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Artykuły w czasopismach na temat "Diffusion-controlled kinetics"

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Maxwell, Ian A., and Gregory T. Russell. "Diffusion controlled copolymerization kinetics." Die Makromolekulare Chemie, Theory and Simulations 2, no. 1 (1993): 95–128. http://dx.doi.org/10.1002/mats.1993.040020108.

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Berezhkovskii, A. M., Yu A. Makhnovskii, and R. A. Suris. "Kinetics of diffusion-controlled reactions." Chemical Physics 137, no. 1-3 (1989): 41–49. http://dx.doi.org/10.1016/0301-0104(89)87091-0.

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Dušek, Karel, and Ivan Havlíček. "Diffusion controlled kinetics of crosslinking." Progress in Organic Coatings 22, no. 1-4 (1993): 145–59. http://dx.doi.org/10.1016/0033-0655(93)80020-b.

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Keddam, Mourad, Polat Topuz, and Özlem Aydin. "Simulation of boronizing kinetics of AISI 316 steel with an integral diffusion model." Materials Testing 63, no. 10 (2021): 906–12. http://dx.doi.org/10.1515/mt-2021-0023.

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Abstract Boriding or boronizing is a type of surface property improvement process applied to metal or some non-metal materials by diffusion. The calculation of diffusion kinetics is also very important as it is a diffusion controlled process. Today, many researchers perform kinetic calculations by applying the Second Fick’s law to the Arrhenius equation. In this study, as an alternative to conventional kinetic calculations, the mathematical modeling of diffusion kinetics has been performed using the integral diffusion model. For the boronizing experiments, the pack-boronizing method was chosen
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Sharma, D. K., and D. S. Soane. "High-conversion diffusion-controlled copolymerization kinetics." Macromolecules 21, no. 3 (1988): 700–710. http://dx.doi.org/10.1021/ma00181a027.

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Wang, Jun, Chen Wei, Haoxue Yang, Tong Guo, Tingting Xu, and Jinshan Li. "Phase Transformation Kinetics of a FCC Al0.25CoCrFeNi High-Entropy Alloy during Isochronal Heating." Metals 8, no. 12 (2018): 1015. http://dx.doi.org/10.3390/met8121015.

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The phase transformation kinetics of a face-centered-cubic (FCC) Al0.25CoCrFeNi high-entropy alloy during isochronal heating is investigated by thermal dilation experiment. The phase transformed volume fraction is determined from the thermal expansion curve, and results show that the phase transition is controlled by diffusion controlled nucleation-growth mechanism. The kinetic parameters, activation energy and kinetic exponent are determined based on Kissinger–Akahira–Sunose (KAS) and Johnson–Mehl–Avrami (JMA) method, respectively. The activation energy and kinetic exponent determined are alm
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Deng, Yong, and George C. Martin. "Diffusion and Diffusion-Controlled Kinetics during Epoxy-Amine Cure." Macromolecules 27, no. 18 (1994): 5147–53. http://dx.doi.org/10.1021/ma00096a043.

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Filippova, Nadezhda L. "Kinetic-Diffusion-Controlled Adsorption and Desorption Kinetics on Planar Surfaces." Journal of Colloid and Interface Science 206, no. 2 (1998): 592–602. http://dx.doi.org/10.1006/jcis.1998.5771.

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Kozubski, Rafal, Graeme E. Murch, and Irina V. Belova. "Vacancy-Mediated Diffusion and Diffusion-Controlled Processes in Ordered Binary Intermetallics by Kinetic Monte Carlo Simulations." Diffusion Foundations 29 (April 2021): 95–115. http://dx.doi.org/10.4028/www.scientific.net/df.29.95.

