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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 ...


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 ...


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 ...


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 ...


Synthesis Of Ptcuco Ternary Alloy Using Laser Ablation Synthesis In Solution-Galvanic Replacement Reaction (Lasis-Grr), Kangmin Cheng 2016 University of Tennessee, Knoxville

Synthesis Of Ptcuco Ternary Alloy Using Laser Ablation Synthesis In Solution-Galvanic Replacement Reaction (Lasis-Grr), Kangmin Cheng

EURēCA: Exhibition of Undergraduate Research and Creative Achievement

Laser ablation synthesis in solution in tandem with galvanic replacement reaction (LASiS-GRR) is a newly-developed, facile and environmental friendly synthesis technique for manufacturing a variety of complex nanostructures including hydroxides, metal/metal oxides nanocomposites (NCs), metal-metal nanoalloys (NAs), core-shell nanostructures, etc. This synthetic technique incorporates both “top-down” pulsed laser ablation synthesis in solution approach (LASiS) and the “bottom-up” chemical reduction method (CRM). The setup houses a Q-switched Nd:YAG pulsed laser (1064 nm) with the laser beam focused at a metal target in liquid medium inside a sealed stainless steel reactor cell. The cell is mounted with a gas inlet ...


A Model For Complex Heat And Mass Transport Involving Porous Media With Related Applications, Furqan A. Khan 2016 The University of Western Ontario

A Model For Complex Heat And Mass Transport Involving Porous Media With Related Applications, Furqan A. Khan

Electronic Thesis and Dissertation Repository

Heat and mass transfer involving porous media is prevalent in, for example, air-conditioning, drying, food storage, and chemical processing. Such applications require non-equilibrium heat and mass (or moisture) transfer modeling inside porous media in conjugate fluid/porous/solid framework. Moreover, modeling of turbulence and turbulent heat and mass transfer becomes essential for many applications. A comprehensive literature review shows a scarcity of models having such capabilities. In this respect, the objectives of the present thesis are to: i) develop a formulation that simulates non-equilibrium heat and mass transfer in conjugate fluid/porous/solid framework, ii) demonstrate the capabilities of the ...


Effect Of Packaging Material On Color Properties Of Catsup Tomato Sauce, Naser Kohan-nia, Babak Pakbin, Razzagh Mahmoudi, Omid Fakhri 2016 Department of Food Health and Safety, School of Health, Qazvin University of Medical Sciences, Qazvin, Iran

Effect Of Packaging Material On Color Properties Of Catsup Tomato Sauce, Naser Kohan-Nia, Babak Pakbin, Razzagh Mahmoudi, Omid Fakhri

Journal of Applied Packaging Research

Catsup and tomato sauce products currently are one of the most popular and commercially available table sauces particularly consumed by young people and families around the world in recent decades. In this study colorimetric properties of catsup sauce samples including L*, a* and b* values in different packaging materials including PP, PE, PET, Glass and Sachet have been investigated during and after 180 days storage time at 22̊ C (environmental temperature). Hunter Lab system has been used to evaluate the color values of sauce samples. According to obtained results of experimental measurements and sensory evaluations, PP and PE packaging materials ...


Brain Tumor In A Dish: Glioma/Astrocyte Co-Cultures As A Model For In Vitro Studies, Erin Eickman, Christina Wilson, Srivatsan Kidambi 2016 University of Nebraska-Lincoln

Brain Tumor In A Dish: Glioma/Astrocyte Co-Cultures As A Model For In Vitro Studies, Erin Eickman, Christina Wilson, Srivatsan Kidambi

UCARE Research Products

This study seeks to engineer an in vitro co-culture model to elucidate the role of glioma-astrocyte interactions on molecular changes in the tumor microenvironment. The use of patterned co-cultures created with polyelectrolyte multilayers and micromolding in capillaries will allow tthe investigation of cell-cell communication. This study will lead to better understanding of the role of healthy cells in cancer progression and potential treatment options.


Novel Nitroxyl Radical Synthesis, Max Meier 2016 University of Nebraska-Lincoln

Novel Nitroxyl Radical Synthesis, Max Meier

UCARE Research Products

The purpose of this research is to synthesize a novel compound, 2,2,6,6-dispirocyclobutylpiperidine- 4-one (P), for use as an oxidation reactant to form the corresponding nitroxyl radical. This is to be conducted using a reliable method for a variety of 2,2,6,6-tetrasubstituted piperidine-4-one compounds as detailed by Sakai et al. [3]. Sakai uses a variety of 6-member cyclic ketones, which are quite stable. It was attempted to use 4-member cyclic ketones to research the effectiveness of 2,6-substitution using a less stable carbonyl compound. Cyclobutanone and 3-oxycetanone were used as candidates for this reaction. Both are ...


