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  • 351.
    Wang, YD
    et al.
    Uppsala University, Interfaculty Units, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, The Studsvik Neutron Research Laboratory.
    Peng, RL
    McGreevy, RL
    A novel method for constructing the mean field of grain-orientation-dependent residual stress2001In: PHILOSOPHICAL MAGAZINE LETTERS, ISSN 0950-0839, Vol. 81, no 3, p. 153-163Article in journal (Refereed)
    Abstract [en]

    The heterogeneity of grain-orientation-dependent residual stress (ODRS) in polycrystalline materials has received a great deal of attention in the past few years. This letter describes a novel method, called the spherical harmonics approach (SHA), for ana

  • 352.
    Wang, YD
    et al.
    Uppsala University, Interfaculty Units, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, The Studsvik Neutron Research Laboratory.
    Peng, RL
    McGreevy, RL
    Development of intergranular stress of annealed stainless steel2001In: J. Neutron Research, Vol. 9, p. 331-Article in journal (Refereed)
  • 353.
    Wang, YD
    et al.
    Uppsala University, Interfaculty Units, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, The Studsvik Neutron Research Laboratory.
    Peng, RL
    McGreevy, RL
    On the physical line shape of diffraction peaks constructed by MEM and FT2002In: J. Applied Cryst., Vol. submittedArticle in journal (Refereed)
  • 354.
    Wang, YD
    et al.
    Uppsala University, Interfaculty Units, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, The Studsvik Neutron Research Laboratory.
    Peng, RL
    Zeng, XH
    McGreevy, R
    Stress-orientation distribution function (SODF) - Description, symmetry and determination2000In: ECRS 5: PROCEEDINGS OF THE FIFTH EUROPEAN CONFERENCE ON RESIDUAL STRESSES, TRANS TECH PUBLICATIONS LTD , 2000, Vol. 347-3, p. 66-71Conference paper (Refereed)
    Abstract [en]

    In this paper, a stress-orientation distribution function (SODF) is defined to describe statistically the distribution of the stress state of grains as a function of crystal orientation. Similar to the crystal orientation distribution function (CODF), the

  • 355.
    Wannberg A, Mellergård A, Zetterström P, Delaplane R, Grönros M, Karlsson L-E, McGreevy R L
    Uppsala University, Interfaculty Units, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, The Studsvik Neutron Research Laboratory.
    SLAD: A neutron diffractometer for the study of disordered materials1999In: Journal of Neutron Research, Vol. 8, p. 133-154Article in journal (Refereed)
    Abstract [en]

    The Studsvik Liquid and Amorpous materials Diffractometer (SLAD)is a neutron diffractometer designed for measurements of the structure factor of liquids, glasses and amorphous materials, for total (i.e. Bragg and diffuse) scattering measurements from powd

  • 356.
    Wasse, JC
    et al.
    Uppsala University, Interfaculty Units, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, The Studsvik Neutron Research Laboratory.
    Salmon, PS
    Delaplane, RG
    Structure of molten trivalent metal bromides studied by using neutron diffraction: The systems DyBr3, YBr3, HoBr3 and ErBr32000In: JOURNAL OF PHYSICS-CONDENSED MATTER, ISSN 0953-8984, Vol. 12, no 46, p. 9539-9550Article in journal (Other scientific)
    Abstract [en]

    The structure of the salts MBr3, where M3+ denotes Dy3+, Y3+, Ho3+ or Er3+, was investigated by using neutron diffraction. On heating DyBr3, YBr3 and HoBr3, a phase transition from the FeCl3-type crystal structure to possibly the YCl3-type crystal structu

  • 357. Widdowson, A.
    et al.
    Andersson Sundén, Erik
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.
    Binda, F.
    Cecconello, Marco
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.
    Conroy, Sean
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.
    Dzysiuk, N.
    Ericsson, Göran
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.
    Eriksson, Jacob
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.
    Hellesen, C.
    Hjalmarsson, Anders
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.
    Possnert, Göran
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics. Uppsala University, Disciplinary Domain of Science and Technology, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, Tandem Laboratory.
    Sjöstrand, Henrik
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.
    Skiba, M.
    Weiszflog, Matthias
    Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.
    Zychor, I.
    Deposition of impurity metals during campaigns with the JET ITER-like Wall2019In: Nuclear Materials and Energy, E-ISSN 2352-1791, Vol. 19, p. 218-224Article in journal (Refereed)
    Abstract [en]

    Post mortem analysis shows that mid and high atomic number metallic impurities are present in deposits on JET plasma facing components with the highest amount of Ni and W, and therefore the largest sink, being found at the top of the inner divertor. Sources are defined as "continuous" or "specific", in that "continuous" sources arise from ongoing erosion from plasma facing surfaces and "specific" are linked with specific events which decrease over time until they no longer act as a source. This contribution evaluates the sinks and estimates sources, and the balance gives an indication of the dominating processes. Charge exchange neutral erosion is found to be the main source of nickel, whereas erosion of divertor plasma facing components is the main source of tungsten. Specific sources are shown to have little influence over the global mid- and high-Z impurity concentrations in deposits.

  • 358.
    Wimpory, R.C., P.S. May, N.P. O'Dowd, G.A. Webster, D.J.Smith and E. Kingston
    Uppsala University, Interfaculty Units, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, The Studsvik Neutron Research Laboratory.
    Measurement of Residual Stresses in T-Plate Weldments2003In: J. Strain Analysis, Vol. 38(4), p. 349-365Article in journal (Refereed)
  • 359.
    Winterer, M
    et al.
    Uppsala University, Interfaculty Units, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, The Studsvik Neutron Research Laboratory.
    Delaplane, RG
    McGreevy, RL
    X-ray diffraction, neutron scattering and EXAFS Spectroscopy of monoclinic zirconia: analysis by Rietveld refinement and reverse Monte Carlo simulations2002In: J. Applied Cryst., Vol. submittedArticle in journal (Refereed)
  • 360. Wolpher, Henriette
    et al.
    Johansson, Olof
    Abrahamsson, Maria
    Uppsala University, Disciplinary Domain of Science and Technology, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, Accelerator mass spectrometry group. Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Physical Chemistry.
    Kritikos, Mikael
    Sun, Licheng
    Åkermark, Björn
    A tridentate Ligand for Preparation of Bisterpyridine-like Ruthenium(II) Complexes with an Increased Excited State Lifetime2004In: Inorganic Chemistry Communications, ISSN 1387-7003, E-ISSN 1879-0259, Vol. 7, no 3, p. 337-340Article in journal (Refereed)
    Abstract [en]

    A new tridentate polypyridine ligand, 6-(2-picolyl)-2,2-bipyridine, as well as its homoleptic Ru(II) complex has been prepared. Photophysical studies show a prolonged lifetime of the excited state compared to [Ru(tpy)2]2+, where tpy is 2,2:6,2″-terpyridine.

