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- 2019
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Tidskriftsartikel (refereegranskat)
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| 2. |
- Stepanova, K. V., et al.
(författare)
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Influence of annealing on the structure of nanoporous oxide films on the surface of titanium‒aluminum powder alloy
- 2016
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Ingår i: Journal of Surface Investigation. X-ray, Synchrotron and Neutron Techniques. - Moscow : Maik Nauka/Interperiodica. - 1027-4510. ; 10:5, s. 933-941
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Tidskriftsartikel (refereegranskat)abstract
- Oxide films obtained during anodization of Ti‒40% Al sintered powder samples in fluorine-containing electrolytes are investigated. With scanning electron microscopy and X-ray phase analysis, it is demonstrated that an X-ray amorphous nanoporous anodic oxide film is formed on the surface of the powder microparticles under optimal anodization conditions. After annealing at T = 1093 K in air and vacuum (10‒2 Pa), the oxide films are revealed to crystallize with its regular porous structure retained. The composition of the polycrystalline anodic-oxide films annealed in air is a mixture involving TiO2 (anatase and rutile) and α- and γ-Al2O3 phases and Ti2O3 and Al2TiO5 traces. The vacuum annealing process makes it possible to identify TiO2, in which anatase is the main phase, α- and γ-Al2O3, and Ti2O3 and TiO traces. However, rutile is not revealed. The presented results indicate that the application of the anodic nanostructuring of Ti‒40% Al powders is promising for the obtainment of new photocatalytic active nanomaterials. © 2016, Pleiades Publishing, Ltd.
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| 3. |
- Ahmadi, Asghar, et al.
(författare)
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A Classification System for Teachers’ Motivational Behaviors Recommended in Self-Determination Theory Interventions
- 2023
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Ingår i: Journal of Educational Psychology. - Washington, DC : American Psychological Association (APA). - 0022-0663 .- 1939-2176. ; 115:8, s. 1158-1176
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Tidskriftsartikel (refereegranskat)abstract
- Teachers’ behavior is a key factor that influences students’ motivation. Many theoretical models have tried to explain this influence, with one of the most thoroughly researched being self-determination theory (SDT). We used a Delphi method to create a classification of teacher behaviors consistent with SDT. This is useful because SDT-based interventions have been widely used to improve educational outcomes. However, these interventions contain many components. Reliably classifying and labeling those components is essential for implementation, reproducibility, and evidence synthesis.We used an international expert panel (N = 34) to develop this classification system. We started by identifying behaviors from existing literature, then refined labels, descriptions, and examples using the Delphi panel’s input. Next, the panel of experts iteratively rated the relevance of each behavior to SDT, the psychological need that each behavior influenced, and its likely effect on motivation. To create a mutually exclusive and collectively exhaustive list of behaviors, experts nominated overlapping behaviors that were redundant, and suggested new ones missing from the classification. After three rounds, the expert panel agreed upon 57 teacher motivational behaviors (TMBs) that were consistent with SDT. For most behaviors (77%), experts reached consensus on both the most relevant psychological need and influence on motivation. Our classification system provides a comprehensive list of TMBs and consistent terminology in how those behaviors are labeled. Researchers and practitioners designing interventions could use these behaviors to design interventions, to reproduce interventions, to assess whether these behaviors moderate intervention effects, and could focus new research on areas where experts disagreed. © 2023 American Psychological Association
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| 4. |
- Aksel Jacobsen, Freja, et al.
(författare)
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A Role for the Non-Receptor Tyrosine Kinase Abl2/Arg in Experimental Neuroinflammation
- 2018
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Ingår i: Journal of Neuroimmune Pharmacology. - New York, NY : Springer-Verlag New York. - 1557-1890 .- 1557-1904. ; 13:2, s. 265-276
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Tidskriftsartikel (refereegranskat)abstract
- Multiple sclerosis is a neuroinflammatory degenerative disease, caused by activated immune cells infiltrating the CNS. The disease etiology involves both genetic and environmental factors. The mouse genetic locus, Eae27, linked to disease development in the experimental autoimmune encephalomyelitis (EAE) model for multiple sclerosis, was studied in order to identify contributing disease susceptibility factors and potential drug targets for multiple sclerosis. Studies of an Eae27 congenic mouse strain, revealed that genetic variation within Eae27 influences EAE development. The Abl2 gene, encoding the non-receptor tyrosine kinase Arg, is located in the 4,1 megabase pair long Eae27 region. The Arg protein plays an important role in cellular regulation and is, in addition, involved in signaling through the B- and T-cell receptors, important for the autoimmune response. The presence of a single nucleotide polymorphism causing an amino acid change in a near actin-interacting domain of Arg, in addition to altered lymphocyte activation in the congenic mice upon immunization with myelin antigen, makes Abl2/Arg a candidate gene for EAE. Here we demonstrate that the non-synonymous SNP does not change Arg’s binding affinity for F-actin but suggest a role for Abl kinases in CNS inflammation pathogenesis by showing that pharmacological inhibition of Abl kinases ameliorates EAE, but not experimental arthritis. © 2018 The Author(s)
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| 5. |
- Stepanova, Kristina V., et al.
(författare)
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The structure and properties of nanoporous anodic oxide films on titanium aluminide
- 2019
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Ingår i: Kondensirovannye Sredy Mezhfaznye Granitsy. - Voronezh : Voronezh State University. - 1606-867X. ; 21:1, s. 135-145
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Tidskriftsartikel (refereegranskat)abstract
- The paper presents a structural analysis of nanoporous oxide films formed by anodizing γTiAl (Ti-40 wt. %Al) samples in fluoride containing water and waterless electrolytes. Methods and methodology. Two groups of samples produced from (1) ingots and (2) sintered powder were used for anodizing. X-ray diffraction, X-ray electron spectroscopy, and scanning electron microscopy were used to analyse the structure of the films. The band gap values of anodized powder samples were estimated based on their UV-vis absorption spectra. The reaction of degradation of methyl orange under UV-vis irradiation was used to examine the photocatalytic activity of anodized TiAl powder. Results. Anodizing performed under optimal conditions in a 10 % H2SO4+0.15 % HF water electrolyte for both groups of samples results in the formation of self-organized nanoporous films of about 350 nm thickness with effective pore diameter <dp>= (70±10) nm. All the studied oxide films are heterogeneous, consist mostly of TiO2 : Al2O3 in a ratio of approximately 1:1, and have an X-ray amorphous structure. The optical band gap value of anodized powders determined by their UV absorption was Eg∌2.5 eV. It is much less than Eg of nanotubular titanium dioxide (Eg∌3.4 eV). The study also found that the concentration of methyl orange decreases under visible light irradiation in the presence of anodized TiAl powder. Conclusion. Photocatalytic activity of the developed heterogeneous films might be initiated by the visible light irradiation (λ∌480-510 nm). In other words, the new composite "TiAl powder/TiO2-Al2O3 nanoporous oxide" exhibits activity under the visible light radiation which results in the photocatalytic degradation of methyl orange. The obtained results can be successfully used for the production of new powder nanomaterials which show photocatalytic activity under visible light irradiation.
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