Strong Stability Of A Class Of Difference Equations Of Continuous Time And Structured Singular Value Problem, 2018 Nanjing University of Science and Technology
Strong Stability Of A Class Of Difference Equations Of Continuous Time And Structured Singular Value Problem, Qian Ma, Keqin Gu, Narges Choubedar
SIUE Faculty Research, Scholarship, and Creative Activity
This article studies the strong stability of scalar difference equations of continuous time in which the delays are sums of a number of independent parameters tau_i, i = 1, 2, . . . ,K. The characteristic quasipolynomial of such an equation is a multilinear function of exp(-tau_i s). It is known that the characteristic quasipolynomial of any difference equation set in the form of one-delayper- scalar-channel (ODPSC) model is also in such a multilinear form. However, it is shown in this article that some multilinear forms of quasipolynomials are not characteristic quasipolynomials of any ODPSC difference equation set. The equivalence between local strong ...
Pollution Prevention In The Great Lakes Basin: Working With Pulp & Paper Manufacturers, 2017 NY State Pollution Prevention Institute, Rochester Institute of Technology
Pollution Prevention In The Great Lakes Basin: Working With Pulp & Paper Manufacturers, Eugene Park
Journal of Environmental Sustainability
In response to growing concerns over persistent toxic substances in the Great Lakes, new initiatives are in place to address and mitigate pollutant loadings to these large natural waterbodies. With support from the U.S. Environmental Protection Agency and New York Department of Environmental Conservation, the New York State Pollution Prevention Institute (NYSP2I) worked with pulp & paper companies in the Great Lakes Basin in an effort to find solutions to reduce environmental impacts from this industry sector. Based on currently available EPA toolkits, NYSP2I developed and utilized an assessment tool called Lean, Energy, and Environment (LE2). Five different paper manufacturers ...
Investigation Of Bacteria Transport And Resistance Mechanisms And Implications For Water Quality From Confinement Swine And Beef Grazing Production Systems In Iowa, Michelle Soupir, Matt Helmers, Michael L. Thompson, Laura R. Jarboe, Antonio P. Mallarino, Ramesh S. Kanwar
Matthew J. Helmers
This multi-scale, multi-year study was conducted to begin answering questions related to the fate and transport of nutrients and bacteria from land receiving manure application. Experiments were conducted on tile water drainage at an ISU Research Farm in northeast Iowa.
What Happens To Nox Emissions Of Vw Diesel Cars When Water/Methanol Injection Is Used?, 2017 Southern Illinois University Carbondale
What Happens To Nox Emissions Of Vw Diesel Cars When Water/Methanol Injection Is Used?, Andrew Croxell
ASA Multidisciplinary Research Symposium
Volkswagen has come under fire for their "Clean Diesel" automobiles that were found to emit too much NOx (Oxides of Nitrogen) when driven on the street. Since NOx is created by high temperature combustion events, the addition of a water/methanol injection system was tested on a VW diesel vehicle to identify if it could cool combustion temperatures and thus reduce NOx to an acceptable specification.
Gender And Participation In An Engineering Problem-Based Learning Environment, 2017 University of Michigan
Gender And Participation In An Engineering Problem-Based Learning Environment, Laura Hirshfield, Milo D. Koretsky
Interdisciplinary Journal of Problem-Based Learning
The use of problem-based learning (PBL) is gaining attention in the engineering classroom as a way to help students synthesize foundational knowledge and to better prepare students for practice. In this work, we study the discourse interactions between 27 student teams and two instructors in an engineering PBL environment to analyze how participation is distributed among team members, paying particular attention to the differences between male and female students. There were no statistically significant differences between the amount that male and female students spoke; however, stereotypical gender roles and traditional gendered behavior did manifest in the discussion. Also, regardless of ...
