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  • 1. Abramowski, A.
    et al.
    Acero, F.
    Aharonian, F.
    Akhperjanian, A. G.
    Anton, G.
    Balzer, A.
    Barnacka, A.
    Becherini, Yvonne
    Université Paris Diderot.
    Becker, J.
    Bernloehr, K.
    Birsin, E.
    Biteau, J.
    Bochow, A.
    Boisson, C.
    Bolmont, J.
    Bordas, P.
    Brucker, J.
    Brun, F.
    Brun, P.
    Bulik, T.
    Buesching, I.
    Carrigan, S.
    Casanova, S.
    Cerruti, M.
    Chadwick, P. M.
    Charbonnier, A.
    Chaves, R. C. G.
    Cheesebrough, A.
    Cologna, G.
    Conrad, J.
    Couturier, C.
    Dalton, M.
    Daniel, M. K.
    Davids, I. D.
    Degrange, B.
    Deil, C.
    Dickinson, H. J.
    Djannati-Atai, A.
    Domainko, W.
    Drury, L. O 'C.
    Dubus, G.
    Dutson, K.
    Dyks, J.
    Dyrda, M.
    Egberts, K.
    Eger, P.
    Espigat, P.
    Fallon, L.
    Fegan, S.
    Feinstein, F.
    Fernandes, M. V.
    Fiasson, A.
    Fontaine, G.
    Foerster, A.
    Fuessling, M.
    Gajdus, M.
    Gallant, Y. A.
    Garrigoux, T.
    Gast, H.
    Gerard, L.
    Giebels, B.
    Glicenstein, J. F.
    Glueck, B.
    Goering, D.
    Grondin, M. -H
    Haeffner, S.
    Hague, J. D.
    Hahn, J.
    Hampf, D.
    Harris, J.
    Hauser, M.
    Heinz, S.
    Heinzelmann, G.
    Henri, G.
    Hermann, G.
    Hillert, A.
    Hinton, J. A.
    Hofmann, W.
    Hofverberg, P.
    Holler, M.
    Horns, D.
    Jacholkowska, A.
    Jahn, C.
    Jamrozy, M.
    Jung, I.
    Kastendieck, M. A.
    Katarzynski, K.
    Katz, U.
    Kaufmann, S.
    Khelifi, B.
    Klochkov, D.
    Kluzniak, W.
    Kneiske, T.
    Komin, Nu
    Kosack, K.
    Kossakowski, R.
    Krayzel, F.
    Laffon, H.
    Lamanna, G.
    Lenain, J. -P
    Lennarz, D.
    Lohse, T.
    Lopatin, A.
    Lu, C. -C
    Marandon, V.
    Marcowith, A.
    Masbou, J.
    Maurin, G.
    Maxted, N.
    Mayer, M.
    McComb, T. J. L.
    Medina, M. C.
    Mehault, J.
    Moderski, R.
    Mohamed, M.
    Moulin, E.
    Naumann, C. L.
    Naumann-Godo, M.
    de Naurois, M.
    Nedbal, D.
    Nekrassov, D.
    Nguyen, N.
    Nicholas, B.
    Niemiec, J.
    Nolan, S. J.
    Ohm, S.
    Wilhelmi, E. de Ona
    Opitz, B.
    Ostrowski, M.
    Oya, I.
    Panter, M.
    Arribas, M. Paz
    Pekeur, N. W.
    Pelletier, G.
    Perez, J.
    Petrucci, P. -O
    Peyaud, B.
    Pita, S.
    Puehlhofer, G.
    Punch, Michael
    Univ Paris Diderot, APC, AstroParticule & Cosmology, CNRS,IN2P3,CEA,Irfu, Observ Paris,Sorbonne Paris C, 10 Rue Alice Domon & Leonie Duquet, F-75205 Paris 13, France.
    Quirrenbach, A.
    Raue, M.
    Reimer, A.
    Reimer, O.
    Renaud, M.
    de los Reyes, R.
    Rieger, F.
    Ripken, J.
    Rob, L.
    Rosier-Lees, S.
    Rowell, G.
    Rudak, B.
    Rulten, C. B.
    Sahakian, V.
    Sanchez, D. A.
    Santangelo, A.
    Schlickeiser, R.
    Schulz, A.
    Schwanke, U.
    Schwarzburg, S.
    Schwemmer, S.
    Sheidaei, F.
    Skilton, J. L.
    Sol, H.
    Spengler, G.
    Stawarz, L.
    Steenkamp, R.
    Stegmann, C.
    Stinzing, F.
    Stycz, K.
    Sushch, I.
    Szostek, A.
    Tavernet, J. -P
    Terrier, R.
    Tluczykont, M.
    Valerius, K.
    van Eldik, C.
    Vasileiadis, G.
    Venter, C.
    Viana, A.
    Vincent, P.
    Voelk, H. J.
    Volpe, F.
    Vorobiov, S.
    Vorster, M.
    Wagner, S. J.
    Ward, M.
    White, R.
    Wierzcholska, A.
    Zacharias, M.
    Zajczyk, A.
    Zdziarski, A. A.
    Zech, A.
    Zechlin, H. -S
    Spectral Analysis and Interpretation of the γ-ray Emission from the Starburst Galaxy NGC 2532012In: Astrophysical Journal, ISSN 0004-637X, E-ISSN 1538-4357, Vol. 757, no 2, p. 158-Article in journal (Refereed)
    Abstract [en]

    Very high energy (VHE; E >= 100 GeV) and high-energy (HE; 100 MeV <= E <= 100 GeV) data from gamma-ray observations performed with the H. E. S. S. telescope array and the Fermi-LAT instrument, respectively, are analyzed in order to investigate the non-thermal processes in the starburst galaxy NGC 253. The VHE gamma-ray data can be described by a power law in energy with differential photon index Gamma = 2.14 +/- 0.18(stat) +/- 0.30(sys) and differential flux normalization at 1 TeV of F-0 = (9.6 +/- 1.5(stat)(+5.7, -2.9)(sys)) x 10(-14) TeV-1 cm(-2) s(-1). A power-law fit to the differential HE gamma-ray spectrum reveals a photon index of Gamma = 2.24 +/- 0.14(stat) +/- 0.03(sys) and an integral flux between 200 MeV and 200 GeV of F(0.2-200 GeV) = (4.9 +/- 1.0(stat) +/- 0.3(sys)) x 10(-9) cm(-2) s(-1). No evidence for a spectral break or turnover is found over the dynamic range of both the LAT instrument and the H.E.S.S. experiment: a combined fit of a power law to the HE and VHE gamma-ray data results in a differential photon index Gamma = 2.34 +/- 0.03 with a p-value of 30%. The gamma-ray observations indicate that at least about 20% of the energy of the cosmic rays (CRs) capable of producing hadronic interactions is channeled into pion production. The smooth alignment between the spectra in the HE and VHE gamma-ray domain suggests that the same transport processes dominate in the entire energy range. Advection is most likely responsible for charged particle removal from the starburst nucleus from GeV to multiple TeV energies. In a hadronic scenario for the gamma-ray production, the single overall power-law spectrum observed would therefore correspond to the mean energy spectrum produced by the ensemble of CR sources in the starburst region.

  • 2.
    Adenier, Guillaume
    et al.
    Växjö University, Faculty of Mathematics/Science/Technology, School of Mathematics and Systems Engineering. Mathematics.
    Khrennikov, Andrei
    Växjö University, Faculty of Mathematics/Science/Technology, School of Mathematics and Systems Engineering. Mathematics.
    Is the fair sampling assumption supported by EPR experiments?2007In: Journal of Physics B: At. Mol. Opt. Phys., ISSN 0953-4075, Vol. 40, no 1, p. 131-141Article in journal (Refereed)
    Abstract [en]

    We analyse optical EPR experimental data performed by Weihs et al in Innsbruck 1997–1998. We show that for some linear combinations of the raw coincidence rates, the experimental results display some anomalous behaviour that a more general source state (like non-maximally entangled state) cannot straightforwardly account for. We attempt to explain these anomalies by taking account of the relative efficiencies of the four channels. For this purpose, we use the fair sampling assumption, and assume explicitly that the detection efficiencies for the pairs of entangled photons can be written as a product of the two corresponding detection efficiencies for the single photons. We show that this explicit use of fair sampling cannot be maintained to be a reasonable assumption as it leads to an apparent violation of the no-signalling principle.

  • 3.
    Airey, John
    et al.
    Linnaeus University, Faculty of Arts and Humanities, Department of Languages. Uppsala University.
    Linder, Cedric
    Uppsala University.
    Social semiotics in university physics education: Leveraging critical constellations of disciplinary representations2015In: Science Education Research: Engaging learners for a sustainable future / [ed] Jari Lavonen, Kalle Juuti, Jarkko Lampiselkä, Anna Uitto, Kaisa Hahl, European Science Education Research Association , 2015Conference paper (Refereed)
    Abstract [en]

    Social semiotics is a broad construct where all communication is viewed as being realized through signs and their signification. In physics education we usually refer to these signs as disciplinary representations. These disciplinary representations are the semiotic resources used in physics communication, such as written and oral languages, diagrams, graphs, mathematics, apparatus and simulations. This alternative depiction of representations is used to build theory with respect to the construction and sharing of disciplinary knowledge in the teaching and learning of university physics. Based on empirical studies of physics students cooperating to explain the refraction of light, a number of theoretical constructs were developed. In this presentation we describe these constructs and examine their usefulness for problematizing teaching and learning in university physics. The theoretical constructs are: fluency in semiotic resources, disciplinary affordance and critical constellations.

    The conclusion formulates a proposal that has these constructs provide university physics teachers with a new set of meaningfully and practical tools, which will enable them to re-conceptualize their practice in ways that have the distinct potential to optimally enhance student learning.

