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Littérature scientifique sur le sujet « Isotopic model »

Auteur : Grafiati

Publié le 10 mars 2023

Mis à jour le 31 juillet 2025

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Articles de revues sur le sujet "Isotopic model"

Sedaghatpour, Fatemeh, and Stein B. Jacobsen. "Magnesium stable isotopes support the lunar magma ocean cumulate remelting model for mare basalts." Proceedings of the National Academy of Sciences 116, no. 1 (2018): 73–78. http://dx.doi.org/10.1073/pnas.1811377115.

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We report high-precision Mg isotopic analyses of different types of lunar samples including two pristine Mg-suite rocks (72415 and 76535), basalts, anorthosites, breccias, mineral separates, and lunar meteorites. The Mg isotopic composition of the dunite 72415 (δ25Mg = −0.140 ± 0.010‰, δ26Mg = −0.291 ± 0.018‰), the most Mg-rich and possibly the oldest lunar sample, may provide the best estimate of the Mg isotopic composition of the bulk silicate Moon (BSM). This δ26Mg value of the Moon is similar to those of the Earth and chondrites and reflects both the relative homogeneity of Mg isotopes in

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Sturm, C., Q. Zhang, and D. Noone. "An introduction to stable water isotopes in climate models: benefits of forward proxy modelling for paleoclimatology." Climate of the Past Discussions 5, no. 3 (2009): 1697–729. http://dx.doi.org/10.5194/cpd-5-1697-2009.

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Abstract. Stable water isotopes have been measured in a wide range of climate archives, with the purpose of reconstructing regional climate variations. Yet the common assumption that the isotopic signal is a direct indicator of temperature proves to be misleading under certain circumstances, since its relationship with temperature also depends on e.g. atmospheric circulation and precipitation seasonality. The present article introduces the principles, benefits and caveats of using climate models with embedded water isotopes as a support for the interpretation of isotopic climate archives. A sh

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Cauquoin, Alexandre, Martin Werner, and Gerrit Lohmann. "Water isotopes – climate relationships for the mid-Holocene and preindustrial period simulated with an isotope-enabled version of MPI-ESM." Climate of the Past 15, no. 6 (2019): 1913–37. http://dx.doi.org/10.5194/cp-15-1913-2019.

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Abstract. We present here the first results, for the preindustrial and mid-Holocene climatological periods, of the newly developed isotope-enhanced version of the fully coupled Earth system model MPI-ESM, called hereafter MPI-ESM-wiso. The water stable isotopes H216O, H218O and HDO have been implemented into all components of the coupled model setup. The mid-Holocene provides the opportunity to evaluate the model response to changes in the seasonal and latitudinal distribution of insolation induced by different orbital forcing conditions. The results of our equilibrium simulations allow us to

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Lu, Yanwei, Mingyi Wen, Peiyue Li, Jiaping Liang, Haoyan Wei, and Min Li. "An Improved Craig–Gordon Isotopic Model: Accounting for Transpiration Effects on the Isotopic Composition of Residual Water during Evapotranspiration." Agronomy 13, no. 6 (2023): 1531. http://dx.doi.org/10.3390/agronomy13061531.

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Evapotranspiration (ET) is a crucial process in the terrestrial water cycle, and understanding its stable isotopic evolution is essential for comprehending hydrological processes. The Craig–Gordon (C-G) model is widely used to describe isotopic fractionation during pure evaporation. However, in natural environments, ET involves both transpiration (T) and evaporation (E), and the traditional C-G model does not account for the effect of transpiration on isotopic fractionation. To address this gap, we propose the evapotranspiration-unified C-G (ET-UCG) model, which extends the C-G model by incorp

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Halder, J., S. Terzer, L. I. Wassenaar, L. J. Araguás-Araguás, and P. K. Aggarwal. "The Global Network of Isotopes in Rivers (GNIR): integration of water isotopes in watershed observation and riverine research." Hydrology and Earth System Sciences 19, no. 8 (2015): 3419–31. http://dx.doi.org/10.5194/hess-19-3419-2015.

