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[{"key": "dc.contributor.advisor", "value": "Kataja, Markku", "language": null, "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.advisor", "value": "Retulainen, Elias", "language": null, "element": "contributor", "qualifier": "advisor", "schema": "dc"}, {"key": "dc.contributor.author", "value": "Sormunen, Tuomas", "language": null, "element": "contributor", "qualifier": "author", "schema": "dc"}, {"key": "dc.date.accessioned", "value": "2018-03-28T07:35:32Z", "language": null, "element": "date", "qualifier": "accessioned", "schema": "dc"}, {"key": "dc.date.available", "value": "2018-03-28T07:35:32Z", "language": null, "element": "date", "qualifier": "available", "schema": "dc"}, {"key": "dc.date.issued", "value": "2018", "language": null, "element": "date", "qualifier": "issued", "schema": "dc"}, {"key": "dc.identifier.other", "value": "oai:jykdok.linneanet.fi:1863480", "language": null, "element": "identifier", "qualifier": "other", "schema": "dc"}, {"key": "dc.identifier.uri", "value": "https://jyx.jyu.fi/handle/123456789/57455", "language": null, "element": "identifier", "qualifier": "uri", "schema": "dc"}, {"key": "dc.description.abstract", "value": "Paperi on stokastinen verkosto toisiinsa eri vuorovaikutusten, t\u00e4rkeimp\u00e4n\u00e4 vetysidosten, avulla sitoutuneita sellukuituja. Paperin lujuus riippuu yksitt\u00e4isten kuitusidosten lujuudesta ja sidospinta-alasta. Todellista sidospinta-alaa on vaikea m\u00e4\u00e4ritt\u00e4\u00e4 tarkasti, sill\u00e4 sitoutuminen tapahtuu molekulaarisessa mittakaavassa.\n\nMaantieteellisill\u00e4 alueilla, joilla havaitaan selkeit\u00e4 vuodenaikojen muutoksia, puun sellukuiduilla on erilaisia ominaisuuksia riippuen siit\u00e4, syntyv\u00e4tk\u00f6 kuidut kasvukauden alku- vai loppuvaiheessa. Kuidut jaetaan yleens\u00e4 kahteen luokkaan: kes\u00e4- ja kev\u00e4tpuukuituihin. N\u00e4in ollen voidaan muodostaa kolmea erilaista sidostyyppi\u00e4: kev\u00e4tpuukuidut, kes\u00e4puukuidut sek\u00e4 kev\u00e4t-kes\u00e4puusidokset. Kes\u00e4puusidokset ovat lujimpia, mutta niill\u00e4 on pienin optisesti sitoutunut ala, kun taas kev\u00e4tpuusidoksilla on suurin optisesti sitoutunut ala mutta pienin lujuus. Kev\u00e4t-kes\u00e4puusidosten sidosalan ja lujuuden arvot ovat n\u00e4iden v\u00e4limaastossa.\n\nR\u00f6ntgennanotomografia on kuvantamismenetelm\u00e4, jossa k\u00e4ytet\u00e4\u00e4n kappaleen l\u00e4p\u00e4isevi\u00e4 r\u00f6ntgens\u00e4teit\u00e4 n\u00e4ytteen 3D-mallin muodostamiseksi. N\u00e4yte kuvataan useista eri suunnista, ja jokaisen r\u00f6ntgens\u00e4teen intensiteetin vaimeneminen rekister\u00f6id\u00e4\u00e4n. Otettujen varjokuvien perusteella n\u00e4ytteest\u00e4 voidaan muodostaa rekonstruktio esimerkiksi suodatettua takaisinprojektiota k\u00e4ytt\u00e4en.\n\nSulfaattimenetelm\u00e4ll\u00e4 valmistetusta havusellumassasta muodostettiin ja kuvattiin 26 kuitusidosn\u00e4ytett\u00e4: 13 kev\u00e4t-kes\u00e4puusidosta, 7 kes\u00e4puusidosta sek\u00e4 6 kev\u00e4tpuusidosta. Kuvausten perusteella keskim\u00e4\u00e4r\u00e4inen suhteellinen kontaktiala, joka kuvausmenetelm\u00e4ll\u00e4 pystyttiin erottamaan, ei vaikuttanut merkitt\u00e4v\u00e4sti vaihtelevan sidostyyppien v\u00e4lill\u00e4. Tulokset viittaavat siihen, ett\u00e4 erot suhteellisessa kontaktialassa eiv\u00e4t kenties selit\u00e4 havaittuja lujuuseroja sidostyyppien v\u00e4lill\u00e4.", "language": "fi", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.abstract", "value": "Paper is a stochastic network of cellulose fibres that bond together by different interactions, most importantly hydrogen bonding. The strength of paper depends on the strength and the bonded area of individual fibre bonds. Since the bonding occurs in the molecular range, the actual bonded area is difficult to measure accurately.\n\nIn geographic areas with distinct seasonal changes, cellulose fibres obtained from wood have different properties depending on whether they developed early or late in the growth season. The fibres are usually divided into two categories: springwood and summerwood fibres. As such, three fibre bond types exist: springwood, summerwood, and spring-to-summerwood bonds. Summerwood bonds are the strongest in bearing load but have the lowest optically bonded area, while springwood bonds conversely have the greatest optically bonded area but are the weakest. Spring-to-summerwood bonds have intermediate values in both the strength and the bond area.\n\nX-ray nanotomography is a non-invasive imaging method that uses X-rays penetrating a body to produce a 3D representation of the sample. The sample is imaged from a number of directions, upon which the attenuation of each X-ray beam's intensity through the sample is recorded. Filtered backprojection algorithm can then be used to create a reconstruction of the sample based on the acquired shadowgraphs.