  • 4. Ambrosio, M
    et al.
    Antolini, R
    Assiro, R
    Auriemma, G
    Bakari, D
    Baldini, A
    Barbarino, G C
    Barbarito, E
    Barish, B C
    Battistoni, G
    Becherini, Yvonne
    Università di Bologna.
    Bellotti, R
    Bemporad, C
    Bernardini, P
    Bilokon, H
    Bisi, V
    Bloise, C
    Bottazzi, E
    Bower, C
    Brigida, M
    Bussino, S
    Cafagna, F
    Calicchio, M
    Campana, D
    Candela, A
    Carboni, M
    Cecchini, S
    Cei, F
    Ceres, A
    Chiarella, V
    Choudhary, B C
    Coutu, S
    Cozzi, M
    Creti, P
    De Cataldo, G
    Degli Esposti, L
    Dekhissi, H
    De Marzo, C
    De Mitri, I
    Derkaoui, J
    De Vincenzi, M
    Di Credico, A
    Di Ferdinando, D
    Diotallevi, R
    Erriquez, O
    Favuzzi, C
    Forti, C
    Fusco, P
    Gebhard, M
    Giacomelli, G
    Giacomelli, R
    Giannini, G
    Giglietto, N
    Giorgini, M
    Giuliani, R
    Goretti, M
    Grassi, M
    Grau, H
    Gray, L
    Grillo, A
    Guarino, F
    Gustavino, C
    Habig, A
    Hanson, J
    Hanson, K
    Hawthorne, A
    Heinz, R
    Hong, J T
    Iarocci, E
    Katsavounidis, E
    Katsavounidis, I
    Kearns, E
    Kim, H
    Kyriazopoulou, S
    Lamanna, E
    Lane, C
    Leone, A
    Levin, D S
    Lipari, P
    Liu, G
    Liu, R
    Longley, N P
    Longo, M J
    Loparco, F
    Maaroufi, F
    Mancarella, G
    Mandrioli, G
    Manzoor, S
    Marrelli, V
    Margiotta, A
    Marini, A
    Martello, D
    Marzari-Chiesa, A
    Mazziotta, M N
    Michael, D G
    Mikheyev, S
    Miller, L
    Monacelli, P
    Mongelli, M
    Montaruli, T
    Monteno, M
    Mossbarger, L
    Mufson, S
    Musser, J
    Nicolo, D
    Nolty, R
    Okada, C
    Orsini, M
    Orth, C
    Osteria, G
    Ouchrif, M
    Palamara, O
    Parlati, S
    Patera, V
    Patrizii, L
    Pazzi, R
    Peck, C W
    Pellizzoni, G
    Perchiazzi, M
    Perrone, L
    Petrakis, J
    Petrera, S
    Pignatano, N
    Pinto, C
    Pistilli, P
    Popa, V
    Raino, A
    Reynoldson, J
    Ronga, F
    Rrhioua, A
    Sacchetti, A
    Saggese, P
    Satriano, C
    Satta, L
    Scapparone, E
    Scholberg, K
    Sciubba, A
    Serra, P
    Sioli, M
    Sirri, G
    Sitta, M
    Sondergaard, S
    Spinelli, P
    Spinetti, M
    Spurio, M
    Stalio, S
    Steinberg, R
    Stone, J L
    Sulak, L R
    Surdo, A
    Tarle, G
    Togo, V
    Vakili, M
    Valieri, C
    Walter, C W
    Webb, R
    Zaccheo, N
    The MACRO detector at Gran Sasso2002In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, ISSN 0168-9002, E-ISSN 1872-9576, Vol. 486, no 3, p. 663-707Article in journal (Refereed)
    Abstract [en]

    MACRO was an experiment that ran in the Laboratori Nazionali del Gran Sasso from 1988 to 2000. Its principal goal was to observe magnetic monopoles or set significantly lower experimental flux limits than had been previously available in the velocity range from about beta = 10(-4) to unity. In addition it made a variety of other observations. Examples are: setting flux limits on other so far unobserved particles such as nuclearites and lightly ionizing particles, searching for WIMP annihilations in the Earth and the Sun and for neutrino bursts from stellar collapses in or near our Galaxy, and making measurements relevant to high energy muon and neutrino astronomy and of the flux of up-going muons as a function of nadir angle showing evidence for neutrino oscillations. The apparatus consisted of three principal types of detectors: liquid scintillator counters, limited streamer tubes, and nuclear track etch detectors. In addition, over part of its area it contained a transition radiation detector. The general design philosophy emphasized redundancy and complementarity. This paper describes the technical aspects of the complete MACRO detector, its operational performance, and the techniques used to calibrate it and verify its proper operation. It supplements a previously published paper which described the first portion of the detector that was built and operated. (C) 2002 Elsevier Science B.V. All rights reserved.

  • 5. Ambrosio, M
    et al.
    Antolini, R
    Auriemma, G
    Bakari, D
    Baldini, A
    Barbarino, G C
    Barish, B C
    Battistoni, G
    Becherini, Yvonne
    Università di Bologna .
    Bellotti, R
    Bemporad, C
    Bernardini, P
    Bilokon, H
    Bisi, V
    Bloise, C
    Bower, C
    Brigida, M
    Bussino, S
    Cafagna, F
    Calicchio, M
    Campana, D
    Carboni, M
    Caruso, R
    Cecchini, S
    Cei, F
    Chiarella, V
    Choudhary, B C
    Coutu, S
    De Cataldo, G
    Dekhissi, H
    De Marzo, C
    De Mitri, I
    Derkaoui, J
    De Vincenzi, M
    Di Credico, A
    Erriquez, O
    Favuzzi, C
    Forti, C
    Fusco, P
    Giacomelli, G
    Giannini, G
    Giglietto, N
    Giorgini, M
    Grassi, M
    Gray, L
    Grillo, A
    Guarino, F
    Gustavino, C
    Habig, A
    Hanson, K
    Heinz, R
    Iarocci, E
    Katsavounidis, E
    Katsavounidis, I
    Kearns, E
    Kim, H
    Kyriazopoulou, S
    Lamanna, E
    Lane, C
    Levin, D S
    Lipari, P
    Longley, N P
    Longo, M J
    Loparco, F
    Maaroufi, F
    Mancarella, G
    Mandrioli, G
    Margiotta, A
    Marini, A
    Martello, D
    Marzari-Chiesa, A
    Mazziotta, M N
    Michael, D G
    Mikheyev, S
    Miller, L
    Monacelli, P
    Montaruli, T
    Monteno, M
    Mufson, S
    Musser, J
    Nicolo, D
    Nolty, R
    Orth, C
    Osteria, G
    Palamara, O
    Patera, V
    Patrizii, L
    Pazzi, R
    Peck, C W
    Perrone, L
    Petrera, S
    Pistilli, P
    Popa, V
    Raino, A
    Reynoldson, J
    Ronga, F
    Rrhioua, A
    Satriano, C
    Scapparone, E
    Scholberg, K
    Sciubba, A
    Serra, P
    Sioli, M
    Sirri, G
    Sitta, M
    Spinelli, P
    Spinetti, M
    Spurio, M
    Steinberg, R
    Stone, J L
    Sulak, L R
    Surdo, A
    Tarle, G
    Togo, V
    Vakili, M
    Walter, C W
    Webb, R
    Matter effects in upward-going muons and sterile neutrino oscillations2001In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 517, no 1-2, p. 59-66Article in journal (Refereed)
    Abstract [en]

    The angular distribution of upward-going muons produced by atmospheric neutrinos in the rock below the MACRO detector shows anomalies in good agreement with two flavor nu (mu) --> nu (tau) oscillations with maximum mixing and Deltam(2) around 0.0024 eV(2). Exploiting the dependence of magnitude of the matter effect on oscillation channel, and using a set of 809 upward-going muons observed in MACRO, we show that the two flavor nu (mu) --> nu (s) oscillation is disfavored with 99% C.L. with respect to nu (mu) --> nu (tau). (C) 2001 Elsevier Science B.V. All rights reserved.

  • 6. Ambrosio, M
    et al.
    Antolini, R
    Auriemma, G
    Bakari, D
    Baldini, A
    Barbarino, G C
    Barish, B C
    Battistoni, G
    Becherini, Yvonne
    Università di Bologna .
    Bellotti, R
    Bemporad, C
    Bernardini, P
    Bilokon, H
    Bloise, C
    Bower, C
    Brigida, M
    Bussino, S
    Cafagna, F
    Calicchio, M
    Campana, D
    Candela, A
    Carboni, M
    Caruso, R
    Cassese, F
    Cecchini, S
    Cei, F
    Chiarella, V
    Choudhary, B C
    Coutu, S
    Cozzi, M
    De Cataldo, G
    De Deo, M
    Dekhissi, H
    De Marzo, C
    De Mitri, I
    Derkaoui, J
    De Vincenzi, M
    Di Credico, A
    Dincecco, M
    Erriquez, O
    Favuzzi, C
    Forti, C
    Fusco, P
    Giacomelli, G
    Giannini, G
    Giglietto, N
    Giorgini, M
    Grassi, M
    Gray, L
    Grillo, A
    Guarino, F
    Gustavino, C
    Habig, A
    Hanson, K
    Heinz, R
    Iarocci, E
    Katsavounidis, E
    Katsavounidis, I
    Kearns, E
    Kim, H
    Kyriazopoulou, S
    Lamanna, E
    Lane, C P
    Levin, D S
    Lindozzi, M
    Lipari, P
    Longley, N P
    Longo, M J
    Loparco, F
    Marroufi, F
    Mancarella, G
    Mandrioli, G
    Margiotta, A
    Marini, A
    Martello, D
    Marzari-Chiesa, A
    Mazziotta, M N
    Michael, D G
    Monacelli, P
    Montaruli, T
    Monteno, M
    Mufson, S
    Musser, J
    Nicolo, D
    Nolty, R
    Orth, C
    Osteria, G
    Palamara, O
    Patera, V
    Patrizii, L
    Pazzi, R
    Peck, C W
    Perrone, L
    Petrera, S
    Pistilli, P
    Popa, V
    Raino, A
    Reynoldson, J
    Ronga, F
    Rrhioua, A
    Satriano, C
    Scapparone, E
    Scholberg, K
    Sciubba, A
    Serra, P
    Sioli, M
    Sirri, G
    Sitta, M
    Spinelli, P
    Spinetti, M
    Spurio, M
    Steinberg, R
    Stone, J L
    Sulak, L R
    Surdo, A
    Tarle, G
    Tatananni, E
    Togo, V
    Vakili, M
    Walter, C W
    Webb, R
    Muon energy estimate through multiple scattering with the MACRO detector2002In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, ISSN 0168-9002, E-ISSN 1872-9576, Vol. 492, no 3, p. 376-386Article in journal (Refereed)
    Abstract [en]

