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- 07. Selected Conferences on Polymer Science (2)
- Educational Research - Active Learning in Engineering (2)
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- Otto Vogl (2)
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- 04. Personalities in Polymer Science (1)
- Agua potable (1)
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- INDEXED JOURNAL PAPERS (1)
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Articles 1 - 18 of 18
Full-Text Articles in Engineering
Project Catalyst: Promoting Systemic Change In Engineering Education, Brian Hoyt, Michael Hanyak, Margot Vigeant, William Snyder, Maurice Aburdene, Daniel Hyde, E. Mastascusa, Michael Prince
Project Catalyst: Promoting Systemic Change In Engineering Education, Brian Hoyt, Michael Hanyak, Margot Vigeant, William Snyder, Maurice Aburdene, Daniel Hyde, E. Mastascusa, Michael Prince
Maurice Aburdene
No abstract provided.
Project Catalyst: Successes And Frustrations Of Introducing Systemic Change To Engineering Education, Michael Prince, Daniel Hyde, E. Mastascusa, Margot Vigeant, Michael Hanyak, Maurice Aburdene, Brian Hoyt, William Snyder
Project Catalyst: Successes And Frustrations Of Introducing Systemic Change To Engineering Education, Michael Prince, Daniel Hyde, E. Mastascusa, Margot Vigeant, Michael Hanyak, Maurice Aburdene, Brian Hoyt, William Snyder
Maurice Aburdene
No abstract provided.
Institutsdagen At The Royal Institute Of Technology, Stockholm, Sweden, May 3, 2000, Otto Vogl, Ann Christine Albertsson
Institutsdagen At The Royal Institute Of Technology, Stockholm, Sweden, May 3, 2000, Otto Vogl, Ann Christine Albertsson
Otto Vogl
No abstract provided.
Poly Millennial 2000 Hilton Waikoloa Villages, Hawaii, December 9-13, 2000, Otto Vogl, William Daly
Poly Millennial 2000 Hilton Waikoloa Villages, Hawaii, December 9-13, 2000, Otto Vogl, William Daly
Otto Vogl
No abstract provided.
Modelling And Simulation Of Deep-Bed Grain Dryers, Johnner P. Sitompul, Istadi Istadi, I Nyoman Widiasa
Modelling And Simulation Of Deep-Bed Grain Dryers, Johnner P. Sitompul, Istadi Istadi, I Nyoman Widiasa
Istadi
This paper concerns with heterogeneous modeling of deepbed grain dryers based on two-phase model by taking into account coupled heat and mass transfer within grains. This model also consider axial mass and heat dispersion in the fluid phase. The dynamictwo-phase equations are solved numerically by finite difference with alternating direction implicit method algorithm, and then applied to simulate humidity and temperature profile of drying gas across dryers together with moisture content and temperature of grains. The capabilities of these models were compared with experimental data obtained from available literatures, under drying conditions such as temperature and absolute humidity of drying …
Bifurcation Analysis Of Continuous Biochemical Reactor Models, Yongchun Zhang, Michael A. Henson
Bifurcation Analysis Of Continuous Biochemical Reactor Models, Yongchun Zhang, Michael A. Henson
Michael A Henson
The validity of a biochemical reactor model often is evaluated by comparing transient responses to experimental data. Dynamic simulation can be a rather inefficient and ineffective tool for analyzing bioreactor models that exhibit complex nonlinear behavior. Bifurcation analysis is a powerful tool for obtaining a more efficient and complete characterization of the model behavior. To illustrate the power of bifurcation analysis, the steady-state and transient behavior of three continuous bioreactor models consisting of a small number of ordinary differential equations are investigated. Several important features, as well as potential limitations, that are difficult to ascertain via dynamic simulation are disclosed …
Exposición A Fluoruros Del Agua Potable En La Ciudad De Aguascalientes, México, Rodolfo Trejo-Vázquez, Adrian Bonilla-Petriciolet
Exposición A Fluoruros Del Agua Potable En La Ciudad De Aguascalientes, México, Rodolfo Trejo-Vázquez, Adrian Bonilla-Petriciolet
Adrian Bonilla-Petriciolet
