Digital Commons Network^™

The Effect Of Visual Sensory Interference During Multitask Obstacle Crossing In Younger And Older Adults, Hyeyoung Cho, Shirley Rietdyk

Faculty Publications

When older adults step over obstacles during multitasking, their performance is impaired; the impairment results from central and/or sensory interference. The purpose was to determine if sensory interference alters performance under low levels of cognitive, temporal, and gait demand, and if the change in performance is different for younger versus older adults. Participants included 17 younger adults (20.9±1.9 years) and 14 older adults (69.7±5.4 years). The concurrent task was a single, simple reaction time (RT) task: depress button in response to light cue. The gait task was stepping over an obstacle (8 m walkway) in three conditions: (1) no sensory …

Improving 2–5 Qubit Quantum Phase Estimation Circuits Using Machine Learning, Charles Woodrum, Torrey J. Wagner, David E. Weeks

Faculty Publications

Quantum computing has the potential to solve problems that are currently intractable to classical computers with algorithms like Quantum Phase Estimation (QPE); however, noise significantly hinders the performance of today’s quantum computers. Machine learning has the potential to improve the performance of QPE algorithms, especially in the presence of noise. In this work, QPE circuits were simulated with varying levels of depolarizing noise to generate datasets of QPE output. In each case, the phase being estimated was generated with a phase gate, and each circuit modeled was defined by a randomly selected phase. The model accuracy, prediction speed, overfitting level …

Development Of An Experimentally Validated Computational Fluid Dynamics Model For A Pbi Membrane-Based Anhydrous Hcl Electrolyzer, Kris Likit-Anurak, Hunter R. Teel, Ishwor Karki, Ben I. Howard, Brian C. Benicewicz, Sirivatch Shimpalee, Benjamin H. Meekins

Faculty Publications

We report the development of an experimentally-validated computational fluid dynamics (CFD) model for simulation of an anhydrous HCl electrolyzer. The experimental data from 3 membrane variants was used to provide kinetic and membrane parameters for the model. The model not only accurately simulates overall electrolyzer performance, but it also provides key insights into the transport phenomena within the electrolyzer. The model allows simulation of experimental parameters like high HCl flowrates and increased cell pressure that pose a high safety risk to researchers. The model shows hotspots in the temperature distribution that will need to be addressed by flow field modification …

Engineering The Signal Resolution Of A Paper-Based Cell-Free Glutamine Biosensor With Genetic Engineering, Metabolic Engineering, And Process Optimization, Tyler J. Free, Joseph P. Talley, Chad D. Hyer, Catherine J. Millar, Joel S. Griffitts, Bradley Charles Bundy

Faculty Publications

Specialized cancer treatments have the potential to exploit glutamine dependence to increase patient survival rates. Glutamine diagnostics capable of tracking a patient’s response to treatment would enable a personalized treatment dosage to optimize the tradeoff between treatment success and dangerous side effects. Current clinical glutamine testing requires sophisticated and expensive lab-based tests, which are not broadly available on a frequent, individualized basis. To address the need for a low-cost, portable glutamine diagnostic, this work engineers a cell-free glutamine biosensor to overcome assay background and signal-to-noise limitations evident in previously reported studies. The findings from this work culminate in the development …

Effect Of Treated/Untreated Recycled Aggregate Concrete: Structural Behavior Of Rc Beams, Ayman Abdo, Ayman El-Zohairy, Yasser Alashker, Mohamed Abd El-Aziz Badran Mohamed

Faculty Publications

Using recycled concrete aggregates from construction and demolition wastes on structural concrete is a sustainable solution to reduce the consumption of natural resources and the detrimental effects of concrete production on the environment. This paper has collected much data from the literature to study fresh, mechanical properties and durability of concrete made of treated/untreated recycled aggregate (RA). Furthermore, the flexural and shear behavior of recycled aggregate concrete (RAC) beams was studied. This study discussed the distinctions and similarities between reinforced RAC beams and reinforced natural aggregate concrete (NAC) beams. The results of this review’s analysis clearly show that reinforced RAC …