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Abstract. We introduce a new online global database of riverine water stable isotopes (Global Network of Isotopes in Rivers, GNIR) and evaluate its longer-term data holdings. Overall, 218 GNIR river stations were clustered into three different groups based on the seasonal variation in their isotopic composition, which was closely coupled to precipitation and snowmelt water runoff regimes. Sinusoidal fit functions revealed phases within each grouping and deviations from the sinusoidal functions revealed important river alterations or hydrological processes in these watersheds. The seasonal isot

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Halder, J., S. Terzer, L. I. Wassenaar, L. J. Araguás-Araguás, and P. K. Aggarwal. "The Global Network of Isotopes in Rivers (GNIR): integration of water isotopes in watershed observation and riverine research." Hydrology and Earth System Sciences Discussions 12, no. 4 (2015): 4047–79. http://dx.doi.org/10.5194/hessd-12-4047-2015.

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Abstract. We introduce a new online global database of riverine water stable isotopes (Global Network of Isotopes in Rivers) and evaluate its longer-term data holdings. Overall, 218 GNIR river stations were clustered into 3 different groups based on the seasonal variation in their isotopic composition, which was closely coupled to precipitation and snow-melt water run-off regimes. Sinusoidal fit functions revealed periodic phases within each grouping and deviations from the sinusoidal functions revealed important river alterations or hydrological processes in these watersheds. The seasonal iso

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Salamalikis, Vasileios, та Athanassios A. Argiriou. "Validation and Bias Correction of Monthly δ18O Precipitation Time Series from ECHAM5-Wiso Model in Central Europe". Oxygen 2, № 2 (2022): 109–24. http://dx.doi.org/10.3390/oxygen2020010.

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Simulated stable oxygen isotopic composition (δ18O) of precipitation from isotope-enabled GCMs (iGCMs) have gained significant visibility nowadays. This study evaluates bias correction techniques to reduce the systematic and dispersion biases of the modelled δ18O by the ECHAM5-wiso model compared to the Global Network of Isotopes in Precipitation (GNIP) observations over Central Europe. mean bias error (MBE) and Root Mean Square Error (RMSE) are substantially reduced by more than 70% and 10%, respectively, depending on the bias correction scheme, with better results for Generalized Additive Mo

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Michalski, G., S. K. Bhattacharya, and G. Girsch. "NO<sub>x</sub> cycle and the tropospheric ozone isotope anomaly: an experimental investigation." Atmospheric Chemistry and Physics 14, no. 10 (2014): 4935–53. http://dx.doi.org/10.5194/acp-14-4935-2014.

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Abstract. The oxygen isotope composition of nitrogen oxides (NOx) in the atmosphere is a useful tool for understanding the oxidation of NOx into nitric acid / nitrate in the atmosphere. A set of experiments was conducted to examine change in isotopic composition of NOx due to NOx–O2–O3 photochemical cycling. At low NOx / O2 mixing ratios, NOx became progressively and nearly equally enriched in 17O and 18O over time until it reached a steady state with Δ17O values of 39.3 ± 1.9‰ and δ18O values of 84.2 ± 4‰, relative to the isotopic composition of the initial O2 gas. As the mixing ratios were i

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Orlowski, Natalie, Philipp Kraft, Jakob Pferdmenges, and Lutz Breuer. "Exploring water cycle dynamics by sampling multiple stable water isotope pools in a developed landscape in Germany." Hydrology and Earth System Sciences 20, no. 9 (2016): 3873–94. http://dx.doi.org/10.5194/hess-20-3873-2016.

