Relevant bibliographies by topics / Isotopen

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Isotopen'

Author: Grafiati
Published: 4 June 2021
Last updated: 31 January 2023

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Journal articles on the topic "Isotopen"

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van den Driessche, M., S. van der Schoor, Y. Ghoos, and G. Veereman-Wauters. "Ademtests met stabiele isotopen." Tijdschrift voor kindergeneeskunde 68, no. 1 (2000): 235–40. http://dx.doi.org/10.1007/bf03061316.

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Nitychorlik, Jerzy, Andrzej Ber, Jochen Hoefs, Tomasz Krzywicki, Jürgen Schneider, and Hanna Winter. "Interglaziale Klimaschwankungen in Nordost-Polen – palynologische und isotopengeochemische Untersuchungen an organischen Seesedimenten." E&G Quaternary Science Journal 50, no. 1 (2000): 86–94. http://dx.doi.org/10.3285/eg.50.1.06.

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Abstract. Die Ergebnisse von δ18O- und δ13C-Bestimmungen an Seesedimenten aus dem Augustovian-Interglazial in Nordost-Polen lassen sich nicht einfach interpretieren, weil die δ18O-Werte für palynologisch kühle Perioden hoch (-4 bis -6‰), dagegen für einen palynologisch wärmeren Zeitraum niedriger (-8 bis -10‰) sind. Zusätzliche malakologische, palynologische und Isotopen-Untersuchungen weisen auf einen hohen Grad der Umlagerung älterer Sedimente vor allem in kühlen Perioden mit niedrigem Wasserstand hin. Die Annahme, dass allochthoner Kalzit aus tertiären marinen Sedimenten in die Sedimentatio
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Carle, Reinhold. "Isotopen-Massenspektrometrie Grundlagen und Anwendungsmöglichkeiten." Pharmazie in Unserer Zeit 20, no. 2 (1991): 75–82. http://dx.doi.org/10.1002/pauz.19910200208.

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Höfer-Öllinger, Giorgio. "Isotopenhydrogeologische Untersuchungen im südlichen Salzburger Becken (Golling, Kuchl, Vigaun, Hallein), Österreich." Grundwasser 26, no. 2 (2021): 155–73. http://dx.doi.org/10.1007/s00767-021-00474-2.

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ZusammenfassungTrotz seiner Bedeutung in der Trinkwasserversorgung ist die Herkunft des Grundwassers des Gamper Brunnenfelds (GBF) im Südlichen Salzburger Becken (SSB) ungeklärt. Eine 2014 bis 2016 durchgeführte Studie unter Verwendung von stabilen Isotopen und einer numerischen 2D-Modellierung führte zu wichtigen Erkenntnissen, aber auch zu widersprüchlichen Schlussfolgerungen: Die dabei numerisch nachgewiesene Anspeisung des GBF durch die nahe Salzach ist aus Sicht der stabilen Isotope nicht möglich.Im Zeitraum 2017 bis 2019 wurden in einer weiteren Studie an 17 Messstellen Proben zur Analyt
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Musich, О., A. Zubko, and О. Demyanуuk. "Isotopic effect of macro- and microelements in ecosystems." Balanced nature using, no. 4 (August 18, 2020): 132–38. http://dx.doi.org/10.33730/2310-4678.4.2020.226644.

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Isotopic effects occurring in living organisms due to metabolism are analyzed. The phenomenon of metabolism is considered in the classical sense as a combination of biochemical reactions (mainly enzyma­tic) that take place in the cells of living beings and provide the cleavage, synthesis and interconversion of complex compounds. The scope of use of natural isotopes is wide and diverse. Isotopes are carriers of information about the birth and transformation of molecules, and isotope fractionation is a chemical characteristic of a substance. Isotope metabolism consists in the intermolecular frac
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Raeder, Sebastian, Mustapha Laatiaoui, and Michael Block. "Vermessung von Nobelium-Isotopen mit Laserlicht." Physik in unserer Zeit 49, no. 5 (2018): 214–15. http://dx.doi.org/10.1002/piuz.201870504.

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Jackisch, Dominik, Bi Xuan Yeo, Adam D. Switzer, et al. "Precipitation stable isotopic signatures of tropical cyclones in Metropolitan Manila, Philippines, show significant negative isotopic excursions." Natural Hazards and Earth System Sciences 22, no. 1 (2022): 213–26. http://dx.doi.org/10.5194/nhess-22-213-2022.