Analysis Of Modeled 3d Solar Magnetic Field During 30 X/M-Class Solar Flares, Seth H. Garland, Vasyl B. Yurchyshyn, Robert D. Loper, Benjamin F. Akers, Daniel J. Emmons Ii

Faculty Publications

Using non-linear force free field (NLFFF) extrapolation, 3D magnetic fields were modeled from the 12-min cadence Solar Dynamics Observatory Helioseismic and Magnetic Imager (HMI) photospheric vector magnetograms, spanning a time period of 1 hour before through 1 hour after the start of 18 X-class and 12 M-class solar flares. Several magnetic field parameters were calculated from the modeled fields directly, as well as from the power spectrum of surface maps generated by summing the fields along the vertical axis, for two different regions: areas with photospheric |B_z|≥ 300 G (active region—AR) and areas above the photosphere with the …

Querida Promotora, Cristina Faiver-Serna

Faculty Publications

This open letter to the promotoras de salud (community health workers) of Long Beach, California explores the multifaceted demands placed on low-wage, highly skilled health educators within the nonprofit industrial complex, and exposes the geographies of Latinx health precarity from the perspective of urban health care feminized labor. The letter also shares and celebrates the deep commitment to justice that promotoras struggle toward through their care work.

Querida Promotora, Cristina Faiver-Serna

Faculty Publications

This open letter to the promotoras de salud (community health workers) of Long Beach, California explores the multifaceted demands placed on low-wage, highly skilled health educators within the nonprofit industrial complex, and exposes the geographies of Latinx health precarity from the perspective of urban health care feminized labor. The letter also shares and celebrates the deep commitment to justice that promotoras struggle toward through their care work.

Horizontal Subcontracting And The Global Factory, Peter J. Buckley, Michael Murphree, John Anderson

Faculty Publications

The focus of this article is the examination of the factors that trigger the addition of horizontal subcontracting to the structure of global factories. Horizontal subcontracting takes place when one firm is contracted to produce a given item, fills as much of the order as they are able to based on their available capacity, and subsequently subcontracts the remainder to a qualitatively identical firm. We find that similar entrepreneurial backgrounds of contract manufacturers lead to strong business ties in the same industry and stage of production; low-cost, used production machinery and inexpensive factory rent lead to low barriers to entry; …

College Students' Perceptions And Opinions Of Their Physical Activity Instructor Being Caring In Class, David C. Barney, Kamora Shelton, Katelyn Rogers, Teresa Leavitt Dr.

Faculty Publications

College can be a very impressionable time for a student, both positively and negatively. One way the college experience can be positive is the interactions the student has with their professors/instructors (hereafter the term instructor will be used). One behavior the instructors can exhibit including in physical activity (PA) classes is being caring or showing caring behaviors toward students. The purpose of this study was to investigate college students’ perceptions of the impact of PA instructor caring behaviors toward the student. For this study 69 college students (45 males and 24 females) were surveyed with one open-ended survey question. It …

Effects Of College Physical Activity Instructors' Enthusiasm On Student Experiences In Class, David C. Barney, Teresa Leavitt Dr.

Faculty Publications

It is hoped that teachers in all content areas will be excited, or enthusiastic for what they will be teaching their students. A teacher’s enthusiasm in class can be beneficial to students (Locke & Woods, 1982). Teacher enthusiasm also applies in college physical activity classes. This study investigated college physical activity instructor’s perception and opinions their enthusiasm and how it may affect the student’s experiences in class. For this study 10 college physical activity instructors were surveyed. Generally, the college physical activity felt that when they initiate conversations with students, listen to students, and are excited about what they are …

Techno-Economic Optimization Of A Hybrid Energy System With Limited Grid Connection In Pursuit Of Net Zero Carbon Emissions For New Zealand, Daniel Hill, Shafiqur Rahman Tito, Michael Walmsley, John Hedengren

