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Träfflista för sökning "db:Swepub ;pers:(Persson Anders);srt2:(2010-2011)"

Sökning: db:Swepub > Persson Anders > (2010-2011)

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1.
2.
  • Andersson, Gunnar, et al. (författare)
  • Coaching och handledning av grupper - inom universitets- och högskoleutbildning (e-bok)
  • 2010
  • Bok (övrigt vetenskapligt)abstract
    • Denna bok handlar om ett förändringsprojekt vid Lunds universitet som syftade till att förkorta studietiderna utan att kandidat- och magisteruppsatsernas vetenskapliga kvalitet påverkades negativt. Det omedelbara resultatet blev att andelen uppsatser som blev färdiga inom föreskriven tidsram ökade från under 10 % till över 50 % samtidigt som deras vetenskapliga kvalitet inte försämrades. I boken beskrivs och problematiseras projektets arbetssätt och resultat. Samtliga kandidat- och magisteruppsatser handleddes i grupper om 5-7 deltagare. Parallellt med grupphandledning infördes coaching för handledarna. Coachingen innebar att handledarna fortlöpande handleddes och "utbildades" i grupp samtidigt som de själva handledde sina studenter i grupp. I boken beskrivs hur man som handledare går tillväga för att skapa och upprätthålla ett konstruktivt gruppklimat som befrämjar goda studentprestationer. Vidare beskrivs i detalj hur det går till att coacha handledare. Behovet av förändringar som dessa sätts också in i det större sammanhang som utgörs av den högre utbildningens förvandling till massutbildning. Frågan "Vad är rätt kvalitet?" ställs också. Boken riktar således blicken mot hur studenter ska komma ut ur och inte endast in i högskolan. Den har skrivits i syfte att komma universitetslärare till undsättning i massutbildningen, kollegor som liksom vi har uppfattningen att fungerande universitetsutbildning kan och bör vara något omvälvande.
3.
  • Andreev, N. E., et al. (författare)
  • Analysis of laser wakefield dynamics in capillary tubes
  • 2010
  • Ingår i: New Journal Of Physics. - Iop Publishing. - 1367-2630. ; 12
  • Tidskriftsartikel (refereegranskat)abstract
    • A general approach to the modifications of the spectrum of a laser pulse interacting with matter is elaborated and used for spectral diagnostics of laser wakefield generation in guiding structures. Analytical predictions of the laser frequency red shift due to the wakefield excited in a capillary waveguide are confirmed by self-consistent modeling results. The role of ionization blue shift, and nonlinear laser pulse and wakefield dynamics on the spectrum modification, is analyzed for recent experiments on plasma wave excitation by an intense laser pulse guided in hydrogen-filled glass capillary tubes up to 8 cm long. The dependence of the spectral frequency shift, measured as a function of filling pressure, capillary tube length and incident laser energy, is in excellent agreement with the simulation results, and the associated longitudinal accelerating field is in the range 1-10 GV m(-1).
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4.
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5.
  • Axelsson, Emil, 1978-, et al. (författare)
  • The Design and Implementation of Feldspar: an Embedded Language for Digital Signal Processing
  • 2010
  • Ingår i: IFL 2010, the 22nd Symposium on Implementation and Application of Functional Languages.
  • Konferensbidrag (övrigt vetenskapligt)abstract
    • Feldspar is a Domain Specific Language, embedded in Haskell, for programming Digital Signal Processing algorithms. The final aim of a Feldspar program is to generate low level code with good performance. Still, we chose to provide the user with a purely functional DSL. The language is implemented as a minimal, deeply embedded core language, with shallow extensions built upon it. This paper presents full details of the essential parts of the implementation. Our initial conclusion is that this approach works well in our domain, although much work remains.
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6.
  • Axelsson, Emil, 1978-, et al. (författare)
  • The Design and Implementation of Feldspar: An Embedded Language for Digital Signal Processing
  • 2011
  • Ingår i: Lecture Notes in Computer Science, Implementation and Application of Functional Languages. - 03029743. - 978-3-642-24275-5 ; 6647, s. 121-136
  • Konferensbidrag (refereegranskat)abstract
    • Feldspar is a domain specific language, embedded in Haskell, for programming digital signal processing algorithms. The final aim of a Feldspar program is to generate low level code with good performance. Still, we chose to provide the user with a purely functional DSL. The language is implemented as a minimal, deeply embedded core language, with shallow extensions built upon it. This paper presents full details of the essential parts of the implementation. Our initial conclusion is that this approach works well in our domain, although much work remains.
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7.
