Engineering Commons^™

Energy, Exergy, Economic, And Environmental Analyses (4e) Of Geothermal Power Plant With Double Flash System For Power And Heat Production, Mamdouh El Haj Assad, Yashar Aryanfar, Imen Ben Salem, Shek Atiqure Rahman, Laveet Kumar, Ahmad K. Sleiti, Mohammad Alhuyi Nazri

All Works

Geothermal energy is a reliable and sustainable renewable energy source due to its continuous availability and eliminating the need for energy storage systems. Among various types of geothermal power plants, double flash (DF) geothermal plants are among the most widely utilized. This paper presents a comprehensive thermodynamic analysis of a DF geothermal power plant, integrating energy, exergy, economic, and exergoenvironmental (4E) evaluations. The study examines the influence of key parameters, including the high-pressure separator and geothermal production well temperature, on the system performance. The results indicate that the expansion valve of the high pressure separator exhibits the highest exergy destruction …

Green Project Finance For Infrastructure And Building Construction: Instruments And Benchmarks, Yunping Liang

Durham School of Architectural Engineering and Construction: Faculty Publications

It is counterintuitive that both the practice and research on green project finance for infrastructure and building construction are ascendant and still have limited precedents, considering that individually, the two parts (i.e., project finance and sustainability in the built environment) are both familiar to the communities. To narrow the gap and facilitate the financing of the built environment’s sustainable transformation, this study systematically reviews the common instruments for financing green infrastructure and building projects. Benchmarking questions distinguishing the profile of green project finance from common construction project finance are developed based on the literature review and then are used for …

Nutrient Fate, Mass Balance, Species Selection, And Plant Management Strategies With Floating Treatment Wetlands, Carla Campbell

Doctoral Dissertations

Excess nutrients in shallow urban ponds can lead to harmful algal blooms, low dissolved oxygen, and internal phosphorus cycling. These effects can compromise municipal water supplies and cause negative impacts on fisheries and recreation. Floating treatment wetlands (FTWs) show promise to mitigate surface water nutrient pollution. However, despite recent research, many aspects of FTWs remain poorly characterized. The contribution of FTW components to nutrient removal, local species selection, and plant management strategies were the focus of this dissertation. Mesocosm experiments revealed that the combination of plants and coir fiber growth media in FTWs appeared to positively affect plant biomass gain …

Radio Frequency Wave Propagation Modeling Within Obstructed Underground Mining Environments For Effective Miner Localization During Mine Emergencies, Emmanuel Atta Antwi

Doctoral Dissertations

The reliability of underground wireless communication systems remains a significant challenge, particularly during emergencies when the mine environment becomes severely obstructed by debris, dust, and humidity. These environmental and geometric conditions result in significant attenuation of electromagnetic (EM) waves and multipath effects that undermine miner localization and rescue operations. Existing Vector Parabolic Equation (VPE) models are efficient for straight or mildly curved tunnels but fail to account for the random and obstructive conditions typically encountered during underground emergencies. This research develops a novel radio propagation model for EM wave behavior in underground mine drifts under geometrically obstructed conditions. The model …

Assessing The English Language Needs Of Student Pilots: A Comprehensive Analysis For Effective Aviation English Training, Triyani Rps Dewi, Lilis Kurnianingsih

International Journal of Aviation, Aeronautics, and Aerospace

This research aims to identify the English language material needs for pilot students at the Indonesian Civil Aviation Polytechnic in order to improve communication skills that are essential for flight safety and operational effectiveness. In data collection, the researcher distributed questionnaires to students and conducted a Focus Group Discussion (FGD) involving students, flight instructors, English lecturers, and experienced pilots. The research results show that pilot students need two main skills in English learning. First, listening skills, especially in understanding instructions from ATC. Second, speaking skills used to respond to ATC instructions and to make requests or ask for information from …

Field-Curing Methods For Evaluating The Strength Of Concrete Test Specimens, Pranshoo Solanki, Haiyan Xie

