Digital Commons Network^™

Engineering Performance Of Semi-Flowable Concrete With High-Volume Indigenous Scms, Arash Aghaeipour, Jingjie Wei, Kamal H. Khayat, Roberta Alfani, Erisa Myrtja

C3 Symposium 2025

Enhancing clinker efficiency and increasing limestone filler (LF) in binder are essential for engineering applications. This study explores the high-volume substitution of Portland cement, with 50 wt.% LF and up to 30 wt.% traditional SCMs, in semi-flowable concrete (SFC), evaluating properties of SFC. A slump of 200 mm was achieved, with retentions above 130 mm after 70 minutes for SFC mixtures. The 28-day compressive and flexural strengths of SFC exceeded 30 MPa and 3.2 MPa, respectively, meeting structural performance benchmarks (ACI 318, ASTM C94). LF replacement rate in binder exceeding 10% reduces strength of SFC due to LF’s lack of …

Exploring The Use Of Cattle Manure Digestate Ash For Partial Cement Replacement In The Production Of Concrete, Georges Fahd Khoury, Jessica Ensini, Francesca Ferretti, Enrico Sassoni, Marco Bovo, Claudio Mazzotti

C3 Symposium 2025

The paper investigates, through preliminary tests on mortar mixes, the possibility of substi-tuting a relevant percentage of cement with cattle manure ash for production of sustainable concretes.

Enhancing Ye’Elimite-Gypsum Hydration And Microstructure In Cementitious Systems Using Layered Double Hydroxides, Godwin I. Ogbuehi, Monday U. Okoronkwo

C3 Symposium 2025

This study evaluates the effect of nano-CaAlNO₃ layered double hydroxide (CAN LDH) on the early-age hydration of ye’elimite–gypsum systems. CAN LDH was synthesized via co-precipitation and added at 0%, 2%, and 5% dosages to ye’elimite–gypsum pastes. Isothermal calorimetry showed that LDH addition accelerated hydration, while XRD analysis confirmed increased ettringite formation, particularly at 5 wt%. The improvements are attributed to the LDH’s high surface area, ion release, and nucleation capabilities. Results suggest that CAN LDH enhances hydration kinetics and microstructure development, making it a promising additive for CSA-based low-carbon binders.

Advancing The Use Of Supplementary Cementitious Materials: A Novel Framework For Quantitative Reactivity Estimation, Bryan Aylas-Paredes, Rohan Bhat, Narayanan Neithalath, Aditya Kumar

C3 Symposium 2025

The partial replacement of Portland cement (PC) with supplementary cementitious materials (SCMs) presents an effective strategy to reduce CO2 emissions associated with cement production while preserving essential mechanical properties and durability. SCMs, such as fly ash, blast furnace slag, calcined clays, and other aluminosilicate-rich materials, enhance sustainability through their pozzolanic and hydraulic reactivity. Despite their significant potential, the widespread adoption of SCMs has been limited by the absence of straightforward and quantitative methods to assess their reactivity‒a crucial property influenced by chemical composition, amorphous content, and particle fineness. To overcome these challenges, this study proposes a novel, simplified quantitative method …

Waste Eggshell Valorization As Limestone Alternative For Portland Cement, Beng Wei Chong, Pratik Gujar, Xijun Shi, Prannoy Suraneni

C3 Symposium 2025

This study investigates and optimizes the heat treatment of eggshells to achieve performance comparable to that of limestone. Characterization of the eggshell powder revealed that it contained about 6% organic impurities by mass from the egg membrane. The effect of the organic content is not significant at 15% cement replacement. However, the influence of organic content imparted highly hydrophobic properties, which compromised paste flow, clinker hydration, and mortar strength at 35% cement replacement. Rheological measurement concluded that paste mixture with untreated eggshell powder displayed a higher static yield stress but lower dynamic yield stress. Moreover, mortars with untreated eggshell exhibited …

Study On Hydration Kinetics Of Geopolymer Synthesized With Recycled Concrete And Brick Powder, Tao Meng, Dawang Dai

