u00f6ni kirjallisessa osassa perehdyt\u00e4\u00e4n havupuiden natiivien sek\u00e4 sulfaattikeiton aikana syntyvien kromoforien ominaisuuksiin sek\u00e4 muodostumismekanismeihin. Lis\u00e4ksi kirjallisuusosassa tarkastellaan massojen erilaisia v\u00e4rinmuutoksen stabilointikeinoja. \n\nErikoisty\u00f6ss\u00e4 tutkittiin Stora Enson Varkauden tehtaan korkeasaantoisessa havusulfaattimassassa havaittuja v\u00e4rinmuutoksia, jotka aiheutuivat s\u00e4teilyst\u00e4. Massasta valmistettiin massakakkuja, joiden v\u00e4rinmuutoksia seurattiin UV-s\u00e4teilyn ja loisteputkivalon alla. Referenssin\u00e4ytteen\u00e4 oli s\u00e4teilytt\u00e4m\u00e4t\u00f6n n\u00e4yte. V\u00e4rinmuutoksen seurantaan k\u00e4ytettiin spektrofotometri\u00e4 sek\u00e4 ATR-FTIR-laitetta. Mitattuja v\u00e4rikoordinaatiston arvoja vertailtiin FTIR-spektreihin, joiden muutoksista l\u00f6ydettiin vastaavuuksia. FTIR-spektrin aaltoluvulla 1730 cm-1 oleva piikki korreloi s\u00e4teilytyksen alkuvaiheen nopean tummumisen kanssa voimakkaasti. Kyseisen piikin intensiteetin aiheuttajiksi ep\u00e4ill\u00e4\u00e4n joko hemiselluloosan johdannaisia tai ligniinin konjugoitumattomia rakenteita. Aaltoluvulla 1650 cm-1 oleva piikki korreloi osittain n\u00e4ytteiden b*-arvon kanssa, mik\u00e4 my\u00f6s todisti teorian s\u00e4teilyn aiheuttamasta massan hapettumisesta.", "language": "fi", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Submitted using Plone Publishing form by Samuli Piirainen (reansapi) on 2017-04-18 05:08:33.202903. Form: Pro gradu -lomake (https://kirjasto.jyu.fi/julkaisut/julkaisulomakkeet/pro-gradu-lomake). JyX data: [jyx_publishing-allowed (fi) =True]", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Submitted by jyx lomake-julkaisija (jyx-julkaisija.group@korppi.jyu.fi) on 2017-04-18T05:08:34Z\nNo. of bitstreams: 2\nURN:NBN:fi:jyu-201704182006.pdf: 4398761 bytes, checksum: ab100d9365e0f7635cff784fcfef9d56 (MD5)\nlicense.html: 4827 bytes, checksum: 7b64a36301c5093879f44110163f61e0 (MD5)", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Made available in DSpace on 2017-04-18T05:08:34Z (GMT). No. of bitstreams: 2\nURN:NBN:fi:jyu-201704182006.pdf: 4398761 bytes, checksum: ab100d9365e0f7635cff784fcfef9d56 (MD5)\nlicense.html: 4827 bytes, checksum: 7b64a36301c5093879f44110163f61e0 (MD5)\n Previous issue date: 2017", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.format.extent", "value": "1 verkkoaineisto (88 sivua)", "language": null, "element": "format", "qualifier": "extent", "schema": "dc"}, {"key": "dc.format.mimetype", "value": "application/pdf", "language": null, "element": "format", "qualifier": "mimetype", "schema": "dc"}, {"key": "dc.language.iso", "value": "fin", "language": null, "element": "language", "qualifier": "iso", "schema": "dc"}, {"key": "dc.rights", "value": "In Copyright", "language": "en", "element": "rights", "qualifier": null, "schema": "dc"}, {"key": "dc.subject.other", "value": "korkeasaantoinen massa", "language": null, "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "sulfaattimassa", "language": null, "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "v\u00e4rinmuutokset", "language": null, "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "spektrofotometri", "language": null, "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.title", "value": "S\u00e4teilyn aiheuttamat v\u00e4rinmuutokset korkeasaantoisessa massassa", "language": null, "element": "title", "qualifier": null, "schema": "dc"}, {"key": "dc.type", "value": "master thesis", "language": null, "element": "type", "qualifier": null, "schema": "dc"}, {"key": "dc.identifier.urn", "value": "URN:NBN:fi:jyu-201704182006", "language": null, "element": "identifier", "qualifier": "urn", "schema": "dc"}, {"key": "dc.type.ontasot", "value": "Pro gradu -tutkielma", "language": "fi", "element": "type", "qualifier": "ontasot", "schema": "dc"}, {"key": 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