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  • 1551.
    Abd-Elrady, Emad
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Division of Systems and Control. Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Automatic control.
    Söderström, Torsten
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Division of Systems and Control. Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Automatic control.
    Wigren, Torbjörn
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Division of Systems and Control. Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Automatic control.
    Periodic signal modeling based on Liénard's equation2003Report (Other academic)
  • 1552.
    Abd-Elrady, Emad
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Division of Systems and Control. Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Automatic control.
    Söderström, Torsten
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Division of Systems and Control. Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Automatic control.
    Wigren, Torbjörn
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Division of Systems and Control. Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Automatic control.
    Periodic signal modeling based on Liénard's equation2004In: IEEE Transactions on Automatic Control, ISSN 0018-9286, E-ISSN 1558-2523, Vol. 49, no 10, p. 1773-1778Article in journal (Refereed)
  • 1553.
    Abdelrahman, Wedissa
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Geophysics.
    Reprocessing of reflection seismic data from the Skåne area, southern Sweden2007Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    Seismic reflection surveying is a powerful method to explore the structures of the Earth’s

    crust and describe it is layers. It is also used extensively in the oil industry.

    Offshore seismic profiles were acquired in southern Sweden (Skane area) for petroleum exploration

    purposes, but no productive fields were discovered in that area. The seismic reflection data were

    collected and processed in the 1970s.

    The purpose of this thesis is to reprocess some of the seismic profiles from the 1970s with new

    processing programs to improve the results and compare it with the previous results. Offshore lines

    208, 206, 212 have been selected in this project because they cross each other and are close to a

    borehole with sonic data. The borehole lies close to lines 208 and 212 as seen from the Skane area

    map.

    Also this report can be used to introduce the reader to fundamentals of seismic data processing.

    The processing was done using Claritas software by applying standard processing steps to produce

    migrated stacked sections for every line as a final product.

  • 1554. Abdelrazek, Fathya
    et al.
    Skytt, Bernice
    Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Public Health and Caring Sciences.
    Aly, Magda
    El-Sabour, Mona Abd
    Ibrahim, Naglaa
    Engström, Maria
    Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Public Health and Caring Sciences.
    Leadership and management skills of first-line managers of elderly care and their work environment2010In: Journal of Nursing Management, ISSN 0966-0429, E-ISSN 1365-2834, Vol. 18, no 6, p. 736-745Article in journal (Refereed)
    Abstract [en]

    Aim To study the leadership and management skills of first-line managers (FLMs) of elderly care and their work environment in Egypt and Sweden. Background FLMs in Egypt and Sweden are directly responsible for staff and quality of care. However, FLMs in Sweden, in elderly care, have smaller units/organizations to manage than do their colleagues in Egypt. Furthermore, family care of the elderly has been the norm in Egypt, but in recent years institutional care has increased, whereas in Sweden, residential living homes have existed for a longer period. Methods A convenience sample of FLMs, 49 from Egypt and 49 from Sweden, answered a questionnaire measuring leadership and management skills, structural and psychological empowerment, job satisfaction and psychosomatic health. Results In both countries, FLMs' perceptions of their leadership and management skills and psychological empowerment were quite high, whereas scores for job satisfaction and psychosomatic health were lower. FLMs had higher values in several factors/study variables in Egypt compared with in Sweden. Conclusion and implications The work environment, both in Egypt and Sweden, needs to be improved to increase FLMs' job satisfaction and decrease stress. The cultural differences and levels of management have an effect on the differences between the two countries.

  • 1555.
    AbdelRehim, M
    et al.
    Uppsala University, Medicinska vetenskapsområdet, Faculty of Pharmacy, Department of Medicinal Chemistry.
    Karlen, A
    Uppsala University, Medicinska vetenskapsområdet, Faculty of Pharmacy, Department of Medicinal Chemistry.
    Zhang, L
    Uppsala University, Medicinska vetenskapsområdet, Faculty of Pharmacy, Department of Medicinal Chemistry.
    Kamel, M
    Uppsala University, Medicinska vetenskapsområdet, Faculty of Pharmacy, Department of Medicinal Chemistry.
    Hassan, M
    Enantiomer separation of underivatized tocainide and related compounds by CGC using ammonia as carrier gas1996In: JOURNAL OF MICROCOLUMN SEPARATIONS, Vol. 8, p. 151-Article in journal (Refereed)
  • 1556.
    Abdel-Rehim, Mohamed
    Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Pharmacy.
    Influence of ammonia as carrier gas on separation and detection performance in capillary gas chromatography 1994Doctoral thesis, comprehensive summary (Other academic)
  • 1557.
    Abdel-Rehim, Mohamed
    et al.
    Uppsala University, Medicinska vetenskapsområdet, Faculty of Pharmacy, Department of Medicinal Chemistry.
    Hassan, Moustapha
    Capillary gas chromatography of trichlorophenols using ammonia as carrier gas2000In: Journal of High Resolution Chromatography, Vol. 23, p. 156-Article in journal (Refereed)
  • 1558.
    Abdelzadeh, Ali
    et al.
    Örebro universitet, Institutionen för juridik, psykologi och socialt arbete.
    Zetterberg, Pär
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Government.
    Ekman, Joakim
    Centre for Baltic and East European Studies (CBEES), Södertörn University, Huddinge, Sweden.
    Procedural fairness and political trust among young people: Evidence from a panel study on Swedish high school students2015In: Acta Politica, ISSN 0001-6810, E-ISSN 1741-1416, Vol. 50, no 3, p. 253-278Article in journal (Refereed)
    Abstract [en]

    The role of ‘fair’ institutions in developing democratic legitimacy has received increased attention. Citizens who perceive – on basis of past experiences – that they are being treated fairly by authorities have been held to have greater trust in political institutions. However, previous studies on the relationship between procedural fairness and political trust have not paid sufficient attention to individuals with limited first-hand experiences of authorities. We examine the relationship on an authority that virtually all individuals meet early in life: the school. Using structural equation modeling on unique panel data covering 1,500 Swedish adolescents (ages ranging from 13 to 17), we find a reciprocal relationship: personal encounters with school authorities shape young people’s political trust; however, the images that adolescents get of the political system (through family, peers, media, etc.) have also consequences on their perceptions about the authorities they encounter in their daily lives. The analysis increases our understanding of how individuals form their political allegiances by showing that the relationship between fairness and trust is more dynamic than has previously been suggested: neither an accumulated set of experiences of authorities nor formal ties with political institutions (as voters, etc.) are required for a relationship to emerge. 

  • 1559. Abdesselam, A.
    et al.
    Adkin, P. J.
    Allport, P. P.
    Alonso, J.
    Andricek, L.
    Anghinolfi, F.
    Antonov, A. A.
    Apsimon, R. J.
    Atkinson, T.
    Batchelor, L. E.
    Bates, R. L.
    Beck, G.
    Becker, H.
    Bell, P.
    Bell, W.
    Benes, P.
    Bernabeu, J.
    Bethke, S.
    Bizzell, J. P.
    Blocki, J.
    Broklova, Z.
    Broz, J.
    Bohm, J.
    Booker, P.
    Bright, G.
    Brodbeck, T. J.
    Bruckman, P.
    Buttari, C. M.
    Butterworth, J. M.
    Campabadal, F.
    Campbell, D.
    Carpentier, C.
    Carroll, J. L.
    Carter, A. A.
    Carter, J. R.
    Casse, G. L.
    Cermak, P.
    Chamizo, M.
    Charlton, D. G.
    Cheplakov, A.
    Chesi, E.
    Chilingarov, A.
    Chouridou, S.
    Chren, D.
    Christinet, A.
    Chu, M. L.
    Cindro, V.
    Clocio, A.
    Civera, J. V.
    Clark, A.
    Colijn, A. P.
    Cooke, P. A.
    Costa, M. J.
    Costanzo, D.
    Dabrowski, W.
    Danielsen, K. M.
    Davies, V. R.
    Dawson, I.
    de Jong, P.
    Dervan, P.
    Doherty, F.
    Dolezal, Z.
    Donega, M.
    D'Onofrio, M.
    Dorholt, O.
    Drasal, Z.
    Dowell, J. D.
    Duerdoth, I. P.
    Duxfield, R.
    Dwuznik, M.
    Easton, J. M.
    Eckert, S.
    Eklund, L.
    Escobar, C.
    Fadeyev, V.
    Fasching, D.
    Feld, L.
    Ferguson, D. P. S.
    Ferrari, P.
    Ferrere, D.
    Fleta, C.
    Fortin, R.
    Foster, J. M.
    Fowler, C.
    Fox, H.
    Freestone, J.
    French, R. S.
    Fuster, J.
    Gadomski, S.
    Gallop, B. J.
    Garcia, C.
    Garcia-Navarro, J. E.
    Gibson, S.
    Gilchriese, M. G. D.
    Gonzalez, F.
    Gonzalez-Sevilla, S.
    Goodrick, M. J.
    Gorisek, A.
    Gornicki, E.
    Greenall, A.
    Greenfield, D.
    Gregory, S.
    Grigorieva, I. G.
    Grillo, A. A.
    Grosse-Knetter, J.
    Gryska, C.
    Guipet, A.
    Haber, C.
    Hara, K.
    Hartjes, F. G.
    Hauff, D.
    Haywood, S. J.
    Hegeman, S. J.
    Heinzinger, K.
    Hessey, N. P.
    Heusch, C.
    Hicheur, A.
    Hill, J. C.
    Hodgkinson, M.
    Hodgson, P.
    Horazdovsky, T.
    Hollins, T. I.
    Hou, L. S.
    Hou, S.
    Hughes, G.
    Huse, T.
    Ibbotson, M.
    Iglesias, M.
    Ikegami, Y.
    Ilyashenko, I.
    Issever, C.
    Jackson, J. N.
    Jakobs, K.
    Jared, R. C.
    Jarron, P.
    Johansson, P.
    Jones, R. W. L.
    Jones, T. J.
    Joos, D.
    Joseph, J.
    Jovanovic, P.
    Jusko, O.
    Jusko, V.
    Kaplon, J.
    Kazi, S.
    Ketterer, Ch.
    Kholodenko, A. G.
    King, B. T.
    Kodys, P.
    Koffeman, E.
    Kohout, Z.
    Kohriki, T.
    Kondo, T.
    Koperny, S.
    Koukol, H.
    Kral, V.
    Kramberger, G.
    Kubik, P.
    Kudlaty, J.
    Lacasta, C.
    Lagouri, T.
    Lee, S. C.
    Leney, K.
    Lenz, S.
    Lester, C. G.
    Liebicher, K.
    Limper, M.
    Lindsay, S.
    Linhart, V.
    Llosa, G.
    Loebinger, F. K.
    Lozano, M.
    Ludwig, I.
    Ludwig, J.
    Lutz, G.
    Lys, J.
    Maassen, M.
    Macina, D.
    Macpherson, A.
    MacWaters, C.
    Magrath, C. A.
    Malecki, P.
    Mandic, I.
    Mangin-Brinet, M.
    Marti-Garcia, S.
    Matheson, J. P.
    Matson, R. M.
    McMahon, S. J.
    McMahon, T. J.
    Meinhardt, J.
    Mellado, B.
    Melone, J. J.
    Mercer, I. J.
    Messmer, I.
    Mikulec, B.
    Mikuz, M.
    Minano, M.
    Mitsouak, V. A.
    Modesto, P.
    Moed, S.
    Mohn, B.
    Moncrieff, S.
    Moorhead, G.
    Morris, F. S.
    Morris, J.
    Morrissey, M.
    Moser, H. G.
    Moszczynski, A.
    Muijs, A. J. M.
    Murray, W. J.
    Muskett, D.
    Nacher, J.
    Nagai, K.
    Nakano, I.
    Nickerson, R. B.
    Nisius, R.
    Oye, O. K.
    O'Shea, V.
    Paganis, E.
    Parker, M. A.
    Parzefall, U.
    Pater, J. R.
    Peeters, S. J. M.
    Pellegrini, G.
    Pelleriti, G.
    Pernegger, H.
    Perrin, E.
    Phillips, P. W.
    Pilavova, L. V.
    Poltorak, K.
    Pospisil, S.
    Postranecky, M.
    Pritchard, T.
    Prokofiev, K.
    Rafi, J. M.
    Raine, C.
    Ratoff, P. N.
    Reznicek, P.
    Riadovikov, V. N.
    Richter, R. H.
    Robichaud-Veronneau, A.
    Robinson, D.
    Rodriguez-Oliete, R.
    Roe, S.
    Rudge, A.
    Runge, K.
    Saavedra, A.
    Sadrozinski, H. F. W.
    Sanchez, F. J.
    Sandaker, H.
    Saxon, D. H.
    Scheirich, D.
    Schieck, J.
    Seiden, A.
    Sfyrla, A.
    Slavicek, T.
    Smith, K. M.
    Smith, N. A.
    Snow, S. W.
    Solar, M.
    Sopko, B.
    Sopko, V.
    Sospedra, L.
    Spencer, E.
    Stanecka, E.
    Stapnes, S.
    Stastny, J.
    Strachko, V.
    Stradling, A.
    Stugu, B.
    Su, D. S.
    Sutcliffe, P.
    Szczygiel, R.
    Tanaka, R.
    Taylor, G.
    Teng, P. K.
    Terada, S.
    Thompson, R. J.
    Titov, M.
    Toczek, B.
    Tovey, D. R.
    Tratzl, G.
    Troitsky, V. L.
    Tseng, J.
    Turala, M.
    Turner, P. R.
    Tyndel, M.
    Ullan, M.
    Unno, Y.
    Vickey, T.
    Van der Kraaij, E.
    Viehhauser, G.
    Villani, E. G.
    Vitek, T.
    Anh, T. Vu
    Vorobiev, A. P.
    Vossebeld, J. H.
    Wachler, M.
    Wallny, R.
    Ward, C. P.
    Warren, M. R. M.
    Webel, M.
    Weber, M.
    Weidberg, A. R.
    Weilhammer, P.
    Wells, P. S.
    Wetzel, P.
    Whitley, M.
    Wiesmann, M.
    Wilhelm, I.
    Willenbrock, M.
    Wilmut, I.
    Wilson, J. A.
    Winton, J.
    Wolter, M.
    Wormald, M. P.
    Wu, S. L.
    Wu, X.
    Zhu, H.
    Bingefors, Nils
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Brenner, Richard
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    Ekelöf, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
    The ATLAS semiconductor tracker end-cap module2007In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, ISSN 0168-9002, E-ISSN 1872-9576, Vol. 575, no 3, p. 353-389Article in journal (Refereed)
    Abstract [en]

