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  • 2851.
    Zhang, Hanmin
    Karlstad University, Faculty of Technology and Science, Department of Physics and Electrical Engineering.
    Adatom-induced metal/semiconductor transitions on Ag/Si(111) and Ag/Ge(111) surfaces2003Conference paper (Refereed)
  • 2852.
    Zhang, Hanmin
    et al.
    Karlstad University, Faculty of Technology and Science, Department of Physics and Electrical Engineering.
    Balasubramanian, T.
    Uhrberg,, R. I. G.
    Core-level photoelectron spectroscopy study of the Au/Si(111) 5×2,  α−3  √ ×3  √ ,  β−3  √ ×3  √ ,  and 6×6  surfaces2001In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Phys. Rev. B 65, 035314 (2001), Vol. 65, no 3Article in journal (Refereed)
  • 2853.
    Zhang, Hanmin
    et al.
    Karlstad University, Faculty of Technology and Science, Department of Physics and Electrical Engineering.
    Balasubramanian, T.
    Uhrberg,, R. I. G.
    Metal to semiconductor transition on Ag/Ge(111): surface electronic structure of the √3 × √3, √39 × √39  and 6x6 surfaces2001In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 63, no 19Article in journal (Refereed)
  • 2854.
    Zhang, Hanmin
    et al.
    Karlstad University, Faculty of Technology and Science, Department of Physics and Electrical Engineering.
    Balasubramanian, T.
    Uhrberg,, R. I. G.
    Surface electronic structure of the √3 × √3, √39 × √39 and 6 × 6 surfaces of Ag/Ge(111): observation of a metal to semiconductor transition2000Conference paper (Refereed)
  • 2855.
    Zhang, Hanmin
    et al.
    Karlstad University, Faculty of Technology and Science, Department of Physics and Electrical Engineering.
    Balasubramanian, T.
    Uhrberg,, R. I. G.
    Surface electronic structure of the √3 × √3, √39 × √39 and 6 × 6 surfaces of Ag/Ge(111): observation of a metal to semiconductor transition2001In: Applied Surface Science, ISSN 0169-4332, E-ISSN 1873-5584, Vol. 175, p. 237-242Article in journal (Refereed)
  • 2856.
    Zhang, Hanmin
    et al.
    Karlstad University, Faculty of Technology and Science, Department of Physics and Electrical Engineering.
    Balasubramanian, T.
    Uhrberg,, R. I. G.
    Surface electronic structure study of Au/Si(111) reconstructions: Observation of a crystal to glass transition2002In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 66, no 16Article in journal (Refereed)
  • 2857.
    Zhang, Hanmin
    et al.
    Karlstad University, Faculty of Technology and Science, Department of Physics and Electrical Engineering.
    Balasubramanian, T.
    Uhrberg, R.I.G.
    Comparative Study of the Electron Structure of Sn/Ge(111) and Sn/Si(111): Indications of a Low Temperature Phase Transition2000Conference paper (Refereed)
  • 2858.
    Zhang, Hanmin
    et al.
    Karlstad University, Faculty of Technology and Science, Department of Physics and Electrical Engineering.
    Balasubramanian, T.
    Uhrberg, R.I.G.
    Photoelectron Spectroscopy of the 5x2, alpha-√3 × √3, beta-√3 × √3, and 6x6 phases of Au/Si(111)2000Conference paper (Refereed)
  • 2859.
    Zhang, Hanmin
    et al.
    Karlstad University, Faculty of Technology and Science, Department of Physics and Electrical Engineering.
    Ericsson, Leif
    Karlstad University, Faculty of Technology and Science, Department of Physics and Electrical Engineering. Karlstad University, Faculty of Technology and Science, Materials Science.
    Johansson, Lars
    Karlstad University, Faculty of Technology and Science, Department of Physics and Electrical Engineering.
    Photoemission and NEXAFS Studies of PTCDA on Sn/Si(111)2√3x2√32010Conference paper (Other academic)
  • 2860.
    Zhang, Hanmin
    et al.
    Karlstad University, Faculty of Technology and Science, Department of Physics and Electrical Engineering.
    Ericsson, Leif
    Karlstad University, Faculty of Technology and Science, Department of Physics and Electrical Engineering.
    Johansson, Lars
    Karlstad University, Faculty of Technology and Science, Department of Physics and Electrical Engineering.
    PTCDA induced reconstruction on Sn/Si(111)-2√3×2√32012In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 85, no 24, p. 245317-1-245317-5Article in journal (Refereed)
    Abstract [en]

