Engineering Commons^™

Characteristics Of Dynamic Mode Ⅱ Fracture Of Frozen Saturated Sandstones Under Varying Low Temperatures And Loading Rates, Zhao Tao, Cui Zhao, Jia Hailiang, Yang Guangyu

Coal Geology & Exploration

Background Investigating the mode Ⅱ fracture of frozen saturated sandstones under dynamic disturbances, including changes in their critical stress intensity factor (SIF; i.e., fracture toughness) and energy dissipation mechanisms, is crucial for the safe excavation of frozen wellbores through drilling and blasting in coal mines. Methods Using a split Hopkinson pressure bar (SHPB), this study conducted experiments on the dynamic mode Ⅱ fracture of a sandstone specimen using the short core in compression (SCC) method (also referred to as dynamic SCC experiments) under varying temperatures and loading rates. Accordingly, this study analyzed the SIF versus time curves of the frozen …

An Experimental Study On The Yield Strength Of Cement Grout For Grouting In The Limestone Area Of A Coal Seam Floor, Zou Jun, Guo Yan, Gui Herong, Wang Weimin, Chen Zhenlin, Liu Faming, Dai Yanan, Hu Yang, Chen Zengbao, Li Jun, Gao Chuan, Li Heng

Coal Geology & Exploration

Objective and Methods In recent years, regional grouting through ground directional drilling has become the preferred technique for water disaster prevention and control in floor limestones in a coal mining area. In grouting engineering, the diffusion radius of cement grout, which has always received wide attention, is constrained by multiple factors including the shear yield strength (yield strength for short) and specific gravity of cement grout, along with grouting pressure. The diffusion radius in turn influences the implementation effects of on-site grouting engineering. Among its controlling factors, the yield strength of cement grout cannot be tested on site. Given this, …

Critical Technical Parameters Of Large-Diameter Multi-Stage Casing Drilling For Mine Rescue, Xu Chao, Yao Ningping, Jiang Lei, Tian Hongjie, Liu Zhi, Zhu Ning

Coal Geology & Exploration

Objective This study aims to meet the needs of mine rescue in cave-in accidents occurring in narrow underground spaces and to address the contradiction between equipment miniaturization and the drilling of large-diameter rescue boreholes under complex collapse conditions. Based on the goal of constructing a 60-m-long rescue passageway, this study developed a dual-power, composite drilling process based on multi-stage casing drilling technology for large-diameter horizontal rescue boreholes under complex collapse conditions. Furthermore, this study investigated the critical drilling parameters, aiming to provide a basis for the function development and parameter formulation of rescue equipment. Methods This study designed supporting three-stage …

Application Of Five Seismic Attributes In Natural Fracture Prediction For Deep Coalbed Methane Production Along The Eastern Margin Of The Ordos Basin, Tong Jiangnan, Wang Feng, Zhang Feng, Hou Wei, Li Zhongbai, Ji Liang, Jiang Yanan, Sun Wei

Coal Geology & Exploration

Background Natural fractures serve as both the primary storage space for free gas of deep coalbed methane (CBM) and pathways for hydrocarbon migration. Furthermore, these fractures can enhance the porosity and permeability of strata under the deep, high-pressure condition, significantly amplifying the permeability of coal seams. Therefore, the fine-scale characterization of the planar distribution of natural fractures is crucial to deep CBM production.Objectives and Methods This study investigated the No.8 coal seam in the Carboniferous Benxi Formation within the Daning-Jixian block on the eastern margin of the Ordos Basin. Through offset vector tiles (OVT) domain processing of offshore 3D …

Optimizing Hydrogel Performance Composed Of Japanese Pagoda Tree Extract Loaded-Gelatin-Sodium Alginate-Polyethylene Oxide For Biomedical Applications: Influence Incorporated Calcium-Based Metal Organic Frameworks And Zinc Oxide Nps, Samar A. Salim

Nanotechnology Research Centre

Gelatin/sodium alginate/polyethylene oxide hydrogel was synthesized by self-gelation method and utilized to achieve enhanced mechanical strength. Japanese pagoda, tree extracts rich in flavonoids and isoflavonoids was incorporated to enhance tissue repair along with ZnO-NPs to provide the hydrogel with necessary antimicrobial and other desirable biological properties. The inclusion of Ca-BDC MOF enhanced hydrogel matrix by providing more surface area and the presence of calcium ion needed for tissue regeneration. Results revealed that composite hydrogel displayed suitable gelation time and swelling rate that was further improved by incorporating the plant extract, ZnO-NPs, and Ca-BDC MOF. The efficacy of the tested formulations …