Investigation Of A Nanoparticle Delivery System For Micronutrients In Corn, Zully Perez Sierra, Zachary P. Stewart, Hendrik Viljoen 2016 University of Nebraska - Lincoln

Investigation Of A Nanoparticle Delivery System For Micronutrients In Corn, Zully Perez Sierra, Zachary P. Stewart, Hendrik Viljoen

UCARE Research Products

Pheroid Nanoparticle Delivery System1 • Cost effective for plant applications • Safe – multi-lamellar lipid system derived mostly from soybeans • Versatile – payloads delivered range from micronutrients to antibiotics Micronutrient Deficiency • Caused by the immobility of micronutrients through the plant. • Leads to malnutrition children in poor countries2 • As fertilizers deliver nutrients, only small percentage obtained by plant. Purpose of Nanoparticle Delivery System • Increase plant micronutrient content and yield • Reduces the effects of run-of, overuse and pollution Other Nano-Fertilizer Trials • Desert plant results – in a foliar application versus irrigation application, the foliar nano-fertilizer was 40% more effective. • Cucumber plant results – demonstrated increased yield and length ...


Mgcl2 And Kcl Recovery From Brine Wastewater, Arthur M. Rempel, Kyra G. Berger, Elyssa A. Gensib, Aspen N. Walker 2016 University of Pennsylvania

Mgcl2 And Kcl Recovery From Brine Wastewater, Arthur M. Rempel, Kyra G. Berger, Elyssa A. Gensib, Aspen N. Walker

Senior Design Reports (CBE)

This project’s aim was to design an improved brine wastewater treatment system for desalination facilities. While a multitude of methods exist to do so, General Electric (GE)’s brine concentrator is leading the market by providing a method that not only treats the brine waste, but also recovers anywhere from 60- 94% of the water from the feed. However, their brine concentrator is relatively inefficient from both a financial and energetic perspective; our goal was to develop a system to match their results, while limiting costs and energy usage as best possible.

We subsequently designed a system (referred to ...


Propane Dehydrogenation By Autothermal Reforming, Jeffrey W. Barsamian, Jayant A. Rao, Patrick J. Staiber, Eric Wamakima 2016 University of Pennsylvania

Propane Dehydrogenation By Autothermal Reforming, Jeffrey W. Barsamian, Jayant A. Rao, Patrick J. Staiber, Eric Wamakima

Senior Design Reports (CBE)

The proposed design is for the the production of propene through propane dehydrogenation using Thyssen Krupp’s STAR technology and a hybrid membrane separation. The plant has a capacity of 700 kT/yr and will be located in the Middle East. At current propane/propene prices, the use of Thyssen Krupp’s STAR process and hybrid membrane separation is not economical and has a negative IRR. The NPV of this project at current market prices is -$865MM. However, economic feasibility depends on volatile market conditions. The process begins with the oxydehydrogenation section, consisting of four reformers connected to four oxyreactors ...


Production Of Propylene Oxide From Propylene Using Patented Silver Based Catalyst, Eric W. Schultz, Mitchell B. Schwartz, Kyle M. Yu 2016 University of Pennsylvania

Production Of Propylene Oxide From Propylene Using Patented Silver Based Catalyst, Eric W. Schultz, Mitchell B. Schwartz, Kyle M. Yu

Senior Design Reports (CBE)

Propylene oxide (PO) is an important intermediate in the manufacture of propylene glycol (PG), polyether polyols and many other products. Conventional production of propylene oxide has many drawbacks. The most common method, the chlorohydrin process produces chlorinated by products which must be disposed of. Other processes produce a co-product, like styrene, which adversely affects production economics. A team of scientists at the Council of Scientific and Industrial Research (CSIR) in New Delhi has recently applied for a patent for a catalyst that oxidizes propylene to PO in high yield. The primary motivation behind this project was the production of PO ...