    The electronic structures of the Sn/Si(111)-2√3×2√3 surface and deposited 3,4,9,10-perylene tetracarboxylic dianhydride (PTCDA) have been studied by use of high-resolution photoelectron spectroscopy and scanning tunneling microscopy. On deposition, PTCDA molecules form a 4√3×2√3 periodicity superposed on the substrate. The new reconstruction is caused by a charge transfer between the Sn/Si(111)-2√3×2√3 surface and the molecules, as indicated by a new component of the Sn 4d core level that is shifted toward higher binding energy. In contrast to earlier reports, the charge provided by Sn is given to carbonyl C atoms instead of O atoms. This is evidenced by a new component in the C 1s core-level spectra, which is shifted toward lower binding energy. The charge transfer also induces a splitting in the highest occupied molecular orbital level of PTCDA seen in the valence band structure.

  • 2861.
    Zhang, Hanmin
    et al.
    Karlstad University, Faculty of Technology and Science, Department of Physics and Electrical Engineering.
    Ericsson, Leif
    Karlstad University, Faculty of Technology and Science, Department of Physics and Electrical Engineering.
    Johansson, Lars
    Karlstad University, Faculty of Technology and Science, Department of Physics and Electrical Engineering.
    PTCDA on Sn/Si(111)-2√3×2√32012Conference paper (Refereed)
  • 2862.
    Zhang, Hanmin
    et al.
    Karlstad University, Faculty of Technology and Science, Department of Physics and Electrical Engineering.
    Gustafsson, Jörgen
    Karlstad University, Faculty of Technology and Science, Department of Physics and Electrical Engineering.
    Johansson, Lars
    Karlstad University, Faculty of Technology and Science, Department of Physics and Electrical Engineering.
    Electronic structure of PTCDA on Sn/Si(111)-√3×√32011In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, ISSN ISSN 1550-235x (online), 1098-0121 (print), Vol. 84, no 20, p. 205420-1-205420-8Article in journal (Refereed)
    Abstract [en]

    The electronic structures of PTCDA films on Sn/Si(111)-√3×√3 have been studied by high-resolution photoelectron spectroscopy (PES) and near-edge x-ray absorption fine structure (NEXAFS). There is a clear chemical interaction between PTCDA molecules and the Sn/Si(111)-√3×√3 surface, as indicated by new components in Sn 4d core levels that are shifted to higher binding energies. The chemical interaction is also evidenced by new components in the O-1s and C-1s core-level spectra. The new components are shifted to lower binding energies and have their origins from two reactions between Sn dangling bonds and the PTCDA molecules. One reaction is located at the anhydride O atom and the other is at the carbonyl C atom. These reactions also induce modifications in the HOMO and LUMO levels seen in the valence band and NEXAFS spectra. For thin films, the NEXAFS results suggest a tilting molecular configuration with respect to the substrate, while for the thicker films, there is an improved ordering of the molecular orientation to the substrate.

