North Carolina Agricultural and Technical State University
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Heat Transfer Enhancement Using Triply Periodic Minimal Surface Inserts in A Square Duct
No full textThis study explores the thermal performance of three Triply Periodic Minimal Surfaces (TPMS) within a square duct: Gyroid, Helix Spiral, and Twisted Wave. The duct features a constant heat flux applied to opposite sides, with one end insulated, and fluid flows through the longitudinal section at a Reynolds number (Re) of 845,000. The primary focus is on evaluating the heat transfer enhancement and thermal performance factor (TPF). The heat acquired by the fluid (Q ratio) and the TPF were measured to assess the effectiveness of each surface in improving thermal performance. Results indicate that the Helix Spiral (TPF:0.77, Q ratio: 5.76) configuration achieved the highest heat transfer enhancement, followed by Gyroid (TPF: 0.75, Q ratio: 4.59) and Twisted Wave (TPF: 0.72, Q ratio: 3.9) . These findings highlight the potential of TPMS structures in optimizing thermal management systems, with the Helix Spiral emerging as the most effective design for heat transfer applications. This research provides valuable insights into the thermal performance of various TPMS geometries, offering a foundation for future advancements in heat exchanger design.https://digital.library.ncat.edu/gradresearchsymposium25/1124/thumbnail.jp
Impact of Collaborative Food Rescue Initiatives on Food Waste Reduction
No full textIn the current food systems landscape, the concept of food rescue has become a powerful force due to concerns about waste and its effects on the environment and society. This paper explores the collaborative efforts of various stakeholders, such as retail donors, food banks, for-profit organizations, and waste management entities, in addressing the complex challenges of food security, sustainability, and waste reduction. Through a comprehensive framework, surplus food is rescued from various stages of the supply chain and redirected towards meaningful purposes, mitigating the environmental impact of food waste. However, despite these efforts, the global paradox of food waste alongside increasing food insecurity continues to exist. This study examines the dynamics of how food is allocated among stakeholders through Monte Carlo simulation in order to identify disparities and optimize the use of resources. By addressing disparities and improving collaboration, the paper aims to enhance the efficiency and sustainability of food rescue initiatives, ultimately reducing food waste and improving societal well-being. Key research questions explore the impact of for- profit food rescue on non-profit organizations. The Monte Carlo simulation results show that competition between food banks and for-profit organizations significantly reduces food waste, with for-profits acting as a crucial buffer to absorb surplus supply.https://digital.library.ncat.edu/gradresearchsymposium25/1141/thumbnail.jp
Neutrophil Extracellular Traps Sensing Activates Directional Migration of Brain Metastatic Breast Tumors
No full textBrain metastases (BrM) in breast cancer are associated with poor survival, and neutrophil extracellular traps (NETs) have emerged as key drivers of tumor migration and invasion. This study explores how BrM cells sense and respond to NETs via CCDC25, a membrane-localized extracellular DNA sensor. Using a polyacrylamide-based hydrogel co-culture system, we spatially segregated tumor cells and neutrophils while preserving their biochemical interactions. Our findings reveal that CCDC25 expression is significantly upregulated in BrM cells in response to NETs, leading to enhanced tumor invasion. Notably, tumor migration was directly proportional to NET density, with cells aligning toward NET-rich regions, particularly when collagen was introduced to facilitate migration. Additionally, BrM tumors appear to reprogram neutrophils to generate NETs in the surrounding stroma, reinforcing a pro-metastatic microenvironment. The study suggests that NET-stroma interactions serve as key regulators of BrM tumor dynamics, promoting directional migration and invasion. These insights provide a mechanistic understanding of how NET sensing facilitates BrM progression, highlighting CCDC25-NET interactions as potential therapeutic targets for metastatic breast cancerhttps://digital.library.ncat.edu/gradresearchsymposium25/1150/thumbnail.jp
Automated Vulnerability and Resilience Analysis of Power Grids under Attacks (And Digital Twins)
No full textThe increasing complexity of smart grids has made them susceptible to failures caused by both natural events and targeted attacks. This study presents an automated vulnerability and resilience analysis framework for power grids using digital twins. Our research focuses on identifying critical nodes whose failure could significantly impact grid performance. By leveraging complex network analysis and centrality measures, we assess the effects of various attack strategies on power grids. We enhance GridLab-D simulations with real-time monitoring using currdump and voltdump, develop Python libraries for Monte Carlo simulations, and quantify power losses using FOE, SOC, and SOLC metrics. Our approach integrates graph-theoretic techniques to construct adjacency matrices, enabling the computation of betweenness and eigenvector centrality. These metrics help identify the most vulnerable components in the network. Using Glimpse, we enhance network visualization, allowing for a more intuitive understanding of grid topology. Preliminary results from the IEEE-123 test network highlight the cascading failures caused by node and load-based attacks. By systematically analyzing power flow disruptions, we propose a Vulnerability Predictive Measure (VPM) to enhance predictive capabilities in power grid resilience assessments. Future work includes running 10,000 Monte Carlo simulations to refine our centrality-based vulnerability model and develop optimized grid protection strategies.https://digital.library.ncat.edu/gradresearchsymposium25/1164/thumbnail.jp
New Farmers of America Association
No full textA group of men observing pigs in a field.https://digital.library.ncat.edu/photos/2094/thumbnail.jp
New Farmers of America Association
No full textPhoto of group on the beach. Attached labeled Ocean Front\u27.https://digital.library.ncat.edu/photos/2124/thumbnail.jp
New Farmers of America Association
No full textYoung woman standing next to shelves of canned goods.https://digital.library.ncat.edu/photos/1875/thumbnail.jp
New Farmers of America Association
No full textMelons and corn.https://digital.library.ncat.edu/photos/1877/thumbnail.jp
New Farmers of America Association
No full textLee Allen Yates from the Brick Chapter of New Farmers of America in Brick, North Carolina, shows his Pictorial Exhibit of a Supervised Occupational Experience Program to his advisor.https://digital.library.ncat.edu/photos/1882/thumbnail.jp
New Farmers of America Association
No full textBoys constructing building. Signed \u27J. A. T. Brown Snowden.\u27https://digital.library.ncat.edu/photos/2054/thumbnail.jp