Development Of Novel N-Isopropylacrylamide (Nipaam) Based Hydrogels With Varying Content Of Chrysin Multiacrylate, 2017 University of Kentucky
Development Of Novel N-Isopropylacrylamide (Nipaam) Based Hydrogels With Varying Content Of Chrysin Multiacrylate, Shuo Tang, Martha Floy, Rohit Bhandari, Thomas D. Dziubla, J. Zach Hilt
Chemical and Materials Engineering Faculty Publications
A series of novel temperature responsive hydrogels were synthesized by free radical polymerization with varying content of chrysin multiacrylate (ChryMA). The goal was to study the impact of this novel polyphenolic-based multiacrylate on the properties of N-isopropylacrylamide (NIPAAm) hydrogels. The temperature responsive behavior of the copolymerized gels was characterized by swelling studies, and their lower critical solution temperature (LCST) was characterized through differential scanning calorimetry (DSC). It was shown that the incorporation of ChryMA decreased the swelling ratios of the hydrogels and shifted their LCSTs to a lower temperature. Gels with different ChryMA content showed different levels of response to ...
Constructing Slow Sand Filters: Engineering Students’ Experiences In San José De Playón, Bolívar, Colombia, Sol Park, Sanyukta Gokhale, Kaylyn Colinco
Purdue Journal of Service-Learning and International Engagement
Sol Park, Sanyukta Gokhale, and Kaylyn Colinco were members of a Global Design Team (GDT) involved in providing innovative solutions to drinking water treatment in rural areas of developing countries. The immediate goal of the GDT in May 2016 was to deliver large slow sand filters (SSFs) to a rural school in Colombia. The experience placed the students in a small town 80 km (~50 miles) south of Cartagena, Colombia, called San José de Playón. The town pumps water from the Arroyo Reservoir, which is then consumed by the citizens and students at the local school (the only one in ...
The Solvent- Solid Interface Of Acid Catalysts Studied By High Resolution Mas Nmr, 2017 Iowa State University
The Solvent- Solid Interface Of Acid Catalysts Studied By High Resolution Mas Nmr, Robert L. Johnson, Michael P. Hanrahan, Max Mellmer, James A. Dumesic, Aaron J. Rossini, Brent H. Shanks
Brent H Shanks
High-resolution magic angle spinning (HRMAS) NMR spectroscopy was used to study the eﬀect of mixed solvent systems on the acidity at the solid−liquid interface of solid acid catalysts. A method was developed that can exploit beneﬁts of both solution and solid-state NMR (SSNMR) by wetting porous solids with small volumes of liquids (<2 >μL/mg) to create an interfacial liquid that exhibits unique motional dynamics intermediate to an isotropic liquid and a rigid solid. Results from these experiments provide information about the inﬂuence of the solvent mixtures on the acidic properties at a solid−liquid interface. Importantly, use of MAS ...2>
Electrochemical Conversion Of Biologically Produced Muconic Acid: Key Considerations For Scale-Up And Corresponding Technoeconomic Analysis, John E. Matthiesen, Miguel SuáStegui, Yutong Wu, Mothi Viswanathan, Yang Qu, Mingfeng Cao, Natalia Rodriguez-Quiroz, Adam Okerlund, George Kraus, D. Raj Raman, Zengyi Shao, Jean-Philippe Tessonnier
Muconic acid, an unsaturated diacid that can be produced from cellulosic sugars and lignin monomers by fermentation, emerges as a promising intermediate for the sustainable manufacture of commodity polyamides and polyesters including Nylon-6,6 and polyethylene terephthalate (PET). Current conversion schemes consist in the biological production of cis,cis-muconic acid using metabolically engineered yeasts and bacteria, and the subsequent diversiﬁcation to adipic acid, terephthalic acid, and their derivatives using chemical catalysts. In some instances, conventional precious metal catalysts can be advantageously replaced by base metal electrocatalysts. Here, we show the economic relevance of utilizing a hybrid biological−electrochemical conversion scheme ...
