Academic literature on the topic '18O'

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Journal articles on the topic "18O"

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Pan, Jian-Jung, Boris A. Kashemirov, Joanne Lee, Charles E. McKenna, Frank J. Devlin, and Philip J. Stephens. "Electronic circular dichroism of monomethyl [16O,17O,18O]-phosphate and [16O,17O,18O]-thiophosphate revisited." Bioorganic Chemistry 38, no. 1 (2010): 7–16. http://dx.doi.org/10.1016/j.bioorg.2009.02.001.

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Barbe, Alain, Marie-Renée De Backer-Barilly, Vladimir G. Tyuterev, and Serguei A. Tashkun. "Observations of infrared bands of asymmetrical ozone isotopologues ^16O^16O^18O and ^16O^18O^18O." Applied Optics 42, no. 25 (2003): 5136. http://dx.doi.org/10.1364/ao.42.005136.

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Herwartz, Daniel, Andreas Pack, Dmitri Krylov та ін. "Revealing the climate of snowball Earth from Δ17O systematics of hydrothermal rocks". Proceedings of the National Academy of Sciences 112, № 17 (2015): 5337–41. http://dx.doi.org/10.1073/pnas.1422887112.

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The oxygen isotopic composition of hydrothermally altered rocks partly originates from the interacting fluid. We use the triple oxygen isotope composition (17O/16O, 18O/16O) of Proterozoic rocks to reconstruct the 18O/16O ratio of ancient meteoric waters. Some of these waters have originated from snowball Earth glaciers and thus give insight into the climate and hydrology of these critical intervals in Earth history. For a Paleoproterozoic [∼2.3–2.4 gigayears ago (Ga)] snowball Earth, δ18O = −43 ± 3‰ is estimated for pristine meteoric waters that precipitated at low paleo-latitudes (≤35°N). To
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Luz, Boaz, and Eugeni Barkan. "Variations of 17O/16O and 18O/16O in meteoric waters." Geochimica et Cosmochimica Acta 74, no. 22 (2010): 6276–86. http://dx.doi.org/10.1016/j.gca.2010.08.016.

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Lowe, Gordon, and Barry V. L. Potter. "Synthesis of inorganic P1-[(S)-16O, 17O, 18O]pyrophosphate." Journal of Labelled Compounds and Radiopharmaceuticals 27, no. 1 (1989): 63–73. http://dx.doi.org/10.1002/jlcr.2580270110.

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Bechtel, C., and A. Zahn. "The isotope composition of water vapour: A powerful tool to study transport and chemistry of middle atmospheric water vapour." Atmospheric Chemistry and Physics Discussions 3, no. 4 (2003): 3991–4036. http://dx.doi.org/10.5194/acpd-3-3991-2003.

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Abstract. A one-dimensional chemistry model is applied to study the stable hydrogen (D) and stable oxygen isotope (17O, 18O) composition of water vapour in stratosphere and mesosphere. The stable isotope ratios of tropospheric H2O are determined by "physical'' fractionation effects, i.e. phase changes, diffusion processes, and mixing of air masses. Due to these processes water vapour entering the stratosphere (i) is mass-dependently fractionated (MDF), i.e. shifts in the isotope ratio 17O/16O are ~0.52 times of those of 18O/16O and (ii) shows isotope shifts in D/H, which are ~5 times of those
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Arnold, John R. P., Richard C. Bethell, and Gordon Lowe. "Chiral inorganic [16O, 17O, 18O]thiophosphate: Synthesis and stereochemical analysis." Bioorganic Chemistry 15, no. 3 (1987): 250–61. http://dx.doi.org/10.1016/0045-2068(87)90023-x.

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Zahn, A., P. Franz, C. Bechtel, J. U. Grooß, and T. Röckmann. "Modelling the budget of middle atmospheric water vapour isotopes." Atmospheric Chemistry and Physics 6, no. 8 (2006): 2073–90. http://dx.doi.org/10.5194/acp-6-2073-2006.

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Abstract. A one-dimensional chemistry model is applied to study the stable hydrogen (D) and stable oxygen isotope (17O, 18O) composition of water vapour in stratosphere and mesosphere. In the troposphere, this isotope composition is determined by "physical'' fractionation effects, that are phase changes (e.g. during cloud formation), diffusion processes (e.g. during evaporation from the ocean), and mixing of air masses. Due to these processes water vapour entering the stratosphere first shows isotope depletions in D/H relative to ocean water, which are ~5 times of those in 18O/16O, and secondl
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Malová Križková, Petra, Susanne Prechelmacher, Alexander Roller, and Friedrich Hammerschmidt. "Chemical Synthesis of (RP)- and (SP)-[16O,17O,18O]Phosphoenol Pyruvate." Journal of Organic Chemistry 82, no. 19 (2017): 10310–18. http://dx.doi.org/10.1021/acs.joc.7b01783.

