Digital Commons Network^™

High Torque Density Dual-Stator Vernier Motors With Flux Concentrating Rotors, Esmaeil Mohammadi, Ali Mohammadi, Mohammad Amin Jalali Kondelaji, Pedram Asef, Ion G. Boldea, Dan M. Ionel

Electrical and Computer Engineering Graduate Research

Axial Flux Permanent Magnet (AFPM) machines are increasingly being studied for low-speed, direct-drive applications due to their compact structure and high torque output. This study proposes two novel dual-stator AFPM vernier machine topologies: a spoke-type rotor configuration and a back-to-back Halbach array rotor. Both designs employ dual outer stators with 12 double-layer concentrated windings, and high-polarity rotor configurations to enhance flux concentration. A three-dimensional finite element model, which was previously validated by a laboratory prototype motor was utilized to evaluate the electromagnetic characteristics of the proposed topologies. These characteristics include torque density, airgap flux distribution, and harmonic content. Comparative results …

Multi-Phase Wireless Power Transfer With High Power Density Inductive Coils For Electric Drone Charging, Lucas A. Gastineau, Donovin D. Lewis, Omer Onar, Dan M. Ionel

Electrical and Computer Engineering Graduate Research

Wireless charging of unmanned ground vehicles and aircraft has been proposed to increase charging reliability and security, allow for autonomous functionality, and either reduce battery size or increase continuous flight time. This paper proposes a three-phase Litz wire primary and a two-phase PCB secondary for high secondary-side power density considering misalignment tolerances, surface and volumetric power density, and coil sizing. Electromagnetic 3D finite element analysis (FEA) simulations are conducted to study variation in mutual inductance and coupling coefficient with different secondary coil sizes and number of turns, horizontal and vertical misalignment between the primary and secondary, and a combination of …

Nonlinear Design Scaling Of Electric Machines Based On Hybrid De And Meta-Modeling Application To Synchronous Motors With Combined Pm Stator And Reluctance Rotor Excitation, Oluwaseun A. Badewa, Dan M. Ionel

Electrical and Computer Engineering Graduate Research

This paper presents an innovative method for nonlinear scaling of electric machines by integrating machine learning (ML)-based meta-modeling with a differential evolution (DE) algorithm. The technique is applied to high-performance combined-excitation synchronous electric motors which exhibit highly nonlinear characteristics, making performance scaling challenging. The proposed approach employs an ML meta-model trained on data obtained from finite element analysis (FEA), utilizing an experimentally validated model for nonlinear scaling and performance prediction at different power ratings. The accuracy of the meta-model in capturing the nonlinear relationships between design parameters and motor performance is first assessed using metrics such as R-squared (R2) and …

Multi Electric Machines With Series And Parallel Electromechanical Combinations For Aircraft, David R. Stewart, Donovin D. Lewis, Matin Vatani, Diego A. Lopez-Guerrero, Dan M. Ionel

Electrical and Computer Engineering Graduate Research

High-performance electric propulsion systems require fault tolerant, power dense, electric machines capable of maintaining high efficiency across a dynamic range of operation. To address these inherently conflicting requirements, multi-motor architectures employing electromechanically coupled modular configurations have been proposed to enhance system efficiency, fault tolerance, and redundancy. This paper investigates four mechanically coupled configurations for a coreless axial flux permanent magnet (CAFPM) motor unit integrating series, parallel, and hybrid architectures with differential and gearbox coupling. Performance and optimal sizing for motors in each configuration are determined through 3D finite element analysis (FEA). To assess fault tolerance and system redundancy, Markov chain …

Design Optimization And Scaling Of Coreless Afpm Machines Using Hybrid Fea-Based Differential Evolution And Machine Learning, Matin Vatani, David R. Stewart, Donovin D. Lewis, Dan M. Ionel

Electrical and Computer Engineering Graduate Research

This paper presents a machine learning (ML) based design framework for the fast and accurate optimization of coreless axial flux permanent magnet (AFPM) machines. Although the absence of magnetic cores eliminates material nonlinearity, the design process remains highly nonlinear due to the complex influence of geometric parameters. To overcome the computational challenges of finite element analysis (FEA)-based optimization, a series of multi-objective differential evolution (MODE) optimizations were conducted across various machine sizes at constant power output. The resulting design data was used to train an artificial neural network (ANN), enabling rapid prediction of machine performance without the need for repeated …