    The challenges for the tracking detector systems at the LHC are unprecedented in terms of the number of channels, the required read-out speed and the expected radiation levels. The ATLAS Semiconductor Tracker. (SCT) end-caps have a total of about 3 million electronics channels each reading out every 25 ns into its own on-chip 3.3 mu s buffer. The highest anticipated dose after 10 years operation is 1.4x10(14) cm(-2) in units of 1 MeV neutron equivalent (assuming the damage factors scale with the non-ionising energy loss). The forward tracker has 1976 double-sided modules, mostly of area similar to 70 cm(2), each having 2 x 768 strips read out by six ASICs per side. The requirement to achieve an average perpendicular radiation length of 1.5% X-0, while coping with up to 7 W dissipation per module (after irradiation), leads to stringent constraints on the thermal design. The additional requirement of 1500e(-) equivalent noise charge (ENC) rising to only 1800e(-) ENC after irradiation, provides stringent design constraints on both the high-density Cu/Polyimide flex read-out circuit and the ABCD3TA read-out ASICs. Finally, the accuracy of module assembly must not compromise the 16 mu m (r phi) resolution perpendicular to the strip directions or 580 mu m radial resolution coming from the 40 mrad front-back stereo angle. A total of 2210 modules were built to the tight tolerances and specifications required for the SCT. This was 234 more than the 1976 required and represents a yield of 93%. The component flow was at times tight, but the module production rate of 40-50 per week was maintained despite this. The distributed production was not found to be a major logistical problem and it allowed additional flexibility to take advantage of where the effort was available, including any spare capacity, for building the end-cap modules. The collaboration that produced the ATLAS SCT end-cap modules kept in close contact at all times so that the effects of shortages or stoppages at different sites could be rapidly resolved.

  • 1560. Abdesselam, A.
    et al.
    Akimoto, T.
    Allport, P. P.
    Alonso, J.
    Anderson, B.
    Andricek, L.
    Anghinolfi, F.
    Apsimon, R. J.
    Barbier, G.
    Barr, A. J.
    Batchelor, L. E.
    Bates, R. L.
    Batley, J. R.
    Beck, G. A.
    Bell, P. J.
    Belymam, A.
    Bernabeu, J.
    Bethke, S.
    Bizzell, J. P.
    Bohm, J.
    Brenner, Richard
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics, High Energy Physics.
    Brodbeck, T. J.
    Broklova, Z.
    Broz, J.
    De Renstrom, P. Bruckman
    Buttar, C. M.
    Butterworth, J. M.
    Carpentieri, C.
    Carter, A. A.
    Carter, J. R.
    Charlton, D. G.
    Cheplakov, A.
    Chesi, E.
    Chilingarov, A.
    Chouridou, S.
    Chu, M. L.
    Cindro, V.
    Ciocio, A.
    Civera, J. V.
    Clark, A.
    Coe, P.
    Colijn, A-P
    Cornelissen, T.
    Cosgrove, D. P.
    Costa, M. J.
    Dabrowski, W.
    Dalmau, J.
    Danielsen, K. M.
    Dawson, I.
    Demirkoz, B.
    Dervan, P.
    Dolezal, Z.
    Donega, M.
    D'Onofrio, M.
    Dorholt, O.
    Dowell, J. D.
    Drasal, Z.
    Duerdoth, I. P.
    Dwuznik, M.
    Eckert, S.
    Ekelöf, Tord
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics, High Energy Physics.
    Eklund, Lars
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics, High Energy Physics.
    Escobar, C.
    Fadeyev, V.
    Feld, L.
    Ferrari, P.
    Ferrere, D.
    Fiorini, L.
    Fortin, R.
    Foster, J. M.
    Fox, H.
    Fraser, T. J.
    Freestone, J.
    French, R.
    Fuster, J.
    Gadomski, S.
    Gallop, B. J.
    Garcia, C.
    Garcia-Navarro, J. E.
    Gibson, M. D.
    Gibson, S.
    Gilchriese, M. G. D.
    Godlewski, J.
    Gonzalez-Sevilla, S.
    Goodrick, M. J.
    Gorisek, A.
    Gornicki, E.
    Greenall, A.
    Grigson, C.
    Grillo, A. A.
    Grosse-Knetter, J.
    Haber, C.
    Hara, K.
    Hartjes, F. G.
    Hauff, D.
    Hawes, B. M.
    Haywood, S. J.
    Hessey, N. P.
    Hicheur, A.
    Hill, J. C.
    Hollins, T. I.
    Holt, R.
    Howell, D. F.
    Hughes, G.
    Huse, T.
    Ibbotson, M.
    Ikegami, Y.
    Issever, C.
    Jackson, J. N.
    Jakobs, K.
    Jarron, P.
    Johansen, L. G.
    Jones, T. J.
    Jones, T. W.
    de Jong, P.
    Joos, D.
    Jovanovic, P.
    Kachiguine, S.
    Kaplon, J.
    Kato, Y.
    Ketterer, C.
    Kobayashi, H.
    Kodys, P.
    Koffeman, E.
    Kohout, Z.
    Kohriki, T.
    Kondo, T.
    Koperny, S.
    Kramberger, G.
    Kubik, P.
    Kudlaty, J.
    Kuwano, T.
    Lacasta, C.
    LaMarra, D.
    Lane, J. B.
    Lee, S. -C
    Lester, C. G.
    Limper, M.
    Lindsay, S.
    Llatas, M. C.
    Loebinger, F. K.
    Lozano, M.
    Ludwig, I.
    Ludwig, J.
    Lutz, G.
    Lys, J.
    Maassen, M.
    Macina, D.
    Macpherson, A.
    MacWaters, C.
    McMahon, S. J.
    McMahon, T. J.
    Magrath, C. A.
    Malecki, P.
    Mandic, I.
    Mangin-Brinet, M.
    Marti-Garcia, S.
    Martinez-Mckinney, G. F. M.
    Matheson, J. M. C.
    Matson, R. M.
    Meinhardt, J.
    Mikulec, B.
    Mikuz, M.
    Minagawa, M.
    Mistry, J.
    Mitsou, V.
    Modesto, P.
    Moed, S.
    Mohn, B.
    Moorhead, G.
    Morin, J.
    Morris, J.
    Morrissey, M.
    Moser, H-G
    Muijs, A. J. M.
    Murray, W. J.
    Nagai, K.
    Nakamura, K.
    Nakamura, Y.
    Nakano, I.
    Nichols, A.
    Nicholson, R.
    Nickerson, R. B.
    Nisius, R.
    O'Shea, V.
    Oye, O. K.
    Palmer, M. J.
    Parker, M. A.
    Parzefall, U.
    Pater, J. R.
    Peeters, S. J. M.
    Pellegrini, G.
    Pernegger, H.
    Perrin, E.
    Phillips, A.
    Phillips, P. W.
    Poltorak, K.
    Pospisil, S.
    Postranecky, M.
    Pritchard, T.
    Rafi, J. M.
    Ratoff, P. N.
    Reznicek, P.
    Richter, R. H.
    Robinson, D.
    Roe, S.
    Rosenbaum, F.
    Rudge, A.
    Runge, K.
    Sadrozinski, H. F. W.
    Sandaker, H.
    Saxon, D. H.
    Schieck, J.
    Sedlak, K.
    Seiden, A.
    Sengoku, H.
    Sfyrla, A.
    Shimma, S.
    Smith, K. M.
    Smith, N. A.
    Snow, S. W.
    Solar, M.
    Solberg, A.
    Sopko, B.
    Sospedra, L.
    Spencer, E.
    Stanecka, E.
    Stapnes, S.
    Stastny, J.
    Stodulski, M.
    Stugu, B.
    Szczygiel, R.
    Tanaka, R.
    Tappern, G.
    Taylor, G.
    Teng, P. K.
    Terada, S.
    Thompson, R. J.
    Titov, M.
    Toczek, B.
    Tovey, D. R.
    Tricoli, A.
    Turala, M.
    Turner, P. R.
    Tyndel, M.
    Ullan, M.
    Unno, Y.
    Van der Kraaij, E.
    van Vulpens, I.
    Viehhauser, G.
    Villani, E. G.
    Vorobel, V.
    Vos, M.
    Wallny, R.
    Warren, M. R. M.
    Wastie, R. L.
    Weber, M.
    Weidberg, A. R.
    Weilhammer, P.
    Wells, P. S.
    Wilder, M.
    Wilhelm, I.
    Wilson, J. A.
    Wolter, M.
    The barrel modules of the ATLAS semiconductor tracker2006In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, ISSN 0168-9002, E-ISSN 1872-9576, Vol. 568, no 2, p. 642-671Article in journal (Refereed)
    Abstract [en]

    This paper describes the silicon microstrip modules in the barrel section of the SemiConductor Tracker (SCT) of the ATLAS experiment at the CERN Large Hadron Collider (LHC). The module requirements, components and assembly techniques are given, as well as first results of the module performance on the fully assembled barrels that make up the detector being installed in the ATLAS experiment.

