Digital Commons Network^™

The Bond Behaviour Between Concrete And Corroded Reinforcement: State Of The Art, Yuxi Zhao, H. Lin

International Conference on Durability of Concrete Structures

The corrosion of reinforcing steel bar embedded in concrete leads to the bond deterioration. This literature review summarises the influence of corrosion on bond strength and bond-slip behaviour. The influence of corrosion on bond strength has been intensively investigated and the main influencing parameters, including the corrosion conditions of steel bars, the geometry and the corrosive environment, have been well recognized. Based on the previous investigations and the author’s experimental work, an improved bond strength model, which can account for various parameters and is proved to agree well with experimental results in the literature, is developed. The literature survey also …

Estimated Service Life Of Carbonation Exposed (Cracked) Concrete With Pozzolans Or Self-Healing Agents, Philip Van Den Heede, Nele De Belie

International Conference on Durability of Concrete Structures

Today, concrete with large portions of ordinary Portland cement (OPC) replaced by fly ash and self-healing concrete count as potential sustainable alternatives to traditional concrete. For the first concrete type, the increased sustainability lies in lowering the carbon footprint which is largely attributable to cement. For the second one that should be able to heal cracks autonomously upon occurrence, an extended service life is the key objective. In this paper, both concrete types were evaluated in terms of service life in carbonation exposed environments. When using the probabilistic model for carbonation-induced steel depassivation of fib Bulletin 34 with mix specific …

Service Life And Life-Cycle Assessment Of Reinforced Concrete With Fly Ash And Limestone Calcined Clay Cement, Ravindra Gettu, Radhakrishna G. Pillai, Manu Santhanam, Sundar Rathnarajan, Anusha Basavaraj, Sripriya Raju, Yuvaraj Dhandapani

International Conference on Durability of Concrete Structures

Environmental impact due to the emission of carbon dioxide during concrete production can be taken care by reducing the clinker content in the cement. The clinker content can be reduced by replacing it with fly ash and limestone calcined clay. Such systems can have a potential to exhibit enhanced durability/service life when exposed to chloride and carbon dioxide. However, estimating probabilistic service life of concretes with such alternative binder systems is difficult due to the lack of quantitative estimates of the input parameters such as chloride diffusion coefficient (D_Cl), ageing coefficient (m), carbonation coefficient (K_CO2), and …

New Model For Natural Carbonation Prediction In Reinforced Concrete – Concept And Validation On Chemical Admixtures, Stephen O. Ekolu, M Raats

International Conference on Durability of Concrete Structures

A new model for prediction of natural carbonation in reinforced concrete structures has recently been developed and presented in (Ekolu, 2018). For brevity, the model is referred to as ESS model. It employs concrete strength as the primary property depicting core carbonation behaviour of any given concrete while other factors induce secondary influence. Chemical admixtures in concrete significantly influence concrete behaviour. Using experimental data from the literature (Dan-Herrera et al., 2015), the model behaviour is verified under use of various types of chemical admixtures of concrete including internal curing, shrinkage reducing, viscosity modifying, and high range water reducing admixtures. Class …

Performance Of Concrete Made With A Calcined Clay – Limestone-Portland Cement Exposed To Natural Conditions, Fernando Martirena, Ernesto Díaz, Dayran Rocha, Hamed Maraghechi, Karen Louise Scrivener

International Conference on Durability of Concrete Structures

This work presents the results of an investigation carried out to assess durability of concrete made with a calcined clay- limestone-Portland cement with 47% of clinker, hereafter named LC3, produced during an industrial trial in 2013. LC3 was used to cast concrete blocks and later expose them at a natural location at the northern coast of Cuba. Reference concrete was cast with Cuban Portland cement having 88% of clinker. Throughout three years (2015, 2016, 2017) concrete cores were systematically taken and the specimens were subjected to a testing program that included Formation factor, chloride profiling, surface resistivity, air permeability and …

An Extensible Geospatial Data Framework (Geoedf) For Fair Science, Carol Song, Rajesh Kalyanam, Lan Zhao