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We review the results of our Monte Carlo simulation studies carried out within the past two decades in the area of atomic-migration-controlled phenomena in intermetallic compounds. The review aims at showing the high potential of Monte Carlo methods in modelling both the equilibrium states of the systems and the kinetics of the running processes. We focus on three particular problems: (i) the atomistic origin of the complexity of the ‘order-order’ relaxations in γ’-Ni3Al; (ii) surface-induced ordering phenomena in γ-FePt and (iii) ‘order—order’ kinetics and self-diffusion in the ‘triple-defect
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Sequeira, César A. C. "Wagnerian Scaling Diffusion Kinetics." Defect and Diffusion Forum 273-276 (February 2008): 594–601. http://dx.doi.org/10.4028/www.scientific.net/ddf.273-276.594.

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The reaction of a metal or alloy with an oxidising environment to form a scale often involves a diffusion process as the rate limiting step. The most protective oxide scales are slow growing, adherent to the substrate, and free of cracks or pores. The growth of these scales is typically by solid state diffusion of metal or oxygen ions that move via point defects in the oxide lattice. In 1933, C. Wagner established a scientific basis for oxidation processes controlled by solid state diffusion, with his celebrated derivation of the parabolic rate constant, which connects scaling rates, diffusion
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Rozprawy doktorskie na temat "Diffusion-controlled kinetics"

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Ruthven, Douglas M. "Adsorption and desorption kinetics for diffusion controlled systems with a strongly concentration dependent diffusivity." Universitätsbibliothek Leipzig, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-193874.

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The formal solution to the diffusion equation for transient adsorption in a semiinfinite medium with a strongly concentration dependent diffusivity, originally derived by Fujita ( 3 ), has been extended to desorption. Profiles for adsorption and desorption are compared and simplified asymptotic expressions which are useful when the diffusivity ratio is large are derived. The effect of a strongly concentration dependent diffusivity on adsorption and desorption kinetics is briefly considered.
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Kuzovkov, Vladimir N., Eugene A. Kotomin, Anatoli I. Popov, and Rafael Vila. "Diffusion-controlled kinetics of metallic colloid formation in irradiated Al2O3, MgO and NaCl crystals." Universitätsbibliothek Leipzig, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-198353.

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Kuzovkov, Vladimir N., Eugene A. Kotomin, Anatoli I. Popov, and Rafael Vila. "Diffusion-controlled kinetics of metallic colloid formation in irradiated Al2O3, MgO and NaCl crystals." Diffusion fundamentals 24 (2015) 30, S. 1, 2015. https://ul.qucosa.de/id/qucosa%3A14546.

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Ruthven, Douglas M. "Adsorption and desorption kinetics for diffusion controlled systems with a strongly concentration dependent diffusivity: Adsorption and desorption kinetics for diffusion controlledsystems with a strongly concentration dependent diffusivity." Diffusion fundamentals 6 (2007) 51, S. 1-11, 2007. https://ul.qucosa.de/id/qucosa%3A14230.

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The formal solution to the diffusion equation for transient adsorption in a semiinfinite medium with a strongly concentration dependent diffusivity, originally derived by Fujita ( 3 ), has been extended to desorption. Profiles for adsorption and desorption are compared and simplified asymptotic expressions which are useful when the diffusivity ratio is large are derived. The effect of a strongly concentration dependent diffusivity on adsorption and desorption kinetics is briefly considered.
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Lian, Qiyu. "Adsorption of Lead(II) onto Phosphate Modified Ordered Mesoporous Carbon| Kinetics, Isotherm, Mechanism, Thermodynamic and Diffusion-Controlled Study." Thesis, University of Louisiana at Lafayette, 2019. http://pqdtopen.proquest.com/#viewpdf?dispub=10814555.

