Digital Commons Network^™

A General Effectiveness-Ntu Modeling Framework For Membrane Dehumidification Systems, Andrew J. Fix, James E. Braun, David M. Warsinger

School of Mechanical Engineering Faculty Publications

Selective membrane dehumidification is a promising technology for energy efficient air dehumidification in buildings and has been ranked as a top alternative technology by the Department of Energy. One critical area that needs to be addressed is system modeling that incorporates device mass transfer characteristics and sizing. This work develops, validates, and applies a simple effectiveness-number of transfer units (𝜀−𝑁TU) modeling framework for dehumidification technologies that can be used to predict performance and determine required membrane area for a wide range of technologies, including energy recovery ventilators, vacuum membrane dehumidification, and desiccant dehumidifiers. Although the 𝜀−𝑁TU method is a well-established …

Quantitative Methods For Analyzing Second Language Lexical Tone Production, Alexis Zhou, Daniel J. Olson

School of Languages and Cultures Faculty Publications

The production of L2 lexical tone has proven difficult for learners of tonal languages, leading to the testing of different tone training techniques. To test the validity of these techniques, it is first necessary to capture the differences between L1 and L2 tone datasets. The current study explores three analyses designed to compare L1 and L2 tone: (1) using a single deviation score, (2) using deviation score calculations for specific regions of tone productions, and (3) applying a complexity-invariant distance measure to the two time series datasets. These three analyses were tested using datasets sampled from a previous study testing …

Changes In Highway Expenditures And Revenues In An Era Of Cavs, Volume A: Road Agencies, Isaiah C. Mwamba, Bortiorkor N.T. Alabi, Deepak Benny, Abdullah J. Nafakh, Samuel Labi, Kumares C. Sinha

Center for Connected and Automated Transportation

No abstract provided.

Design And Management Of Highway Infrastructure To Accommodate Cavs, Samuel Labi, Tariq U. Saeed, Mohammadhosein Pourgholamali, Zainab Abidemi Saka, Kumares Sinha

Center for Connected and Automated Transportation

Over the past century, landmark advancements in vehicle technology have motivated road agencies to carry out changes in their road infrastructure design and management processes to accommodate these advancements. The advent of Autonomous Vehicles (AVs), however, poses infrastructure challenges that could be more profound compared to those faced in the past. This study first discusses AV issues and concepts that could influence the scope and types of roadway infrastructure design and management in the AV era. These issues include AV technology readiness, the levels of vehicle autonomy, the stages of AV operations, and stakeholder roles. The study discusses AV demand …

Improving Primary Care Provider Prediabetes Patient Education Through Use Of An Education Tool, Larry Mcconnell Ii, Elizabeth Richards, Julian Gallegos, Marcella Tashijian-Gibbs

School of Nursing Faculty Publications

Current research findings suggest that improving provider education and utilizing communication guidelines can positively impact patient outcomes. This study used a series of three surveys and a focus group to examine if primary care provider’s knowledge, confidence, and practice regarding prediabetes patient education can be improved by utilizing the Ready and Able prediabetes lifestyle modification education tool. Study results found that the Ready and Able conversation guide was well received, had a positive impact on providers knowledge and confidence, and addressed barriers to delivering patient education.

Mirnome Expression Analysis In Canine Diffuse Large B-Cell Lymphoma, Nelly O. Elshafie, Naila C. Do Nascimento, Nathanel I. Lichti, Andrea L. Kasinski, Michael O. Childress, Andrea P. Dos Santos

Purdue University Libraries Open Access Publishing Fund

Lymphoma is among the most common cancer in dogs. Diffuse large B-cell lymphoma (DLBCL) is the predominant type, accounting for up to half of all cases. Definitive diagnosis of DLBCL relies on cytologic evaluation with immunophenotyping, or histopathology and immunohistochemistry when needed. A rapid and specific molecular test aiding in the diagnosis could be beneficial. Noncoding microRNAs (miRNAs) are regulators of gene expression involved in a variety of cellular processes, including cell differentiation, cell cycle progression, and apoptosis. Not surprisingly, miRNA expression is aberrant in diseases such as cancers. Their high stability and abundance in tissues make them promising biomarkers …

Impact Of Covid-19 On Service Dog Organizations, Danny Benbassat, Abigail Konopasky, Michael Fox

