Open Access. Powered by Scholars. Published by Universities.®
- Discipline
-
- Social and Behavioral Sciences (659683)
- Arts and Humanities (574445)
- Law (544751)
- Education (383013)
- Medicine and Health Sciences (326404)
-
- Physical Sciences and Mathematics (293293)
- Life Sciences (256699)
- Engineering (196980)
- History (181868)
- Business (149637)
- Higher Education (142979)
- Anthropology (116009)
- Religion (110064)
- Archaeological Anthropology (96470)
- Communication (89235)
- Sociology (87084)
- Library and Information Science (79647)
- United States History (77766)
- Medical Specialties (77228)
- Psychology (73848)
- Computer Sciences (63287)
- Public Affairs, Public Policy and Public Administration (63114)
- Earth Sciences (59424)
- Creative Writing (57936)
- Public Health (55715)
- Environmental Sciences (52528)
- English Language and Literature (47596)
- Economics (47329)
- Educational Administration and Supervision (46557)
- Music (46015)
- Institution
-
- University of South Florida (163081)
- University of New Mexico (139586)
- University of Nebraska - Lincoln (114036)
- Kenyon College (112891)
- University of Montana (98531)
-
- University of Mississippi (94772)
- University of New Hampshire (79684)
- Brigham Young University (72250)
- Georgia Southern University (61632)
- Eastern Illinois University (57898)
- Utah State University (57413)
- Mississippi State University (54647)
- Western Michigan University (53031)
- University of Kentucky (52443)
- Murray State University (50649)
- Purdue University (50110)
- University of Colorado Law School (47486)
- Louisiana State University (45176)
- Brigham Young University Law School (43875)
- University of Dayton (43242)
- Western Kentucky University (43085)
- Villanova University Charles Widger School of Law (42801)
- California Polytechnic State University, San Luis Obispo (42542)
- University of Central Florida (41689)
- Chulalongkorn University (37685)
- San Jose State University (37101)
- University of Alabama at Birmingham (36199)
- University of Northern Iowa (35977)
- Yale University (33873)
- Missouri University of Science and Technology (33648)
- Keyword
-
- Newspaper (47934)
- Latin America (31535)
- Press release; media release; press statement; news media information (30839)
- Spanish (30834)
- History (29979)
-
- University of New Mexico (29736)
- Humans (29669)
- UNM (29639)
- LADB (29608)
- LAII (29608)
- Latin American and Iberian Institute (29608)
- Education (29012)
- United States (21476)
- Student newspaper (20016)
- Newsletter (19711)
- EIU (19630)
- Georgia Southern University (18972)
- Newspapers (18264)
- Deaf culture (17102)
- Hearing impaired (17091)
- Pastoral care of people with disabilities (17060)
- Church work with the deaf -- Catholic Church (17052)
- Deaf -- Periodicals (17043)
- Athletics (16852)
- Marriage (16187)
- Poetry (15526)
- Students (15144)
- Higher education (14617)
- COVID-19 (14416)
- Female (14368)
- Publication Year
-
- 2026 (108944)
- 2025 (157332)
- 2024 (193375)
- 2023 (163308)
- 2022 (167974)
-
- 2021 (195967)
- 2020 (169362)
- 2019 (165417)
- 2018 (170125)
- 2017 (160930)
- 2016 (159565)
- 2015 (146320)
- 2014 (135717)
- 2013 (130047)
- 2012 (124711)
- 2011 (108261)
- 2010 (103650)
- 2009 (95733)
- 2008 (92796)
- 2007 (79245)
- 2006 (74598)
- 2005 (70192)
- 2004 (71348)
- 2003 (58780)
- 2002 (64561)
- 2001 (55121)
- 2000 (58539)
- 1996 (62314)
- 1992 (53036)
- 1990 (53686)
- Publication
-
- Four Valleys Archive (90475)
- Theses and Dissertations (74096)
- Faculty Publications (45784)
- Electronic Theses and Dissertations (35655)
- University of Montana News Releases, 1928, 1956-present (30911)
-
- Faculty Scholarship (25435)
- Dissertations (23771)
- The Auk (22791)
- Documents (21845)
- Theses (21719)
- Articles (20102)
- Walden Dissertations and Doctoral Studies (19630)
- Browse All News (19555)
- Masters Theses (18653)
- Master's Theses (18439)
- Chulalongkorn University Theses and Dissertations (Chula ETD) (15281)
- Session Laws 1951-2000 (15051)
- NotiSur (13785)
- Faculty, Staff and Student Publications (13699)
- Hillsborough County Marriage Records (13681)
- University of Mississippi News (13497)
- Obituaries (13320)
- The Murray Ledger & Times (13003)
- Sheet Music Collection (12976)
- Michigan Law Review (12807)
- University of Montana Course Syllabi (12469)
- Honors Theses (12182)
- Defensive Publications Series (12008)
- Graduate Theses, Dissertations, and Problem Reports (ETD) (11969)