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Arnold, John R. P., and Gordon Lowe. "Synthesis and stereochemical analysis of chiral inorganic [16O, 17O, 18O]thiophosphate." Journal of the Chemical Society, Chemical Communications, no. 11 (1986): 865. http://dx.doi.org/10.1039/c39860000865.

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Dissertations / Theses on the topic "18O"

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Khaleel, Esra Ahmed Mohammed Adam. "Study of fusion evaporation channels in the 18O + 18O reaction at 65 MeV." Thesis, Stellenbosch : Stellenbosch University, 2011. http://hdl.handle.net/10019.1/17855.

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Devillet, F., J. M. Geets, M. Ghyoot, et al. "High power conical-shaped Niobium targets for reliable [18F-] production and lower [18O] water consumption." Helmholtz-Zentrum Dresden - Rossendorf, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:d120-qucosa-164985.

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Introduction In order to address the increasing demand for Fluorine-18 and the rising cost per mL of 18O enriched water, IBA developed improvements to their 18F- production systems. For this new design we started from scratch, with the main objectives of reducing the required enriched water volume and improving the cooling of the insert. A better cooling allows increasing the target current and thus the produced activity. Finally, we aimed to reduce the number of parts and improve the design of auxiliary components. Material and Methods Six Niobium conical inserts with different target chamber
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Silva, L., C. Hormigo, Y. Litman, et al. "Experience with top-of-foil loading [18O]water targets on an IBA 18 MeV cyclotron." Helmholtz-Zentrum Dresden - Rossendorf, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:d120-qucosa-164717.

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Introduction Liquid targets using top-of-foil loading concept have been succesfully employed for routine high current production of 18F and 13N at Cyclotope (Houston,TX), over the past ten years1,2. These targets are typically filled with 3.5 ml of water, then pressurized with helium gas at 22 bar and bombarded with 18MeV protons (70–100 µA). Average calculated saturation yield for produc-tion of 18F is ~7.8 GBq/µA (210 mCi/µA) using in-house recycled [18O]-water at approximately 93% enrichment. Reduction of beam power per unit of area is one of the advantages of a tilted entrance-foil geo-m
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Dejwakh, Navid Rene. "Using 15N, 18O, and 17O to Determine Nitrate Sources and Removal Processes from Groundwater, Tucson, Arizona." Thesis, The University of Arizona, 2008. http://hdl.handle.net/10150/193327.

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Nitrate is a common groundwater contaminant. Due to adverse health effects, waters above the Maximum Contaminant Level (MCL) of 10 mg NO3-N/L or 0.71 mmols/L, are banned from domestic consumption by the EPA. Studies have measured elevated nitrate concentrations in arid land soils and groundwater around the world. These elevated concentrations could be detrimental to the environment and to human health. Thus, it is important to consider the different sources and processes affecting nitrate concentrations Here, a novel triple isotope system approach was employed, coupling δ17O with δ18O and δ
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Stokely, Matthew Hughes. "Deployment, Testing and Analysis of Advanced Thermosyphon Target Systems for Production of Aqueous [18F]Fluoride via 18O(p,n)18F." NCSU, 2008. http://www.lib.ncsu.edu/theses/available/etd-03142008-132437/.

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Single phase and boiling batch water targets are the most common designs for the cyclotron production of 18F via the 18O(p,n)18F reaction. Thermosyphon targets have design and operating characteristics which enable higher power operation than conventional boiling targets of like size. Experimental thermosyphon target systems demonstrated the feasibility of high intensity irradiation via bottom pressurized operation. An effective experimental characterization platform was developed and utilized in parallel with computational modeling efforts to further improve designs. A control strategy was al
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Solomon, G. Cleve Taylor Hugh P. "An 18O/16O study of Mesozoic and early Tertiary granitic batholiths of the southwestern North American Cordillera /." Diss., Pasadena, Calif. : California Institute of Technology, 1989. http://resolver.caltech.edu/CaltechETD:etd-01192007-082647.

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Pajo, Leena. "UO2 fuel pellet impurities, pellet surface roughness and n(18O) /." Helsinki : University of Helsinki, 2001. http://ethesis.helsinki.fi/julkaisut/mat/kemia/vk/pajo/.

