| 1. |
- Cederström, Björn, et al.
(författare)
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Focusing hard X-rays with old LPs
- 2000
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Ingår i: Nature. - : Springer Science and Business Media LLC. - 0028-0836 .- 1476-4687. ; 404:6781, s. 951-951
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Tidskriftsartikel (refereegranskat)
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| 2. |
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| 3. |
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| 4. |
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| 5. |
- Chugai, N. N., et al.
(författare)
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Circumstellar interaction of the type Ia supernova 2002ic
- 2004
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Ingår i: Monthly notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966. ; 355, s. 627-637
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Tidskriftsartikel (refereegranskat)abstract
- We propose a model to account for the bolometric light curve, the quasi-continuum and the CaII emission features of the peculiar type Ia supernova (SN) 2002ic, which exploded in a dense circumstellar envelope. The model suggests that the SN Ia had the maximum possible kinetic energy and that the ejecta expand in an approximately spherically symmetric (possibly clumpy) circumstellar environment. The CaII and the quasi-continuum are emitted by shocked SN ejecta that underwent deformation and fragmentation in the intershock layer. Modelling of the CaII triplet implies that the contribution of the OI 8446-Åline is about 25 per cent of the 8500-Åfeature on day 234, which permits us to recover the flux in the CaII 8579-Åtriplet from the flux of 8500-Åblend reported by Deng et al. We use the CaII doublet and triplet fluxes on day 234 to derive the electron temperature (~ 4400 K) in the CaII line-emitting zone and the ratio of the total area of dense fragments to the area of the shell, S/S0~ 102. We argue that CaII bands and the quasi-continuum originate from different zones of the shocked ejecta that reflect the abundance stratification of the supernova.
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| 6. |
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| 7. |
- Holmqvist, Kenneth, et al.
(författare)
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Reading or scanning? A study of newspaper and net paper reading.
- 2003
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Ingår i: The mind's eye: cognitive and applied aspects of eye movement research. - 0444510206 ; , s. 657-670
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Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
- Net paper readers have been shown to read deeper into articles than newspaper readers. It has also been claimed that newspaper readers rather scan than read newspapers. Do these findings mean that net paper readers read proportionally more than newspaper readers? This paper presents results showing that in fact net paper readers scan more and read less than newspaper readers. We furthermore investigate whether this result can be expained by the difference in layout, navigation structure and purpose of reading between the two media.
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| 8. |
- Johnsen, S. E., et al.
(författare)
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A single particle investigation on the kinetics of metal hydride materials
- 2003
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Ingår i: Journal of the Electrochemical Society. - : The Electrochemical Society. - 0013-4651 .- 1945-7111. ; 150:5, s. A629-A637
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Tidskriftsartikel (refereegranskat)abstract
- Potential step chronoamperometry and electrochemical impedance spectroscopy measurements were performed on single metal hydride (MH) particles. For the alpha phase, the bulk diffusion coefficient and the absorption/adsorption rate parameters were determined. Materials produced by atomization, melt spinning, and conventional casting were investigated. The melt spun and conventional cast materials were identical and the atomized material similar in composition. The particles from the cast and the melt spun material were shaped like parallelepipeds. A corresponding equation for this geometry, for diffusion coupled to an absorption/adsorption reaction was developed. It was found that materials produced by melt spinning exhibited lower bulk diffusion (1.7 x 10(-14) m(2) s(-1)) and absorption/adsorption reaction rate (1.0 x 10(-8) ms(-1)), compared to materials produced by conventional casting (1.1 x 10(-13) m(2) s(-1) and 5.5 x 10(-8) ms(-1), respectively). In addition, the influence of particle active surface and relative diffusion length were discussed. It was concluded that there are uncertainties connected to these properties, which may explain the large distribution in the kinetic parameters measured on MH particles.
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| 9. |
- Karlsson, A., et al.
(författare)
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Nanofluidic networks based on surfactant membrane technology
- 2003
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Ingår i: Analytical Chemistry. - 0003-2700 .- 1520-6882. ; 75:11, s. 2529-37
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Tidskriftsartikel (refereegranskat)abstract
- We explore possibilities to construct nanoscale analytical devices based on lipid membrane technology. As a step toward this goal, we present nanotube-vesicle networks with fluidic control, where the nanotube segments reside at, or very close (<2 microm) to optically transparent surfaces. These nanofluidic systems allow controlled transport as well as LIF detection of single nanoparticles. In the weak-adhesion regime, immobilized vesicles can be approximated as perfect spheres with nanotubes attached at half the height of the vesicle in the axial (z) dimension. In the strong-adhesion regime (relative contact area, Sr* approximately 0.3), nanotubes can be adsorbed to the surface with a distance to the interior of the nanotubes defined by the membrane thickness of approximately 5 nm. Strong surface adsorption restricts nanotube self-organization, enabling networks of nanotubes with arbitrary geometries. We demonstrate LIF detection of single nanoparticles (30-nm-diameter fluorescent beads) inside single nanotubes. Transport of nanoparticles was induced by a surface tension differential applied across nanotubes using a hydrodynamic injection protocol. Controlled transport in nanotubes together with LIF detection enables construction of nanoscale fluidic devices with potential to operate with single molecules. This opens up possibilities to construct analytical platforms with characteristic length scales and volume orders of magnitudes smaller than employed in traditional microfluidic devices.
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| 10. |
- Karlsson, A., et al.
(författare)
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Nanofluidic networks based on surfactant membrane technology
- 2003
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Ingår i: Analytical Chemistry. - 0003-2700 .- 1520-6882. ; 75:11, s. 2529-37
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Tidskriftsartikel (refereegranskat)abstract
- We explore possibilities to construct nanoscale analytical devices based on lipid membrane technology. As a step toward this goal, we present nanotube-vesicle networks with fluidic control, where the nanotube segments reside at, or very close (
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