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Abstract. A dual stable water isotope (δ2H and δ18O) study was conducted in the developed (managed) landscape of the Schwingbach catchment (Germany). The 2-year weekly to biweekly measurements of precipitation, stream, and groundwater isotopes revealed that surface and groundwater are isotopically disconnected from the annual precipitation cycle but showed bidirectional interactions between each other. Apparently, snowmelt played a fundamental role for groundwater recharge explaining the observed differences to precipitation δ values. A spatially distributed snapshot sampling of soil water iso

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Erez, Jonathan, Anne Bouevitch, and Aaron Kaplan. "Carbon isotope fractionation by photosynthetic aquatic microorganisms: experiments with Synechococcus PCC7942, and a simple carbon flux model." Canadian Journal of Botany 76, no. 6 (1998): 1109–18. http://dx.doi.org/10.1139/b98-067.

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Stable carbon isotopes (12C and 13C) are widely used to trace biogeochemical processes in the global carbon cycle. Natural fractionation of carbon isotopes is mainly due to the discrimination of ribulose-1,5-bisphosphate carboxylase-oxygenase (Rubisco) against 13C during photosynthesis. In marine and other aquatic microorganisms, this fractionation is lowered when the dissolved CO2 (CO2(aq)) is decreasing, but the underlying mechanisms are poorly understood. Cultured Synechococcus PCC7942 showed maximum isotopic fractionations of -33omicron (in delta 13C units) relative to the total inorganic

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Thèses sur le sujet "Isotopic model"

Fomchenko, Anna. ""Expanded" local mode approach and isotopic effect in polyatomic molecules." Thesis, Dijon, 2014. http://www.theses.fr/2014DIJOS036/document.

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Dans cette thèse, sur la base de l'approche du mode local "étendu" et de la théorie générale de la substitution isotopique, nous obtenons un ensemble de relations analytiques simples entre les paramètres spectrocopiques (fréquences harmoniques, coefficients d'anharmonicité, paramètres rovibrationels, différents types de paramètres d'interaction de Fermi et de Coriolis) des molécules de CH2D2, CH3D et CHD3. Tous ces paramètres sont exprimés en termes de relations simples à partir des paramètres spectroscopiques de la molécule mère CH4. Des calculs tests avec des relations isotopiques montrent q

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Burk, David Edward. "Forward model calculations for determining isotopic compositions of materials used in a radiological dispersal device." Texas A&M University, 2005. http://hdl.handle.net/1969.1/2366.

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In the event that a radiological dispersal device (RDD) is detonated in the U.S. or near U.S. interests overseas, it will be crucial that the actors involved in the event can be identified quickly. If irradiated nuclear fuel is used as the dispersion material for the RDD, it will be beneficial for law enforcement officials to quickly identify where the irradiated nuclear fuel originated. One signature which may lead to the identification of the spent fuel origin is the isotopic composition of the RDD debris. The objective of this research was to benchmark a forward model methodology for predic

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De, Lurio Jennifer Lynn. "Paleoclimatic significance of glendonite pseudomorphs in the early cretaceous of the Eromanga Basin, Australia : a geochemical and isotopic model /." Title page, abstract and contents only, 1995. http://web4.library.adelaide.edu.au/theses/09SB/09sbd366.pdf.

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Thesis (B. Sc.(Hons.))--University of Adelaide, Dept. of Geology and Geophysics, 1995.<br>Australian National Grid reference SH/54-5 Marree sheet 1:250000. Includes bibliographical references (leaves 40-54).

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Shipley, Niccole Kiyomi. "Isotopic and Petrologic Investigation and Model of Genesis of Large-Volume High-Silica Rhyolites in Arc Environments: Karymshina Caldera, Kamchatka, Russia." Thesis, University of Oregon, 2011. http://hdl.handle.net/1794/12187.