People and Animals: The International Journal of Research and Practice

The 2019 coronavirus pandemic led to federal, state, and local measures that paralyzed businesses across the nation. Among them were behavioral and mental health nonprofit organizations. The purpose of this study was to understand the impact of the pandemic on nonprofit programs that train and place service dogs with veterans/service members. Six service dog managers completed eight reflection probe questionnaires and participated in three focus groups. This study found that facility shutdown, businesses shutdown, and social distancing resulted in a training bottleneck for both canines and humans. These primary challenges created secondary and tertiary challenges that mirror and lend support …

On The Design And Power Output Response Of Hydraulic Wind Turbines, Helber Antonio Esquivel-Puentes, Andrea Vacca, Venkatesh Pulletikurthi, Ali Doosttalab, Jose Garcia-Bravo, David M. Warsinger, Leonardo P. Chamorro, Luciano Castillo

School of Mechanical Engineering Faculty Publications

Standard horizontal axis wind turbines typically use gearboxes for large-scale applications and direct coupling for small-scale designs to connect the rotor to the generator. However, gearboxes pose challenges due to their weight, cost, and exposure to dynamic loads and vibrations within the nacelle. A promising alternative is replacing mechanical transmission with a hydrostatic counterpart, offering advantages such as reduced nacelle mass, generator placement at the tower base, and elimination of the gearbox. It can potentially lead to cost savings of up to 20% in the levelized cost of electricity for offshore wind turbines. This study compares regulated hydrostatic transmission with …

“I’M Here, I Can Help”: Supporting Southeast Asian American Community College Students, Johanna M. Tigert, Phitsamay S. Uy, Argyro A. Armstrong, Francine Coston, Elias Nader

Journal of Southeast Asian American Education and Advancement

This study examined the experiences of Asian American students with one community college’s student services: Writing Center, Financial Aid Center, and Asian American Student Center (AASC). Data included survey responses, focus group interviews, and individual student interviews. Chi square tests were conducted to see if there were significant differences in participants’ responses based on ethnicity (Cambodian/Khmer vs. other), gender, and age (traditionally vs. non-traditionally aged). Focus group and individual interview data were analyzed thematically. Results showed that about half of the students had accessed the Writing Center and the AASC, while over 85% accessed the Financial Aid Center. There were …

Course Experiences That Promote And Inhibit Human-Centered Design, Elizabeth A. Sanders, Molly Goldstein, Justin L. Hess

School of Engineering Education Faculty Publications

Engineers contribute to large-scale socio-technical challenges, and human-centered design offers a design thinking approach that helps engineers develop a thorough understanding of the socio-technical effects of their design work. Thus, effective strategies for assessing and teaching human-centered design are needed. This study aimed to identify course characteristics that influence how students experience human-centered design in an introductory systems engineering design course. First, we categorized open-ended written reflections to understand the degree to which students experienced human-centered design. Second, we performed a thematic analysis to characterize salient course experiences for two groups of students: (1) students who experienced human-centered design in …

270 Nm Ultra-Thin Self-Adhesive Conformable And Long-Term Air-Stable Complimentary Organic Transistors And Amplifiers, Mohammad Javad Mirshojaeian Hosseini, Yi Yang, Walter Kruger, Tomoyuki Yokota, Sunghoon Lee, Takao Someyra, Robert Nawrocki

Purdue University Libraries Open Access Publishing Fund

Lightweight, flexible, and conformal bioelectronics are essential for wearable technologies. This paper introduces 270 nm thin organic electronics amplifying circuits that are self-adhesive, skin conformal, and long-term air-stable. This report studies the effect of total device thickness, namely 3 μm and 270 nm devices, on the characterization of organic devices before and after buckling, the longevity of organic field-effect transistors (OFETs) over 5 years, and the lamination of OFETs on the human skin. A single-stage organic complementary inverter and a pseudo-complementary amplifier are fabricated to compare their electrical characteristics, with amplification gains of 10 and 64, respectively. Finally, the study …