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<p>Adsorption of Pb2+ onto ordered mesoporous Carbon (OMC) modified by nitric and phosphoric acid was investigated with variations of the parameters, such as pH, contact time, temperature, and initial concentration. Optimum Pb2+ adsorption was observed at a pH value of 5. Modified OMC was characterized by Nitrogen Adsorption-Desorption Isotherm, FT-IR, SEM, EDS, and TEM. The time required to reach equilibrium was between 20 mins and 30 mins. The equilibrium adsorption capacity of modified OMC (MOMC-NP) increased with the increase of temperature indicating that the process of Pb2+ adsorption i
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Reigada, Sanz Ramon. "Effects of some mixing flows on diffusion-controlled reactions = Efectes d'alguns fluxes de mescla en reaccions controlades per difusió." Doctoral thesis, Universitat de Barcelona, 1997. http://hdl.handle.net/10803/666101.

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Los sistemas de reacción-difusión donde el proceso difusivo es la etapa lenta están controlados, a bajas dimensionalidades, por las fluctuaciones en las distribuciones iniciales de reactivos. Concretamente, estos sistemas se segregan en dominios de las diferentes especies obteniéndose comportamientos cinéticos anómalos. Estudiamos estos comportamientos no formales en el sistema reactivo binario A+B=O mediante la explotación analítica y numérica de las ecuaciones deterministas de reacción-difusión para las concentraciones locales de ambos reactivos suponiendo válida la aproximación de campo
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Симак, Д. М. "Науково-теоретичні основи масообміну у системах з твердою фазою". Thesis, Сумський державний університет, 2019. http://essuir.sumdu.edu.ua/handle/123456789/72595.

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Дисертація присвячена теоретичним та експериментальним дослідженням масообмінних процесів з твердою фазою у дво- та трифазних системах. Вирішена науково-технічна проблема дає змогу моделювати процеси сушіння, розчинення та екстрагування, використовувати нові методи їх інтенсифікації та розрахунку обладнання для їх проведення. Досліджено гідродинаміку, тепло- і масообмін та динаміку фільтраційного сушіння дисперсних матеріалів та визначено кінетичні коефіцієнти процесу. Досліджено розчинення полідисперсних сумішей у апараті періодичної дії за умови зміни рушійної сили та неперервне розчинення з
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Barkle, Gregory Francis. "The fate of carbon and nitrogen from an organic effluent irrigated onto soil : process studies, model development and testing." Lincoln University, 2001. http://hdl.handle.net/10182/1959.

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The fate of the carbon and nitrogen in dairy farm effluent (DFE) applied onto soil was investigated through laboratory experiments and field lysimeter studies. They resulted in the development and testing of a complex carbon (C) and nitrogen (N) simulation model (CaNS-Eff) of the soil-plant-microbial system. To minimise the risk of contamination of surface waters, regulatory authorities in New Zealand promote irrigation onto land as the preferred treatment method for DFE. The allowable annual loading rates for DFE, as defined in statutory regional plans are based on annual N balance calculati
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Kuzovkov, V. N., A. I. Popov, and E. A. Kotomin. "Anomalous diffusion-controlled kinetics in irradiated oxide crystals." 2019. https://ul.qucosa.de/id/qucosa%3A38643.

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MgO, Al2O3 and MgF2 are three wide gap insulating materials with different crystalline structures. All three materials are radiation resistant and have many important applications, e.g. in reactor optical windows. It is very important to predict their long-time defect structure evolution controlled by defect migration and reactions. One could estimate the diffusion coefficients of radiation defects in solids from measurements of the main defect concentration changes (oxygen vacancies called the F-type color centers, by optical absorption) under different conditions, e.g., sample heating (annea
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Książki na temat "Diffusion-controlled kinetics"

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F, Timashev S., and Belyĭ A. A, eds. Kinetics of diffusion controlled chemical processes. Nova Science Publishers, 1989.

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Nguyen, Hung Lee. Evaluation of a hybrid kinetics/mixing-controlled combustion model for turbulent premixed and diffusion combustion using KIVA-II. National Aeronautics and Space Administration, 1990.

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Kotomin, E., and V. Kuzovkov. Modern Aspects of Diffusion-Controlled Reactions: Cooperative Phenomena in Bimolecular Processes. Elsevier Science & Technology Books, 1996.

