Digital Commons Network^™

Amplifying Underrepresented Voices: Advancing Citation Justice In Scholarly Communication, Heather Cunningham

Proceedings of the IATUL Conferences

Voices of scholars are raised and amplified through the academic currency of citations. However, not all voices are heard and shared equally. Citation justice is an increasingly recognized issue within academic circles, focusing on the under-citation of women and people of color. This systemic bias, evident across many disciplines, impacts career progression, grant acquisition, and ultimately diversity among decision-makers. Citation practices are pivotal in shaping academic discourse, research, and education. Despite the significant influence of these practices, there is currently no comprehensive method to assess citation biases based on the demographics of authors. Efforts to measure diversity through computational analysis …

Dartbot: Overhand Throwing Of Deformable Objects With Tactile Sensing And Reinforcement Learning, Shoaib Aslam, Krish Kumar, Pokuang Zhou, Hongyu Yu, Michael Yu Wang, Yu She

School of Industrial Engineering Faculty Publications

Object transfer through throwing is a classic dynamic manipulation task that necessitates precise control and perception capabilities. However, developing dynamic models for unstructured environments using analytical methods presents challenges. In this study, we present DartBot, a robot that integrates tactile exploration and reinforcement learning to achieve robust throwing skills for nonrigid relatively small objects under the influence of moment of inertia which cause the object to spin in the air. Unlike traditional sim-to-real transfer methods, our approach involves direct training of the agent on a real hardware robot equipped with a high-resolution tactile sensor, enabling reinforced learning in a realistic …

Perceived And Recorded Temperature In Aircraft Cabins During 143 Flights, Matthew Nicholls, Peter Vink

Journal of Aviation Technology and Engineering

This essay reports on the perceived and recorded temperature in aircraft cabins during 143 flights. In each flight, passengers reported their experience. They recorded temperature and humidity after boarding and one hour later. The reports show that fewer than half of the passengers perceived the temperature as “good.” Most passengers (39%) perceived it as hot, and some (17%) perceived it as cold. Comparing the temperatures with guidelines shows that 18% of the recorded temperatures in the cabin were empirically too hot and 2% empirically too cold. The differences between passengers in what they perceive as a good temperature are large, …

Lowell Hardin: Mentor Extraordinaire, Larry L. Murdock, Thomas W. Hertel, Gebisa Ejeta

Purdue University Press Books

Lowell Stewart Hardin (1917–2015), an Indiana farm boy who became an enormously influential international agriculturalist, made the world a better place for the poor and the hungry on this earth. For seventeen years he led the Ford Foundation’s agricultural development efforts, contributing to the Green Revolution. He helped to found and guide international agriculture research centers in Africa, Asia, and Latin America. He inspired others to get involved and opened doors for them. He taught by example, gave others credit, and always stepped back, avoiding the limelight himself. In this volume, twenty-two people who knew him well share stories of …

Kaupa Letters: Volume 12, Issue 3, Korean American University Professors Association

KAUPA Letters

No abstract provided.

Designing An Interactive Application To Prevent Runway Incursion: A Systems Engineering Approach, Yixuan Cheng, Dahai Liu, Dennis Vincenzi, Donald S. Metscher

Journal of Aviation Technology and Engineering

Runway incursion is a leading cause of serious incidents and accidents at airports. A common cause of runway incursions is unfamiliarity with the airport layout. To address this, we designed an electronically interactive application intended as a practice tool for pilots during flight preparation. The aim of this application is to improve pilots’ familiarity with airports, ultimately helping to reduce runway incursions, with the goals of being interactive, affordable, easily accessible, and designed for use on mobile devices. We applied a systems engineering approach that adheres to human factors engineering principles to ensure user-friendly design and optimization of the interaction …

The Economics And Productivity Of Us Cow-Calf Production, Richard Nehring, Hannah Shear, Kelvin L. Leibold, Andrew Swanson

Journal of Applied Farm Economics

We explore US beef cow-calf production in 2018 and estimate net returns, returns to scale, and technical efficiency associated with backgrounding versus nonbackgrounding by size and production system. We determine the relative profitability of cow-calf operations by type, region, and size. Results, using both stochastic production frontier analysis and data envelopment analysis, indicate that larger operations tend to be more scale and technically efficient than smaller operations. While larger operations may be more scale and technically efficient and have lower variable costs per cow, off-farm income helps smaller operations become competitive. The availability of detailed cost of production information in …