C3 Symposium 2025

Concrete and brick waste accounted for the majority of construction and demolition waste. In recent years, the use of recycled concrete powder (CP) and recycled brick powder (CP) to prepare geopolymer binders gained significant attention. This study investigated the hydration characteristics of geopolymer made from BP and CP using isothermal calorimetry and low-field nuclear magnetic resonance (1H NMR) techniques. The results showed that the incorporation of BP or CP reduced the heat release during geopolymer hydration. The degree of hydration of the geopolymer binder initially decreased and then increased as the addition of BP or CP increased, while the nucleation …

Ca/Si-Dependent Size Of Silica Nanoparticles Derived From C-S-H At High Water To Solid Ratio, Binmeng Chen, Zongjin Li

C3 Symposium 2025

In recycling and reusing construction waste, carbonation of recycled concrete fine (RCF) has been successfully applied to produce value-added products, such as silica nanoparticles, via the breaking of calcium silicate hydrate (C-S-H) structure and condensation of silicate chains. However, the intricacies of carbonation of RCFs with varying calcium-silicon (C/S) ratios and their implications on the size of generated silica nanoparticles remains unknown. In this work, we developed an optimized carbonation method at high water to solid ratio to fabricate silica nanoparticles from C-S-H with different C/S ratios. The particle size of silica nanoparticles was found to gradually decrease with the …

Microstructure Evolution Of Alite In-Situ Carbonated By Aminated Mesoporous Silica Nanoparticles, Yuyang Zhao, Binmeng Chen

C3 Symposium 2025

Given that CO2 chamber and high inner pressure are needed in the traditional carbonation curing, we propose an in-situ internal carbonation by aminated mesoporous silica nanoparticles (MSNs) to tackle the challenge due to its high specific surface area. In this study, phase transformation and nucleation behavior were investigated by in-situ carbonation of alite paste with MSNs-amine absorbing CO2 (MSNs-amine-AC) and MSNs-amine desorbing CO2 (MSNs-amine-DC), separately. C-S-H with low Ca/Si ratio and negative electric potential is formed when MSNs-amine-DC is gradually eroded, wrapped and collapsed, converting to reaction sites chemically. On the contrary, ACC generated in MSNs-amine-AC blocks the mesopores, retard …

Molecular Dynamics And Machine Learning Approaches For Cementitious Material Design, Dongshuai Hou, Yue Zhang, Pan Wang, Muhan Wang, Xinpeng Wang

C3 Symposium 2025

The brittleness and cracking issues in concrete significantly compromise its structural safety and durability. This study combines molecular simulations and machine learning to address these challenges and enhance cementitious material performance. First-principles calculations, reactive force field, and classical molecular dynamics were employed to decode hydration mechanisms, mechanical properties, and interfacial behaviors, with the aid of a novel machine learning force field achieving near-DFT accuracy at reactive force field speeds. Concurrently, generative adversarial networks (GANs) were used to augment data for predicting concrete strength, enabling the development of high-accuracy machine learning models. These integrated approaches reveal fundamental mechanisms and establish predictive …

Application Of Nano Science And Nano Technology In Developing Advanced Cementitious Materials, Zongjin Li, Yunjian Li, Guoxing Sun, Binmeng Chen

C3 Symposium 2025

No abstract provided.

Dilemmas And Prospects Of Infectious Disease Prevention In Long-Term Care: A Qualitative Study, Po-Jen Kung, Ching-Min Chen, Nancy Reynolds

International Nursing Research Congress (INRC)

Aim: To explore the experiences of long-term care workers in preventing emerging infectious diseases, the challenges they faced during the pandemic, and how they were addressed.

Design: This study used an exploratory qualitative research design.

Methods: The study involved various long-term care institutions across Taiwan. Twelve interviewees, including four nurses, four nursing assistants, and four managers, were recruited via purposive sampling. All interviewees worked in the sector during the COVID-19 pandemic, were actively involved in clinical care or institutional management, and were proficient in Mandarin. In-depth interviews were conducted face-to-face between July and August 2024, and data …

Pandemic Prevention Competencies Of Long-Term Care Institution Workers: A National Survey In Taiwan, Po-Jen Kung, Ching-Min Chen, Katherine Ornstein

International Nursing Research Congress (INRC)

Aim: To assess the self-perceived pandemic prevention competencies of health and care workers in Taiwan’s long-term care institutions and identified key factors influencing these competencies.

