Bibliografías temáticas / Stoichiometric model

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Literatura académica sobre el tema "Stoichiometric model"

Autor: Grafiati

Publicado: 4 de junio de 2021

Última modificación: 26 de julio de 2025

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Artículos de revistas sobre el tema "Stoichiometric model"

Su, Yuqiao, Zhuoling Wu, Peiyun Xie, Lu Zhang, and Hui Chen. "Warming Effects on Topsoil Organic Carbon and C:N:P Stoichiometry in a Subtropical Forested Landscape." Forests 11, no. 1 (2020): 66. http://dx.doi.org/10.3390/f11010066.

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Warming effects on agricultural and forest ecosystems have been well documented at broad spatiotemporal scales but less so at stand and landscape scales. To detect the changes in soil organic carbon (SOC) and carbon:nitogen:phosphorus (C:N:P) stoichiometry in response to a short-range warming gradient, we defined an inverse elevation-dependent warming gradient and developed a novel index of warming based on a common environmental lapse rate. We associated the warming gradient and warming index with the changes in SOC and C:N:P stoichiometry and tested the independence of warming effects using

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Yu, Jianguo, Billy Valderrama, Hunter B. Henderson, Michele V. Manuel, and Todd Allen. "Near Surface Stoichiometry in UO2: A Density Functional Theory Study." Journal of Chemistry 2015 (2015): 1–8. http://dx.doi.org/10.1155/2015/142510.

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The mechanisms of oxygen stoichiometry variation in UO2at different temperature and oxygen partial pressure are important for understanding the dynamics of microstructure in these crystals. However, very limited experimental studies have been performed to understand the atomic structure of UO2near surface and defect effects of near surface on stoichiometry in which the system can exchange atoms with the external reservoir. In this study, the near (110) surface relaxation and stoichiometry in UO2have been studied with density functional theory (DFT) calculations. On the basis of the point-defec

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Bielefeld, Nikolaj M., Rasmus D. Sørensen, Mikkel Jørgensen, Kristoffer S. Kure, and Torsten Berning. "Operating Proton Exchange Membrane Fuel Cells at a Constant Relative Humidity." ECS Transactions 108, no. 7 (2022): 3–15. http://dx.doi.org/10.1149/10807.0003ecst.

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This study investigates the possibility of operating a proton exchange membrane fuel cell at a constant humidity of 100% from cathode inlet to cathode outlet. Employing the Engineering Equation Solver (EES), a model has been developed where the cathode channel flow is calculated via the discretized Hagen-Poiseuille equation. The stoichiometric flow ratio such that the decrease in the RH caused by the pressure drop is balanced by the addition of water due to the electrochemical reaction is calculated. Results show that in many cases the calculated stoichiometry is too low to be viable for a str

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Valant, Matjaz, and Danilo Suvorov. "A Stoichiometric Model for Sillenites." Chemistry of Materials 14, no. 8 (2002): 3471–76. http://dx.doi.org/10.1021/cm021173l.

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Cui, Lijuan, Zhiguo Dou, Zhijun Liu, et al. "Hyperspectral Inversion of Phragmites Communis Carbon, Nitrogen, and Phosphorus Stoichiometry Using Three Models." Remote Sensing 12, no. 12 (2020): 1998. http://dx.doi.org/10.3390/rs12121998.

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Studying the stoichiometric characteristics of plant C, N, and P is an effective way of understanding plant survival and adaptation strategies. In this study, 60 fixed plots and 120 random plots were set up in a reed-swamp wetland, and the canopy spectral data were collected in order to analyze the stoichiometric characteristics of C, N, and P across all four seasons. Three machine models (random forest, RF; support vector machine, SVM; and back propagation neural network, BPNN) were used to study the stoichiometric characteristics of these elements via hyperspectral inversion. The results sho

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Cimmelli, Vito Antonio. "Thermodynamics of Composition Graded Thermoelastic Solids." Entropy 25, no. 7 (2023): 1084. http://dx.doi.org/10.3390/e25071084.