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Abstract. Tropical cyclones have devastating impacts on the environment, economies, and societies and may intensify in the coming decades due to climate change. Stable water isotopes serve as tracers of the hydrological cycle, as isotope fractionation processes leave distinct precipitation isotopic signatures. Here we present a record of daily precipitation isotope measurements from March 2014 to October 2015 for Metropolitan Manila, a first-of-a-kind dataset for the Philippines and Southeast Asia. We show that precipitation isotopic variation at our study site is closely related to tropical c
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Li, Xiangnan, Baisha Weng, Denghua Yan, et al. "Anthropogenic Effects on Hydrogen and Oxygen Isotopes of River Water in Cities." International Journal of Environmental Research and Public Health 16, no. 22 (2019): 4429. http://dx.doi.org/10.3390/ijerph16224429.

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Stable hydrogen and oxygen isotopes are important indicators for studying water cycles. The isotopes are not only affected by climate, but are also disturbed by human activities. Urban construction has changed the natural attributes and underlying surface characteristics of river basins, thus affecting the isotopic composition of river water. We collected urban river water isotope data from the Global Network for Isotopes in Rivers (GNIR) database and the literature, and collected river water samples from the Naqu basin and Huangshui River basin on the Tibetan Plateau to measure hydrogen and o
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Emmanuel, S., J. A. Schuessler, J. Vinther, A. Matthews, and F. von Blanckenburg. "A preliminary study of iron isotope fractionation in marine invertebrates (chitons, Mollusca) in near-shore environments." Biogeosciences 11, no. 19 (2014): 5493–502. http://dx.doi.org/10.5194/bg-11-5493-2014.

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Abstract. Chitons (Mollusca) are marine invertebrates that produce radulae (teeth or rasping tongues) containing high concentrations of biomineralized magnetite and other iron-bearing minerals. As Fe isotope signatures are influenced by redox processes and biological fractionation, Fe isotopes in chiton radulae might be expected to provide an effective tracer of ambient oceanic conditions and biogeochemical cycling. Here, in a pilot study to measure Fe isotopes in marine invertebrates, we examine Fe isotopes in modern marine chiton radulae collected from different locations in the Atlantic and
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Miljević, Nada, and Dušan Golobočanin. "Potential Use of Environmental Isotopes in Pollutant Migration Studies." Archives of Industrial Hygiene and Toxicology 58, no. 2 (2007): 251–62. http://dx.doi.org/10.2478/v10004-007-0015-5.

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Potential Use of Environmental Isotopes in Pollutant Migration StudiesThis article presents the use of natural abundance stable isotope (hydrogen, carbon, nitrogen, oxygen, chlorine) analysis data as a tool for providing important information about the origin of contaminants, the contribution of different sources to a multi-source plume, characterisation of their complex transport (rate and mechanisms) and for evaluating the success of contaminated site remediation. Isotopic signatures of contaminants are useful tracers of their sources, while isotopic fractionation can be used to quantitative
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Dissertations / Theses on the topic "Isotopen"

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Kohstall, Christoph. "Kollektive Dipolanregungen in den stabilen Cd-Isotopen." [S.l. : s.n.], 2004. http://www.bsz-bw.de/cgi-bin/xvms.cgi?SWB11759357.

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Pfister, Christian Ulrich. "Radioaktive Markierung eines tumorspezifischen monoklonalen Antikörpers mit Isotopen des Rutheniums /." [S.l.] : [s.n.], 1987. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=8244.

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Bisinger, Tanja. "Bestimmung von Plutonium-Isotopen in der Umwelt mittels Alphaspektrometrie und AMS." Hannover Technische Informationsbibliothek und Universitätsbibliothek Hannover, 2010. http://d-nb.info/1001031040/34.

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Maier, Cornelia. "Exploring stable isotopic variation in scleractinian coral tissue and skeleton proxies for climate, ecological plasticity and coral functioning /." [S.l. : Amsterdam : s.n.] ; Universiteit van Amsterdam [Host], 2004. http://dare.uva.nl/document/73795.

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Daerr, Heiner [Verfasser]. "Optische Systeme und Konzeptionen für die Ultraspurenanalyse von Krypton-Isotopen / Heiner Daerr." München : Verlag Dr. Hut, 2011. http://d-nb.info/101898089X/34.

