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Author Dahan, O.; Tatarsky, B.; Enzel, Y.; Külls, C.; Seely, M.; Benito, G.
Title (down) 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 Emparanza, A.R.; Kampmann, R.; Caso, F.D.; Morales, C.; Nanni, A.
Title (down) 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
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Notes Approved no
Call Number THL @ christoph.kuells @ Ruizemparanza2022127028 Serial 83
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Author Severi, A.; Masoudian, M.; Kordi, E.; Roettcher, K.
Title (down) 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 Romeo, N.; Mabry, J.; Hillegonds, D.; Kainz, G.; Jaklitsch, M.; Matsumoto, T.
Title (down) 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
Keywords
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 Külls, C.J.; Ritter, M.
Title (down) Deuterium excess anomaly of precipitation in Svalbard Type Conference Article
Year 2010 Publication American Geophysical Union Abbreviated Journal
Volume 2010 Issue Pages 51
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Call Number THL @ christoph.kuells @ Kuells2010deuterium Serial 50
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Author Zaeri, A.; Mohammadi, Z.; Rezanezhad, F.
Title (down) Determining the source and mechanism of river salinity: An integrated regional study Type Journal Article
Year 2023 Publication Journal of Hydrology: Regional Studies Abbreviated Journal
Volume 47 Issue Pages 101411
Keywords River salinity, Salinization mechanism, Isotope, Halite brine, River sinuosity
Abstract Study region Zohreh River Basin, Southwest Iran Study focus The salinity of Zohreh River sharply increases in three salinity zones (SZs) along the river named SZ1, SZ2 (the focus of this study), and SZ3. Determining the salinity sources and salinization mechanism using an integrated approach including geological, hydrochemical, isotopic, geophysical, river sinuosity and hydrocarbon analysis are the main objectives of this study. The study focuses on the combination of evidence of regional-scale (i.e., river sinuosity and seismic data) and small-scale (i.e., drilling core analysis). New hydrologic insights for the region Among several known sources of river salinity, it was found that the water quality of the Zohreh River is mainly threatened by the salt-bearing Gachsaran Formation and oil-field brine. It is concluded that halite brine and oil-field brine simultaneously cause the salinization in SZ2, and their contributions were delineated to be 95% and 5%, respectively. The lack of reliable geological evidence to support halite dissolution in surficial layers by circulating waters suggests the possibility of a deep source of halite brine in SZ2. The results revealed that deep halite brine of the salt layers of Gachsaran Formation is mainly responsible for the salinization of SZ2. The mechanism of deep brine penetration to the river through the hidden fault failures detected by the combination of river sinuosity analysis and geophysical data for the first time.
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ISSN 2214-5818 ISBN Medium
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Notes Approved no
Call Number THL @ christoph.kuells @ Zaeri2023101411 Serial 251
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Author Adolph, G.; KÜlls, C.; Willscheid, A.
Title (down) Determination and validation of age structures as an improved measure of hydrological dynamics Type Conference Article
Year 2007 Publication Geophysical Research Abstracts Abbreviated Journal
Volume 9 Issue 08013 Pages
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Call Number THL @ christoph.kuells @ Adolph2007determination Serial 58
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Author Baram, S.; Ronen, Z.; Kurtzman, D.; Külls, C.; Dahan, O.
Title (down) Desiccation-crack-induced salinization in deep clay sediment Type Journal Article
Year 2013 Publication Hydrology and Earth System Sciences Abbreviated Journal
Volume 17 Issue 4 Pages 1533
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Publisher Copernicus GmbH Place of Publication Editor
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Notes Approved no
Call Number THL @ christoph.kuells @ Baram2013desiccation Serial 21
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Author Adolph, G.; Römer, T.; Külls, C.
Title (down) Deriving complex groundwater age structure by combining age dating and analytic element modelling Type Conference Article
Year Publication G-DAT 2008-Leipzig Abbreviated Journal
Volume Issue Pages 12
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Notes Approved no
Call Number THL @ christoph.kuells @ Adolph2008deriving Serial 55
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Author Zagana, E.; Külls, C.; Udluft, P.
Title (down) Der Wasserhaushalt des Aliakmonas Type Journal Article
Year 2000 Publication Vom Wasser Abbreviated Journal
Volume 94 Issue Pages 29-39
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Call Number THL @ christoph.kuells @ Zagana2000saa Serial 34
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