  • 361.
    Xing, Shan
    et al.
    Chinese Acad Sci, State Key Lab Loess & Quaternary Geol, Shaanxi Key Lab Accelerator Mass Spectrometry Tec, Xian AMS Ctr,Inst Earth Environm, Xian 710061, Peoples R China..
    Hou, Xiaolin
    Chinese Acad Sci, State Key Lab Loess & Quaternary Geol, Shaanxi Key Lab Accelerator Mass Spectrometry Tec, Xian AMS Ctr,Inst Earth Environm, Xian 710061, Peoples R China.;Tech Univ Denmark, Ctr Nucl Technol, Riso Campus, DK-4000 Roskilde, Denmark..
    Aldahan, Ala
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL. United Arab Emirates Univ, Dept Geol, Al Ain, U Arab Emirates..
    Possnert, Göran
    Uppsala University, Disciplinary Domain of Science and Technology, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, Tandem Laboratory.
    Speciation analysis of I-129 in seawater using coprecipitation and accelerator mass spectrometry and its applications2017In: Journal of Radioanalytical and Nuclear Chemistry, ISSN 0236-5731, E-ISSN 1588-2780, Vol. 311, no 1, p. 833-841Article in journal (Refereed)
    Abstract [en]

    Speciation analysis of long-lived I-129 in seawater can provide useful information on the source of water masses. This paper presents an improved method for speciation analysis of I-129 based on coprecipitation of iodide as AgI with Ag2SO3 and AgCl. By adding a small amount of I-127 carrier, the separation efficiency of iodine species and the accuracy and precision of I-129 measurement are remarkably improved. I-129 species in depth profiles of seawater from the Antarctic were analyzed for investigation of water circulation in the Antarctic.

  • 362. Xing, Shan
    et al.
    Hou, Xiaolin
    Aldahan, Ala
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.
    Possnert, Göran
    Uppsala University, Disciplinary Domain of Science and Technology, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, Tandem Laboratory.
    Shi, Keliang
    Yi, Peng
    Zhou, Weijian
    Iodine-129 in Snow and Seawater in the Antarctic: Level and Source2015In: Environmental Science and Technology, ISSN 0013-936X, E-ISSN 1520-5851, Vol. 49, no 11, p. 6691-6700Article in journal (Refereed)
    Abstract [en]

    Anthropogenic I-129 has been released to the environment in different ways and chemical species by human nuclear activities since the 1940s. These sources provide ideal tools to trace the dispersion of volatile pollutants in the atmosphere. Snow and seawater samples collected in Bellingshausen, Amundsen, and Ross Seas in Antarctica in 2011 were analyzed for I-129 and I-127, including organic forms; it was observed that I-129/I-127 atomic ratios in the Antarctic surface seawater ((6.1-13) x 10(-12)) are about 2 orders of magnitude lower than those in the Antarctic snow ((6.8-9.5) x 10(-1)0), but 4-6 times higher than the prenuclear level (1.5 x 10(-12)), indicating a predominantly anthropogenic source of I-129 in the Antarctic environment. The I-129 level in snow in Antarctica is 24 orders of magnitude lower than that in the Northern Hemisphere, but is not significantly higher than that observed in other sites in the Southern Hemisphere. This feature indicates that I-129 in Antarctic snow mainly originates from atmospheric nuclear weapons testing from 1945 to 1980; resuspension and re-emission of the fallout I-129 in the Southern Hemisphere maintains the I-129 level in the Antarctic atmosphere. I-129 directly released to the atmosphere and re-emitted marine discharged I-129 from reprocessing plants in Europe might not significantly disperse to Antarctica.

  • 363.
    Xing, Shan
    et al.
    Chinese Acad Sci, State Key Lab Loess & Quaternary Geol, Shaanxi Key Lab Accelerator Mass Spectrometry Tec, Xian AMS Ctr,Inst Earth Environm, Xian 710061, Shaanxi, Peoples R China..
    Hou, Xiaolin
    Chinese Acad Sci, State Key Lab Loess & Quaternary Geol, Shaanxi Key Lab Accelerator Mass Spectrometry Tec, Xian AMS Ctr,Inst Earth Environm, Xian 710061, Shaanxi, Peoples R China.;Techn Univ Denmark, Ctr Nucl Technol, DK-4000 Roskilde, Denmark..
    Aldahan, Ala
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL. United Arab Emirates Univ, Dept Geol, Al Ain 17511, U Arab Emirates..
    Possnert, Göran
    Uppsala University, Disciplinary Domain of Science and Technology, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, Tandem Laboratory.
    Shi, Keliang
    Techn Univ Denmark, Ctr Nucl Technol, DK-4000 Roskilde, Denmark.;Lanzhou Univ, Sch Nucl Sci & Technol, Lanzhou 73000, Gansu, Peoples R China..
    Yi, Peng
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL. Hohai Univ, Coll Hydrol & Water Resources, Nanjing 210098, Jiangsu, Peoples R China..
    Zhou, Weijian
    Chinese Acad Sci, State Key Lab Loess & Quaternary Geol, Shaanxi Key Lab Accelerator Mass Spectrometry Tec, Xian AMS Ctr,Inst Earth Environm, Xian 710061, Shaanxi, Peoples R China..
    Water Circulation and Marine Environment in the Antarctic Traced by Speciation of I-129 and I-1272017In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 7, article id 7726Article in journal (Refereed)
    Abstract [en]

    Emissions of anthropogenic I-129 from human nuclear activities are now detected in the surface water of the Antarctic seas. Surface seawater samples from the Drake Passage, Bellingshausen, Amundsen, and Ross Seas were analyzed for total I-129 and I-127, as well as for iodide and iodate of these two isotopes. The variability of I-127 and I-129 concentrations and their species (I-127(-)/(IO3-)-I-127, I-129(-)/(IO3-)-I-129) suggest limited environmental impact where ((1.15-3.15) x 10(6) atoms/L for I-129 concentration and (0.61-1.98) x 10(-11) for I-129/I-127 atomic ratios are the lowest ones compared to the other oceans. The iodine distribution patterns provide useful information on surface water transport and mixing that are vital for better understanding of the Southern Oceans effects on the global climate change. The results indicate multiple spatial interactions between the Antarctic Circumpolar Current (ACC) and Antarctic Peninsula Coastal Current (APCC). These interactions happen in restricted circulation pathways that may partly relate to glacial melting and icebergs transport. Biological activity during the warm season should be one of the key factors controlling the reduction of iodate in the coastal water in the Antarctic.