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Bisinger, Tanja [Verfasser]. "Bestimmung von Plutonium-Isotopen in der Umwelt mittels Alphaspektrometrie und AMS / Tanja Bisinger." Hannover : Technische Informationsbibliothek und Universitätsbibliothek Hannover, 2010. http://d-nb.info/1001031040/34.

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Steiger, Rudolf von. "Modelle zur Fraktionierung der Häufigkeiten von Elementen und Isotopen in der solaren Chromosphäre /." [S.l : s.n.], 1988. http://www.ub.unibe.ch/content/bibliotheken_sammlungen/sondersammlungen/dissen_bestellformular/index_ger.html.

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Graf, H. P. [Verfasser]. "Anregungsfunktionen fuer (α,xn)-und (α,pxn)-Kernreaktionen mit Mo-Isotopen / H. P. Graf". Karlsruhe : KIT-Bibliothek, 2010. http://d-nb.info/1187253200/34.

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Greiner, Rolf. "Die Anwendung der Isotopen-Transientenmethode in der Hydroformylierung von Propen an festen metallhaltigen Katalysatoren." [S.l. : s.n.], 2003. http://www.bsz-bw.de/cgi-bin/xvms.cgi?SWB10678416.

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Göhring, Andrea [Verfasser], and Gisela [Akademischer Betreuer] Grupe. "Anwendung KDD-basierter Methoden zur Interpretation multi-dimensionaler Isotopen-Fingerabdrücke / Andrea Göhring ; Betreuer: Gisela Grupe." München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2019. http://d-nb.info/1207270024/34.

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Books on the topic "Isotopen"

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Christoph, Gernot. Beiträge zur Theorie der Isotopen- und Elementgeochemie. Zentralinstitut für Isotopen- und Strahlenforschung, Akademie der Wissenschaften der DDR, 1988.

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Arnikar, Hari Jeevan. Isotopes in the atomic age. Wiley Eastern, 1989.

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Isotopes in the atomic age. Wiley, 1989.

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Segschneider, Hans-Josef. Untersuchungen zur Aufnahme und zum Einbau von anthropogenen Stickoxiden (NOx) durch Sonnenblumen und Mais mittels 15N-Isotopen-Markierung. Forschungszentrum Jülich GmbH, Zentralbibliothek, 1994.

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Stable isotope geochemistry. 5th ed. Springer, 2004.

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Faure, Gunter. Principles of isotope geology. 2nd ed. Wiley, 1986.

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Stable isotope geochemistry. 3rd ed. Springer-Verlag, 1987.

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W, Valley John, Cole David R, and Mineralogical Society of America, eds. Stable isotope geochemistry. Mineralogical Society of America, 2001.

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Principles of isotope geology. 2nd ed. Wiley, 1986.

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Stable isotope geochemistry. 4th ed. Springer, 1997.

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Book chapters on the topic "Isotopen"

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Holtzhauer, Martin. "Markierung mit radioaktiven Isotopen." In Biochemische Labormethoden. Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/978-3-642-97111-2_7.

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Werner, Roland A., and Marc-André Cormier. "Isotopes—Terminology, Definitions and Properties." In Stable Isotopes in Tree Rings. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-92698-4_8.

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AbstractThe intention of this chapter is to give insight into the properties and peculiarities of the stable isotopes of the bioelements. Following an overview about the terminology and ʻtechnical jargonʼ used in stable isotope sciences, methods to calculate and express isotopic abundances are presented. Subsequently, a short description of the physicochemical basis of equilibrium and kinetic (mass-dependent) isotope effects (EIEs and KIEs) as origin of isotope fractionation in chemical and biological systems is given. Further, measures for calculation and presentation of isotope fractionation are introduced and the corresponding properties of these quantities are critically discussed. Finally, examples for equilibrium and kinetic isotope fractionation in biochemical reactions are presented in more details and subsequent effects and consequences including the relationship between EIEs and KIEs are reviewed.
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Pfahler, V., J. Adu-Gyamfi, D. O’Connell, and F. Tamburini. "The Use of the δ18OP to Study P Cycling in the Environment." In Oxygen Isotopes of Inorganic Phosphate in Environmental Samples. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-97497-8_1.