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Giral, Sylvie. "Variations des rapports isotopiques 18O/16O des kaolinites de deux profils latéritiques amazoniens : signification pour la pédologie et la paléoclimatologie." Aix-Marseille 3, 1994. http://www.theses.fr/1994AIX30026.

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La presente etude porte sur deux profils lateritique actifs (manaus et pitinga, amazonie, bresil) se developpant sur des depots sablo-argileux et sur un granite, sous climat tropical (26,5c, 2100 mm/an). Les eaux de pluies ont une composition isotopique de l'oxygene annuelle moyenne de -5,5 pour mille, et montrent de variations saisonnieres marquees. Les kaolinites de ces profils sont heterogenes par leur morphologie, taille, cristallographie, cristallochimie et leurs rapports isotopiques de l'oxygene, et ce sur au moins trois echelles: le long du profil, entre facies et a l'interieur d'un mem
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Managlia, Maria Vittoria. "Study of 18O+12,13C fusion-evaporation reactions with the GARFIELD array." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amslaurea.unibo.it/23932/.

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Non statistical effects in the emission of light charged particles from fusion-evaporation nuclear reactions are known for light and medium mass nuclei. Cases previously reported by the NUCL-EX collaboration show discrepancies between experimental data and statistical calculations in decay channels with even residues, possibly due to alpha clusterization. This thesis is focused on the analysis of an experimental campaign carried out at the Legnaro National Laboratories with the GARFIELD+RCo setup to further investigate these topics. The studied systems are: 18O+13C at 112.5 MeV and 18O+12C at
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Adami, Laurien. "Caracterização dos vinhos Merlot e Cabernet Sauvignon da serra gaúcha através de determinação das razões isotópicas 13C/12C e 18O/16O." reponame:Repositório Institucional da UCS, 2006. https://repositorio.ucs.br/handle/11338/198.

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Neste trabalho foram estudados vinhos provenientes de microvinificações das variedades Merlot e Cabernet Sauvignon das sub-regiões de Pinto Bandeira, Vale dos Vinhedos, Nova Pádua e Monte Belo do Sul, nas safras de 2005 e 2006. Foram determinadas as razões isotópicas 13C/12C do etanol e 18O/16O da água e do etanol, buscando possível diferenciação entre as variedades e safras de produção, e provável relação entre o local de origem e suas características geográficas (altitude e latitude) e climatológicas (temperatura, precipitação pluviométrica e umidade). Utilizou-se um espectrômetro de massas
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Books on the topic "18O"

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Stoicheia physikēs philosophias: Ho hellēnikos epistēmonikos stochasmos ton 17o kai 18o aiōna. Ekdoseis Gutenberg, 2013.

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Svorōnos, Nikos G. To emporio tēs Thessalonikēs ton 18o aiōna. Themelio, 1996.

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Hajialamdari, Mojtaba. Crystal growth, Raman scattering and optical properties of the superconductor Cd2Re2O7(16O, 18O). Brock University, Dept. of Physics, 2008.

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Kitromilides, Paschalis. Iōsēpos Moisiodax: Hoi syntetagmenes tēs Valkanikēs skepsēs ton 18o aiōna. Morphōtiko Hidryma Ethnikēs Trapezēs, 1985.

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Kitromilides, Paschalis. Iōsēpos Moisiodax: Hoi syntetagmenes tēs Valkanikēs skepsēs ton 18o aiōna. Morphōtiko Hidryma Ethnikēs Trapezēs, 1985.

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Anoyatis-Pelé, Dimitris. Dromoi kai diakinēsē ston Helladiko chōro kata ton 18o aiōna. Ekdoseis Papazēsē AEVE, 1993.

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Panagiōtounēs, Panos N. Epitomē historia Neoellēnikou theatrou: Apo ton 18o ston 20o aiōna. Scholē Staurakou, 1993.

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Sternhell, Zeev. Ho anti-diaphōtismos: Apo ton 18o aiōna hōs ton psychro polemo. Polis, 2009.

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Brazil) Encontro Nacional dos Juízes Federais (18th 2001 Campos do Jordão. 18o Encontro Nacional dos Juízes Federais do Brasil: Anais do seminário. AJUFE, Associação dos Juízes Federais do Brasil, 2006.

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Balamote, Phane. Oi vryses tou Metsovou: (apo tou 18o aio na mechri se mera). Ekd. Oikos Apho n Kyriakide, 1989.

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Book chapters on the topic "18O"

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Guelachvili, G., and K. Narahari Rao. "Data, 16O-12C-17O to 18O-14C-18O." In Linear Triatomic Molecules - OCO. Part b. Springer Berlin Heidelberg, 1997. http://dx.doi.org/10.1007/10542729_2.