  • 364. YanWu, Lue
    et al.
    ZhaoYan, Gu
    Aldahan, Ala
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.
    HuCai, Zhang
    Possnert, Göran
    Uppsala University, Disciplinary Domain of Science and Technology, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, Tandem Laboratory.
    GuoLiang, Lei
    Be-10 in quartz gravel from the Gobi Desert and evolutionary history of alluvial sedimentation in the Ejina Basin, Inner Mongolia, China2010In: Chinese Science Bulletin, ISSN 1001-6538, E-ISSN 1861-9541, Vol. 55, no 33, p. 3802-3809Article in journal (Refereed)
    Abstract [en]

    Reconstructing the evolutionary history of the Gobi deserts developed from alluvial sediments in arid regions has great significance in unraveling changes in both tectonic activity and climate. However, such work is limited by a lack of suitable dating material preserved in the Gobi Desert, but cosmogenic Be-10 has great potential to date the Gobi deserts. In the present study, Be-10 in quartz gravel from the Gobi deserts of the Ejina Basin in Inner Mongolia of China has been measured to assess exposure ages. Results show that the Gobi Desert in the northern margin of the basin developed 420 ka ago, whereas the Gobi Desert that developed from alluvial plains in the Heihe River drainage basin came about during the last 190 ka. The latter developed gradually northward and eastward to modern terminal lakes of the river. These temporal and spatial variations in the Gobi deserts are a consequence of alluvial processes influenced by Tibetan Plateau uplift and tectonic activities within the Ejina Basin. Possible episodes of Gobi Desert development within the last 420 ka indicate that the advance/retreat of alpine glaciers during glacial/interglacial cycles might have been the dominant factor to influencing the alluvial intensity and water volume in the basin. Intense floods and large water volumes would mainly occur during the short deglacial periods.

  • 365. Yartys, V. A.
    et al.
    Denys, Roman V.
    Uppsala University, Disciplinary Domain of Science and Technology, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, The Studsvik Neutron Research Laboratory.
    Isnard, O.
    Laboratoire de Crystallographie du CNRS.
    Delaplane, Robert G.
    Uppsala University, Disciplinary Domain of Science and Technology, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, The Studsvik Neutron Research Laboratory.
    Svedlindh, Peter
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
    Buschhow, K. H. J.
    Van Der Waals Zeeman Institute, University of Amsterdam.
    Crystal and magnetic structure of TbNiSnD studied by neutron powder diffraction2007In: Journal of Magnetism and Magnetic Materials, ISSN 0304-8853, E-ISSN 1873-4766, Vol. 311, no 2, p. 639-643Article in journal (Refereed)
    Abstract [en]

    The crystal and magnetic structure of TbNiSnD has been studied by neutron powder diffraction. The deuteride crystallizes with the filled TiNiSi type structure (sp. gr. Pnma; a=7.0354(1); b=4.20662(9); c=8.1808(2) Å at 293 K; a=7.008(1); b=4.1954(6); c=8.153(1) Å at 2 K) and is canted ferromagnetic below 10 K. The deuterium atoms occupy the tetrahedral Tb3Ni sites. The Tb atoms carry a magnetic moment of 6.6(1) μB /Tb. They order antiferromagnetically along the a-axis and ferromagnetically along the c-axis. No significant magnetic moment on the Ni atoms has been observed by neutron diffraction. Insertion of deuterium in TbNiSn induces both a change of the magnetic structure and a reduction of the Tb magnitude of the magnetic moment.

  • 366.
    Yartys, VA
    et al.
    Uppsala University, Interfaculty Units, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, The Studsvik Neutron Research Laboratory.
    Denys, RV
    Bulyk, II
    Delaplane, RG
    Hauback, BC
    Powder neutron diffraction study of Nd6Fe13GaD12.3 with a filled Nd6Fe13Si-type structure2000In: JOURNAL OF ALLOYS AND COMPOUNDS, ISSN 0925-8388, Vol. 312, no 1-2, p. 158-164Article in journal (Other scientific)
    Abstract [en]

    Nd6Fe1.3GaD12.3 with a filled Nd6Fe13Si-type structure has been synthesised from the corresponding intermetallic compound at room temperature under a D-2 pressure of 1 bar and characterised by powder X-ray and high-resolution powder neutron diffraction (P

  • 367.
    Yi, Peng
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.
    Aldahan, Ala
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.
    Hansen, V.
    Possnert, Göran
    Uppsala University, Disciplinary Domain of Science and Technology, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, Tandem Laboratory.
    Hou, X. L.
    Iodine Isotopes (I-129 and I-127) in the Baltic Proper, Kattegat, and Skagerrak Basins2011In: Environmental Science and Technology, ISSN 0013-936X, E-ISSN 1520-5851, Vol. 45, no 3, p. 903-909Article in journal (Refereed)
    Abstract [en]

    Radioactive anthropogenic pollution has raised concerns about the present and future environmental status of the semienclosed Baltic Sea. We here study the distribution and inventory of the anthropogenic radioactive I-129 in water depth profiles collected from 16 sites in August 2006 and 19 sites in April 2007 in the Baltic Proper and related Kattegat and Skagerrak basins. The results reveal considerable differences of I-129 concentration in terms Of spatial and temporal variability and expose relatively high concentrations in the deep waters. Variability in the concentration of I-127, stable natural isotope of iodine, seems to follow changes in the seawater salinity, but in oxygen-poor bottom waters sediment diagenetic release may contribute to the concentration of both isotopes in the water body. Inventory estimates show that I-129 in August 2006 (24.2 +/- 15.4 kg) is higher than that in April 2007 (14.4 +/- 8.3 kg) within the southern and central Baltic Proper whereas almost a constant load occurs in the Kattegat Basin. Calculated model inventory shows correspondence to empirical data and provides a guideline for future environmental assessment on the impact of I-129 load in the studied region.