- Condor (11821)
- Publication Type
Articles 246661 - 246690 of 5166812
Full-Text Articles in Entire DC Network
Belonging, Inclusivity, And Educational Outcomes: A Quantitative Subgroup Analysis Of School Climate, Academic Performance, And Graduation Rates, Au'yana Lee
Murray State Theses and Dissertations
National graduation rates have improved over time; however, persistent disparities reveal that prior reform efforts have not fully addressed the relational and cultural dimensions that shape student experiences. The study examines how students from historically marginalized groups perceive the school climate, inclusivity, and sense of belonging, and how these perceptions relate to their academic performance and on-time graduation. Grounded in the Life Course Perspective, Expectancy-Value Theory, and Social Capital Theory, this study conceptualizes belonging, motivation, and support as interconnected factors that influence students’ educational trajectories. Using a quantitative correlational design, this study examines the associations between students’ perceptions of school …
The Evolution Of Veterinary Technology Education: Growth, Accreditation, And The Role Of Murray State University’S Veterinary Technology Program, Tara Joiner
Murray State Theses and Dissertations
This dissertation examines the evolution of veterinary technology education, focusing on the growth, accreditation, and role of Murray State University’s (MSU) veterinary technology program. The veterinary profession has experienced significant advancement and expansion in recent years. The American Veterinary Medical Association (AVMA) accredits veterinary technology programs, setting standards and conducting reviews to ensure quality. Murray State University’s veterinary technology program, accredited by the AVMA in 1986, prepares students for the Veterinary Technology National Exam (VTNE) through a comprehensive curriculum and internships (practical experience). Findings from a three-year period (2022–2024) highlight mentor confidence in student readiness at 77.3%, with qualitative feedback …
Examining Kentucky Agriculture Teachers’ Use Of Student Credentialing In Agricultural Education Programming, Kaycee J. Palmeri, Kevin T. Wells
Examining Kentucky Agriculture Teachers’ Use Of Student Credentialing In Agricultural Education Programming, Kaycee J. Palmeri, Kevin T. Wells
Murray State Theses and Dissertations
The purpose of this qualitative study was to explore Kentucky agriculture teachers’ perceptions regarding current industry credential offerings, how they operationalize the curricula, knowledge, and skills necessary to prepare for industry credential offerings, and the perceived benefits for students who earn such credentials. The current study was undergirded by human capital theory. Using random sampling across the 12 Kentucky FFA service regions, the researcher collected data from nine current Kentucky agriculture teachers via semi-structured interviews. Further, the researcher used a Qualtrics-based instrument to collect participant demographics data. The analysis of the interview data revealed eight distinct emerging themes. The researcher …
How Did The Covid-19 Pandemic Affect The Educational Level Of Students, Measured By The Act?, Davey A. Reed, Davey A. Reed
How Did The Covid-19 Pandemic Affect The Educational Level Of Students, Measured By The Act?, Davey A. Reed, Davey A. Reed
Murray State Theses and Dissertations
This study examined the relationship between socioeconomic status (SES), chronic absenteeism, and ACT performance among Alabama’s 4A public high schools, with a particular focus on how these factors evolved before and after the COVID-19 pandemic. Utilizing a longitudinal design, the research examined data from four academic years: 2019 (pre-COVID) and 2022, 2023, and 2024 (post-COVID). Data were obtained from the Alabama State Department of Education’s public report card portal and included ACT composite scores, school-level SES data, and chronic absenteeism rates. Schools were anonymized to ensure confidentiality and grouped into SES categories (Low, Mid, High) for comparative analysis. A combination …
The Geography Of Care: Rural Versus Urban Caregiver Perspectives On Community Resources For Parkinson’S Disease Management, Rebecca Jones
The Geography Of Care: Rural Versus Urban Caregiver Perspectives On Community Resources For Parkinson’S Disease Management, Rebecca Jones