Phd Supervisors Bad Rap Of Open Access Journals, Lindall Adams

Proceedings of the IATUL Conferences

A decade or more preceded the formal coinage of the term "open access," but the practice of making journal papers freely available online is a relatively new development. Among the first public statements to use the term "open access," the Budapest Open Access Initiative, Bethesda Statement on Open Access Publishing, and Berlin Declaration on Open Access to Knowledge in the Sciences and Humanities were released in February 2002, and their initial concept of open access refers to unrestricted online access to scholarly research, primarily journal articles. Over the past few years, the number of journals available through open access has …

From Scratch To Launch; Leveraging University Of Miami Libraries’ Research Information Management System To Cultivate University-Wide Partnerships And Support Faculty Research Dissemination And Impact, Kineret Ben Knaan, Elizabeth Gushee, Angela Clark

Proceedings of the IATUL Conferences

Since 2017, the University of Miami Libraries (UML) has engaged with key stakeholders and institutional leaders to adapt and build a centralized, sustainable Research Information Management System (RIMS) helping to curate, manage, and promote institutional research output. This paper details the development and rollout of Esploro by Ex Libris (locally branded Scholarship@Miami), the Institutional Repository (IR), and the RIM system for the University of Miami (UM). The UML Esploro Implementation team leveraged Esploro’s Artificial intelligence and Machine Learning features to train the system to automatically capture and fetch relevant scholarly outputs produced by researchers affiliated with UM. Further, we consider …

Leading The Way: University Libraries Advancing Sustainable Development Goals, Modiehi Rammutloa, Lorette Jacobs

Proceedings of the IATUL Conferences

Universities play a critical role in achieving Sustainable Development Goals (SDGs) through their mandate of teaching, education, research, and community engagements. Through their support of the mother body, university libraries provide access to information towards the successful achievement of SDGs. One way of achieving the SDGs is through citizen science. Citizen science is the involvement of community members in scientific research. The success of citizen science projects towards achieving SDGs has been vastly reported in the literature. Data produced from citizen science projects can be used towards achieving SDGs. This is where academic librarians can play a critical role in …

Peer Review Worksheet, Kristin Browning Leaman, Adriana Harmeyer

Archival and Primary Souce Literacy Toolkit

No abstract provided.

Measurement Of Vapour Pressure, Miscibility And Thermal Conductivity For Binary And Ternary Refrigerant Lubricant Mixtures In The Context Of Heat Pump Tumble Dryers, Katharina Stockel, Ramona Nosbers, Riley Barta, Christiane Thomas

School of Mechanical Engineering Faculty Publications

Household appliances need to be both efficient and cost-effective. As a result, electrically driven tumble dryers were converted to heat pump driven ones several years ago in order to comply with energy directives, in this case in Germany. In order to increase the efficiency of heat pumps of different performance classes, the use of zeotropic refrigerant mixtures can be useful, since the temperature glide during the phase change of the refrigerant mixture can be adapted to the temperature gradients of the secondary fluids. In order to take advantage of this unique property, a refrigerant mixture selection was carried out by …

Development Of A Cooperative Perception System, Yiheng Feng, Andrew Tarko

Center for Connected and Automated Transportation

Cooperative perception that integrates sensing capabilities from both infrastructure and vehicles can greatly benefit the transportation system in terms of safety and data acquisition. In this project, a prototype of such a system was developed and evaluated by integrating a Lidar-based infrastructure detection system (facilitated with a portable Traffic Scanner, TScan) with an SAE Level 4 connected and automated vehicle (CAV). Vehicle-to-everything (V2X) communication devices were installed on both the TScan and the CAV to enable real-time message transmission of detection results in the form of SAE J2735 Basic Safety Messages (BSMs). The prototype system was validated using a case …

Applications Of Ai Technologies As A Tutor In Teaching And Learning In Class, Young B. Choi

KAUPA Letters

As AI technologies continue to be applied in various domains, their application in education is becoming a globally significant issue. This paper aims to explore the implementation of AI technologies in teaching and learning within the classroom setting. Additionally, it will address the relevant issues that need to be resolved in order to minimize the potential negative aspects of AI technology applications in education.

Recollections And Reflections On Syngman Rhee (이승만), Yeomin Yoon

KAUPA Letters

No abstract provided.