  • 368.
    Yi, Peng
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.
    Aldahan, Ala
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.
    Possnert, Goran
    Uppsala University, Disciplinary Domain of Science and Technology, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, Tandem Laboratory. Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Hou, Xiaolin
    Technical University of Denmark, Risø Campus, Roskilde, Denmark.
    He, Peng
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.
    Biao, Wang
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Population and Conservation Biology.
    Depth profiles of I-129 species in the Bothnian Sea2013In: Journal of Radioanalytical and Nuclear Chemistry, ISSN 0236-5731, E-ISSN 1588-2780, Vol. 295, no 2, p. 1459-1463Article in journal (Refereed)
    Abstract [en]

    The Bothnian Sea which is located between Finland and Sweden represents an important source of fresh water to the Baltic Sea. We here present new data on the radioactive isotope I-129 species from water samples collected in December 2009 at different depths in the Bothnian Sea. Concentrations of I-129(-) (iodide) in the Bothnian Sea range from 14 x 10(8) to 32 x 10(8) atoms/L, while (IO3)-I-129 (-) (iodate) concentrations are relatively low and fluctuating at 1 x 10(8) atoms/L. For nutrients data determined in the same samples as I-129, significant correlations could be found between I-129(-) and total P, NO3-N, SiO3-Si, but rather poor with NH4-N. The correlations suggest comparable source pathway of I-129(-) and nutrient parameters, while the source of NH4-N may be different. The small amounts and negligible change of (IO3)-I-129 (-) indicate prevailing extensive reduction of iodate in the Baltic Sea.

  • 369.
    Yi, Peng
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.
    Aldahan, Ala
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.
    Possnert, Göran
    Uppsala University, Disciplinary Domain of Science and Technology, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, Tandem Laboratory.
    Hou, X. L.
    Hansen, V.
    Wang, B.
    I-127 and I-129 Species and Transformation in the Baltic Proper, Kattegat, and Skagerrak Basins2012In: Environmental Science and Technology, ISSN 0013-936X, E-ISSN 1520-5851, Vol. 46, no 20, p. 10948-10956Article in journal (Refereed)
    Abstract [en]

    Occurrence of anthropogenic I-129 in seawater has provided invaluable information about water circulation and exchange rates, but results on I-129 species (iodide and iodate) are limited and only available for surface water. We here present the first extensive results on I-129 and I-127 species in samples of seawater depth profiles, which were collected in August 2006 and April 2007 in the Skagerrak, Kattegat, and Baltic Proper. The results expose <= 10% annual reduction of iodate as I-129 is transported from the English Channel along the Dutch coast and German Bight into the Skagerrak and Kattegat. The results also suggest strong variability between surface and bottom seawater with respect to the predominant iodine species. Distribution of iodide and iodate of both I-127 and I-129 in the Kattegat mainly reflects water mixing process rather than speciation transformation. In water of the Baltic Proper, high I-127(-)/(IO3-)-I-127 and I-129-/(IO3-)-I-129 values suggest effective reduction of iodate with a maximum rate of 8 x 10(-7) ((IO3-)-I-127) and 6 x 10(-14) ((IO3-)-I-129) (g/m(3).day). The reduction process of iodate seems to be related to decomposition of organic matter and photochemically induced reactions.

  • 370.
    Yi, Peng
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.
    Aldahan, Ala
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.
    Possnert, Göran
    Uppsala University, Disciplinary Domain of Science and Technology, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, Tandem Laboratory. Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
    Hou, X. L.
    He, Peng
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.
    Wang, Biao
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Population and Conservation Biology.
    Seasonal variation of I-129 species in the Baltic Proper2013In: Journal of Radioanalytical and Nuclear Chemistry, ISSN 0236-5731, E-ISSN 1588-2780, Vol. 295, no 3, p. 1797-1801Article in journal (Refereed)
    Abstract [en]

    Iodine speciation plays a significant role in iodine volatilizing into atmosphere from the seas, as well as serving as a biological indicator. Despite this importance, the data on iodine species revealed inconclusive evidence of what factors controlling speciation transformation. We here present new data on profiles of I-129 speciation in the Baltic Proper during November 2009. Along with the two earlier investigations (August 2006 and April 2007), an assessment of seasonal variation of I-129 species is presented. The results show that, due to the anoxic nature of Baltic Proper, presence of (IO3)-I-129 (-) in the Baltic Proper does not follow an obvious seasonal cycle, as the case with I-129(-). Concentrations of I-129(-) in the Baltic Proper exhibit higher values in summer than the other two seasons (spring and winter), which might be associated with degrading of organic matter and release from sediment to water column that is more pronounced during summer. I-129(-) in surface water from the three seasons does not reflect the release function from the reprocessing facilities during the period April 2007 to November 2009. Consequently variability of I-129(-) in surface seawater of the Baltic Proper depends, to some extent, on local physical as well as biochemical conditions.

  • 371.
    Yi, Peng
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.
    Chen, X. G.
    Aldahan, Ala
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.
    Possnert, Göran
    Uppsala University, Disciplinary Domain of Science and Technology, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, Tandem Laboratory.
    Hou, X. L.
    Yu, Z. B.
    Xiong, D. H.
    Wang, Biao
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Population and Conservation Biology.
    Circulation of water masses in the Baltic Proper revealed through iodine isotopes2013In: Applied Geochemistry, ISSN 0883-2927, E-ISSN 1872-9134, Vol. 36, p. 118-124Article in journal (Refereed)
    Abstract [en]

    Tracer technology has been used to understand water circulation in marine systems where the tracer dose is commonly injected into the marine waters through controlled experiments, accidental releases or waste discharges. Anthropogenic discharges of I-129 have been used to trace water circulation in the Arctic and North Atlantic Ocean. Here, I-129, together with I-127, is utilized as a tracer of water pathways and circulation in the Baltic Sea through collection of seawater depth profiles. The results indicate the presence of I-129 signatures which are distinct for each water mass and provide evidence for: (1) inflow water masses through the Drogden Sill that may reach as far as the SW of the Arkona Sea, (2) a portion of North Atlantic water in the bottom of Arkona basin, (3) cyclonic upwelling which breaks through the halocline in a pattern similar to the Baltic haline conveyor belt and (4) more influx of fresher water from the Gulf of Finland and Bothnian Sea in August relative to April. These findings provide advances in labeling and understanding water pathways in the Baltic Sea.