  • 2863.
    Zhang, Hanmin
    et al.
    Karlstad University, Faculty of Technology and Science, Department of Physics and Electrical Engineering.
    Gustafsson, Jörgen
    Johansson, Lars
    Karlstad University, Faculty of Technology and Science, Department of Physics and Electrical Engineering. Karlstad University, Faculty of Technology and Science, Materials Science.
    Electronic Structure Studies of PTCDA on Ag/Si(111)-sqrt3xsqrt32007Conference paper (Refereed)
  • 2864.
    Zhang, Hanmin
    et al.
    Karlstad University, Faculty of Technology and Science, Department of Physics and Electrical Engineering.
    Gustafsson, Jörgen
    Karlstad University, Faculty of Technology and Science, Department of Physics and Electrical Engineering.
    Johansson, Lars
    Karlstad University, Faculty of Technology and Science, Department of Physics and Electrical Engineering.
    Photoemission and NEXAFS Studies of PTCDA on Sn/Si(111)√3x√32009Conference paper (Refereed)
  • 2865.
    Zhang, Hanmin
    et al.
    Karlstad University, Faculty of Technology and Science, Department of Physics and Electrical Engineering.
    Gustafsson, Jörgen
    Karlstad University, Faculty of Technology and Science, Department of Physics and Electrical Engineering.
    Johansson, Lars
    Karlstad University, Faculty of Technology and Science, Department of Physics and Electrical Engineering.
    STM study of the electronic structure of PTCDA on Ag/Si(111)-√3×√32010In: Chemical Physics Letters, ISSN 0009-2614, E-ISSN 1873-4448, Vol. 485, no 1-3, p. 69-76Article in journal (Refereed)
    Abstract [en]

    PTCDA molecules were evaporated onto the Ag/Si(111)-√3×√3 surface. Simple HOMO and LUMO models have been made to explain the STM images of the square and herringbone phases. The charge transfer from the substrate and the H-bonding between the molecules play crucial roles for the formation of these phases. We found that their electronic structures are strongly modified by the moleculesubstrate and intermolecular interactions. As a result, the HOMO-LUMO gaps of the PTCDA films are different for different phases and thicknesses. The increase in the HOMO-LUMO gaps with film thicknesses is discussed based on the surface and the interface polarization effect

  • 2866.
    Zhang, Hanmin
    et al.
    Karlstad University, Faculty of Technology and Science, Department of Physics and Electrical Engineering.
    Gustafsson, Jörgen
    Johansson, Lars
    Karlstad University, Faculty of Technology and Science, Department of Physics and Electrical Engineering.
    Surface atomic structure of Ag/Si(111)√3 × √32006In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 74, no 20Article in journal (Refereed)
  • 2867.
    Zhang, Hanmin
    et al.
    Karlstad University, Faculty of Technology and Science, Department of Physics and Electrical Engineering.
    Gustafsson, Jörgen
    Johansson, Lars
    Karlstad University, Faculty of Technology and Science, Department of Physics and Electrical Engineering.
    The tip role on STM images of Ag/Si(111)√3 × √32007In: Journal of Physics: Conference Series, ISSN 1742-6596, Vol. 61, no 1Article in journal (Refereed)
  • 2868.
    Zhang, Hanmin
    et al.
    Karlstad University, Faculty of Technology and Science, Department of Physics and Electrical Engineering.
    Gustafsson, Jörgen
    Johansson, Lars
    Karlstad University, Faculty of Technology and Science, Department of Physics and Electrical Engineering.
    The tip role on STM images of Ag/Si(111)√3 × √32006Conference paper (Refereed)
  • 2869.
    Zhang, Hanmin
    et al.
    Karlstad University, Faculty of Technology and Science, Department of Physics and Electrical Engineering.
    Hirvonen Grytzelius, Joakim
    Karlstad University, Faculty of Technology and Science, Department of Physics and Electrical Engineering.
    Johansson, Lars
    Karlstad University, Faculty of Technology and Science, Department of Physics and Electrical Engineering.
    Electronic structure of Mn/Ge(111)-√3×√3 thin films studied by photoelectron spectroscopy2009Conference paper (Refereed)
  • 2870.
    Zhang, Hanmin
    et al.
    Karlstad University, Faculty of Technology and Science, Department of Physics and Electrical Engineering.
    Jemander, S. T.
    Lin, N.
    Hansson, G. V.
    Uhrberg, R. I. G.
    Origin of 3x3 diffraction on the Sn1-xSix /Si(111)sqrt3xsqrt3 surface2003In: Surface Science, ISSN 0039-6028, E-ISSN 1879-2758, Vol. 531, no 1, p. 21-28Article in journal (Refereed)
  • 2871.
    Zhang, Hanmin
    et al.
    Karlstad University, Faculty of Technology and Science, Department of Physics and Electrical Engineering.
    Johansson, Lars
    Karlstad University, Faculty of Technology and Science, Department of Physics and Electrical Engineering.
    STM study of PTCDA on Sn/Si(111)-2 root 3 x 2 root 32016In: Journal of Chemical Physics, ISSN 0021-9606, E-ISSN 1089-7690, Vol. 144, no 12, article id 124701Article in journal (Refereed)
    Abstract [en]

