Search Results - "Leal, M.M."

Accelerating Reactive Transport Modeling: On-Demand Machine Learning Algorithm for Chemical Equilibrium Calculations by Leal, Allan M. M., Kyas, Svetlana, Kulik, Dmitrii A., Saar, Martin O.

“…During reactive transport modeling, the computing cost associated with chemical equilibrium calculations can be 10 to 10,000 times higher than that of fluid…”
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High-Impedance Fault Identification Using Cyclostationary Characteristic Analysis by Souza, F.P., Silveira, L.F.Q., Costa, F.B., Leal, M.M.

“…•The High-Impedance Fault can cause deaths of people and animals.•The cyclostationary analysis extracts information from the signals.•The noise has a minimized…”
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Mathematical development of the sampling frequency effects for improving the two-terminal traveling wave-based fault location by Costa, F.B., Lopes, F.V., Silva, K.M., Dantas, K.M.C., França, R.L.S., Leal, M.M., Ribeiro, R.L.A.

“…•The sampling frequency effects on the two-terminal traveling wave-based fault location method.•The sampling frequency effects are represented by lozenges in a…”
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Inverse chemical equilibrium problems: General formulation and algorithm by Leal, Allan M.M., Smith, William R.

“…•Chemical equilibrium problems can be classified as forward or inverse problems.•Temperature, pressure, and element amounts are inputs in the forward…”
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Eritema ab igne inducido por manta eléctrica by Leal-Lobato, M.M, Blasco-Morente, G

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Stoichiometric and non-stoichiometric methods for modeling gasification and other reaction equilibria: A review of their foundations and their interconvertibility by Smith, William R., Tahir, Hamdah, Leal, Allan M.M.

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Implementing an Equation of State without Derivatives: teqp by Bell, Ian H, Deiters, Ulrich K, Leal, Allan M. M

“…This work uses advanced numerical techniques (complex differentiation and automatic differentiation) to efficiently and accurately compute all the required…”
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Efficient chemical equilibrium calculations for geochemical speciation and reactive transport modelling by Leal, Allan M.M., Blunt, Martin J., LaForce, Tara C.

“…Chemical equilibrium calculations are essential for many environmental problems. It is also a fundamental tool for chemical kinetics and reactive transport…”
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GeoProp: A thermophysical property modelling framework for single and two-phase geothermal geofluids by Merbecks, Tristan, Leal, Allan M.M., Bombarda, Paola, Silva, Paolo, Alfani, Dario, Saar, Martin O.

“…The techno-economic evaluation of geothermal resources requires knowledge of the geofluid's thermophysical properties. While the properties of pure water and…”
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Accelerated reactive transport simulations in heterogeneous porous media using Reaktoro and Firedrake by Kyas, Svetlana, Volpatto, Diego, Saar, Martin O., Leal, Allan M. M.

“…This work investigates the performance of the on-demand machine learning (ODML) algorithm introduced in Leal et al. ( Transp. Porous Media 133 (2), 161–204,…”
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Towards a Model-Based Interpretation of Measurements of Mineralogical and Chemical Compositions by Hauser, Juerg, Miron, George D., Kyas, Svetlana, Leal, Allan M. M., Gunning, James

“…We introduce a new methodology for inference of fluid composition from measurements of mineralogical or chemical compositions, expanding upon the use of…”
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A chemical kinetics algorithm for geochemical modelling by Leal, Allan M.M., Blunt, Martin J., LaForce, Tara C.

“…•A novel chemical kinetics algorithm for geochemical modelling.•The algorithm supports both equilibrium and kinetically-controlled reactions.•The equilibrium…”
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Computational methods for reactive transport modeling: A Gibbs energy minimization approach for multiphase equilibrium calculations by Leal, Allan M.M., Kulik, Dmitrii A., Kosakowski, Georg

“…•We present a numerical method for chemical equilibrium calculations based on a Gibbs energy minimization approach.•The method is capable of determining the…”
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Enabling Gibbs energy minimization algorithms to use equilibrium constants of reactions in multiphase equilibrium calculations by Leal, Allan M.M., Kulik, Dmitrii A., Saar, Martin O.

“…The geochemical literature provides numerous thermodynamic databases compiled from equilibrium constants of reactions. These databases are typically used in…”
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Computational methods for reactive transport modeling: An extended law of mass-action, xLMA, method for multiphase equilibrium calculations by Leal, Allan M.M., Kulik, Dmitrii A., Kosakowski, Georg, Saar, Martin O.

“…•We present a multiphase chemical equilibrium method based on an extended law of mass-action (xLMA) approach directly derived from the fundamental Gibbs energy…”
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Thermodynamic Properties of Aqueous Species Calculated Using the HKF Model: How Do Different Thermodynamic and Electrostatic Models for Solvent Water Affect Calculated Aqueous Properties? by Miron, George D., Yapparova, Alina, Leal, Allan M. M.

“…Thermodynamic properties of aqueous species are essential for modeling of fluid-rock interaction processes. The Helgeson-Kirkham-Flowers (HKF) model is widely…”
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A robust and efficient numerical method for multiphase equilibrium calculations: Application to CO2–brine–rock systems at high temperatures, pressures and salinities by Leal, Allan M.M., Blunt, Martin J., LaForce, Tara C.

“…► We develop a method for chemical equilibrium calculations in multiphase systems. ► We show that the method is capable of determining the stable phase…”
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Calculating thermophysical fluid properties during geothermal energy production with NESS and Reaktoro by Walsh, Stuart D.C., Garapati, Nagasree, Leal, Allan M.M., Saar, Martin O.

“…•We account for brines of arbitrary composition in geothermal plant simulations.•Brines from geothermal sites around the globe are simulated using the…”
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Fine-structure constant constraints on Bekenstein-type models by Leal, P. M. M., Martins, C. J. A. P., Ventura, L. B.

“…Astrophysical tests of the stability of dimensionless fundamental couplings, such as the fine-structure constant alpha , are an area of much increased recent…”
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