  • Batani, D., et al. (författare)
  • Effects of laser prepulse on proton generation
  • 2010
  • Ingår i: Radiation Effects and Defects in Solids. - Taylor & Francis Group. - 1042-0150. ; 165:6-10, s. 794-802
  • Konferensbidrag (refereegranskat)abstract
    • Prepulse is a major issue for laser generation of protons, often limiting the performances of laser sources. Here, we show the use of prepulse (1013W/cm2, ns duration) to actively manipulate the proton beam direction. Under oblique high-intensity irradiation (approximate to 1019W/cm2, ps duration) of the thin foil target, and for low prepulse intensities, the proton beam is directed away from the ounperturbedo target normal. Observations are discussed in terms of target normal sheath acceleration, in combination with a laser-controllable shock locally deforming the target surface.
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8.
  • Batani, D., et al. (författare)
  • Effects of laser prepulse on proton generation
  • 2010
  • Ingår i: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. - Elsevier. - 0168-9002. ; 620:1, s. 76-82
  • Konferensbidrag (refereegranskat)abstract
    • Low-intensity laser prepulse ( < 10(13) W/cm(2), ns duration) are a major issue in experiments on laser-generation of protons, often limiting the performances of proton sources produced by high-intensity lasers (approximate to 10(19) W/cm(2), ps or fs duration) Several effects are associated to the prepulse and are discussed in this contribution: i) Destruction of thin foil targets by the shock generated by the laser prepulse ii) Creation of preplasma on target front side affecting laser absorption iii) Deformation of target rear side iv) Whole displacement of thin foil targets affecting focusing condition In particular, we show that under oblique high-intensity irradiation and for low prepulse intensities, the proton beam is directed away from the target normal. Deviation is towards the laser forward direction, with an angle that increases with the level and duration of the ASE pedestal. Also, for a given laser pulse, beam deviation increases with proton energy. The observations are discussed in terms of Target Normal Sheath Acceleration, in combination with a laser-controllable shock wave locally deforming the target surface. (C) 2010 Elsevier B.V. All rights reserved.
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9.
  • Batani, D., et al. (författare)
  • Effects of laser prepulses on laser-induced proton generation
  • 2010
  • Ingår i: New Journal Of Physics. - Iop Publishing. - 1367-2630. ; 12
  • Tidskriftsartikel (refereegranskat)abstract
    • Low-intensity laser prepulses (<10(13) W cm(-2), nanosecond duration) are a major issue in experiments on laser-induced generation of protons, often limiting the performances of proton sources produced by high-intensity lasers (approximate to 10(19) W cm(-2), picosecond or femtosecond duration). Depending on the intensity regime, several effects may be associated with the prepulse, some of which are discussed in this paper: (i) destruction of thin foil targets by the shock generated by the laser prepulse; (ii) creation of preplasma on the target front side affecting laser absorption; (iii) deformation of the target rear side; and (iv) whole displacement of thin foil targets affecting the focusing condition. In particular, we show that under oblique high-intensity irradiation and for low prepulse intensities, the proton beam is directed away from the target normal. Deviation is towards the laser forward direction, with an angle that increases with the level and duration of the ASE pedestal. Also, for a given laser pulse, the beam deviation increases with proton energy. The observations are discussed in terms of target normal sheath acceleration, in combination with a laser-controllable shock wave locally deforming the target surface.
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10.
  • Burza, Matthias, et al. (författare)
  • Hollow microspheres as targets for staged laser-driven proton acceleration
  • 2011
  • Ingår i: New Journal of Physics. - Institute of Physics Publishing (IOPP). - 1367-2630. ; 13, s. 013030
  • Tidskriftsartikel (refereegranskat)abstract
    • A coated hollow core microsphere is introduced as a novel targetin ultra-intense laser–matter interaction experiments. In particular, it facilitates staged laser-driven proton acceleration by combining conventional target normal sheath acceleration (TNSA), power recycling of hot laterally spreading electrons and staging in a very simple and cheap target geometry. During TNSA of protons from one area of the sphere surface, laterally spreading hot electrons form a charge wave. Due to the spherical geometry, this wave refocuses on the opposite side of the sphere, where an opening has been laser micromachined.This leads to a strong transient charge separation field being set up there, which can post-accelerate those TNSA protons passing through the hole at the right time. Experimentally, the feasibility of using such targets is demonstrated. A redistribution is encountered in the experimental proton energy spectra, as predicted by particle-in-cell simulations and attributed to transient fields set up by oscillating currents on the sphere surface.
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  • Resultat 1-10 av 76
  • [1]234567...8Nästa
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