Corrigendum: Moving Beyond Dosage And Adherence: A Protocol For Capturing Dimensions Of Active Child Engagement As A Measure Of Fidelity For Social-Emotional Learning Interventions, Brianna L. Devlin, Tanya M. Paes, Elyssa A. Geer, Lindsey M. Bryant, Tracy M. Zehner, Irem Korucu, Kathleen Morse, Robert Duncan, David J. Purpura, Sara A. Schmitt

Purdue Center for Early Learning Faculty and Staff Publications

A correction to "Moving beyond dosage and adherence: A protocol for capturing dimensions of active child engagement as a measure of fidelity for social-emotional learning interventions."

Emergent Bilinguals’ Participation In Multilingual Engineering Learning Ecologies, Alberto Esquinca, Maria Teresa De La Piedra, Lidia Herrera-Rocha

Journal of Pre-College Engineering Education Research (J-PEER)

Students classified as English language learners (ELLs), many of whom are also Hispanic/Latine´/x, are at times excluded from opportunities to engage in engineering design experiences due to the emphasis on learning English. In dual language bilingual education, however, language policies that allow for the use and development of more than one language afford opportunities for ELLs that are not available in monolingual environments. We draw on a multilingual learning ecology theoretical framework to analyze data gathered from a two-year ethnographic study. During approximately 200 hours of field work, we gathered multiple forms of data through ethnographic methods, to include field …

Exfoliation And Spray Deposition Of Graphene Nanoplatelets In Ethyl Acetate And Acetone: Implications For Additive Manufacturing Of Low-Cost Electrodes And Heat Sinks, Muhammed Ramazan Oduncu, Zhifan Ke, Bingyuan Zhao, Zhongxia Shang, Robin Simpson, Haiyan Wang, Alexander Wei

Department of Chemistry Faculty Publications

Nonaqueous dispersions of graphene nanoplatelets (GrNPs) can be used to prepare thin films and coatings free of surfactants, but typically involve polar organic solvents with high boiling points and low exposure limits. Here, we describe the mechanochemical exfoliation and dispersion of GrNPs in volatile aprotic solvents such as ethyl acetate (EtOAc) and acetone, which rank favorably in green solvent selection guides. GrNPs in powder form were exfoliated with a solvent on a horizontal ball mill for 48 h and then sonicated at moderate power to produce suspensions in excess of 300 μg/mL with minimum loss of dispersion stability over 7 …

Using Behavior Sequence Analysis To Study Teams During Long- Duration Isolation And Confinement, Andres Käosaar, Dr. Nathan Smith, Dr. David A. Keatley, Pranav Ambhorkar, Dr. Moritz Von Looz, Konstantinos Konstantinidis

Journal of Human Performance in Extreme Environments

With a renewed impetus and appetite for human space exploration, both government-funded agencies and private companies are focusing on longer and farther crewed missions into the solar system. Such space missions rely on highly interdependent teams living and working together in isolated, confined, and extreme (ICE) environments. Understanding the behavioral patterns of teams in ICE environments is, thus, paramount for the future success of such missions. Due to the complexity of studying ICE teams, several researchers have called for methodological innovations to advance knowledge in this area. In the current research, a proof-of-concept methodological approach is introduced that provides a …

Influence Of Core Temperature Changes During Whole-Body Warming And Cooling On Cutaneous Vascular Reactivity, Lydia Tsoutsoubi, Leonidas G. Ioannou, Stephen S. Cheung, Andreas D. Flouris

Journal of Human Performance in Extreme Environments

Objective: Endothelial function, the ability of cells of the vascular endothelial wall to secrete compounds, is linked with metabolic and cardiovascular disease risks. One of the most well-known noninvasive tests used to assess skin vascular reactivity as a measure of endothelial function is the reactive hyperemic response test (RHRT). However, there is lack of consensus regarding the impact of thermoregulation on endothelial (dys)function and the results from the RHRT. Thus, the aim of the present study was to investigate the impact of core temperature on cutaneous vascular reactivity, as assessed via the finger RHRT. Approach: Following a 15-minute baseline period, …

Learning In A Crisis Moment: A Randomized Controlled Trial In Emergency Bystander Intervention, Caitlin Mcgaffick, Noor Gulrajani, Nan Kong, Nicole Adams

