Digital Commons Network^™

Impacts Of Intensifying Wildfires On Boreal Forest Ecosystems: Exploring Forest Regeneration, Wildlife Habitats, Carbon Storage, And Engineering Solutions, Mckenzie Belle Schewe

Theses and Dissertations

Wildfire activity across Alaska’s boreal forests has intensified in severity and frequency in recent decades, altering one of Earth’s most significant sources of carbon sequestration (Pan et al, 2011). This thesis examines how wildland burns influence post-fire carbon sink capacities and vegetation recovery near Fairbanks, Alaska. Three fire sites were selected to represent distinct successional stages: the 2006 Parks Highway Fire, the 2013 Stuart Creek 2 Fire, and the 2022 Clear Fire. Each site was evaluated through a combination of remote sensing analysis, LiDAR-derived canopy height data, and field measurements collected within each burn perimeter, developing a replicable framework for …

Degradable And Tunable Silyl Ether And Silyl Ester Containing Polymers: Synthesis, Characterization, Hyperbranching, And Applications, Vladimir Vladimirovich Zotov

Theses and Dissertations

The development of degradable polymers has emerged as a significant focus within academic research, driven by increasing concerns over non-degradable waste. Previous studies showed the ability to degrade the Si-O-C bond in mild conditions, which was further taken into medical applications. The slow degradation time of the linear polymers and their nanoparticles in mild conditions led us to pursue two different solution paths. In this work we looked at hyperbranched poly(silyl ether)s A2+B3 and A2A’+B3 methodologies and silyl ester containing polymers. Hyperbranched polymers show potential in drug delivery applications as they are capable of loading more of the drug and …

Mechanistic Analysis Of Rare Earth Element Extraction From Coal Byproducts Using Supercritical Fluid Process: Solubility Studies Of Supercritical Carbon Dioxide With Tbp: Hno3 Complex, Zakiya Konda Nurudeen

Engineering

This thesis introduced the essence of REE application in the modern world, the primary and secondary sources of REEs. It revised the fundamentals of supercritical carbon dioxide (SC- CO2), its application in REE extraction as green technology, the complex formation of tributyl phosphate (TBP)- nitric acid (HNO3), and temperature-pressure effects in REE extraction. The methodology systematically examined the thermodynamic solubility of CO2 in TBP-nitric acid (HNO3) complexes at three molar ratios (2:1, 1:1, and 1:2), temperatures between 40-60 degrees Celsius, and at a maximum pressure of 12 MPa, respectively. Preliminary extraction experimental runs were conducted to validate solubility studies. Data …

Finite Element Analysis For The Development Of A High-Efficiency Novel Dual-Stator Electric Generator For Renewable Energy Conversion Applications, Sunday Omokhoya Joseph

Engineering

Renewable energy has become a persuasive solution for reducing the negative impacts of conventional energy sources and providing sustainable options to rural communities without access to the power grid. As the development of renewable energy advances, electric machines are crucial for efficiently converting and integrating these energy resources into the electrical grid. However, conventional single-stator alternating current electric machines face several challenges that hinder efficient energy conversion, such as harmonic distortion, high core and copper losses due to multi­ple winding groups, and structural complexity. These issues limit their performance, particularly in renewable energy applications such as wind and hydrokinetic power, …

State And Parameter Estimation Of Synchronous Generator Using Particle Filter In Classical Model Of Generator, Sauraj Poudel

Engineering

The accurate parameterization of machines in power systems is crucial during modeling to study the behavior of the modern power system. However, the parameters of synchronous machines are susceptible to change from the original manufacturer’s specifications due to factors like degradation of the windings and core or for rewound machines. Traditional methods to update these parameters require taking generators offline for various testing methods, which results in substantial revenue losses to the utility and sometimes blackouts in small remote microgrids. To overcome this challenge, this study proposes an approach for online parameter estimation by using available data from the generator …

Pan-Cancer Single Cell Transcriptomic Clustering Reveals Heterogeneous Cd8+ Exhausted T Cell Populations With Different Immune Checkpoint Inhibitor Responses, Rui Mu, Rasha Barakat, David H Gutmann