Faculty Publications

As New Zealand moves towards net zero carbon emissions by 2050, multiple factors must be considered including increased electrical load due to electrification, variability of renewable energy generators, required storage capacity, system economics and limitations on grid transmission capacity. Complex and region-specific interactions between the various design choices involved are likely to require an understanding of a range of optimal and near-optimal designs for proposed micro-grid systems as opposed to a single optimal point. This work develops a novel multiscale optimization algorithm for optimization from a univariate capacity optimization approach to a multivariate one. This enhanced algorithm is applied to …

A Redox-Reversible A/B-Site Co-Doped Bafeo3 Electrode For Direct Hydrocarbon Solid Oxide Fuel Cells, Haixia Li, Wanhua Wang, Kai Zhao, Ka-Young Park, Taehee Lee, Ramin Babazadeh Dizaj, Andreas Heyden, Dong Ding, Fanglin Chen

Faculty Publications

Solid oxide fuel cells (SOFCs) can directly convert the chemical energy in fuel to electrical energy with fuel flexibility; however, the conventional nickel-based anodes face great challenges due to coking upon direct oxidation of hydrocarbon fuels and redox instability. Thus, developing new anode materials which can provide high coking resistance as well as redox stability is crucial. In this work, Ba_0.6La_0.4Fe_0.8Mo_0.1Ni_0.1O_3−δ (BLFMN) has been synthesized in air using a sol–gel combustion method, resulting in a dual phase consisting of a cubic BLFMN main phase and scheelite BaMoO_{4 …}

A Redox-Reversible A/B-Site Co-Doped Bafeo3 Electrode For Direct Hydrocarbon Solid Oxide Fuel Cells, Haixia Li, Wanhua Wang, Kai Zhao, Ka-Young Park, Taehee Lee, Ramin Babazadeh Dizaj, Andreas Heyden, Dong Ding, Fanglin Chen

Faculty Publications

Solid oxide fuel cells (SOFCs) can directly convert the chemical energy in fuel to electrical energy with fuel flexibility; however, the conventional nickel-based anodes face great challenges due to coking upon direct oxidation of hydrocarbon fuels and redox instability. Thus, developing new anode materials which can provide high coking resistance as well as redox stability is crucial. In this work, Ba_0.6La_0.4Fe_0.8Mo_0.1Ni_0.1O_3−δ (BLFMN) has been synthesized in air using a sol–gel combustion method, resulting in a dual phase consisting of a cubic BLFMN main phase and scheelite BaMoO_{4 …}

Quantification Of Surface Layer Turbulence Using Sensible Heat Values From Energy Balance Versus Aerodynamic Methods, Steven T. Fiorino, Yogendra Raut, Jaclyn Schmidt, Laura Slabaugh, Blaine Fourman, Jack E. Mccrae, Benjamin C. Wilson, Santasri R. Bose-Pillai

Faculty Publications

Surface layer optical turbulence values in the form of the refractive index structure function C_n^2 are often calculated from surface layer temperature, moisture, and wind characteristics and compared to measurements from sonic anemometers, differential temperature sensors, and imaging systems. A key derived component needed in the surface layer turbulence calculations is the sensible heat value. Typically, the sensible heat is calculated using the bulk aerodynamic method that assumes a certain surface roughness and a friction velocity that approximates the turbulence drag on temperature and moisture mixing from the change in the average surface layer vertical wind velocity. These assumptions/approximations generally …

Multiscale Modeling Of Oxygen Evolution Through Generated Bilayer Porous Transport Layers For Pemwe Performance Improvement, M. Sepe, G.-H. Jung, G.S- Doo, C.-S. Lee, H.-S. Cho, N. Tippayawong, Sirivatch Shimpalee