Imagining Better: Requiring Trust And Imagination In Formal Engineering Education, Sneha Rathi, Jacqueline Handley

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

Teachers and students bear the brunt of enacting K–12 engineering while having little input into engineering practices or values. In this reflective essay, a high school engineering teacher and an engineering education researcher reflect on a class bridging engineering and social justice. We describe the development of politicized trust with each other and students while partnering around shared commitments at a predominately Black school (e.g., Vakil et al., 2016). We also explore challenges in decentering conceptions of engineering derived from depoliticized, exclusionary practice. We demonstrate an urgent need to center educators and students from marginalized identities in formal engineering education.

The Dim Prospects Of A Child Find: Journal Entries Of An Academic, Engineer, And Mother Navigating Special Education Services, Idalis Villanueva Alarcon

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

This provocation is a journaling exercise to uncover the author’s experiences of navigating child find, a process to identify specific learning disability needs for my oldest child. While the Individuals with Disabilities Education Act provides provisions to protect and support children with special needs, private schools do not operate equally. When considering how these inequities in the educational system overlap with precollege engineering education, there is a large gap the literature, positioning a dire need to move disability studies into the precollege engineering education space. The critical authoethnographic journal sheds light on the inequities and educational gaps that are present …

A Continuum Mechanical Model Of The Brain During Closed Head Injury, Charles F. Babbs

Weldon School of Biomedical Engineering Faculty Working Papers

Exactly how traumatic axonal injury happens as a result of brief, intense acceleration of the head remains a mystery. The same can be said about traumatic microbleeds observed in MRI scans of people suffering concussions. This paper explores the mechanism of injury in terms of continuum biomechanics. A full-sized viscoelastic model of the human brain is developed that is subjected to impact with the rigid skull after crossing the subarachnoid space in response to brief, intense whole head acceleration, as might occur in falls or in contact sports. The brain is considered a compressible viscoelastic body of approximately uniform density, …

Current Food Trade Helps Mitigate Future Climate Change Impacts In Lower-Income Nations, Kushank Bajaj, Zia Mehrabi, Thomas O. Kastner, Jonas Jägermeyr, Christoph Müller, Florian , Schwarzmüller, Thomas Hertel, Navin Ramankutty

Department of Agricultural Economics Faculty Publications

The risk of national food supply disruptions is linked to both domestic production and food imports. But assessments of climate change risks for food systems typically focus on the impacts on domestic production, ignoring climate impacts in supplying regions. Here, we use global crop modeling data in combination with current trade flows to evaluate potential climate change impacts on national food supply, comparing impacts on domestic production alone (domestic production impacts) to impacts considering how climate change impacts production in all source regions (consumption impact). Under 2°C additional global mean warming over present day, our analysis highlights that climate impacts …

Application Of Physics-Informed Neural Networks On Crop Yield Prediction At Multiple Scales, Aditya P. Prabhu, Pratishtha Poudel, James V. Krogmeier

Discovery Undergraduate Interdisciplinary Research Internship

Accurately predicting crop yields is a critical challenge in sustainable agriculture, food security, and farm management. Traditional process-based models rely on agronomic domain knowledge, crop physiology and statistical approaches, while purely data-driven approaches leverage machine learning or deep learning models using meteorological and spatial data. Unfortunately, these black-box models(Data-drive approaches) often lack interpretability and fail to incorporate well-established physical principles. This project explores a hybrid approach by implementing Physics Informed Neural Networks, mainly, physics-based recurrent neural networks (PI-RNNs) for time-series yield prediction. PINNs allow for the integration of scientific knowledge directly into the model by embedding physical laws as constraints …

Effective Shoulder Width On Rural Highway System Related To Roadway Departure Crashes, Mario A. Barahona, Vamsi Krishna Bandaru, Mario A. Romero, Andrew Tarko