2020-Current year OA Pubs

In most cancers, T lymphocytes comprise an essential cellular component of the non-neoplastic microenvironment, where they have the capacity to both suppress and support tumor growth. One specialized T lymphocyte population is the CD8

Ai-Driven Decision-Making In Leadership: Balancing Automation And Human Judgment For Optimal Organizational Performance, Arafat Mohammed, Sulaiman Abdullahi Bambale, Umar Abdullahi

Journal of Economics and Administrative Sciences

This study examines how artificial intelligence (AI)-driven decision-making can be effectively balanced with human judgment to enhance organizational performance and ethical leadership. The research adopts a systematic literature review covering studies from 2015 to 2025, retrieved from Scopus, Web of Science, IEEE Xplore, and Google Scholar. Through thematic analysis, the review identifies three core dimensions: (1) the impact of AI on strategic accuracy and operational efficiency, (2) the mediating role of human judgment in fostering innovation and trust, and (3) the influence of ethical AI governance on employee well-being and accountability. The findings reveal that organizations integrating AI’s analytical precision …

Exploring The Role Of Transformation-Oriented Behavioral Accounting In Business Sustainability: A Qualitative Research, Nadia Dakhil Enad

Journal of Economics and Administrative Sciences

Behavioral accounting is an interdisciplinary approach that the substantially contributes to financial decision-making by providing analysis of behaviors and guides managers throughout the risks to help organizations achieve their goals. This study examines the impact of transformation-oriented behavioral accounting on business sustainability within Baghdad’s State Company for Textile and Leather. The study employed a qualitative approach and an interpretative phenomenological method. The statistical population consisted of the managers of the Baghdad Textile and Leather Company. From this population, 14 individuals with their knowledge of accounting and behaviorism were selected through purposive sampling. Sampling continued until data saturation was reached. The …

The Effect Of Organizational Culture On Faculty Performance: An Analytical Study Of A Sample Of Lecturers At Some Colleges In The Kurdistan Region Of Iraq, Hoshmand R. Ibrahim

Journal of Economics and Administrative Sciences

The research problem of this study is to determine the connection between organizational culture and faculty performance in higher education, specifically, in the Kurdistan Region of Iraq, which consists of the public universities. Using the organizational culture theory and performance management models, the study explores three dimensions of culture, such as cooperation and communication, innovation and development, and appreciation and rewards, and their effects on the performance of the faculty in terms of academics, research, and administration/service. Quantitative approach was adopted through a structured questionnaire that was issued to faculty members working in different fields. The conceptual model of the …

Benefits And Challenges Of Using Chatgpt: An Exploratory Study On English Language Program, Jamal Kaid Mohammed Ali

UB Journal for Humanities

This study was conducted during the early stages of ChatGPT's emergence to explore faculty members' perceptions of its benefits and challenges in the field of English as a Foreign Language (EFL). Employing an exploratory descriptive research design, the study gathered both quantitative and qualitative data from a sample of 58 faculty members at the University of Bisha, Saudi Arabia. A questionnaire consisting of closed-ended and open- ended items was utilized to collect information about the opportunities presented by ChatGPT and the challenges it poses in the field of EFL. The results indicated that while most EFL teachers held a highly …

Assessing Knowledge, Attitudes, And Consumption Of Traditional Chinese Herbal Medicine Among Filipinos Post Covid-19 Pandemic, Jane Yugioksing

Social Transformations Journal of the Global South

Traditional Chinese Medicine (TCM) in the Philippines has existed as early as the first wave of migrants but has remained confined within a prescribed settlement in the Manila district known as Parian. Over the years, TCM has existed independently as a modality of treatment to improve one’s health, mostly catering only to the Chinese in the country. At the height of the COVID-19 pandemic, the Philippines’s Food and Drug Administration (FDA) approved the use of the TCM capsule Lian Hua Qing Wen as part of the COVID-19 treatment option, which was highly patronized by the mainstream Philippine society at that …