Coreless Axial Flux Permanent Magnet Machines With Concentrated Coils And Various Pole/Coil Combinations, Matin Vatani, Spencer M. Goode-Kulchar, John F. Eastham, Xiaoze Pei, Dan M. Ionel

Electrical and Computer Engineering Graduate Research

This paper comprehensively analyzes coreless stator axial flux permanent magnet (AFPM) machines by investigating rotor magnetic fields, stator winding factors, and 2D/3D finite element analysis (FEA) simulations. The torque production theory in coreless AFPM machines is studied with detailed derivations for flux density and current density. The impact of rotor permanent magnet (PM) width is examined for both surface-mounted and Halbach array configurations, followed by a discussion of its influence on the air-gap harmonic spectrum. The effect of stator coil side width is analyzed through a detailed winding factor study across various pole-to-coil ratios and a discussion on the trade-off …

Voltage And Reactive Power Combined Control Of Utility Devices And Smart Inverters On A Distribution Grid With Solar Pv, Steven B. Poore, Rosemary E. Alden, Evan S. Jones, Thomas Morstyn, Aron Patrick, Dan M. Ionel

Electrical and Computer Engineering Graduate Research

With adoption of distributed energy resources (DERs) expected in future grids, voltage regulation methods need to be reevaluated and improved to ensure their effectiveness under the high volatility of renewable generation. A multi-timescale cluster-based method is proposed to optimize and disperse operation of voltage controlling utility devices including capacitor banks (CBs) and load tap changers (LTCs) while allowing faster response time with customer-owned smart inverters (SIs) in-between switching operations. The proposed method is tested on a digital twin (DT) of a very large utility distribution grid with 2,018 nodes and 8.65MW peak load to evaluate its effectiveness in future grid …

When Old Meets New: Two Louisiana State University Outreach Librarians Build, Work, And Learn Together To Support Collaborative Student Engagement, Alia Kempton, Mitch Fontenot

Faculty Publications

In this essay, outreach librarians Mitch Fontenot (he/him), Louisiana State University, and Alia Kempton (she/her), Louisiana State University, Special Collections, reflect on their inaugural year of working together, highlighting key achievements, challenges, and growth that have marked their collaborative journey. They discuss how they established effective communication, built trust, and developed a shared understanding of goals and expectations. Additionally, they explore where they envision their partnership heading in the future, touching on long-term aspirations, potential areas for deeper collaboration, and the strategies they plan to implement to continue fostering a successful and productive working relationship.

Availability Of Esg Rating Information And Voluntary Esg Disclosure: Evidence From Coverage Expansion Of Esg Rating Agency, Xuefan Peng

Dissertations and Theses Collection (Open Access)

I examine the effect of availability of ESG rating information on firms’ voluntary ESG disclosure practices. Thomson Reuters Asset4 expanded ESG rating coverage from Russell 1000 index to Russell 2000 index in 2017. Exploiting this exogenous shock of availability of ESG rating information in a difference-in-difference research design, I find that compared with Russell 1000 firms (i.e., control firms), Russell 2000 firms (i.e., treatment firms) are less likely to increase voluntary ESG disclosures. The effect is more pronounced for firms with higher disclosure costs, captured by higher level of firm complexity and lower level of digitalization, and less pronounced for …

Investigating Organisational Ethical Transgressions: A Middle Management Perspective, Belinda Kit Wah Boey

Dissertations and Theses Collection (Open Access)

This study questions how large-scale ethical transgressions persist within organisations by focusing on the pivotal yet underexamined role of middle managers. Positioned between senior leadership and frontline employees, middle managers often determine the trajectory of reported misconduct. By analysing their responses to ethical concerns raised by subordinates, the study seeks to illuminate the processes that sustain or interrupt organisational inaction.

Using grounded theory methodology, in-depth interviews were conducted with middle managers across diverse sectors. The analysis yields a typology of five distinct handling strategies: creative compliance, face-saving resolution, informal influence, formal escalation, and strategic withdrawal. …

'Only A Pawn In Their Game' Panel To Discuss Legacy Of Medgar Evers, Marisa C. Atkinson

University of Mississippi News

OXFORD, Miss. – Three threads of Mississippi and civil rights history – Medgar Evers, Bob Dylan and Jerry Mitchell – will be woven together in a public conversation Oct. 8 at the University of Mississippi.