Mixed Municipal Solid Waste Hygienisation For Refuse-Derived Fuel Production By Ozonation In The Novel Configuration Using Fluidized Bed And Horizontal Reactor, Witold Zukowski
Electrochemical Reduction Of Co2 Using Metal Nanoparticles, 2017 Louisiana State University at Baton Rouge
Electrochemical Reduction Of Co2 Using Metal Nanoparticles, Evan Michael Andrews
LSU Doctoral Dissertations
The electrochemical reduction of CO2 has been proposed as a method of storing electrical energy from renewable sources in the form of hydrocarbon fuels. By reverting CO2 into high energy density fuels, a CO2-neutral fuel cycle becomes possible while still hydrocarbon fueled engines. Cu and Au metals have been found to be particularly effective at catalyzing this reaction, yielding a majority of hydrocarbons and CO respectively. However, the CO2 electroreduction reaction is still poorly understood and catalysts that possess both high energy efficiency and high yield are not yet developed. Nanoscale catalysts offer the ability ...
Nanocomposites For Visible Light-Induced Photocatalysis, 2017 Universiti Brunei Darussalaam
Nanocomposites For Visible Light-Induced Photocatalysis, Mohammad Mansoob Khan Dr, Debabrata Pradhan, Youngku Sohn
Dr. Mohammad Mansoob Khan
Smooth Muscle Stiffness Sensitivity Is Driven By Soluble And Insoluble Ecm Chemistry, 2017 University of Massachusetts - Amherst
Smooth Muscle Stiffness Sensitivity Is Driven By Soluble And Insoluble Ecm Chemistry, William G. Herrick, Shruti Rattan, Thuy V. Nguyen, Michael S. Grunwald, Christopher W. Barney, Alfred J. Crosby, Shelly Peyton
Smooth muscle cell (SMC) invasion into plaques and subsequent proliferation is a major factor in the progression of atherosclerosis. During disease progression, SMCs experience major changes in their microenvironment, such as what integrin-binding sites are exposed, the portfolio of soluble factors available, and the elasticity and modulus of the surrounding vessel wall. We have developed a hydrogel biomaterial platform to examine the combined effect of these changes on SMC phenotype. We were particularly interested in how the chemical microenvironment affected the ability of SMCs to sense and respond to modulus. To our surprise, we observed that integrin binding and soluble ...
Peg-Phosphorylcholine Hydrogels As Tunable And Versatile Platforms For Mechanobiology, 2017 University of Massachusetts - Amherst
Peg-Phosphorylcholine Hydrogels As Tunable And Versatile Platforms For Mechanobiology, William G. Herrick, Thuy V. Nguyen, Marianne Sleiman, Samantha Mcrae, Todd Emrick, Shelly Peyton
We report here the synthesis of a new class of hydrogels with an extremely wide range of mechanical properties suitable for cell studies. Mechanobiology has emerged as an important field in bioengineering, in part due to the development of synthetic polymer gels and fibrous protein biomaterials to control and quantify how cells sense and respond to mechanical forces in their microenvironment. To address the problem of limited availability of biomaterials, in terms of both mechanical range and optical clarity, we have prepared hydrogels that combine poly(ethylene glycol) (PEG) and phosphorylcholine (PC) zwitterions. Our goal was to create a hydrogel ...
The Predictive Link Between Matrix And Metastasis, 2017 University of Massachusetts Amherst
The Predictive Link Between Matrix And Metastasis, Lauren E. Barney, Lauren Jansen, S. R. Polio, Sualyneth Galarza, Maureen E. Lynch, Shelly Peyton
Cancer spread (metastasis) is responsible for 90% of cancer-related fatalities. Informing patient treatment to prevent metastasis, or kill all cancer cells in a patient's body before it becomes metastatic is extremely powerful. However, aggressive treatment for all non-metastatic patients is detrimental, both for quality of life concerns, and the risk of kidney or liver-related toxicity. Knowing when and where a patient has metastatic risk could revolutionize patient treatment and care. In this review, we attempt to summarize the key work of engineers and quantitative biologists in developing strategies and model systems to predict metastasis, with a particular focus on ...