JTRP Technical Reports

Roadway design plays a crucial role in traffic safety, particularly on rural roads. This research investigates the safety effectiveness of shoulder width on Indiana’s rural two-lane highways, and to use this understanding to provide a basis for more effective shoulder improvement programs. Although previous studies have established the benefits of shoulder widening in other states, limited research has been conducted in Indiana conditions. This research aims to evaluate the safety effectiveness of shoulders on rural roads in Indiana and to propose a practical and systemic approach to identifying road segments that require additional attention and possible need for shoulder improvements. …

Backcalculated Dynamic Modulus Master Curve From The Time Histories Of Falling Weight Deflectometer Surface Deflections, Mohammad Ali Notani, Seonghwan Cho, John E. Haddock

JTRP Technical Reports

Accurate structural evaluation of flexible pavements is important for cost-efficient maintenance and rehabilitation (M&R) strategies. Traditional back-calculation methods based on Falling Weight Deflectometer (FWD) data assume elastic behavior, overlooking the viscoelastic nature of asphalt materials and subsequently leading to inaccuracies. This study introduces a mechanistic-based back-calculation technique to estimate the dynamic modulus (E*) master curve directly from FWD time-history data. By integrating layered elastic theory with viscoelastic principles, the proposed method first determines the relaxation modulus, E(t), using Differential-Time Fourier Transform (DTFT) analysis. This time-domain response is then converted into the frequency domain to construct the E* master …

A Study Of Suburban Arterial Safety Performance Based On Median Type, Andrew Tarko, Qiming Guo, Priya Darshini Narayanan, Mario A. Romero, Vamsi K. Bandaru

JTRP Technical Reports

Suburban arterial roadways must serve two conflicting road functions: regional mobility and access to the abutting land. The potential for conflicts between traffic passing through and traffic accessing road from the neighboring areas could raise safety concerns. Selecting an adequate cross-section is among important decisions that road designers and traffic engineers consider when mitigating the mentioned conflict. The following three alternative treatments offer different access control levels: undivided cross-section with no median, two-way left-turn lane instead of a typical median, and non-traversable median. The frequency of access points and the selected median treatment option should be commensurate.

Although it is …

Embrace The Journey: Exploring Induction Experiences Of Teachers In Ohio Independent Stem Schools, Laura Sass

Indiana STEM Education Conference

The beginning years of a new teacher are a critical period. This study investigated perceptions of induction activities of new teachers in Ohio Independent STEM schools. STEM-based pedagogies such as problem-based learning and inquiry are core strategies in STEM schools but can be new for beginning teachers. Through a Q-sort, thirteen participants from three Independent STEM Schools ranked statements on a +5 to -5 scale of agreement. This along with a post-sort survey resulted in themes. Positive school culture and colleague collaboration and the impact of the mentoring were found to be the most impactful. This research aligns with literature …

Indiana Stem Teachers’ Perceptions Of The Shift From In-Person To Virtual Training During The Covid-19 Pandemic, Steve Heinold

Indiana STEM Education Conference

The COVID-19 pandemic brought uncertainty to Indiana teachers in 2020. School closings caused disruptions to teachers’ classroom settings, ongoing training, and social and mental well-being (Pozo-Rico et al., 2020). Indiana GEAR UP’s commitment to teacher professional development for STEM educators led to a shift from their in-person summer teacher training sessions to virtual, just months after the school shutdowns in spring 2020. Participant evaluations showed that teachers appreciated the virtual training options and were able to learn new strategies to apply to their new virtual learning spaces. The online training sessions also had drawbacks. This research brief describes recommendations to …

Spatio-Visual Reasoning And Teamwork Through Hands-On Stem Construction Activities, Comfort Temitope Aje, Maria Eloisa C. Nuguid, Melihan Ünlü, Humphrey Chinenye Ochulor

Indiana STEM Education Conference

This study examined a STEM activity in which students in grades K-6 designed and built a model of Snoopy’s doghouse with considerations for constraints, teamwork, and iterative design. By combining spatial reasoning with imagination and visualization, students collaborated to create 3-D structures from 2-D plans, demonstrating enhanced spatial visualization and the ability to connect geometry to a tangible engineering task. The findings highlight the value of spatio-visual design activities in promoting skills like spatial reasoning, critical thinking, and problem-solving.

