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404 full-text articles. Page 12 of 14.

Kinetic And Thermodynamic Modeling Of Cd+2 And Ni+2 Biosorption By Raw Chicken Feathers, Hilda E. Reynel-Avila, Guadalupe de la Rosa, Cintia Karina Rojas-Mayorga, Irene Cano-Aguilera, Adrian Bonilla-Petriciolet 2011 Universidad de Guanajuato

Kinetic And Thermodynamic Modeling Of Cd+2 And Ni+2 Biosorption By Raw Chicken Feathers, Hilda E. Reynel-Avila, Guadalupe De La Rosa, Cintia Karina Rojas-Mayorga, Irene Cano-Aguilera, Adrian Bonilla-Petriciolet

Adrian Bonilla-Petriciolet

Batch experiments were performed to model kinetic and thermodynamic data for Cd and Ni biosorption by raw chicken feathers (CFs) under different conditions. Results indicated that Cd and Ni sorption onto CFs occurred on the external surface of the biosorbent. Ion removal increased with pH, whereas both endothermic and exothermic stages where observed depending on temperature. Our calculated thermodynamic parameters showed that, below the temperature of 30°C, the metal uptake of Cd and Ni ions may be mainly controlled by a chemisorption process. However, for temperatures higher than 30°C, it is likely that sorption of both metals onto ...


Integrated Differential Evolution For Global Optimization And Its Performance For Modeling Vapor-Liquid Equilibrium Data, Haibo Zhang, Gade Pandu Rangaiah, Adrian Bonilla-Petriciolet 2011 National University of singapore

Integrated Differential Evolution For Global Optimization And Its Performance For Modeling Vapor-Liquid Equilibrium Data, Haibo Zhang, Gade Pandu Rangaiah, Adrian Bonilla-Petriciolet

Adrian Bonilla-Petriciolet

Parameter estimation in thermodynamic models has been of great interest in chemical engineering due to its complex nature such as non-linearity, flat objective function in the neighborhood of global optimum, badly scaled model and non-differential term(s) in the equations. In this paper, a stochastic global optimization algorithm, named, integrated differential evolution (IDE) is introduced to solve the parameter estimation problems for modeling vapor-liquid equilibrium (VLE) data. In IDE, the choice of mutation strategy and associated parameters are adapted according to the learning experience from previous generations. The tabu list used in IDE can avoid revisiting the same area and ...


Copolimerizacion Injertada De Almidón Con Poli(Acrilonitrilo) Y Acetato De Vinilo Mediante Radicales Libres En Solución: Síntesis Y Caracterización, Jose A. Dena-Aguilar, Juan Jauregui-Rincon, Adrian Bonilla-Petriciolet, Iliana Ernestina Medina-Ramirez, Jorge Romero-Garcia 2011 Instituto Tecnológico de Aguascalientes

Copolimerizacion Injertada De Almidón Con Poli(Acrilonitrilo) Y Acetato De Vinilo Mediante Radicales Libres En Solución: Síntesis Y Caracterización, Jose A. Dena-Aguilar, Juan Jauregui-Rincon, Adrian Bonilla-Petriciolet, Iliana Ernestina Medina-Ramirez, Jorge Romero-Garcia

Adrian Bonilla-Petriciolet

En este estudio, copolímeros injertados de almidón (ALM) con acrilonitrilo (AN) y acetato de vinilo (AV) (PAN-co-ALM) fueron preparados mediante métodos de copolimerización injertada en solución bajo una atmósfera oxidante normal (en presencia de aire). Las reacciones de injerción fueron iniciadas por procesos de radicales libres, empleando persulfato de amonio (PA) y bisulfito de sodio (BS) como iniciadores. Se determinó que el rendimiento de injerción (%G) es dependiente de las concentraciones de almidón y de los iniciadores considerados. Las muestras de copolímeros de PAN-co-ALM fueron caracterizadas por gravimetría, técnicas de espectroscopia infrarroja con transformada de Fourier (FTIR), microscopia electrónica de ...


Short-Cut Method For The Design Of Reactive Distillation Columns, Marcelino Carrera-Rodriguez, Juan Gabriel Segovia-Hernandez, Adrian Bonilla-Petriciolet 2011 Universidad de Guanajuato

Short-Cut Method For The Design Of Reactive Distillation Columns, Marcelino Carrera-Rodriguez, Juan Gabriel Segovia-Hernandez, Adrian Bonilla-Petriciolet

Adrian Bonilla-Petriciolet

The design of Reactive Distillation (RD) has received significant attention due to the technological and economical advantages obtained from the simultaneous occurrence of reaction and separation. Although these advantages of RD are well documented in literature, the commercial applications of RD are still limited because of the control and operation complexity of these separation systems and the need for improving software tools to reliably model and design RD columns. In this study, a robust short-cut method for the design of multicomponent reactive distillation is presented. This method is based on distillation lines and tray-by-tray calculations defined in terms of reaction-invariant ...


