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Influence Of Socio-Demography And Operating Streetscape On Last-Mile Mode Choice, M. Meng, P. P. Koh, Y. D. Wong 2016 TUM CREATE

Influence Of Socio-Demography And Operating Streetscape On Last-Mile Mode Choice, M. Meng, P. P. Koh, Y. D. Wong

Journal of Public Transportation

This study investigated how personal and operational factors (travel distance and streetscape) influence traveler mode choice decisions for the last-mile home-bound trip stage from rail transit stations. Personal factors include the socio-demography of travelers, and attributes of the streetscape include the built environment (degree of areal development), prevalence of cycling, availability of short-range transport modes, and walking/cycling infrastructure. Interviewers randomly intercepted pedestrians to administer a mode choice survey at five rail transit station exits and engaged all available cyclists at bicycle parking areas in the vicinity of stations in Singapore. A multimodal logit regression model revealed a significant relationship ...


Hybrid Sulfur Process For Solar Production Of Hydrogen, John Jacob Isenhower, Katherine Cross Henderson, Nicholas Joseph Eigenbrot 2016 University of South Carolina - Columbia

Hybrid Sulfur Process For Solar Production Of Hydrogen, John Jacob Isenhower, Katherine Cross Henderson, Nicholas Joseph Eigenbrot

Theses and Dissertations

Lowering dependence on fossil-based fuels has become a major area of focus in research, especially in transportation fuels. One particularly interesting field is that of hydrogen production. Hydrogen is promising because it has the potential to emit no greenhouse gases when used as fuel and is an excellent vessel for energy storage. Because traditional methods for its generation are inefficient and require nonrenewable fuel use, researchers have begun to focus on thermochemical cycles.

Thermochemical cycles are systems that require heat transfer intrinsically and do not consume fossil fuels nor emit greenhouse gases if renewable energy is used for heating. The ...


Investigation On Effect Of Acid Wash With Thermocol Ball On Physical Properties Of Knitted Garments, Elias Khalil 2016 World University of Bangladesh (WUB)

Investigation On Effect Of Acid Wash With Thermocol Ball On Physical Properties Of Knitted Garments, Elias Khalil

Textile Engineering

Washing is considered as the final process of garments finishing. Acid washing is one kind of finishing treatment used for making sewn garments aesthetic, fashionable, soft, comfortable and also adding value to the final garments. This paper investigates the effect of the acid washing (with thermocol balls and potassium permanganate) on different physical properties of three knitted garments (Single Jersey 100% Cotton T-shirt, Single Jersey 95% Cotton 5% Spandex T-Shirt and 1 × 1 Rib100% Cotton T-Shirt). Typical washing procedures and techniques were followed and then physical properties were analyzed under standard condition. It is observed that fabric weight, CPI, WPI ...


Catalytic Co2 Hydrogenation - Literature Review: Technology Development Since 2014, Drayson Bratt 2016 University of Wyoming

Catalytic Co2 Hydrogenation - Literature Review: Technology Development Since 2014, Drayson Bratt

Chemical Engineering Plan B

Global atmospheric carbon dioxide (CO2) concentration from fossil fuel combustion has generated much concern because of the several environmental issues associated with high levels of atmospheric CO2, a major greenhouse gas. In order to reduce the risks associated with global warming, the increase in atmospheric CO2 concentration must be prevented. CO2 capture and conversion not only mitigates the risks associated with increasing CO2 concentration in the atmosphere, but also addresses the problem of fossil fuel depletion by providing sustainable production of industrial demanded fuels and chemicals.

This literature review analyzes several of the most promising ...


Mechanical Properties Of Poly (Vinyl Alcohol) Based Blends And Composites, Nazanin Afghan 2016 The University of Western Ontario

Mechanical Properties Of Poly (Vinyl Alcohol) Based Blends And Composites, Nazanin Afghan

Electronic Thesis and Dissertation Repository

One of the most important product specifications in design of materials for different applications is to closely match desired mechanical properties of the target. The soft tissue could be very elastic such as blood vessels and skin, whereas others are soft and non-elastic such as fat tissue. Soft human tissue has a diverse structural component that give them the different feel, texture, shape, and mechanical properties.