Supporting Black Math Educators: A Call To Action, Jonathan Dinkins

Indiana STEM Education Conference

Supporting Black math educators is crucial for fostering a more equitable and inclusive educational environment. Some research has shown that ongoing support from administration, various types of professional development (PD) opportunities, and mentoring equip Black math educators with the tools they need to be successful and grow with their educational pursuits (Frank et al., 2021; Moseley, 2018; Sun, 2018). This research brief will define the meaning of support for Black math educators, identify ways in which these supports can be effective, and suggest additional research necessary to continue to push the needle towards a more inclusive educational environment.

Leveraging Undergraduate Expertise For Effective Stem Instruction: Insights From A Forensic Science Teaching Partnership, Swagata Sarkar, Hui-Hui Wang, Austin R. Jenkins, Mariah K. Stollar

Indiana STEM Education Conference

Although integrated science, technology, engineering, and mathematics (STEM) instruction has been cited as a viable instructional approach to increasing the number of students interested and prepared to enter the STEM workforce, teacher content knowledge can be a limiting factor to effective implementation (Ejiwale, 2013). To address this limitation, college STEM majors can use their content expertise to support the development and implementation of integrated STEM experiences for K-12 students (Ferrara et al., 2018). This research brief reports on a university-high school partnership where undergraduate students in a university forensic science club created and implemented integrated STEM lessons in a local …

A Comparison Of Professional Development For Teachers Of Mathematics In Belize And The United States, David Feikes

Indiana STEM Education Conference

This paper provides a limited comparison of professional development (PD) workshops conducted in Belize and in the United States (US). Three workshops were conducted in Belize; 2019, 2022, and 2024. Multiple workshops were conducted in the US between 2021 and 2023. All workshops in Belize and the US were one week in duration and covered similar topics. Although the working conditions in the schools and workshops were different in each country, data analysis found similar teacher satisfaction and growth results.

The Aftermath Of An Earthquake: Healing Power Of Engineering For Turkish Elementary School Children, Pinar Fettahlioglu, Senay Purzer, Cagan Findikkiran

Indiana STEM Education Conference

The February 6th, 2023, earthquake significantly impacted children in Turkey, causing both physical and emotional challenges. To help students enhance their understanding of earthquakes and their impact, we have integrated engineering-based STEM activities in a 5th-grade classroom. Students designed earthquake-proof structures and tested their strength. The research involved 15 students from the earthquake-affected region of Adana. Data included a conceptual understanding scale using a single-group pre-test and post-test design. Analysis indicated that students had limited prior knowledge about the causes of and safety measures for earthquakes before the intervention. Post-test results revealed statistically significant improvements in their learning.

A Unified Rheological Parameter For Concrete: Application Of The Shear Work Index In Flowability Optimization, Wang Yao, Jihong Gao, Kunmiao Xu, Baolin Guo, Yongzhi Guo, Qinfei Li

International Conference on Durability of Concrete Structures

Adequate flowability is crucial to ensure proper homogeneity, mechanical properties, and durability of hardened concrete. A new parameter called the Shear Work Index (SWI), which combines yield stress and plastic viscosity, was recently proposed by the authors to evaluate concrete flowability. Factors that can influence SWI are analysed in this paper. Application methods of SWI are demonstrated through case studies involving the evaluation of rheology-modifying materials, the selection of the optimal manufactured sand replacement ratio in mixed sand, and the determination of concrete vibration time. The findings highlight the effectiveness of SWI as a comprehensive parameter for optimising concrete mix …

Supporting The Self-Confidence Of A Student With Mathematics Learning Disabilities Through The Engineering Design Process, Esra Yilmaz Bilir, Cetin Kursat Bilir, Danyal Soybas

Indiana STEM Education Conference

Although STEM education has been widely studied, research on its application for students with Mathematics Learning Disabilities (MLDs) remains limited. One promising approach is using an engineering design process (EDP) (Yilmaz Bilir, 2021), which promotes hands-on problem-solving and fosters cognitive and emotional growth. This study explores the self-confidence of an MLD student during the preparation stage of an EDP. The results indicate that the student’s self-confidence in STEM subjects and social communication skills improved even at the preparation stage. These findings emphasize the value of the preparation stage of an EDP and offer insights for designing effective STEM learning modules.