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xii, 76 p. ： ill. (some col.)<br>Large-volume calderas are responsible for producing large deposits of rhyolite and high-silica rhyolite, but the mechanisms by which these deposits are produced are still poorly understood. The Kamchatka Peninsula of Russia contains several large calderas and is one of the most volcanically active areas on Earth. Karymshina Caldera, the largest (25 km x 15 km) caldera in Kamchatka, produced an estimated 800 km 3 of high-silica rhyolitic ignimbrites and post-caldera extrusions, which erupted 1.78 and 0.5-0.8 Ma, respectively. SiO2 content ranges from 66.27-71

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Fusetti, Luc. "Elaboration of a kinetic model in order to predict the molecular and isotopic composition of natural gas generated during the thermal cracking of hydrocarbons." Thesis, Curtin University, 2009. http://hdl.handle.net/20.500.11937/2088.

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The scope of the present study was to validate an approach that could be used to elaborate a model that would predict the δ[superscript]13C of the gases generated during thermal cracking of oil. The attention was focused on C[subscript]14- methylaromatics and alkylaromatics but the entire methodology was demonstrated on one component i.e. 1,2,4-trimethylbenzene.Pyrolysis experiments at temperatures of 395, 425, 450, and 475 °C and at a pressure of 100 bar were performed in order to study the whole range of conversions. All pyrolysis fractions were recovered and quantified. All identified produ

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Köten, Muharrem [Verfasser]. "An improved efficiency model for ACE-SWICS : determination of the carbon isotopic ratio 13C, 12C in the solar wind from ACE-SWICS measurements / Muharrem Köten." Kiel : Universitätsbibliothek Kiel, 2009. http://d-nb.info/1019812788/34.

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Calippo, Flávio Rizzi. "Sociedade sambaquieira, comunidades marítimas." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/71/71131/tde-23062010-160307/.

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Tendo como referencial teórico abordagens focadas na Arqueologia Marítima (MUCKELROY, 1978; ADAMS, 1998, 2002), na Antropologia Marítima (MALINOWSKI, 1986 [1922]; DIEGUES, 1998) e em estudos de Percepção Ambiental (INGOLD, 2000), buscou-se desenvolver e testar a hipótese de que, embora houvesse uma unidade cultural que permitisse o estabelecimento de uma ampla sociedade sambaquieira, os povos dos sambaquis estariam organizados em comunidades costeiras regionais, as quais teriam se desenvolvido e se organizado em diferentes comunidades marítimas, costeiras e fluviais, em conseqüência dos difere

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Di, Hong J. "Application of isotopic dilution methods to the study of the dissolution of phosphate fertilisers of differing solubility in the soil." Lincoln University, 1991. http://hdl.handle.net/10182/1792.

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An injection technique, in which undisturbed soil cores are labelled with ³²P to study dissolution of phosphate fertilisers in the soil, was evaluated in field and glasshouse trials. When ³²P was injected between 0-150 mm depths of the undisturbed soil columns and fertilisers applied at the surface, the amounts of fertiliser P dissolved, as measured by the increases in the exchangeable P pools, were overestimated. Three possible reasons were suggested: (i) the interaction between surface-applied fertiliser, ³²P injected through the whole soil column, and the vertical decline in root density, (

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King, Adam C. "The Cressbrook Creek alluvial aquifer system, Southeast Queensland : hydrochemistry and isotopes to determine hydrological processes and response to floods." Thesis, Queensland University of Technology, 2014. https://eprints.qut.edu.au/78443/1/Adam_King_Thesis.pdf.

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This study developed an understanding of hydrological processes within the Cressbrook Creek catchment of the upper Brisbane River, in particular for the alluvial aquifers. Those aquifers within the lower catchment are used for intensive irrigation, and have been impacted by long-term drought followed by flooding. The study utilised water chemistry, isotopic characters and hydraulic measurements to determine factors such as recharge, links between creeks and groundwater, and variations in water quality. The catchment-wide study will enable improved management of the local water resources.

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Delavau, Carly J. "Development of precipitation δ18O isoscapes for Canada and application within a tracer-aided hydrological model". Taylor and Francis, American Geophysical Union, 2015. http://hdl.handle.net/1993/31946.