Mirza Sadaqat Huda, Sharon Seah, Qiu Jiahui, Eds., Energy And Decarbonization In Southeast Asia, Volume 2, Singapore: Iseas – Yusof Ishak Institute, 2025, 259 Pp., Blaise Joshua Morales

Social Transformations Journal of the Global South

Excerpt: Energy and Decarbonization in Southeast Asia, Volume 2 is edited by Mirza Sadaqat Huda, Sharon Seah, and Qiu Jiahui. This volume brings together perspectives from leading experts in the region, providing a comprehensive overview of Southeast Asia’s energy transition. Published in 2025 by ISEAS – Yusof Ishak Institute, the book highlights its contemporary relevance in the evolving landscape of energy and decarbonization. This volume offers crucial insights for Southeast Asia’s urban planners, energy strategists, and regional policymakers. It addresses the challenges and opportunities faced by key stakeholders involved in shaping the region’s energy future—a timely and multidisciplinary compendium in …

Hyperspectral Image Characterization Of Degraded Field Railroad Ballast Under Varying Fouling And Water Contents: Potentials For Reuse And Sustainability, Khin The The Aung

Electronic Theses and Dissertations 2020 - Present

Railroad ballast performance is affected by fouling materials that contain plastic and granular properties. The characterization of fouling materials are important factors in assessing track performance and maintenance requirements. This study presents the

hyperspectral reflectance characteristics of the degraded field railroad ballast under varying fouling contents (FCs) and water contents (WCs). The study involves experiments including material selections, preparation of railroad ballast samples, fouling materials, Hyperspectral Imaging (HSI) data acquisition and calibration, methodology for regression using Gaussian Process Regression and Artificial Neural Network (ANN) Regression, discussions, and conclusions. Gaussian and ANN Regression models are applied to generate the actual and …

Historical Context In Mathematics Education: Improving Student Engagement And Achievement, Colette Chilton-Carr

Electronic Theses and Dissertations 2020 - Present

There are many informational gaps in contemporary mathematics education. Students see the mathematical topics they are being taught as facts and procedures unrelated to each other or to themselves as mathematicians. Many ancient developments in the realm of mathematics are still relevant today, showcasing the needs that motivated their longstanding evolution. By including the stories behind the formulas in mathematics classrooms, students from diverse backgrounds can feel seen and connected to their education. The inclusion of the holistic background of mathematics cannot be nurtured in the classroom without buy-in on the parts of both students and instructors, as well as …

Quality Improvement Project: Nursing Education In Relation To The Use And Effect Of Neuromuscular Blockade Agents, Lauren Danielle Bowen

Doctor of Nursing Practice Projects

Neuromuscular blockade agents are a medication class that requires education and knowledge to ensure protocols, assessments, and tools are utilized in acute care facilities. Quality improvement (QI) project focused on the use of neuromuscular blockage agents to ensure nursing staff, who have direct patient contact, received proper education. A quasi-experimental, pre-post project intervention design was used to evaluate evidence-based practice interventions with a literature review, assessment, and tools used by the population studied. Aim and purpose of the QI project was to increase nursing staff educational knowledge on the use of neuromuscular blockade agents in patients who are sedated requiring …

An Active Learning Simulation For Teaching Hadoop In An Undergraduate Business Curriculum, Ruben A. Mendoza Ph.D., Liyuan Liu Ph.D.

International Journal for Business Education

This paper shows the effectiveness of an experiential learning activity for teaching core Hadoop concepts to undergraduate business students across all majors (Finance, Marketing, etc.). The complexity of Hadoop, with its distributed computing model and deep technical requirements, presents significant challenges in educational settings. The simulation was developed for an introductory course in a Business Intelligence & Analytics (BI&A) curriculum and adapted for use in a Database Management (DB) course. Results show significantly higher performance on questions centered on the topic in an online test preparation game with a total of 236 students in 11 different offerings of the course. …

Investigation Of Insertion Loss In Inkjet-Printed Coplanar Waveguide Based On Drying Temperature, Jun Ho Yu, Sung Min Sim, Jin Woo Choi, Sang Ho Lee, Jung Mu Kim