\n\nIn total, 26 softwood kraft pulp cellulose fibre bonds were prepared and imaged, 13 of which were spring-to-summerwood, 7 summerwood, and 6 springwood fibre bonds. According to the results, the average relative contact area, as could be resolved with the imaging apparatus, did not seem to significantly differ between bond types. These findings suggest that the observed strength differences between bond types might not be explained by differences in relative contact area.", "language": "en", "element": "description", "qualifier": "abstract", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Submitted using Plone Publishing form by Tuomas Sormunen (tumaolso) on 2018-03-28 07:35:29.128563. 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 2018-03-28T07:35:32Z\nNo. of bitstreams: 2\nURN:NBN:fi:jyu-201803281865.pdf: 24547831 bytes, checksum: 06bae95136d92e313f3745ba26af4e76 (MD5)\nlicense.html: 4838 bytes, checksum: a93a0ab9f28687ca7e3e8a22ac29e979 (MD5)", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.description.provenance", "value": "Made available in DSpace on 2018-03-28T07:35:32Z (GMT). No. of bitstreams: 2\nURN:NBN:fi:jyu-201803281865.pdf: 24547831 bytes, checksum: 06bae95136d92e313f3745ba26af4e76 (MD5)\nlicense.html: 4838 bytes, checksum: a93a0ab9f28687ca7e3e8a22ac29e979 (MD5)\n Previous issue date: 2018", "language": "en", "element": "description", "qualifier": "provenance", "schema": "dc"}, {"key": "dc.format.extent", "value": "1 verkkoaineisto (133 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": "eng", "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": "r\u00f6ntgennanotomografia", "language": null, "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.subject.other", "value": "sidosala", "language": null, "element": "subject", "qualifier": "other", "schema": "dc"}, {"key": "dc.title", "value": "Measuring the contact area in cellulose fibre bonds using X-ray nanotomography", "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-201803281865", "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": "dc.type.ontasot", "value": "Master\u2019s thesis", "language": "en", "element": "type", "qualifier": "ontasot", "schema": "dc"}, {"key": "dc.contributor.faculty", "value": "Matemaattis-luonnontieteellinen tiedekunta", "language": "fi", "element": "contributor", "qualifier": "faculty", "schema": "dc"}, {"key": "dc.contributor.faculty", "value": "Faculty of Sciences", "language": "en", "element": "contributor", "qualifier": "faculty", "schema": "dc"}, {"key": "dc.contributor.department", "value": "Fysiikan laitos", "language": "fi", "element": "contributor", "qualifier": "department", "schema": "dc"}, {"key": "dc.contributor.department", "value": "Department of Physics", "language": "en", "element": "contributor", "qualifier": "department", "schema": "dc"}, {"key": "dc.contributor.organization", "value": "University of Jyv\u00e4skyl\u00e4", "language": "en", "element": "contributor", "qualifier": "organization", "schema": "dc"}, {"key": "dc.contributor.organization", "value": "Jyv\u00e4skyl\u00e4n yliopisto", "language": "fi", "element": "contributor", "qualifier": "organization", "schema": "dc"}, {"key": "dc.subject.discipline", "value": "Soveltava fysiikka", "language": "fi", "element": "subject", "qualifier": "discipline", "schema": "dc"}, {"key": "dc.subject.discipline", "value": "Applied Physics", "language": "en", "element": "subject", "qualifier": "discipline", "schema": "dc"}, {"key": "dc.date.updated", "value": "2018-03-28T07:35:32Z", "language": null, "element": "date", "qualifier": "updated", "schema": "dc"}, {"key": "yvv.contractresearch.funding", "value": "0", "language": null, "element": "contractresearch", "qualifier": "funding", "schema": "yvv"}, {"key": "dc.type.coar", "value": "http://purl.org/coar/resource_type/c_bdcc", "language": null, "element": "type", "qualifier": "coar", "schema": "dc"}, {"key": "dc.rights.accesslevel", "value": "openAccess", "language": "fi", "element": "rights", "qualifier": "accesslevel", "schema": "dc"}, {"key": "dc.type.publication", "value": "masterThesis", "language": null, "element": "type", "qualifier": "publication", "schema": "dc"}, {"key": "dc.subject.oppiainekoodi", "value": "4023", "language": null, "element": "subject", "qualifier": "oppiainekoodi", "schema": "dc"}, {"key": "dc.subject.yso", "value": "sellu", "language": null, "element": "subject", "qualifier": "yso", "schema": "dc"}, {"key": "dc.format.content", "value": "fulltext", "language": null, "element": "format", "qualifier": "content", "schema": "dc"}, {"key": "dc.rights.url", "value": "https://rightsstatements.org/page/InC/1.0/", "language": null, "element": "rights", "qualifier": "url", "schema": "dc"}, {"key": "dc.type.okm", "value": "G2", "language": null, "element": "type", "qualifier": "okm", "schema": "dc"}]
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