Purdue GIS Day

The growing urgency in dealing with the 21st century’s grand challenges associated with increasing population, food and water security, frequently occurring natural disasters, and changing climate demands innovative, collaborative, and multidisciplinary solutions for sustainability and resilience. However, scientific data, especially geospatial data, presents significant barriers to the effective access, use and sharing of data as they come in large volumes, from different sources, and with widely varying formats, resolutions, or annotation schemas that can differ among disciplines or even research groups. This presentation describes a recently funded NSF CSSI project to develop an open source, extensible geospatial data framework (GeoEDF), …

Soil Erosion Analysis Of The Monroe County’S Watersheds In Indiana, Danielli De Melo Moura, Jie Shan

Purdue GIS Day

This study was carried out to spatially predict the amount of soil loss (tons/ha/year ) of Monroe County’s watersheds using Geographic Information System (GIS). Revised Universal Soil Loss Equation (RUSLE) was used to estimate potential soil losses by using information such as rainfall data for calculating the rainfall erosivity (R) , soil map for calculating the soil erodibility (K), digital elevation model for obtaining the topography factor (LS) and vegetation/cropland cover for calculating the cover management factor (C) and support practice factor (P). The result of the analysis depicted that the soil loss rate in Moroe’s watersheds ranges from 0 …

Is Your Library Ready For The Reality Of Virtual Reality? What You Need To Know And Why It Belongs In Your Library, Carl R. Grant, Stephen Rhind-Tutt

Charleston Library Conference

VR is no longer just gaming. It’s increasingly being deployed across academic campuses and is becoming indispensable in fields ranging from the humanities to engineering to anthropology. A recent survey indicated that 100% of ARL campuses were using VR, with 40% of libraries actively supporting it. This paper discusses practical examples of how libraries are helping their institutions build out virtual reality, utilizing 3D objects and explains why the library is the best place to do so. It provides a basic grounding in VR and related areas, showing what it is and why it's important to libraries. Specific attention is …

Read And Publish: What Can Libraries Expect?, Josh Horowitz

Charleston Library Conference

The author provides a publisher's perspective on the challenges and opportunities faced by a mid-sized society in navigating the current transition to open access licensing models.

East Meets West: The Japan Association Of National University Libraries (Janul) And The University Of Central Florida (Ucf) Exchange Librarians And Learning Commons Information, Barbara G. Tierney, Yuka Taniguchi

Charleston Library Conference

Is your library contemplating an international librarian exchange? Such exchanges not only increase participants’ understanding of other cultures, they also challenge participants to look at their own cultures from a new perspective. Two academic librarians, Yuka Taniguchi from Kobe University1 (Japan) and Barbara Tierney from the University of Central Florida2 discuss their visits to each other’s libraries in 2016–2017 to share information about their respective learning commons and outreach programs. This article focuses on the lessons learned for each librarian and practical tips on how to accomplish a successful academic library foreign exchange.

Data Curation Workshop: Tips And Tools For Today, Matthew M. Benzing

Charleston Library Conference

The current state of research data is like a disorganized photo collection: a mix of formats scattered across different media without a lot of authority control. That is changing as the need to make data available to researchers across the world is becoming recognized. Researchers know that their data needs to be maintained and made accessible, but often they do not have the time or the inclination to get involved in all of the details. This provides an excellent opportunity for librarians. Data curation is the process of preparing data to be made available in a repository with the goal …

Guest Editorial, Jiju Anthony, Chad Laux, Beth Cudney

Computer Information Technology Faculty Publications

No abstract provided.