Murray State Theses and Dissertations
This qualitative study investigated the experiences and perceptions of caregivers for individuals with Parkinson's disease (PD) in rural versus urban settings, with particular emphasis on their access to and utilization of community resources. Through semi-structured interviews with 30 caregivers, the research explored how geographical location impacts caregiving challenges, support systems, and resource accessibility. Using Andersen's Behavioral Model of Health Services Use as a theoretical framework, the study revealed both universal caregiving challenges and location-specific barriers. While all caregivers reported significant emotional burden and healthcare system navigation difficulties, rural caregivers faced distinct challenges related to resource accessibility and specialized care availability. …
Spatial Analysis Of American Chestnut (Castanea Dentata) Distribution And Ecology In Kentucky’S Federal Lands, Jacob Raymond Pease
Spatial Analysis Of American Chestnut (Castanea Dentata) Distribution And Ecology In Kentucky’S Federal Lands, Jacob Raymond Pease
Murray State Theses and Dissertations
Anthropogenic factors have been the cause of the decline of tree species across the globe. From unsustainable logging and development to disease and improper management, threats to forests have taken their toll. The American chestnut (Castanea dentata) was once an integral basal tree species in Appalachian forests, but chestnut blight drove the species to functional extinction by the mid-1900s. The recent creation of genetically modified chestnuts gives hope for future restoration of the species throughout its historical range. Despite blight resistance, effective restoration will require optimal site selection for finding and planting chestnuts, which will maximize limited resources. …
An Examination Of Middle School Enrollment And Participation In The National Ffa Organization, Melanie Dorminey
An Examination Of Middle School Enrollment And Participation In The National Ffa Organization, Melanie Dorminey
Murray State Theses and Dissertations
Middle school agricultural education programs and opportunities for middle school students to be members of the National FFA Organization were first made available in 1988. The Perkins V Act of 2018 provided the first federal funding to support middle school career and technical education programs. In conjunction with the federal funding provided by the Perkins V Act of 2018, the National FFA Organization adopted a national middle school membership affiliation program where middle school FFA chapters could pay a flat fee for all students enrolled in middle school agricultural education courses over the traditional membership of paying per individual student. …
The Equitability Of Virtual Public High School Education In Urban School District, Carissa Jury
The Equitability Of Virtual Public High School Education In Urban School District, Carissa Jury
Murray State Theses and Dissertations
Virtual education has become an integral component of modern high school education, particularly in urban districts where diverse student populations require flexible and equitable learning environments. This qualitative study explores the equitability of virtual public high school education in an urban school district, focusing on accessibility, student experiences, and policy implications. Using social constructivism and ecological systems' theory as theoretical frameworks, this research investigates factors influencing equitable outcomes, including access to technology, teacher and community support, and socioeconomic status. Data was collected through structured interviews and focus groups with students and parents engaged in virtual education. Key findings indicate that …
Understanding The Experiences Of Online Learners In Postsecondary Education: A Phenomenological Study, Tara Woyton
Understanding The Experiences Of Online Learners In Postsecondary Education: A Phenomenological Study, Tara Woyton
Murray State Theses and Dissertations
Online education has expanded access to postsecondary education learning opportunities, yet attrition rates remain disproportionately high compared to traditional, in-person education. This phenomenological study explores the lived experiences of seven students who did not persist in their online education at a postsecondary institution, with the goal of identifying barriers to retention and potential strategies for improvement. The study applies Expectancy-Value Theory as a theoretical framework, examining how students’ expectancy beliefs, perceived task value, and perceived costs influenced their motivation and lack of persistence in online learning environments. Using qualitative data collection methods, including questionnaires and in-depth interviews, this study …