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Zhou, Yunhong. Numerical modelling of process kinetics during TLP-bonding and other diffusion-controlled processes. 1994.

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Części książek na temat "Diffusion-controlled kinetics"

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Joos, Paul, Valentin B. Fainerman, Giuseppe Loglio, Emmi H. Lucassen-Reynders, Reinhard Miller, and Peter Petrov. "Diffusion Controlled Adsorption Kinetics." In Dynamic Surface Phenomena. CRC Press, 2023. http://dx.doi.org/10.1201/9780429070921-5.

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Lõpez-Quintela, M. Arturo, and Wilhelm Knoche. "Fractals in Diffusion-Controlled Kinetics." In Reactions in Compartmentalized Liquids. Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/978-3-642-74787-8_21.

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Leyvraz, F. "Reaction Kinetics for Diffusion Controlled Aggregation." In Fractals, Quasicrystals, Chaos, Knots and Algebraic Quantum Mechanics. Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-009-3005-6_4.

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Tanaka, Keiji, and Hyuk Yu. "Polymer-Modulated, Diffusion-Controlled Enzyme Kinetics on Monolayers." In ACS Symposium Series. American Chemical Society, 2002. http://dx.doi.org/10.1021/bk-2003-0840.ch004.

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Yoo, Han-Ill. "Kinetics of Gas/Solid Reaction: Diffusion-Controlled Case." In Lectures on Kinetic Processes in Materials. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-25950-1_8.

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Joos, Paul, Valentin B. Fainerman, Giuseppe Loglio, Emmi H. Lucassen-Reynders, Reinhard Miller, and Peter Petrov. "Diffusion Controlled Adsorption Kinetics to a Continuously Deformed Surface." In Dynamic Surface Phenomena. CRC Press, 2023. http://dx.doi.org/10.1201/9780429070921-6.

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Joesten, Raymond L. "Chapter 11. KINETICS OF COARSENING AND DIFFUSION-CONTROLLED MINERAL GROWTH." In Contact Metamorphism, edited by Derrill M. Kerrick. De Gruyter, 1991. http://dx.doi.org/10.1515/9781501509612-014.

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Frade, J. R. "Applicability of Quasi Steady State Solutions for the Kinetics of Diffusion Controlled Solid State Reactions." In NATO Science Series E: (closed). Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-011-1182-9_4.

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Vyshnevska, Yu P., and I. V. Brazhnyk. "Kinetic Regularities of the Interphase Diffusion-Controlled Processes Within Thin Film Formation." In Springer Proceedings in Physics. Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-18096-5_34.

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Martin, Georges, and Frédéric Soisson. "Kinetic Monte Carlo Method to Model Diffusion Controlled Phase Transformations in the Solid State." In Handbook of Materials Modeling. Springer Netherlands, 2005. http://dx.doi.org/10.1007/1-4020-3286-2_115.

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Streszczenia konferencji na temat "Diffusion-controlled kinetics"

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Hasson, David, and Andrei Cornel. "Kinetics of CaCO3 Precipitation in the Presence of SHMP." In CORROSION 2007. NACE International, 2007. https://doi.org/10.5006/c2007-07051.

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Abstract The present work examines the kinetics of CaCO3 precipitation in a continuous stirred tank vessel in the presence of the inhibiting additive sodium hexametaphosphate (SHMP). The degree of CaCO3 precipitation and the degree of SHMP adsorption on the crystallizing particles were both measured in a series of experiments performed at the same initial supersaturation level. The parameters varied were the initial SHMP concentration and the residence time in the precipitation vessel. Variation of the SHMP dosage level gave the anticipated trend of a decrease in the degree of CaCO3 precipitat
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Woollam, Richard C., and Richard Barker. "An Explanation for the Difference in Reported Iron Carbonate (Siderite) Precipitation Kinetics." In CONFERENCE 2025. AMPP, 2025. https://doi.org/10.5006/c2025-00434.