    The electronic structures of perylene tetracarboxylic dianhydride on Sn/Si(111)-2 root 3 x 2 root 3 have been studied by scanning tunneling microscopy and spectroscopy. Individual molecules have been investigated at 0.15 ML, while at 0.3 ML molecules formed short rods. At 0.6 ML, the molecular rods interacted with each other, coupling with the substrate and forming a new 4 root 3 x 2 root 3 super structure. At 0.9 ML, the surface was further reconstructed and consisted of strips with two and three rods of molecules. We found that these surface structures are strongly modified by the molecule/substrate and the intermolecular interactions. As a result, the HOMO-LUMO gaps of these molecules change with respect to the phases and the thickness. For a single molecular layer of the 4 root 3 x 2 root 3 phase, the HOMO-LUMO levels were split with a gap of approximately 2.1 eV, which is caused by charge transfer from the substrate to the molecules. (C) 2016 AIP Publishing LLC.

  • 2872.
    Zhang, Hanmin
    et al.
    Karlstad University, Faculty of Technology and Science, Department of Physics and Electrical Engineering.
    Sakamoto,, K.
    Uhrberg,, R. I. G.
    Comprehensive study of the metal/semiconductor character of adatom-induced Ag/Si(111) reconstructions2001In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Phys. Rev. B 64, 245421 (2001), Vol. 64, no 24Article in journal (Refereed)
  • 2873.
    Zhang, Hanmin
    et al.
    Karlstad University, Faculty of Technology and Science, Department of Physics and Electrical Engineering.
    Sakamoto, K.
    Uhrberg, R. I. G.
    High temperature annealing and surface photovoltage shift on Si(111)7x72008In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 78, no 3Article in journal (Refereed)
  • 2874.
    Zhang, Hanmin
    et al.
    Karlstad University, Faculty of Technology and Science, Department of Physics and Electrical Engineering.
    Sakamoto, K.
    Uhrberg, R. I. G.
    Semiconductor-Metal-Semiconductor Transition: Valence Band Photoemission Study of Ag/Si(111) Surfaces2001Conference paper (Refereed)
  • 2875.
    Zhang, Hanmin
    et al.
    Karlstad University, Faculty of Technology and Science, Department of Physics and Electrical Engineering.
    Sakamoto, K.
    Uhrberg, R. I. G.
    Semiconductor-metal-semiconductor transition: valence band photoemission study of Ag/Si(111) surfaces2002In: Applied Surface Science, ISSN 0169-4332, E-ISSN 1873-5584, Vol. 190, no 1-4, p. 103-107Article in journal (Refereed)
  • 2876.
    Zhang, Hanmin
    et al.
    Karlstad University, Faculty of Technology and Science, Department of Physics and Electrical Engineering.
    Sakamoto, K.
    Uhrberg, R. I. G.
    Surface electronic structure of K and Cs-induced sqrt21xsqrt21 phases on Ag/Si(111)sqrt3xsqrt32004In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 70, no 24Article in journal (Refereed)
  • 2877.
    Zhang, Hanmin
    et al.
    Karlstad University, Faculty of Technology and Science, Department of Physics and Electrical Engineering.
    Sakamoto, K.
    Uhrberg,, R. I. G.
    Surface electronic structures of Au-induced reconstructions on the Ag/Ge(111)-sqrt3xsqrt3 surface2002Conference paper (Refereed)
  • 2878.
    Zhang, Hanmin
    et al.
    Karlstad University, Faculty of Technology and Science, Department of Physics and Electrical Engineering.
    Sakamoto, K.
    Uhrberg,, R. I. G.
    Surface electronic structures of Au-induced reconstructions on the Ag/Ge(111)sqrt3xsqrt3 surface2003In: Surface Science, ISSN 0039-6028, E-ISSN 1879-2758, Vol. 934, p. 532-535Article in journal (Refereed)
  • 2879.
    Zhang, Hanmin
    et al.
    Karlstad University, Faculty of Technology and Science, Department of Physics and Electrical Engineering.