Factors Influencing Former State Ffa Officers To Forego Careers In Agriculture: A Qualitative Study, Shelby R. Atwood
Factors Influencing Former State Ffa Officers To Forego Careers In Agriculture: A Qualitative Study, Shelby R. Atwood
Murray State Theses and Dissertations
This qualitative study explores the factors influencing former State FFA Officers' decisions to pursue careers outside agricultural education and the broader agricultural industry. Despite their deep engagement with the National FFA Organization and exposure to numerous agricultural career opportunities, many former officers do not transition into related professions. Guided by the expectancy-value theory, this research investigates the personal experiences, perceptions, and external factors that shape their career choices. Data was collected through semi-structured interviews with former Kentucky State FFA Officers, focusing on their motivations, barriers, and overall perspectives on agricultural careers. Key findings revealed that practical considerations, personal growth, leadership …
Identifying The Agricultural Mechanics Knowledge And Skills Needed By Kentucky Agriculture Teachers, Thomas Poole Jr
Identifying The Agricultural Mechanics Knowledge And Skills Needed By Kentucky Agriculture Teachers, Thomas Poole Jr
Murray State Theses and Dissertations
The agricultural industry increasingly relies on complex machinery and technology, creating a need for skilled workers that are proficient in agricultural mechanics. School-based Agricultural Education (SBAE) programs play a crucial role in preparing students for careers in this field. However, many agriculture teachers feel unprepared to teach agricultural mechanics due to gaps in technical skills, self-efficacy concerns, and safety considerations. This study sought to determine the agricultural mechanics knowledge and skills that Kentucky agriculture teachers need to successfully teach agricultural mechanics in SBAE programs across the state. Using Wells et al.'s (2021) Agricultural Teacher Education and Agricultural Industry Partnership Model …
Assessing The Behavioral And Health Effects Of Turtle Racing On Eastern Box Turtles (Terrapene Carolina Carolina), Michelle Weaver
Assessing The Behavioral And Health Effects Of Turtle Racing On Eastern Box Turtles (Terrapene Carolina Carolina), Michelle Weaver
Murray State Theses and Dissertations
To make informed management decisions regarding box turtles (Terrapene spp.) and other turtle species, one must understand what influences them at multiple levels of biological organization. Common influences include the pet trade, urbanization, habitat degradation, and disease. One factor that has not been studied but could influence turtles at multiple levels of biological organization is turtle racing. It is common practice to use wild caught turtles at these events because there is a lack of regulation and enforcement. My study focused on evaluating the effects of turtle racing on eastern box turtles (Terrapene carolina carolina; hereafter EBTs) …
Strong Neighborhood-Prime Labelings Under Ordinary & Gaussian Integers, Micheal Arnal-Brown
Strong Neighborhood-Prime Labelings Under Ordinary & Gaussian Integers, Micheal Arnal-Brown
Murray State Theses and Dissertations
This thesis introduces and studies the notion of a strong neighborhood-prime labeling, a strengthening of the neighborhood-prime labeling where the label 1 can be assigned to any vertex in a graph. We prove that several graph families—including paths, cycles (excluding those congruent to 2 modulo 4), caterpillars, helm graphs, closed helm graphs, gear graphs, and graphs with universal vertices—admit such labelings, and also provide results to more general classes of graphs. We extend this new labeling concept to the Gaussian integers using a spiral order- ing on Z[i] and define a Gaussian analogue of strongly neighborhood-primeness. To support this extension, …
Christian Educational Ministry, Michael Knight, Lizette Knight
Christian Educational Ministry, Michael Knight, Lizette Knight
Academic Books
No abstract provided.