Recognition And Positional Identity In An Elementary Professional Learning Community: A Case Study, Christopher G. Wright, Rasheda Likely, Kristen B. Wendell, Patricia P. Paugh, Elizabeth Smith

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

Professional learning communities are typically conceived of as spaces for reducing teacher isolation, supporting informed and committed teachers, and fostering student academic gains. Focusing on a professional learning community that supported the teaching and learning of engineering in elementary schools, we also conceived of this learning environment as a space for negotiating a teacher-of- engineering identity. Calling attention to emergent issues of power and status through a lens of positional identity, this article examines a Black female educator’s sense of self as a teacher-of-engineering and how this perception was informed by participation in the professional learning community. Findings reveal that …

Do After-School Robotics Programs Expand The Pipeline Into Stem Majors In College?, Cathy Burack, Alan Melchior, Matthew Hoover

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

One result of the growing concerns over the numbers of young people moving into science, technology, engineering and mathematics (STEM)-related careers has been the expansion of formal and informal STEM education programming for pre-college youth, from elementary school through high school. While the number of programs has grown rapidly, there is little research on their long-term impacts on participant education and career trajectories. This paper presents interim findings from a multi-year longitudinal study of three national after-school robotics programs that engage students in designing, building, and competing complex robots with the goal of inspiring long-term interest in STEM. Focusing on …

How U.S. Government Policy Documents Are Addressing The Increasing National Security Implications Of Artificial Intelligence, Bert Chapman

Libraries Faculty and Staff Presentations

Artificial intelligence is affecting many areas of our lives and governmental policy. National security is one arena in which artificial intelligence is playing an increasingly important and controversial role. U.S. Government and military agencies are producing a steadily expanding corpus of publicly available literature on this topic. This literature documents how these agencies have this topic's national security implications historically and currently while also addressing potentially emerging national security issues where artificial intelligence will intersect with national security. This presentation demonstrates examples of the growing variety of publicly available national security artificial intelligence literature while also addressing the implications of …

Growing Local: The Role Of Urban Gardening In Fostering Food Security, Sustainability, And Community, Franklin Wagner, Lindsey Payne

Purdue Journal of Service-Learning and International Engagement

The downtown center of Lafayette, Indiana is situated in a food desert where access to healthy, nutritious food can be limited. Urban gardens are an effective way to increase access to healthy alternatives while also providing a number of benefits to the surrounding area, including opportunities for community growth, education, and physical activity. In summer 2016, researchers from Purdue University collaborated with Lafayette’s GrowLocal Urban Gardens Network (GrowLocal) to perform a baseline analysis of the current community gardening initiatives, and explore the possibilities for expansion, development, and future community involvement through urban gardening.

Both qualitative and quantitative data collection methods …

Across The Atlantic: Service-Learning In Spain And Morocco, Lauren Ward

Purdue Journal of Service-Learning and International Engagement

Purdue provides many activities in service-learning each year, and though they are varied experiences, many of the same lessons can be learned. I had the opportunity to participate in two service-learning study abroad trips while at Purdue- the first to Spain and Morocco, and the second to Haiti. While on these trips, I was involved in projects that seemed very different. In Morocco, my group taught high school students about the history of mathematics during the Islamic Golden Age and how mathematics is utilized in Purdue research. In Haiti, I worked with my teammates to teach water sanitation and storage …

Weather Courtyard: Reflections On Interactive Stem Learning Spaces, Ryan Day

Purdue Journal of Service-Learning and International Engagement

In this article, the author discusses his experiences in service-oriented engineering developing an interactive weather station for DCES students. Day details this process and the lessons learned over the course of the project development, as well as the project’s influence on his aspirations for a career in civil and environmental engineering. To provide substantive takeaways from the project, he concludes by reviewing the benefits of interactive STEM learning spaces in the instructional environment and links them to the impacts of the weather station project on the community.

Red Light, Purple Light! Results Of An Intervention To Promote School Readiness For Children From Low-Income Backgrounds, Megan Mcclelland, Shauna L. Tominey, Sara A. Schmitt, Bridget E. Hatfield, David J. Purpura, Christopher R. Gonzalez, Alexis N. Tracy

Purdue Center for Early Learning Faculty and Staff Publications

Considerable research has examined interventions that facilitate school readiness skills in young children. One intervention, Red Light, Purple Light Circle Time Games (RLPL; Tominey and McClelland, 2011; Schmitt et al., 2015), includes music and movement games that aim to foster self-regulation skills. The present study (N = 157) focused on children from families with low-income and compared the RLPL intervention (SR) to a revised version of RLPL that included literacy and math content (SR+) and a Business-As-Usual (BAU) control group. In both versions of the intervention, teachers were trained to administer the self-regulation intervention in preschool classrooms with coaching support. …