Poly (vinyl alcohol) (PVA) as hydrophobic polymer has outstanding features such as very good physico-mechanical properties, nontoxicity and biocompatibility, and high swelling properties which makes them favorable for biomaterial and biomedical applications. By physically ...


Polymer System And Molding Techniques For Surgical Training Models, Daniel J. Park 2016 The University of Western Ontario

Polymer System And Molding Techniques For Surgical Training Models, Daniel J. Park

Electronic Thesis and Dissertation Repository

Poly(vinyl alcohol) (PVA) hydrogels are used to produce high fidelity models for surgical training applications. PVA hydrogel mechanical properties are developed through the use of a freeze-thaw cycling, physical crosslinking process. The resulting gels exhibit a non-linear elastic modulus which can be tailored to match many tissues of the human body.

Methods for joining PVA hydrogels were investigated to aid in the production of complicated structures that would be difficult to produce in a single step. Bond strength of PVA gels was characterized using a modified peel test. The porosity and degree of crosslinking of the PVA substrate were ...


Biomolecular Interactions Control The Shape Of Stains From Drying Droplets Of Complex Fluids, Cedric Hurth, Ranjeesh Bhardwaj, Sahar Andalib, Christophe Frankiewicz, Andrew Dobos, Daniel Attinger, Frederic Zenhausern 2016 University of Arizona

Biomolecular Interactions Control The Shape Of Stains From Drying Droplets Of Complex Fluids, Cedric Hurth, Ranjeesh Bhardwaj, Sahar Andalib, Christophe Frankiewicz, Andrew Dobos, Daniel Attinger, Frederic Zenhausern

Daniel Attinger

When a sessile droplet of a complex fluid dries, a stain forms on the solid surface. The structure and pattern of the stain can be used to detect the presence of a specific chemical compound in the sessile droplet. In the present work, we investigate what parameters of the stain or its formation can be used to characterize the specific interaction between an aqueous dispersion of beads and its receptor immobilized on the surface. We use the biotin-streptavidin system as an experimental model. Clear dissimilarities were observed in the drying sequences on streptavidin-coated substrates of droplets of aqueous solutions containing ...


Texture And Wettability Of Metallic Lotus Leaves, Christophe Frankiewicz, Daniel Attinger 2016 Iowa State University

Texture And Wettability Of Metallic Lotus Leaves, Christophe Frankiewicz, Daniel Attinger

Daniel Attinger

Superhydrophobic surfaces with the self-cleaning behavior of lotus leaves are sought for drag reduction and phase change heat transfer applications. These superrepellent surfaces have traditionally been fabricated by random or deterministic texturing of a hydrophobic material. Recently, superrepellent surfaces have also been made from hydrophilic materials, by deterministic texturing using photolithography, without low-surface energy coating. Here, we show that hydrophilic materials can also be made superrepellent to water by chemical texturing, a stochastic rather than deterministic process. These metallic surfaces are the first analog of lotus leaves, in terms of wettability, texture and repellency. A mechanistic model is also proposed ...


Visible Light Driven Photocatalysis For Degradation Of Diclofenac, Noshin Hashim 2016 The University of Western Ontario

Visible Light Driven Photocatalysis For Degradation Of Diclofenac, Noshin Hashim

Electronic Thesis and Dissertation Repository

Diclofenac (DCF), a widely used non-steroidal anti-inflammatory drug (NSAID), is a commonly detected substance that readily accumulates in tissues of aquatic fish and poses a threat to wildlife and freshwater quality. Advanced Oxidation Processes (AOPs) have been explored as an alternative method for complete mineralization of DCF as conventional treatment methods are inadequate for treatment of trace contaminants.

This study employs a semi-batch, swirl-flow, monolithic type photocatalytic reactor to determine intrinsic kinetic parameters of DCF mineralization, in an immobilized system under both UV and visible radiation. The goal of this work to determine true kinetics of DCF, after correcting for ...