Faculty Publications

Optimization of proton exchange membrane water electrolyzers (PEMWE) has become a focus of researchers looking for a reliable way to generate power. A vital component to PEMWE operation is the porous transport layer (PTL) on the anode side, which is where oxygen is produced. The PTL must allow water access to the catalyst layer and remove oxygen simultaneously. In this work, a previously developed imaging technique is used to generate bilayer PTL structures. A multiscale modeling approach was used to study the effect of a bilayer PTL on oxygen evolution and PEMWE performance. First, a micro scale model was used …

Modes Of Weather System-Induced Flows Through An Arctic Lagoon, Chunyan Li, Wei Huang, Changsheng Chen, Kevin M. Boswell, Renhao Wu

Faculty Publications

With the increasing warming of the Arctic, the summertime ice-free period in the coastal Arctic becomes longer and the water exchange between arctic lagoons and coastal Beaufort Sea becomes more important for land–ocean interaction. This study examined the dynamics of water exchange between the arctic lagoons and the Arctic Ocean under the influence of weather systems (the transient arctic cyclones and hovering Beaufort High pressure system). We implemented rare observations, numerical modeling with the Finite Volume Community Ocean Model (FVCOM), and a forcing-response Empirical Orthogonal Function (fr-EOF) analysis to determine the weather-driven flow patterns and characteristics in the micro-tidal arctic …

Infrastructure Finance For The Public Good: How Asset Recycling Can Untangle The New York Mta's $50 Billion Debt Load, Lev E. Breydo

Faculty Publications

Systematic infrastructure underinvestment - a $2.6 trillion 'gap' - and accelerating climate change have become facts of life in the United States. Though typically attributed to politics, this Article posits the circumstances as a market disequilibrium rooted in an interplay between unique dimensions of infrastructure and distinctive features of the U.S. approach. Recently-passed legislation, including the Infrastructure Investment and Jobs Act, is insufficient to overcome these longstanding challenges.

Based on a broad, global study of effective approaches to infrastructure finance, as well as a multi-disciplinary analysis of the economics, engineering and finance literature, this Article proposes addressing the U.S. infrastructure …

Using Tensile And Compressive Stress Superposition During Incremental Forming To Manipulate Martensitic Transformation In Ss304, E M. Mamros, F Maab, A E. Tekkaya, Brad L. Kinsey, J Ha

Faculty Publications

Single point incremental forming (SPIF) is a flexible manufacturing process that has applications in industries ranging from biomedical to automotive. In addition to rapid prototyping, which requires easy adaptations in geometry or material for design changes, control of the final part properties is desired. One strategy that can be implemented is stress superposition, which is the application of additional stresses during an existing manufacturing process. Tensile and compressive stresses applied during SPIF showed significant effects on the resulting microstructure in stainless steel 304 truncated square pyramids. Specifically, the amount of martensitic transformation was increased through stress superposed incremental forming. Finite …

Detection Of Ochyromera Ligustri (Coleoptera: Curculionidae: Curculioninae) In Ligustrum Spp. (Oleaceae) Using Newly Developed Pcr Primers, Ilgoo Kang, Amy Roda, Brandi Misiaszek, Tanner Sparks, Rodrigo Diaz

Faculty Publications

Ligustrum spp. (Oleaceae) have become invasive species in the US and negatively affect native plant diversity and richness in forests. Ochyromera ligustri (Coleoptera: Curculionidae) is considered a potential biological control agent in the US because adults feed on the foliage and larvae are seed-feeders of Ligustrum spp. To discover the relationships between O. ligustri and Ligustrum spp., fruit dissections or rearing and field observations are required. In the current research project, novel PCR primers were developed to rapidly detect the DNA of O. ligustri in molecular analyses without rearing and observation. The developed PCR primers worked even with 0.01 ng …

Relative Impacts Of Varroa Destructor (Mesostigmata:Varroidae) Infestation And Pesticide Exposure On Honey Bee Colony Health And Survival In A High-Intensity Corn And Soybean Producing Region In Northern Iowa, Frank D. Rinkevich, Robert G. Danka, Thomas E. Rinderer, Joseph W. Margotta, Lewis J. Bartlett, Kristen B. Healy