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AbstractPhosphorus (P) fertilizers are known to increase crop productivity; however, when applied in excess, it can cause serious environment pollution. Monitoring P pollution in natural environments using stable isotopes has been difficult because P has only one stable isotope (31P) making the use of P stable isotope tracing not an option. Radioactive P isotopes (32P and 33P) have been used but its drawbacks are the short half-life, health risks and safety procedures required to apply them in agricultural catchments. Phosphorus in organic and inorganic P forms is strongly bonded to oxygen (O), which has three stable isotopes, providing a system to track P cycling in agricultural catchments and environment using the stable isotopes of O in phosphate (δ18O-PO4). In recent years, various studies have indicated that the analysis of the stable isotopic composition of oxygen (O) bound to P (δ18Op) to better understand P cycling in the environment, has become a promising tracer (surrogate) to investigate soil P transformation, plant P uptake and to trace the sources of P from the soil to water bodies and the environment. The chapter outlines the background and examples of δ18Op studies in sediments, soils, fresh water, mineral fertilizers and plants.
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Helle, Gerhard, Maren Pauly, Ingo Heinrich, Karina Schollän, Daniel Balanzategui, and Lucas Schürheck. "Stable Isotope Signatures of Wood, its Constituents and Methods of Cellulose Extraction." In Stable Isotopes in Tree Rings. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-92698-4_5.

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AbstractIn this chapter, we give some basic information on the chemical and isotopic properties of wood constituents and describe their relative contribution to the isotopic signature of wood. Based on these considerations we review studies that have compared stable isotope signals of wood with those of corresponding cellulose. We exemplify how relationships of wood-based tree-ring stable isotope sequences with climate can be affected by varying proportions of wood constituents like cellulose, lignin and extractives. A majority of benchmarking studies suggests that cellulose extraction may not be necessary. However, based upon existing research, a general statement cannot be made on the necessity of cellulose extraction. Changes in wood composition can particularly influence environmental signal strength during periods of low isotope variability. Cellulose extraction removes any effects from changing wood composition. We present the three established chemical approaches of extraction, outline how to test the purity of isolated cellulose and present user-friendly efficient experimental setups allowing to simultaneously process hundreds of samples in one batch. Further, we briefly address the analysis of stable isotopes of lignin methoxyl groups because of easy sample preparation and its potential additional value for studies on fossil wood.
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Kagawa, Akira, and Giovanna Battipaglia. "Post-photosynthetic Carbon, Oxygen and Hydrogen Isotope Signal Transfer to Tree Rings—How Timing of Cell Formations and Turnover of Stored Carbohydrates Affect Intra-annual Isotope Variations." In Stable Isotopes in Tree Rings. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-92698-4_15.

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AbstractIn this chapter, we discuss post-photosynthetic processes that affect intra-annual variation in the stable isotopes of tree rings, such as timing of cell formations and turnover of stored carbohydrates, by combining research findings gained by using either natural-abundance or artificially-enriched carbon, oxygenand hydrogen isotopes. We focus on within-ring variation in stable isotope ratios, with an emphasis on aligning observed ratios in whole wood or extracted cellulose to seasonal dynamics in climate and phenology. We also present a discussion of isotopic fractionation that operates within the scope of observed variations across individual rings. We then introduce a model that traces the seasonal partitioning of photosynthate into tree rings via storage pool, which is based on experimental data gained from labeling studies using artificially enriched 13CO2 gas. Finally, we will describe our current understanding of post-photosynthetic signal transfer processes of oxygenand hydrogen isotopes from leaves to tree rings, such as exchange of oxygen and hydrogen between storage carbohydrates and local cambial water, and possible causes of difference in oxygen and hydrogen isotope fractionations. Finally, we discuss mechanisms behind how oxygen and hydrogen from foliar-absorbed liquid water is then incorporated into wood biomass, by introducing results gained from recent H218O and HDO pulse-labeling experiments.
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Kagawa, Akira, and Giovanna Battipaglia. "Post-photosynthetic Carbon, Oxygen and Hydrogen Isotope Signal Transfer to Tree Rings—How Timing of Cell Formations and Turnover of Stored Carbohydrates Affect Intra-annual Isotope Variations." In Stable Isotopes in Tree Rings. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-92698-4_15.