Faculty Publications – Technology

The purpose of this combined laboratory and field study was to evaluate field-curing methods of concrete specimens for estimating the early opening strength of an in-place concrete item. One Illinois Department of Transportation (IDOT) class PV mix was used to cast cylinders, beams, and in-place concrete slabs in October 2021 and February 2022. Concrete cylinders were cured using three methods: ambient air (method #C1), an insulated box/cooler (method #C2), and a power-operated box (method #C3). Beams were cured using two methods: ambient air (method #B1) and an insulated plywood box (method #B2). The cast-in-place specimens from each slab and cylinder …

Flipped Classroom Versus Lecture: A Quasi-Experimental Study Evaluating The Performance Of Dental Students.”, Manal Elhijazi, Ihsane Benyahya

Health Sciences

Background: The flipped classroom is an active pedagogical modality that improves learning, autonomy and critical thinking. This work aims to evaluate the impact of the flipped classroom on student performance compared to the lecture in a biomaterials course.

Material and methods:Second-year dental students were invited to participate voluntarily in this quasi-experimental study .Thus, they were divided into two groups: one group benefited́ from the flipped classroom while the control group attended the lecture. At the end of a formative evaluation for both groups, their average grades were compared using Student's test (significance threshold set at p

Results : …

Man On Mars: How Can International Space Law Limit The Environmental Consequences Of The Coming Rush For Resources In Space, Elizabeth Anne Henderson

Michigan Journal of International Law

The body of international law governing space has stood at a standstill for decades. The five central treaties regulating this area of law are not only vague, but they have also become a hindrance to the global community’s ability to address the rapidly intensifying second space race. The treaties do not adequately state who space belongs to, who is entitled to take advantage of the natural resources of celestial bodies, or what protections are afforded to celestial environments in the face of impending mining and resource extraction projects. This impasse within international law has not stopped entrepreneurs and corporations from …

Valorization Of Biomass Derivatives To Monomers By M-Mox Catalytic Hydrogenation & Hydrodeoxygenation, William Steere, Samir Castilla-Acevedo, Ben Auer, John Styers, Alan Allgeier

UNH URC Open (2026 and after)

With increasing concern regarding global warming contributions by fossil fuels in petrochemical production, the potential use of biomass-derived molecules to serve as a more eco-friendly feedstock has grown in popularity. Specifically, sebacic acid, a versatile chemical used to produce nylons, plasticizers, and lubricants, has the potential to be obtained from bio-renewable feedstocks and alleviate environmental drawbacks from fossil fuel petrochemical production. Our research validates the catalytic conversion of the biomass-derived 2,2’-bifuran 5,5’-dicarboxylate (BFDCM) to sebacic acid (SA), through M-MO_x catalyzed hydrogenation and hydrodeoxygenation. Catalytic activity tests were conducted for four different Pd-supported catalysts (C, Al₂O₃, …

Drag Reduction In Ground Vehicles Using A Model Porous Medium, Abdullah Ikram Nabi

Master’s Theses

This research investigates aerodynamic drag reduction on a 25° Slanted Ahmed Body (SAB) by integrating porous media model rods through combined experimental and computational methods at a Reynolds number of 1.16×10⁴. Two porous media configurations: short rods (6.75% of the model height) and long rods (20.0% of the model height), both featuring cylindrical rods with 80% porosity, were systematically compared against a baseline SAB. In-depth analyses were performed to investigate the wake flow topology, recirculation region characteristics, pressure coefficient distribution, Reynolds stress distributions and drag coefficient. Experimental investigations employed particle image velocimetry for precise flow visualization, while Reynold Averaged Navier-Stokes …

Using Post-Supercritical Co2-Assisted Method To Deposit Niep Alloy Coating On The Micro-Arc Oxidation Layer Of Az31 Magnesium Alloy And Its Corrosion Behavior Analysis, Kang-Yu Liao, Hung-Hua Sheu, Ming-Yuan Lin, Ming-Chih Kuo, Po-Hsun Wu, Hung-Bin Lee