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Delineating spatial patterns of precipitation isotopes (“isoscapes”) is important for studies including the hydrology of terrestrial systems, present and past interpretations of climate, and tracer-aided hydrological modelling, among others. However, the extent to which precipitation isoscapes can be predicted across Canada has not been fully articulated. This thesis combines isotopes in precipitation (δ18Oppt) observations from two regional and one global network to create long term and time series precipitation isoscapes for Canada and the northern United States. Multi-linear regressions of

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Livres sur le sujet "Isotopic model"

Poli͡achenko, A. L. Chislennye metody v i͡adernoĭ geofizike. Ėnergoatomizdat, 1987.

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Thorstenson, Donald C. Calculation of individual isotope equilibrium constants for implementation in geochemical models. U.S. Dept. of the Interior, U.S. Geological Survey, 2002.

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1948-, Bassett R. L., Woodhouse E. G, and U.S. Nuclear Regulatory Commission. Office of Nuclear Regulatory Research. Division of Regulatory Applications., eds. Field studies at the Apache Leap Research Site in support of alternative conceptual models. Division of Regulatory Applications, Office of Nuclear Regulatory Research, U.S. Nuclear Regulatory Commission, 1997.

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Okazaki, Atsushi. Development of stable water isotope incorporated atmosphere-land coupled model and comparison with climate proxies. Division of Climate System Research, Atmosphere and Ocean Research Institute, The University of Tokyo, 2018.

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Hirose, Akira. Anomalous electron thermal diffusivity, anomalous particle pinch and isotope effect due to the skin size electromagnetic drift mode. University of Saskatchewan, Plasma Physics Laboratory, 1990.

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Duffield, Wendell A. A model to help explain Sr-isotope disequilibrium between feldspar phenocrysts and melt in large-volume silicic magma systems. U.S. Dept. of the Interior, U.S. Geological Survey, 1994.

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Kelly, Brian P. Ground-water flow simulation and chemical and isotopic mixing equation analysis to determine source contributions to the Missouri River alluvial aquifer in the vicinity of the Independence, Missouri, well field. U.S. Dept. of the Interior, U.S. Geological Survey, 2002.

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Chapitres de livres sur le sujet "Isotopic model"

Champion, David C., and David L. Huston. "Applications of Neodymium Isotopes to Ore Deposits and Metallogenic Terranes; Using Regional Isotopic Maps and the Mineral Systems Concept." In Isotopes in Economic Geology, Metallogenesis and Exploration. Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-27897-6_5.

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AbstractAlthough radiogenic isotopes historically have been used in ore genesis studies for age dating and as tracers, here we document the use of regional- and continental-scale Sm–Nd isotope data and derived isotopic maps to assist with metallogenic interpretation, including the identification of metallogenic terranes. For the Sm–Nd system, calculated Nd model ages, which are time independent, are of most value for small-scale isotopic maps. Typically, one- or two-stage depleted mantle model ages (TDM, T2DM) are used to infer age when the isotope characteristics of the rock were in isotopic

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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

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Göhring, Andrea, Gisela Grupe, and Peer Kröger. "Application of Gaussian Mixture Model Clustering for the Resolution of Multi-isotope Fingerprints." In Isotopic Proveniencing and Mobility. Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-25722-3_9.

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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 operat

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Söllner, Frank, Anita Toncala, Stefan Hölzl, and Gisela Grupe. "Determination of Geo-dependent Bioavailable 87Sr/86Sr Isotopic Ratios for Archaeological Sites from the Inn Valley (Austria): A Model Calculation." In Isotopic Landscapes in Bioarchaeology. Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-662-48339-8_7.

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Ingraham, Neil L., and Richard G. Craig. "Constraining Estimates of Evapotranspiration With Hydrogen Isotopes in a Seasonal Orographic Model." In Climate Change in Continental Isotopic Records. American Geophysical Union, 2013. http://dx.doi.org/10.1029/gm078p0047.