Michigan Tech Publications

In this study, we propose an optimized inkjet printing process to improve the insertion loss of inkjet-printed coplanar waveguide (CPW) transmission lines. The process involves varying the drying temperature and adjusting the number of printing steps to investigate their effects on the electrical characteristics of the printed CPW. The relationships between surface roughness, surface cavities, morphological changes, and insertion loss are studied by conducting atomic force microscopy analysis and by examining the insertion loss up to 3 GHz. The printed CPW that underwent low-temperature drying after the first printing and high-temperature drying after the second printing before sintering showed improved …

Biological Impact Of Chemical-Based Medications On Human Dna: Mechanisms, Clinical Consequences, And Research Gaps, Israa M. Ali Alameen, Sumayah Mahmood Rafid, Baqer Khaled Hothefa

Al-Esraa University College Journal for Medical Sciences

Background: Not long ago DNA has become the subject of interest for the pharmaceutical companies, that because its proven by medical and scientifical fields, that it’s the fundamental sources of proteins, which is the basic element in the cell, therefore, the interaction between the Drug and the deoxyribonucleic acid (DNA) is very important to therapeutic regimens success but in other side it has a dangerous effect like toxicity, and long-term genomic instability. Objective: The aim of this review is to focus on the different studies which examines the effect of different drug like the chemotherapy, antivirals, antibiotics, and immune-suppressants on …

The Dynamics Of Terrorism And Counter-Terrorism: The South Africa Experience, Oluranti Samson Afowowe

Journal of Terrorism Studies

Defining Terrorism within the context of South African government promulgated Terrorism Act of 1967 as’ action(s) that endanger the maintenance of law and order’, innocuously suggest that the phenomenon of terrorism in South African political space is not a recent development. This study examines the historical, socio-economic and demographic dis-equilibrium as indicative factors of terrorism within the context of South Africa. Theoretical postulations on the phenomenon of terrorism within the context of South Africa state experience also engaged the attention of this study. Attempts are made to identify the nexus between social relationships and the nature, essence and political dimensions …

Evaluating The Effects Of The Counterinsurgency On Boko Haram In Nigeria, Godwin Ejuvwedia Sadjere, Ekene Jude Onyiriuka, Justice Chinedu Mbam, Eloghosa Anderson Ikponmwonba, Ngozi Palmer Onyiriuka, Samuel Adedeji Afolabi

Journal of Terrorism Studies

Boko Haram insurgency debuted in Nigeria in 2009 and has been on for more than eleven years and has become intractable even after the government instituted a counterinsurgency in 2013. This paper analysed the effect of the counterinsurgency on Boko Haram and the insurgency in Nigeria in general based on attacks by the insurgents.

Historical data on attacks by Boko Haram and other criminal groups were collected using web scraping by Python and subjected to statistical analysis to build a relationship between the insurgency and the counterinsurgency. Eleven years data from 2012 were collected but six years data from 2017 …

The Effect Of Heat Treatment Duration On The Psychochemical, Mechanical, And Biodegradability Of Polyvinyl Alcohol/Gambir Extract Biocomposite Films, Ainul Kahfi Muhlasin, Poppy Puspitasari, Heru Suryanto, Diki Dwi Pramono, Dieter Rahmadiawan, Billie Jack Pasion

Journal of Mechanical Engineering Science and Technology (JMEST)

This study investigates PVA-based films with the addition of gambir and heat treatment to improve the characteristics of the film. Methods include the synthesis of PVA film with gambir addition (0.5%), treated by heat treatment for 40 minutes and 60 minutes. The film was characterised by physicochemical, mechanical properties, and biodegradability. Data was analyzed using ANOVA with a significance of 95%. Results indicate that the surface of PVA/gambir films is smoother and more homogeneous as the heat treatment duration increases. New peaks of functional groups were identified after the addition of gambir at the C-C and C-O groups. After heat …

The Impact Of Pine Resin-Epoxy Ratios On Fire Resistance And Acoustic Performance Of Banana Fiber Composites, Cokorda Istri Putri Kusuma Kencanawati, Dewa Ngakan Ketut Putra Negara, I Gede Andy Andika Parahita

Journal of Mechanical Engineering Science and Technology (JMEST)