    Muon energy measurement represents an important issue for any experiment addressing neutrino-induced up-going muon studies. Since the neutrino oscillation probability depends on the neutrino energy, a measurement of the muon energy adds an important piece of information concerning the neutrino system. We show in this paper how the MACRO limited streamer tube system can be operated in drift mode by using the TDCs included in the QTPs, an electronics designed for magnetic monopole search. An improvement of the space resolution is obtained, through an analysis of the multiple scattering of muon tracks as they pass through our detector. This information can be used further to obtain an estimate of the energy of muons crossing the detector. Here we present the results of two dedicated tests, performed at CERN PS-T9 and SPS-X7 beam lines, to provide a full check of the electronics and to exploit the feasibility of such a multiple scattering analysis. We show that by using a neural network approach, we are able to reconstruct the muon energy for E-mu < 40 GeV. The test beam data provide an absolute energy calibration, which allows us to apply this method to MACRO data. (C) 2002 Elsevier Science B.V. All rights reserved.

  • 7. Ambrosio, M
    et al.
    Antolini, R
    Bakari, D
    Baldini, A
    Barbarino, G C
    Barish, B C
    Battistoni, G
    Becherini, Yvonne
    Università di Bologna.
    Bellotti, R
    Bemporad, C
    Bernardini, P
    Bilokon, H
    Bloise, C
    Bower, C
    Brigida, M
    Bussino, S
    Cafagna, E
    Calicchio, M
    Campana, D
    Carboni, M
    Caruso, R
    Cecchini, S
    Cei, F
    Chiarella, V
    Chiarusi, T
    Choudhary, B C
    Coutu, S
    Cozzi, M
    De Cataldo, G
    Dekhissi, H
    De Marzo, C
    De Mitri, I
    Derkaoui, J
    De Vincenzi, M
    Di Credico, A
    Favuzzi, C
    Forti, C
    Fusco, P
    Giacomelli, G
    Giannini, G
    Giglietto, N
    Giorgini, M
    Grassi, M
    Grillo, A
    Gustavino, C
    Habig, A
    Hanson, K
    Heinz, R
    Iarocci, E
    Katsavounidis, E
    Katsavounidis, I
    Kearns, E
    Kim, H
    Kumar, A
    Kyriazopoulou, S
    Lamanna, E
    Lane, C
    Levin, D S
    Lipari, P
    Longo, M J
    Loparco, F
    Maaroufi, F
    Mancarella, G
    Mandrioli, G
    Manzoor, S
    Margiotta, A
    Marini, A
    Martello, D
    Marzari-Chiesa, A
    Mazziotta, M N
    Michael, D G
    Mikheyev, S
    Monacelli, P
    Montaruli, T
    Monteno, M
    Mufson, S
    Musser, J
    Nicolo, D
    Nolty, R
    Orth, C
    Osteria, G
    Palamara, O
    Patera, V
    Patrizii, L
    Pazzi, R
    Peck, C W
    Perrone, L
    Petrera, S
    Popa, V
    Raino, A
    Reynoldson, J
    Ronga, F
    Rrhioua, A
    Satriano, C
    Scapparone, E
    Scholberg, K
    Sciubba, A
    Serra, P
    Sioli, M
    Sirri, G
    Sitta, M
    Spinelli, P
    Spinetti, M
    Spurio, M
    Steinberg, R
    Stone, J L
    Sulak, L R
    Surdo, A
    Tarle, G
    Togo, V
    Vakili, M
    Walter, C W
    Webb, R
    Atmospheric neutrino oscillations from upward throughgoing muon multiple scattering in MACRO2003In: Physics Letters B, ISSN 0370-2693, E-ISSN 1873-2445, Vol. 566, no 1-2, p. 35-44Article in journal (Refereed)
    Abstract [en]

    The energy of atmospheric neutrinos detected by MACRO was estimated using multiple Coulomb scattering of upward throughgoing muons. This analysis allows a test of atmospheric neutrino oscillations, relying on the distortion of the muon energy distribution. These results have been combined with those coming from the upward throughgoing muon angular distribution only. Both analyses are independent of the neutrino flux normalization and provide strong evidence, above the for level, in favour of neutrino oscillations. (C) 2003 Published by Elsevier B.V.

  • 8. Ambrosio, M
    et al.
    Antolini, R
    Bakari, D
    Baldini, A
    Barbarino, G C
    Barish, B C
    Battistoni, G
    Becherini, Yvonne
    Università di Bologna.
    Bellotti, R
    Bemporad, C
    Bernardini, P
    Bilokon, H
    Bloise, C
    Bower, C
    Brigida, M
    Cafagna, F
    Campana, D
    Carboni, M
    Cecchini, S
    Cei, F
    Chiarella, V
    Choudhary, B C
    Cosson, D
    Coutu, S
    De Cataldo, G
    Dekhissi, H
    De Marzo, C
    De Mitri, I
    Denni, U
    Derkauoi, J
    De Vincenzi, M
    Di Credico, A
    Favuzzi, C
    Forti, C
    Frani, A
    Fusco, P
    Giacomelli, G
    Giannini, G
    Giglietto, N
    Giorgini, M
    Grassi, M
    Grillo, A
    Guarino, F
    Gustavino, C
    Habig, A
    Hanson, K
    Heinz, R
    Iarocci, E
    Katsavounidis, E
    Katsavounidis, I
    Kearns, E
    Kim, H
    Kyriazopoulou, S
    Lamanna, E
    Lane, C
    Levin, D S
    Lipari, P
    Longo, M J
    Loparco, F
    Maaroufi, F
    Mancarella, G
    Mandrioli, G
    Manzoor, S
    Margiotta, A
    Marini, A
    Martello, D
    Marzari-Chiesa, A
    Mazziotta, M N
    Mengucci, A
    Michael, D G
    Mikheyev, S
    Monacelli, P
    Montaruli, T
    Monteno, M
    Mufson, S
    Musser, J
    Nicolo, D
    Nolty, R
    Orth, C
    Osteria, G
    Palamara, O
    Patera, V
    Patrizii, L
    Pazzi, R
    Peck, C W
    Perrone, L
    Petrera, S
    Popa, V
    Raino, A
    Reynoldson, J
    Ronga, F
    Satriano, C
    Scholberg, K
    Sciubba, A
    Sioli, M
    Sitta, M
    Spinelli, P
    Spinetti, M
    Spurio, M
    Steinberg, R
    Stone, J L
    Sulak, L R
    Surdo, A
    Tarle, G
    Togo, V
    Vakili, M
    Walter, C W
    Webb, R
    Measurements of atmospheric muon neutrino oscillations, global analysis of the data collected with MACRO detector2004In: European Physical Journal C, ISSN 1434-6044, E-ISSN 1434-6052, Vol. 36, no 3, p. 323-339Article in journal (Refereed)
    Abstract [en]

    The final analysis of atmospheric neutrino events collected with the MACRO detector is presented. Three different classes of events, generated by neutrinos in different energy ranges, are studied looking at rates, angular distributions and estimated energies. The results are consistent for all the subsamples and indicate a flux deficit that depends on energy and path - length of neutrinos. The no - oscillation hypothesis is excluded at similar to 5sigma, while the hypothesis of nu(mu) --> nu(tau) oscillation gives a satisfactory description of all data. The parameters with highest probability in a two flavor scenario are sin(2) 2theta(m) = 1 and Deltam(2) = 0.0023 eV(2). This result is independent of the absolute normalization of the atmospheric neutrino fluxes. The data can also be used to put experimental constrain on this normalization.

  • 9.
    Andersson, Anders
    Växjö University, Faculty of Mathematics/Science/Technology, School of Mathematics and Systems Engineering. Matematik.
    Using a Zipper Algorithm to find a Conformal Map for a Channel with Smooth Boundary2006In: AIP Conference Proceedings: Second Conference on Mathematical Modeling of Wave Phenomena, American Institute of Physics, New York , 2006, p. 378-Conference paper (Refereed)
    Abstract [en]

    The so called geodesic algorithm, which is one of the zipper algorithms for conformal mappings, is combined with a Schwarz–Christoffel mapping, in its original or in a modified form, to produce a conformal mapping function between the upper half-plane and an arbitrary channel with smooth boundary and parallel walls at the end.