Minor Whey Protein Purification Using Ion-Exchange Column Chromatography, Naeimeh Faraji Dizaji 2016 The University of Western Ontario

Minor Whey Protein Purification Using Ion-Exchange Column Chromatography, Naeimeh Faraji Dizaji

Electronic Thesis and Dissertation Repository

This thesis is concerned with application of mechanistic models for recovery and purification of two minor milk proteins to develop an efficient and robust process. A fundamental and quantitative understanding of the underlying mechanisms assists to evaluate chances and challenges in non-linear chromatography.

The first chapter considers adsorption isotherm data of two minor whey proteins on cation exchanger under various conditions and used as the basis to develop a predictive approach for correlating adsorption behavior using a mechanistic isotherm model. The SMA isotherm model explicitly considers the contributions of protein-adsorbent and protein-protein interactions in the simulation of salt gradients in ...


Treatment Of Landfill Waste, Leachate And Landfill Gas: Modelling/Simulation And Experimental Studies, Hecham M. Omar 2016 The University of Western Ontario

Treatment Of Landfill Waste, Leachate And Landfill Gas: Modelling/Simulation And Experimental Studies, Hecham M. Omar

Electronic Thesis and Dissertation Repository

Landfilling has been relegated to containing waste and hoping for minimal environmental impact. However, landfills produce harmful leachate and landfill gas that require treatment. To speed up the landfill biodegradation process, aerating the landfill to promote aerobic biodegradation has been implemented successfully. However, the conversion from a traditional anaerobic landfill to an aerobic landfill is to this point, not well researched. A 3-dimensional dynamic mathematical model was developed that depicts the conversion of a landfill from an anaerobic to an aerobic operation. The results of the model (CO2 volume fraction and temperature), agreed with data from published work. The ...


Method For Recovering Sulfur Dioxide From A Gas Stream, Thomas D. Wheelock, David R. Boylan 2016 Iowa State University

Method For Recovering Sulfur Dioxide From A Gas Stream, Thomas D. Wheelock, David R. Boylan

Thomas D. Wheelock

This invention relates to the reductive decomposition of calcium sulfate, and more particularly to a procedure by which calcium sulfate is reduced to produce lime and sulfur in a readily convertible form, i.e., sulfur dioxide.


Reductive Decomposition Of Calium Sulfate, Thomas D. Wheelock, David R. Boylan 2016 Iowa State College

Reductive Decomposition Of Calium Sulfate, Thomas D. Wheelock, David R. Boylan

Thomas D. Wheelock

This invention relates to the reductive decomposition of calcium sulfate and more particularly to a procedure by which calcium sulfate is reduced to produce lime and sulfur in. a readily convertible form, i.e., sulfur dioxide.


Process For Producing Low-Ash, Low-Sulfur Coal, Thomas D. Wheelock 2016 Iowa State College

Process For Producing Low-Ash, Low-Sulfur Coal, Thomas D. Wheelock

Thomas D. Wheelock

Pyritic sulfur, organic sulfur, and ash-forming minerals are removed from coal by a 2-stage alkaline treatment, using sodium carbonate or bicarbonate as the reagent. The first stage is an alkaline oxidation at moderate temperatures (130°-150° C.), and the second stage is a non-oxidizing alkaline treatment at a much higher temperature (250°-330° C.). The alkaline treated coal is extracted with an aqueous mineral acid, preferably hot aqueous sulfuric acid (H2 SO4) followed by washing with hot water. The resulting low-ash, low-sulfur coal can be used as a fuel in oil-firing boilers, and for similar applications where minimal-ash ...


Simultaneous Reductive And Oxidative Decomposition Of Calcium Sulfate In The Same Fluidized Bed, Thomas D. Wheelock 2016 Iowa State University

Simultaneous Reductive And Oxidative Decomposition Of Calcium Sulfate In The Same Fluidized Bed, Thomas D. Wheelock

Thomas D. Wheelock

Calcium sulfate is decomposed to CaO and SO2 by high temperature treatment in a fluidized bed wherein reductive and oxidative conditions are simultaneously maintained. A highly reducing gas is formed in the lower portion of the bed from partial combustion of the fuel in admixture with the primary fluidizing air. The quantity of the primary fluidizing air is limited so that the reducing conditions in the lower zone converts the CaSO4 to a mixture of CaO and CaS. Secondary air is introduced at a higher level in the bed to create an oxidizing zone in the upper portion ...