Transcript Of Commencement Speech Of Honorary Degree Speaker Keith Ellison Delivered At The 2025 Suffolk University Law School Commencement Ceremony, Keith Ellison
Suffolk University Commencements
No abstract provided.
2025 Suffolk University Commencement Program, College Of Arts & Sciences And Sawyer Business School, Suffolk University
2025 Suffolk University Commencement Program, College Of Arts & Sciences And Sawyer Business School, Suffolk University
Suffolk University Commencements
Suffolk University commencement programs detail the location, date, order of exercises, academic honors, speakers, administration, graduates, and other related information.
Transcript Of Commencement Speech Of Student Speaker Laura Martins Delivered At The 2025 Suffolk University Law School Commencement Ceremony, Laura Martins
Suffolk University Commencements
No abstract provided.
Transcript Of Commencement Speech Of Graduate Speaker Christin Marie Santiago Delivered At The 2025 Suffolk University Business School Commencement Ceremony, Christin Marie Santiago
Transcript Of Commencement Speech Of Graduate Speaker Christin Marie Santiago Delivered At The 2025 Suffolk University Business School Commencement Ceremony, Christin Marie Santiago
Suffolk University Commencements
No abstract provided.
Transcript Of Commencement Speech Of Undergraduate Speaker Derek Wayne Goodwin Delivered At The 2025 Suffolk University Business School Commencement Ceremony, Derek Wayne Goodwin
Transcript Of Commencement Speech Of Undergraduate Speaker Derek Wayne Goodwin Delivered At The 2025 Suffolk University Business School Commencement Ceremony, Derek Wayne Goodwin
Suffolk University Commencements
No abstract provided.
Transcript Of Commencement Speech Of Honorary Degree Speaker John Fernandez, Hdcs ’25 Delivered At The 2025 Suffolk University Business School Commencement Ceremony, John Fernandez
Suffolk University Commencements
No abstract provided.
The Impact Of Using Artificial Intelligence (Ai) On Employer Branding, Doaa Ayoub, Sherine Fathy El-Fekey, Malak Walid
The Impact Of Using Artificial Intelligence (Ai) On Employer Branding, Doaa Ayoub, Sherine Fathy El-Fekey, Malak Walid
Business Administration
Artificial Intelligence (AI) is revolutionizing Human Resource Management, enhancing efficiency, accuracy, and strategic capabilities as companies want to stay competitive in the global market. In recent years, AI has transformed numerous facets of business operations, especially in the development of employers’ branding strategies. Additionally, one-third (36%) of HR professionals anticipate a high use of AI in the next two years, while 61% expect at least moderate use within a year. AI enhances employers’ branding - fostering a work culture that attracts and retains top talent in the global market. Furthermore, the contribution of AI in improving employers’ branding strategies has …
The Impact Of Key Audit Matters On Earnings Quality: The Moderating Role Of Ownership Structure In Egyptian Listed Companies., Dina Hassouna, Rasha Elhaddad, Rasha Elbolok
The Impact Of Key Audit Matters On Earnings Quality: The Moderating Role Of Ownership Structure In Egyptian Listed Companies., Dina Hassouna, Rasha Elhaddad, Rasha Elbolok
Business Administration
This study investigates the influence of key audit matters (KAMs) on earnings quality, measured by earnings per share (EPS), in Egyptian listed companies, with a particular focus on the moderating role of ownership structure. To address potential endogeneity concerns, the study employs the generalized method of moments (GMM) for panel data analysis. The findings indicate that KAM disclosures have a significant negative impact on EPS, suggesting that increased disclosure of critical audit matters is associated with a decline in earnings quality. However, this relationship is moderated by ownership structure, as concentrated ownership helps mitigate the adverse effects of KAMs on …