Mechanics Of Intact Bone Marrow, 2017 University of Massachusetts Amherst
Mechanics Of Intact Bone Marrow, Lauren Jansen, Nathan P. Birch, Jessica D. Schiffman, Alfred J. Crosby, Shelly Peyton
The current knowledge of bone marrow mechanics is limited to its viscous properties, neglecting the elastic contribution of the extracellular matrix. To get a more complete view of the mechanics of marrow, we characterized intact yellow porcine bone marrow using three different, but complementary techniques: rheology, indentation, and cavitation. Our analysis shows that bone marrow is elastic, and has a large amount of intra- and inter-sample heterogeneity, with an effective Young’s modulus ranging from 0.25-24.7 kPa at physiological temperature. Each testing method was consistent across matched tissue samples, and each provided unique benefits depending on user needs ...
A Student-Created, Open Access, Living Textbook, 2017 University of Massachusetts Amherst
A Student-Created, Open Access, Living Textbook, Sualyneth Galarza, Sarah L. Perry, Shelly Peyton
Textbooks are expensive, updated infrequently, and rarely used effectively by students. We discuss here a way for students to create the textbook for the course, helping them feel ownership over the course material. This Wiki-based, student-created textbook is online free for use, widely accessible by all, and editable during the course of and as topics evolve. This type of textbook format is particularly well suited to upper-level electives on topics that are rapidly emerging. We have nucleated a student created textbook here, fully online and open access, for two upper elective courses in chemical engineering. Wikis offer an easy-to-learn platform ...
Development Of Starch-Polyvinyl Alcohol (Pva) Biodegradable Film: Effect Of Cross-Linking Agent And Antimicrobials On Film Characteristics, 2017 Agricultural and Food Engineering Department, Indian Institute of Technology, Kharagpur
Development Of Starch-Polyvinyl Alcohol (Pva) Biodegradable Film: Effect Of Cross-Linking Agent And Antimicrobials On Film Characteristics, Aniket Satish More, Chandani Sen, Madhusweta Das
Journal of Applied Packaging Research
To satisfy the need of developing eco-friendly flexible antimicrobial packaging film with minimum use of synthetic chemical ingredients, the present study examined the efficacy of citric acid (CA) as cross-linking agent and essential oils (EOs), viz., cinnamon essential oil (CEO) and oregano essential oil (OEO) as natural antimicrobials in corn starch-polyvinyl alcohol (CS-PVA) film. Compared to film prepared from filmogenic solution (FS) containing 75 kg CS+8.75 kg PVA+24.6 kg glycerol per m3 FS, film additionally containing CA at 0.07 kg/kg CS indicated 95% higher ultimate tensile strength (UTS) and 27% lower water vapor ...
Ion Trap Mass Analyzer Apparatus, Methods, And Systems Utilizing One Or More Multiple Potential Ion Guide (Mpig) Electrodes, Curtiss Hanson
Curtiss D. Hanson
In one aspect of the invention, an ion trap mass analyzer includes a variable- or multi-potential type ion guide (MPIG) assembly which has been pre-configured to produce a parabolic-type potential field. Each MPIG electrode has a resistive coating of designed characteristics. In one example the coating varies in thickness long the length of an underlying uniform substrate. The MPIG assembly can be a single MPIG electrode or an array of a plurality of MPIG electrodes. An array can facilitate delocalization for improved performance. This chemical modification of a uniform underlying substrate promotes cheaper and flexible instruments. The modified MPIG electrodes ...
Combined Model Predictive Control And Scheduling With Dominant Time Constant Compensation, 2017 Brigham Young University
Combined Model Predictive Control And Scheduling With Dominant Time Constant Compensation, Logan Beal, Junho Park, Damon Petersen, Sean C. Warnick, John Hedengren
All Faculty Publications
Linear model predictive control is extended to both control and optimize a product grade schedule. The proposed methods are time-scaling of the linear dynamics based on throughput rates and grade-based objectives for product scheduling based on a mathematical program with complementarity constraints. The linear model is adjusted with a residence time approximation to time-scale the dynamics based on throughput. Although nonlinear models directly account for changing dynamics, the model form is restricted to linear differential equations to enable fast online cycle times for large-scale and real-time systems. This method of extending a linear time-invariant model for scheduling is designed for ...