Stochastic Modeling Of Electromagnetic Wave Propagation Through Extreme Dust Conditions In Underground Mines Using Vector Parabolic Approach, Emmanuel Atta Antwi, Samuel Frimpong, Muhammad Azeem Raza, Sanjay Madria

Mining Engineering Faculty Research & Creative Works

Post-disaster underground (UG) mine environments are characterized by complex and rapidly changing conditions, adding extra attenuation to propagating electromagnetic (EM) waves. One such complex condition is the extreme generation of dust and sudden rise in humidity contributing to extra attenuation effects to propagating waves, especially under varying airborne humidity and dust levels. The existing wave propagation prediction models, especially those that factor in the effect of dust particles, are deterministic in nature, limiting their ability to account for uncertainties, especially during emergency conditions. In this work, the vector parabolic equation (VPE) model is modified to include dust attenuation effects. Using …

Wybrane Aspekty Transformacji Klimatycznej I Energetycznej, Grzegorz Tchorek, Michał Kołtuniak

Monografie/Monographs

Monografia podejmuje aktualne zagadnienia transformacji energetycznej i zrównoważonego transportu w dobie kryzysu klimatycznego. Autorzy przedstawiają wyzwania, przed jakimi stają krajowe i lokalne władze, a także przedsiębiorcy i inne organizacje oraz wskazują szanse związane z transformacją. Wyzwania te dotyczą m.in. potrzeby dostosowań systemów elektroenergetyczny w związku z dynamicznym rozwojem odnawialnych źródeł energii, takich jak fotowoltaika, energetyka wiatrowa, wodna, biogazowa i wodorowa. Szczególną uwagę poświęcono technologiom magazynowania energii oraz lokalnym formom zarządzania produkcją i konsumpcją energii poprzez klastry i spółdzielnie energetyczne. Poruszono także zagadnienia rozwoju mobilności miejskiej oraz nowoczesne środki transportu nisko- i zeroemisyjnego, a także zagadnienia związane z ciepłownictwem oraz opracowywaniem …

Conditioning Elections: The Instability With Dynamic Voters, Lorenzo Collier

Political Science Student Papers and Posters

The stability of electoral outcomes is a cornerstone of democratic legitimacy, yet real-world elections increasingly exhibit volatility driven by dynamic voter populations and shifting preferences. By treating elections as a function f(x) where x represents voter choice, we can study the conditioning of election outcome functions under perturbations, analogous to sensitivity analysis of numerical solvers. This paper investigates the mechanisms underlying instability in elections when voters and their beliefs evolve over time, focusing on the effects of conditioning decisions on anticipated future changes. By surveying classical and contemporary models of voting rules under dynamic settings, this paper demonstrates how seemingly …

Lawrence, Fall/Winter 2025, Lawrence University

Alumni Magazines

No abstract provided.

Afit Librarian Newsletter : Check It Out (Fourth Quarter 2025), D'Azzo Research Library, Air Force Institute Of Technology

AFIT Library Knowledge Base

No abstract provided.

A Glimmer Of Light Among The Lowest Of The Low: Rev. Samuel F. Moore, Esther Hyun

Historical Missionary Biography Papers

Samuel F. Moore was an evangelical missionary who reached out to the butchers, an untouchable caste in Korea during the Joseon dynasty. Moore supported the butchers with deep care and love, following God's command in the Old Testament to care for the poor and oppressed, and following Jesus' care for the marginalized in the New Testament. Moore supported the abolition of discrimination against the butchers as an act of social redemption and evangelism. Moore was a man who never compromised the truth of the gospel and had a heart after God’s own heart, where God’s mind, gaze, and tears were …

2025 Art205 Graphic Design I Portfolio - Fall Issue, Morehead State University. Department Of Communication, Media, Art And Design.

Graphic Design Student Artwork Projects

The Fall 2025 graphic design project portfolio of professor Siriporn Peters' ART205 course.

Res Gestate 2025 Fall Issue, Lindsay Wilcox, Angela Turnbow, Austen Diamond, Lexie Kite, Violet Maw, Henry Randolph, Robert Rice, Dave Titensor, Elizabeth Kronk Warner

Law School Historical Documents

The Alumni Magazine for the S.J. Quinney College of Law, University of Utah

Campus Chronicle, Jayden Park

Campus Chronicle

Special Ankeny, Urban, Boone Issue

Ua 64/2 The Challenge: Magazine For The Center For Gifted Studies (No. 59 Fall 2025), Elizabeth Joyce Editor

Gifted Studies Publications

Magazine created by and about the WKU Center for Gifted Studies.