  • 10.
    Andersson, Anders
    et al.
    Växjö University, Faculty of Mathematics/Science/Technology, School of Mathematics and Systems Engineering.
    Nilsson, Börje
    Växjö University, Faculty of Mathematics/Science/Technology, School of Mathematics and Systems Engineering.
    Acoustic Transmission in Ducts of Various Shapes with an Impedance Condition2008In: International Conference on Numerical Analysis and Applied Mathematics 2008, AIP, Melville, USA , 2008, p. 33-36Conference paper (Refereed)
    Abstract [en]

    Propagation of acoustic waves in a two-dimensional duct with an impedance condition at the boundary, is studied. The duct is assumed to have two ends at infinity being asymptotically straight, but otherwise to be arbitrarily shaped.The so called Building Block Method allows us to synthesize propagation properties for ducts with complicated geometries from results for simpler ducts. Conformal mappings can be used to transform these simple ducts to straight ducts with constant cross-sections.By using recently developed techniques for numerical conformal mappings, it is possible to construct a transformation between an infinite strip and an arbitrarily shaped duct with smooth or piecewise smooth boundary, keeping both smoothness and the well controlled boundary direction towards infinity that the above mentioned method requires.To accomplish a stable formulation of the problem, we express it in terms of scattering operators. The resulting differential equation is solved using wave splitting and invariant embedding techniques. We expand the involved functions in Fourier series, and hence, it is possible to give the operators a matrix representation. Numerical results are produced using truncated matrices.

  • 11.
    Aref’eva, I. Ya.
    et al.
    Russian Academy of Sciences, Russia.
    Djordjevic, G. S.
    University of Niš, Serbia.
    Khrennikov, Andrei
    Linnaeus University, Faculty of Technology, Department of Mathematics.
    Kozyrev, S. V.
    Russian Academy of Sciences, Russia.
    Rakic, Z.
    University of Belgrade, Serbia.
    Volovich, I. V.
    Russian Academy of Sciences, Russia.
    p-Adic mathematical physics and B. Dragovich research2017In: P-Adic Numbers, Ultrametric Analysis, and Applications, ISSN 2070-0466, E-ISSN 2070-0474, Vol. 9, no 1, p. 82-85Article in journal (Refereed)
    Abstract [en]

    We present a brief review of some parts of p-adic mathematical physics related to the scientific work of Branko Dragovich on the occasion of his 70th birthday.

  • 12. Asano, Masanari
    et al.
    Basieva, Irina
    Khrennikov, Andrei
    Linnaeus University, Faculty of Technology, Department of Mathematics.
    Ohya, Masanori
    Tanaka, Yoshiharu
    Yamato, Ichiro
    Quantum Information Biology2016In: Contextuality from Quantum Physics to Psychology / [ed] Ehtibar Dzhafarov, Scott Jordan, Ru Zhang, Victor Cervantes, World Scientific, 2016, p. 399-413Chapter in book (Refereed)
  • 13.
    Azimi Mousolou, Vahid
    Linnaeus University, Faculty of Technology, Department of Physics and Electrical Engineering.
    Quantum Holonomy for Many-Body Systems and Quantum Computation2013Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    The research of this Ph. D. thesis is in the field of Quantum Computation and Quantum

    Information. A key problem in this field is the fragile nature of quantum states. This

    becomes increasingly acute when the number of quantum bits (qubits) grows in order to

    perform large quantum computations. It has been proposed that geometric (Berry) phases

    may be a useful tool to overcome this problem, because of the inherent robustness of such

    phases to random noise. In the thesis we investigate geometric phases and quantum

    holonomies (matrix-valued geometric phases) in many-body quantum systems, and elucidate

    the relationship between these phases and the quantum correlations present in the systems.

    An overall goal of the project is to assess the feasibility of using geometric phases and

    quantum holonomies to build robust quantum gates, and investigate their behavior when the

    size of a quantum system grows, thereby gaining insights into large-scale quantum

    computation.

    In a first project we study the Uhlmann holonomy of quantum states for hydrogen-like

    atoms. We try to get into a physical interpretation of this geometric concept by analyzing its

    relation with quantum correlations in the system, as well as by comparing it with different

    types of geometric phases such as the standard pure state geometric phase, Wilczek-Zee

    holonomy, Lévay geometric phase and mixed-state geometric phases. In a second project we

    establish a unifying connection between the geometric phase and the geometric measure of

    entanglement in a generic many-body system, which provides a universal approach to the

    study of quantum critical phenomena. This approach can be tested experimentally in an

    interferometry setup, where the geometric measure of entanglement yields the visibility of

    the interference fringes, whereas the geometric phase describes the phase shifts. In a third

    project we propose a scheme to implement universal non-adiabatic holonomic quantum

    gates, which can be realized in novel nano-engineered systems such as quantum dots,

    molecular magnets, optical lattices and topological insulators. In a fourth project we propose

    an experimentally feasible approach based on “orange slice” shaped paths to realize non-

    Abelian geometric phases, which can be used particularly for geometric manipulation of

    qubits. Finally, we provide a physical setting for realizing non-Abelian off-diagonal

    geometric phases. The proposed setting can be implemented in a cyclic chain of four qubits

    with controllable nearest-neighbor interactions. Our proposal seems to be within reach in

    various nano-engineered systems and therefore opens up for first experimental test of the

    non-Abelian off-diagonal geometric phase.

  • 14.
    Azimi Mousolou, Vahid
    et al.
    University of Isfahan, Iran.
    Canali, Carlo M.
    Linnaeus University, Faculty of Technology, Department of Physics and Electrical Engineering.
    Sjöqvist, Erik
    Uppsala University.
    Spin-electric Berry phase shift in triangular molecular magnets2016In: Physical Review B, ISSN 2469-9950, E-ISSN 2469-9969, Vol. 94, no 23, article id 235423Article in journal (Refereed)
    Abstract [en]

    We propose a Berry phase effect on the chiral degrees of freedom of a triangular magnetic molecule. The phase is induced by adiabatically varying an external electric field in the plane of the molecule via a spin-electric coupling mechanism present in these frustrated magnetic molecules. The Berry phase effect depends on spin-orbit interaction splitting and on the electric dipole moment. By varying the amplitude of the applied electric field, the Berry phase difference between the two spin states can take any arbitrary value between zero and π, which can be measured as a phase shift between the two chiral states by using spin-echo techniques. Our result can be used to realize an electric-field-induced geometric phase-shift gate acting on a chiral qubit encoded in the ground-state manifold of the triangular magnetic molecule.

  • 15. Bakari, D
    et al.
    Becherini, Yvonne
    Spurio, M
    Estimate of the energy of upgoing muons with multiple coulomb scattering2001In: Cosmic Radiations: from Astronomy to Particle Physics / [ed] Giacommelli, G; Spurio, M; Derkaoui, JE, Dordrecht: Springer, 2001, Vol. 42, p. 135-140Conference paper (Other academic)
  • 16.
    Becherini, Yvonne
    University of Bologna .
    MACRO results on atmospheric neutrino oscillations2003In: Neutrino Physics / [ed] Bellotti, E; Declais, Y; Strolin, P; Zanotti, L, Amsterdam: IOS Press, 2003, Vol. 152, p. 269-273Conference paper (Other academic)
  • 17. Becherini, Yvonne
    et al.
    Margiotta, A
    Sioli, M
    Spurio, M
    A parameterisation of single and multiple muons in the deep water or ice2006In: Astroparticle physics, ISSN 0927-6505, E-ISSN 1873-2852, Vol. 25, no 1, p. 1-13Article in journal (Refereed)
    Abstract [en]

    Atmospheric muons play an important role in underwater/ice neutrino detectors. In this paper, a parameterisation of the flux of single and multiple muon events, their lateral distribution and of their energy spectrum is presented. The kinematics parameters were modelled starting from a full Monte Carlo simulation of the interaction of primary cosmic rays with atmospheric nuclei; secondary muons reaching the sea level were propagated in the deep water. The parametric formulas are valid for a vertical depth of 1.5-5 km.w.e. and lip to 85 degrees for the zenith angle, and can be used as input for a fast simulation of atmospheric muons in underwater/ice detectors. (c) 2005 Elsevier B.V. All rights reserved.

  • 18. Boij, Susann
    et al.
    Nilsson, Börje
    Växjö University, Faculty of Mathematics/Science/Technology, School of Mathematics and Systems Engineering. matematik.
    Scattering properties of an orifice in a flow duct: simulations with a vortex sheet model.2008In: 14th AIAA/CEAS Aeroacoustics Conference, Vancouver 5-7 May 2008, American Institute of Aeronautics and Astronautics (AIAA), Reston, VA , USA , 2008Conference paper (Other academic)
    Abstract [en]

    The acoustic properties of an in-duct orifice are modeled with a vortex sheet model. Building block elements are used to construct a single slit in a two dimensional model of a flow duct. The foundation of this analytical model is the scattering properties of a trailing and leading edge, semi infinite splitter plate in an infinite duct. From the achieved model of the single slit, mode complex element can be constructed, such as periodically spaced orifices.

  • 19.
    Elustondo, Diego
    et al.
    Luleå University of Technology.
    Ahmed, Sheikh Ali
    Luleå University of Technology.
    Oliveira, Luiz
    FPInnovations, Canada.
    Drying western red cedar with superheated steam2014In: Drying Technology, ISSN 0737-3937, E-ISSN 1532-2300, Vol. 32, no 5, p. 550-556Article in journal (Refereed)
    Abstract [en]

    This exploratory study evaluated the possibility of drying 50-mm-thick western red cedar with superheated steam. Since there are no industrial facilities in Canada drying western red cedar with superheated steam, the study was designed to explore the potential of this technology in terms of lumber quality, moisture content distribution, and drying time. The experiments showed that the 50-mm-thick product can be dried in less than three days without jeopardizing lumber quality (in comparison with the two weeks that is currently required in conventional kilns), and the percentage of pieces that remained wet after drying was within the 10% to 15% range that is typically tolerated in industry.