Objetivos. Determinar el contenido de fluoruros en todos los pozos de suministro de agua potable de la ciudad de Aguascalientes para establecer el grado de exposición de la población. Métodos. Se determinó el contenido de fluoruros de los 126 pozos de suministro de agua potable de la ciudad de Aguascalientes, México, con el método SPADNS, conforme a las normativas mexicanas NMX-AA-77-1982 y NMX-014-SSAI-1993. Con los datos obtenidos se crearon mapas de isolíneas de concentración que muestran la distribución de esta variable en los mantos freáticos que abastecen a la ciudad de Aguascalientes y se estimaron las dosis de exposición de …
Two-Phase Partitioning Bioreactors In Fermentation Technology, Janusz J. Malinowski
Two-Phase Partitioning Bioreactors In Fermentation Technology, Janusz J. Malinowski
Janusz J. Malinowski
The two-phase partitioning bioreactor concept appears to have a great potential in enhancing the productivity of many bioprocesses. The proper selection of an organic solvent is the key to successful application of this approach in industrial practice. The integration of fermentation and a primary product separation step has a positive impact on the productivity of many fermentation processes. The controlled substrate delivery from the organic to the aqueous phase opens a new area of application of this strategy to biodegradation of xenobiotics. In this review, the most recent advances in the application of two-liquid phase partitioning bioreactors for product or …
Structure Of Alkanoic Acid Stabilized Magnetic Fluids. A Small-Angle Neutron And Light Scattering Analysis, Seif-Eddeen K. Fateen
Structure Of Alkanoic Acid Stabilized Magnetic Fluids. A Small-Angle Neutron And Light Scattering Analysis, Seif-Eddeen K. Fateen
Seif-Eddeen K Fateen
No abstract provided.
Simulations Of Non-Stationary Reactors For The Catalytic Conversion Of Methane To Synthesis Gas, Krzysztof Gosiewski
Simulations Of Non-Stationary Reactors For The Catalytic Conversion Of Methane To Synthesis Gas, Krzysztof Gosiewski
Krzysztof Gosiewski
Mathematical simulation results are compared for several types of reactors for the conversion of methane to synthesis gas via catalytic partial oxidation of methane coupled with the simultaneous steam reforming. The simulations concerned reactors operating under non-stationary conditions, i.e. at a continuous, forced unsteady state. Both reverse-flowreactors with pelletized and monolith catalyst were simulated, and those with the pelletized catalyst, operating under conditions of feed composition cycling. The simulation results were compared with data for similar reactors operating at steady state. The basic process parameters compared include the conversion of methane and oxygen and the selectivities of the products (CO …
Characterisation Of Non-Condensable Sulphur Containing Gases From Kraft Pulp Mills (2), João F. Gomes
Characterisation Of Non-Condensable Sulphur Containing Gases From Kraft Pulp Mills (2), João F. Gomes
João F Gomes
This paper describes work performed on the sampling and analysis of non-condensable gases (NCG) emitted from diffuse sources of a Portuguese Kraft pulp mill, which is the background information for a NCG collection, treatment and disposal system. The variability found in the composition of the gaseous compounds showed the existence of gaseous streams other than typical total reduced sulphur (TRS) compounds as usually described. From the measured TRS concentrations and the gas flow rate from each source it was possible to calculate the emission flow rate, E, of each source. These emission flow rates were then divided into 3 categories …
Gd Promotion Of Co/Sio2 Fischer–Tropsch Synthesis Catalysts, George W. Huber, S. J.M Butala, M. L. Lee, C. H. Bartholomew
Gd Promotion Of Co/Sio2 Fischer–Tropsch Synthesis Catalysts, George W. Huber, S. J.M Butala, M. L. Lee, C. H. Bartholomew
George W. Huber
Addition of Gd to Co/SiO2 Fischer–Tropsch synthesis catalysts (1) increases reducibility to Co metal, (2) decreases CH4 selectivity, (3) increases activity for CO hydrogenation based on the mass of Co, and (4) causes carbon deposition at lower temperatures when compared to the unpromoted catalyst. The intrinsic activity, based on H2 chemisorption surface area, is the same for both unpromoted and promoted catalysts.
4. Bengt Rånby (1920-2000), Otto Vogl, Gerald S. Kirshenbaum
4. Bengt Rånby (1920-2000), Otto Vogl, Gerald S. Kirshenbaum
Otto Vogl
No abstract provided.