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Ye, Xiaoying, King C. Chan, DaRue A. Prieto, et al. "Trypsin-Mediated 18O/16O Labeling for Biomarker Discovery." In Methods in Molecular Biology. Humana Press, 2013. http://dx.doi.org/10.1007/978-1-62703-360-2_12.

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Mureşan, Vlad, Iulia Clitan, Valentin Sita, Mihail Abrudean, and Mihaela-Ligia Ungureşan. "18O Isotope Separation Process Control." In Informatics in Control, Automation and Robotics. Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-31993-9_26.

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Winkelmann, Jochen. "Self-diffusion coefficient of water-(18O)." In Diffusion in Gases, Liquids and Electrolytes. Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-540-73735-3_312.

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Schwartz, Egbert. "Stable Isotope Probing Techniques Using H2 18O." In Stable Isotope Probing and Related Technologies. ASM Press, 2014. http://dx.doi.org/10.1128/9781555816896.ch6.

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Winkelmann, Jochen. "Diffusion coefficient of water-(18O) in water." In Diffusion in Gases, Liquids and Electrolytes. Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-540-73735-3_1079.

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Rodriguez-Casado, A., M. Molina, P. Carmona, and R. Escobar. "Infrared Spectroscopic Study of 18O(6)-Guanosbve." In Spectroscopy of Biological Molecules: Modern Trends. Springer Netherlands, 1997. http://dx.doi.org/10.1007/978-94-011-5622-6_96.

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Winkelmann, Jochen. "Diffusion coefficient of water-18O in water." In Diffusion in Gases, Liquids and Electrolytes. Springer Berlin Heidelberg, 2018. http://dx.doi.org/10.1007/978-3-662-54089-3_1295.

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VanBrocklin, Henry F., Henry C. Padgett, C. William Alvord, Derrick G. Schmidt, and Gerald T. Bida. "High Pressure H2 18O Target for the Production of [18F]Fluoride Ion." In Chemists’ Views of Imaging Centers. Springer US, 1995. http://dx.doi.org/10.1007/978-1-4757-9670-4_37.

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McHale, A. E., J. A. Kilner, and B. C. H. Steele. "Determination of Oxygen Diffusivities in β And β″ Alumina By 18O/16O Exchange." In Transport in Nonstoichiometric Compounds. Springer US, 1985. http://dx.doi.org/10.1007/978-1-4613-2519-2_17.

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Conference papers on the topic "18O"

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Sherman, N. K., W. F. Davidson, S. Raman, W. Delbianco, and G. Kajrys. "Comparison of photoabsorption by 16O and 18O." In AIP Conference Proceedings Volume 125. AIP, 1985. http://dx.doi.org/10.1063/1.35022.

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Sita, Valentin, Vlad Mureşan, Mihail Abrudean, Mihaela-Ligia Ungureşan, and Iulia Clitan. "18O Isotope Concentration Control." In 15th International Conference on Informatics in Control, Automation and Robotics. SCITEPRESS - Science and Technology Publications, 2018. http://dx.doi.org/10.5220/0006877403690379.

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Sita, Valentin, Vlad Mureşan, Mihail Abrudean, Mihaela-Ligia Ungureşan, and Iulia Clitan. "18O Isotope Concentration Control." In 15th International Conference on Informatics in Control, Automation and Robotics. SCITEPRESS - Science and Technology Publications, 2018. http://dx.doi.org/10.5220/0006877403790389.

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Burjan, V., Z. Hons, V. Kroha, et al. "The 18O(d,p)19O reaction and the ANC method." In SEVENTH EUROPEAN SUMMER SCHOOL ON EXPERIMENTAL NUCLEAR ASTROPHYSICS: Proceedings of the 7th European Summer School on Experimental Nuclear Astrophysics. AIP Publishing LLC, 2014. http://dx.doi.org/10.1063/1.4875304.

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Cavallaro, M., A. Agodi, M. Bondì, et al. "Two-neutron stripping in (18O, 16O) and (t,p) reactions." In XXXVI BRAZILIAN WORKSHOP ON NUCLEAR PHYSICS. AIP Publishing LLC, 2014. http://dx.doi.org/10.1063/1.4901761.

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Cappuzzello, F., A. Agodi, M. Bondì, et al. "The (18O, 16O) reaction as a probe for nuclear spectroscopy." In XXXVI BRAZILIAN WORKSHOP ON NUCLEAR PHYSICS. AIP Publishing LLC, 2014. http://dx.doi.org/10.1063/1.4901762.