Journal of Marine Science and Technology–Taiwan

In this study, a Ni-P alloy coating was deposited on the micro arc oxidation (MAO) layer of AZ31 magnesium alloy to improve its corrosion resistance. The MAO layers were prepared under different operated voltages from 300 to 400 V. The results indicated that the optimize operated parameters for MAO layer is at 350 V, the MAO coatings had the most compact microstructure and superior corrosion resistance. In order to improve the corrosion resistance of MAO coating, this study chose to deposit Ni-P alloy coating on the surface of MAO coating via the post supercritical CO₂-assisted electroless plating (PSC-CO …

The Effect Of Feedback On A Remote Operator’S Maneuvering Control For Mass Remote Navigation Competency, Hyoseon Hwang, Ik-Hyun Youn

Journal of Marine Science and Technology–Taiwan

The rapid advancement of Maritime Autonomous Surface Ships (MASS) technology has highlighted the growing need for Remote Operators (ROs) to manage MASS effectively. ROs possess specialized competencies in areas such as situational awareness, crisis management, and system operation. Despite the introduction of competency-based training and assessment in the maritime sector through the international convention on standards of training, certification, and watchkeeping for seafarers convention, the framework's implementation remains incomplete, particularly in remote operator training for MASS. This study is purpose to identify which competencies improve rapidly with performance feedback and which improve slowly. This study conducted an experiment to quantitatively …

Evaluation Of Carbon Sequestration In Seagrass Meadows Of Kenting: A Comparative Study With Penghu And Dongsha Island, Zih-Wei Tang, Huei-Fen Chen, Jordi Mahardika Puntu, Ping-Yu Chang, Li Lo, Jian-Jhih Chen, Wen-Chen Chou, Lan-Feng Fan, Ying-Ju Chang

Journal of Marine Science and Technology–Taiwan

This study investigates the controlling factors of carbon sequestration (CS) in seagrass bed sediments across three distinct environments in Taiwan: the Kenting (KT) coastal area, the Penghu (PH) open inner bay, and the Dongsha (DS) Atoll lagoon. Actual measurements of the substrate depth beneath the sediment and ground-penetrating radar (GPR) scans of the beach reveal that the coral reef bedrock in KT slopes landward. A field survey of the seagrass area in KT was conducted, and three cross-sectional profiles were analyzed to determine their topography, yielding a median sediment thickness of 88.2cm. Based on these measurements, the sediment volume was …

Calculation Of Aquifer Transmissivity From Borehole Resistance Measurements And Pumping Test Results, Fen-Rong Yang, Chien-Wei Huang, Tien-Kuen Huang

Journal of Marine Science and Technology–Taiwan

Transmissivity is a crucial hydrogeological parameter for evaluating groundwater resources. This parameter is conventionally evaluated using pumping tests; however, these tests are costly and can be conducted at few sites. Many researchers have used ground resistance and pumping test data to estimate various hydrogeological parameters. In this study, borehole resistance survey and pumping test data collected by the Taiwan Groundwater Monitoring Network were used to establish the relationship between transmissivity and formation factor for aquifers in the Zhuoshui River alluvial fan. This relationship was then used to estimate the water output of the aforementioned aquifers in a cost-effective manner from …

A Neural Network-Based Sliding Mode Adaptive Control System For Unmanned Surface Vehicles, Sun Qiaomei, An Liang, Jiang Linglin

Journal of Marine Science and Technology–Taiwan

Over the past decades, numerous studies have explored the use of autonomous unmanned surface vehicles (USVs). Successful USV operation requires a robust tracking control system to perform a range of tasks. However, USV dynamics are uncertain, time-varying, and nonlinear. This paper presents a neural network-based sliding mode adaptive control (NNSMAC) system to enhance USV tracking performance. Trajectories were generated using spline and polynomial interpolation based on a set of N predefined waypoints. Simulation results show that the proposed method outperforms traditional sliding mode control in error reduction, enabling more effective tracking.