Argument-Driven Engineering In Middle School Science: An Exploratory Study Of Changes In Engineering Identity Over An Academic Year, Lawrence Chu, Victor Sampson, Todd L. Hutner, Stephanie Rivale, Richard H. Crawford, Christina L. Baze, Hannah S. Brooks

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

The goal of this study was to examine how the use of a new instructional model is related to changes in middle school students’ engineering identity. The intent of this instructional model, which is called argument-driven engineering (ADE), is to give students opportunities to design and critique solutions to meaningful problems using the core ideas and practices of science and engineering. The model also reflects current recommendations found in the literature for supporting the development or maintenance of engineering identity. This study took place in the context of an eighth-grade science classroom in order to explore how middle school students’ …

Emotion Recognition Using Convolutional Neural Networks, Chieh-En James Li, Lanqing Zhao

Purdue Undergraduate Research Conference

Emotion recognition recently becomes a popular topic of machine learning and computer vision and generates a wide range of applications in other academic fields as well as in our everyday life. The primary idea is to process the input of a human facial expression frame and output a result that classifies such expression into some designated emotions such as basic seven emotions or other compound emotions.The existing conventional method requires a handcrafted feature extractor of facial Action Units(AUs) to extract feature from designated Facial Landmark regions, and these extracted AUs codes are processed through traditional machine learning algorithm such as …

Grading For Growth: Using Sliding Scale Rubrics To Motivate Struggling Learners, Dina Mahmood, Hugo Jacobo

Interdisciplinary Journal of Problem-Based Learning

In an effort to adopt more equitable and humanizing grading practices, this teacher inquiry explores how educators attempted to improve students’ views of learning and assessments by utilizing rubrics on a sliding scale. Using the sliding scale rubric approach to grading provided an opportunity for students and educators to rethink how learning is evaluated. The authors found that the logistics of using sliding scale rubrics as a grading tool does need to be refined and further evaluated; however, the belief that a student can receive a grade based on her or his individual starting point did have some positive implications …

American Stem Education In Its Global, National, And Linguistic Contexts, Sezai Kocabas, Burhan Ozfidan, Lynn M. Burlbaw

Purdue University Libraries Open Access Publishing Fund

STEM education was a systematic teaching and/or learning process in the STEM fields and a positive correlation existed between STEM education, and the economic prosperity and power of a nation in the globalized world. In recent years, rising concerns have emerged about American STEM education. Many stakeholders wondered that whether the nation has enough well-qualified STEM students, teachers and workforce to maintain its current competitive edge. This study sought to answer those questions, presenting a unique view about the concerns. This study, besides, summarized selected major legislation which affected STEM Education in the United States. The results of the study …

Optimizing L2 Vocabulary Acquisition: Applied Linguistic Research, George H. Borawski

Purdue Linguistics, Literature, and Second Language Studies Conference

Any acquisition in Second Language Acquisition (SLA) starts as word recognition; as such vocabulary acquisition is integral to language learning as a whole and is a precursor to fluent communication (Ellis, 1996; Moore, 1996). To maximize SLA, vocabulary acquisition must be optimized. However, vocabulary acquisition is understudied and underutilized, especially compared to other aspects of SLA (Paribakht & Wesche, 1997). Cook states, “…the vast bulk of examinations, syllabuses, and course books around the globe show little overt influence from SLA research” (1998, p.10). Courses, teachers, and students would benefit from directly addressing SLA research, rather than utilize inefficient methods (Cook, …

An Animal-Assisted Intervention Study In The Nursing Home: Lessons Learned, Lonneke G. J. A. Schuurmans, Inge Noback, Jos M. G. A. Schols, Marie-Jose Enders-Slegers

People and Animals: The International Journal of Research and Practice

AAI studies in the nursing home pose a specific set of challenges. In this article the practical and ethical issues encountered during a Dutch psychogeriatric nursing home AAI study are addressed with the aim of sharing our experiences for future researchers as well as AAI practitioners in general.