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We propose a thermodynamic model describing the thermoelastic behavior of composition graded materials. The compatibility of the model with the second law of thermodynamics is explored by applying a generalized Coleman–Noll procedure. For the material at hand, the specific entropy and the stress tensor may depend on the gradient of the unknown fields, resulting in a very general theory. We calculate the speeds of coupled first- and second-sound pulses, propagating either trough nonequilibrium or equilibrium states. We characterize several different types of perturbations depending on the value

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Hauduc, H., L. Rieger, I. Takács, A. Héduit, P. A. Vanrolleghem, and S. Gillot. "A systematic approach for model verification: application on seven published activated sludge models." Water Science and Technology 61, no. 4 (2010): 825–39. http://dx.doi.org/10.2166/wst.2010.898.

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The quality of simulation results can be significantly affected by errors in the published model (typing, inconsistencies, gaps or conceptual errors) and/or in the underlying numerical model description. Seven of the most commonly used activated sludge models have been investigated to point out the typing errors, inconsistencies and gaps in the model publications: ASM1; ASM2d; ASM3; ASM3 + Bio-P; ASM2d + TUD; New General; UCTPHO+. A systematic approach to verify models by tracking typing errors and inconsistencies in model development and software implementation is proposed. Then, stoichiometr

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Wu, Huajian, Jianning Zhang, Yiren Wang, Jiacheng Shang, and Yong Jiang. "Stoichiometric and Nonstoichiometric Surface Structures of Pyrochlore Y2Zr2O7 and Their Relative Stabilities: A First-Principles Investigation." Coatings 13, no. 7 (2023): 1203. http://dx.doi.org/10.3390/coatings13071203.

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First-principle total energy calculations were performed to investigate the atomic structures and relative stabilities of two low miller-index surfaces of pyrochlore Y2Zr2O7. The stoichiometric Y2Zr2O7 (110) and (100) surfaces were predicted, with lowest formation energies of 1.20 and 1.47 J/m2, respectively. Based on a thermodynamic defect model, non-stoichiometric Y2Zr2O7 surface energies were further evaluated as a function of environmental oxygen partial pressure (pO2) and temperature (T). With all of the results, we were able to construct the surface phase diagrams for T = 300 and 1400 K.

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Li, Yitong, Yanghua Yu, and Yanping Song. "Stoichiometry of Soil, Microorganisms, and Extracellular Enzymes of Zanthoxylum planispinum var. dintanensis Plantations for Different Allocations." Agronomy 12, no. 7 (2022): 1709. http://dx.doi.org/10.3390/agronomy12071709.

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Plantations with different allocation patterns significantly affect soil elements, microorganisms, extracellular enzymes, and their stoichiometric characteristics. Rather than studying them as a continuum, this study used four common allocations of plantations: Zanthoxylum planispinum var. dintanensis (hereafter Z. planispinum) + Prunus salicina, Z. planispinum + Sophora tonkinensis, Z. planispinum + Arachis hypogaea, and Z. planispinum + Lonicera japonica plantations, as well as a single-stand Z. planispinum plantation as a control. Soil samples from depths of 0–10 and 10–20 cm at the five pl

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Gosain, K. L., D. K. Chaturvedi, Irina V. Belova, and Graeme E. Murch. "Tracer Diffusion by Six-Jump-Cycles in Nonstoichiometric B2 Intermetallic Compounds." Defect and Diffusion Forum 247-248 (December 2005): 9–20. http://dx.doi.org/10.4028/www.scientific.net/ddf.247-248.9.

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Tracer diffusion in non-stoichiometric B2 intermetallic compounds having antistructural disorder is investigated using the six-jump-cycle (6JC) as a fundamental diffusion unit. For non-stoichiometric compositions, the antistructural atoms are assumed to be isolated and located at one of the six [110]-type and [100]-type sites (as only these sites are involved in the 6JC or 2JC). The jump frequencies for the 6JC involving a perfectly ordered configuration are calculated in terms of a four-frequency-model, using the meanfirst- passage concept of Arita et al. The jump frequency of an antistructur

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Tesis sobre el tema "Stoichiometric model"

Thiele, Ines. "A stoichiometric model of Escherichia coli 's macromolecular synthesis machinery and its integration with metabolism." Diss., [La Jolla] : University of California, San Diego, 2009. http://wwwlib.umi.com/cr/ucsd/fullcit?p3355081.