Utilizing Information Technology And Hands-On Learning Practices To Improve Student Learning Outcomes In A High Failure Rate Introductory Programming Course, Todd Edward Thomas

Theses and Dissertations

The purpose of this study was to introduce and examine the impact that two interventions have on a high failure rate introductory programing course: a pedagogical approach of introducing Live Coding instruction technique to the in-person lecture portion, and a technological approach of introducing remote collaboration software (VS Code Liveshare) to the online lab portion. This study used convergent parallel mixed methods approach for both data collection and analysis; utilizing four data collection methods: 1) online survey questionnaires 2) in-depth interviews 3) in class observations and 4) quantifiable data collection (ie., student demographic, IT experience, GPA data). The Live Coding …

Hydronic Parking Lots: A Solution For Urban Heat Island Mitigation, Sumeet Jinnappa Paramaj

Theses and Dissertations

The Urban Heat Island (UHI) effect has emerged as a critical challenge in modern cities. It contributes to elevated local temperatures, placing significant stress on urban ecosystems and public health. One of the primary drivers of this phenomenon is the widespread use of impervious surfaces, such as dark-colored parking lots, which absorb heat during the day and gradually release it at night. This ongoing cycle results in persistently warmer urban environments. As cities continue to expand and densify, the need for effective, sustainable strategies to reduce urban heat becomes increasingly urgent.

This project aims to explore innovative interventions, particularly in …

Are We Ready For Synchronous Conceptual Modeling In Augmented Reality? A Usability Study On Causal Maps With Hololens 2, Anish Shrestha, Philippe J. Giabbanelli

VMASC Publications

(1) Background: Participatory modeling requires combining individual views to create a shared conceptual model. While remote collaboration tools have enabled synchronous online modeling, they are limited to desktop settings. Augmented reality (AR) offers a new approach by potentially providing the sense of presence found in physical collaboration, which may better support participants in achieving the sense of presence found in physical locations, thus supporting them in negotiating meaning and building a shared model. (2) Methods: Building on prior works that developed technology, we performed a usability study with pairs of modelers to examine their ability at performing key conceptual modeling …

A Blueprint To Greener Shorelines: Advancing The Effectiveness, Sustainability, And Widespread Adoption Of Coastal Nature-Based Solutions Through Transdisciplinary Research, Taylor M. Sloey, Sierra Hildebrandt, Rebecca L. Morris, Matthew V. Bilskie, Aaron Bland, David Bushek, Gabriella Dipetto, Daniel Elefant, Vincent Encomio, Ramin Familkhalili, Christine Hladik, Danielle Kreeger, Avery B. Paxton, Cindy M. Palinkas, Latina Steele, Andrew Scheld, Daisuke Taira, Jason D. Toft, Armando J. Ubeda, Christine Whitcraft, Donna Marie Bilkovic

Biological Sciences Faculty Publications

Coastal nature-based solutions (NbS) have emerged as powerful tools to enhance sustainable development and ecological restoration goals. As a rapidly growing field spanning across social, political, ecological, economic, and engineering disciplines, it is critical that researchers working in coastal NbS regularly attempt to identify emerging focal areas for scientific inquiry. Following the 27th Biennial meeting of the Coastal and Estuarine Research Federation, we provide a transdisciplinary perspective (including biologists, engineers, oceanographers, geoscientists, economists, and facilitators of workforce training programs) of pertinent research questions that, if answered, will advance the effectiveness, sustainability, and widespread adoption of coastal NbS. These suggestions for …

Form And Function In Mobulids: A Comparative Analysis Of Filter Morphology With Bioinspiration Applications, J. B. Teeple, S. R. Kahane-Rapport, K. E. Cohen, L. Hamann, J. A. Strother, E. W. M. Paig-Tran

Biological Sciences Faculty Publications

Mobulas (manta and devil rays) are large-scale ram filter feeders that separate planktonic food particles from large volumes of water with minimal clogging. This contrasts with most human-made filters that can suffer from problematic clogging requiring additional mechanisms for clearing blocked surfaces and maintaining performance. Prior studies have shown that mobulas employ a unique mechanism referred to as ricochet separation to filter feed, whereby captive vortices in filter pores cause particles to bounce off the filter surfaces and away from the filter pores. This mechanism enables the filtration of particles smaller than the pore size and reduced clogging. However, few …