Asymmetric Effects Of The Ebbinghaus Illusion On Relative Depth Judgments In A Perceptual Matching Task, Caden J. Thompson

Honors Theses

The Ebbinghaus illusion, also know as Titchner Circles, is a perceptual illusion that is typically presented as a two-dimensional set of disks. These disks are configured as a central disk surrounded by an annulus of smaller or larger disks. Numerous studies have found the illusion to have an effect on size perception, but fewer studies have analyzed its effects on depth judgments. This study utilized a head-worn virtual reality environment as well as a three-dimensional display to examine the effects of the Ebbinghaus illusion on relative depth judgments in a perceptual matching task. Findings indicated that Ebbinghaus configurations featuring an …

Fracture Initiation Pressure As A Measure Of Cemented Paste Backfill Strength, James A. Frimpong, Basel Ahmad Shabab, Rohit Pandey, Snehamoy Chatterjee, Gabriel Walton, Alexander S. Brand

Michigan Tech Publications

This laboratory-scale study presents the development and validation of a hydraulic fracturing technique to directly measure the tensile strength of cemented paste backfill (CPB), providing an alternative to traditional strength testing methods. Fracture initiation pressure (FIP) was used as the primary measure of CPB strength. Experimental results were compared with traditional benchmark measures such as uniaxial compressive strength (UCS), Brazilian tensile strength (BTS), and critical Mode-I fracture toughness (KIc). Regression analysis of experimental results revealed a strong linear relationship between FIP and these benchmark strength measures, indicating that FIP can be used as a reliable predictor of CPB strength. However, …

Mobile Robots And Autonomous Vehicle Control: A Comprehensive Review Of The Advancements And Challenges, Elvis Tamakloe, Benjamin Kommey, Ernest Ofosu Addo, Daniel Opoku

Makara Journal of Technology

Since their inception, mobile robots have enormously changed the landscape of robotics engineering in recent years. Imperatively, the impact of mobile robots has positively transformed many sectors of human endeavors, i.e., complemented and substituted humans in areas where human interactions were difficult, hazardous, and impossible to thrive and operate. In this regard, the contributions of mobile robots to scientific, social, and economic growth, development, and advancement cannot be overlooked, especially through its decades of transition from Industry 3.0 to 4.0 over the years. To achieve maximum benefits from the use of mobile robots across all important facets, their advancements and …

Providing A Solution For Active-Duty Servicewomen Facing Chronic Musculoskeletal Injuries Due To Improper Gear Fit, Celia Watson, Denver Tidwell, Hadi Obaji

Honors Theses

As senior biomedical engineering students at the University of Mississippi, we began our academic year brainstorming unmet clinical needs in healthcare intending to provide an innovative solution. After conducting personal inventories, determining a mission, and evaluating internal and external factors, we established acceptance criteria for our strategic focus and clarified our needs statement: develop a prophylactic device for chronic musculoskeletal injuries (MSKIs) in active-duty servicewomen (ADSW). The average female soldier is at a disadvantage compared to her male counterpart due to anthropometric and physiological differences between men and women in most aspects of physical performance (Epstein et al. 2673). These …

A Study Of The Parameters Involved In Nir Sintering Of Silver Microparticle-Based, Pad-Printed Features, Jonah Clement Brooks

Theses and Dissertations

This study explores the effectiveness of pad printing and near-infrared (NIR) sintering for producing conductive silver microparticle traces. A new pad printer was set up, and silver inks with varying concentrations of silver particles (17.5 %v/v, 20 %v/v, and 25 %v/v) were manufactured, printed, and sintered. The study identified sintering time and silver concentration as the most influential parameters affecting resistivity, with the best result of 8.73 × 10⁻⁷ Ω·m achieved using 25 %v/v ink sintered for 3 seconds at full power. Although resistivity continued to decrease at this maximum sintering duration, further optimization of parameters, including NIR bulb distance …

Mechanism Of Property Enhancement Of Cu−Ti Alloys Via Microalloying With Cr And Mg Elements, Huan Wei, Hong Wei, Hua-Yun Du, Qian Wang, Cai-Zhi Zhou, Ying-Hui Weu, Li-Feng Hou