  • 20.
    Enghag, Margaret
    et al.
    Uppsala universitet, Fysikundervisningens didaktik.
    Forsman, Jonas
    Uppsala universitet, Fysikundervisningens didaktik.
    Moons, Ellen
    Linder, Cedric
    Uppsala universitet, Fysikundervisningens didaktik.
    Andersson, Staffan
    Uppsala universitet, Fysikundervisningens didaktik.
    Wikman, Susanne
    University of Kalmar, School of Pure and Applied Natural Sciences.
    Students self-evaluations of themselves as disciplinary practitioners2009In: Paper presented at the GIREP-EPEC (International Research Group on Physics Teaching) Conference, University of Leicester, Great Britain, 17-21 August, 2009Conference paper (Refereed)
  • 21.
    Fredlund, Tobias
    et al.
    Uppsala Univ, Sweden.
    Airey, John
    Linnaeus University, Faculty of Arts and Humanities, Department of Languages. Uppsala Univ, Sweden.
    Linder, Cedric
    Uppsala Univ, Sweden ; Univ Western Cape, South Africa.
    Enhancing the possibilities for learning: variation of disciplinary-relevant aspects in physics representations2015In: European journal of physics, ISSN 0143-0807, E-ISSN 1361-6404, Vol. 36, no 5, article id 055001Article in journal (Refereed)
    Abstract [en]

    In this theoretical article we propose three factors that can enhance the possibilities for learning physics from representations, namely: (1) the identification of disciplinary-relevant aspects for a particular disciplinary task, such as solving a physics problem or explaining a phenomenon, (2) the selection of appropriate representations that showcase these disciplinary-relevant aspects, and (3) the creation of variation within the selected representations to help students notice these disciplinary-relevant aspects and the ways in which they are related to each other. An illustration of how these three factors can guide teachers in their efforts to promote physics learning is presented.

  • 22. Fredlund, Tobias
    et al.
    Airey, John
    Linnaeus University, Faculty of Humanities and Social Sciences, School of Language and Literature.
    Linder, Cedric
    Uppsala University.
    Exploring the role of physics representations: an illustrative example from students sharing knowledge about refraction2012In: European journal of physics, ISSN 0143-0807, E-ISSN 1361-6404, Vol. 33, p. 657-666Article in journal (Refereed)
    Abstract [en]

    Research has shown that interactive engagement enhances student learning outcomes. A growing body of research suggests that the representations we use in physics are important in such learning environments. In this paper we draw on a number of sources in the literature to explore the role of representations in interactive engagement in physics. In particular we are interested in the potential for sharing disciplinary knowledge inherent in so-called persistent representations (such as equations, diagrams and graphs), which we use in physics.

    We use selected extracts from a case study, where a group of senior undergraduate physics students are asked to explain the phenomenon of refraction, to illustrate implications for interactive engagement. In this study the ray diagram that was initially introduced by the students did not appear to sufficiently support their interactive engagement. However, the introduction of a wavefront diagram quickly led their discussion to an agreed conclusion. 

    From our analysis we conclude that in interactive engagement it is important to choose appropriate persistent representations to coordinate the use of other representations such as speech and gestures. Pedagogical implications and future research are proposed. 

  • 23.
    Fredlund, Tobias
    et al.
    Uppsala University.
    Linder, Cedric
    Uppsala University;University of the Western Cape, South Africa).
    Airey, John
    Linnaeus University, Faculty of Arts and Humanities, Department of Languages. Uppsala University.
    A social semiotic approach to identifying critical aspects2015In: International Journal for Lesson and Learning Studies, ISSN 2046-8253, E-ISSN 2046-8261, Vol. 4, no 3, p. 302-316Article in journal (Refereed)
    Abstract [en]

    The purpose of this paper is to propose a social semiotic approach to analysing objects of learning in terms of their critical aspects. Design/methodology/approach – The design for this paper focuses on how the semiotic resources – including language, equations, and diagrams – that are commonly used in physics teaching realise the critical aspects of a common physics object of learning. A social semiotic approach to the analysis of a canonical text extract from optics is presented to illustrate how critical aspects can be identified. Findings – Implications for university teaching and learning of physics stemming from this social semiotic approach are suggested.

    Originality/value – Hitherto under-explored similarities between the Variation Theory of Learning, which underpins learning studies, and a social semiotic approach to meaning-making are identified. These similarities are used to propose a new, potentially very powerful approach to identifying critical aspects of objects of learning. 

  • 24.
    Galeano, Victor
    Linnaeus University, Faculty of Technology, Department of Physics and Electrical Engineering.
    Flipped Classroom och Digitala Materiel: En Karaktärisering av Tre Naturvetenskapliga Ämneslärares Användning av Digitala Hjälpmedel2018Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    IT- och IKT-kompetens utgör en stor del av såväl internationell som svensk utbildningsforskning och enda sedan 60-talet har regeringen gjort satsningar med ändamål att förbättra lärares och elevers kompetens inom dessa områden. Den internationella strävan är att läroplaner införlivar mål för förbättrad IT- och IKT-kompetens, för att förbereda elever inför en arbetsmarknad som alltmer kräver teknologiska kompetenser. I den svenska forskningen har det visat sig att användningen av IT i den svenska skolan har ökat märkbart de senaste åren. PISA-undersökningen har visat att Sverige har låga resultat i problemlösning och att dessa resultat samvarierar med hög användning av IT. Vidare kompetensutveckling behövs och lärare bör anpassa sin undervisning utefter de teknologiska verktygens närvaro i den svenska skolan. Flipped Classroom är en undervisningsmetodik som innebär en betydande omordning av aktiviteter i den klassiska undervisningen, med avseende på vad som sker i klassrummet och vad som sker utanför klassrummet. Vidare ämnar metodiken att tydligt integrera digitala materiel i undervisningen. Framtida forskning bör undersöka hur Flipped Classroom-lärare väljer att utforma deras videoföreläsningar och övriga datorbaserade instruktioner. Detta examensarbete söker finna svar på hur och i vilket syfte Flipped Clasroom-lärare i de naturvetenskapliga ämnena använder digitala materiel i sin flippade undervisning samt ge en överblick av dessa. Tre naturvetenskapliga ämneslärare som använder Flipped Classroom har intervjuats. Det är alltså intervjuerna som utgör den empiriska grunden för detta arbete. Vidare innefattar detta arbete en konstruktion av en lämplig modell för att karaktärisera Flipped Classroom-lärares användning av digitala materiel. Karaktäriseringen indikerar att övervägande del av de digitala materielen används för datorbaserad instruktion utanför klassrummet. Totalt sett utgör 57 % datorbaserad instruktion och 30 % elev-centrerade aktiviteter i klassrummet. Resterande 13 % består av digitala materiel som till övervägande del består i mjukvaror för automatisk rättning av prov. För de intervjuade lärarna gäller att övervägande del av samtliga materiel används för att förmedla det centrala innehållet i respektive kurser. Men individuella skillnader finns. Totalt sett så utgör ungefär 52 % av samtliga materiel, användingsområden som ämnar att elever antingen ska återge kunskap eller lagra den i långtidsminnet. Det visar sig också att större delen av dessa användningsområden samtidigt innebär omfattande förändringar av undervisningsmoment.

  • 25.
    Grell, Lina
    Linnaeus University, Faculty of Technology, Department of Physics and Electrical Engineering.
    ”Det är typ det krångligaste som finns”: -En kvantitativ studie om hur laborationer kan möta elevers vardagsföreställningar om Newtons tredje lag Författare: Lina2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Skolinspektionen (2010) lyfter i sin granskning av fysikundervisningen att många eleveranser att ämnet är svårt. Forskning tyder på att anledningen till att elever anser attfysiken är svår beror på de vardagsföreställningar som eleverna har. Dessavardagsföreställningar försvårar elevers möjlighet att ta till sig fysikundervisningen dåde ofta står i direkt motsats till fysikens lagar. Frågan är därför hur lärare kan arbetaaktivt mot vardagsföreställningarna. I den här studien besvarar ett fyrtiotalniondeklassare två separata enkäter om begreppet kraft. Mellan enkäterna delas elevernain i mindre grupper och genomför laborationer för att sedan diskutera sina resultat medvarandra i helklassdiskussion. Grupperna utför olika laborationer och presenterar sedansina resultat för övriga klasskamrater. Resultaten från enkäterna visade attlaborationerna upphävde majoriteten av elevernas vardagsföreställningar. Vi kan därfördra slutsatsen att fysikundervisningen kan och bör arbeta mer aktivt med att mötavardagsföreställningarna genom laborationer och diskussioner.

  • 26. Gustafsson, Mats
    et al.
    Nordebo, Sven
    Växjö University, Faculty of Mathematics/Science/Technology, School of Mathematics and Systems Engineering.
    Bandwidth, Q factor, and resonance models of antennas2006In: Progress in Electromagnetics Research PIER, Vol. 62, p. 1-20Article in journal (Refereed)
    Abstract [en]

    In this paper, we introduce a first order accurate resonance model based on a second order Pade approximation of the reflection coefficient of a narrowband antenna. The resonance model is characterized by its Q factor, given by the frequency derivative of the reflection coefficient. The Bode-Fano matching theory is used to determine the bandwidth of the resonance model and it is shown that it also determines the bandwidth of the antenna for sufficiently narrow bandwidths. The bandwidth is expressed in the Q factor of the resonance model and the threshold limit on the reflection coefficient. Spherical vector modes are used to illustrate the results. Finally, we demonstrate the fundamental difficulty of finding a simple relation between the Q of the resonance model, and the classical Q defined as the quotient between the stored and radiated energies, even though there is usually a close resemblance between these entities for many real antennas.