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AbstractIn this chapter, we discuss post-photosynthetic processes that affect intra-annual variation in the stable isotopes of tree rings, such as timing of cell formations and turnover of stored carbohydrates, by combining research findings gained by using either natural-abundance or artificially-enriched carbon, oxygenand hydrogen isotopes. We focus on within-ring variation in stable isotope ratios, with an emphasis on aligning observed ratios in whole wood or extracted cellulose to seasonal dynamics in climate and phenology. We also present a discussion of isotopic fractionation that operates within the scope of observed variations across individual rings. We then introduce a model that traces the seasonal partitioning of photosynthate into tree rings via storage pool, which is based on experimental data gained from labeling studies using artificially enriched 13CO2 gas. Finally, we will describe our current understanding of post-photosynthetic signal transfer processes of oxygenand hydrogen isotopes from leaves to tree rings, such as exchange of oxygen and hydrogen between storage carbohydrates and local cambial water, and possible causes of difference in oxygen and hydrogen isotope fractionations. Finally, we discuss mechanisms behind how oxygen and hydrogen from foliar-absorbed liquid water is then incorporated into wood biomass, by introducing results gained from recent H218O and HDO pulse-labeling experiments.
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Andreu-Hayles, Laia, Mathieu Lévesque, Rossella Guerrieri, Rolf T. W. Siegwolf, and Christian Körner. "Limits and Strengths of Tree-Ring Stable Isotopes." In Stable Isotopes in Tree Rings. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-92698-4_14.

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AbstractThis chapter aims at summarizing strengths and caveats on the suitability of stable carbon and oxygen isotopes in tree rings as recorders for fingerprints of environmental influences. First, environmental constraints limiting tree growth and shaping tree species distribution worldwide are discussed. Second, examples are presented for environmental conditions under which tree-ring isotopes record environmental signals particularly well, but also cases where physiological processes can mask climate signals. Third, the link between leaf-level carbon assimilation and the investment of assimilates in the stem during the annual ring formation are discussed in light of the resulting deviations of the isotopic values between leaves and tree rings. Finally, difficulties and pitfalls in the interpretation of stable isotope signals in tree rings are reviewed. These problems often result from a poor understanding of when and how the tree canopy, stems and roots are physiologically interconnected. Current literature suggests that photosynthesis and radial growth are only loosely coupled, if at all, challenging the interpretation of environmental signals recorded in tree-ring isotopes. Harsh environmental conditions (e.g. low temperatures, drought) often result in a decoupling of carbon assimilation and growth. The chapter closes by providing possible solutions on how to improve the detection of environmental information from stable isotope signals by integrating scales and different methodological approaches.
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Gill, Robin. "Was können wir von den Isotopen lernen?" In Chemische Grundlagen der Geo- und Umweltwissenschaften. Springer Berlin Heidelberg, 2020. http://dx.doi.org/10.1007/978-3-662-61500-3_10.

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Wei, Liang, John D. Marshall, and J. Renée Brooks. "Process-Based Ecophysiological Models of Tree-Ring Stable Isotopes." In Stable Isotopes in Tree Rings. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-92698-4_26.

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AbstractTree-ring stable isotopes can be used to parameterizeprocess-based models by providing long-term data on tree physiological processes on annual or finer time steps. They can also be used to test process-based ecophysiological models for the assumptions, hypotheses, and simplifications embedded within them. However, numerous physiological and biophysical processes influence the stable carbon (δ13C) and oxygen (δ18O) isotopes in tree rings, so the models must simplify how they represent some of these processes to be useful. Which simplifications are appropriate depends on the application to which the model is applied. Fortunately, water and carbon fluxes represented in process-based models often have strong isotopic effects that are recorded in tree-ring signals. In this chapter, we review the status of several tree-ring δ13C and δ18O models simulating processes for trees, stands, catchments, and ecosystems. This review is intended to highlight the structural differences among models with varied objectives and to provide examples of the valuable insights that can come from combining process modeling with tree-ring stable isotope data. We urge that simple stable isotope algorithms be added to any forest model with a process representation of photosynthesis and transpiration as a strict test of model structure and an effective means to constrain the models.
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Leavitt, Steven W., and John Roden. "Isotope Dendrochronology: Historical Perspective." In Stable Isotopes in Tree Rings. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-92698-4_1.