Methods: A cross-sectional online survey was conducted from June to July 2024 using stratified proportional sampling of health and care workers (nursing and nursing assistants) from various types of long-term care institutions (assisted living facilities, residential care homes and nursing homes). Participants were actively employed during the survey, involved in COVID-19 prevention efforts, and proficient in reading traditional Chinese. Data on pandemic prevention competencies were collected, using the Emerging Infectious Disease Prevention Competencies …

Developing And Validating An Emerging Infectious Disease Prevention Competencies Scale, Po-Jen Kung, Ching-Min Chen

International Nursing Research Congress (INRC)

Aim: To develop an instrument and evaluate its psychometric properties for emerging infectious disease assessing prevention competencies among health and care workers in long-term care institutions.

Design: A cross-sectional, descriptive design utilizing both qualitative and quantitative methods was employed.

Methods: The scale was developed according to scale development guidelines in two phases, namely the scale development phase and scale testing phase, with the staff of long-term care institutions as the study population and their workplaces as the sampling unit.

Results: The scale comprises 27 items across three dimensions: 14 items pertaining to professional role performance, 7 items addressing workplace resources, …

Health And Care Workers’ Roles In Infectious Disease Prevention In Long-Term Care: A Scoping Review, Po-Jen Kung, Ching-Min Chen, Yi-Yuan Cheng

International Nursing Research Congress (INRC)

Aim: To describe how health and care workers contribute to the prevention of emerging infectious diseases in long-term care facilities.

Design: A scoping review.

Methods: A systematic search of literature dating from 2002 to 2022 was conducted in the following databases: EMBASE, Medline (Ovid), Cochrane Library, CINAHL Plus with Full Text (EBSCOhost), Web of Science, and AgeLine. Studies were selected if they focused on health and care workers in long-term care facilities, offered a perspective on the prevention of emerging infectious diseases or infection prevention and control, and were original qualitative or quantitative studies in English. Data were extracted, cross-checked …

2025 17th Annual Student Center For Science Engagement Research Symposium, Student Center For Science Engagement

Student Center for Science Engagement Research Symposium

Student presentations in Biology, Chemistry, Physics, Earth Science, Environmental Science, Computer Science, Mathematics, & Psychology

Automatic Generation Of A Labeled Corpus Of Conversational Failures During Interaction Between A User And A Conversational Ai Agent, Ilia Labzovsky, Danny Karmon

Defensive Publications Series

Current techniques to detect conversational failures during interaction between users and conversational artificial intelligence (AI) have many limitations - they capture only a tiny fraction of failures, lack context about the user's internal state during the conversation, and are not scalable. This disclosure describes techniques to automatically detect, classify, and log conversational failures in interactions between users and conversational AI agents to generate a rich, structured dataset. With user permission, conversations are analyzed to detect prosodic features and acoustic cues within context to determine likely occurrences of conversational failures. The conversational state is tracked using a state vector that encodes …

A Method And A System For Predicting E-Commerce Consumer Return Risks And Behavior Analysis, Ishika Ahuja, Hema Lakshmi K M, Kireeti Kesavamurthy, Bhuvanjeet Singh Gandhi

Defensive Publications Series

The present disclosure relates to a system and method for managing e-commerce return and refund risks by utilizing a comprehensive data aggregation module that collects information metrics from multiple e-commerce platforms using a unique identifier. The user's purchase profile is generated through a user profiling component leveraging Visa ID to link all active identification identifiers. A risk assessment engine computes various risk indicators based on historical purchasing behaviors, including sales-to-refund ratios and fraud signals. Furthermore, the system includes a dashboard interface that presents comparative metrics, allowing merchants to analyze consumer behavior against a broader consumer base. This structured approach facilitates …

Panel 6 - Tax Sovereignty Asserted And Practiced, David Duff, Jonathan Farrar, Lyne Latulippe, Nicolas Proulx, Jinyan Li

A. Cockfield Memorial Symposium

Chair: David Duff (University of British Columbia)

Jonathan Farrar (Wilfrid Laurier University), Mapping Public Attitudes Toward Taxation: A Cross-National Study of Fiscal Citizenship