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Thesis (Ph. D.)--University of California, San Diego, 2009.<br>Title from first page of PDF file (viewed June 16, 2009). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references (p. 209-232).

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Rajagopalan, Sai S. V. "Model Based Control Design And Rapid Calibration For Air To Fuel Ratio Control Of Stoichiometric Engines." The Ohio State University, 2008. http://rave.ohiolink.edu/etdc/view?acc_num=osu1221851638.

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Harding, TH. "A steady state stoichiometric model describing the anaerobic digestion of biological excess phosphorus removal waste activate sludge." Master's thesis, University of Cape Town, 2009. http://hdl.handle.net/11427/5042.

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A. Background, Principle Objectives and Scope Until the mid-1990's model-based studies on wastewater treatment plants (WWTPs) focussed on the development of models describing a single unit operation within the WWTP i.e. an activated sludge system, an anaerobic digester or some other WWTP unit operation. The focus of these model-based studies changed in the late 1990's due to limitations in linking different models in applications for multi unit operation or full scale plant-wide designs or process evaluations. The boundaries related to the focus of these model-based studies within the WWTP, wa

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Alemu, Aklilu W. "Modelling greenhouse gas emissions in cattle: From rumen to the whole-farm." Elsevier B.V. (Animal Feed Science and Technology), 2011. http://hdl.handle.net/1993/14668.

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Mathematical modeling in animal agriculture can be applied at various levels including at the tissue, organ, animal, farm, regional and global levels. The purposes of this research were i) to evaluate models used to estimate volatile fatty acid (VFA) and methane (CH4) production and assess their impact on regional enteric CH4 inventory, and ii) to develop a process-based, whole-farm model to estimate net farm GHG emissions. In the first study, four VFA stoichiometric models were evaluated for their prediction accuracy of rumen VFA and enteric CH4 production. Comparison of measured and model pr

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Sasidharan, L. Swathy. "Modélisation de la croissance des plantes supérieures pour les systèmes de support-vie : modèle métabolique de la feuille de laitue considérant la conversion d'énergie et le métabolisme central du carbone." Phd thesis, Université Blaise Pascal - Clermont-Ferrand II, 2012. http://tel.archives-ouvertes.fr/tel-00797968.

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Pour des missions spatiales de longue durée, les plantes supérieures doivent faire partie des systèmes de support-vie. Le projet Micro-Ecological Life Support System Alternative (MELiSSA, alternative de système de support-vie micro-écologique) de l'Agence Spatiale Européenne est basé sur un système clos de support vie qui inclut, autour d'un compartiment consommateur, des compartiments microbiens et des plantes supérieures. Les plantes consomment les déchets pouvant être recyclés (les eaux usées et du CO2) et produisent de la nourriture fraîche, de l'eau potable et de l'oxygène pour l'équipage

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Knecht, Billberger Magnus F. "Plant growth - stoichiometry and competition : theory development in ecosystem ecology /." Uppsala : Dept. of Ecology and Environmental Research, Swedish University of Agricultural Sciences, 2006. http://epsilon.slu.se/200624.pdf.

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Rodriguez, Jose Ramon. "Experimental and analytical study to model temperature profiles and stoichiometry in oxygen-enriched in-situ combustion." Texas A&M University, 2003. http://hdl.handle.net/1969.1/134.

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A new combustion zone analytical model has been developed in which the combustion front temperature may be calculated. The model describes in the combustion zone, the amount of fuel burned based on reaction kinetics, the fuel concentration and produced gas composition based on combustion stoichiometry, and the amount of heat generated based on a heat balance. Six runs were performed in a 3-inch diameter, 40-inch long steel combustion tube with Jobo crude oil (9-11°API) from the Orinoco Belt in Venezuela. These runs were carried out with air containing three values of oxygen concentration, 21%,

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He, Liming. "Adsorption of sulfate and phosphate at the mineral-water interface: isotherm, stoichiometry, and models." Diss., Virginia Tech, 1995. http://hdl.handle.net/10919/40310.