    Sakamoto, Kazuyuki
    Hansson, G.V.
    Uhrberg, R.I.G.
    High temperature annealing and surface photovoltage shifts on Si(111)7x72008In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 78, no 3Article in journal (Refereed)
  • 2880.
    Zhang, Hanmin
    et al.
    Karlstad University, Faculty of Technology and Science, Department of Physics and Electrical Engineering.
    Uhrberg, R. I. G.
    Ag/Si(111)sqrt(3)×sqrt(3): Surface band splitting and the IET-model2006In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 74, no 19-15Article in journal (Refereed)
  • 2881.
    Zhang, Hanmin
    et al.
    Karlstad University, Faculty of Technology and Science, Department of Physics and Electrical Engineering.
    Uhrberg,, R. I. G.
    Atomic structures of Ag/Ge(111)sqrt39xsqrt39 and 6x6 surfaces studied by STM: observations of bias dependent reconstruction transformations2003In: Applied Surface Science, ISSN 0169-4332, E-ISSN 1873-5584, Appl. Surf. Sci., 212-213, 353 (2003), Vol. 212-213, p. 353-359Article in journal (Refereed)
  • 2882.
    Zhang, Hanmin
    et al.
    Karlstad University, Faculty of Technology and Science, Department of Physics and Electrical Engineering.
    Uhrberg, R. I. G.
    Reinvestigation of the surface state band splitting on Ag/Si(111)sqrt3xsqrt32005Conference paper (Refereed)
  • 2883.
    Zhang, Hanmin
    et al.
    Karlstad University, Faculty of Technology and Science, Department of Physics and Electrical Engineering.
    Uhrberg,, R. I. G.
    Surface reconstruction manipulation by STM2004Conference paper (Refereed)
  • 2884.
    Zhang, Hanmin
    et al.
    Karlstad University, Faculty of Technology and Science, Department of Physics and Electrical Engineering.
    Uhrberg, R.I.G.
    Direct Manipulation of Surface Reconstructions by STM2002Conference paper (Refereed)
  • 2885.
    Zhang, Hanmin
    et al.
    Karlstad University, Faculty of Technology and Science, Department of Physics and Electrical Engineering.
    Uhrberg, R.I.G.
    Scanning Tunneling Microscopy Study of Ag/Ge(111): Observation of Surface Reconstruction Transformations2003In: Surface Science, ISSN 0039-6028, E-ISSN 1879-2758, Vol. 546, no 1-2, p. L789-L796Article in journal (Refereed)
  • 2886. Zharnikov, M
    et al.
    Shaporenko, A
    Adlkofer, K
    Johansson, Lars
    Karlstad University, Faculty of Technology and Science, Department of Physics and Electrical Engineering. Karlstad University, Faculty of Technology and Science, Materials Science.
    Tanaka, M
    Grunze, M
    Functionalization of GaAs surfaces with aromatic self-assembled monolayers2003Conference paper (Refereed)
  • 2887. Zhen, Y.
    et al.
    Quian, J.
    Follmann, K.
    Hayward, T.
    Nilsson, Thomas
    Karlstad University, Faculty of Technology and Science, Department of Chemistry and Biomedical Sciences.
    Dahn, M.
    Hilmi, Y.
    Hamer, A.
    Hosler, J. P.
    Fergusson-Miller, S.
    Overexpression and purification of cytochrome c oxidase fromRhodobacter1998In: Protein Expression and Purification 13, 326-336Article in journal (Refereed)
  • 2888. Ziegler, K.J.
    et al.
    Lyons, D.M.
    Holmes, J.D.
    Erts, D.
    Polyakov, B.
    Svensson, Krister
    Karlstad University, Faculty of Technology and Science, Department of Physics and Electrical Engineering.
    Olin, H.
    Olsson, E.
    Bistable nanoelectromechanical devices2004In: Applied Physics Letters, Vol. 84, no 20, p. 4074-Article in journal (Refereed)
  • 2889.
    Zinderland, Ingela
    Karlstad University, Faculty of Technology and Science.
    Geometrins betydelse inom matematiken2007Independent thesis Basic level (degree of Bachelor), 10 points / 15 hpStudent thesis
    Abstract [sv]