Development Of A Cao-Based Co2 Sorbent With Improved Cyclic Stability, Karl O. Albrecht, Kyle S. Wagenbach, Justinus A. Satrio, Brent H. Shanks, Thomas D. Wheelock 2016 Iowa State University

Development Of A Cao-Based Co2 Sorbent With Improved Cyclic Stability, Karl O. Albrecht, Kyle S. Wagenbach, Justinus A. Satrio, Brent H. Shanks, Thomas D. Wheelock

Thomas D. Wheelock

The carbonation of CaO is an attractive method for removing CO2 from hot gas mixtures. However, regeneration and reuse of a CaO-based sorbent causes a gradual decline in absorption capacity, which ultimately limits the life of the material. Various methods have been proposed for increasing the life cycle performance of a CaO-based sorbent. Two of these methods were selected for further investigation. One method incorporates an “inert” material in the sorbent, while a second method stabilizes the sorbent through controlled sintering. Promising results were achieved with both methods when they were applied separately to a sorbent derived from a natural ...


A Combined Catalyst And Sorbent For Enhancing Hydrogen Production From Coal Or Biomass, Justinus A. Satrio, Brent H. Shanks, Thomas D. Wheelock 2016 Iowa State University

A Combined Catalyst And Sorbent For Enhancing Hydrogen Production From Coal Or Biomass, Justinus A. Satrio, Brent H. Shanks, Thomas D. Wheelock

Thomas D. Wheelock

Future large-scale production of H2 for use as a clean fuel will likely depend upon gasifying coal or biomass followed by steam reforming the resulting gas mixture and separating the CO2 byproduct. The process of steam reforming and CO2 separation can be greatly simplified by utilizing a new material that combines a reforming catalyst with a sorbent for CO2. Such a material was prepared in the form of small pellets with cores made of calcium and magnesium oxides and shells made largely of alumina impregnated with a nickel catalyst. Subsequent laboratory performance tests of the material showed that CO, CH4 ...


L.K. Doraiswamy Of Iowa State University, Thomas D. Wheelock, Peter J. Reilly 2016 Iowa State University

L.K. Doraiswamy Of Iowa State University, Thomas D. Wheelock, Peter J. Reilly

Thomas D. Wheelock

No abstract provided.


A Reusable Calcium-Based Sorbent For Desulfurizing Hot Coal Gas, Thomas D. Wheelock, David J. L. Hasler 2016 Iowa State University

A Reusable Calcium-Based Sorbent For Desulfurizing Hot Coal Gas, Thomas D. Wheelock, David J. L. Hasler

Thomas D. Wheelock

There is a continuing need for an inexpensive, regenerable sorbent for desulfurizing hot coal gas. Such a material is needed especially for advanced power generating systems including integrated gasification combined-cycle (IGCC) systems and other systems which employ various topping cycles. Maximum power generation efficiency can be achieved by cleaning the gas at nearly gasifier outlet temperatures which can range up to 1200 K or more.


Development Of A Novel Combined Catalyst And Sorbent For Hydrocarbon Reforming, Justinus A. Satrio, Brent H. Shanks, Thomas D. Wheelock 2016 Iowa State University

Development Of A Novel Combined Catalyst And Sorbent For Hydrocarbon Reforming, Justinus A. Satrio, Brent H. Shanks, Thomas D. Wheelock

Thomas D. Wheelock

A combined catalyst and sorbent was prepared and utilized for steam reforming methane and propane in laboratory-scale systems. The material was prepared in the form of small spherical pellets having a layered structure such that each pellet consisted of a highly reactive lime or dolime core enclosed within a porous but strong protective shell made of alumina in which a nickel catalyst was loaded. The material served two functions by catalyzing the reaction of hydrocarbons with steam to produce hydrogen while simultaneously absorbing carbon dioxide formed by the reaction. The in situ removal of CO 2 shifted the reaction equilibrium ...


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