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Abstract In energy production, and carbon capture and storage processes which involve the transport of carbon dioxide (CO2)-saturated aqueous solution in carbon steel pipework, the precipitation of iron carbonate (siderite) at the steel-solution interface is known to have a significant impact on the corrosion process. As a result, the precipitation kinetics of iron carbonate have been an area of significant research with several studies reported in literature. Unfortunately, the reported rates of precipitation can differ by 2 - 3 orders of magnitude depending on the experimental methodology. I
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Alsaiari, H. A., A. T. Kan, and M. B. Tomson. "Constant Composition Study of Crystal Growth of Mixed Calcium-Ferrous Carbonate Salt." In CORROSION 2010. NACE International, 2010. https://doi.org/10.5006/c2010-10130.

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Abstract The formation of iron carbonate films, or by converting carbonate to magnetite at higher temperatures, are important means used to control the rate of corrosion in the oil and gas industry. The FeCO3 film can slow the corrosion process by covering up the steel surface and preventing the diffusion of corrosive species to the pipe surface. On the other hand, the excessive build up of iron carbonate salt in the oilfield production line can be a major issue, particularly, in the absence of effective inhibitors. The growth and thickness of the film depend upon the kinetics of precipitation
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Koutsoukos, Petros G., and Evangelia Kapetanaki. "Mixed Calcium Carbonate and Calcium Sulfate Scale." In CORROSION 2016. NACE International, 2016. https://doi.org/10.5006/c2016-07457.

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Abstract Crystallization fouling is one of the major problems in process industries using water. In the present work the precipitation of calcium carbonate (CaCO3), and of mixed calcium carbonate - calcium sulfate (CaSO4) deposits on the walls of a heated metal surface of stainless steel was investigated. All experiments were done at constant flow (2.3 ± 0.1 l/min), pressure and wall temperature (51± 1°C) using solutions either supersaturated with respect to calcium carbonate or both with respect to calcium carbonate and calcium sulfate. The kinetics of mineral deposition was monitored by the
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Castaneda, H., G. Zambrano, C. Angeles, and J. Genesca. "Film Stability for API 5L X-52 Line Pipe Steel in CO2 (aq) and Cl- (aq) Solutions in Presence of Amine Based Inhibitor under Hydrodynamic Conditions." In CORROSION 2004. NACE International, 2004. https://doi.org/10.5006/c2004-04361.

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Abstract Film stability for the system Fe-Cl--CO2-H2O is characterized by electrochemical methods and surface analysis techniques. Additions of CO2 (g) to API 5L X-52 steel exposed in brine solutions promoted the formation of FeCO3 on active sites left by dissolution of FexOy films under hydrodynamic conditions. When rotating rate is introduced to the steel-electrolyte interface, a competition for the active sites is showed during electrochemical experiments because of the diffusion phenomenon of the ionic species to the surface of the metal interface. These interface interaction creates activ
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Becerra Araneda, Abraham A., Martín A. Rodríguez, Mariano A. Kappes, and Ricardo M. Carranza. "Pitting Corrosion of a Ni-Cr-Fe Alloy in Chloride and Thiosulfate Solutions: One-dimensional Artificial Pit Electrode Studies." In CORROSION 2021. AMPP, 2021. https://doi.org/10.5006/c2021-16523.

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Abstract Ni-Cr-Fe alloys such as UNS N08800 (alloy 800) suffer pitting corrosion in chloride (Cl−) plus thiosulfate (S2O32−) solutions. This occurs due to a synergistic effect between both ions in a certain range of solution concentration and electrochemical potential. Potentiodynamic tests in 1 M NaCl + 10−3 M S2O32− solutions evidenced thiosulfate pitting by a peak in anodic current centered near -0.15 VSCE. The maximum anodic current of this peak increased with a decrease in potential scanning rate, reflecting the autocatalytic nature of the pitting process and the increased available time
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Videm, Ketil. "The Influence of Composition of Carbon Steels on Anodic- and Cathodic Reaction Rate in CO2 Corrosion." In CORROSION 1998. NACE International, 1998. https://doi.org/10.5006/c1998-98030.