  • 372.
    Yi, Peng
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.
    Chen, X. G.
    Bao, D. X.
    Qian, R. Z.
    Aldahan, Ala
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.
    Tian, F. Y.
    Possnert, Göran
    Uppsala University, Disciplinary Domain of Science and Technology, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, Tandem Laboratory.
    Bryhn, A. C.
    Gu, T. F.
    Hou, X. L.
    He, Peng
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.
    Yu, Z. B.
    Wang, Biao
    Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics.
    Model simulation of inflow water to the Baltic Sea based on I-1292013In: Applied Radiation and Isotopes, ISSN 0969-8043, E-ISSN 1872-9800, Vol. 82, p. 223-231Article in journal (Refereed)
    Abstract [en]

    The semi-enclosed Baltic Sea represents a vital economic and recreational resource for more than 90 million people inhabiting its coasts. Extensive contamination of this sea by a variety of anthropogenic pollutants has raised the concern of the people in the region. Quantifying seawater inflow is crucial for estimating potential environmental risks as well as to find the best remedial strategy. We present here a model to estimate water inflow from the North Sea to the Baltic Sea by utilizing 1291 as a tracer. The results predicted inflow range of 230-450 km(3)/y with best fit value around 330 km(3)/y from the North Sea to the Baltic Sea during 1980-1999. Despite limited time series data on I-129, the model presented here demonstrates a new management tool for the Baltic Sea to calculate inflow water compared to conventional methods (such as salinity, temperature and hydrographic models). 

  • 373.
    Yi, Peng
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.
    Possnert, Göran
    Uppsala University, Disciplinary Domain of Science and Technology, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, Tandem Laboratory. Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.
    Aldahan, A.
    Hou, X. L.
    Bryhn, A. C.
    He, Peng
    Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.
    I-129 in the Baltic Proper and Bothnian Sea: application for estimation of water exchange and environmental impact2013In: Journal of Environmental Radioactivity, ISSN 0265-931X, E-ISSN 1879-1700, Vol. 120, p. 64-72Article in journal (Refereed)
    Abstract [en]

    We report here new data and a mass balance model for I-129 in the Baltic Proper and the Bothnian Sea covering the period from November-December 2009. The results showed that the general I-129 concentrations in the Bothnian Sea were two-four folds lower than in the Baltic Proper for both surface and deep water. Water exchange between the two basins based on the I-129 mass balance model suggests fluxes from the Baltic Proper to the Bothnian Sea and vice versa at 980 km(3)/y (600-1400 km(3)/y) and 1180 km(3)/y (780-1600 km(3)/y) respectively. Water retention time (residence time) in the Bothnian Sea was estimated at up to 4 years. Applying the I-129 exchange model, an estimate of total phosphorus and nitrogen inflow from the Baltic Proper to the Bothnian Sea indicates values of 20 +/- 7 x 10(3) tons/y and 300 +/- 50 x 10(3) tons/y respectively. The values for the outflow from the Bothnian Sea to the Baltic Proper hold 12 +/- 3 x 10(3) tons/y for total phosphorus and 283 +/- 55 x 10(3) tons/y for total nitrogen. These data and application of I-129 as a tracer of water masses provide information on small scale salinity changes which are vital for accurate understanding of the Baltic Sea ecosystems evolution through time.

  • 374.
    Yi, Peng
    et al.
    Hohai Univ, State Key Lab Hydrol Water Resources & Hydraul En, Nanjing 210098, Jiangsu, Peoples R China;Joint Int Res Lab Global Change & Water Cycle, Nanjing 210098, Jiangsu, Peoples R China;Hohai Univ, Coll Hydrol & Water Resources, Nanjing 210098, Jiangsu, Peoples R China.
    Yu, Zhongbo
    Hohai Univ, State Key Lab Hydrol Water Resources & Hydraul En, Nanjing 210098, Jiangsu, Peoples R China;Joint Int Res Lab Global Change & Water Cycle, Nanjing 210098, Jiangsu, Peoples R China;Hohai Univ, Coll Hydrol & Water Resources, Nanjing 210098, Jiangsu, Peoples R China.
    Chen, Peng
    Hohai Univ, State Key Lab Hydrol Water Resources & Hydraul En, Nanjing 210098, Jiangsu, Peoples R China;Joint Int Res Lab Global Change & Water Cycle, Nanjing 210098, Jiangsu, Peoples R China;Hohai Univ, Coll Hydrol & Water Resources, Nanjing 210098, Jiangsu, Peoples R China.
    Aldahan, Ala
    United Arab Emirates Univ, Dept Geol, Al Ain 17551, U Arab Emirates.
    Hou, Xiaolin
    Chinese Acad Sci, State Key Lab Loess & Quaternary Geol, Inst Earth Environm, Xian AMS Ctr,Shaanxi Key Lab AMS Technol & Applic, Xian 710061, Shaanxi, Peoples R China;Tech Univ Denmark, Ctr Nucl Technol, Riso Campus, DK-4000 Roskilde, Denmark.
    Fan, Yukun
    Chinese Acad Sci, State Key Lab Loess & Quaternary Geol, Inst Earth Environm, Xian AMS Ctr,Shaanxi Key Lab AMS Technol & Applic, Xian 710061, Shaanxi, Peoples R China.
    Chen, Li
    Desert Res Inst, Div Hydrol Sci, Las Vegas, NV 89119 USA.
    Possnert, Göran
    Uppsala University, Disciplinary Domain of Science and Technology, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, Tandem Laboratory.
    Muscheler, Raimund
    Lund Univ, Dept Geol Quaternary Sci, S-22362 Lund, Sweden.
    Zhou, Weijian
    Chinese Acad Sci, State Key Lab Loess & Quaternary Geol, Inst Earth Environm, Xian AMS Ctr,Shaanxi Key Lab AMS Technol & Applic, Xian 710061, Shaanxi, Peoples R China.
    Sudicky, Edward
    Univ Waterloo, Dept Earth & Environm Sci, Waterloo, ON N2L 3G1, Canada.
    Schwartz, Frank
    Ohio State Univ, Sch Earth Sci, Columbus, OH 43210 USA.
    Murad, Ahmed
    United Arab Emirates Univ, Dept Geol, Al Ain 17551, U Arab Emirates.
    Late Holocene pathway of Asian Summer Monsoons imprinted in soils and societal implications2019In: Quaternary Science Reviews, ISSN 0277-3791, E-ISSN 1873-457X, Vol. 215, p. 35-44Article in journal (Refereed)
    Abstract [en]