    Den här uppsatsen berör ett möjligt samband mellan dagens elevers dåliga geometrikunskaper å ena sidan och dåliga kunskaper i hela ämnet matematik å andra sidan. Många elever i Sverige i årskurs nio går idag ut med betyget icke godkänd. Det är ett faktum som oroar och behöver åtgärdas, för kommande generationers väl. Undersökningen har befäst misstanken som författaren burit inom sig, att geometri inte studeras om tidigare i historien. Kursplanen i matematik som är föränderlig framhåller till exempel inte geometrin lika tydligt som den framhölls i tidigare läroplaner. Ett antal lärare och elever har intervjuats för att få en bild av dagsäget. Här kan man bland annat skönja att lärare inte undervisar i geometri på samma sätt som de gjorde förr och inte alltid i paritet med sina värderingar och inställningar. Elever saknar bland annat många direkta kunskaper i geometri och har tyvärr inte alltid de rätta verktygen för att nå fram till godtagbara lösningar. De verkar trots allt intresserade, vilket i sig är en av deviktigaste förutsättningarna till att nå kunskap. De summerade resultaten i denna uppsats an kanske inspirera ochbli en grogrund för läsare att fortsätta och utveckladenna frskning. En konstruktiv debatt som alltid är till gagn för utvecklingen vore en annan önskvärd effekt.

  • 2890. Zuppiroli, L.
    et al.
    Si-Ahmed, L.
    Kamaras, K.
    Nüesch, F.
    Bussac, M.N.
    Ades, D.
    Siove, A.
    Moons, Ellen
    Karlstad University, Faculty of Technology and Science, Department of Physics and Electrical Engineering. Karlstad University, Faculty of Technology and Science, Materials Science.
    Grätzel, M.
    Self-Assembled Monolayers as Interfaces for Organic Opto-electronic Devices1999In: Eur. Phys. J. B 11, 3 (1999) p.505-512Article in journal (Refereed)
  • 2891.
    Zwahlen, Sebastian
    et al.
    Karlstad University, Faculty of Technology and Science.
    Andersson, Niclas
    Karlstad University, Faculty of Technology and Science.
    Tillfällig klädförvaring2010Independent thesis Basic level (degree of Bachelor), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [en]

    This degree project has been carried out by Niclas Andersson and Sebastian Zwahlen, students of the Innovation and Design Engineering Program at the Faculty of Technology and Science at Karlstad University. The project was carried out during the spring 2010 and includes 22, 5 ETCS credits.

    Initially the group had contact with the company Mavis möbler AB. Mavis gave the group the task of developing a new bedroom product. To assess the needs and problems of bedroom behaviors, an extensive questionnaire and several interviews were made. This became the starting point for further work.

    According to the results uncovered during the market research a vast problem was found with temporary clothing storage. As much as 68% of respondents store their clothes either on a chair, a couch, the bed or on the floor. The students saw this as a perfect opportunity to further investigate the options of temporary clothing storage (the students saw this as a bad alternative to storage).

    Detailed preliminary investigation of current solutions was made, where the students found that the valet stand was the best current alternative. To find a number of different solutions to this problem, several idea generating methods was used. Many of these ideas developed into concepts, which later in the process were evaluated using different technique. The final solution was developed through sketches, CAD models, drawings and prototypes.

    The prototypes were designed like a large hanger mounted on the wall. The final solution fulfilled all of the requirements set for temporary clothing storage.

    The final results were presented at the annual degree exhibition on May 26th 2010 at Karlstad University.