  • 27. Gustafsson, Mats
    et al.
    Nordebo, Sven
    Växjö University, Faculty of Mathematics/Science/Technology, School of Mathematics and Systems Engineering.
    Cramer-Rao Lower Bounds for Inverse Scattering Problems of Multilayer Structures2006In: Inverse Problems, Vol. 22, p. 1359-1380Article in journal (Refereed)
    Abstract [en]

    In this paper, the inverse scattering problem of amultilayer structure is analysed with the Fisher information matrix and the Cramer–Rao lower bound (CRLB). The CRLB quantifies the ill-posedness of the inverse scattering problem in terms of resolution versus estimation accuracy based on the observation of noisy data. The limit for feasible inversion is identified by an asymptotic eigenvalue analysis of the Toeplitz Fisher information matrix and an application of the sampling theorem. It is shown that the resolution is inversely proportional to the bandwidth of the reflection data and that the CRLB increases linearly with the number of slabs. The transmission data give a rank-1 Fisher information matrix which can approximately reduce the CRLB by a factor of 4. Moreover, the effect of dispersive material parameters and simultaneous estimation of two material parameters are analysed. The results are illustrated with numerical examples.

  • 28.
    Gustafsson, Stefan
    Linnaeus University, Faculty of Science and Engineering, School of Computer Science, Physics and Mathematics.
    Electromagnetic dispersion modeling and analysis for HVDC power cables2012Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    Derivation of an electromagnetic model, regarding the wave propagation in a very long (10 km or more) High Voltage Direct Current (HVDC) power cable, is the central part of this thesis. With an existing “perfect” electromagnetic model there are potentially a wide range of applications.The electromagnetic model is focused on frequencies between 0 and 100 kHz since higher frequencies essentially will be attenuated. An exact dispersion relation is formulated and the propagation constant is computed numerically. The dominating mode is the first Transversal Magnetic (TM) mode of order zero, denoted TM01, which is also referred to as the quasi-TEM mode. A comparison is made with the second propagating TM mode of order zero denoted TM02. The electromagnetic model is verified against real time data from Time Domain Reflection (TDR) measurements on a HVDC power cable. A mismatch calibration procedure is performed due to matching difficulties between the TDR measurement equipment and the power cable regarding the single-mode transmission line model.An example of power cable length measurements is addressed, which reveals that with a “perfect” model the length of an 80 km long power cable could be estimated to an accuracy of a few centimeters. With the present model the accuracy can be estimated to approximately 100 m.In order to understand the low-frequency wave propagation characteristics, an exact asymptotic analysis is performed. It is shown that the behavior of the propagation constant is governed by a square root of the complex frequency in the lowfrequency domain. This thesis also focuses on an analysis regarding the sensitivity of the propagation constant with respect to some of the electric parameters in the model. Variables of interest when performing the parameter sensitivity study are the real relative permittivityand the conductivity.

  • 29.
    Hjelmfors, Ingemar
    Linnaeus University, Faculty of Technology, Department of Physics and Electrical Engineering.
    Gymnasieelevers uppfattning av fysikämnet.2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Syftet med detta arbete är att försöka komma fram till hur elever som läser tekniskt och naturvetenskapligt program på gymnasiet uppfattar ämnet fysik. En enkät ligger till grund för undersökningen. Enligt eleverna blir ämnet tråkigt när det är för mycket teori och muntlig undervisning. Däremot blir ämnet intressantare när eleverna får ägna sig åt laborationer och experiment.

    En viktig faktor för både undervisningen och trivseln i klassrummet är läraren. Resultatet av undervisningen påverkas också positivt om eleverna har roligt när de undervisas. Överlag är fysikämnet intressant enligt eleverna och det finns ett tydligt intresse för att få förståelse för olika fenomen samtidigt som flertalet elever ser valet av gymnasieprogram som en framtidsinvestering.

  • 30.
    Ishiwatari, T.
    et al.
    Steklov Mathematical Institute, Moscow.
    Khrennikov, Andrei
    Växjö University, Faculty of Mathematics/Science/Technology, School of Mathematics and Systems Engineering.
    Nilsson, Börje
    Växjö University, Faculty of Mathematics/Science/Technology, School of Mathematics and Systems Engineering.
    Volovich, Igor
    Steklov Mathematical Institute, Moscow.
    Quantum Field theory and Distance Effects for Polarization Correlations in Waveguides2009In: Mathematical modelling of wave phenomena: 3rd Conference on Mathematical Modelling of Wave Phenomena, Växjö, Sweden, 9 – 13 June 2008, Melville, New York: American Institute of Physics (AIP), 2009, p. 276-285Conference paper (Refereed)
    Abstract [en]

     

    Quantization of Maxwell’s equations in waveguides is considered together with an analysis of the quantum correlation functions of the radiation field. Both the spatial and temporal dependence of the polarization correlation functions for entangled states are evaluated. Predictions for experiments for the study of the spatial dependence of the polarization correlation functions for entangled photons are given.

     

  • 31.
    Jonasson, Frida
    Linnaeus University, Faculty of Technology, Department of Physics and Electrical Engineering.
    Newtons tredje lag – inte en självklarhet: En kvantitativ undersökning om elevers vardagsföreställningar och laboration som möjligt arbetssätt för att utmana dessa.2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Syftet med detta arbete är att undersöka om, och i så fall vilka vardagsföreställningar elever i grundskolans senare år besitter. Undersökningen utgör ett didaktiskt syfte som bidrar till ökad insikt i dels elevers föreställningar om fysikaliska fenomen, men även om det är möjligt att finna ett arbetssätt som är effektivt och tillräckligt innehållsrikt för att utmana elevernas förståelse och kunskaper. De frågeställningar arbetet utgår ifrån är om resultatet för grundskoleelevernas undersökning stämmer överens med tidigare forskning, samt om laboration är en fungerande metod för att förändra vardagsföreställningar. Det är omkring fyrtio deltagande elever i årskurs 7 och årskurs 8 från två olika kommunala grundskolor. Undersökningen delas in i del A och del B, där del A utgörs av en enkätundersökning samt där del B består av en laboration med efterföljande enkätundersökning. De båda enkäterna är desamma för att på effektivaste sätt upptäcka och mäta föreställningarnas utbredning bland eleverna. Undersökningen i del A visar att eleverna besitter de vardagsföreställningar som tidigare forskning visar. Anledningen till dessa kan bland annat bero på situationens kontext, kontakten mellan två livlösa föremål eller att det ena föremålet är mer dominant än den andra då de påverkar varandra. Resultatet på den efterföljande enkätundersökningen i del B visar att somliga föreställningar fortfarande finns kvar bland vissa elever, dock har majoriteten av eleverna förändrat sina föreställningar till de vetenskapliga förklaringarna.

  • 32.
    Khamitova, Raisa
    Växjö University, Faculty of Mathematics/Science/Technology, School of Mathematics and Systems Engineering.
    Symmetries and conservation laws2009Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    Conservation laws play an important role in science. The aim of this thesis is to provide an overview and develop new methods for constructing conservation laws using Lie group theory. The derivation of conservation laws for invariant variational problems is based on Noether’s theorem. It is shown that the use of Lie-Bäcklund transformation groups allows one to reduce the number of basic conserved quantities for differential equations obtained by Noether’s theorem and construct a basis of conservation laws. Several examples on constructing a basis for some well-known equations are provided.

    Moreover, this approach allows one to obtain new conservation laws even for equations without Lagrangians. A formal Lagrangian can be introduced and used for computing nonlocal conservation laws. For self-adjoint or quasi-self-adjoint equations nonlocal conservation laws can be transformed into local conservation laws.

    One of the fields of applications of this approach is electromagnetic theory, namely, nonlocal conservation laws are obtained for the generalized Maxwell-Dirac equations. The theory is also applied to the nonlinear magma equation and its nonlocal conservation laws are computed.

  • 33.
    Khrennikov, Andrei
    Växjö University, Faculty of Mathematics/Science/Technology, School of Mathematics and Systems Engineering. Matematik.
    Nonlinear Schrödinger equations from prequantum classical statistical field theory2006In: Physics Letters A, ISSN 0375-9601, Vol. 357, no N 3, p. 171-176Article in journal (Refereed)
    Abstract [en]

    We developed classical statistical field theory

  • 34.
    Khrennikov, Andrei
    Växjö University, Faculty of Mathematics/Science/Technology, School of Mathematics and Systems Engineering. Matematik.
    Quantum mechanics from time scaling and random fluctuations at the "quick time scale''2006In: NUOVO CIMENTO DELLA SOCIETA ITALIANA DI FISICA B-GENERAL, ISSN 1594-9982, Vol. 121, p. 1005-1021Article in journal (Refereed)
    Abstract [en]

    Quantum averages via prequantum field fluctuations

  • 35.
    Khrennikov, Andrei
    Linnaeus University, Faculty of Technology, Department of Mathematics.
    Quantum-like modeling of cognition2015In: Frontiers in Physics, E-ISSN 2296-424X, Vol. 3, article id 77Article in journal (Refereed)
    Abstract [en]

    This paper begins with a historical review of the mutual influence of physics and psychology, from Freud's invention of psychic energy inspired by von Boltzmann' thermodynamics to the enrichment quantum physics gained from the side of psychology by the notion of complementarity (the invention of Niels Bohr who was inspired by William James), besides we consider the resonance of the correspondence between Wolfgang Pauli and Carl Jung in both physics and psychology. Then we turn to the problem of development of mathematical models for laws of thought starting with Boolean logic and progressing toward foundations of classical probability theory. Interestingly, the laws of classical logic and probability are routinely violated not only by quantum statistical phenomena but by cognitive phenomena as well. This is yet another common feature between quantum physics and psychology. In particular, cognitive data can exhibit a kind of the probabilistic interference effect. This similarity with quantum physics convinced a multi-disciplinary group of scientists (physicists, psychologists, economists, sociologists) to apply the mathematical apparatus of quantum mechanics to modeling of cognition. We illustrate this activity by considering a few concrete phenomena: the order and disjunction effects, recognition of ambiguous figures, categorization-decision making. In Appendix 1 of Supplementary Material we briefly present essentials of theory of contextual probability and a method of representations of contextual probabilities by complex probability amplitudes (solution of the “inverse Born's problem”) based on a quantum-like representation algorithm (QLRA).