    The Asian Summer Monsoons (ASM) represent the main source of precipitation in China and East Asia with about one third of the world population and a region of widespread civilizations. Identifying the temporal and spatial patterns (pathways) of these monsoonal events during the Late Holocene to today has been a matter of debate amongst the scientific community. Here we show that the distribution patterns of the cosmogenic isotope Be-10 and oceanic I-127 in the topsoil across China exhibit imprints of the main ASM pathways. Our results indicate the monsoon pathway pattern persisted for several millennia or more and suggest a strong bond between Be-10 and water vapor transport patterns. Our data also reveal a(127)I distribution pattern controlled by the ASM pathways, rather than proximity to the sea or bedrock weathering. The persistent pathway of the ASM during the late Holocene, together with higher than average global soil iodine concentration, may have further strengthened the development of civilizations in this region of the world through reduction of iodine deficiency related diseases. (C) 2019 Elsevier Ltd. All rights reserved.

  • 375.
    Yunus, S.M. , A.K. Azad, S.-G. Eriksson, J. Eriksen, H.Rundlöf
    Uppsala University, Interfaculty Units, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, The Studsvik Neutron Research Laboratory.
    Temperature dependent magnetic characterization of the spinel system GaxCoFe1-xCrO4 (0 £ x £ 1) by neutron powder diffraction at the range 10K to 500K2003In: Physica B, Vol. 337, p. 323-Article in journal (Other scientific)
  • 376. Zakaria, A. K. M.
    et al.
    Asgar, M. A.
    Eriksson, S. -G
    Uppsala University, Disciplinary Domain of Science and Technology, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, The Studsvik Neutron Research Laboratory.
    Ahmed, F. U.
    Yunus, S. M.
    Study of the magnetic structure in the spinel oxides MnGaxFe1-xCrO4 by neutron diffraction2007In: Journal of Magnetism and Magnetic Materials, ISSN 0304-8853, E-ISSN 1873-4766, Vol. 310, no 2, p. E968-E970Article in journal (Refereed)
    Abstract [en]

    Magnetic properties of the spinel system MnGaxFe1-xCrO4 have been investigated using neutron diffraction (ND) technique in the temperature range 600K >= T >= 10 K. The distribution of the magnetic moments in the tetrahedral (A) and octahedral (B) sublattices and their ordering as a function of temperature and composition has been determined. Ferrimagnetic transition temperatures and spin compensation temperatures have been determined for all the specimens. The features observed in the ND results are explained in the light of competing inter and intra-sublattice exchange interactions. A diffuse signal was found to exist below the innermost Bragg reflection with a general increase with increasing compositions indicating the formation of short-range spin clusters.

  • 377. Zakaria, A. K. M.
    et al.
    Asgar, M. A.
    Eriksson, S. G.
    Uppsala University, Disciplinary Domain of Science and Technology, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, The Studsvik Neutron Research Laboratory.
    Ahmed, F. U.
    Yunus, S. M.
    Azad, A. K.
    Synthesis, cation distribution and crystal structure of the spinel oxides MnGaxFe1-xCrO4 by neutron diffraction2006In: Physica. B, Condensed matter, ISSN 0921-4526, E-ISSN 1873-2135, Vol. 385, p. 106-109Article in journal (Refereed)
    Abstract [en]

    The spinel system MnGaxFe1-xCrO4 (x = 0-0, 0.25, 0.50, 0.75 and 1.0) was prepared by the solid state sintering method in air at 1523 K. X-ray and neutron powder diffraction measurements were performed on the samples at 295 K for structural characterization. Rietveld refinement of the neutron diffraction data revealed that all the samples of the series possessed cubic symmetry corresponding to the space group Fd3m. The distributions of the four cations Mn, Ga, Fe and Cr over the two sublattices and other crystallographic parameters were found. The lattice constant showed a decrease with increasing Ga content in the system. The magnetic structure at room temperature was found to be ferrimagnetic in the composition range x <= 0.50.

  • 378.
    Zakaria, A. K. M., M. A. Asgar, S.- G. Eriksson, F. U. Ahmed, S. M. Yunus, A. K. Azad, H. Rundlöf
    Uppsala University, Interfaculty Units, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, The Studsvik Neutron Research Laboratory.
    Preparation of Zn substituted Ni-Fe-Cr ferrites and study of the crystal structure by neutron diffraction2003In: Materials Letters, Vol. 57, p. 4243-Article in journal (Refereed)
  • 379.
    Zakaria, A. K. M., M. A. Asgar, S.- G. Eriksson, F. U. Ahmed, S. M. Yunus, H. Rundlöf
    Uppsala University, Interfaculty Units, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, The Studsvik Neutron Research Laboratory.
    The study of the magnetic ordering in the spinel system ZnxNi1-xFeCrO4 by neutron diffraction2003In: J. Magnetism and Magnetic Materials, Vol. 265, p. 311-Article in journal (Refereed)
  • 380.
    Zakaria, A. K. M., M. A. Asgar, S.- G. Eriksson, F. U. Ahmed, S. M. Yunus, K. Azad, and H. Rundlöf
    Uppsala University, Interfaculty Units, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, The Studsvik Neutron Research Laboratory.
    Synthesis, cation distribution and crystal structure of the spinel system ZnxNi1-xFeCrO4 (0.2 £ x £ 0.8)2003In: Materials Science Forum, 2003, Vol. 443-444, p. 365-Conference paper (Refereed)
  • 381.
    Zakaria, A.K.M., Asgar, M.A., Ahmed, F.U., Yunus, S.M., Azad, A.K., Paranjpe, S.K., Das, A.
    Uppsala University, Interfaculty Units, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, The Studsvik Neutron Research Laboratory.
    Studies of Mn0.5Cr0.5Fe2O4 ferrite by neutron diffraction at different temperatures in the range 768K ³ T ³ 13K2002In: Indian Journal of Pure & Applied Physics, Vol. 40, p. 46-53Article in journal (Refereed)
  • 382. Zaytseva, Ganna I.
    et al.
    Skakovskii, Eugeny D.
    Possnert, Göran
    Uppsala University, Disciplinary Domain of Science and Technology, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, Tandem Laboratory.
    Radiocarbon pottery dating: the chemical compounds of organic fractions, the reliability of C-14 dates (preliminary results)2012In: Geochronometria, ISSN 1733-8387, E-ISSN 1897-1695, Vol. 39, no 4, p. 233-240Article in journal (Refereed)
    Abstract [en]