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AbstractAlthough the fields of dendrochronology and light stable-isotope mass spectrometry emerged at different times in the first half of the 20th Century, their convergence with the earliest measurements of isotope composition of tree rings is now ca. 70 years old. Much of the early stable isotope analysis (including on wood) explored natural variation of isotopes in the environment, but those researchers making the measurements were already contemplating the role of the isotope composition of the source substrates (e.g., water and CO2), biochemical fractionation, and environment as contributors to final tree-ring isotope values. Growing interest in tree-ring isotopes was heavily motivated by paleoclimate or paleoatmosphere reconstruction, but this new field rapidly developed to generate greatly improved mechanistic understanding along with expanded applications to physiology, ecology, pollution, and more. This chapter primarily charts the historical progression in tree-ring C-H-O isotope studies over those seven decades, but it also identifies potential productive emerging and future directions.
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Conference papers on the topic "Isotopen"

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Pyrayev, A. N., and A. A. Maksimova. "ISOTOPIC COMPOSITION OF GROUNDWATER IN OIL AND GAS DEPOSITS IN THE CENTRAL PART OF THE TRANS-URAL MEGAMONOCLISE." In All-Russian Youth Scientific Conference with the Participation of Foreign Scientists Trofimuk Readings - 2021. Novosibirsk State University, 2021. http://dx.doi.org/10.25205/978-5-4437-1251-2-117-120.

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The article presents the first results of complex isotope-hydrogeochemical studies of reservoir waters of the Upper Jurassic deposits of the central regions of the Zaural megamonoclysis. It was shown that most waters have a narrow distribution of oxygen and hy-drogen isotopes (δD from 103,2 to –85,6 % and δ18O from –15,4 to –12,9 %). Some of them have pronounced excursions on the isotopic composition, which indicates a difference in their genesis: from condensate to mixed with ancient infiltrogenic. The isotopic composition of car-bon of water-dissolved carbon dioxide (δ13СDIC from –41,6 to –
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Almubarak, Zainab, Mohammad Alrowaie, Feng Lu, and Ranya Algeer. "Gas Chemical and Carbon Isotope Composition as a Diagnostic Tool for Energy." In SPE Annual Technical Conference and Exhibition. SPE, 2022. http://dx.doi.org/10.2118/209992-ms.

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Abstract As the world is moving toward a low-carbon energy structure, natural gas has become critical in the supply of global energy. The genetic identification of different types of natural gas is important for the assessment of their source and exploration potential. Chemical and carbon isotopic compositions of produced gas are useful tools to assess their origin, thermal maturity, migration and to monitor gas production. In this study, we present different geochemical approaches to assess the origin of the gases and thermal maturity as well as to evaluate the effect of adsorption on shale g
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Ahsan, Dr Syed Asif, Reem Ali Mabkhout AlSeiari, Dr Tamer Koksalan, and Yatindra Bhushan. "Assessment of Sweep Efficiency and Breakthrough Using CO2, H2O, Carbon and Hydrogen Isotope Composition in a Water Alternating with Gas EOR Project in Onshore Abu Dhabi, UAE." In Abu Dhabi International Petroleum Exhibition & Conference. SPE, 2021. http://dx.doi.org/10.2118/208211-ms.

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Abstract Measuring sweep efficiency and understanding breakthrough are the most important parameters to assess an Enhanced Oil Recovery (EOR) project having Water Alternating with miscible CO2 Gas (WAG) injection. The objective of this study was to use CO2, H2O and isotope compositions to assess sweep efficiency and breakthrough in producer wells in an ADNOC Onshore field in order to take the necessary actions for project optimization (e.g., injector and/or future producer well location optimization). CO2 and H2O compositions, along with their respective carbon and hydrogen isotopes, was integ
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Jia Yi, Xu, Ma Xu Bo, Shen Jing Wen, Liu Jia Yi, and Chen Yi Xue. "A New Method to Evaluate the Correlation Coefficients Between Nuclides in Uncertainty and Sensitivity Analysis." In 2017 25th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/icone25-66777.

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Uncertainty and sensitivity analysis is an essential component of nuclear engineering calculations. Uncertainties in the cross-section input data directly affect uncertainties in the results. The covariance values between different types of cross-sections are considered in the NJOY covariance library. However, the correlation coefficient between isotopes can depend on the specific problem. The correlation coefficient between 235U and 238U in a pressurized water reactor (PWR) might be different from that in a fast reactor. In this study, a new Monte Carlo-based method is proposed for calculatin
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Lu, Feng Hu. "Using Isotope Technology to Identify Oil and Gas Reservoir Sweet Spots." In SPE Reservoir Characterisation and Simulation Conference and Exhibition. SPE, 2023. http://dx.doi.org/10.2118/212642-ms.