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Huston, David L., Robert B. Trumbull, Georges Beaudoin, and Trevor Ireland. "Light Stable Isotopes (H, B, C, O and S) in Ore Studies—Methods, Theory, Applications and Uncertainties." In Isotopes in Economic Geology, Metallogenesis and Exploration. Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-27897-6_8.

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AbstractVariations in the abundances of light stable isotopes, particularly those of hydrogen, boron, carbon, oxygen and sulfur, were essential in developing mineralization models. The data provide constraints on sources of hydrothermal fluids, carbon, boron and sulfur, track interaction of these fluids with the rocks at both the deposit and district scales, and establish processes of ore deposition. In providing such constraints, isotopic data have been integral in developing genetic models for porphyry-epithermal, volcanic-hosted massive sulfide, orogenic gold, sediment-hosted base metal and

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Huston, David L., and David C. Champion. "Applications of Lead Isotopes to Ore Geology, Metallogenesis and Exploration." In Isotopes in Economic Geology, Metallogenesis and Exploration. Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-27897-6_6.

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AbstractAlthough lead isotopes are most commonly used to date geological events, including mineralizing events, they also can provide information on many aspects of metallogeny and can be directly used in mineral exploration. Lead isotope data are generally reported as ratios of radiogenic isotopes normalized to the non-radiogenic isotope 204Pb (e.g. 206Pb/204Pb, 207Pb/204Pb and 208Pb/204Pb). These ratios can be used in exploration to characterize the style of mineralization, metal (i.e. Pb) source and as vectors to ore. When combined with lead isotope evolution models, the data can be used to

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Huston, David L., Ian Lambert, and Jens Gutzmer. "Isotopes in Economic Geology, Metallogeny and Exploration—An Introduction." In Isotopes in Economic Geology, Metallogenesis and Exploration. Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-27897-6_1.

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AbstractAlthough (Soddy, Nature 92:399–400, 1913) inferred the existence of isotopes early last century, it was not until the discovery of the neutron by (Chadwick, Nature 129:312, 1932) that isotopes were understood to result from differing numbers of neutrons in atomic nuclei. (Urey, J Chem Soc 1947:562–581, 1947) predicted that different isotopes would behave slightly differently in chemical (and physical) reactions due to mass differences, leading to the concept of isotopic fractionation. The discovery that some elements transformed into other elements by radioactive decay happened even be

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Actes de conférences sur le sujet "Isotopic model"

Müllhäuser, Mario, and Miles Barnett. "Development Of A Generic Test For Transient Recovery Handling From Helicopter Active Inceptor System Failures To A Near-Zero Control Force Condition." In Vertical Flight Society 71st Annual Forum & Technology Display. The Vertical Flight Society, 2015. http://dx.doi.org/10.4050/f-0071-2015-10290.

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In the event of an aircraft's cyclic Active Inceptor System (AIS) failure, causing sudden loss of actively generated control forces, its flight control mechanical characteristics (FCMC) would degrade to the system's inherent, near-zero force characteristics (the isotonic mode). In this degraded mode the pilot would have to recover the control of the aircraft and then land the aircraft safely. In order to mitigate the risks associated with this failure and to optimise the inherent FCMC and augmentation laws for improved handling qualities (HQ), a standardised and generic test that incorporated

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Arbuzov, Boris A. "HERA high Q2 events as indications of excited leptons with weak isotopic spin 3/2." In Beyond the standard model. American Institute of Physics, 1997. http://dx.doi.org/10.1063/1.54500.

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Travis, J. C., T. B. Lucatorto, J. Wen, J. D. Fassett, and C. W. Clark. "Doppler-Free Resonance Ionization Mass Spectrometry of Beryllium." In Laser Applications to Chemical Analysis. Optica Publishing Group, 1987. http://dx.doi.org/10.1364/laca.1987.tub2.