A Review On Global Optimization Methods For Phase Equilibrium Modeling And Calculations, Haibo Zhang, Adrian Bonilla-Petriciolet, Gade Pandu Rangaiah 2011 National University of singapore

A Review On Global Optimization Methods For Phase Equilibrium Modeling And Calculations, Haibo Zhang, Adrian Bonilla-Petriciolet, Gade Pandu Rangaiah

Adrian Bonilla-Petriciolet

The phase equilibrium modeling for multi-component systems is essential in process systems engineering. In particular, phase stability analysis, Gibbs free energy minimization and estimation of parameters in thermodynamic models are challenging global optimization problems involved in phase equilibrium calculations and modeling for both reactive and non-reactive systems. To date, many significant works have been performed in the area of global optimization, and several algorithms and computational contributions of global optimization have been used for solving these problems; global optimization methods used include both deterministic and stochastic algorithms. To the best of our knowledge, there is no review in the literature ...


Applications Of A 3-D Cfb Model On Oxycombustion, Gasification And Calcinator In Calcium Looping, Kari Myöhänen, Timo Hyppänen, Markku Nikku, Matti Koski, Jarno Parkkinen 2011 Lappeenranta University of Technology

Applications Of A 3-D Cfb Model On Oxycombustion, Gasification And Calcinator In Calcium Looping, Kari Myöhänen, Timo Hyppänen, Markku Nikku, Matti Koski, Jarno Parkkinen

Kari Myöhänen

No abstract provided.


Termodynamika Procesowa (Dla Me Aparatura Procesowa) Ćw., Wojciech M. Budzianowski 2011 Wroclaw University of Technology

Termodynamika Procesowa (Dla Me Aparatura Procesowa) Ćw., Wojciech M. Budzianowski

Wojciech Budzianowski

No abstract provided.


The Analysis Of Heat Transfer In A Gas-Gas Heat Exchanger Operated Under A Heat-Recirculating Mode, Mariusz Salaniec, Wojciech M. Budzianowski 2011 Wroclaw University of Technology

The Analysis Of Heat Transfer In A Gas-Gas Heat Exchanger Operated Under A Heat-Recirculating Mode, Mariusz Salaniec, Wojciech M. Budzianowski

Wojciech Budzianowski

The present paper presents the analysis of heat transfer in a gas-gas heat exchanger operated in a heat-recirculating mode.


An Overview Of Technologies For Upgrading Of Biogas To Biomethane, Wojciech M. Budzianowski 2011 Wroclaw University of Technology

An Overview Of Technologies For Upgrading Of Biogas To Biomethane, Wojciech M. Budzianowski

Wojciech Budzianowski

The present contribution presents an overview of technologies available for upgrading of biogas to biomethane. Technologies under study include pressure swing adsorption (PSA), high-pressure water wash (HPWW), reactive absorption (RA), physical absorption (PA), membrane separation (MS) and cryogenic separation (CS).


Influence Of Energy Policy On The Rate Of Implementation Of Biogas Power Plants In Germany During The 2001-2010 Decade, Izabela Chasiak, Wojciech M. Budzianowski 2011 Wroclaw University of Technology

Influence Of Energy Policy On The Rate Of Implementation Of Biogas Power Plants In Germany During The 2001-2010 Decade, Izabela Chasiak, Wojciech M. Budzianowski

Wojciech Budzianowski

The current article describes energy policy tools, which caused intensive development of biogas-based power generation in Germany during the 2001-2010 decade. The German system of financial support to biogas power plants is presented in details. It is shown that in Germany, i.e. in a country characterised by similar climate and potentials to renewable energy to Poland, biogas power plants cover 10,7% of electricity demands in 2010, while all renewable energy sources cover only 5,4% of electricity demands. It is emphasised that under favourable Polish energy policy, the development of biogas energy can be very rapid.