The Impact Of Direct Emergency Policies Of Corona Pandemic On The Education Process Affecting Economic Labor Productivity, Shimaa Mohammed Hamdy Derbala, Usama Helmy Mohmmed

Mansoura Engineering Journal

This research examines the impacts of immediate emergency policies of the Corona Virus pandemic on the education process at Minya University; Egypt; along with impacts on economic labor productivity. It hypothesizes that academic performance of graduates during the pandemic declined, including impacts on employment, quality of labor, and economic productivity.The research reviews experiences of Malaysia, KSA, Kuwait, and Egypt in managing the education process during the pandemic. Two questionnaires were used, to analyze students’ satisfaction with the experience of distant teaching/learning, and to analyze workers’ satisfaction with the efficiency of economic labor productivity during the pandemic. SPSS Non …

The Impact Of 'Decent Life' Initiative On Sustainable Urban Development: Abu Galal Village In Egypt As A Case Study, Sally Hassan Abd-Elazim, Sherif Ahmed Sheta, Medhat Ahmed Shaban

Mansoura Engineering Journal

The “Decent Life” Initiative aims to enhance living conditions and support sustainable urban development in Abu Jalal village, Sherbin city, Dakahlia Governorate, Egypt. The research aims to assess the effectiveness of the 'Decent Life' initiative in promoting sustainable urban development in Egyptian villages, focusing on improving its mechanisms for future use and maximizing benefits in other villages facing similar challenges.. The research employs various methods, including surveys and questionnaires targeting local residents, evaluation based on SDG 11, and GIS software for spatial analysis. Research identifies key areas of improvement across housing, healthcare, transport, education, infrastructure, job opportunities, disaster resilience, waste …

Computer Aided Detection System For Liver Cancer Using Computed Tomography Images Based On Artificial Intelligence, Noha Saad Badrawy, Hanan M. Amer, Apeer T. Khalil

Mansoura Engineering Journal

The prevalence of liver cancer has surged in Egypt and worldwide, leading to increased use of AI for tumor detection and diagnosis. The objective is to boost accuracy and minimize errors in manually classifying liver images, a task that is laborious and time-consuming. This study seeks to create a high-performance system for detecting liver tumors in Computed Tomography "CT" scans, utilizing Convolutional Neural Networks "CNNs" and machine learning, which are prevalent in biomedical imaging. With a dataset of 9,255 CT images, the research involves three steps. First, three deep learning models are compared: that Liver Tuned High-Resolution Network (LTHR-Net), Deep …

A Study Of The Properties Of Fleece Knitted Fabrics Made From Cotton And Different Types Of Regenerated Cellulosic Fibers For Apparel Use, Mohamed Hakam, Alaa Arafa Badr, Ashraf El-Nahrawy

Mansoura Engineering Journal

Yarn material and fabric type affect the quality of knitted fabric. Weather temperature, humidity, and moisture resistance of the garment are the primary factors that determine the evaporation rate of sweat from the body surface. Also, some physical and mechanical properties control the comfort level required by the customer. The present research work was carried out by varying the following parameters: Yarn type with different materials was changed by changing yarn cones through the creel of the knitting machine. Machine Parameters, in this study samples were made on Two- Thread Fleece, and Three- Thread Fleece Machines. These parameters have been …

Lstm-Based Model For Intrusion Detection In Sdn-Iot Networks, Randa Srour Ali, Eman Abdelhalim, Hala B. Nafea, Ahmad Hassan

Mansoura Engineering Journal

Ensuring security in Software-Defined Networking (SDN)-enabled Internet of Things (IoT) environments is a critical challenge due to the increasing complexity of cyber threats. This study proposes an intrusion detection system based on Long Short-Term Memory (LSTM) networks to enhance security in SDN-IoT networks. The research methodology involves data preprocessing, feature selection, and model training using the SDN-IoT dataset. Data preprocessing includes handling missing values and applying various encoding (label, one-hot, frequency, binary) and normalization (minmax, log, robust, z-scaling) techniques to optimize feature representation. Feature selection, conducted using Random Forest and correlation matrix analysis, reduces the feature set from 33 to …

