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Author Romeo, N.; Mabry, J.; Hillegonds, D.; Kainz, G.; Jaklitsch, M.; Matsumoto, T.
Title (up) Developments of a field gas extraction device and krypton purification system for groundwater radio-krypton dating at the IAEA Type Journal Article
Year 2022 Publication Applied Radiation and Isotopes Abbreviated Journal
Volume 189 Issue Pages 110450
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Abstract The long-lived radio-krypton isotope 81Kr (t1/2 = 2.29 × 105 yr) is an ideal tracer for old groundwater age dating in the range of 105–106 years which goes beyond the reach of radio-carbon (14C) age dating. Analytical breakthrough made over the last two decades in Atom Trap Trace Analysis (ATTA) has enabled the use of this isotope with extremely low abundance (81Kr/Kr = 6 × 10−13) to be used as a practical dating tool for very old groundwater. The International Atomic Energy Agency aims to provide this new isotope tool for better groundwater resource management of Member States and developed a field sampling device to collect dissolved gas samples from groundwater and a system to separate and purify trace amounts of krypton from the gas samples for the ATTA analysis. The design, setup and performances of our sampling and purification systems are described here. Our system can produce a high purity aliquot of about 5 μL of krypton from 5 L of air sample (recovery yield of >90%). The samples made by our system were confirmed to be acceptable for the ATTA analysis.
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ISSN 0969-8043 ISBN Medium
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Notes Approved no
Call Number THL @ christoph.kuells @ Romeo2022110450 Serial 214
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Author Severi, A.; Masoudian, M.; Kordi, E.; Roettcher, K.
Title (up) Discharge coefficient of combined-free over-under flow on a cylindrical weir-gate Type Journal Article
Year 2015 Publication ISH Journal of Hydraulic Engineering Abbreviated Journal
Volume 21 Issue 1 Pages 42-52
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Publisher Taylor & Francis Place of Publication Editor
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Notes Approved no
Call Number THL @ christoph.kuells @ doi:10.1080/09715010.2014.939503 Serial 88
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Author Emparanza, A.R.; Kampmann, R.; Caso, F.D.; Morales, C.; Nanni, A.
Title (up) Durability assessment of GFRP rebars in marine environments Type Journal Article
Year 2022 Publication Construction and Building Materials Abbreviated Journal
Volume 329 Issue Pages 127028
Keywords Composite FRP rebar, Durability, Service life, Marine structures, Reinforced concrete
Abstract Technologies developed over the last two decades have facilitated the use of glass fiber reinforced polymer (GFRP) bars as internal reinforcement for concrete structures, specially in coastal environments, mainly due to their corrosion resistance. To-date, most durability studies have focused on a single mechanical parameter (tensile strength) and a single aging environment (exposure to high alkalinity). However, knowledge gaps exists in understanding how other mechanical parameters and relevant conditioning environments may affect the durability of GFRP bars. To this end, this study assesses the durability for different physio-mechanical properties of GFRP rebars, post exposure to accelerated conditioning in seawater. Six different GFRP rebar types were submerged in seawater tanks, at various temperatures (23°C, 40°C and 60°C) for different time periods (60, 120, 210 and 365 days). In total six different physio-mechanical properties were assessed, including: tensile strength, E-modulus, transverse and horizontal shear strength, micro-structural composition and lastly, bond strength. It was inferred that rebars with high moisture absorption resulted in poor durability, in that it affected mainly the tensile strength. Based on the Arrhenius model, at 23°C all the rebars that met the acceptance criteria by ASTM D7957 are expected to retain 85% of the tensile strength capacity.
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ISSN 0950-0618 ISBN Medium
Area Expedition Conference
Notes Approved no
Call Number THL @ christoph.kuells @ Ruizemparanza2022127028 Serial 83
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Author Dahan, O.; Tatarsky, B.; Enzel, Y.; Külls, C.; Seely, M.; Benito, G.
Title (up) Dynamics of flood water infiltration and ground water recharge in hyperarid desert Type Journal Article
Year 2008 Publication Groundwater Abbreviated Journal
Volume 46 Issue 3 Pages 450-461
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Publisher Blackwell Publishing Inc Malden, USA Place of Publication Editor
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Notes Approved no
Call Number THL @ christoph.kuells @ Dahan2008dynamics Serial 27
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Author Pontér, S.; Rodushkin, I.; Engström, E.; Rodushkina, K.; Paulukat, C.; Peinerud, E.; Widerlund, A.
Title (up) Early diagenesis of anthropogenic uranium in lakes receiving deep groundwater from the Kiruna mine, northern Sweden Type Journal Article
Year 2021 Publication Science of The Total Environment Abbreviated Journal
Volume 793 Issue Pages 148441
Keywords Isotope ratios, Mine water, Sediments, Uranium
Abstract The uranium (U) concentrations and isotopic composition of waters and sediment cores were used to investigate the transport and accumulation of U in a water system (tailings pond, two lakes, and the Kalix River) receiving mine waters from the Kiruna mine. Concentrations of dissolved U decrease two orders of magnitude between the inflow of mine waters and in the Kalix River, while the concentration of the element bound to particulate matter increases, most likely due to sorption on iron‑manganese hydroxides and organic matter. The vertical distribution of U in the water column differs between two polluted lakes with a potential indication of dissolved U supply from sediment’s pore waters at anoxic conditions. Since the beginning of exposure in the 1950s, U concentrations in lake sediments have increased \textgreater20-fold, reaching concentrations above 50 μg g-1. The distribution of anthropogenic U between the lakes does not follow the distribution of other mine water contaminants, with a higher relative proportion of U accumulating in the sediments of the second lake. Concentrations of redox-sensitive elements in the sediment core as well as Fe isotopic composition were used to re-construct past redox-conditions potentially controlling early diagenesis of U in surface sediments. Two analytical techniques (ICP-SFMS and MC-ICP-MS) were used for the determination of U isotopic composition, providing an extra dimension in the understanding of processes in the system. The (234 U)/(238 U) activity ratio (AR) is rather uniform in the tailings pond but varies considerably in water and lake sediments providing a potential tracer for U transport from the Kiruna mine through the water system, and U immobilization in sediments. The U mass balance in the Rakkurijoki system as well as the amount of anthropogenic U accumulated in lake sediments were evaluated, indicating the immobilization in the two lakes of 170 kg and 285 kg U, respectively.
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ISSN 0048-9697 ISBN Medium
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Notes Approved no
Call Number THL @ christoph.kuells @ ponter_early_2021 Serial 154
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