  • 1561. Abdesselam, A.
    et al.
    Allport, P. P.
    Anderson, B.
    Andricek, L.
    Anghinolfi, F.
    Apsimon, R. J.
    Atkinson, T.
    Austin, A.
    Band, H.
    Barclay, P.
    Barr, A.
    Batchelor, L. E.
    Bates, R. L.
    Batley, J. R.
    Beck, G.
    Becker, H.
    Bell, P.
    Bell, W. H.
    Belymam, A.
    Benes, J.
    Benes, P.
    Berbee, E.
    Bernabeu, J.
    Bethke, S.
    Bingefors, Nils
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Bizzell, J. P.
    Blaszczak, Z. J.
    Blocki, J.
    Broz, J.
    Bohm, J.
    Brenner, Richard
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Brodbeck, T. J.
    de Renstrom, P. Bruckman
    Buis, R.
    Burton, G.
    Buskop, J.
    Buttar, C. M.
    Butterworth, J. M.
    Butterworth, S.
    Capocci, E.
    Carpentieri, C.
    Carter, A. A.
    Carter, J. R.
    Chamizo, M.
    Charlton, D. G.
    Cheplakov, A.
    Chilingarov, A.
    Chouridou, S.
    Chren, D.
    Chu, M. L.
    Cindro, V.
    Ciocio, A.
    Civera, J. V.
    Clark, A.
    Coe, P.
    Colijn, A. P.
    Cooke, P. A.
    Costa, M. J.
    Costanzo, D.
    Curtis-Rous, M.
    Dabinett, C.
    Dabrowski, W.
    Dalmau, J.
    Danielsen, K. M.
    D'Auria, S.
    Dawson, I.
    de Jong, P.
    Dervan, P.
    Dobson, E.
    Doherty, F.
    Dolezal, Z.
    Donega, M.
    D'Onofrio, M.
    Dorholt, O.
    Doubrava, M.
    Duerdoth, I. P.
    Duisters, C.
    Duxfield, R.
    Dwuznik, M.
    Eckert, S.
    Eklund, L.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Escobar, C.
    Evans, D. L.
    Fadeyev, V.
    Fasching, D.
    Feld, L.
    Ferguson, D. P. S.
    Ferrari, P.
    Ferrere, D.
    Fopma, J.
    Ford, P.
    Fortin, R.
    Foster, J. M.
    Fox, H.
    Fraser, T. J.
    Freestone, J.
    French, R. S.
    Fuster, J.
    Gallop, B. J.
    Galuska, M.
    Gannaway, F.
    Garcia, C.
    Garcia-Navarro, J. E.
    Gibson, M.
    Gibson, S.
    Gnanvo, K.
    Godlewski, J.
    Gonzalez, F.
    Gonzalez-Sevilla, S.
    Goodrick, M. J.
    Gorfine, G.
    Gorisek, A.
    Gornicki, E.
    Greenall, A.
    Greenfield, D.
    Gregory, S.
    Grillo, A. A.
    Grosse-Knetter, J.
    Gryska, C.
    Haddad, L.
    Hara, K.
    Harris, M.
    Hartjes, F. G.
    Hauff, D.
    Hawes, B.
    Hayler, T.
    Haywood, S. J.
    Heinemann, F.
    Heinzinger, K.
    Hessey, N. P.
    Heusch, C.
    Hicheur, A.
    Hill, J. C.
    Hodgkinson, M.
    Hodgson, P.
    Hollins, T. I.
    Holt, R.
    Homna, J.
    Horaziovsky, T.
    Howell, D.
    Hughes, G.
    Huse, T.
    Ibbotson, M.
    Ikegami, Y.
    Ilyashenko, I.
    Issever, C.
    Jakubek, J.
    Jackson, J. N.
    Jakobs, K.
    Jared, R. C.
    Jarron, P.
    Johansson, P.
    John, D.
    Jones, A.
    Jones, M.
    Jones, T. J.
    Joos, D.
    Joseph, J.
    Jovanovic, P.
    Jusko, J.
    Jusko, O.
    Kaplon, J.
    Karagoz-Unel, M.
    Ketterer, Ch.
    Kodys, P.
    Koffeman, E.
    Kohout, Z.
    Kohriki, T.
    Kok, H.
    Kondo, T.
    Koperny, S.
    Korporaal, A.
    Koukol, V.
    Kral, V.
    Kramberger, G.
    Kubik, P.
    Kudlaty, J.
    Kuilman, W.
    Kundu, N.
    Lacasta, C.
    Lacuesta, V.
    Lau, W.
    Lee, S. C.
    Leguyt, R.
    Leney, K.
    Lenz, S.
    Lester, C. G.
    Liang, Z.
    Liebicher, K.
    Limper, M.
    Lindquist, L. E.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Lindsay, S.
    Linhart, V.
    Lintern, A.
    Locket, C.
    Lockwood, M.
    Loebinger, F. K.
    Lozano, M.
    Ludwig, I.
    Ludwig, J.
    Lutz, G.
    Maassen, M.
    Macina, D.
    Macpherson, A.
    MacWaters, C.
    Magrath, C. A.
    Malecki, P.
    Mandic, I.
    Mangin-Brinet, M.
    Marshall, G.
    Marti-Garcia, S.
    Martinez-McKinney, G. F. M.
    Matheson, J. P.
    McEwan, F.
    McMahon, S. J.
    McPhail, D.
    Meinhardt, J.
    Mellado, B.
    Mercer, I. J.
    Messmer, I.
    Mikulec, B.
    Mikuz, M.
    Mima, S.
    Mistry, K.
    Mitra, A.
    Mitsou, V. A.
    Modesto, P.
    Moed, S.
    Mohn, B.
    Moles, R.
    Moorhead, G. F.
    Moreno, B.
    Morin, J.
    Morris, J.
    Moser, H. G.
    Moszczynski, A.
    Muijs, A. J. M.
    Munneke, B.
    Murray, W. J.
    Muskett, D.
    Nacher, J.
    Nagai, K.
    Naito, D.
    Nakano, I.
    Nelson, C.
    Nichols, A.
    Nickerson, R. B.
    Nisius, R.
    Noviss, J.
    Olcese, M.
    O'Shea, V.
    Oye, O. K.
    Paganis, S.
    Palmer, M. J.
    Parker, M. A.
    Parzefall, U.
    Pater, J. R.
    Pernegger, H.
    Perrin, E.
    Phillips, A.
    Phillips, P. W.
    Pieron, J. P.
    Poltorak, K.
    Pospisil, S.
    Postranecky, M.
    Pritchard, T.
    Prokofiev, K.
    Raine, C.
    Ratoff, P. N.
    Reitmeijer, A.
    Reznicek, P.
    Richter, R. H.
    Robichaud-Veronneau, A.
    Robinson, D.
    Robson, A.
    Rodriguez-Oliete, R.
    Roe, S.
    Rolfe, G.
    Rovenkamp, J.
    Runge, K.
    Saavedra, A.
    Sadrozinski, H. F. W.
    Sanchez, F. J.
    Sandaker, H.
    Schieck, J.
    Schuijlenburg, H.
    Siegrist, J.
    Seiden, A.
    Sfyrla, A.
    Simm, G.
    Slatter, J.
    Slavieek, T.
    Smith, B.
    Smith, K. M.
    Smith, N. A.
    Snippe, C.
    Snow, S. W.
    Solar, M.
    Solberg, A. O.
    Sopko, B.
    Sopko, V.
    Sospedra, L.
    Southern, G. D.
    Sowinski, M.
    Spencer, E.
    Spieler, H.
    Stanecka, E.
    Stapnes, S.
    Stastny, J.
    Steckl, I.
    Stodulski, M.
    Strachko, V.
    Stradling, A.
    Stugu, B.
    Sutcliffe, P.
    Szczygiel, R.
    Takashima, R.
    Tanaka, R.
    Tappern, G.
    Tarrant, J.
    Taylor, G. N.
    Temple, S.
    Teng, P. K.
    Terada, S.
    Thompson, R. J.
    Thresher, N. E.
    Titov, M.
    Tovey, D. R.
    Tratzl, G.
    Tricoli, A.
    Turala, M.
    Turner, P. R.
    Tyndel, M.
    Ullan, M.
    Unno, Y.
    Vickey, T.
    Vacek, V.
    Van der Kraaij, E.
    Van Ovenbeek, M.
    Viehhauser, G.
    Vu, C.
    Villani, E. G.
    Anh, T. Vu
    Vossebeld, J. H.
    Wachler, M.
    Wallny, R.
    Ward, C. P.
    Warren, M. R. M.
    Wastie, R.
    Weber, M.
    Weidberg, A. R.
    Weilhammer, P.
    Wells, P. S.
    Werneke, P.
    Wetzel, P.
    White, M. J.
    Wiesmann, M.
    Wilmut, I.
    Wilson, J. A.
    Wolter, M.
    Wormald, M. P.
    Wu, S. L.
    Wu, X.
    Zimmer, J.
    Zseneii, A.
    Zhu, H.
    Engineering for the ATLAS SemiConductor Tracker (SCT) end-cap2008In: Journal of Instrumentation, ISSN 1748-0221, E-ISSN 1748-0221, Vol. 3, article id P05002Article in journal (Refereed)
    Abstract [en]

    The ATLAS SemiConductor Tracker (SCT) is a silicon-strip tracking detector which forms part of the ATLAS inner detector. The SCT is designed to track charged particles produced in proton-proton collisions at the Large Hadron Collider (LHC) at CERN at an energy of 14 TeV. The tracker is made up of a central barrel and two identical end-caps. The barrel contains 2112 silicon modules, while each end-cap contains 988 modules. The overall tracking performance depends not only on the intrinsic measurement precision of the modules but also on the characteristics of the whole assembly, in particular, the stability and the total material budget. This paper describes the engineering design and construction of the SCT end-caps, which are required to support mechanically the silicon modules, supply services to them and provide a suitable environment within the inner detector. Critical engineering choices are highlighted and innovative solutions are presented - these will be of interest to other builders of large-scale tracking detectors. The SCT end-caps will be fully connected at the start of 2008. Further commissioning will continue, to be ready for proton-proton collision data in 2008.

  • 1562. Abdesselam, A.
    et al.
    Barr, A.
    Basiladze, S.
    Bates, R. L.
    Bell, P.
    Bingefors, N.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear and Particle Physics.
    Bohm, J.
    Brenner, R.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear and Particle Physics.
    Llatas, M. Chamizo
    Clark, A.
    Codispoti, G.
    Colijn, A. P.
    D'Auria, S.
    Dorholt, O.
    Doherty, F.
    Ferrari, P.
    Ferrere, D.
    Gornicki, E.
    Koperny, S.
    Lefevre, R.
    Lindquist, L-E.
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear and Particle Physics.
    Malecki, P.
    Mikulec, B.
    Mohn, B.
    Pater, J.
    Pernegger, H.
    Phillips, P.
    Robichaud-Veronneau, A.
    Robinson, D.
    Roe, S.
    Sandaker, H.
    Sfyrla, A.
    Stanecka, E.
    Stastny, J.
    Viehhauser, G.
    Vossebeldn, J.
    Wellsd, P.
    The detector control system of the ATLAS SemiConductor Tracker during macro-assembly and integration2008In: Journal of Instrumentation, ISSN 1748-0221, Vol. 3, p. P02007-Article in journal (Refereed)
    Abstract [en]

    The ATLAS SemiConductor Tracker (SCT) is one of the largest existing semiconductor detectors. It is situated between the Pixel detector and the Transition Radiation Tracker at one of the four interaction points of the Large Hadron Collider (LHC). During 2006-2007 the detector was lowered into the ATLAS cavern and installed in its final position. For the assembly, integration and commissioning phase, a complete Detector Control System (DCS) was developed to ensure the safe operation of the tracker. This included control of the individual powering of the silicon modules, a bi-phase cooling system and various types of sensors monitoring the SCT environment and the surrounding test enclosure. The DCS software architecture, performance and operational experience will be presented in the view of a validation of the DCS for the final SCT installation and operation phase.