  • 36.
    Khrennikov, Andrei
    Växjö University, Faculty of Mathematics/Science/Technology, School of Mathematics and Systems Engineering. Matematik.
    Replica symmetry breaking related to a general ultrametric space I: replica matrices and functionals2006In: Physica A: Statistical Mechanics and its Applications, ISSN 0378-4371, E-ISSN 1873-2119, Vol. 359, p. 222-240Article in journal (Refereed)
    Abstract [en]

    We study the replica symmetry breaking related to a general ultrametric space, in particular, replica matrices and functionals

  • 37.
    Larsson, Johanna
    et al.
    Uppsala University.
    Airey, John
    Uppsala University.
    Discourse Models in Swedish Physics Teacher Training: Potential Effects on Professional Identity2015In: EARLI 2015 Book of Abstracts, 2015, p. 378-378Conference paper (Refereed)
    Abstract [en]

    Introduction

    In Sweden, the training of secondary physics teachers generally consists of three parts: physics courses in the physics department, pedagogical core courses in the education department and teaching practice in schools. In this paper we study the discourse models enacted in these three training environments at a large university in Sweden. Our interest is the potential effects these discourse models may have on trainee physics teachers’ professional identity building.

    Building a professional identity

    Teacher training has numerous goals. Apart from learning subject matter and pedagogical skills, trainees are also in the process of building their professional teacher identity. Here, we argue that in order to support this process as effectively as possible we need to better understand the role the training environment plays in this identity-building process.

    The concept of professional identity has been used within educational research in a variety of ways (see for example summaries in Beauchamp & Thomas, 2009 and Beijaard, Meijer, & Verloop, 2004). For our purposes, we follow Connelly and Clandinin (1999) who view professional identity as consisting of the set of narratives teachers tell about what it means to be a teacher. In order to be judged as professional, these narratives need to be framed within accepted discourse models. As Gee points out:

    “[Discourse] allows (and requires) people to be (for a time and place) socioculturally distinctive who's and to accomplish socioculturally distinctive what's. These who's and what's are always defined, partially, in opposition to other sorts of who's and what's, and are always related to models of what count as "valuable" (and "normal") people, activities, and things.” (2005, p. 31).

    Thus, our aim is to study the potential effects of a Swedish teacher training programme on trainee physics teachers’ professional identity-building. What interests us are the discourse models that are enacted in the three environments that trainee physics teachers encounter, and the affordances and constraints for the construction of professional identities that these models entail.

    Methodology – data collection – analysis

    We conducted semi-structured interviews (Kvale, 1996) with nine teacher educators (three physics lecturers, three pedagogy lecturers and three school placement supervisors). The interviews were guided by a smaller number of overarching themes, such as the informant’s opinion about what physics teacher students need to learn. Each of the themes was followed up with open-ended questions in order to elicit the particular concerns of the informant. The interviews lasted around 90 minutes and were later transcribed verbatim, iteratively coded and analysed thematically (Bogdan & Biklen, 1992)

    Findings

    Our analysis resulted in a number of distinct and potentially competing discourse models (Gee 2005) that are enacted in the three environments trainee physics teachers meet. In this paper we particularly focus on the ‘physics expert’ model (see figure 1). Our reason for focusing on this particular model is that it dominates amongst both teacher educators at the physics department and school placement supervisors. In this model, the primary goal of physics education, both in secondary school and at university level is to create future physics experts.

    Figure 1: The physics expert discourse model

    In the physics expert discourse model current research into physics and its applications is seen as exciting and motivating both for students and teachers. In contrast, secondary school subject matter is viewed as inherently boring—something that needs to be made interesting. Following this logic, one important thing for trainee teachers to learn is how to keep up with new discoveries in physics in order to make school physics exciting and meaningful.

    The physics expert model co-exists with several other discourse models that are more likely to be invoked in the education department. These models value quite different goals such as the development of practical skills, reflective practice, critical thinking and citizenship.

     

    Educational significance

    Invoking the physics expert model makes the building of a professional identity problematic for trainee physics teachers in a number of ways. First choosing to become a secondary school teacher does not sit very well with the valuing of a physics expert identity. If focused, cutting-edge research is what is valued, why would anyone choose to go and work with physics in an unfocused, general manner in schools? Second, the underlying premises of many of the courses trainee physics teachers take in the education department are difficult to reconcile with this model. For example, if the main role of a physics teacher is the creation of future physicists, important parts of the curriculum such as developing a scientifically literate society become relegated to a subsidiary status.  

    Conclusions

    We have identified a number of discourse models that we claim tacitly steer what is signalled as valued (and not valued) in the teacher-training programme we studied. For teacher trainers, we argue that a better understanding of these models will allow conscious, informed decisions to be taken about their own teaching practice. For prospective teachers, knowledge of these models is important since it empowers them to question the kind of teacher they want to become. Going forward it would be interesting to see whether similar models can be found in other teacher training programmes both within Sweden and in other countries.

    References

    Beauchamp, C., & Thomas, L. (2009). Understanding teacher identity: an overview of issues in the literature and implications for teacher education. Cambridge Journal of Education, 39(2), 175–189.

    Beijaard, D., Meijer, P. C., & Verloop, N. (2004). Reconsidering research on teachers’ professional identity. Teaching and Teacher Education, 20(2), 107–128.

    Bogdan, R., & Biklen, S. K. (1992). Qualitative research for education : an introduction to theory and methods. Boston: Allyn and Bacon.

    Connelly, F. M., & Clandinin, D. J. (1999). Shaping a professional identity : stories of educational practice. New York: Teachers College Press.

    Gee, J. P. (2005). An introduction to discourse analysis : theory and method. New York: Routledge.

    Kvale, S. (1996). Interviews : an introduction to qualitative research interviewing. Thousand Oaks: SAGE.

  • 38.
    Linder, Cedric
    et al.
    Uppsala university.
    Volkwyn, Trevor
    Uppsala university.
    Airey, John
    Uppsala university.
    Wikman, Susanne
    Linnaeus University, Faculty of Health and Life Sciences, Department of Chemistry and Biomedical Sciences.
    Towards modelling formal learning in terms of the multimodal emergence of transduction.2017Conference paper (Refereed)
    Abstract [en]

    Disciplinary learning is a multimodal endeavour that calls for achieving representational competency (Linder et al 2014), which is constituted from the coordination of disciplinary semiotic resources (Airey & Linder, in press). Examples of these semiotic resources for disciplines such as physics and chemistry are mathematics, graphs, gestures, diagrams and language. The effective learning of complex subjects such as these presents many unsolved challenges. In order to begin working towards solving these challenges much still needs to be done to deepen our understanding of how such disciplinary learning takes place. Taking the idea that formal learning is made possible through experiencing specific patterns of variation (Marton 2015), we will use our analysis of student-engagement data to present a case for seeing complex learning in terms of the multimodal emergence (Davis & Sumara, 2006) of transduction (Kress, 2010).  We use these results to propose a model of disciplinary learning that characterizes the multimodal emergence of transduction in terms of the start of a journey towards achieving fluency in a critical constellation of semiotic resources (Airey & Linder 2009; in press) for a given object of learning.

    References

    Airey, J. & Linder, C. (in press) Social Semiotics in University Physics Education, in Treagust, D., Duit R., Fischer, H. (eds) Multiple Representations in Physics Education: Springer.

    Airey, J., & Linder, C. (2009). A disciplinary discourse perspective on university science learning: Achieving fluency in a critical constellation of modes. Journal of Research in Science Teaching, 46(1), 27-49.

    Kress G. 2010. Multimodality. A Social Semiotic Approach to Contemporary Communication. London: Routledge.

    Davis, B., & Sumara, D. (2006). Complexity and education: Inquiries into learning, teaching and research: Erlbaum.

    Linder, A., Airey, J., Mayaba, N., & Webb, P. (2014). Fostering Disciplinary Literacy? South African Physics Lecturers’ Educational Responses to their Students’ Lack of Representational Competence. African Journal of Research in Mathematics, Science and Technology Education, 18(3), 242-252. 

    Marton, F. (2015). Necessary Conditions of learning: Routledge

  • 39.
    Lundbäck, Jonas
    et al.
    Växjö University, Faculty of Mathematics/Science/Technology, School of Mathematics and Systems Engineering.
    Nordebo, Sven
    Växjö University, Faculty of Mathematics/Science/Technology, School of Mathematics and Systems Engineering.
    Gustafsson, Mats
    A Generic Electromagnetic Model for DOA Estimation using Arbitrary Multiport Antennas2006In: IEEE International Symposium on Antennas and Propagation, 2006, p. 2549-2552Conference paper (Refereed)
    Abstract [en]

    A mathematical framework is introduced for optimization of antenna near-field imaging problems, based on the multipole expansion of the electromagnetic field, the Fisher information to quantify the quality of data and use of modern interior point convex optimization techniques. We consider the general problem of optimizing the measurement sensor allocation for parameter estimation in distributed systems, and in particular the problem of optimizing the measurement set-up for antenna near-field estimation. As an application example for antenna near-field imaging, we consider a relevant measurement set-up using cylindrical probing coordinates. The convex optimization problem is examined using duality theory, and it is shown that several structural properties of the optimal measurement problem can be exploited in developing an efficient interior point optimization method. In particular, we show that the cylindrical measurement set-up yields a Fisher information matrix with block diagonal structure, a feature which can be directly exploited in the optimization algorithm by reducing the number of dual decision variables.