Lyne Latulippe (Université de Sherbrooke) and Nicolas Proulx, (Members of Parliament in Development and Adoption of International Tax Policy), Implementation of International Tax Policy by the Canadian Parliament – The case of the MLI

Jinyan Li (Osgoode Hall Law School) and Angelo Nikolakakis (EY), Shrinking Tax Sovereignty in Canada? Evidence from the Income Tax Act

Commentators: Sophie Chatel (MP); Shawn Porter (Deloitte)

The Student Movement Volume 110 Issue 2: Week Of Prayer, Politics, And Purpose, Kara Shepard, Megan Constantine, Corinna Bevier, Melanie Webb, Joey Carrion, Isa Demoraes, Timi Olatunde, Aiko J. Ayala Rios, Ayanda Dewa, Nicoleta Cojan, Madison Vath

The Student Movement V. 110 (2025-2026)

HUMANS

What the Constitution Means to Me, Kara Shepard

Where Passion Meets Purpose: Senior Natalie Reid Reflects on Her College Years, Megan Constantine

ARTS & ENTERTAINMENT

Art Around the City, Corinna Bevier

The Saxophone Reimagined: Cerus Quartet at HPAC, Melanie Webb

The TV Shows That Taught Me Spanish, Corinna Bevier

NEWS

TikTok Survives: Trump Administration Announces Deal to Save the Platform, Joey Carrion

Students Experience "Real Life, real God" at Week of Prayer, Isa DeMoraes

IDEAS

Being Adventist in the 21st Century, Timi Olatunde

Question of the Week #2, Aiko J. Ayala Rios

The Great Spanish Surge, Ayanda Dewa

PULSE …

Feasibility Of Helium And Nitrogen As Surrogate Gases For Hydrogen Jet Using Planar Laser-Induced Fluorescence In A Constant Volume Chamber, Jungho Justin Kim, Seong Young Lee, Youngmin Ki, Joonsik Hwang, Choongsik Bae

Michigan Tech Publications

This study investigates the feasibility of using helium and nitrogen as surrogate gases for visualizing the non-reactive behavior of hydrogen jets in a constant volume chamber. Hydrogen, helium, and nitrogen were individually mixed with acetone vapor and injected using a hollow-cone injector. The fuel distribution was visualized using Planar Laser-Induced Fluorescence (PLIF), while simultaneous Schlieren imaging was employed to capture overall jet structures. Quantitative comparisons of jet areas extracted from both imaging techniques demonstrated that acetone effectively followed the gas-phase flow of each species, validating its use as a flow tracer. Furthermore, helium and nitrogen exhibited jet dispersion patterns comparable …

The Calvin University Math Department History 1920-2020, Michael Stob

University Histories

No abstract provided.

Engineering, Innovation, And God’S Creation, Fred Haan

University Faculty Publications and Creative Works

Took place at YPPH Annual Retreat 2025 Coram Deo In the Presence of God Reflections on Biblical Christian Worldview at Pelita Harapan University on 9/26/2025 in Jakarta, Indonesia.

Beyond Opacity: Distributed Ledger Technology As A Catalyst For Carbon Credit Market Integrity, Stanton Heister, Felix Kin Peng Hui, David Ian Wilson, Yaakov Anker

Business Faculty Publications and Presentations

The 2015 Paris Agreement paved the way for the carbon trade economy, which has since evolved but has not attained a substantial magnitude. While carbon credit exchange is a critical mechanism for achieving global climate targets, it faces persistent challenges related to transparency, double-counting, and verification. This paper examines how Distributed Ledger Technology (DLT) can address these limitations by providing immutable transaction records, automated verification through digitally encoded smart contracts, and increased market efficiency. To assess DLT’s strategic potential for leveraging the carbon markets and, more explicitly, whether its implementation can reduce transaction costs and enhance market integrity, three alternative …

The Effect Of Mesoscale Frontal Waves On Landfalling Atmospheric Rivers And Their Associated Precipitation Over The Green River Watershed, Washington, Joseph Michael Riedl

Dissertations and Theses

In this study, the effect of mesoscale frontal waves (MFWs) on extreme precipitation (EP) in the Upper Green River Watershed (UGRW), Washington is investigated. 205 EP days (>95th percentile) are identified in the UGRW between the years 1980 and 2021. To characterize the range of large-scale meteorological conditions associated with EP days, the self-organizing map (SOM) approach is used to cluster daily integrated water vapor transport (IVT) on EP days. To further diagnose the meteorological drivers, composites of several other diagnostic fields are constructed for each SOM node and the preceding days. Together, these results illustrate common orientations of …

Wmu Maritime Affairs Conference 2025 : Transforming A Maritime Future : Digitalization And Decarbonization, World Maritime University

Books

No abstract provided.