Instilling Primary-Source Research Confidence In Undergraduate History Majors: Insight Into Instructional Impact And Student Preferences, Matthew J. Gorzalski

Articles

Information literacy and critical thinking are arguably the most important and transferable skills undergraduate history majors develop in the course of their studies. A primary-source-based research paper is often an undergraduate history major’s capstone assignment toward graduation. Yet they often face these assignments having little or no prior experience with archival research and lack confidence in finding and using primary sources. This article reports on a study conducted during the 2022 and 2023 spring semesters at Southern Illinois University Carbondale (SIUC) involving archival literacy instruction for undergraduate history majors enrolled in HIST 392 Historical Research and Writing. It examined the …

Legal Models For Public-Private City Greening Partnerships, Daniel J. Metzger

Sabin Center for Climate Change Law

Cities are significantly hotter than their surrounding areas. That difference, known as the “urban heat island” effect, is driven in significant part by the dark-colored buildings, sidewalks, roadways, and similar surfaces that dominate urban spaces, absorbing solar energy and later radiating it outward as thermal energy that heats the nearby air. This Comment suggests and describes one avenue through which cities and local community-based organizations (CBOs) could tackle extreme heat: partnering with one another to transform paved surfaces into green or reflective ones. Partnerships of this kind could combine the resources and desire to create green spaces that nongovernmental groups …

Csbs Kudos, Fall 2025, University Of Northern Iowa. College Of Social And Behavioral Sciences.

CSBS Kudos

Contents:

--- Faculty Accolades
--- New Faculty & Staff
--- In Memoriam - Carole Edginton
--- In Memoriam - Clemens Bartollas
--- UNI names Allison Rank as inaugural director of the Center for Civic Education
--- Tradition meets tomorrow, one historic image at a time
--- Historian Serena Zabin delivered 52nd annual UNI Becker Lecture on Boston Massacre
--- UNI ROTC program to remain on campus under new U.S. Army structure
--- UNI professor starts first-of-its-kind health initiative in Iowa for retired men
--- UNI hosts third White Coat Ceremony for nursing students
--- UNI welcomes students and community to …

From Summer Institute To Action: Advancing Equity And Inclusion In Stem Classrooms, Sandie Han, Nadia Kennedy, Malgorzata Marciniak, Diana Samaroo

Publications and Research

This Editor’s Note provides background on the CUNY Innovative Teaching Academy Summer Institute for Equitable and Inclusive STEM Teaching and Learning and introduces the articles featured in this special issue.

Rats With Wings: The Villainization Of The Pigeon And Its Portrayal In Modern Art And Literature, Emily Dutton

Honors Theses

For millennia, humans have had an increasingly intimate relationship with pigeons. These birds have been called a wide range of names and served a myriad of purposes alongside their human handlers; however, since the populations of feral rock pigeons have increased in American cities, the general public has ascribed a negative connotation to the pigeons that they were once closely associated with. The increasing populations of pigeons along with their decreasing perceived usefulness to humanity has led to a sharp decline in their image. This thesis aims to examine how the pigeon became so loathed after it was coveted for …

The Trojan Women, Otterbein Theatre And Dance Department

2025-2026 Season Productions

No abstract provided.

Mary Victor And The Monster, Otterbein Theatre And Dance Department

2025-2026 Season Productions

No abstract provided.

Gender And Party Polarization In The Us Congress: Hypervisibility And Invisibility, Rosalyn Cooperman

Political Science & International Affairs Articles

The history and practice of party polarization in Congress is a gendered concept. Men have comprised the overwhelming majority of legislators from both parties, served as their party’s leaders, and dominated the party caucuses. As women and women of color have increased their presence in the institution, particularly among Democrats, gender and race have emerged as important themes in understanding party polarization in contemporary congresses. In an analysis of legislative activity of members in the 104th to the 117th Congresses, I find the two most distinct groups of partisans, Democratic women and Republican men, are prominently featured in the opposing …

Otterbein Towers Fall 2025, Otterbein University

Towers Magazine

Around the 'Bein; Innovative Funds; Committed to Career and Community; Faculty Excellence and Innovation; Two Years of Education for the Common Good; Homecoming and Family Weekend; Philanthropy; Alumni Matters; Class Notes.