Numerical Simulation Of A Gas–Liquid Flow In A Fixed Bed, Ashok S. Sangani, Sangkyun Koo
Numerical Simulation Of A Gas–Liquid Flow In A Fixed Bed, Ashok S. Sangani, Sangkyun Koo
Ashok S. Sangani
A countercurrent gas–liquid flow through a fixed bed of spherical particles is examined numerically by solving the particle-scale equations governing the gas and liquid flows. The liquid is assumed to flow along the surface of the particles forming a thin film. The case of small gas flow rates is examined in detail first. In this limit the presence of the liquid film increases the gas pressure drop over its value for a dry bed by three mechanisms: The liquid film makes the apparent size of the particles larger, decreases the pore space for the gas flow, and, with its velocity …
Attenuation Of Sound In Concentrated Suspensions: Theory And Experiments, Ashok S. Sangani, Peter D. M. Spelt, Michael A. Norato, Margaret S. Greenwood, Lawrence L. Tavarides
Attenuation Of Sound In Concentrated Suspensions: Theory And Experiments, Ashok S. Sangani, Peter D. M. Spelt, Michael A. Norato, Margaret S. Greenwood, Lawrence L. Tavarides
Ashok S. Sangani
Ensemble-averaged equations are derived for small-amplitude acoustic wave propagation through non-dilute suspensions. The equations are closed by introducing effective properties of the suspension such as the compressibility, density, viscoelasticity, heat capacity, and conductivity. These effective properties are estimated as a function of frequency, particle volume fraction, and physical properties of the individual phases using a self-consistent, effective-medium approximation. The theory is shown to be in excellent agreement with various rigorous analytical results accounting for multiparticle interactions. The theory is also shown to agree well with the experimental data on concentrated suspensions of small polystyrene particles in water obtained by Allegra …
Measurements Of The Average Properties Of A Suspension Of Bubbles Rising In A Vertical Channel, Ashok S. Sangani, Roberto Zenit, Donald L. Koch
Measurements Of The Average Properties Of A Suspension Of Bubbles Rising In A Vertical Channel, Ashok S. Sangani, Roberto Zenit, Donald L. Koch
Ashok S. Sangani
Experiments were performed in a vertical channel to study the behaviour of a monodisperse bubble suspension for which the dual limit of large Reynolds number and small Weber number was satisfied. Measurements of the liquid-phase velocity fluctuations were obtained with a hot-wire anemometer. The gas volume fraction, bubble velocity, bubble velocity fluctuations and bubble collision rate were measured using a dual impedance probe. Digital image analysis was performed to quantify the small polydispersity of the bubbles as well as the bubble shape.A rapid decrease in bubble velocity with bubble concentration in very dilute suspensions is attributed to the effects of …
Thermodynamic Analysis Of Thermomechanical Coupling In Tangential Couette Flow Of Temperature Dependent Materials, Yasar Demirel
Thermodynamic Analysis Of Thermomechanical Coupling In Tangential Couette Flow Of Temperature Dependent Materials, Yasar Demirel
YASAR DEMIREL
Thermodynamic analysis of the thermomechanical coupling in a tangential Couette flow is presented for the Nahme number Na range of 0.5 < Na < 2.5. In the analysis, the temperature and velocity gradients, obtained from the series solutions in the Brinkman number Br, have been used for Newtonian fluids whose viscosity and thermal conductivity are expressed as linear functions of temperature. The entropy generation and the irreversibility distributions due to the thermomechanical coupling are evaluated and displayed graphically across the gap with asymmetric wall temperatures for the Couette flow of ethylene glycol.
Construction And Reactivity Mapping Of A Platinum Catalyst Gradient Using The Scanning Electrochemical Microscope, Shrisudersan Jayaraman, Andrew C. Hillier
Construction And Reactivity Mapping Of A Platinum Catalyst Gradient Using The Scanning Electrochemical Microscope, Shrisudersan Jayaraman, Andrew C. Hillier
Andrew C. Hillier
Wedescribe a method for the characterization of electro-oxidation catalysts that involves the fabrication and reactivity mapping of samples possessing a catalyst gradient. The objective of this work is to demonstrate a method for catalyst preparation and screening that directly measures the activity of spatially localized catalyst samples toward electro-oxidation reactions relevant to the fuel cell anode in an effort to discover and characterize new catalyst formulations. In this report, a well-defined gradient in the surface coverage of platinum is created on an electronically conductive but catalytically inactive indium-tin-oxide (ITO) substrate by the application of a nonuniform electric field during platinum …