Improving Load Capacity Of Steel Beams With Corrugated Webs Using Stiffening Plates, Aya Fouda, Mohamed Dabaon, Saad Eldeen Mostafa Abdrabou, Mohamed Ghannam

Mansoura Engineering Journal

In the last decades, Steel Beams with Corrugated Webs (SBCWs), especially those with trapezoidal profiles, are extensively employed in structural applications owing to their superior strength-to-weight ratio and improved structural stability under various loading conditions. While the behavior of SBCWs has been widely investigated, comparatively fewer studies have explored approaches aimed at improving their structural performance through strengthening techniques. This study presents numerical investigation into the capacity enhancement of SBCWs through the application of horizontal stiffeners and reinforcing plates. The numerical results were validated against existing experimental and computational data from previous research. The finite element method was employed to …

Experimental Investigations For The Influence Of Pile Group Positions On Local Scour Geometry, Osama Nagah, El-Masry A. A, Reda Diab

Mansoura Engineering Journal

The sustainable development of coastal infrastructures such as docks and marine piers as well as riverine structures such as bridges, is critical to strengthening the global economy and developing international trade relationships. As a result, it is critical to provide vital insights into the hydraulic and geomorphological implications of any changes to infrastructures, enhancing our comprehension of sustainable practices in the marine and riverine environments. So, this experimental study delves into the intricate dynamics of scour hole morphology caused by integrating additional new pile group alongside before or behind an existing one, focusing on local scour deformations induced through extending …

Establishing Performance Criteria For Evaluating Watershed-Scale Sediment And Nutrient Models At Fine Temporal Scales, Aayush Pandit, Sarah Hogan, David Tyler Mahoney, William I. Ford, James F. Fox, Christopher Wellen, Admin Husic

Civil Engineering Faculty Publications

Watershed water quality models are mathematical tools used to simulate processes related to water, sediment, and nutrients. These models provide a framework that can be used to inform decision-making and the allocation of resources for watershed management. Therefore, it is critical to answer the question “when is a model good enough?” Established performance evaluation criteria, or thresholds for what is considered a ‘good’ model, provide common benchmarks against which model performance can be compared. Since the publication of prior meta-analyses on this topic, developments in the last decade necessitate further investigation, such as the advancement in high performance computing, the …

An Approach To Quantifying The Lifecycle Sustainability Impacts Of Tungsten Carbide Tools, Gatewood Arnold, Julian Polizzi, Syed Ibn Mohsin, Daniel Carnesi, Julius Schoop, Fazleena Badurdeen

Mechanical Engineering Faculty Publications

Tungsten carbide cutting tools are widely used for their high machining performance and low cost. However, their cost does not currently reflect the material rarity, environmental costs, nor societal costs associated with their production. Critically, embodied energy makes a sizeable contribution to the total lifecycle energy consumption. This study quantifies the true triple bottom line cost of the tools with respect to established sustainability metrics by leveraging cross-disciplinary insights from the product, process, and system levels. Based on the adjusted cost, a comparative analysis of the cutting tool sustainability on the profitability of a nickel-based superalloy machining process was carried …

A Multi-Scale Finite Element Method For Investigating Fiber Remodeling In Hypertrophic Cardiomyopathy, Mohammad Mehri, Kenneth S. Campbell, Lik Chuan Lee, Jonathan F. Wenk

Mechanical Engineering Faculty Publications

A significant hallmark of hypertrophic cardiomyopathy (HCM) is fiber disarray, which is associated with various cardiac events such as heart failure. Quantifying fiber disarray remains critical for understanding the disease’s complex pathophysiology. This study investigates the role of heterogeneous HCM-induced cellular abnormalities in the development of fiber disarray and their subsequent impact on cardiac pumping function. Fiber disarray is predicted using a stress-based law to reorient myofibers and collagen within a multiscale finite element cardiac modeling framework, MyoFE. Specifically, the model is used to quantify the distinct impacts of heterogeneous distributions of hypercontractility, hypocontractility, and fibrosis on fiber disarray development …