In our study we compared three groups of clients with dementia who participated in group sessions of either visiting dog teams, visiting FurReal Friend robot animals, or visiting students (control group) and monitored the effect on social interaction and neuropsychiatric symptoms through video analysis and questionnaires. We encountered the following four categories …

“We’Re Doing Things That Are Meaningful”: Student Perspectives Of Project-Based Learning Across The Disciplines, Emily E. Virtue, Brandi N. Hinnant-Crawford

Interdisciplinary Journal of Problem-Based Learning

Supporters of project-based learning (PBL) argue that outcomes from the model include better performance in academic (Bell, 2010; Thomas, 2000) and non-academic outcomes (Saunders-Steward, Gyles, & Shore, 2010). The New Tech Network (NTN) is a school improvement network that provides training and development for high school faculty who commit to using project and/or problem-based learning as the primary instruction methodology (New Tech Network, 2017). This study uses qualitative data to investigate student perspectives of PBL across multiple disciplines at the high school level in NTN schools. Results suggest that students find value in the “hard work” they engaged in whilst …

The Effect Of Teacher Professional Development On Implementing Engineering In Elementary Schools, Teresa Porter, Meg E. West, Rachel L. Kajfez, Kathy L. Malone, Karen E. Irving

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

Increased attention on the implementation of engineering education into elementary school classrooms aims to start preparing students early for potential engineering careers. In order to efficiently and effectively add engineering concepts to the curriculum, appropriate development and facilitation of engineering design challenges are required. Therefore, professional development programs are necessary to educate teachers about engineering and how to adequately teach it. This paper explores the effects of an engineering professional development program for practicing teachers. The program included training elementary teachers about how to implement units from Engineering is Elementary (EiE) by the Science Museum of Boston into their classes. …

The Triple Jump In Problem-Based Learning: Unpacking Principles And Practices In Designing Assessment For Curriculum Alignment, Monaliza M. Chian, Susan M. Bridges, Edward C.M. Lo

Interdisciplinary Journal of Problem-Based Learning

Assessment validity, reliability, and constructive alignment to planned learning outcomes are less understood in the context of integrated, problem-based curricula. This conceptual paper examines a Triple Jump Assessment (TJA) employed as a formative and summative assessment system in the first year of an undergraduate dental program. Specifically, we deconstructed this instantiation of a TJA in terms of management and co-ordination; assessment design and item development; assessment administration; and assessment review, refinement and modification. Four core principles of TJA design for constructive alignment in an integrated, problem-based curriculum were identified as: (a) viewing the assessment design process as a collaborative and …

Elementary Teachers’ Positive And Practical Risk-Taking When Teaching Science Through Engineering Design, Jeffrey Radloff, Brenda Capobianco, Annie Dooley

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

This study examines the perspectives of three generations of elementary teachers learning to teach science using engineering design and the risks associated with implementing this innovative type of reform-based science instruction. Data were gathered using semi-structured interviews, classroom observations, and teacher reflections. Data analysis entailed open coding and document analysis. The findings indicated that there were four types of perceived risks: practical, pedagogical, conceptual, and personal. First-generation teachers exhibited conceptual risk-taking behavior, while second- and third-generation teachers reported practical, pedagogical, and personal risks. Benefits of risk-taking included increased student engagement in science, improved self-confidence in teaching science, and greater teacher …

Model Based Analysis Of The Accuracy And Precision Of Auscultatory Blood Pressure Measurements In Patients With Atrial Fibrillation, Charles F. Babbs

Weldon School of Biomedical Engineering Faculty Working Papers

Accurate measurement of blood pressure in the presence of atrial fibrillation remains an open problem. The present study combines the techniques of stochastic mathematical modeling with physiological models of the systemic circulation, cuff, and arm (1) to explore mechanisms underlying both the lack of accuracy and the lack of precision in cuff-based arterial pressure measurements during atrial fibrillation and (2) to develop strategies to correct for errors. Both the cardiovascular system and the measurement technique are described using mathematics, including both numerical techniques and analytical probability theory. Preliminary results with numerical models suggested that, despite variability, average systolic pressures tend …