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Processes occurring at mineral-water interfaces play critical roles for regulating the composition of surface and groundwater, for soil development, and for the availability of plant nutrients. Sulfate adsorption at three pH levels was conducted on y-AI203 and kaolinite. The adsorption isotherms were described well by the simple Langmuir, two-site Langmuir, Freundlich, and Temkin equations. The capacity of SO42-adsorption for y-AI203 was five times greater than for kaolinite, indicating the difference in reactive site density between y-Ab03 and kaolinite. Mathematical analyses for the adsorpti

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Marki, Alexandra [Verfasser]. "Model based analysis of plankton responses to variations in nutrient stoichiometry in oxygen minimum zones / Alexandra Marki." Kiel : Universitätsbibliothek Kiel, 2016. http://d-nb.info/1082237094/34.

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Göthlich, Lena [Verfasser]. "Impacts of variable versus fixed phytoplankton stoichiometry on the dynamics of biogeochemical models / Lena Göthlich." Kiel : Universitätsbibliothek Kiel, 2012. http://d-nb.info/1029083843/34.

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Libros sobre el tema "Stoichiometric model"

Wayman, F. M. Preparation and evaluation of a stoichiometric computer model of Brevibacterium flavum. UMIST, 1998.

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Givnish, Thomas J., K. William Sparks, Steven J. Hunter, and Andrej Pavlovič. Why are plants carnivorous? Cost/benefit analysis, whole-plant growth, and the context-specific advantages of botanical carnivory. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198779841.003.0018.

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The 1984 cost/benefit model for the evolution of carnivorous plants addresses their potential energetic and ecological advantages. It has provided a conceptual framework for research on distribution, variation in trap allocation and mechanisms, association with low rates of photosynthesis and whole-plant growth, and ecology of carnivorous plants relative to noncarnivorous ones. We re-assess this model, its potential extensions, and the validity of its assumptions and predictions. We review what is known about photosynthesis, respiration, relative growth rates, and resource allocation in carniv

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Capítulos de libros sobre el tema "Stoichiometric model"

Fromm, E. "Model Calculations of Metal Oxidation at Ambient Temperatures." In Non-Stoichiometric Compounds. Springer Netherlands, 1989. http://dx.doi.org/10.1007/978-94-009-0943-4_36.

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Pradhan, P., S. M. Mahajani, and A. Arora. "Evaluating the Sensitivity of Biomass Feedstocks to Producer Gas Composition Using Stoichiometric Equilibrium Model." In Advances in Energy Research, Vol. 2. Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-2662-6_64.

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Bhatt, Kangana, Sanjay Patel, Darshit Upadhyay, and Rajesh Patel. "Conversion of Solid Waste to Combustible Gases Using Non-stoichiometric Model for Plasma Pyrolysis Process." In Lecture Notes in Civil Engineering. Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-99-6616-5_5.

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Xie, Liangzhi, and Daniel I. C. Wang. "Applications of improved stoichiometric model in medium design and fed-batch cultivation of animal cells in bioreactor." In Cell Culture Engineering IV. Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-011-0257-5_4.

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Lemosquet, S., O. Abdou Arbi, A. Siegel, J. Guinard-Flament, J. Van Milgen, and J. Bourdon. "A generic stoichiometric model to analyse the metabolic flexibility of the mammary gland in lactating dairy cows." In Modelling nutrient digestion and utilisation in farm animals. Wageningen Academic Publishers, 2011. http://dx.doi.org/10.3920/978-90-8686-712-7_31.

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Bohn, Jan-Peter, Adrian Goanta, Andreas Baumgartner, Maximilian Blume, and Hartmut Spliethoff. "Validation of CFD-Models for Non-stoichiometric Oxycoal Combustion." In Cleaner Combustion and Sustainable World. Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-30445-3_155.

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Fabrichnaya, Olga B., Surendra K. Saxena, Pascal Richet, and Edgar F. Westrum. "Thermodynamic Data for Stoichiometric Phases and End Members of Solid Solutions." In Thermodynamic Data, Models, and Phase Diagrams in Multicomponent Oxide Systems. Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-662-10504-7_3.

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Čupić, Željko, and Ljiljana Kolar-Anić. "Contraction of the Complex Models by the Stoichiometric Network Analysis." In Advanced Science and Technology of Sintering. Springer US, 1999. http://dx.doi.org/10.1007/978-1-4419-8666-5_8.