  • 1563.
    Abdetedal, Mahsa
    et al.
    Institute of Geophysics, Tehran, 14155-6466, Iran.
    Shomali, Z. Hossein
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Geophysics. Institute of Geophysics, Tehran, 14155-6466, Iran.
    Gheitanchi, Mohammad Reza
    Institute of Geophysics, Tehran, 14155-6466, Iran.
    Ambient noise surface wave tomography of the Makran subduction zone, south-east Iran: Implications for crustal and uppermost mantle structures2015In: Earthquake Science, ISSN 1674-4519, E-ISSN 1867-8777, Vol. 28, no 4, p. 235-251Article in journal (Refereed)
    Abstract [en]

    Seismic ambient noise of surface wave tomography was applied to estimate Rayleigh wave empirical Green’s functions (EGFs) and then to study crust and uppermost mantle structure beneath the Makran region in south-east Iran. 12 months of continuous data from January 2009 through January 2010, recorded at broadband seismic stations, were analyzed. Group velocities of the fundamental mode Rayleigh wave dispersion curves were obtained from the empirical Green’s functions. Multiple-filter analysis was used to plot group velocity variations at periods from 10 to 50 s. Using group velocity dispersion curves, 1-D v S velocity models were calculated between several station pairs. The final results demonstrate significant agreement to known geological and tectonic features. Our tomography maps display low-velocity anomaly with SW-NE trend, comparable with volcanic arc settings of the Makran region which may be attributable to the geometry of Arabian Plate subducting beneath the overriding the Lut block. The northward subducting Arabian Plate is determined by high-velocity anomaly along the Straits of Hormuz. At short periods (<20 s), there is a sharp transition boundary between low- and high-velocity transition zone with the NW trending at the western edge of Makran which is attributable to the Minab fault system.

  • 1564.
    Abdi Ali, Dusit
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Arts, Department of Cultural Anthropology and Ethnology, Ethnology.
    Material och Smak: Tingens betydelse i skapandet av ett hem och identitet2014Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesis
  • 1565.
    Abdi Ali, Dusit
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Arts, Department of Cultural Anthropology and Ethnology.
    The bright hopes and desoluted dream of Ethiopian women: A study of circular migration to middle east and the gulf states2018Independent thesis Advanced level (degree of Master (Two Years)), 30 credits / 45 HE creditsStudent thesis
    Abstract [en]

    Migration and re-migration of economically and socially marginalized Ethiopian women and girls has become a phenomenon. Based on interviews with 12 Ethiopian migrant women returned from the Middle East and the Gulf States, the primary aim of this thesis is to describe and study Ethiopian women migrants’ circular migration to the Middle East. I will mainly focus on how social dynamics in the family, gender relations and economic circumstances are intricate. The process of women’s migration and how the expectations of the family can be gender differentiated are discussed. Further, the migrant women’s power relation when class and ethnicity determine their position is discussed. Relations with the sending family and the issues related to the women who return, as well as problems affecting them at home and in the destination countries, are looked at. Various and complex issues of migration and the women’s roles are discussed with reference to the women’s experiences. Migration provides women with opportunities for social and economic mobility but can also subject them to ethnic discrimination, exploitation, and abuse. The movement is generally seen as voluntary labor migration and it has placed them in a vulnerable position both at home and abroad. Their migration is interconnected to the economic need but also the responsibilities they have towards their family and kin.

  • 1566.
    Abdi, Amir
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Geophysics.
    Re-processing of reflection seismic data from line V2 of the HIRE Seismic Reflection Survey in the Suurikuusikko mining and exploration area, northern Finland2011Independent thesis Advanced level (degree of Master (Two Years)), 30 credits / 45 HE creditsStudent thesis
    Abstract [en]

    The Suurikuusikko gold deposit is located in northern Finland; it is the largest known gold resource in northern Europe. The acquired high resolution reflection seismic data along the c.30 km long profile V2 of the HIRE reflection survey in the Surrikuusikko gold mining and exploration area have been re-processed. A 15.4 ton Geosvip was used as the source, with a receiver spacing of 12.5 m and source spacing of 25 or 50 m. It was aimed to obtain more detailed structural information of the upper 5 – 6 km crust, and to study the seismic response of the important geological and tectonic structures (e.g. Suasselkä PG fault) along the line V2. The line V2 runs from south to north; in the north, it cuts the mafic graphitic tuffic rocks, which are buried under a layer of tholeiite. It is almost perpendicular to the surface trace of the Suasselkä PG fault in the north. The obtained seismic image showed significant improvements compared with the previous work. The seismic response of the major rock units generated strong reflections, and they can be traced down to at least 3 km depth; the reflections correlate well with the surface geology. The moderately dipping reflections from the PG fault are clearly imaged; the dip direction of the fault is towards the SE with a dip of about 50o, possibly decreasing with depth down to about 35o, the fault can be traced down to about 3 km depth. The reverse movement of the fault most probably caused the neighboring sub-horizontal layers to be folded and generated a duplex structure. The dip direction of the major structures in the southern parts is towards NE; this together with the mentioned information about the fault, can be utilized in order to define the major geological structures and most importantly the tectonic evolution of the area; such information can be used in many crucial aspects such as prediction of the future movements of the bedrock and discovery of new resources.

  • 1567.
    Abdi, Amir
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences.
    Heinonen, Suvi
    Juhlin, Christopher
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Geophysics.
    Karinen, Tuomo
    Constraints on the geometry of the Suasselka post-glacial fault, northern Finland, based on reflection seismic imaging2015In: Tectonophysics, ISSN 0040-1951, E-ISSN 1879-3266, Vol. 649, p. 130-138Article in journal (Refereed)
    Abstract [en]

    Unloading of the ice during the last glacial period in northern Fennoscandia is believed to have generated major faulting. These faults, often referred to as post-glacial faults, typically have clear surface exposures, but their geometry at depth is poorly known. In order to better understand the geometry at depth of the Suasselka post-glacial fault in Finland, three high resolution 2D reflection seismic profiles over the fault were reprocessed. Their total profile length is about 60 km and they were acquired as part of a major effort in Finland to map the uppermost crust in mining areas. The reprocessing led to significantly improved images that could be used to map the fault at depth. Two approximately N-S striking profiles and one E-W striking profile were reprocessed. The different azimuths and the crooked nature of the profiles allowed the fault geometry to be relatively well constrained. Clear reflections from the fault, dipping towards the SE, can be traced from the shallow subsurface down to about 3 km. The strike and dip of two sets of dipping reflections in the stacked data along with geometrical constraints and cross-dip analysis give a consistent dip of about 35-45 degrees towards the SE for the fault. The strike and dip vary from N55E with a dip of 35 degrees in the east to a strike of N48E with a dip of 45 degrees in the west. Existence of the two sets of reflections indicates that the fault surface is non-planar. Aside from allowing the geometry of the fault to be determined, the seismic data show a complex reflectivity pattern in the area and indications of both reverse and normal movement along fault planes with similar orientation to the Suasselka post-glacial fault. These images can be used as a basis for better characterizing the 3D geology of the area.

  • 1568.
    Abdi, Hafsa
    Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Pharmacy, Department of Pharmaceutical Biosciences.
    Finns det någon koppling mellan Alzheimers sjukdom och Diabetes Mellitus?2014Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Alzheimers sjukdom är en neurodegenerativ sjukdom vars orsak är okänd, kännetecknas av en gradvis försämring av kognitiva funktioner. Alzheimers sjukdom och Diabetes Mellitus har flera gemensamma patofysiologiska samband, bland annat insulinresistens. Försämrad insulinsignalering kan leda till kognitiv funktionsförsämring, som i sin tur kan leda till Alzheimers sjukdom. Båda insulin och amyloid-β metaboliseras av insulinnedbrytande enzym (IDE), defekt i IDE kan delvis orsaka amyloid-β ansamlingar. Syftet med detta arbete är att undersöka om försämrad insulinsignalering kan leda till kognitiv försämring och påskynda utvecklingen av Alzheimers sjukdom.

    Jag har gjort en systematisk litteraturöversikt för att undersöka detta. Det är större risk att drabbas av Alzheimers sjukdom om man har Diabetes Mellitus. Man såg ett samband mellan försämrad insulinsignalering och försämrad kognitiv funktion. Förhöjda glukosnivåer var förenade med kognitiv försämring, medan nedsatt glukosnivå inte hade någon betydelse vid kognitiv försämring. Dessutom påskyndar en hög glukosnivå omvandlingen från MCI (mild kognitivs vikt) till Alzheimers sjukdom. Trots detta resultat krävs det mer forskning inom området eftersom olika metoder användes på de olika studierna vilket kan ge ett falskt samband.

  • 1569.
    Abdi, Ikran
    Uppsala University, Humanistisk-samhällsvetenskapliga vetenskapsområdet, Faculty of Social Sciences, Department of Economics.
    Does equity volatility affect the corporate investment level?2007Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    The paper studies the relation between valuation and corporate investment level. It provides an insight to the q-model and its implications for investment level. By acknowledge the q-model’s empirical shortcomings it questions whether adjustments for volatility will strengthen the q-model empirically. It argues: as volatility is a proxy for risk, stock market volatility would be related to firm behaviour and investment decisions.

  • 1570. Abdi-Jalebi, Mojtaba
    et al.
    Andaji-Garmaroudi, Zahra
    Cacovich, Stefania
    Stavrakas, Camille
    Philippe, Bertrand
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and Condensed Matter Physics.
    Richter, Johannes M.
    Alsari, Mejd
    Booker, Edward P.
    Hutter, Eline M.
    Pearson, Andrew J.
    Lilliu, Samuele
    Savenije, Tom J.
    Rensmo, Håkan
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and Condensed Matter Physics.
    Divitini, Giorgio
    Ducati, Caterina
    Friend, Richard H.
    Stranks, Samuel D.
    Maximizing and stabilizing luminescence from halide perovskites with potassium passivation2018In: Nature, ISSN 0028-0836, E-ISSN 1476-4687, Vol. 555, p. 497-501Article in journal (Refereed)
    Abstract [en]

    Metal halide perovskites are of great interest for various high-performance optoelectronic applications. The ability to tune the perovskite bandgap continuously by modifying the chemical composition opens up applications for perovskites as coloured emitters, in building-integrated photovoltaics, and as components of tandem photovoltaics to increase the power conversion efficiency. Nevertheless, performance is limited by non-radiative losses, with luminescence yields in state-of-the-art perovskite solar cells still far from 100 per cent under standard solar illumination conditions. Furthermore, in mixed halide perovskite systems designed for continuous bandgap tunability2 (bandgaps of approximately 1.7 to 1.9 electronvolts), photoinduced ion segregation leads to bandgap instabilities. Here we demonstrate substantial mitigation of both non-radiative losses and photoinduced ion migration in perovskite films and interfaces by decorating the surfaces and grain boundaries with passivating potassium halide layers. We demonstrate external photoluminescence quantum yields of 66 per cent, which translate to internal yields that exceed 95 per cent. The high luminescence yields are achieved while maintaining high mobilities of more than 40 square centimetres per volt per second, providing the elusive combination of both high luminescence and excellent charge transport. When interfaced with electrodes in a solar cell device stack, the external luminescence yield—a quantity that must be maximized to obtain high efficiency—remains as high as 15 per cent, indicating very clean interfaces. We also demonstrate the inhibition of transient photoinduced ion-migration processes across a wide range of mixed halide perovskite bandgaps in materials that exhibit bandgap instabilities when unpassivated. We validate these results in fully operating solar cells. Our work represents an important advance in the construction of tunable metal halide perovskite films and interfaces that can approach the efficiency limits in tandem solar cells, coloured-light-emitting diodes and other optoelectronic applications.