Faculty Publications

The effect of adding Cr and Mg on the microstructure and properties of Cu−Ti alloys was examined. Cu−Ti−Cr−Mg alloys were fabricated using vacuum induction melting. The microstructure and phase composition of Cu−Ti−Cr−Mg alloys in different aging states were characterized. Additionally, the hardness and electrical conductivity of the materials were investigated. Results show that the precipitation pattern in Cu−Ti−Cr−Mg alloys resembled that of binary Cu−Ti alloys, with Cr and Ti forming the intermetallic compound of Cr2Ti during casting. The introduction of Cr and Mg increased the hardness of the alloy. Increasing the Mg content in the Cu−Ti−Cr−Mg alloy led to grain …

Designing And Implementing A Classification Model For Mangoes Based On Size And Ripeness Using Image Processing, An Van Vo, Hau Van Mai, Hung Duy Ha, Tam Thanh Bui

Makara Journal of Technology

Image processing is an advanced technology that significantly supports production, identification, and quality control for fruits. This paper uses image processing techniques to develop a mango classification system based on size and ripeness. The system integrates hardware, including an Arduino microcontroller, camera, sensors, actuators, and a user-friendly computer interface for monitoring and control. The classification algorithm extracts key features of the mangoes, such as their color and shape, to categorize them into predefined quality classes. Experimental results demonstrate that the system achieves an accuracy exceeding 90% for both ripeness and size classification, with a productivity level of 300 kg/hour, surpassing …

Capturing Interfacial Phase Change And Flow Physics During Vertical Downflow Condensation, Thanh Hoang Phan, Cho Ning Huang, Chirag R. Kharangate

Faculty Scholarship

Two-phase configurations can address the urgent demand for effective heat dissipation solutions in Naval power and energy systems. A better understanding of thermal transport processes in phase-change flows is critical for developing novel two-phase design tools for naval scientists and engineers. This study investigates interfacial phase change and flow dynamics during condensation flow through numerical simulations. An enhanced phase change model, incorporating a mass transfer intensity coefficient dependent on condensation film thickness, is implemented for vertical downflow condensation. A two-dimensional homogeneous two-phase Reynolds-Averaged Navier-Stokes model, coupled with the Shear-Stress Transport k-ω turbulence model, is employed. The developed solver is thoroughly …

Small-Scale Production Of Bespoke Accelerated Aging Plutonium Alloy, K. S. Holliday, A. M. Parkes, Devin Rappleye, D. J. Roberts, K. J. Kondrat, S. A. Simpson, A. J. Swift, U. Mehta, R. M. Kissinger, D. L. Rosas, L. S. Ripplinger, E. R. Tardiff, S. L. Harris, S. Perkins, C. Hawkins, N. J. Gibbs, R. J. P. Driscoll, A. T. Sidambe, R. A. Cole, T. T. Roehling, J R. Jeffries

Faculty Publications

This study demonstrates the 100 g scale manufacture of a plutonium alloy that ages at an accelerated rate. The resulting alloy ages six times faster than typical weapons-grade plutonium due to the addition of ²³⁸Pu. As a major innovation, the process involved using a partial direct oxide reduction technique. This method was achieved by developing a new, complex geometry stirrer using additive manufacturing to reduce the ²³⁸Pu oxide and efficiently incorporate it into weapons-grade plutonium metal. The material was then purified by molten salt extraction and electrorefining before being alloyed with gallium. The alloy was then cold-rolled and …

Performance Of Quasi-Isotropic Gf/Pet Laminates In Impact And Compression After Impact Loading, Yubo Ma, Shuoyan Niu

Research & Creative Achievement Day

The impact resistance and residual compression strength of two types of glass fiber/ polyethylene terephthalate composites are investigated in this research project. The first materials are glass fiber/ polyethylene terephthalate glycol (GF/PRTG) and the second material is glass fiber/ amorphous polyethylene terephthalate (GF/PETa). Both matrix materials are ductile thermoplastic polymers. The ductility of the matrix is expected to improve the impact resistance of the composites. The advantage of the first material is higher ductility and improved fire resistance, and the advantage of the second material is high bonding strength with the reinforcing fiber glass. Both matrixes and low cost engineered …

Panel Impact And Compressing Strength Testing, Michael A. Dietz, Wyatt N. Laborde

Research & Creative Achievement Day

Intro/Purpose: This project was conducted to investigate how a material's compressive strength is affected after being impacted while supported on three sides. This has broader implications, helping us understand how military equipment, such as battleships, have their compressive strength affected when impacted by projectiles like bullets, shrapnel, or other objects.