High-Temperature Nuclear Power Cycle Using Either Helium Or S-Co2, Sally E. Mink, Stephanie E. Gedal, Dillon M. Weber, Abhinav Dantuluri 2016 University of Pennsylvania

High-Temperature Nuclear Power Cycle Using Either Helium Or S-Co2, Sally E. Mink, Stephanie E. Gedal, Dillon M. Weber, Abhinav Dantuluri

Senior Design Reports (CBE)

The goal of this process was to model the helium-based modular, nuclear reactor power cycle after the existing MIT Pebble-Bed Nuclear Reactor Power Cycle (Kadak, 2005), and to improve on the design by changing the working fluid to supercritical carbon dioxide (s-CO2). The power output of the process as specified in the problem statement, provided by Adam Brostow, was 120 MW. S-CO2 is a much denser fluid, and should theoretically require smaller equipment sizes, making it the more economically viable option for this process. However, it was found that with a return on investment (ROI) of -2.13 ...


Cocoa Liquor, Butter, & Powder Production, Mack Asselstine, Joseph M. Mollo, Jesus M. Morales, Vasiliki Papanikolopoulos 2016 University of Pennsylvania

Cocoa Liquor, Butter, & Powder Production, Mack Asselstine, Joseph M. Mollo, Jesus M. Morales, Vasiliki Papanikolopoulos

Senior Design Reports (CBE)

This project recommends a design for a cocoa processing plant to produce cocoa liquor, powder, and butter from fermented cocoa beans, in accordance with US Patent 6,066,350. The recommended design minimizes the use of external utilities by optimizing various heat integration strategies. The plant has a capacity of 120,000 tonnes/year and will be located in Tema, Ghana. The proposed design yields 25,000 tonnes/year of alkalized cocoa liquor with 54% fat, 52,000 tonnes/year of cocoa butter, 36,000 tonnes/year of 3% fat alkalized cocoa powder, and 9,000 tonnes/year of below ...


High-Purity Oxygen Production Using Mixed Ionic-Electronic Conducting Sorbents, Chandler C. Dorris, Eric Lu, Sangjae Park, Fabian H. Toro 2016 University of Pennsylvania

High-Purity Oxygen Production Using Mixed Ionic-Electronic Conducting Sorbents, Chandler C. Dorris, Eric Lu, Sangjae Park, Fabian H. Toro

Senior Design Reports (CBE)

This project evaluates the potential of new, mixed ionic-electronic conducting (MIEC) materials in the production of high-purity oxygen. Analyzing today’s proven MIEC properties, we design an optimized process for the production of oxygen at 30 metric tons/day. This report includes a detailed model of MIECs performance in a vacuum swing adsorption system. A sensitivity analysis is also included, which is used to optimize the operating conditions and other design variables. Based on an oxygen selling price of $40 per ton, the realized process would operate at a loss in today’s economy. The total capital investment of the ...


Large-Scale Fermentation Of E. Coli For The Production Of High-Purity Isoprene, Phillip A. Taylor, Yuta Inaba, Ian J. Pinto 2016 University of Pennsylvania

Large-Scale Fermentation Of E. Coli For The Production Of High-Purity Isoprene, Phillip A. Taylor, Yuta Inaba, Ian J. Pinto

Senior Design Reports (CBE)

We present a process for the production of isoprene via the fermentation of glucose. Based on our current specifications, we conclude that the use of recombinant E.coli for the fermentation of glucose is a novel yet unprofitable venture. Our current design entails the continuous production of isoprene using 3 pre-seed, 3 seed, and 5 production fermenters each with a production fermentation time of 72 hours. Our scheduling of the fermenters allowed us to produce isoprene continuously at a steady rate, and the liquid by-products of the fermentation were removed and sterilized at the end of each batch. Isoprene was ...


C4 Operations Optimization, Michael Moroney, Evan M. Smith, Marissa E. Thompson, Fernando Torres 2016 University of Pennsylvania

C4 Operations Optimization, Michael Moroney, Evan M. Smith, Marissa E. Thompson, Fernando Torres

Senior Design Reports (CBE)

The primary objective of the project chronicled in this report was to design a model that optimizes C4 operations. This model will optimize the options for processing both “crude C4” and “Cat BB” streams, taking the feed stream makeup, market pricings, and capacity constraints into account. Crude C4 streams contain butanes, butenes, and butadienes, while “Cat BB” streams are similar in makeup but do not include butadienes.

It is assumed that the equipment for all unit operations is readily available. In addition, the plant will already have a baseload of feedstock that does not fully utilize all the equipment in ...


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