  • 1571.
    Abdi-Jalebi, Mojtaba
    et al.
    Univ Cambridge, Dept Phys, Cavendish Lab, JJ Thomson Ave, Cambridge, England.
    Pazoki, Meysam
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
    Philippe, Bertrand
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and Condensed Matter Physics.
    Dar, M. Ibrahim
    Ecole Polytech Fed Lausanne, Inst Chem Sci & Engn, Lab Photon & Interfaces, Lausanne, Switzerland.
    Alsari, Mejd
    Univ Cambridge, Dept Phys, Cavendish Lab, JJ Thomson Ave, Cambridge, England.
    Sadhanala, Aditya
    Univ Cambridge, Dept Phys, Cavendish Lab, JJ Thomson Ave, Cambridge, England.
    Diyitini, Giorgio
    Univ Cambridge, Dept Mat Sci & Met, Charles Babbage Rd, Cambridge, England.
    Imani, Roghayeh
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Structural Chemistry.
    Lilliu, Samuele
    Univ Sheffield, Dept Phys & Astron, Sheffield, S Yorkshire, England; UAE Ctr Crystallog, Dubai, U Arab Emirates.
    Kullgren, Jolla
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Structural Chemistry.
    Rensmo, Håkan
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and Condensed Matter Physics.
    Gratzel, Michael
    Ecole Polytech Fed Lausanne, Inst Chem Sci & Engn, Lab Photon & Interfaces, Lausanne, Switzerland.
    Friend, Richard H.
    Univ Cambridge, Dept Phys, Cavendish Lab, JJ Thomson Ave, Cambridge, England.
    Dedoping of Lead Halide Perovskites Incorporating Monovalent Cations2018In: ACS Nano, ISSN 1936-0851, E-ISSN 1936-086X, Vol. 12, no 7, p. 7301-7311Article in journal (Refereed)
    Abstract [en]

    We report significant improvements in the optoelectronic properties of lead halide perovskites with the addition of monovalent ions with ionic radii close to Pb2+. We investigate the chemical distribution and electronic structure of solution processed CH3NH3PbI3 perovskite structures containing Na+, Cu+, and Ag+, which are lower valence metal ions than Pb2+ but have similar ionic radii. Synchrotron X-ray diffraction reveals a pronounced shift in the main perovskite peaks for the monovalent cation-based films, suggesting incorporation of these cations into the perovskite lattice as well as a preferential crystal growth in Ag+ containing perovskite structures. Furthermore, the synchrotron X-ray photoelectron measurements show a significant change in the valence band position for Cu- and Ag-doped films, although the perovskite bandgap remains the same, indicating a shift in the Fermi level position toward the middle of the bandgap. Such a shift infers that incorporation of these monovalent cations dedope the n-type perovskite films when formed without added cations. This dedoping effect leads to cleaner bandgaps as reflected by the lower energetic disorder in the monovalent cation-doped perovskite thin films as compared to pristine films. We also find that in contrast to Ag+ and Cu+, Na+ locates mainly at the grain boundaries and surfaces. Our theoretical calculations confirm the observed shifts in X-ray diffraction peaks and Fermi level as well as absence of intrabandgap states upon energetically favorable doping of perovskite lattice by the monovalent cations. We also model a significant change in the local structure, chemical bonding of metal-halide, and the electronic structure in the doped perovskites. In summary, our work highlights the local chemistry and influence of monovalent cation dopants on crystallization and the electronic structure in the doped perovskite thin films.

  • 1572. Abdillahi, Hamda A
    et al.
    Hassan, Khadra A
    Kiruja, Jonah
    Osman, Fatumo
    Egal, Jama A
    Klingberg-Allvin, Marie
    Erlandsson, Kerstin
    A mixed-methods study of maternal near miss and death after emergency cesarean delivery at a referral hospital in Somaliland.2017In: International Journal of Gynecology & Obstetrics, ISSN 0020-7292, E-ISSN 1879-3479, Vol. 138, no 1, p. 119-124Article in journal (Refereed)
    Abstract [en]

    OBJECTIVE: To explore maternal near miss and death after emergency cesarean delivery in Somaliland, including the impact of the prerequisite for family consent.

    METHODS: A facility-based, mixed-methods study was conducted to assess all maternal near misses and deaths recorded at a referral hospital that provided services to women from all regions of Somaliland. The data sources comprised a quantitative prospective cross-sectional study using the WHO near-miss tool (performed from August 1 to December 31, 2015) and qualitative interviews with 17 healthcare providers working at the referral hospital who were in direct contact with the women in labor (performed from January 15 to March 15, 2015).

    RESULTS: Of the 138 maternal near misses and deaths recorded, 50 (36%) were associated with emergency cesarean delivery. The most frequent maternal complication was severe pre-eclampsia (n=17; 34%), and the most frequent underlying causes were hypertensive disorders (n=31; 62%) and obstetric hemorrhage (n=15; 30%). Healthcare providers were often prevented from performing emergency cesarean delivery until the required consent had been received from the woman's extended family.

    CONCLUSION: Maternity care in Somaliland must be improved, and the issue of legal authority for consent examined, to ensure both safe and timely provision of emergency cesarean delivery.

  • 1573.
    Abdillahi, Suado M.
    et al.
    Lund Univ, Div Infect Med, Dept Clin Sci, Tornavagen 10, S-22184 Lund, Sweden.
    Maass, Tobias
    Univ Cologne, Fac Med, Ctr Biochem, Ctr Mol Med Cologne, D-50931 Cologne, Germany.
    Kasetty, Gopinath
    Lund Univ, Div Resp Med & Allergol, Dept Clin Sci, S-22184 Lund, Sweden.
    Strömstedt, Adam A.
    Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Pharmacy, Department of Medicinal Chemistry, Farmakognosi.
    Baumgarten, Maria
    Lund Univ, Div Infect Med, Dept Clin Sci, Tornavagen 10, S-22184 Lund, Sweden.
    Tati, Ramesh
    Lund Univ, Div Infect Med, Dept Clin Sci, Tornavagen 10, S-22184 Lund, Sweden.
    Nordin, Sara L.
    Lund Univ, Div Infect Med, Dept Clin Sci, Tornavagen 10, S-22184 Lund, Sweden.
    Walse, Björn
    Sarom Biostruct AB, S-22363 Lund, Sweden.
    Wagener, Raimund
    Univ Cologne, Fac Med, Ctr Biochem, Ctr Mol Med Cologne, D-50931 Cologne, Germany.
    Schmidtchen, Artur
    Lund Univ, Div Dermatol & Venereol, Dept Clin Sci, S-22184 Lund, Sweden;Univ Copenhagen, Bispebjerg Hosp, Dept Biomed Sci, Copenhagen Wound Healing Ctr, DK-2400 Copenhagen, Denmark.
    Mörgelin, Matthias
    Lund Univ, Div Infect Med, Dept Clin Sci, Tornavagen 10, S-22184 Lund, Sweden;Colzyx AB, S-22381 Lund, Sweden.
    Collagen VI Contains Multiple Host Defense Peptides with Potent In Vivo Activity2018In: Journal of Immunology, ISSN 0022-1767, E-ISSN 1550-6606, Vol. 201, no 3, p. 1007-1020Article in journal (Refereed)
    Abstract [en]

    Collagen VI is a ubiquitous extracellular matrix component that forms extensive microfibrillar networks in most connective tissues. In this study, we describe for the first time, to our knowledge, that the collagen VI von Willebrand factor type A like domains exhibit a broad-spectrum antimicrobial activity against Gram-positive and Gram-negative bacteria in human skin infections in vivo. In silico sequence and structural analysis of VWA domains revealed that they contain cationic and amphipathic peptide sequence motifs, which might explain the antimicrobial nature of collagen VI. In vitro and in vivo studies show that these peptides exhibited significant antibacterial activity against Staphylococcus aureus, Escherichia coli, and Pseudomonas aeruginosa through membrane disruption. Our findings shed new light on the role of collagen VI derived peptides in innate host defense and provide templates for development of peptide-based antibacterial therapies.

  • 1574. Abdin, Amir
    et al.
    Feyzabi, Kaveh
    Hellman, Oskar
    Nordström, Henrietta
    Rasa, Dilman
    Thaung Tolförs, Gustav
    Öqvist, Per-Olof
    Methods to create compressive stress in high strength steel components2018Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [en]

    Residual compressive stresses can be used to increase the lifetime of parts under cyclic stress as they negate the applied tensile stresses that cause crack initiation and propagation in the material. The goal of this project was to investigate methods to induce stresses, their advantages and disadvantages as well as depth and magnitude of induced stresses, and also to find methods of analyzing the induced residual stresses. This was done on behalf of Epiroc Drilling Tools AB in order for them to induce stresses on the insides of their long, narrow and hollow rods, where stress induction is difficult. Shot peening was used as a reference as that is the method currently in use by the company. The results show that the two most promising methods are cavitation peening and laser shock peening; two relatively new methods with large magnitudes and depth of induced stress as well as a great capability of inducing stresses on the hard-to-reach insides of the rods. Ultrasonic needle peening, ultrasonic shot peening as well as induction hardening, cryogenic treatment and friction stir processing were also investigated. Methods of analyzing the stresses include X-ray diffraction and slitting, hole drilling and ultrasonic methods.

  • 1575. Abdissa, Negera
    et al.
    Fangfang, Pan
    Gruhonjic, Amra
    Gräfenstein, Jürgen
    Fitzpatrick, Paul A
    Landberg, Göran
    Rissanen, Kari
    Yenesew, Abiy
    Erdelyi, Mate
    Naphthalene Derivatives from the Roots of Pentas parvifolia and Pentas bussei.2016In: Journal of natural products (Print), ISSN 0163-3864, E-ISSN 1520-6025, Vol. 79, no 9, p. 2181-2187Article in journal (Refereed)
    Abstract [en]

    The phytochemical investigation of the CH2Cl2/MeOH (1:1) extract of the roots of Pentas parvifolia led to the isolation of three new naphthalenes, parvinaphthols A (1), B (2), and C (3), two known anthraquinones, and five known naphthalene derivatives. Similar investigation of the roots of Pentas bussei afforded a new polycyclic naphthalene, busseihydroquinone E (4), a new 2,2'-binaphthralenyl-1,1'-dione, busseihydroquinone F (5), and five known naphthalenes. All purified metabolites were characterized by NMR and MS data analyses, whereas the absolute configurations of 3 and 4 were determined by single-crystal X-ray diffraction studies. The E-geometry of compound 5 was supported by DFT-based chemical shift calculations. Compounds 2-4 showed marginal cytotoxicity against the MDA-MB-231 human triple-negative breast cancer cell line with IC50 values ranging from 62.3 to 129.6 μM.