Methodology: This test was conducted using panels made of multiple layers of fiberglass pressed together to form a solid sheet. We then cut these sheets into multiple panels. These panels were rectangular, with a tab coming off three sides. The three tabs simulated a wall supporting the material …

Durafold Premium: Composite Folding Table, Regan G. Harvey, Hendrik J. Welti, Parker D. Buth, Stadler J. Lucas, Grace Eischens

Research & Creative Achievement Day

Current folding table designs are made to be lightweight, but the table surface made of high density polyethylene (HDPE) can break and is not repairable. Our team designed the DuraFold Premium as an alternative to the traditional folding tables. The table surface and legs use a sandwich construction consisting of top and bottom face sheets made with carbon and glass reinforcing fibers in an epoxy resin system. In between the two face sheets is a honeycomb core material. This approach results in the DuraFold Premium being extremely durable while remaining lightweight. Over the past academic year, our team has been …

Carbon Club Carrier: A Lightweight Motorized Golf Pushcart, Tanner J. Conniff, Eric M. Courneya, Alex Hilo, Max R. Kauphusman, Luis M. Rodriguez

Research & Creative Achievement Day

The Carbon Club Carrier is a lightweight, motorized golf pushcart designed to enhance convenience and ease of use for golfers. Traditional golf push carts can be cumbersome and require significant effort to maneuver across varying terrain. Our design integrates a carbon fiber frame for durability and weight reduction, coupled with an electric push-assist motor to reduce strain on the user. The use of carbon fiber composite materials ensures a strong yet lightweight structure, optimizing portability and performance. The push-assist motor system is designed to provide variable-speed assistance, allowing golfers to move their clubs effortlessly across the course. The carrier is …

Sustainable Desalination: Carbon Capture From Reject Brine Using Uae Date Palm Leaf, Haneen Ahmed Abu Saifan

Thesis/ Dissertation Defenses

The United Arab Emirates faces significant challenges in managing reject brine from desalination processes. Additionally, the energy-intensive nature of desalination contributes to greenhouse gas emissions, particularly carbon dioxide (CO2). This study explores the potential of date palm leaf ash, an underutilized agricultural waste, as a sustainable material for brine desalination and CO2 capture. Date palm leaves were converted into ash through incineration at 550°C and 750°C, followed by chemical activation using potassium hydroxide. The study evaluated the ash's efficiency in removing key ions (Na+, Mg2+, Ca2+, K+) from reject brine and capturing CO2, while optimizing process conditions using response surface …

A Novel Fixture Development To Characterize Compression After Impact Damage Of Unidirectional Thermoplastic Composite Laminates, Matt K. Ficker, Dominic L. Perez, Noah Misukanis, Luke E. Poglayen, Jacob Kosmoski

Research & Creative Achievement Day

Impact testing of unidirectional thermoplastic composite materials is a challenge due to the Mode I shear of the primary tows on the impact side. Thermoplastic composite products manufactured using laminate stacking are bonded together with films of polymer on both sides of oriented fiber in typically a cross-ply or quasi-isotropic stack. The resulting failure from the distortion field imposed by a hemispherical tup is debonding along the interface between layer 1 and layer 2 oriented in the layer 1 direction from impact site to edge of panel. This failure mode results when the sample is too small relative to the …

Assessing The Impact Of Internal Flow Dynamics On Detection Region Concentrations Of Low-Cost Optical Particle Counters, Livingstone Quarshie

Theses and Dissertations

Particulate matter (PM) poses significant risks to human health and the environment, making accurate measurement essential for exposure assessment and regulatory decisions. While traditional reference methods provide reliable data, they are often bulky, expensive, and difficult to maintain. Optical Particle Counters (OPCs) offer a cost-effective alternative, commonly used in clean rooms, residential spaces, and personal exposure monitoring. These devices rely on light scattering to measure PM concentrations. However, low cost OPCs face challenges related to calibration and measurement accuracy, requiring careful performance evaluation. This study used computational fluid dynamics (CFD) tools, CONVERGE Studio and ANSYS Fluent, to simulate a simplified …

Investigating The Role Of Blood Models In Predicting Rupture Status Of Intracranial Aneurysms, Zonghan Lyu, Mostafa Rezaeitaleshmahalleh, Nan Mu, Jingfeng Jiang