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Cheng, Maurice Man Wai, and John K. Gilbert. "Teaching Stoichiometry with Particulate Diagrams – Linking Macro Phenomena and Chemical Equations." In Models and Modeling in Science Education. Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-06526-7_6.

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Bordbar, Aarash, and Bernhard Ø. Palsson. "Moving Toward Genome-Scale Kinetic Models: The Mass Action Stoichiometric Simulation Approach." In Functional Coherence of Molecular Networks in Bioinformatics. Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4614-0320-3_8.

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Actas de conferencias sobre el tema "Stoichiometric model"

O’Donnell, Sean T., Nasser Hamdan, Bruce E. Rittmann, and Edward Kavazanjian. "A Stoichiometric Model for Biogeotechnical Soil Improvement." In Geo-Chicago 2016. American Society of Civil Engineers, 2016. http://dx.doi.org/10.1061/9780784480120.002.

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Kremling, Andreas, Katrin Zeilinger, Jorg C. Gerlach, and Ernst Dieter Gilles. "A reduced stoichiometric model to describe metabolism in hepatocytes." In 2006 IEEE Conference on Computer Aided Control System Design, 2006 IEEE International Conference on Control Applications, 2006 IEEE International Symposium on Intelligent Control. IEEE, 2006. http://dx.doi.org/10.1109/cacsd-cca-isic.2006.4776901.

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Kremling, Andreas, Katrin Zeilinger, Jorg Gerlach, and Ernst Gilles. "A reduced stoichiometric model to describe metabolism in hepatocytes." In 2006 IEEE International Conference on Control Applications. IEEE, 2006. http://dx.doi.org/10.1109/cca.2006.286133.

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Zanoli, Silvia Maria, Luca Barboni, Francesco Cocchioni, and Crescenzo Pepe. "Stoichiometric ratios constraints handling through model predictive control strategy." In 2017 IEEE International Conference on Power, Control, Signals and Instrumentation Engineering (ICPCSI). IEEE, 2017. http://dx.doi.org/10.1109/icpcsi.2017.8391992.

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Karamitros, Dimitrios, Adjer Ibraimova, Konstantinos Konstantinidis, Grigorios Koltsakis, Sungmu Choi, and Jiho Cho. "Methane Conversion in Stoichiometric Natural Gas Engine Exhaust." In WCX SAE World Congress Experience. SAE International, 2024. http://dx.doi.org/10.4271/2024-01-2632.

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<div class="section abstract"><div class="htmlview paragraph">Stoichiometric natural gas (CNG) engines are an attractive solution for heavy-duty vehicles considering their inherent advantage in emitting lower CO<sub>2</sub> emissions compared to their Diesel counterparts. Additionally, their aftertreatment system can be simpler and less costly as NOx reduction is handled simultaneously with CO/HC oxidation by a Three-Way Catalyst (TWC). The conversion of methane over a TWC shows a complex behavior, significantly different than non-methane hydrocarbons in stoichiometric

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Lapp, Justin, and Wojciech Lipiński. "Transient Three-Dimensional Heat Transfer Model of a Solar Thermochemical Reactor for H2O and CO2 Splitting via Nonstoichiometric Ceria Redox Cycling." In ASME 2013 7th International Conference on Energy Sustainability collocated with the ASME 2013 Heat Transfer Summer Conference and the ASME 2013 11th International Conference on Fuel Cell Science, Engineering and Technology. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/es2013-18040.

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A transient heat transfer model is developed for a solar reactor prototype for H2O and CO2 splitting via two-step non-stoichiometric ceria cycling. Counter-rotating cylinders of reactive and inert materials cycling between high and low temperature zones permit continuous operation and heat recovery. To guide the reactor design a transient three-dimensional heat transfer model is developed based on transient energy conservation, accounting for conduction, convection, radiation, and chemical reactions. The model domain includes the rotating cylinders, a solar receiver cavity, and insulated react

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Rizk, Nader K., Ju S. Chin, Andre W. Marshall, and Mohan K. Razdan. "Predictions of NOx Formation Under Combined Droplet and Partially Premixed Reaction of Diffusion Flame Combustors." In ASME 1999 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/99-gt-357.