    In recent times, a large number of radiocarbon dates appeared for the Southern Neolithic on the basis of pottery dating because other organic matter has practically not been preserved. There are two organic fractions of pottery useful for dating: food residues and carbon from the pottery matrix itself. Food residues are often dated, but this material is not always preserved and is prone to being removed during the cleaning of the pottery. The clay mass of the pottery contains carbon, often directly visible upon breaking of the pottery. The article focusses on determining the chemical composition of the organic fractions in the pottery and the origin of the carbon. For this aim we used the nuclear magnetic resonance (NMR) method to identify the chemical compounds in the food residue and in the pottery matrix. As an example we used pottery from the Neolithic sites: Zamost'e (Central Russia) and the Varfolomeevskay sites (Southern European Russia, Low Volga region) from archaeological collections. The results obtained demonstrate that the food residue and the pottery matrix contain practically the same organic compounds, even if the relative abundances of various compounds are different in these materials. The origin of the carbon from pottery is discussed.

  • 383.
    Zdravkovic, Marta
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, International Science Programme (ISP).
    Chiwona-Karltun, Linley
    Swedish Univ Agr Sci, Dept Urban & Rural Dev, Uppsala, Sweden..
    Zink, Eren
    Uppsala University, Disciplinary Domain of Humanities and Social Sciences, Faculty of Arts, Department of Cultural Anthropology and Ethnology.
    Experiences and perceptions of South-South and North-South scientific collaboration of mathematicians, physicists and chemists from five southern African universities2016In: Scientometrics, ISSN 0138-9130, E-ISSN 1588-2861, Vol. 108, no 2, p. 717-743Article in journal (Refereed)
    Abstract [en]

    Faced with limited resources, scientists from around the world enter into collaborations to join their resources to conduct research. Like everywhere else, international co-publishing in southern African countries is increasingly on the rise. The aim of this study was to document and analyse the level of scientific productivity, collaboration patterns, scientists' experiences and attitudes towards South-South and South-North collaboration. We performed 105 interviews with scientists based at five southern African Universities, namely; University of Malawi-Chancellor College, National University of Science and Technology, the University of Botswana, the University of Zambia, and the University of Zimbabwe. We also traced 192 scientists from the various departments at these universities that had jointly published 623 scientific papers in the field of basic sciences in the period 1995-2014 in Web of Science journals. Our results show that in the majority of the cases funding from the North contributed substantially to increased scientific productivity, and international co-authorship. The results also show that collaboration with southern scientists is equally valued as that with northern scientists, but for different reasons. We conclude that supporting international and national collaboration which includes increased scientific mobility, strong scientific groups and networks, are key factors for capacity building of research in southern African Universities.

  • 384.
    Zetterström, P
    et al.
    Uppsala University, Interfaculty Units, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, The Studsvik Neutron Research Laboratory.
    Belushkin, AV
    McGreevy, RL
    Shuvalov, LA
    Structure and proton conduction in CsDSO41999In: SOLID STATE IONICS, ISSN 0167-2738, Vol. 116, no 3-4, p. 321-329Article in journal (Other scientific)
    Abstract [en]

    Caesium hydrogen sulphate is one of the most extensively studied superprotonic conductors with hydrogen bonds. A first order phase transition, from the low conductivity to the high conductivity phase, takes place at 414 K. The crystallographic structure o

  • 385.
    Zetterström, P
    et al.
    Uppsala University, Interfaculty Units, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, The Studsvik Neutron Research Laboratory.
    Chahid, A
    McGreevy, RL
    Quasi-elastic and low-energy inelastic neutron scattering from fast ion conducting AgBr1999In: PHYSICA B, ISSN 0921-4526, Vol. 266, no 1-2, p. 115-120Article in journal (Other scientific)
    Abstract [en]

    An apparently anomalous low-energy mode has been observed in AgBr close to the melting point, T-m, by inelastic neutron scattering using the IN6 time-of-flight spectrometer at ILL. Further measurements using the RITA triple-axis spectrometer at Ris phi Na

  • 386.
    Zetterström, P.
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, The Studsvik Neutron Research Laboratory.
    Delaplane, R.
    Wang, Y. D.
    Liaw, P. K.
    Choo, H.
    Saksl, K.
    Zhang, H. F.
    Ren, Y.
    Zuo, L.
    Nanoscale defect clusters in metallic glasses2007In: Journal of Physics: Condensed Matter, ISSN 0953-8984, E-ISSN 1361-648X, Vol. 19, no 37, p. 376217-Article in journal (Refereed)
    Abstract [en]

    The reverse Monte Carlo method was used to obtain three-dimensional discrete distributions of constitutional atoms in melt-spun CuZr and CuZrTi metallic glasses from neutron and x-ray diffraction data. It was found that the icosahedral short-range order is less stable in the CuZr binary alloy than in the Ti-doped ternary alloy. The present investigation also provides evidence on the medium-range order, characterized by some nanoscale clusters of defects, in the metallic-glassy state.