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As originally conceived, resonance ionization mass spectrometry (RIMS) combined the elemental selectivity of resonance ionization (1) with the isotopic selectivity of mass spectrometry to improve the accuracy and sensitivity of conventional mass spectrometry (2). For many applications, especially quantitation by isotope dilution (3) , it is important that no isotopic selectivity accompany the resonance ionization process. This condition is easily met for all but a few elements of the periodic table (4), since the great majority of optical isotope shifts are small with respect to typical dye la

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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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Lee, Hyojeong, Lan Zhao, Gabriel J. Bowen, et al. "Enabling online geospatial isotopic model development and analysis." In the 2011 TeraGrid Conference. ACM Press, 2011. http://dx.doi.org/10.1145/2016741.2016783.

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Zhang, Weijian, Haiyan Xiao, Jingang Liang, Ruihan Li, and Liguo Zhang. "Isotopic Measurement of HTR-10 Irradiated Fuels Based on Anti-Compton Gamma Spectroscopic Method." In 2024 31st International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2024. http://dx.doi.org/10.1115/icone31-132758.

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Abstract Accurate determination of isotopic compositions of irradiated fuel elements plays a critical role in assessing fuel burnup, optimizing reactor performance, and ensuring safe operations. Spherical fuel elements are used in pebble-bed HTGRs (High Temperature Gas-cooled Reactors) such as HTR-10 and HTR-PM. However, there is almost no isotopic measurement of such fuels in the open literature, which has seriously limited the optimization of fuel management practices for HTGR systems. Recently, an isotopic measurement experiment of two irradiated HTR-10 fuels is carried out in China using g

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Gropp, Jonathan, Gunter Wegener, Heidi Taubner, Marcus Elvert, and Itay Halevy. "Explaining sulfate-driven isotope effects in anaerobic oxidation of methane using a metabolic-isotopic model." In Goldschmidt2021. European Association of Geochemistry, 2021. http://dx.doi.org/10.7185/gold2021.5370.

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Netesova, Nadezhda P. "Oscillation electron model superconductors: phase diagram, temperature transition, isotopic shift." In Oxide-based Materials and Devices IX, edited by Ferechteh H. Teherani, David C. Look, and David J. Rogers. SPIE, 2018. http://dx.doi.org/10.1117/12.2293081.

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Qiao, Jianshu, and Dongli Huang. "Investigation on Isotopic Depletion Validation and Uncertainty Analysis With Kalman Filtering." In 2024 31st International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2024. http://dx.doi.org/10.1115/icone31-134428.

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Abstract Isotopic concentration is one of the essential indicators to evaluate the burnup process, which provides detailed descriptions of fuel assembly status among various reactor core conditions. This work aims to develop a method in support of isotopic depletion validation. The developed validation method attempts to improve predictions of isotopic concentration across burnup fusing the computational results from a high-fidelity model with a small amount of measurement data. The isotopic predictions are improved by minimizing the discrepancies between the model prediction and the reality,

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Chen, Yunfei, Guodong Wang, Deyu Li, and Jennifer R. Lukes. "Thermal Expansion and Isotopic Composition Effects on Lattice Thermal Conductivities of Crystalline Silicon." In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-13870.

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Equilibrium molecular dynamics simulation is used to calculate lattice thermal conductivities of crystal silicon in the temperature range from 400K to 1600K. Simulation results confirmed that thermal expansion, which resulted in the increase of the lattice parameter, caused the decrease of the lattice thermal conductivity. The simulated results proved that thermal expansion imposed another type resistance on phonon transport in crystal materials. Isotopic and vacancy effects on lattice thermal conductivity are also investigated and compared with the prediction from the modified Debye Callaway

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Rapports d'organisations sur le sujet "Isotopic model"

A. Alsaed. ISOTOPIC MODEL FOR COMMERCIAL SNF BURNUP CREDIT. Office of Scientific and Technical Information (OSTI), 2005. http://dx.doi.org/10.2172/862028.