  • 2892.
    Åberg, Erik
    Karlstad University, Faculty of Technology and Science.
    Konstruktion av solcellsstativ i obehandlat naturmaterial2013Independent thesis Basic level (university diploma), 15 credits / 22,5 HE creditsStudent thesis
    Abstract [en]

    In this thesis an open field solar power mounting system in untreated wood is designed. A

    draft was available as basis for how the mounting system could be designed. This has been

    developed to a complete system adapted for manufacturing.

    The result is a wooden space grid structure made of angular half octahedrons in line. The

    wooden details are connected with joints in injection moulded plastics. The joints are

    designed to minimize machining to the wood and prevent decay.

    The system is verified by both calculation, simulation, and by finding similar structures.

    Material selection was made by methods according to Ashby, Material Selection in

    Mechanical Design. Blueprints for both manufacturing and assembly were developed. A

    comparison with other similar racking systems was also made.

    The conclusion of this thesis is that the developed mounting system would work in reality

    and should be further developed. This rack is better than all compared metal racks when

    environmental aspects are compared.

  • 2893.
    Åberg Eriksson, Johanna
    Karlstad University, Faculty of Technology and Science.
    Utveckling av ny produktfamilj med handskar för användare inom street- outdoor segmentet.: En liten bit av naturen till staden, en liten bit av staden till naturen2012Independent thesis Basic level (university diploma), 15 credits / 22,5 HE creditsStudent thesis
  • 2894.
    Åberg, Magnus
    et al.
    Karlstad University, Faculty of Arts and Education, Centrum för genusforskning.
    Mc Ewen, Birgitta
    Karlstad University, Faculty of Arts and Education, Centrum för genusforskning.
    Walan, Susanne
    Karlstad University, Faculty of Technology and Science.
    Boys, girls and the world of engineering: Gender issues in technology and technology education2010Conference paper (Other (popular science, discussion, etc.))
  • 2895. Ågren, G.I.
    et al.
    Wikström, Fredrik
    Karlstad University, Faculty of Technology and Science, Department of Energy, Environmental and Building Technology.
    Modelling carbon allocation - a review1993In: New Zealand Journal of Forestry Science 23(3): 343-353 (1993)Article in journal (Refereed)
  • 2896.
    Åhmark, Tony
    Karlstad University, Faculty of Technology and Science.
    Planering av området kartberget2009Student thesis
  • 2897.
    Åkefeldt, Jon
    Karlstad University, Faculty of Technology and Science, Department of Mechanical and Materials Engineering.
    Optimization of laser welding process: Hermetical weld between a medium carbon steel and a low carbon steel shim2017Independent thesis Advanced level (degree of Master (One Year)), 20 credits / 30 HE creditsStudent thesis
  • 2898.
    Åsberg, Dennis
    et al.
    Karlstad University, Faculty of Technology and Science, Department of Chemistry and Biomedical Sciences.
    Enmark, Martin
    Karlstad University, Faculty of Technology and Science, Department of Chemistry and Biomedical Sciences.
    Samuelsson, Jörgen
    Karlstad University, Faculty of Technology and Science, Department of Chemistry and Biomedical Sciences.
    Fornstedt, Torgny
    Karlstad University, Faculty of Technology and Science, Department of Chemistry and Biomedical Sciences.
    An Experimental and Theoretical investigation on Mobile PhaseEffects on Competitive Adsorption Isotherms in Preparative LC2012Conference paper (Refereed)
    Abstract [en]