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Abstract Experiments were carried out with pure iron and carbon steels in CO2 containing brine in the temperature range 25-70°C. The anodic dissolution of iron takes place by two different mechanisms Low pH and low corrosion rates favored dissolution in the "active" state. This process is charge transfer controlled and has a Tafel slope of 30-50 mV/decade. The reaction rate at a given potential increased about proportionally with the hydroxyl concentration. A change in the dissolution mechanism took place at a pH about 4 to so called "prepassive" dissolution. This process is little influenced
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Chatzipetros, N., P. D. Natsi, and P. G. Koutsoukos. "The Formation of Struvite Scale Formation and the Effect of As(V) and Hg(II) Impurities." In CORROSION 2019. NACE International, 2019. https://doi.org/10.5006/c2019-12942.

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Abstract Magnesium ammonium phosphate hexahydrate (MgNH4PO4·6H2O, Struvite) scale deposits may become a serious operational problem in anaerobic treatment of municipal and industrial wastewater. The kinetics of nucleation and crystal growth at constant supersaturation was investigated in a 1L reactor at pH 9.50, 25°C both in the absence and in the presence of As(V) and Hg(II) ions. The concentration levels tested precluded the formation of the respective insoluble salts. Over the range of the relative supersaturation with respect to struvite investigated (σ=0.096-0.37) the presence of As(V) re
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Pots, B. F. M. "Mechanistic Models for the Prediction of CO2 Corrosion Rates under Multi-phase Flow Conditions." In CORROSION 1995. NACE International, 1995. https://doi.org/10.5006/c1995-95137.

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Abstract A methodology for CO2 corrosion rate prediction is presented which is based on mechanistic modelling. The effect of fluid flow is included, which hitherto often has been ignored. Examples of corrosion models shown are a simple Limiting Corrosion Rate (LCR) model and a more advanced numerical model. The former is based on mass transport considerations, whereas the latter also includes reaction chemistry and electro-chemistry. Linking of corrosion rate predictive models with models for gas/liquid multi-phase flow is dealt with. The (LCR) model provides a theoretical upper limit for the
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Jones, Denny A. "Electrochemical Fundamentals of Cathodic Protection." In CORROSION 1987. NACE International, 1987. https://doi.org/10.5006/c1987-87317.

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Abstract The now well known electrode kinetic or mixed potential theory has found little practical application in cathodic protection, despite its successes in other areas of aqueous corrosion. The theory predicts that corrosion rate is reduced according to the Tafel relationship as a function of cathodic polarization. Thus, the anodic Tafel constant can be used to predict the necessary cathodic polarization to reach any specified corrosion rate. Methods for field and laboratory measurement of the anodic Tafel constant are discussed. Electrode kinetic theory is used to justify controlled const
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Raporty organizacyjne na temat "Diffusion-controlled kinetics"

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Redner, Sidney. Kinetics of Diffusion-Controlled Reactions. Defense Technical Information Center, 1989. http://dx.doi.org/10.21236/ada212161.

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Chutimaworapan, Suchada, Chaiyo Chaichantippayuth, and Areerat Laopaksa. Formulation of pharmaceutical products of Garcinia mangostana Linn. extracts. Chulalongkorn University, 2006. https://doi.org/10.58837/chula.res.2006.32.

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Part I: The purpose of the investigation was to develop the extraction process that was simple, practical and giving high yield. The maceration of dried powder of Garcinia mangostana fruit husk with ethyl acetate gave yellow crystalline powder of mangostin. The yield was calculated as 7.47%. The identification of the Garcinia mangostanahusk extract was carried out by thin-layer chromatography (TLC) and differential scanning calorimetry. The TLC of mangostin was done by using the alumina sheet and ethyl acetate: hexane (3:1) as mobile phase. The Rf value as compared with standard mangostin was
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