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- Alderson, J. Charles, et al.
(författare)
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Implementing and evaluating a self-assessment mechanism for the web-based Language and Style course
- 2006
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Ingår i: Language and Literature. - : SAGE Publications. - 0963-9470 .- 1461-7293. ; 15:3, s. 291-306
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Tidskriftsartikel (refereegranskat)abstract
- This article reports on the project to design and implement a web-based mechanism for formative self-assessment, to be used as part of Mick Short's online stylistics course, Language and Style (see the preface to this issue for details). Using the self-assessment mechanism, students can compare their own performance on extended academic tasks (the stylistic analysis of three literary texts – a poem, a piece of prose fiction and a drama extract) with benchmarked sample answers. In this article we describe the process of developing benchmarks for the self-assessment mechanism and explain how this mechanism works in practice. Finally, we discuss students’ reactions to the self-assessment instruments, as part of our own assessment of their validity and pedagogical value.
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| 5. |
- Kravtsov, E, et al.
(författare)
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Fine-tuning of the spin-density-wave state in Cr/V heterostructures via hydrogen uptake
- 2009
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Ingår i: Journal of Physics. - : IOP Publishing. - 0953-8984 .- 1361-648X. ; 21:33, s. 336004-
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Tidskriftsartikel (refereegranskat)abstract
- We show that the magnetic state in rather thick Cr films can be finely tuned via hydrogen uptake into adjacent vanadium layers at rather low hydrogen pressures. By changing the hydrogen concentration and, hence, the electronic structure in the V layers, it is possible to affect the global properties of spin-density waves (SDWs) in Cr layers, including the SDW period and the Neel temperature. We provide direct experimental evidence that hydrogen uptake into V layers can be used to switch between incommensurate and commensurate SDW states in a reproducible way.
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| 6. |
- Kravtsov, Evgeny, et al.
(författare)
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Onset of spin-density-wave antiferromagnetism in Cr/V multilayers
- 2007
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Ingår i: Physical Review B. Condensed Matter and Materials Physics. - 1098-0121 .- 1550-235X. ; 76:2, s. 024421-
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Tidskriftsartikel (refereegranskat)abstract
- Spin-density-wave (SDW) magnetism in a series of Cr/V heterostructures with different Cr thicknesses was systematically investigated by combined resistivity, neutron, and synchrotron scattering measurements. We show that the onset of the bulklike SDW state comes through several necessary steps from a paramagnetic state through a commensurate SDW to an incommensurate SDW. The Néel temperature for the incommensurate SDW is found to scale with Cr thickness and reaches the bulk value at a Cr thickness of about 2000 Å. The proximity effect from Cr/V interfaces is found to lead to (i) the appearance of a 50-Å magnetically dead Cr layer near Cr/V interfaces and (ii) suppression of the spin-flip transition and stabilization of a single-domain SDW with out-of-plane spins and out-of-plane propagation wave vector. Finally, we show that the SDW period increases with decreasing Cr thickness and becomes temperature independent in sufficiently thin Cr layers.
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