    This poster serves as background information to the corresponding lecture. Mobile phase gradients have been used in LC since the 1950s and are still an important programming technique in both analytical and preparative LC. Improving the resolution, and thereby making the separation of complex samples possible, and reducing the separation time, which increases the productivity, are the two main advantages of gradient elution. The modelling of band profiles and the optimization of preparative separations has largely been studied under isocratic conditions. The shape of the gradient and the behaviour of the solutes are often determined experimentally with scarce knowledge about the underlying physicochemical equations. This "trial and error" approach results in time consuming and, possibly, expensive experiments. The goal of this work is to investigate the dependence of the adsorption behaviour on the mobile phase composition in reversed phase LC. By knowing the adsorption isotherm as a function of the concentrations of both the solute and the strong organic modifier, the band profiles are modelled under gradient elution conditions.Our aim is to make it possible to use modelling tools so one can optimize a separation and especially the gradient shape. Recent studies have shown that a significant improvement in productivity can be achieved if the gradient shapes are designed carefully [1,2].In this study we discuss how to obtain the adsorption isotherm data experimentally for two substances using the perturbation peak method. The substances which are investigated are cyclohexanone and cycloheptanone on a Kromasil C18-column with methanol-water as the mobile phase. The fitting of the nonlinear experimental data to appropriate theoretical isotherm models will also be discussed.For practical reasons, we will also be looking at how different key parameters, e.g. the column hold-up time, the column efficiency, the retention factor and the equilibrium constant, change with the mobile phase composition.With the experimentally determined adsorption isotherm as a basis, we will simulate overloaded band profiles under gradient elution conditions and compare the simulated results with experimentally obtained band profiles.A contribution from the Fundamental Separation Science Group www.separationscience.se

  • 2899.
    Ņsberg, Dennis
    et al.
    Karlstad University, Faculty of Technology and Science, Department of Chemistry and Biomedical Sciences.
    Enmark, Martin
    Karlstad University, Faculty of Technology and Science, Department of Chemistry and Biomedical Sciences.
    Samuelsson, Jörgen
    Karlstad University, Faculty of Technology and Science, Department of Chemistry and Biomedical Sciences.
    Fornstedt, Torgny
    Karlstad University, Faculty of Technology and Science, Department of Chemistry and Biomedical Sciences.
    Modelling of Overloaded Gradient Elution in Reversed-Phase Liquid Chromatography2012Conference paper (Refereed)
    Abstract [en]

    Mobile phase gradients have been used in LC since the 1950s and are still an important programming technique in both analytical and preparative LC. Improving the resolution, and thereby making the separation of complex samples possible - and thus reducing the separation time which increases the productivity- are the two main advantages of gradient elution. The modelling of band profiles and the optimization of preparative separations has largely been studied under isocratic conditions. The shape of the gradient and the behaviour of the solutes are often determined experimentally with scarce knowledge about the underlying physicochemical equations. This “trial and error” approach results in time consuming and, possibly, expensive experiments. The goal of this work is to investigate the dependence of the adsorption behaviour on the mobile phase composition in reversed phase LC. By knowing the adsorption isotherm as a function of the concentrations of both the solute and the strong organic modifier, the band profiles can be modelled under gradient elution conditions. Our aim is to make it possible to use modelling tools for a more reliable computer-assisted optimization, accounting for the gradient shape. Recent studies have shown that a significant improvement in productivity can be achieved if the gradient shapes are designed carefully [1,2]. In this presentation we will discuss how to obtain the adsorption isotherm data experimentally for two substances using the perturbation peak method. The substances investigated are cyclohexanone and cycloheptanone on a system comprising of a Kromasil C18-column and methanol-water as mobile phase. The fitting of the nonlinear experimental data to appropriate theoretical isotherm models will also be discussed. For practical reasons, we will also be looking at how different key parameters, e.g. the column hold-up time, the column efficiency, the retention factor and the equilibrium constant, change with the mobile phase composition. With the experimentally determined adsorption isotherm as a basis, we will simulate overloaded band profiles under gradient elution conditions and compare the simulated results with experimentally obtained band profiles. A contribution from the Fundamental Separation Science Group www.separationscience.se

  • 2900. Öhman, M.
    et al.
    Wan, H.
    Blomberg, Lars G
    Karlstad University, Faculty of Technology and Science, Department of Chemistry and Biomedical Sciences.
    Hamberg, M.
    Separation of Divinyl Ether Fatty Acid Isomers by Micellar Electrokinetic Chromatography,2001In: Electrophoresis, 22 (2001) 1163-1169Article in journal (Refereed)
5556575859 2851 - 2900 of 2918
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