Because of their low environmental impact and biodegradability, composite materials derived from natural fibers and resins have drawn interest as sustainable substitutes for synthetic materials in thermal and acoustic applications. Two promising natural components are banana stem fiber and pine resin, but they need to be modified due to their mechanical limitations and flammability. Epoxy resin is commonly used to enhance structural performance; however, its effects on acoustic and fire resistance properties require further investigation. This study examined how different epoxy resin contents affected the sound absorption and fire resistance of composites made from banana stem fiber and pine resin. …

Analysis Of Engine Parameters Of High Composition Palm Oil Biodiesel In Crdi System, Achmad Aminudin, Kelvin Dwi Wardana, Nanang Romandoni, Ahmad Yusril Aminullah, Nur Ihda Farikhatin Nisa, Hari Setiapraja

Journal of Mechanical Engineering Science and Technology (JMEST)

The heavy reliance on fossil fuels has serious consequences, particularly regarding increased greenhouse gas emissions that contribute to global warming. In order to obtain cleaner fuel resources and reduce fossil fuel dependence, palm oil biodiesel is added to fossil diesel by volume ratio resulting in B50 and B55 blends. Combustion characteristics, performance, fuel consumption, and emissions were performed in a diesel engine with a 4-cylinder common rail direct injection (CRDI) at different engine speeds (1500, 2000, 2500, and 3000 rpm). Compared to fossil diesel, biodiesel blends exhibit higher density at 855.9 kg/m³ (B55), kinematic viscosity with a value of 5.1 …

Effect Of Argon Gas Flow Rate On Crystal Structure, Morphology, And Optical Properties Of Cigs Film For Photodetector Applications, Nurul Lathi’I Fatul Chamidah, Fadilah Wulan Cahyani, I Gusti Ayu Isnaini Fatha Ramadhani, Erma Surya Yuliana, Nasikhudin Nasikhudin, Safwan Abd. Aziz, Nandang Mufti

Journal of Mechanical Engineering Science and Technology (JMEST)

CIGS material can be used as a material for photodetector applications. The deposition of CIGS thin films remains challenging. Generally, argon is used as a gas to bombard the CIGS material through the sputtering method. This study fabricated photodetectors by varying the argon gas flow rate (50-80 sccm) to investigate its effect on device performance. XRD, SEM, UV-Vis, and photoresponse tests were characterized. Structural analysis using XRD showed a weak (112) diffraction peak, indicating that the resulting film was not fully crystalline, but rather consisted of a nanocrystalline phase, even partly amorphous, with small crystallite sizes. According to the SEM …

Impact Of Cpo And B35 On Diesel Engine Rocker Arm Wear During Long-Term Operation, Fawwaz Aqilah Nurmansyah, Nur Fadilah Rizky Supramono, Muhammad Ikhsan, Erwan Adi Saputro, Wiliandi Saputro

Journal of Mechanical Engineering Science and Technology (JMEST)

The increasing number of motor vehicles has led to higher fossil fuel consumption, contributing to greenhouse gas emissions, climate change, and environmental degradation. As a renewable alternative, biodiesel offers a way to reduce these impacts. Indonesia, with its abundant natural resources, has significant potential for biodiesel production. Crude palm oil (CPO) is a promising feedstock due to its availability and relatively low environmental impact. However, the high costs associated with the transesterification process make direct use of pre-heated CPO an area worth exploring. This study investigates the impact of pre-heated pure CPO compared to B35 ("Dexlite") on rocker arm wear …

Assessing Community Readiness And Benefits Of A Nursing Program: Implications For Healthcare And Education, Mary Anne Frances D. Reyes, Aaron A. Funa, Robert Jamisola, Ma. Joahna D. Perdigon, Jerica D. Latonero

Jurnal Keperawatan Indonesia

In response to recent policy shifts allowing the establishment of new nursing programs in the Philippines, this study assesses the perceived readiness of Sorsogon, a geographically underserved province, to implement a bachelor of science in nursing program. It also explores the anticipated benefits that such a program may offer to students and the local community. A cross-sectional survey of 375 stakeholders, selected through purposive sampling, was conducted using a validated instrument developed through expert consultation. Quantitative data were analyzed using descriptive statistics, while qualitative responses were examined through thematic analysis. The findings reveal widespread support for the proposed program, emphasizing …