Scaling Properties At Freeze-Out In Relativistic Heavy-Ion Collisions, M. M. Aggarwal, Z. Ahammed, A. V. Alakhverdyants, I. Alekseev, J. Alford, B. D. Anderson, S. Bueltmann, I. Koralt, D. Plyku, STAR Collaboration 2011 Old Dominion University

Scaling Properties At Freeze-Out In Relativistic Heavy-Ion Collisions, M. M. Aggarwal, Z. Ahammed, A. V. Alakhverdyants, I. Alekseev, J. Alford, B. D. Anderson, S. Bueltmann, I. Koralt, D. Plyku, Star Collaboration

Physics Faculty Publications

Identified charged pion, kaon, and proton spectra are used to explore the system size dependence of bulk freeze-out properties in Cu+Cu collisions at √sNN=200 and 62.4 GeV. The data are studied with hydrodynamically motivated blast-wave and statistical model frameworks in order to characterize the freeze-out properties of the system. The dependence of freeze-out parameters on beam energy and collision centrality is discussed. Using the existing results from Au + Au and pp collisions, the dependence of freeze-out parameters on the system size is also explored. This multidimensional systematic study furthers our understanding of the QCD phase diagram revealing ...


Piezoelectric Ceramics With Compositions At The Morphotropic Phase Boundary In The Bifeo3–Pbzro3–Pbtio3 Ternary System, Wei Hu, Xiaoli Tan, Krishna Rajan 2011 Iowa State University

Piezoelectric Ceramics With Compositions At The Morphotropic Phase Boundary In The Bifeo3–Pbzro3–Pbtio3 Ternary System, Wei Hu, Xiaoli Tan, Krishna Rajan

Materials Science and Engineering Publications

Since ceramics in the PbZrO3–PbTiO3 binary system display excellent piezoelectric properties and those in BiFeO3–PbTiO3 exhibit high Curie temperatures, morphotropic phase boundary (MPB) compositions in the BiFeO3–PbZrO3–PbTiO3 ternary solid solution system are investigated for the development of piezoelectric ceramics for high temperature applications. It is found that the MPB compositions in the ternary system deviate away from the mixture of two binary MPB compositions 0.70BiFeO3–0.30PbTiO3 and 0.52PbZrO3–0.48PbTiO3. With decreasing amount of BiFeO3 in the MPB compositions in the ...


Applications Of A General Random Walk Theory For Confined Diffusion, Elisa Calvo-Muñoz, Myvizhi Esai Selvan, Ruichang Xiong, Madhusudan Ojha, David Keffer, Donald Nicholson, Takeshi Egami 2010 University of Tennessee - Knoxville

Applications Of A General Random Walk Theory For Confined Diffusion, Elisa Calvo-Muñoz, Myvizhi Esai Selvan, Ruichang Xiong, Madhusudan Ojha, David Keffer, Donald Nicholson, Takeshi Egami

David Keffer

A general random walk theory for diffusion in the presence of nanoscale confinement is developed and applied. The random-walk theory contains two parameters describing confinement: a cage size and a cage-to-cage hopping probability. The theory captures the correct nonlinear dependence of the mean square displacement (MSD) on observation time for intermediate times. Because of its simplicity, the theory also requires modest computational requirements and is thus able to simulate systems with very low diffusivities for sufficiently long time to reach the infinite-time-limit regime where the Einstein relation can be used to extract the self-diffusivity. The theory is applied to three ...


On The Relationship Between The Structure Of Metal-Organic Frameworks And The Adsorption And Diffusion Of Hydrogen, Nethika Suraweera, Ruichang Xiong, J. P. Luna, Donald Nicholson, David Keffer 2010 University of Tennessee - Knoxville

On The Relationship Between The Structure Of Metal-Organic Frameworks And The Adsorption And Diffusion Of Hydrogen, Nethika Suraweera, Ruichang Xiong, J. P. Luna, Donald Nicholson, David Keffer

David Keffer

In this work, the adsorptive and diffusive behaviours of molecular hydrogen in 10 different isoreticular metal–organic frameworks (IRMOFs) are studied using molecular-level simulation. Hydrogen adsorption isotherms and heats of adsorption at 77 and 300 K were generated for 10 MOFs at low-pressure conditions (up to 10 bar) using Path Integral Grand Canonical Monte Carlo simulations. Self-diffusivities and activation energies for diffusion were generated using molecular dynamics simulation. Density distributions showing the location and the shape of the adsorption sites are also provided. Statistical correlations for all of the properties as a function of surface area (SA), accessible volume (AV ...


Evaluation Of Integrated Differential Evolution And Unified Bare-Bone Particle Swarm Optimization On Phase And Chemical Equilibrium And Phase Stability Problems, Haibo Zhang, Jorge A. Fernandez-Vargas, Gade Pandu Rangaiah, Adrian Bonilla-Petriciolet, Juan Gabriel Segovia-Hernández 2010 National University of singapore

Evaluation Of Integrated Differential Evolution And Unified Bare-Bone Particle Swarm Optimization On Phase And Chemical Equilibrium And Phase Stability Problems, Haibo Zhang, Jorge A. Fernandez-Vargas, Gade Pandu Rangaiah, Adrian Bonilla-Petriciolet, Juan Gabriel Segovia-Hernández

Adrian Bonilla-Petriciolet

Phase equilibrium calculations and phase stability analysis play a significant role in the simulation, design and optimization of separation processes in chemical engineering. These are very challenging problems due to the high non-linearity of thermodynamic models. Global optimization methods are required in order to solve these complex, non-convex optimization problems. Recently, stochastic global optimization algorithms were applied to solve these problems. However, these optimization methods have some parameters that need to be tuned in order to obtain good reliability and efficiency. In this study, we introduce three global optimization algorithms developed by our group for phase and chemical equilibrium calculations ...