  • 1576. Abdissa, Negera
    et al.
    Induli, Martha
    Fitzpatrick, Paul
    Alao, John Patrick
    Sunnerhagen, Per
    Landberg, Göran
    Yenesew, Abiy
    Erdelyi, Mate
    Cytotoxic quinones from the roots of Aloe dawei.2014In: Molecules, ISSN 1420-3049, E-ISSN 1420-3049, Vol. 19, no 3, p. 3264-3273Article in journal (Refereed)
    Abstract [en]

    Seven naphthoquinones and nine anthraquinones were isolated from the roots of Aloe dawei by chromatographic separation. The purified metabolites were identified by NMR and MS analyses. Out of the sixteen quinones, 6-hydroxy-3,5-dimethoxy-2-methyl-1,4-naphthoquinone is a new compound. Two of the isolates, 5,8-dihydroxy-3-methoxy-2-methylnaphthalene-1,4-dione and 1-hydroxy-8-methoxy-3-methylanthraquinone showed high cytotoxic activity (IC₅₀ 1.15 and 4.85 µM) on MCF-7 breast cancer cells, whereas the others showed moderate to low cytotoxic activity against MDA-MB-231 (ER Negative) and MCF-7 (ER Positive) cancer cells.

  • 1577.
    Abdlbari, Abdulbari
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Informatics and Media.
    Product registration in e-commerce for small and medium companies (SMEs): Usability aspects2015Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
    Abstract [en]

    People these days are able to buy almost anything online. With a continuously increased E-commerce, small and medium sized companies (SMEs) feel obligated to enter the competitive E-commerce market. Moreover, for small companies with little or no experience in e-commerce it could become overwhelming to get a web-shop up and running. One important tasks in managing a web-shop is to register products into the system. This must be easy and efficient. The focus of this thesis is to answer the question "How can user-centered design principles improve productregistration, particularly in the SME context?". At the start of this study, surveys and interviews were conducted, which showed that product registration is very time consuming at the moment. User tests were conducted to measure the efficiency and the general usability of a system maintaining over 100 active web-shops. Based on the results of the first iteration of the user test conducted, design changes were proposed and implemented. A second iteration of the user test showed improved efficiency and substantially less errors. The most important new design elements were related to navigation, workflow and adjustment of input fields to the data sources. Thus it has been shown that the threshold for SME web-shops to go online can be lowered by a systematic application of user-centered design of the user interface.

  • 1578.
    Abdo, Johanna
    et al.
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Business Studies.
    Gustavsson, Camilla
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Business Studies.
    Controllerns funktion en studie av business controllerns arbetsuppgifter2005Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    Undersökningen visar att en business controller i större utsträckning arbetar med analys och omvärldsbevakning än tidigare, vilket kräver att de tar hänsyn till både intern och extern information. Samtidigt har de inte helt övergivit redovisningsrelaterade arbetsuppgifter eftersom att det är en viktig del av den ekonomiska verksamheten, som business controllern behöver en övergripande förståelse för. En aspekt som påverkar business controllerns arbetsuppgifter i stor utsträckning är personalansvar.

  • 1579.
    Abdo, Johanna
    et al.
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Business Studies.
    Gustavsson, Camilla
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Social Sciences, Department of Business Studies.
    Hur ser revisorn på sitt oberoende?: En caseundersökning utifrån analysmodellen2006Independent thesis Advanced level (degree of Master (One Year)), 10 credits / 15 HE creditsStudent thesis
    Abstract [sv]

    En förutsättning för att revisorer ska kunna säkra tilltron till de granskande företagen är att de uppfattas som oberoende. En av anledningarna till att det är intressant att undersöka revisorns oberoende är att analysmodellen, som är ett verktyg för att säkra detta, lagstadgades för fyra år sedan, och vi förutsätter att den nu har förankrats bland revisorerna i Sverige. Frågor som tittas närmare på i undersökningen är om det är möjligt för en revisor att uppehålla sitt oberoende samtidigt som denne uppfyller kundernas krav, och hur revisorerna tolkar regleringen kring oberoende i sitt arbete. Undersökningen baseras på analysmodellens fem huvudsakliga oberoendehot. Studien genomförs genom att presentera ett case för godkända och auktoriserade revisorer, som efterföljs av en diskussion.

    Resultaten av undersökningen visar att revisorernas verklighet skiljer sig från befintliga regelverk i vissa hänseenden. I många situationer är en revisor mer överseende än vad lagens riktlinjer är. I slutändan är det upp till revisorn själv att avgöra vart gränserna går för revisorns oberoende, vilket kan ifrågasätta analysmodellens existens.

  • 1580.
    Abdollahi, Somayeh
    et al.
    Univ Tehran, Inst Geophys, POB 14155-6466, Tehran, Iran.
    Ardestani, Vahid Ebrahimzadeh
    Univ Tehran, Inst Geophys, POB 14155-6466, Tehran, Iran.
    Zeyen, Hermann
    Univ Paris Saclay, Univ Paris Sud, CNRS, GEOPS, F-91405 Orsay, France.
    Shomali, Zaher Hossein
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Geophysics. Univ Tehran, Inst Geophys, POB 14155-6466, Tehran, Iran.
    Crustal and upper mantle structures of Makran subduction zone, SE Iran by combined surface wave velocity analysis and gravity modeling2018In: Tectonophysics, ISSN 0040-1951, E-ISSN 1879-3266, Vol. 747, p. 191-210Article in journal (Refereed)
    Abstract [en]

    The inversion of Rayleigh wave group velocity dispersion curves is challenging, because it is non-linear and multimodal. In this study, we develop and test a new Rayleigh wave dispersion curve inversion scheme using the Shuffled Complex Evolution (SCE) algorithm. Incorporating this optimization algorithm into the inverse procedure not only can effectively locate the promising areas in the solution space for a global minimum but also avoids its wandering near the global minimum in the final stage of search. In addition, our approach differs from others in the model parameterization: Instead of subdividing the model into a large number of thin layers, we invert for thickness, velocities and densities and their vertical gradients of four layers, sediments, upper-crust, lower-crust and upper mantle. The proposed inverse procedure is applied to non-linear inversion of fundamental mode Rayleigh wave group dispersion curves for shear and compressional wave velocities. At first, to determine the efficiency and stability of the SCE method, two noise-free and two noisy synthetic data sets are inverted. Then real data for Makran region in SE Iran are inverted to examine the usage and robustness of the proposed approach on real surface wave data. In a second step, we applied 3D Gravity Modeling based on surface wave analysis results to obtain the density structure and thickness of each layer. The reason for using both types of data sets, is that gravity anomaly has a bad vertical resolution and surface wave group velocities are good for placing layer limits at depth, but they are not very sensitive to densities. Therefore, using gravity data increases the overall resolution of density distribution. In a final step, we used again the SCE method to invert the fundamental mode Rayleigh wave group dispersion curves based on the gravity results. Gravity results like thicknesses and sediment densities have been used to constrain the limit of search space in the SCE method. Results show a high shear and compressional velocity under the Gulf of Oman which reduce to the North of the Makran region. The Moho depth of the Oman Gulf is about 18-28 km and it increases to 46-48 km under the Taftan-Bazman volcanic-arc. The density image shows an average crustal density with maximum values under the Gulf of Oman decreasing northward to the Makran.

  • 1581.
    Abdou, Elhassan M
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology.
    Visual Planning and Verification of Deep Brain Stimulation Interventions2011Independent thesis Advanced level (degree of Master (Two Years)), 30 credits / 45 HE creditsStudent thesis
  • 1582. Abdou, Y.
    et al.
    Becker, K. -H
    Berdermann, J.
    Bissok, M.
    Bohm, C.
    Boeser, S.
    Bothe, M.
    Carson, M.
    Descamps, F.
    Fischer-Wolfarth, J. -H
    Gustafsson, L.
    Hallgren, Allan
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
    Heinen, D.
    Helbing, K.
    Heller, R.
    Hundertmark, S.
    Karg, T.
    Krieger, K.
    Laihem, K.
    Meures, T.
    Nahnhauer, R.
    Naumann, U.
    Oberson, F.
    Paul, L.
    Pohl, M.
    Price, B.
    Ribordy, M.
    Ryckbosch, D.
    Schunck, M.
    Semburg, B.
    Stegmaier, J.
    Sulanke, K. -H
    Tosi, D.
    Vandenbroucke, J.
    Wiebusch, C.
    Design and performance of the South Pole Acoustic Test Setup2012In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, ISSN 0168-9002, E-ISSN 1872-9576, Vol. 683, p. 78-90Article in journal (Refereed)
    Abstract [en]

    The South Pole Acoustic Test Setup (SPATS) was built to evaluate the acoustic characteristics of the South Pole ice in the 10-100 kHz frequency range, for the purpose of assessing the feasibility of an acoustic neutrino detection array at the South Pole. The SPATS hardware consists of four vertical strings deployed in the upper 500 m of the South Pole ice cap. The strings form a trapezoidal array with a maximum baseline of 543 m. Each string has seven stages equipped with one transmitter and one sensor module (glaciophone). Sound is detected or generated by piezoelectric ceramic elements inside the modules. Analogue signals are sent to the surface on electric cables where they are digitized by a PC-based data acquisition system. The data from all strings are collected on a central computer in the IceCube Laboratory from where they are sent to a central data storage facility via a satellite link or stored locally on tape. A technical overview of SPATS and its performance is presented.

  • 1583.
    Abdsaleh, S
    et al.
    Uppsala University, Medicinska vetenskapsområdet, Faculty of Medicine, Department of Oncology, Radiology and Clinical Immunology. Radiologi.
    Azavedo, E
    Lindgren, P G
    Uppsala University, Medicinska vetenskapsområdet, Faculty of Medicine, Department of Oncology, Radiology and Clinical Immunology. Radiololgi.
    Behaviour of the 2.1-mm (14 G) automated biopsy needle in phantoms.2002In: Acta Radiol, ISSN 0284-1851, Vol. 43, no 2, p. 225-9Article in journal (Refereed)
  • 1584.
    Abdsaleh, S
    et al.
    Uppsala University, Medicinska vetenskapsområdet, Faculty of Medicine, Department of Oncology, Radiology and Clinical Immunology. Radiologi.
    Azavedo, E
    Lindgren, P G
    Uppsala University, Medicinska vetenskapsområdet, Faculty of Medicine, Department of Oncology, Radiology and Clinical Immunology. Radiologi.
    Ultrasound-guided large needle core biopsy of the axilla.2004In: Acta Radiol, ISSN 0284-1851, Vol. 45, no 2, p. 193-6Article in journal (Other scientific)
  • 1585.
    Abdsaleh, S
    et al.
    Uppsala University, Medicinska vetenskapsområdet, Faculty of Medicine, Department of Oncology, Radiology and Clinical Immunology.
    Azavedo, E
    Lindgren, PG
    Uppsala University, Medicinska vetenskapsområdet, Faculty of Medicine, Department of Oncology, Radiology and Clinical Immunology.
    Semiautomatic core biopsy. A modified biopsy technique in breast diseases.2003In: Acta Radiol, Vol. 44, p. 47-Article in journal (Refereed)
  • 1586.
    Abdsaleh, Shahin
    Uppsala University, Medicinska vetenskapsområdet, Faculty of Medicine, Department of Oncology, Radiology and Clinical Immunology.
    Core Biopsy of Breast and Axillary Lesions: Technical and Clinical Aspects2006Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    The aims of this work were to image and analyze the needle behavior at automated core biopsy, to investigate the clinical utility of an alternative core biopsy technique using a semiautomated gun in breast and axillary lesions, and also to compare core biopsy with surgical specimens in malignant breast lesions regarding histologic features and hormone receptor expression.