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Abstract Porosity and permeability of rocks are crucial parameters utilized to assess the quality of oil and gas reservoirs. Diagenesis in carbonate reservoirs commonly results in dissolution, and creates secondary porosity and permeability. At the same time, geochemical records (e.g., isotopes and elements) in the carbonate rocks are diagenetically altered. This study is to utilize the isotope technology to evaluate diagenesis and its impact on oil and gas reservoirs. Micro-samples were collected from marine carbonate rocks in a studied reservoir for carbon and oxygen isotope analyses, plus a
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Habermann, B., M. Patt, and O. Sabri. "Untersuchungen zur Bestimmung der „ungefähren Halbwertszeit“ von längerlebigen Isotopen wie Y-90 und Lu-177 im klinischen Radiochemielabor." In NuklearMedizin 2020. © Georg Thieme Verlag KG, 2020. http://dx.doi.org/10.1055/s-0040-1708270.

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Eerkens, Jeff W., Jay F. Kunze, and Leonard J. Bond. "Laser Isotope Enrichment for Medical and Industrial Applications." In 14th International Conference on Nuclear Engineering. ASMEDC, 2006. http://dx.doi.org/10.1115/icone14-89767.

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Use of lasers for isotope separation has been considered for many decades. None of the proposed methods have attained sufficient proof of principal status to be economically attractive to pursue commercially. Some of the authors have succeeded in separating sulfur isotopes using a rather new and different method, known as condensation repression. In this scheme, a gas of the selected isotopes for enrichment is irradiated with a laser at a particular wavelength that would excite only one of the isotopes. The entire gas is subjected to low temperatures sufficient to cause condensation on a cold
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Stehmeier, Lester, Brad Magyar, Karlis Muehlenbachs, Xiaosu Lang, and Ajay Dalai. "Use of Stable Isotope Ratios to Determine the Origin of Coke Formed in Gas Turbines." In 2002 4th International Pipeline Conference. ASMEDC, 2002. http://dx.doi.org/10.1115/ipc2002-27115.

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Coke deposits can form in compression equipment on natural gas transmission lines. These deposits are a result of incomplete combustion due to poor fuel gas quality or incorrect equipment design and/or operation. There is an isotopic “signature” which is carried over from the fuel gas into the coke if incomplete combustion occurs, allowing the origin of the coke deposit to be identified. The use of a continuous flow gas chromatograph isotope ratio mass spectrometer (GC/IRMS) provides a convenient method for determining the isotopic composition of the components in the fuel gas. These ratios ca
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Neto, Jonas Jakutis, Patricia Bueno, Jhonatha R. dos Santos, et al. "First Observations of Rare-Earth Isotope Enrichment by Atomic Vapor Laser Separation in Brazil." In Latin America Optics and Photonics Conference. Optica Publishing Group, 2022. http://dx.doi.org/10.1364/laop.2022.m2d.3.

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Modern technologies depend on Rare-Earth elements, and they can be further improved using isotopic enriched/pure materials. This work brings the first successful attempt to enrich 163Dy by AVLIS (Atomic Vapor Laser Isotope Separation) in Brazil.
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Lv, Jinxu, Ning Lv, Huiping Guo, et al. "Uranium Radioactivity Measurement for Low-Level Wastewater Based on Ultra-Low Level Liquid Scintillation Analyzer." In 2020 International Conference on Nuclear Engineering collocated with the ASME 2020 Power Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/icone2020-16143.

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Abstract In this paper, a method based on ultra-low level liquid scintillation analyzer for measuring uranium radioactivity in low-level radioactive wastewater is proposed. It can easily and quickly measure the radioactivity level of uranium in samples, and even distinguish the main isotopes of uranium. In low-level wastewater samples, if the uranium isotope has the same or similar composition and ratio to the natural uranium isotope, Comparing to the results in units of mass concentration given by laser-fluoremetry method, the liquid scintillation method can give the results in units of activ
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Reports on the topic "Isotopen"

1

Hayes, John. An Introduction to Isotopic Calculations. Woods Hole Oceanographic Insitution, 2004. http://dx.doi.org/10.1575/1912/27058.

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Fitzsimmons, Jonathan. Fishing for isotopes in the Brookhaven Lab Isotope Producer (BLIP) cooling water. Office of Scientific and Technical Information (OSTI), 2016. http://dx.doi.org/10.2172/1340357.

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Jacques, I. J., A. J. Anderson, and S. G. Nielsen. The geochemistry of thallium and its isotopes in rare-element pegmatites. Natural Resources Canada/CMSS/Information Management, 2021. http://dx.doi.org/10.4095/328983.