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A methodology is presented in this paper on the modeling of NOx formation in diffusion flame combustors where both droplet burning and partially premixed reaction proceed simultaneously. The model simulates various combustion zones with an arrangement of reactors that are coupled with a detailed chemical reaction scheme. In this model, the primary zone of the combustor comprises a reactor representing contribution from droplet burning under stoichiometric conditions and a mixing reactor that provides additional air or fuel to the primary zone. The additional flow allows forming a fuel vapor/ai

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Babaie Rizvandi, Omid, and Serhat Yesilyurt. "Modeling of Flow Distribution in Proton Exchange Membrane Fuel Cell." In ASME 2018 16th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/icnmm2018-7658.

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Analysis and design of flow fields for proton exchange membrane fuel cell (PEMFC) require coupled solution of the flow fields, gas transport and electrochemical reaction kinetics in the anode and the cathode. Computational cost prohibits the widespread use of three-dimensional models of the anode and cathode flow fields, gas diffusion layers (GDL), catalyst layers (CL) and the membrane for fluid flow and mass transport. On the other-hand, detailed cross-sectional two-dimensional models cannot resolve the effects of the anode and cathode flow field designs. Here, a two-dimensional in-plane mode

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Maurente, Andre´, Hora´cio A. Vielmo, and Francis H. R. Franc¸a. "Comparison of the Monte Carlo Method Applied to the Absorption-Line Blackbody Distribution With a Conventional WSGG Model." In ASME 2006 International Mechanical Engineering Congress and Exposition. ASMEDC, 2006. http://dx.doi.org/10.1115/imece2006-14394.

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This paper presents results of radiation heat transfer obtained from two gas models: the Absorption-Line Blackbody (ALB) distribution function and a conventional weighted-sum-of-gray-gases (WSGG) model. A typical cylindrical combustion chamber is considered. For the first model, the radiative exchanges are computed with the Monte Carlo, since the ALB distribution function can be directly related to the Monte Carlo cumulative distribution function. For the WSGG model, the radiation heat transfer is solved with the zonal method. Two gaseous mixtures are considered, and represent typical products

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Coombs, Deshawn M., Nathan D. Peters, and Ben Akih-Kumgeh. "Experimental and Numerical Investigation of Early Phase of Laser Ignition Under Stoichiometric and Lean Conditions." In ASME Turbo Expo 2018: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/gt2018-77238.

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Forced ignition, the initiation of combustion processes by rapid and localized introduction of energy, is central to the successful operation of many combustion systems. It is therefore of interest to investigate this process, starting from the introduction of energy to the emergence of self-sustained flame or the quenching of an otherwise initialized flame kernel. Since the process is highly non-equilibrium and involves various complex kinetic phenomena, it is important to understand the key aspects that control failed or successful ignition. Detailed studies of the early phases of the igniti

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Informes sobre el tema "Stoichiometric model"

Hohn and Zeng. PR-266-14200-R01 Modeling of NSCR Performance with Natural Gas Exhaust. Pipeline Research Council International, Inc. (PRCI), 2016. http://dx.doi.org/10.55274/r0010880.

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There is a need for highly efficient processes for treating the engine exhaust from natural gas-powered engine in order to meet current and potential environmental regulations. One means to do so is to employ dithering, where the air to fuel ratio sent to the engine is cycled between high and low values around the stoichiometric point. There is limited experimental data to suggest that dithering can be effective, but little is known about how dithering impacts the performance of a three-way catalyst to destroy pollutants from natural gas-powered engines. This research simulates the performance

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Rempel, K. U., A. E. Williams-Jones, and K. Fuller. An experimental investigation of the solubility and speciation of uranium in hydrothermal ore fluids. Natural Resources Canada/CMSS/Information Management, 2021. http://dx.doi.org/10.4095/328995.

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Experimental data on the solubility and speciation of uranium in hydrothermal solution is required to improve genetic models for the formation of ore deposits, yet very few data of this type have been published. Of particular interest is the oxidation state of the uranium in solution, as conventional wisdom suggests that U is dissolved in the oxidized U(VI) state and precipitated as reduced U(IV) minerals, yet recent experiments have shown ppm-level solubility for U(IV). This study investigated the mobility of reduced U(IV) and oxidized U(VI) in acidic (pH = 2), fluoride- bearing and alkaline

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