Energy Statistic-Based Goodness-Of-Fit Test For The Lindley Distribution With Application To Lifetime Data, Joseph Njuki, Ryan Avallone

Mathematics and Statistics

In this article, we propose a goodness-of-fit test for a one-parameter Lindley distribution based on energy statistics. The Lindley distribution has been widely used in reliability studies and survival analysis, especially in applied sciences. The proposed test procedure is simple and more powerful against general alternatives. Under different settings, Monte Carlo simulations show that the proposed test is able to be well controlled for any given nominal levels. In terms of power, the proposed test outperforms other existing similar methods in different settings. We then apply the proposed test to real-life datasets to demonstrate its competitiveness and usefulness.

This article …

September 26, 2025 Ereporter, University Of Alabama At Birmingham

eReporter (campus newsletter)

No abstract provided.

Fungal Palynomorphs From The Lower Cretaceous (Berriasian–Albian) Of Jangareddygudem Area Of The Chintalapudi Subbasin, Andhra Pradesh, South Part Of India, Harinam Joshi, Neerja Jha, Sarah Gonçalves Duarte, Sari̇ye Duygu Durak, Haytham Elatfy

Turkish Journal of Earth Sciences

A diverse array of thalli, fruiting bodies, spores, and other fungal structures has been observed in palynological samples collected from the sedimentary sequence MJR-11, drilled in the Jangareddygudem area of the Chintalapudi subbasin, Andhra Pradesh, southern India. The sedimentary sequence is dated to the Kimmeridgian–early Albian, based on palynology. However, the focus of the present work is on the Early Cretaceous (Berriasian–early Albian). A well-developed and diverse fungal assemblage consistently occurred throughout most of the succession, together with predominant conifer pollen grains and highly diversified pteridophytic and bryophytic spores. Furthermore, the recorded palynomorphs suggest deposition under both continental and marine …

Fault Morphology Along A Sinistral Active Fault Near A Continental Triple Junction: The Ilıca Segment At The Northern Termination Of The East Anatolian Fault Zone, Türkiye, Aynur Di̇kbaş, Hani̇fe Merve Önal

Turkish Journal of Earth Sciences

The East Anatolian fault zone (EAFZ) is an approximately 430 km long sinistral transform fault that bounds the southwestern margin of the Anatolian microplate between Karlıova (Bingöl) and Kahramanmaraş. It constitutes part of the Karlıova triple junction (KTJ) in eastern Anatolia. Near the KTJ, the Ilıca and Karlıova segments delineate the EAFZ. The Ilıca segment, approximately 38 km long, exhibits distinct fault-related geological structures, including linear valleys, elongated ridges, saddles, sag ponds, shutter ridges, thermal springs, and travertines. Based on extensive mapping using high-resolution imagery and field investigations, the Ilıca segment has been categorized into three sections: section 1 and …

First Insights Into The Origin Of Iron In Eastern Cilicia During The Iron Age, Using Osmium Isotope And Trace Element Analysis, Ivan Stepanov, Hüseyi̇n Öztürk, Michael Brauns, Ernst Pernicka, Nurullah Hanilçi, Ümi̇t Güder

Turkish Journal of Earth Sciences

Due to the abundance of ore resources and the probable technological advances of the Hittite civilisation, the Anatolian plateau is conventionally regarded as “the birthplace” of iron smelting technology. The present paper presents a complex archaeometric investigation of iron production remains from the Middle and Late Iron Age phases (c. 750–575 BC) at Kinet Höyük, a major trading port on the coast of eastern Cilicia (modern-day Dörtyol, Hatay). To provide an initial insight into the sources of iron processed at Kinet Höyük and to generate an overview of the 187Os/188Os and 187Re/188Os isotope ratios expected from eastern Anatolian iron ores, …