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Cavallaro, M., C. Agodi, M. Bondì, et al. "(18O,>16O) Two-neutron transfer reactions for spectroscopic studies." In XXXV BRAZILIAN WORKSHOP ON NUCLEAR PHYSICS. AIP, 2013. http://dx.doi.org/10.1063/1.4807466.

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Bondí, M., F. Cappuzzello, C. Agodi, et al. "(18O,18Ne) double charge-exchange with MAGNEX." In SEVENTH EUROPEAN SUMMER SCHOOL ON EXPERIMENTAL NUCLEAR ASTROPHYSICS: Proceedings of the 7th European Summer School on Experimental Nuclear Astrophysics. AIP Publishing LLC, 2014. http://dx.doi.org/10.1063/1.4875323.

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Muresan, Vlad, Mihail Abrudean, Mihaela-Ligia Unguresan, Iulia Clitan, and Tiberiu Colosi. "Control of the 18O isotope separation process." In 2016 IEEE 11th International Symposium on Applied Computational Intelligence and Informatics (SACI). IEEE, 2016. http://dx.doi.org/10.1109/saci.2016.7507386.

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Muresan, Vlad, Mihail Abrudean, Mihaela-Ligia Unguresan, Iulia Clitan, and Tiberiu Colosi. "Modeling of the 18O isotope separation process." In 2016 IEEE International Conference on Automation, Quality and Testing, Robotics (AQTR). IEEE, 2016. http://dx.doi.org/10.1109/aqtr.2016.7501388.

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Reports on the topic "18O"

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Morrison, Jack, and Roberta Mulford. Effects of 18O Exchange on Neutron Emission Rates of Aging 238PuO2 LWRHUs. Office of Scientific and Technical Information (OSTI), 2021. http://dx.doi.org/10.2172/1813829.

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Kontak, D. J., A. M. McDonald, R. Poulin, J. Petrus, and M B McClenaghan. Scheelite as a possible ore-deposit discriminator based on luminescence, trace-element chemistry, delta-18O signature, fluid inclusions, and U-Pb geochronology. Natural Resources Canada/ESS/Scientific and Technical Publishing Services, 2017. http://dx.doi.org/10.4095/306315.

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Esch, R. A. Tank 241-S-106, cores 183, 184 and 187 analytical results for the final report. Office of Scientific and Technical Information (OSTI), 1997. http://dx.doi.org/10.2172/328503.

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Paradis, S., G. J. Simandl, N. Drage, R J D'Souza, D. J. Kontak, and Z. Waller. Carbonate-hosted deposits (Mississippi Valley-type, magnesite, and REE-F-Ba) of the southeastern Canadian Cordillera: a review and isotopic data comparison. Natural Resources Canada/CMSS/Information Management, 2022. http://dx.doi.org/10.4095/327995.

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The Mississippi Valley-type, magnesite, and REE-F-Ba deposits in the southeastern Canadian Cordillera are in the weakly deformed/metamorphosed Paleozoic carbonate platform of the Rocky Mountains. Most are hosted in dolostones of the middle Cambrian Cathedral, upper Cambrian Jubilee, and Upper Devonian Palliser formations and spatially associated with hydrothermal dolomite. They occur along structurally controlled facies transitions between the shallow-water carbonate platform and deeper water basin rocks of the Paleozoic continental margin. Their location and morphology reflect episodic riftin
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Carpenter, M. P., I. Ahmad, and B. Crowell. Lifetimes of high-spin states in {sup 180-184}Pt. Office of Scientific and Technical Information (OSTI), 1995. http://dx.doi.org/10.2172/166332.

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Batcheller, Thomas Aquinas. Tank Farm WM-182 and WM 183 Heel Slurry Samples PSD Results. Office of Scientific and Technical Information (OSTI), 2000. http://dx.doi.org/10.2172/911468.

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Batcheller, T. A., and G. M. Huestis. Tank Farm WM-182 and WM-183 Heel Slurry Samples PSD Results. Office of Scientific and Technical Information (OSTI), 2000. http://dx.doi.org/10.2172/776433.

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Steen, F. H. Tank 241-T-112, cores 185 and 186 analytical results for the final report. Office of Scientific and Technical Information (OSTI), 1997. http://dx.doi.org/10.2172/328505.

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Kindley, David. EA 18G Growler Aircraft (EA 18G). Defense Technical Information Center, 2015. http://dx.doi.org/10.21236/ad1019143.

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Morley, Frank. EA-18G Growler Aircraft (EA-18G). Defense Technical Information Center, 2013. http://dx.doi.org/10.21236/ada613348.

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