Purdue University Libraries Open Access Publishing Fund

Background

Opioid overdose is the leading cause of injury-related death in the United States. Individuals who overdose outside of clinical settings have more positive clinical outcomes when they receive naloxone, an opioid antagonist, from a bystander as an early intervention before emergency personnel arrive. However, there is a gap in knowledge about successful instantaneous learning and intervention in a real-life stressful environment. The objective of this study is to explore the efficacy of different instructional delivery methods for bystanders in a stressful environment. We aim to evaluate which methods are most effective for instantaneous learning, successful intervention, and improved clinical …

Use Them Or Lose Them: Are Manipulatives Needed To Assess Numeracy And Geometry Performance In Preschool?, Connor D. O'Rear, Erica L. Zippert, Patrick Ehrman, Lauren Westerberg, Christopher J. Lonigan, David J. Purpura

Purdue Center for Early Learning Faculty and Staff Publications

In two studies, we investigated whether using three-dimensional (3D) manipulatives during assessment aided performance on a variety of preschool mathematics tasks compared to pictorial representations. On measures of children's understanding of counting and cardinality (n = 103), there was no difference in performance between manipulatives and pictures, with Bayes factors suggesting moderate evidence in favor of the null hypothesis. On a measure of children's shape identification (n = 93), there was no difference in performance between objects and pictures, with Bayes factors suggesting moderate evidence in favor of the null hypothesis. These results suggest flexibility in the materials …

International Comparisons Of The Home Mathematics Environment And Relations With Children's Mathematical Achievement, Alexa Ellis, Jimena Cosso, Robert Duncan, María Inés Susperreguy, Victoria Simms, David J. Purpura

Purdue Center for Early Learning Faculty and Staff Publications

Background: Home mathematics environment (HME) research has focused on parent–child interactions surrounding numerical activities as measured by the frequency of engaging in such activities. However, HME survey questions have been developed from limited perspectives (e.g., Early Childhood Research Quarterly, 27, 2012, 231; Journal of Social Issues, 64, 2008, 95; Early childhood mathematics education research: Learning trajectories for young children, Routledge, New York, 2009), by researchers from a small subset of countries (15; Psychological Bulletin, 147, 2020, 565), which may skew our interpretations. Aims and Sample: This study broadened international representation by leveraging secondary data from the 2019 TIMSS to examine …

Evaluating The Efficacy Of Virtual Reality (Vr) Training Devices For Pilot Training, Ryan Guthridge, Virginia Clinton-Lisell

Journal of Aviation Technology and Engineering

Virtual Reality (VR) technology is a quickly advancing field that has many documented benefits, including highly detailed environments, accuracy to the real world, and low cost of entry in the flight simulation market. At the time of this study, VR technology has not been well tested or widely accepted in the aviation industry. In this mixed methods study, quantitative and qualitative data was collected on beginning-level instrument pilots (n = 120) while performing a visual traffic pattern at an airport. A one-way ANOVA was used to evaluate the equivalence of each group in the study based on previous flight and …

Cardiac Output And Stroke Volume From The Pneumocardiogram: A New Mechanistic Insight And Practical Calculation, Charles F. Babbs

Weldon School of Biomedical Engineering Faculty Working Papers

This paper presents a new and more complete mechanism for the genesis of the pneumocardiogram—a record of the small oscillations in airflow in the trachea and upper airways accompanying each heartbeat. This signal may be the basis of a simple, inexpensive and noninvasive measure of cardiac stroke volume; however, research into its practical use has languished because of poor understanding of its underlying cause and meaning. This paper explains the genesis of the pneumocardiogram, based upon net changes in intrathoracic blood volume during the cardiac cycle, together with low pass filtering of the volume signal by airway resistance and lung-chest …

Rapid And Efficient Computation Of Cell Trajectories During Ultrasonic Focusing, Charles F. Babbs, Mary V. Lang

Weldon School of Biomedical Engineering Faculty Working Papers

This biophysical analysis explores the first-principles physics of movement of white blood cell sized particles, suspended in an aqueous fluid and experiencing progressive or standing waves of acoustic pressure. In many current applications the cells are gradually nudged or herded toward the antinodes of the standing wave, providing a degree of acoustic focusing and concentration of the cells in layers perpendicular to the direction of sound propagation. Here the underlying biomechanics of this phenomenon are analyzed specifically for the viscous regime of water--as opposed to air--and for small diameter microscopic spheroids such as living cells--as opposed to large diameter, macroscopic …