| 1. |
- Aulin, Tor, 1948, et al.
(författare)
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Crossover product accumulate codes
- 2008
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Ingår i: Electronics Letters. - 1350-911X .- 0013-5194. ; 44:20, s. 1211-1212
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Tidskriftsartikel (refereegranskat)abstract
- A class of turbo-like codes with a crossover component, termed crossover product accumulate (CPA) codes is proposed. This structure is a serial concatenation of a crossover parallel concatenated code and an accumulator through an interleaver. A detailed iterative decodingscheme for CPA codes is described. Simulations show that different crossover depth makes CPA codes have different convergence in bit error rate (BER) performance, and a proper crossover structure produces faster convergence.
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| 2. |
- Johansson, Mattias Erik, 1980, et al.
(författare)
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The Dual-Beam mini-DOAS technique - measurements of volcanic gas emission, plume height and plume speed with a single instrument
- 2009
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Ingår i: Bulletin of Volcanology. - 0258-8900 .- 1432-0819. ; 71, s. 747-751
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Tidskriftsartikel (refereegranskat)abstract
- The largest error in determining volcanic gas fluxes using ground based optical remote sensing instruments is typically the determination of the plume speed, and in the case of fixed scanning instruments also the plume height. We here present a newly developed technique capable of measuring plume height, plume speed and gas flux using one single instrument by simultaneously collecting scattered sunlight in two directions. The angle between the two measurement directions is fixed, removing the need for time consuming in-field calibrations. The plume height and gas flux is measured by traversing the plume and the plume speed by performing a stationary measurement underneath the plume. The instrument was tested in a field campaign in May 2005 at Mt. Etna, Italy, where the measured results are compared to wind fields derived from a meso-scale meteorological model (MM5). The test and comparison show that the instrument is functioning and capable of estimating wind speed at the plume height.
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| 3. |
- Liu, Hui, et al.
(författare)
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Confinement effect on scattering states in a thin lead film: Field-induced resonance states in the high-bias regime of scanning tunneling microscopy
- 2007
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Ingår i: Physical Review B. ; 76:11
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Tidskriftsartikel (refereegranskat)abstract
- Field-induced resonance states in the high-bias regime of scanning tunneling microscopy are used to couple and probe the scattering states above the vacuum level in a thin lead film. The resonance energies show a bilayer oscillation as a function of film thickness. Theoretical modeling unveils that the oscillation results from the confinement of the highly excited scattering states by the quantum well, yielding a bilayer phase modulation at the boundaries where they are coherently coupled to the external states.
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