Faculty Publications

The negative effects of Varroa and pesticides on colony health and survival are among the most important concerns to beekeepers. To compare the relative contribution of Varroa, pesticides, and interactions between them on honey bee colony performance and survival, a 2-year longitudinal study was performed in corn and soybean growing areas of Iowa. Varroa infestation and pesticide content in stored pollen were measured from 3 apiaries across a gradient of corn and soybean production areas and compared to measurements of colony health and survival. Colonies were not treated for Varroa the first year, but were treated the second year, leading …

Breaking The Spatial Justice Emergency Cycle: The Role Of Foresight Planning, Fabio Capra-Ribeiro

Faculty Publications

This paper examines the critical need to integrate prospective planning into territorial development processes for achieving spatial justice and sustainable urban futures. It highlights the limitations of a reactive approach to urban governance, particularly prevalent in Latin America, where weak institutions and unstable political systems often hinder long-term perspectives. The research emphasizes the importance of strategic foresight as a complementary tool to traditional planning practices. Territorial foresight facilitates the exploration of complex future scenarios, fostering collaborative learning and a shared vision among stakeholders. The study proposes a shift towards a proactive, foresight-driven approach that can help break the vicious cycle …

Mapping And Omics Integration: Towards Precise Rice Disease Resistance Breeding, John Christian Ontoy, Jong Hyun Ham

Faculty Publications

Rice (Oryza sativa), as a staple crop feeding a significant portion of the global population, particularly in Asian countries, faces constant threats from various diseases jeopardizing global food security. A precise understanding of disease resistance mechanisms is crucial for developing resilient rice varieties. Traditional genetic mapping methods, such as QTL mapping, provide valuable insights into the genetic basis of diseases. However, the complex nature of rice diseases demands a holistic approach to gain an accurate knowledge of it. Omics technologies, including genomics, transcriptomics, proteomics, and metabolomics, enable a comprehensive analysis of biological molecules, uncovering intricate molecular interactions within the rice …

Speech, Voice, And Language Outcomes Following Deep Brain Stimulation: A Systematic Review, Fatemeh Tabari, Joel I. Berger, Oliver Flouty, Brian Copeland, Jeremy D. Greenlee, Karim Johari

Faculty Publications

Background Deep brain stimulation (DBS) reliably ameliorates cardinal motor symptoms in Parkinson’s disease (PD) and essential tremor (ET). However, the effects of DBS on speech, voice and language have been inconsistent and have not been examined comprehensively in a single study. Objective We conducted a systematic analysis of literature by reviewing studies that examined the effects of DBS on speech, voice and language in PD and ET. Methods A total of 675 publications were retrieved from PubMed, Embase, CINHAL, Web of Science, Cochrane Library and Scopus databases. Based on our selection criteria, 90 papers were included in our analysis. The …

Clear Speech Effects In Production Of Sentence-Medial Mandarin Lexical Tonesa), Jack Rittenberry, Irina A. Shport

Faculty Publications

Adding to limited research on clear speech in tone languages, productions of Mandarin lexical tones were examined in pentasyllabic sentences. Fourteen participants read sentences imagining a hard-of-hearing addressee or a friend in a casual social setting. Tones produced in clear speech had longer duration, higher intensity, and larger F0 values. This style effect was rarely modulated by tone, preceding tonal context, or syllable position, consistent with an overall signal enhancement strategy. Possible evidence for tone enhancement was observed only in one set of analysis for F0 minimum and F0 range, contrasting tones with low targets and tones with high targets.

