Autor: Nogueira, R. A. - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Internal Friction and Microstructure of Ti and Ti-Mo Alloys Containing Oxygen
Autorzy:: Martins Jr, J. R. S.
Araújo, R. O.
Nogueira, R. A.
Grandini, C. R.
Powiązania:: https://bibliotekanauki.pl/articles/351840.pdf
Data publikacji:: 2016
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:: mechanical spectroscopy
anelasticity
internal friction
Ti-Mo alloys
interstitials
biomaterials
Opis:: Ti-Mo alloys are promising materials for use as biomaterials, because these alloys have excellent corrosion resistance and a good combination of mechanical properties such as fatigue, low elastic modulus, hardness, and wear resistance. The objective of this paper was to study the effect of heavy interstitial atoms on anelastic properties of Ti-Mo alloys using mechanical spectroscopy. The internal friction and Young’s modulus were measured as a function of temperature using dynamic mechanical analyser. The internal friction spectra were brought about by relaxation processes attributed to shortrange stress induced reorientation of interstitial and substitutional complexes in solid solution. It is suggested that the nature of the relaxing entities can be worked out in further research on Ti-Mo single crystals.
Źródło:: Archives of Metallurgy and Materials; 2016, 61, 1; 25-30
1733-3490
Pojawia się w:: Archives of Metallurgy and Materials
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Mechanical and thermal properties of commercial multilayer flexible plastic packaging materials irradiated with electron beam
Autorzy:: Oliveira, V. M.
Nogueira, B. R.
Ortiz, A. V.
Moura, E. A. B.
Powiązania:: https://bibliotekanauki.pl/articles/146772.pdf
Data publikacji:: 2008
Wydawca:: Instytut Chemii i Techniki Jądrowej
Tematy:: electron-beam radiation
multilayer packaging materials
mechanical properties
thermal properties
Opis:: The effects of electron-beam irradiation on mechanical and thermal properties were studied for two commercial multilayer structures of flexible food packaging. Both the laminated poly(ethylene terephthalate) (PET)/ low-density polyethylene (LDPE) and the coextruded LDPE/polyamide(PA)/LDPE structures were irradiated up to 120 kGy using a 1.5 MeV electron beam accelerator, at room temperature in the presence of air. Mechanical properties showed significant changes (p < 0.05), specially in sealability that was severely affected. Changes in mechanical properties were discussed in relation to the eight day and the six month period after irradiation. In addition, the DSC analysis six months after treatment showed that the fusion enthalpy of the PET/LDPE structure components increase for the LDPE from 10 kGy and decrease for the PET up to 120 kGy (p < 0.05). On the other hand, the LDPE/PA6/ LDPE presented increase in the LDPE and PA up to 120 kGy, except for LDPE at 10 and 15 kGy and PA at 5 kGy doses (p < 0.05). The effects of irradiation were less severe for the LDPE/PA6/LDPE than for the PET/LDPE. The electron-beam irradiation did not show advantageous results that could be of interest for commercial applications for the film industry, but brings important information about the packaging behavior for food producers who may decide to use irradiation as a form of cold pasteurization of their packed products.
Źródło:: Nukleonika; 2008, 53, suppl. 2; 141-144
0029-5922
1508-5791
Pojawia się w:: Nukleonika
Dostawca treści:: Biblioteka Nauki

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