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A.H. Wells. ISOTOPIC MODEL FOR COMMERCIAL SNF BURNUP CREDIT. Office of Scientific and Technical Information (OSTI), 2004. http://dx.doi.org/10.2172/862151.

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L.B. Wimmer. Isotopic Generation and Confirmation of the PWR Application Model? Office of Scientific and Technical Information (OSTI), 2003. http://dx.doi.org/10.2172/899642.

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H.R. Radulesa. Isotopic Generation and Confirmation of the PWR Application Model? Office of Scientific and Technical Information (OSTI), 2005. http://dx.doi.org/10.2172/899643.

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Trowbridge, L. Isotopic selectivity of surface diffusion: An activated diffusion model. Office of Scientific and Technical Information (OSTI), 1989. http://dx.doi.org/10.2172/5462238.

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Berman, R. G., B. E. Taylor, W. J. Davis, M. Sanborn-Barrie, and J B Whalen. Crustal architecture and evolution of the central Thelon tectonic zone, Nunavut: insights from Sm-Nd and O isotope analysis, U-Pb zircon geochronology, and targeted bedrock mapping. Natural Resources Canada/CMSS/Information Management, 2024. http://dx.doi.org/10.4095/332497.

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New isotopic analyses (Sm-Nd, O, and U-Pb), targeted geological mapping, and previously published whole-rock geochemical data and high-resolution aeromagnetic surveys define ten crustal domains across the central Thelon tectonic zone. In the eastern Slave Craton, granitoid rocks in the Overby Lake domain are more isotopically evolved than in the Tinney Hills domain and include tonalite dated at 2.71 Ga. The 400 km long main leucogranite belt separates most early (ca. 2.07-1.95 Ga) Thelon tectonic zone plutonic belts from the Queen Maud Block. Oxygen isotopes support its formation via melting o

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Piercey, S. J., and J. L. Pilote. Nd-Hf isotope geochemistry and lithogeochemistry of the Rambler Rhyolite, Ming VMS deposit, Baie Verte Peninsula, Newfoundland: evidence for slab melting and implications for VMS localization. Natural Resources Canada/CMSS/Information Management, 2021. http://dx.doi.org/10.4095/328988.

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New high precision lithogeochemistry and Nd and Hf isotopic data were collected on felsic rocks of the Rambler Rhyolite formation from the Ming volcanogenic massive sulphide (VMS) deposit, Baie Verte Peninsula, Newfoundland. The Rambler Rhyolite formation consists of intermediate to felsic volcanic and volcaniclastic rocks with U-shaped primitive mantle normalized trace element patterns with negative Nb anomalies, light rare earth element-enrichment (high La/Sm), and distinctively positive Zr and Hf anomalies relative to surrounding middle rare earth elements (high Zr-Hf/Sm). The Rambler Rhyol

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Sitaraman, S., D. Biswas, R. Hafner, and B. Anderson. Allowable Isotopic Mass Limits for the Type 4 Contents in the Model 9977-96 SGQ-EC1 Unshielded Engineered Container. Office of Scientific and Technical Information (OSTI), 2010. http://dx.doi.org/10.2172/1119963.

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Hamilton, M. L., F. A. Garner, and B. M. Oliver. The influence of helium on mechanical properties of model austenitic alloys, determined using sup 59 Ni isotopic tailoring and fast reactor irradiation. Office of Scientific and Technical Information (OSTI), 1990. http://dx.doi.org/10.2172/6344602.

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Keeling, Ralph. Developing Model Constraints on Northern Extra-Tropical Carbon Cycling Based on measurements of the Abundance and Isotopic Composition of Atmospheric CO₂. Office of Scientific and Technical Information (OSTI), 2014. http://dx.doi.org/10.2172/1165340.

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