  • 40.
    Luu, Thi Le Hang
    Linnaeus University, Faculty of Technology, Department of Physics and Electrical Engineering.
    Laborationen i fysikundervisningen: lärares mål med olika typer av laborationer och vilka av dessa mål eleverna uppnår2016Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Mitt arbete gjordes för att ta reda på vilken typ av laboration som är vanligast i fysikundervisningen på gymnasiet, vilka mål lärare har med olika typer av laborationer, samt vilka av målen elever själva tycker att de har uppnått i samband med laboration. Uppdelning och indelandet av laborationerna är grundat på tillvägagångssättet i dess utförande. Denna undersökning behandlar framförallt deduktiv respektive induktiv laboration.

    Undersökningen genomfördes på en gymnasieskola och de berörda eleverna går på ett naturvetenskapligt program. De fick svara på två enkäter, en vid deduktiv laboration och en vid induktiv laboration, medan lärarna intervjuades. Resultatet visar att den vanligaste laborationen som används i fysikundervisningen är den deduktiva laborationen. Lärarna vill uppnå fyra huvudmål: länka teori till praktik, utveckla praktiska och experimentella färdigheter, förmedla vetenskapliga metoder, öka motivationen. Detta resultat stämmer väl överens med tidigare forskningrapporter och böcker från min litteraturgenomgång. Resultatet av enkäterna visar att eleverna själva tycker att de uppnår lärarens viktigaste mål med laborationerna, men deras egen bedömning stämmer inte överens med vad de verkligen kan. Detta bekräftar också tidigare forskningsresultat. Eleverna har svårt att uppnå laborationernas mål.

  • 41.
    Mattias, Davidsson
    Linnaeus University, Faculty of Engineering and Technology, Department of Physics and Electrical Engineering.
    Creation and Evaluation of a Multimodal touch based Application for Learning the Physics of Motion2013Independent thesis Advanced level (degree of Master (One Year)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    A prototype multimodal tablet application for learning the physics of motion has been developed tested and evaluated. By moving their finger across the screen the application enables the user to map its position and velocity in real-time in terms of graphs. The learning outcome of those test subjects using the application was compared to a group that had the same procedure shown to them, as well as getting an explanation of all the physics involved. There was a small but not significant difference in performance between these groups on a post-test. However, a larger (arguably significant) difference was seen between the male and female test subjects for the sub-set of questions of a more analytical nature. 

  • 42.
    Melkikh, Alexey V.
    et al.
    Ural Federal University, Russia.
    Khrennikov, Andrei
    Linnaeus University, Faculty of Technology, Department of Mathematics.
    Quantum-like model of partially directed evolution2017In: Progress in Biophysics and Molecular Biology, ISSN 0079-6107, E-ISSN 1873-1732, Vol. 125, p. 36-51Article in journal (Refereed)
    Abstract [en]

    The background of this study is that models of the evolution of living systems are based mainly on the evolution of replicators and cannot explain many of the properties of biological systems such as the existence of the sexes, molecular exaptation and others. The purpose of this study is to build a complete model of the evolution of organisms based on a combination of quantum-like models and models based on partial directivity of evolution. We also used optimal control theory for evolution modeling. We found that partial directivity of evolution is necessary for the explanation of the properties of an evolving system such as the stability of evolutionary strategies, aging and death, the presence of the sexes. The proposed model represents a systems approach to the evolution of species and will facilitate the understanding of the evolution and biology as a whole.

  • 43.
    Nilsson, Börje
    Växjö University, Faculty of Mathematics/Science/Technology, School of Mathematics and Systems Engineering.
    Determination of pitch in twisted cylinders by electromagnetic scattering2006In: Wave Motion, Vol. 43, no 3, p. 259-271Article in journal (Refereed)
  • 44.
    Nilsson, Börje
    Växjö University, Faculty of Mathematics/Science/Technology, School of Mathematics and Systems Engineering. Matematik.
    Mathematical Modeling of Wave phenomena: 2nd Conference on Mathematical Modelling of Wave Phenomena, Växjö, Sweden2006Conference proceedings (editor) (Other (popular science, discussion, etc.))
  • 45.
    Nilsson, Börje
    et al.
    Växjö University, Faculty of Mathematics/Science/Technology, School of Mathematics and Systems Engineering. matematik.
    Boij, Susann
    Acoustic Reflection for a Jet Pipe Revisited2008In: 14th AIAA/CEAS Aeroacoustics Conference, Vancouver 5-7 May 2008, American Institute of Aeronautics and Astronautics (AIAA), Reston, VA , USA , 2008Conference paper (Other academic)
  • 46.
    Nilsson, Börje
    et al.
    Växjö University, Faculty of Mathematics/Science/Technology, School of Mathematics and Systems Engineering.
    Fishman, LoisMDF International, USA.
    Mathematical Modeling of Wave phenomena: 2nd Conference on Mathematical Modelling of Wave Phenomena, Växjö, Sweden, 14 – 19 August 20052006Conference proceedings (editor) (Other academic)
    Abstract [en]

    This conference illuminates and benefits from relations between different types of waves, i.e., quantum physics methods in classical wave modeling. The proceedings are intended for researchers and graduate students in fundamental as well as applied sciences. The preface classifies and summarizes the conference giving relations between the papers.

  • 47.
    Nilsson, Börje
    et al.
    Växjö University, Faculty of Mathematics/Science/Technology, School of Mathematics and Systems Engineering.
    Fishman, LoisMDF International, USA.Karlsson, AndersElektro- och informationsteknik, LTH.Nordebo, SvenVäxjö University, Faculty of Mathematics/Science/Technology, School of Mathematics and Systems Engineering.
    Mathematical Modeling of Wave phenomena.: 3rd Conference on Mathematical Modelling of Wave Phenomena, Växjö, Sweden, 9 – 13 June 20082009Conference proceedings (editor) (Other academic)
    Abstract [en]

     

     

    This conference illuminates and benefits from relations between different types of waves, i.e., quantum physics methods in classical wave modeling. The proceedings are intended for researchers and graduate students in fundamental as well as applied sciences. The preface classifies and summarizes the conference giving relations between the papers.

     

     

     

     

     

     

  • 48.
    Nilsson, Börje
    et al.
    Växjö University, Faculty of Mathematics/Science/Technology, School of Mathematics and Systems Engineering. Matematik.
    Khrennikov, Andrei
    Växjö University, Faculty of Mathematics/Science/Technology, School of Mathematics and Systems Engineering. Matematik.
    Exact solutions of the Schrödinger equation2007In: AIP Conference Proceedings: Quantum Theory. Reconsideration of Foundations -4, American Institute of Physics, New York , 2007, p. 302-306Conference paper (Refereed)
    Abstract [en]

    Textbooks on quantum mechanics often give the impression that the Schrödinger equation can be solved exactly only for a few

    simple potential models. However, exact solutions are available in terms of hypergeometric functions and their confluent variants for the so-called Natanzon potentials. These potentials include the Pöschl-Teller, Manning-Rosen and Rosen-Morse potentials that are also special cases of the Eckart potential. The Natanzon potentials are reviewed and connections are made to problems in classical physics like propagation of electromagnetic waves in inhomogeneous media and of acoustic waves in a variable speed profile. The availability of exact solutions is of particular interest for the explicit construction of time evolution operators

    and in the solution of inverse scattering problems.

  • 49.
    Nordebo, Sven
    et al.
    Växjö University, Faculty of Mathematics/Science/Technology, School of Mathematics and Systems Engineering.
    Gustafsson, Mats
    On the Design of Optimal Measurements for Antenna Near-Field Imaging Problems2006In: AIP Conference Proceedings, 2006, p. 234-249Conference paper (Refereed)
    Abstract [en]

    A mathematical framework is introduced for optimization of antenna near-field imaging problems, based on the multipole expansion of the electromagnetic field, the Fisher information to quantify the quality of data and use of modern interior point convex optimization techniques. We consider the general problem of optimizing the measurement sensor allocation for parameter estimation in distributed systems, and in particular the problem of optimizing the measurement set-up for antenna near-field estimation. As an application example for antenna near-field imaging, we consider a relevant measurement set-up using cylindrical probing coordinates. The convex optimization problem is examined using duality theory, and it is shown that several structural properties of the optimal measurement problem can be exploited in developing an efficient interior point optimization method. In particular, we show that the cylindrical measurement set-up yields a Fisher information matrix with block diagonal structure, a feature which can be directly exploited in the optimization algorithm by reducing the number of dual decision variables.

  • 50.
    Nordebo, Sven
    et al.
    Växjö University, Faculty of Mathematics/Science/Technology, School of Mathematics and Systems Engineering.
    Gustafsson, Mats
    Statistical Signal Analysis for the Inverse Source Problem of Electromagnetics2006In: IEEE Transactions on Signal Processing, Vol. 54, no 6, p. 2357-2361Article in journal (Refereed)
    Abstract [en]

    A statistical signal analysis for the inverse source problem of electromagnetics is given. We consider the problem of estimating either the near field or the radiating current distribution from a measurement of the far field. The solution is derived via a linear operator formalism, and the ill-posedness of the reconstruction is quantified by using the Cramer-Rao lower bound which is explicitly given in terms of the multipole expansion of the electromagnetic field. A numerical study is included to illustrate the theoretical results.

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