Jhtdb-Wind: A Web-Accessible Large-Eddy Simulation Database Of A Wind Farm With Virtual Sensor Querying, Xiaowei Zhu, Shuolin Xiao, Ghanesh Narasimhan, Luia A. Martinez-Tossas, Michael Schnaubelt, Gerard Lemson, Hanxun Yao, Alexander S. Szalay, Dennice F. Gayme, Charles Meneveau

Mechanical and Materials Engineering Faculty Publications and Presentations

This paper introduces JHTDB-wind (https://turbulence.idies.jhu.edu/datasets/windfarms), a publicly accessible database containing large-eddy simulation (LES) data from wind farms. Building on the framework of the Johns Hopkins Turbulence Database (JHTDB), which hosts direct numerical and some large-eddy simulation datasets of canonical turbulent flows, JHTDB-wind stores the full space-time (4D) history of the flow and provides users the ability to access and query the data via a web-based virtual sensor interface. The initial dataset comprises LES results from a large wind farm with 6 X 10 turbines, modeled using a filtered actuator line method, under conventionally neutral atmospheric conditions. This data comprises one …

Optimizing Zeolite Catalysts For Efficient Ldpe Plastic Waste Pyrolysis, Hilda Porawati, Mazwan Mazwan, Sukadi Sukadi

Journal of Mechanical Engineering Science and Technology (JMEST)

The problem of plastic waste, particularly from low-density polyethylene (LDPE) plastic bags, poses a significant challenge in environmental management due to its non-biodegradable nature and widespread use in daily life. This study evaluates the influence of catalyst types on the characteristics and energy efficiency of liquid fuel products produced from LDPE waste pyrolysis. The three treatments compared were no catalysts, natural zeolite catalyst, and synthetic zeolite catalysts, each subjected to three different temperature variations: 250°C, 300°C, and 350°C. The observed parameters in this study were volume, product mass, cetane index, density, sulfur content, viscosity, flash point, calorific value, and energy …

One-Way Thermal-Fluid-Solid Coupling Analysis Of Helicopter Tail Reducer With Spiral Bevel Gear, Dongping Sheng, Zhongyuan Ma, Chenqi Zhou, Haidong Feng, Hun Guo, Chun Su

Journal of Mechanical Engineering Science and Technology (JMEST)

This research focuses on investigating the thermal-fluid-solid coupling behavior within spiral bevel gears to enhance the bearing capacity and extend the operational service life of the gear reducer located in the helicopter tail gearbox. The study commences by constructing detailed, parametrically defined threedimensional digital models. These models accurately represent the critical components: the spiral bevel gear itself, the surrounding gearbox housing, and the supporting gear shaft, based directly on the specifications of an actual helicopter tail reducer assembly. Subsequently, the analysis proceeds with a one-way, steadystate thermal-solid coupling simulation performed on the established model assembly. This critical simulation phase aims …

Thermophysical, Rheological And Wear Resistance Of Canola Oil Biolubricant With Calcium Carbonate Additive Nanoparticle As Coolant In Cnc Machining, Alfandi Jaelani, Poppy Puspitasari, Diki Dwi Pramono, Alief Muhammad, Muhammad Kozin, Muhammad Kashif

Journal of Mechanical Engineering Science and Technology (JMEST)

Vegetable oil-based cutting fluids are of great importance in supporting green and sustainable manufacturing. This research introduces a new groundbreaking vegetable lubricant formulated with canola oil as the base material, coupled with CaCO3 nanoparticles synthesized from scallop shell waste and used as a cutting fluid in the AISI 1045 CNC machining process steel sprayed with minimum quantity lubrication (MQL). This investigation delves into the thermophysical, rheological, and wear resistance of the developed bio-lubricant. The results of this analysis show density value increased in the canola + CaCO3 0.15% sample by 3.28% of the pure canola sample, as did the viscosity …