Michigan Tech Publications

Purpose. Selecting patients with high-risk intracranial aneurysms (IAs) is of clinical importance. Recent work in machine learning-based (ML) predictive modeling has demonstrated that lesion-specific hemodynamics within IAs can be combined with other information to provide critical insights for assessing rupture risk. However, how the adoption of blood rheology models (i.e., Newtonian and Non-Newtonian blood models) may influence ML-based predictive modeling of IA rupture risk has not been investigated.Methods and Materials.In this study, we conducted transient CFD simulations using Newtonian and non-Newtonian rheology (Carreau-Yasuda [CY]) models on a large cohort of 'patient-specific' IA geometries (>100) under pulsatile flow conditions to …

Evaluation Of Chloride Diffusion In Concrete Using Bulk Diffusion Test And Scanning Electron Microscopy, Payton Davis

Doctoral Dissertations and Master's Theses

Reinforced concrete is one of the most widely used construction materials in the world with many bridges and other major infrastructure consisting of such structural elements. A primary concern impacting the durability of concrete is chloride penetration in aggressive environments such as marine or coastal areas. In such environments, chloride ions can penetrate into the pores of concrete leading to the corrosion of embedded steel reinforcement which compromises the structural integrity of concrete. To investigate the issue, a comprehensive experimental program was designed and implemented which involved the preparation and testing of 31 different concrete mixes, each incorporating varying proportions …

Utilizing Augmented Reality For Immersive Space Mission Design, Joseph Anderson

Doctoral Dissertations and Master's Theses

Designing spacecraft mission trajectories is a complex, tedious, and stringent process that requires a strong background in astrodynamics and programming due to the complex dynamical environment of space. The current 2D visualization methods for displaying these geometrically abstract trajectories make it difficult to understand the true nature of more complex orbits. Advancements in immersive headsets and their intuitive interaction capabilities make them ideal for solving and understanding 3D problems that require complex spatial representations, revealing an innovative and unique opportunity for the astrodynamics and space mission planning field. This effort covers the development of an immersive space mission design tool …

Usb-Powered Virtual Cyber Labs: A Plug-And-Play Solution For Cybersecurity Education, Danny Galvis, Keith Fernandez, David Abiandu

Center for Cybersecurity

No abstract provided.

Rfid Tag For Continuous User Verification, Christian Zambrano

Center for Cybersecurity

RFID Tag for Continuous User Verification — Kean University Research Days

Machine Learning Techniques For Detecting Distributed Denial Of Service (Ddos) Attacks, Caesar Marte

Center for Cybersecurity

Machine Learning Techniques for Detecting Distributed Denial of Service (DDoS) Attacks — Kean University Research Days

Comparative Analysis Of Operating System Security: Evaluating The Most Secure Os, Rodrigo Gonzalez

Center for Cybersecurity

https://www.keanresearchdays.com/student-poster-presentation-2025-feed/comparative-analysis-of-operating-system-security-evaluating-the-most-secure-os

Examination Of A Bench-Scale Model For Post-Wildfire Flood And Water Quality Mitigation Solutions, Cheyenne Ethridge

Honors Theses

The objective of this study is to determine a potential low-cost, sustainable, and rapidly deployable solution for post-wildfire flood and water quality mitigation in communities reliant on surface water for drinking water. Coalinga, Fresno County, California was selected as a study area for a full-scale solution due to its high risk of wildfires, high social vulnerability, and relatively low community resilience. A bench-scale demonstration of the system directs water into a gravel infiltration zone surrounded by a weir perimeter and followed by a clarifier. Because of their abundance in the area, almond shells were explored as a coagulant additive to …

In-Situ Void Formation During Liquid Composite Molding For Preformed Warp, Weft, And Alternating Orientation Rtm Samples, Tanner Cal Garrett

Theses and Dissertations

Carbon fiber reinforced parts are utilized by the transportation industry due to being strong yet lightweight. The highest quality parts are made using carbon fiber (CF) pre-impregnated with resin processed in an autoclave to reduce void content. The autoclave process is expensive and takes up a large amount of space, so liquid composite molding (LCM) is a less expensive alternative. The parts produced using LCM can be manufactured to rival the mechanical performance of parts made with pre-preg in an autoclave, but concerns remain over voids. Most research pertaining to void formation has been done ex-situ by either micro-CT or …