Do Surfaces With Mixed Hydrophilic And Hydrophobic Areas Enhance Pool Boiling?, Amy Rachel Betz, Jie Xu, Huihe Qiu, Daniel Attinger 2010 Columbia University

Do Surfaces With Mixed Hydrophilic And Hydrophobic Areas Enhance Pool Boiling?, Amy Rachel Betz, Jie Xu, Huihe Qiu, Daniel Attinger

Daniel Attinger

We demonstrate that smooth and flat surfaces combining hydrophilic and hydrophobicpatterns improve pool boiling performance. Compared to a hydrophilicsurface with 7° wetting angle, the measured critical heat flux and heat transfer coefficients of the enhanced surfaces are, up to respectively, 65% and 100% higher. Different networks combining hydrophilic and hydrophobic regions are characterized. While all tested networks enhance the heat transfer coefficient, large enhancements of critical heat flux are typically found for hydrophilic networks featuring hydrophobic islands. Hydrophilic networks indeed are shown to prevent the formation of an insulating vapor layer.


Energetyka Niskoemisyjna, Wojciech M. Budzianowski 2010 Wroclaw University of Technology

Energetyka Niskoemisyjna, Wojciech M. Budzianowski

Wojciech Budzianowski

No abstract provided.


Interfacial Temperature Measurements, High-Speed Visualization And Finite-Element Simulations Of Droplet Impact And Evaporation On A Solid Surface, Rajneesh Bhardwaj, Jon P. Longtin, Daniel Attinger 2010 Columbia University

Interfacial Temperature Measurements, High-Speed Visualization And Finite-Element Simulations Of Droplet Impact And Evaporation On A Solid Surface, Rajneesh Bhardwaj, Jon P. Longtin, Daniel Attinger

Daniel Attinger

The objective of this work is to investigate the coupling of fluid dynamics, heat transfer and mass transfer during the impact and evaporation of droplets on a heated solid substrate. A laser-based thermoreflectance method is used to measure the temperature at the solid–liquid interface, with a time and space resolution of 100 μs and 20 μm, respectively. Isopropanol droplets with micro- and nanoliter volumes are considered. A finite-element model is used to simulate the transient fluid dynamics and heat transfer during the droplet deposition process, considering the dynamics of wetting as well as Laplace and Marangoni stresses on the ...


Computer Simulation Of A Biomass Gasification-Solid Oxide Fuel Cell Power System Using Aspen Plus, Wayne Doherty, Anthony Reynolds, David Kennedy 2010 Technological University Dublin

Computer Simulation Of A Biomass Gasification-Solid Oxide Fuel Cell Power System Using Aspen Plus, Wayne Doherty, Anthony Reynolds, David Kennedy

Articles

The operation and performance of a solid oxide fuel cell (SOFC) stack on biomass syn-gas from a biomass gasification combined heat and power (CHP) plant is investigated. The objective of this work is to develop a model of a biomass-SOFC system capable of predicting performance under diverse operating conditions. The tubular SOFC technology is selected. The SOFC stack model, equilibrium type based on Gibbs free energy minimisation, is developed using Aspen Plus. The model performs heat and mass balances and considers ohmic, activation and concentration losses for the voltage calculation. The model is validated against data available in the literature ...


Sorting Of Amphiphile Membrane Components In Curvature And Composition Gradients, Aiwei Tian 2010 Upenn

Sorting Of Amphiphile Membrane Components In Curvature And Composition Gradients, Aiwei Tian

Publicly Accessible Penn Dissertations

Phase and shape heterogeneities in biomembranes are of functional importance. However, it is difficult to elucidate the roles membrane heterogeneities play in maintaining cellular function due to the complexity of biomembranes. Therefore, investigations of phase behavior and composition/curvature coupling in lipid and polymer model membranes offer some advantages.

In this thesis, phase properties in lipid and polymer giant vesicles were studied. Line tension at the fluid/fluid phase boundary of giant lipid unilamellar vesicles was determined directly by micropipette aspiration, and found to be composition-dependent. Dynamics of calcium-induced domains within polyanionic vesicles subject to chemical stimuli were investigated, which ...


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