    In two experimental studies, using butter and silicon phantoms, respectively, the needle pass was imaged and its dynamic behavior studied. It was shown that the needle took a curved course in phantoms. It deviated to the same side as where the tip lay, and the degree of the curvature increased with increasing hardness of the phantoms. Our experimental methods can be applied for imaging of needle behavior and thereby improvement of needle configuration.

    In two clinical studies, a semiautomated gun was used for large needle core biopsy of breast and axillary lesions in two series of 145 and 21 patients, respectively. The sensitivity of the method for diagnosis of malignancy was 87% (108/124), and in 37% (31/83) of cases the full length of the needle notch was filled with specimen. No injury to the neurovascular structures of the axillary area was observed. It was concluded that the semiautomated gun can be used as an alternative to the automated gun when the size and location of the lesion render use of the automatic device uncertain or dangerous, e.g., in small breast lesions or lesions located in the axilla.

    In a series of 129 cases of breast cancer, comparison of core biopsy and surgical specimens showed that core biopsy provided enough information on the histologic type and grade of the lesions. Also, there was moderate to high concordance between the two methods for assessment of progesterone receptors and estrogen receptors (Spearman`s kappa 0.67 and 0.89, respectively).

    List of papers
    1. Behaviour of the 2.1-mm (14 G) Automated Biopsy Needle in Phantoms.
    Open this publication in new window or tab >>Behaviour of the 2.1-mm (14 G) Automated Biopsy Needle in Phantoms.
    2002 In: Acta Radiologica, Vol. 43, no 2, p. 225-229Article in journal (Refereed) Published
    Identifiers
    urn:nbn:se:uu:diva-94101 (URN)
    Available from: 2006-03-03 Created: 2006-03-03Bibliographically approved
    2. Semiautomatic Core Biopsy.: A Modified Biopsy Technique in Breast Diseases.
    Open this publication in new window or tab >>Semiautomatic Core Biopsy.: A Modified Biopsy Technique in Breast Diseases.
    2003 In: Acta Radiologica, Vol. 44, no 1, p. 47-51Article in journal (Refereed) Published
    Identifiers
    urn:nbn:se:uu:diva-94102 (URN)
    Available from: 2006-03-03 Created: 2006-03-03Bibliographically approved
    3. Ultrasound-guided Large Needle Core Biopsy of the Axilla.
    Open this publication in new window or tab >>Ultrasound-guided Large Needle Core Biopsy of the Axilla.
    2004 In: Acta Radiologica, Vol. 45, no 2, p. 193-196Article in journal (Refereed) Published
    Identifiers
    urn:nbn:se:uu:diva-94103 (URN)
    Available from: 2006-03-03 Created: 2006-03-03Bibliographically approved
    4. Dynamic Behaviour of Core Biosy Needle:: High-speed Video Imaging of the Needle Course in Silicon Phantoms.
    Open this publication in new window or tab >>Dynamic Behaviour of Core Biosy Needle:: High-speed Video Imaging of the Needle Course in Silicon Phantoms.
    Show others...
    Manuscript (Other academic)
    Identifiers
    urn:nbn:se:uu:diva-94104 (URN)
    Available from: 2006-03-03 Created: 2006-03-03 Last updated: 2010-01-13Bibliographically approved
    5. Comparison of Core Needle Biopsy and Surgical Specimens in Malignant Breast Lesions Regarding Histologic Features and Hormone Receptor Expression.
    Open this publication in new window or tab >>Comparison of Core Needle Biopsy and Surgical Specimens in Malignant Breast Lesions Regarding Histologic Features and Hormone Receptor Expression.
    Show others...
    (English)Manuscript (Other academic)
    Identifiers
    urn:nbn:se:uu:diva-94105 (URN)
    Available from: 2006-03-03 Created: 2006-03-03 Last updated: 2010-02-03Bibliographically approved
  • 1587.
    Abdsaleh, Shahin
    et al.
    Uppsala University, Medicinska vetenskapsområdet, Faculty of Medicine, Department of Oncology, Radiology and Clinical Immunology.
    Astrom, Gunnar
    Uppsala University, Medicinska vetenskapsområdet, Faculty of Medicine, Department of Oncology, Radiology and Clinical Immunology.
    Brenning, Gunilla
    Department of Medical Sciences.
    Ahlstrom, Håkan
    Uppsala University, Medicinska vetenskapsområdet, Faculty of Medicine, Department of Oncology, Radiology and Clinical Immunology.
    MR Imaging in Diagnosis of Primary Lymphedema.1996In: 1996 Scientific Program RSNA, p. 419-Article, book review (Other scientific)
  • 1588.
    Abdsaleh, Shahin
    et al.
    Uppsala University, Medicinska vetenskapsområdet, Faculty of Medicine, Department of Oncology, Radiology and Clinical Immunology.
    Azavedo, E
    Lindgren, PG
    Behaviour of the 2.1-mm (14 G) Automated Biopsy Needle in Phantoms.2002In: Acta Radiologica, Vol. 43, no 2, p. 225-229Article in journal (Refereed)
  • 1589.
    Abdsaleh, Shahin
    et al.
    Uppsala University, Medicinska vetenskapsområdet, Faculty of Medicine, Department of Oncology, Radiology and Clinical Immunology.
    Azavedo, E
    Lindgren, PG
    Semiautomatic Core Biopsy.: A Modified Biopsy Technique in Breast Diseases.2003In: Acta Radiologica, Vol. 44, no 1, p. 47-51Article in journal (Refereed)
  • 1590.
    Abdsaleh, Shahin
    et al.
    Uppsala University, Medicinska vetenskapsområdet, Faculty of Medicine, Department of Oncology, Radiology and Clinical Immunology.
    Azavedo, E
    Lindgren, PG
    Ultrasound-guided Large Needle Core Biopsy of the Axilla.2004In: Acta Radiologica, Vol. 45, no 2, p. 193-196Article in journal (Refereed)
  • 1591.
    Abdsaleh, Shahin
    et al.
    Uppsala University, Medicinska vetenskapsområdet, Faculty of Medicine, Department of Oncology, Radiology and Clinical Immunology.
    Carlsson, T
    Fateh-Alavi, K
    Azavedo, E
    Lindgren, PG
    Dynamic Behaviour of Core Biosy Needle:: High-speed Video Imaging of the Needle Course in Silicon Phantoms.Manuscript (Other academic)
  • 1592.
    Abdsaleh, Shahin
    et al.
    Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Oncology, Radiology and Clinical Immunology.
    Wärnberg, F
    Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Surgical Sciences, Endocrine Surgery.
    Azavedo, E
    Lindgren, PG
    Amini, RM
    Comparison of Core Needle Biopsy and Surgical Specimens in Malignant Breast Lesions Regarding Histologic Features and Hormone Receptor Expression.Manuscript (Other academic)
  • 1593.
    Abdsaleh, Shahin
    et al.
    Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Surgical Sciences. Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Radiology, Oncology and Radiation Science, Radiology.
    Wärnberg, Fredrik
    Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Surgical Sciences, Endocrine Surgery.
    Azavedo, E
    Lindgren, P G
    Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Radiology, Oncology and Radiation Science, Radiology.
    Amini, Rose-Marie
    Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Genetics and Pathology.
    Comparison of core needle biopsy and surgical specimens in malignant breast lesions regarding histological features and hormone receptor expression2008In: Histopathology, ISSN 0309-0167, E-ISSN 1365-2559, Vol. 52, no 6, p. 773-775Article in journal (Refereed)
  • 1594.
    Abdu, Y. A.
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences.
    Annersten, H.
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences.
    Ericsson, T.
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences.
    Hawthorne, F. C.
    High-temperature cation ordering in olivine: an in situ Mossbauer study of synthetic (Mg0.55Fe0.45)(2) SiO42008In: Hyperfine Interactions, ISSN 0304-3843, E-ISSN 1572-9540, Vol. 186, no 1-3, p. 99-103Article in journal (Refereed)
    Abstract [en]

    High- temperature in situ Mossbauer spectroscopy measurements ( 300 950. C) were done on synthetic olivine of composition ( Mg0.55Fe0.45) 2 SiO4 (= Fa45) in order to study the distribution of Fe2+ over the M1 and M2 octahedral sites. The spectra are fit with two doublets, which are assigned to Fe2+ at the M1 ( smaller splitting) and M2 sites. The Fe2+ site- occupancies at M1 and M2, obtained from the Mossbauer relative areas, suggest that Fe2+ has a slight preference for the M1 site at temperatures below similar to 500. C, with a tendency of disordering around this temperature. At higher temperatures, Fe2+ again prefers to occupy the M1 site, where it shows a considerable order at this site up to 750C. At still higher temperatures, the spectra indicated partial reduction of the Fa- component into metallic iron and the resolution of the doublets was severely deteriorated.

  • 1595.
    Abdu, Y.A
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Earth Sciences, Department of Earth Sciences.
    Ericsson, T
    Annersten, H
    ,, Dubrovinkaja, N.A
    Dubrovinski, L
    Gismelseed, A.M.
    Mössbauer study of the metallic phase of Al Kidirate and new Halfa meteorite2002In: Hyperfine Interaction (C), Vol. 5, p. 375-378Article in journal (Refereed)
  • 1596.
    Abdu, Yassir Ahmed Mohamed
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Earth Sciences, Department of Earth Sciences.
    Mössbauer Spectroscopy of Meteoritic and Synthetic Fe-Ni Alloys2004Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    This thesis reports on the results of investigating Fe-containing minerals in meteorites, with focus on Fe-Ni minerals and their magnetic properties, along with some synthetic Fe-Ni analogues. The New Halfa meteorite, which fell in Sudan 1994, has been studied using Mössbauer spectroscopy, X-ray diffraction, and electron microprobe analysis techniques, and classified as an ordinary L-type chondrite of petrologic type 4. Mössbauer spectra of taenite-enriched samples from the metal particles of the New Halfa (L4) and Al Kidirate (H6) meteorites identify the following γ (fcc) Fe-Ni phases: the ferromagnetic atomically ordered taenite (tetrataenite) with ~ 50 at % Ni, the ferromagnetic disordered taenite with ~ 50 at % Ni, the low-Ni (~ 25 at %) paramagnetic taenite (antitaenite). The presence of the superstructure of tetrataenite is confirmed by synchrotron X-ray diffraction.

    Fe-rich γ (fcc) Fe-Ni alloys with compositions Fe79Ni21, Fe76Ni24, and Fe73Ni27, which serve as synthetic analogues of antitaenite, are prepared by mechanical alloying and subsequent annealing at 650 °C. The Mössbauer results indicate that these alloys are inhomogeneous and contain a high moment (HM) ferromagnetic Ni-rich phase (> 30 at % Ni) and a low moment (LM) paramagnetic Fe-rich phase, which orders antiferromagnetically at low temperature. The coexistence of these phases is attributed to phase segregation occurring on short range, probably nanometer scale, consistent with the Fe-Ni phase diagram below 400 °C where there is a miscibility gap associated with a spinodal decomposition in alloys with < 50 at % Ni.

    The combined high field Mössbauer spectroscopy and SQUID magnetometry results on these alloys at room temperature indicate large induced local magnetic moments in the paramagnetic part of the sample, which increases with increasing the Ni content. The results, when compared with the high field Mössbauer results on antitaenite from the metal particle of Al Kidirate and New Halfa meteorites may be used to estimate the Ni content of antitaenite in meteorites.

    High pressure 57Fe Mössbauer spectroscopy measurements up to ~ 41 GPa have been carried out at room temperature using the diamond anvil cell (DAC) technique in order to investigate the magnetic properties of γ (fcc) 57Fe53Ni47 alloy. The results indicate a pressure induced Invar effect at ~ 7 GPa and a non-magnetic or paramagnetic state above 20 GPa, demonstrating the volume dependence of the magnetic moment of γ (fcc) Fe-Ni alloys.