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The Tl isotopic and trace element composition of K-feldspar, mica, pollucite and pyrite from 13 niobium-yttrium-fluorine (NYF)-type and 14 lithium-cesium-tantalum (LCT)-type rare-element pegmatites was investigated. In general, the epsilon-205Tl values for K-feldspar in NYF- and LCT-type pegmatites increases with increasing magmatic fractionation. Both NYF and LCT pegmatites display a wide range in epsilon-205Tl (-4.25 to 9.41), which complicates attempts to characterize source reservoirs. We suggest 205Tl-enrichment during pegmatite crystallization occurs as Tl partitions between the residual
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Kidder, J. A., M. B. McClenaghan, M I Leybourne, et al. Geochemical data for stream and groundwaters around the Casino Cu-Au-Mo porphyry deposit, Yukon (NTS 115 J/10 and 115 J/15). Natural Resources Canada/CMSS/Information Management, 2022. http://dx.doi.org/10.4095/328862.

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This open file reports geochemical data for stream and groundwater samples collected around the Casino porphyry Cu-Au-Mo deposit, one of the largest and highest-grade deposits of its kind in Canada. The calc-alkaline porphyry is hosted in a Late Cretaceous quartz monzonite and associated breccias in the unglaciated region of west central Yukon. Water chemistry around the deposit was investigated because: (i) the deposit has not yet been disturbed by mining; (ii) the deposit was known to have metal-rich waters in local streams; and (iii) the deposit has atypically preserved ore zones. Stream wa
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Elam, K. R., and W. J. Reich. Determination of the theoretical feasibility for the transmutation of europium isotopes from high flux isotope reactor control cylinders. Office of Scientific and Technical Information (OSTI), 1995. http://dx.doi.org/10.2172/207579.

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Li, T., J. Parker, Y. Kuno, K. Nakatsuka, K. Kaminaga, and T. Akiyama. Determination of plutonium concentration and isotopic compositions by isotope dilution gamma-ray spectroscopy on resin beads. Office of Scientific and Technical Information (OSTI), 1990. http://dx.doi.org/10.2172/6856198.

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Myhre, Kristian, Ethan Balkin, Draguna Vrabie, and Danda Rawat. Artificial Intelligence for Isotopes: Report on the 2022 Workshop on Artificial Intelligence for Isotope R&D and Production. Office of Scientific and Technical Information (OSTI), 2023. http://dx.doi.org/10.2172/1909817.

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Matte, S., M. Constantin, and R. Stevenson. Mineralogical and geochemical characterisation of the Kipawa syenite complex, Quebec: implications for rare-earth element deposits. Natural Resources Canada/CMSS/Information Management, 2022. http://dx.doi.org/10.4095/329212.

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The Kipawa rare-earth element (REE) deposit is located in the Parautochton zone of the Grenville Province 55 km south of the boundary with the Superior Province. The deposit is part of the Kipawa syenite complex of peralkaline syenites, gneisses, and amphibolites that are intercalated with calc-silicate rocks and marbles overlain by a peralkaline gneissic granite. The REE deposit is principally composed of eudialyte, mosandrite and britholite, and less abundant minerals such as xenotime, monazite or euxenite. The Kipawa Complex outcrops as a series of thin, folded sheet imbricates located betw
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Karpius, Peter Joseph. Isotope Identification. Office of Scientific and Technical Information (OSTI), 2017. http://dx.doi.org/10.2172/1392888.

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Kingston, A. W., O. H. Ardakani, G. Scheffer, M. Nightingale, C. Hubert, and B. Meyer. The subsurface sulfur system following hydraulic stimulation of unconventional hydrocarbon reservoirs: assessing anthropogenic influences on microbial sulfate reduction in the deep subsurface, Alberta. Natural Resources Canada/CMSS/Information Management, 2022. http://dx.doi.org/10.4095/330712.

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Hydraulic fracturing is a reservoir stimulation technique that involves the injection of high-pressure fluids to enhance recovery from unconventional hydrocarbon reservoirs. Often this involves the injection of surface waters (along with additives such as biocides) into formational fluids significantly different isotopic and geochemical compositions facilitating geochemical fingerprinting of these fluid sources. In some instances, the produced fluids experience an increase in hydrogen sulfide (H2S) concentration over the course of production resulting in an increased risk to health and safety,
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