  • 387.
    Zetterström, P
    et al.
    Uppsala University, Interfaculty Units, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, The Studsvik Neutron Research Laboratory.
    McGreevy, R L
    Mellergård, A
    Eriksen, J
    Reorientation of anions in ion conducting sodium ortho-phosphate, a reverse Monte Carlo study of neutron diffraction data2002In: Appl. Phys. A, Vol. 75, no 1-3, p. 995-997Article in journal (Refereed)
    Abstract [en]

    Many solids containing anion groups such as SO4 2-

  • 388.
    Zetterström, P
    et al.
    Uppsala University, Interfaculty Units, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, The Studsvik Neutron Research Laboratory.
    McGreevy, RL
    Improved Monte Carlo program MCGR, for determining G(r)2000In: PHYSICA B, ISSN 0921-4526, Vol. 276-278, p. 187-188Article in journal (Refereed)
    Abstract [en]

    The program MCGR for determining total or partial radial distribution functions from one or more total structure factors has been improved. The maximum r-value can be much higher than before without increasing the execution time too much. This is desirabl

  • 389.
    Zhou, Y.
    et al.
    Royal Inst Technol, Sch Elect Engn, Dept Fus Plasma Phys, S-10405 Stockholm, Sweden..
    Bergsaker, H.
    Royal Inst Technol, Sch Elect Engn, Dept Fus Plasma Phys, S-10405 Stockholm, Sweden..
    Bykov, I.
    Royal Inst Technol, Sch Elect Engn, Dept Fus Plasma Phys, S-10405 Stockholm, Sweden..
    Petersson, P.
    Royal Inst Technol, Sch Elect Engn, Dept Fus Plasma Phys, S-10405 Stockholm, Sweden..
    Possnert, Göran
    Uppsala University, Disciplinary Domain of Science and Technology, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, Tandem Laboratory. Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Applied Nuclear Physics.
    Likonen, J.
    VTT Tech Res Ctr Finland, POB 1000, FIN-02044 Espoo, Finland..
    Pettersson, Jean
    Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - BMC, Analytical Chemistry. Culham Sci Ctr, CCFE, Abingdon OX14 3DB, Oxon, England..
    Koivuranta, S.
    VTT Tech Res Ctr Finland, POB 1000, FIN-02044 Espoo, Finland..
    Widdowson, A. M.
    Proceedings 25th IAEA Fus Energy Conf 2014, St Petersburg, Russia..
    Microanalysis of deposited layers in the inner divertor of JET with ITER-like wall2017In: NUCLEAR MATERIALS AND ENERGY, ISSN 2352-1791, Vol. 12, no SI, p. 412-417Article in journal (Refereed)
    Abstract [en]

    In JET with ITER-like wall, beryllium eroded in the main chamber is transported to the divertor and deposited mainly at the horizontal surfaces of tiles 1 and 0 (high field gap closure, HFGC). These surfaces are tungsten coated carbon fibre composite (CFC). Surface sampleswere collected following the plasma operations in 2011-2012 and 2013-2014 respectively. The surfaces, as well as polished cross sections of the deposited layers at the surfaces have been studied with micro ion beam analysis methods (mu-IBA). Deposition of Beand other impurities, and retention of D is microscopically inhomogeneous. Impurities and trapped deuterium accumulate preferentially in cracks, pits and depressed regions, and at the sides of large pits in the substrate (e.g. arc tracks where the W coating has been removed). With careful overlaying of mu-NRA elemental maps with optical microscopy images, it is possible to separate surface roughness effects from depth profiles at microscopically flat surface regions.

  • 390.
    Zhou, Y.
    et al.
    Royal Inst Technol, Sch Elect Engn, Dept Fus Plasma Phys, S-10405 Stockholm, Sweden.
    Bergsaker, H.
    Royal Inst Technol, Sch Elect Engn, Dept Fus Plasma Phys, S-10405 Stockholm, Sweden.
    Petersson, P.
    Royal Inst Technol, Sch Elect Engn, Dept Fus Plasma Phys, S-10405 Stockholm, Sweden.
    Possnert, Göran
    Uppsala University, Disciplinary Domain of Science and Technology, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, Tandem Laboratory.
    Likonen, J.
    VTT Tech Res Ctr Finland, POB 1000, FI-02044 Espoo, Finland.
    The effect of gyration on the deposition of beryllium and deuterium at rough surface on the divertor tiles with ITER-like-wall in JET2019In: Nuclear Materials and Energy, E-ISSN 2352-1791, Vol. 19, p. 155-160Article in journal (Refereed)
    Abstract [en]

    Experimental results from microbeam analyses on divertor tiles, through 2011-2012 and 2013-2014 operations in JET-ILW, showed that the deuterium retention and beryllium impurity deposition were non-uniform on the rough surface in micro meter scale. Frequently, Be and D were accumulated within pits, cracks and valleys in the range of similar to 10 mu m to similar to 100 mu m and selectively at side slopes within larger pits. In the deposited layers, it was also observed that cylindrical structures grow in a specific direction with respect to the magnetic field. In this work, a sample from the divertor in JET-ILW following 2013-2014 operation was analysed. The surface topography was measured with the focus stacking technique on photos from optical microscope and elemental distribution maps were obtained by micro-ion-beam analysis. In order to figure out the effect of ion gyro motion on Be and D deposition on the real divertor topography, a modelling of ion trajectories in plasma boundary was performed. Ion beam analysis data suggested that D accumulated on higher areas on the sample, while Be stayed on lower positions. The gyration of ions in edge plasma and corresponding impact positions on the sample surface could explain some IBA results qualitatively.

  • 391. Zotov, N
    et al.
    Delaplane, RG
    Uppsala University, Disciplinary Domain of Science and Technology, För teknisk-naturvetenskapliga fakulteten gemensamma enheter, The Studsvik Neutron Research Laboratory.
    Keppler, H
    Structural changes in sodium tetrasilicate glass around the liquid-glass transition: a neutron diffraction study1998In: Physics and chemistry of minerals, ISSN 0342-1791, E-ISSN 1432-2021, Vol. 26, no 2, p. 107-110Article in journal (Refereed)
    Abstract [en]

    The structure of sodium tetrasilicate (Na2Si4O9) glass and melt was studied in the range from 300 to 950 K by neutron diffraction. Increasing temperature leads to gradual decrease of the peak intensities in the static structure factors possibly with a change in the slope at the glass transition temperature (T g≅773 K), but no shift and broadening of the peaks is observed. Especially, the position of the first sharp diffraction peak (FSDP) at 1.6 Å–1 remains constant in the whole temperature range studied. The corresponding pair correlation functions g(r) are very similar at all temperatures. Only a slight broadening of the Si-O and O-O first nearest-neighbour peaks with temperature is observed, which can be attributed to temperature enhanced dynamic distortions of the SiO4 tetrahedra. All these results suggest that there is little change not only in the short- but also in the medium-range order of the sodium tetrasilicate glass and melt around the glass-liquid transition.

5678 351 - 391 of 391
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