11. Primerjava visokoelastičnih lastnosti gumenih zmesi, merjenih z DMA in TMA : diplomsko deloLucija Marolt, 2023, diplomsko delo Ključne besede: guma, gumene zmesi, DMA, TMA, DSC, FT-IR, visokoelastične lastnosti, diplomsko delo Objavljeno v DiRROS: 21.02.2024; Ogledov: 460; Prenosov: 140 Celotno besedilo (1,52 MB) |
12. Mechanisms of premature fracture in modular neck stems made of CoCrMo/Ti6Al4V and Ti6Al4V/Ti6Al4V alloyDrago Dolinar, Miro Gorenšek, Klemen Avsec, Barbara Šetina, Matej Hočevar, Matjaž Godec, Borut Žužek, Mojca Debeljak, Monika Jenko, John T. Grant, Boštjan Kocjančič, 2023, izvirni znanstveni članek Povzetek: In this paper, we present the mechanisms of premature fracture of modular neck stems in two case studies: (I) when the neck and stem are both made of the same Ti6Al4V alloy, and (II) when the neck and stem are made from two different alloys, CoCrMo and Ti6Al4V alloy. Our study integrates two orthopedic patients who have undergone primary uncemented THA for usual indications in two orthopedic centers (Community Health Centre and University Medical Centre). Both centers are part of the national public health care system. Both surgeries were performed by two skilled orthopedic surgeons with more than 10 years of experience in THA. The survivorship of the modular neck of cast CoCrMo alloy was 24 months. The survivorship of the modular neck from Ti6Al4V alloy was 84 months. Multivariate analyses were performed to assess the differences in the fretting, corrosion, and fatigue of the two prematurely failed modular neck stems: stereo light microscopy (SLM), scanning electron microscopy (SEM), X-ray energy-dispersive spectroscopy (EDS), and electron backscatter diffraction (EBSD). Patient demographic information, including sex, age, body mass index, survivorship of implants, and reason for the revision, was collected from medical records. We found that fretting and fatigue occurred on both neck-stem retrievals due to additional galvanic corrosion, but the CoCrMo/Ti6Al4V alloy system suffered more corrosion due to additional galvanic corrosion and fractured earlier than the Ti6Al4V/Ti6Al4V metal alloy system. Both metallic alloy systems used in this application are known to be highly corrosion-resistant, but the bio-tribo-corrosion processes need to be understood in detail and characterized so that appropriate improvements in design and materials can be made. Ključne besede: total hip arthroplasty, modular neck, Ti6Al4V alloy, CoCrMo alloy, corrosion Objavljeno v DiRROS: 07.02.2024; Ogledov: 536; Prenosov: 284 Celotno besedilo (5,12 MB) Gradivo ima več datotek! Več... |
13. Tehnične smernice za ohranjanje in rabo genskih virov : lesnika in drobnica = Malus sylvestris, Pyrus pyrasterMirko Perušek, Gregor Božič, Robert Brus, Hojka Kraigher, 2012, strokovni članek Ključne besede: genski viri, drevesne vrste, tehnične smernice, lesnika, Malus sylvestris, drobnica, Pyrus pyraster, Slovenija Objavljeno v DiRROS: 20.12.2023; Ogledov: 556; Prenosov: 146 Celotno besedilo (417,15 KB) |
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15. Modificirajući uticaj na neke endokrine žlezde miša kod kasnih posledica subletalnog jonizacionog zračenjaMiroslav Kališnik, Olga Vraspir-Porenta, Metka Logonder-Mlinšek, Marjeta Zorc, Tatjana Lejko-Zupanc, Alenka Rus-Gaši, Draga Štiblar-Martinčič, Janez Škrk, 1979, izvirni znanstveni članek Objavljeno v DiRROS: 14.09.2023; Ogledov: 512; Prenosov: 147 Celotno besedilo (558,37 KB) |
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20. Sinteza epoksidne smole na osnovi lignina : diplomsko deloKlemen Peršin, 2022, diplomsko delo Ključne besede: epoksidna smola, lignin, FTIR, DMA, DSC, TGA, Fourierjeva transformacija, dinamična mehanska analiza, diferenčna dinamična kalorimetrija, termogravimetrična analiza, diplomsko delo Objavljeno v DiRROS: 23.03.2023; Ogledov: 741; Prenosov: 229 Celotno besedilo (2,96 MB) |