Stem Education In Indiana: Analyzing The Availability Of Stem-Certified Schools For Underrepresented Communities, Bryan J. Duarte

Indiana STEM Education Conference

This study examines the equity of access to STEM-certified schools in Indiana, focusing on differences in student demographics between STEM-certified and non-STEM-certified schools. The results show no statistically significant differences in the percentage of female, non-White, or lower socio-economic students between the two groups. However, significant differences were found in the percentages of Latiné/a/o/x, Native Hawaiian or Pacific Islander, and Asian students, with these groups being underrepresented in STEM-certified schools compared to non-STEM-certified schools.

Boosting Computational Thinking In Integrated Stem Education With Cad, Hyeong Kyun Park, Jung Han, Yunjin Lim

Indiana STEM Education Conference

Integrated STEM education offers a powerful approach to enhancing students’ learning. By integrating science inquiry, technological literacy, engineering design, and mathematical thinking, integrated STEM fosters students’ 21st-century competencies, such as creativity, critical thinking, collaboration, and computational thinking. Drawing from a national integrated STEM project, this research uses a classroom case study to investigate the integration of Computer-Aided Design (CAD) and 3D printing into a STEM learning activity. It examines the use of mathematical computation to determine the best solution for a prototype that meet functional criteria. This research highlights how introducing CAD instruction enhances computational thinking within a conceptual framework …

The Power Of Our Words: Imperatives And Personal Pronouns In Written And Enacted Mathematics Curriculum, Amanda Huffman Hayes

Indiana STEM Education Conference

As teachers, our use of imperatives (e.g., find, explain) and personal pronouns (e.g., you, we, I) contribute to our students’ learning and the roles they take in class. Using an ethnographic case study design, I explored the language of the written and enacted curriculum in a fundamental algebra course. My analysis revealed the power of language in the relationship between the authors and readers and the teacher and students. Providing students with a share in authority can increase their engagement.

In-Situ Tests Of Transport Properties Of Near-Surface Concrete, Kai Yang, P.A. Muhammed Basheer, Fengyuan Yang, Da Xia, Basilios Tsikouras

International Conference on Durability of Concrete Structures

Determining the water permeability of concrete in structures remains a conundrum because of difficulties in removing the influences of moisture. This study describes the extended flow-net theory developed on the basis of the two-pressure head concept, which provides a means of measuring permeability under the partially saturated condition. Surface mounted tests and the standard laboratory water penetration tests were carried out to verify this approach. Before determining the water permeability, steady state flow rates at two different pressure levels were evaluated and the effects of initial moisture conditions on flow behaviour were investigated. The results indicate that the proposed approach …

Integrating Turtle Graphics And Engineering Design: Enhancing Problem-Solving And Critical Thinking Through Digital And Physical Prototyping, Abigail Erskine

Indiana STEM Education Conference

This research brief is a review of literature on integrating Turtle Graphics and engineering design to enhance students' problem-solving and critical thinking through prototyping. Integrating Turtle Graphics with digital and physical prototyping engages students in the engineering design process, helping them bridge abstract mathematical concepts with real-world applications. By combining programming and engineering design, Turtle Graphics supports complex tasks like visualization and design modeling, which improves students’ critical thinking, design thinking, and problem-solving skills. Through iterative testing and refinement, students gain practical insights into engineering concepts such as modeling and creating prototypes.

Proceedings Of The Tenth Annual Indiana Stem Education Conference: Generational Advances Through Stem Education, William S. Walker Iii, Lynn A. Bryan, S Selcen Guzey

Indiana STEM Education Conference

The Proceedings of the Tenth Annual Indiana STEM Education Conference are edited by the Center for Advancing the Teaching and Learning of STEM (CATALYST, https://www.education.purdue.edu/catalyst/) at Purdue University. The theme for the 2025 conference is Generational Advances through STEM Education. This year’s conference provides opportunities to learn about effective STEM education strategies, curriculum, and resources to engage students by considering the advances and impact of STEM.