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33. |
- Brantberg, K, et al.
(författare)
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The binaural interaction component in human ABR is stable within the 0- to 1-ms range of interaural time differences
- 1999
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Ingår i: Audiology & neuro-otology. - : S. Karger AG. - 1420-3030. ; 4:2, s. 88-94
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Tidskriftsartikel (refereegranskat)abstract
- The effect of unilaterally delayed acoustic stimuli on binaural interaction was studied in 12 subjects with normal hearing. Auditory brainstem response (ABR) was obtained in the midline between the forehead and the neck, and click stimuli were unilaterally delayed at 0.2-ms intervals in the 0- to 1-ms range. Binaural interaction was evaluated by measuring the β wave in the binaural difference waveform, i.e. the remainder after subtracting the binaurally evoked registration from the sum of the two monaural registrations. Computation of the binaural difference waveform showed the β wave amplitude to be relatively stable throughout the 0- to 1-ms range of interaural time differences. This finding suggests stable binaural interaction within the range of interaural time differences where binaural click stimuli induce a binaurally fused intracranial image.
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37. |
- Eskilsson, K, et al.
(författare)
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Self-aggregation of triblock copolymers at the solid silica-water interface
- 1999
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Ingår i: Langmuir. - 0743-7463 .- 1520-5827. ; 15, s. 5150-5157
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Tidskriftsartikel (refereegranskat)abstract
- We report on the adsorption and surface aggregation behavior of triblock copoly(ethylene oxide-tetrahydrofuran-ethylene oxide) copolymers, EOn/2THFmEOn/2, at the silica-water interface. In this work, we have used both time-resolved fluorescence spectroscopy and atomic force microscopy to study the morphology of the adsorbed layers. We confirm previous suggestions that the copolymers self-assemble at the silica surface to form discrete micelle-like structures. The surface aggregation, however, starts at a much lower copolymer concentration than the corresponding micellization process in solution. The time-resolved fluorescence measurements reveal that the copolymer aggregates are smaller at the surface than those in bulk solution. The AFM measurements that were performed clearly confirm the existence of discrete micelle-like copolymer aggregates at the silica surface. An interesting result seen in the AFM surface topography images is that, for the high molecular weight copolymer, we observe no surface aggregates at some parts of surface. We believe this is related to the polydispersity of the copolymer. Single high molecular weight copolymers may effectively compete for surface area with surface aggregates formed by a copolymer fraction of lower molecular weight.
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38. |
- Eskilsson, K, et al.
(författare)
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Self-aggregation of triblock copolymers at the solid silica-water interface
- 1999
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Ingår i: LANGMUIR. - : AMER CHEMICAL SOC. - 0743-7463. ; 15:15, s. 5150-5157
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- We report on the adsorption and surface aggregation behavior of triblock copoly(ethylene oxide-tetrahydrofuran-ethylene oxide) copolymers, EOn/2THFmEOn/2, at the silica-water interface. In this work, we have used both time-resolved fluorescence spectrosco
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