    List of papers
    1. Mössbauer spectroscopy, X-ray diffraction and electron microprobe analysis of the New Halfa meteorite
    Open this publication in new window or tab >>Mössbauer spectroscopy, X-ray diffraction and electron microprobe analysis of the New Halfa meteorite
    1997 In: Meteoritics and Planetary Science, Vol. 32, p. 373-375Article in journal (Refereed) Published
    Identifiers
    urn:nbn:se:uu:diva-91276 (URN)
    Available from: 2004-01-15 Created: 2004-01-15Bibliographically approved
    2. Mössbauer studies on the metallic phases of Al Kidirate and New Halfa Meteorites
    Open this publication in new window or tab >>Mössbauer studies on the metallic phases of Al Kidirate and New Halfa Meteorites
    Show others...
    2002 In: Hyperfine Interactions C, Vol. 5, p. 375-378Article in journal (Refereed) Published
    Identifiers
    urn:nbn:se:uu:diva-91277 (URN)
    Available from: 2004-01-15 Created: 2004-01-15Bibliographically approved
    3. Coexisting antiferromagnetism and ferromagnetism in mechanically alloyed Fe-rich Fe-Ni alloys: Implications regarding the Fe-Ni phase diagram below 400 °C
    Open this publication in new window or tab >>Coexisting antiferromagnetism and ferromagnetism in mechanically alloyed Fe-rich Fe-Ni alloys: Implications regarding the Fe-Ni phase diagram below 400 °C
    2004 (English)In: Journal of Magnetism and Magnetic Materials, ISSN 0304-8853, E-ISSN 1873-4766, Vol. 280, no 2-3, p. 395-403Article in journal (Refereed) Published
    Abstract [en]

    Fe–Ni alloys below the Invar region with compositions Fe100−xNix (x=21, 24, and 27 at%) were prepared by high-energy ball milling technique (mechanical alloying). The as-milled samples, characterized by X-ray diffraction and Mössbauer spectroscopy, contain a mixture of α (BCC) and γ (FCC) phases, whereas the samples annealed at 650°C for 0.5 h show a single γ (FCC) phase displaying a single line Mössbauer spectrum at room temperature (RT). At low temperature, the Mössbauer spectra of annealed Fe76Ni24 and Fe73Ni27 alloys show the existence of a magnetically split pattern together with a broad singlet, which are ascribed to a high-moment ferromagnetic Ni-rich phase and a low-moment Fe-rich phase, respectively. The Fe-rich phase in annealed Fe76Ni24 alloy, which is paramagnetic at RT, undergoes antiferromagnetic ordering at ∼40 K, estimated from the dramatic line broadening of its spectrum, giving rise to a small hyperfine field (e.g. ∼2 T at 6 K). The coexistence of these phases is attributed to phase segregation occurring in these alloys as a result of enhanced atomic diffusion. The stability of these alloys towards martensitic (FCC→BCC) transformation at low temperatures is discussed in connection with the Fe–Ni phase diagram below 400°C.

    National Category
    Natural Sciences
    Identifiers
    urn:nbn:se:uu:diva-91278 (URN)10.1016/j.jmmm.2004.03.036 (DOI)
    Available from: 2004-01-15 Created: 2004-01-15 Last updated: 2017-12-14Bibliographically approved
    4. Field induced local magnetic moments in gamma-fcc Fe-Ni anti-Invar alloys
    Open this publication in new window or tab >>Field induced local magnetic moments in gamma-fcc Fe-Ni anti-Invar alloys
    2004 (English)In: Journal of Magnetism and Magnetic Materials, ISSN 0304-8853, E-ISSN 1873-4766, Vol. 280, p. 243-250Article in journal (Refereed) Published
    Abstract [en]

    Mössbauer spectroscopy in longitudinal external fields (up to 7 T) and SQUID magnetometry (up to 5 T)measurements have been carried out on mechanically alloyed (MA) g (FCC) Fe100xNix (x ¼ 21; 24, and 27 at%) alloysat room temperature. The zero-field M.ossbauer spectra of these alloys show only singlets. The high field M.ossbauerresults indicate that large amounts of the material is in the paramagnetic state, giving rise to two spectral componentswith their effective fields almost linearly depend on the external field, but with slopes that are smaller than unity. The infieldM.ossbauer spectra of the x ¼ 27 at% alloy show an additional component with a hyperfine field of E21 T, whichis attributed to Ni-rich (>30 at% Ni) clusters (domains) of ferromagnetically ordered HM phase that behavessuperparamagnetically at room temperature and shows a non-linear character in the magnetization (M–H) curves atlow fields. This HM phase is also present in the x ¼ 21 and 24 at% samples but with smaller amounts. The resultssuggest induced hyperfine fields and hence induced moments in the paramagnetic components, which increases withincreasing Ni contents. Taenite-enriched samples from the metal particles of two stony meteorites, Al Kidirate (H6)and New Halfa (L4), are also studied by high field M.ossbauer spectroscopy and the results are compared to that ofMA samples.

    Keywords
    Mössbauer spectroscopy; External field; Magnetization; Fe–Ni alloys; Antitaenite
    National Category
    Natural Sciences
    Identifiers
    urn:nbn:se:uu:diva-91279 (URN)
    Available from: 2004-01-15 Created: 2004-01-15 Last updated: 2017-12-14Bibliographically approved
    5. Non-magnetic stainless steels reinvestigated: A small effective field component in external magnetic fields
    Open this publication in new window or tab >>Non-magnetic stainless steels reinvestigated: A small effective field component in external magnetic fields
    2004 (English)In: Hyperfine Interactions, ISSN 0304-3843, E-ISSN 1572-9540, Vol. 156/157, p. 151-155Article in journal (Refereed) Published
    Abstract [en]

    Three standard non-magnetic stainl ess steels of composition (wt%) Fe 70 Cr 19 Ni 11 , Fe 70 Cr 17 Ni 13 and Fe 69 Cr 18 . 5 Ni 10 . 3 Mn 1 . 8 Ti 0 . 4 have been investigated by Mössbauer spectroscopy (5–295 K and in external fields 7 T at room temperature) and ma gnetization measurements (10– 300 K) using a SQUID magnetometer. There are indications of a field induced ferromagnetic inter- action in the samples at room temperature

    Keywords
    stainless steel, external field, field induced ferromagnetism
    National Category
    Natural Sciences
    Identifiers
    urn:nbn:se:uu:diva-91280 (URN)
    Available from: 2004-01-15 Created: 2004-01-15 Last updated: 2017-12-14Bibliographically approved
    6. High pressure Mössbauer studies on fcc Fe53Ni47 alloy
    Open this publication in new window or tab >>High pressure Mössbauer studies on fcc Fe53Ni47 alloy
    2004 (English)In: Hyperfine Interactions, ISSN 0304-3843, E-ISSN 1572-9540, Vol. 156, p. 394-, article id 389Article in journal (Refereed) Published
    National Category
    Natural Sciences
    Identifiers
    urn:nbn:se:uu:diva-91281 (URN)10.1007/978-1-4020-2852-6_59 (DOI)
    Available from: 2004-01-15 Created: 2004-01-15 Last updated: 2017-12-14Bibliographically approved
  • 1597.
    Abdu, Yassir
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences.
    Annersten, Hans
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences.
    Dubrovinsky, Leonid
    Dubrovinskaia, Natalia
    High pressure Mössbauer studies on fcc Fe53Ni47 alloy2004In: Hyperfine Interactions, ISSN 0304-3843, E-ISSN 1572-9540, Vol. 156, p. 394-, article id 389Article in journal (Refereed)
  • 1598.
    Abdu, Yassir
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences.
    Annersten, Hans
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Solid Earth Geology.
    Ericsson, Tore
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences.
    Nordblad, Per
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Field induced local magnetic moments in gamma-fcc Fe-Ni anti-Invar alloys2004In: Journal of Magnetism and Magnetic Materials, ISSN 0304-8853, E-ISSN 1873-4766, Vol. 280, p. 243-250Article in journal (Refereed)
    Abstract [en]

    Mössbauer spectroscopy in longitudinal external fields (up to 7 T) and SQUID magnetometry (up to 5 T)measurements have been carried out on mechanically alloyed (MA) g (FCC) Fe100xNix (x ¼ 21; 24, and 27 at%) alloysat room temperature. The zero-field M.ossbauer spectra of these alloys show only singlets. The high field M.ossbauerresults indicate that large amounts of the material is in the paramagnetic state, giving rise to two spectral componentswith their effective fields almost linearly depend on the external field, but with slopes that are smaller than unity. The infieldM.ossbauer spectra of the x ¼ 27 at% alloy show an additional component with a hyperfine field of E21 T, whichis attributed to Ni-rich (>30 at% Ni) clusters (domains) of ferromagnetically ordered HM phase that behavessuperparamagnetically at room temperature and shows a non-linear character in the magnetization (M–H) curves atlow fields. This HM phase is also present in the x ¼ 21 and 24 at% samples but with smaller amounts. The resultssuggest induced hyperfine fields and hence induced moments in the paramagnetic components, which increases withincreasing Ni contents. Taenite-enriched samples from the metal particles of two stony meteorites, Al Kidirate (H6)and New Halfa (L4), are also studied by high field M.ossbauer spectroscopy and the results are compared to that ofMA samples.

  • 1599.
    Abdu, Yassir
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Earth Sciences, Department of Earth Sciences.
    Ericsson, Tore
    Mössbauer spectroscopy, X-ray diffraction and electron microprobe analysis of the New Halfa meteorite1997In: Meteoritics and Planetary Science, Vol. 32, p. 373-375Article in journal (Refereed)
  • 1600.
    Abdu, Yassir
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences. Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics III.
    Ericsson, Tore
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences. Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics III.
    Annersten, Hans
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences. Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics, Physics III.
    Coexisting antiferromagnetism and ferromagnetism in mechanically alloyed Fe-rich Fe-Ni alloys: Implications regarding the Fe-Ni phase diagram below 400 °C2004In: Journal of Magnetism and Magnetic Materials, ISSN 0304-8853, E-ISSN 1873-4766, Vol. 280, no 2-3, p. 395-403Article in journal (Refereed)
    Abstract [en]

    Fe–Ni alloys below the Invar region with compositions Fe100−xNix (x=21, 24, and 27 at%) were prepared by high-energy ball milling technique (mechanical alloying). The as-milled samples, characterized by X-ray diffraction and Mössbauer spectroscopy, contain a mixture of α (BCC) and γ (FCC) phases, whereas the samples annealed at 650°C for 0.5 h show a single γ (FCC) phase displaying a single line Mössbauer spectrum at room temperature (RT). At low temperature, the Mössbauer spectra of annealed Fe76Ni24 and Fe73Ni27 alloys show the existence of a magnetically split pattern together with a broad singlet, which are ascribed to a high-moment ferromagnetic Ni-rich phase and a low-moment Fe-rich phase, respectively. The Fe-rich phase in annealed Fe76Ni24 alloy, which is paramagnetic at RT, undergoes antiferromagnetic ordering at ∼40 K, estimated from the dramatic line broadening of its spectrum, giving rise to a small hyperfine field (e.g. ∼2 T at 6 K). The coexistence of these phases is attributed to phase segregation occurring in these alloys as a result of enhanced atomic diffusion. The stability of these alloys towards martensitic (FCC→BCC) transformation at low temperatures is discussed in connection with the Fe–Ni phase diagram below 400°C.

29303132333435 1551 - 1600 of 246786
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