Exploring Pathways Toward Open-Hardware Ecosystems To Safeguard Genetic Resources For Biomedical Research Communities Using Aquatic Model Species, Yue Liu, Jack C. Koch, Lucía Arregui, Allyssa Oune, Sarah Bodenstein, Maria T. Gutierrez-Wing, Terrence R. Tiersch

Faculty Publications

Development of reliable germplasm repositories is critical for preservation of genetic resources of aquatic species, which are widely utilized to support biomedical innovation by providing a foundational source for naturally occurring variation and development of new variants through genetic manipulations. A significant barrier in repository development is the lack of cryopreservation capability and reproducibility across the research community, posing great risks of losing advances developed from billions of dollars of research investment. The emergence of open scientific hardware has fueled a new movement across biomedical research communities. With the increasing accessibility of consumer-level fabrication technologies, such as three-dimensional printers, open …

Sexual Orientation-Based Microaggressions And Cannabis Use Outcomes Among Sexual Minority Individuals: The Impact Of Negative Affect And Coping-Motivated Cannabis Use, Evan M. Threeton, Paige E. Morris, Julia D. Buckner

Faculty Publications

Introduction: Sexual minority individuals report significantly more cannabis use and problems than their heterosexual peers, possibly due to their frequent experiences with sexual orientation-based microaggressions. As a result, sexual minority individuals may turn to cannabis use to cope with the negative affect associated with these experiences. No known studies have tested this hypothesis; therefore, the current study tested if sexual orientation microaggressions are positively associated with negative affect (anxiety and depression), cannabis coping motives, and cannabis-related outcomes (frequency, problems); if coping motives are positively associated with cannabis-related outcomes; and if negative affect and cannabis use to cope with negative affect …

Differential Risk: Gender And Racial Differences In The Relationship Between Trauma, Discrimination, And Schizotypy, Mahogany A. Monette, Madisen T. Russell, Danielle B. Abel, Jarrett T. Lewis, Jessica L. Mickens, Evan J. Myers, Megan M. Hricovec, David C. Cicero, J. Wolny, William P. Hetrick, Michael D. Masucci, Alex S. Cohen, Christopher J. Burgin, Thomas R. Kwapil, Kyle S. Minor

Faculty Publications

Traumatic experiences are associated with increased experiences of positive schizotypy. This may be especially important for People of Color, who experience higher rates of trauma and racial discrimination. No study to date has examined how racial disparities in traumatic experiences may impact schizotypy. Furthermore, of the studies that have examined the relationship between trauma and schizotypy, none have examined racial discrimination as a potential moderator. The present study examined if racial discrimination moderates the relationship between trauma and multidimensional (positive, negative, and disorganized) schizotypy. In a sample of 770 college students, we conducted chi-squared analyses, analyses of variance, and stepwise …

Transitioning From A Research Protocol To A Scalable Applied Pathway For Xenopus Laevis Sperm Cryopreservation At A National Stock Center: The Effect Of Cryoprotectants, Lucía Arregui, Jack C. Koch, Terrence R. Tiersch

Faculty Publications

Sperm cryopreservation is a critical tool for safeguarding and managing valuable genetic resources. Protocols for cryopreservation of Xenopus laevis sperm were available but lacking sperm quality evaluation and scalability and the outcomes were inconsistent. The goal of this study was to begin developing a center-level cryopreservation pathway for this species by integrating French straws as containers that would facilitate germplasm repository development. The objectives were to analyze the effect of: (1) three sperm concentrations (33, 50, and 100 × 106 sperm/mL) on post-thaw fertilization, (2) three final concentrations (2.5%, 5%, and 10%) of dimethyl sulfoxide, methanol, and dimethylformamide (DMFA) on …

Energy Compensation For Crop Growth Under Plastic Mulching: Theories, Models, And Limitations, Dianyuan Ding, Ting Li, Lihong Wu, Xi Zhang, Ying Zhao, Hao Feng, Chao Zhang, Ole Wendroth

Faculty Publications

Plastic film mulching (PM) is a useful agronomic means to adapt to the environmental conditions of dryland agriculture and improve crop production. To improve the theoretical framework of PM technology, this study focuses on the interaction between the soil temperature change caused by PM and crop growth. The definition, action mechanism, and simulation of the compensatory effect of PM on growing degree days are introduced to reveal the effect of soil temperature under PM on crop development and growth. Our summary shows that the strength of the warming effect changes with the growth and development of crops, strengthening during the …