Imputation Methods Based On Cluster‑Wise Linear Regression: A Mathematical Programming, Ahmed M. Gad Prof, Mahmoud Mostafa Rashwan, Nouran M. Tawheed
Imputation Methods Based On Cluster‑Wise Linear Regression: A Mathematical Programming, Ahmed M. Gad Prof, Mahmoud Mostafa Rashwan, Nouran M. Tawheed
Business Administration
In some applications, datasets may form several homogeneous clusters with respect to the relationship between the explanatory variables and the response variable. The presence of missing values in such datasets requires the use of two or more regression models subjected to a single objective function, which best summarizes the structure of the dataset, for imputing the missing values. This can be done using the cluster-wise linear regression model. The cluster-wise linear regression model is estimated through a mathematical programming approach based on the available data. Three imputation methods based on cluster-wise linear regression are used in this article. They are …
Comparative Study Of Single Imputation Techniques For The Prediction Of Missing Dairy Data, Ahmed M. Gad Prof, Ahmed Abdelhakim Ahmed Mr, Eman Manaa Prof, Basant Shafik Dr, Sakr Mostafa Prof
Comparative Study Of Single Imputation Techniques For The Prediction Of Missing Dairy Data, Ahmed M. Gad Prof, Ahmed Abdelhakim Ahmed Mr, Eman Manaa Prof, Basant Shafik Dr, Sakr Mostafa Prof
Business Administration
Dairy farm records are a crucial component of effective livestock business management. Record analysis allows a farm’s owner to make informed decisions. Incomplete records are less useful for data analysis, so it's important to handle missing values correctly. This study compares different imputation methods for handling missing values in a dataset of dairy records comprising 997 records collected from 234 cows between 2012 and 2022. The dataset was screened against records with missing values and then deleted, resulting in 858 observations from 200 animals. There were missing values in two variables, with a missing percentage of 13.9%: days in milk …
A New Robust Imputation Method For Longitudinal Data With Non-Normal Continuous Outcomes, Ahmed M. Gad Prof, Yasmie A. Mohamed, Nesma M. Daewish Dr, Abdelnaser S. Abdrabou Prof, Wafaa M. Ibrahim Dr
A New Robust Imputation Method For Longitudinal Data With Non-Normal Continuous Outcomes, Ahmed M. Gad Prof, Yasmie A. Mohamed, Nesma M. Daewish Dr, Abdelnaser S. Abdrabou Prof, Wafaa M. Ibrahim Dr
Business Administration
Missing values is very common in longitudinal data and it is the main challenge in analysis of longitudinal data. Missing values have a significant effect on longitudinal data analysis because they lead to loss of information, biased estimates, and misleading results. In practice there is a need for an imputation method to deal with missing values.
Aim: In this study a new robust regression-based imputation method to deal with missing values in longitudinal data is proposed. This method utilizes the modified adaptive linear regression model and does not require the normality of the responses. It is a novel robust imputation …
Axial Flux Permanent Magnet Generators For Direct-Drive Wind Turbines - Review And Optimal Design Studies, Matin Vatani, Ali Mohammadi, Donovin D. Lewis, John F. Eastham, Dan M. Ionel
Axial Flux Permanent Magnet Generators For Direct-Drive Wind Turbines - Review And Optimal Design Studies, Matin Vatani, Ali Mohammadi, Donovin D. Lewis, John F. Eastham, Dan M. Ionel
Electrical and Computer Engineering Graduate Research
This paper presents a comprehensive analysis of the feasibility, cost, and electromagnetic performance of five distinct types of axial flux permanent magnet (AFPM) generators designed for direct-drive wind turbines. The generator configurations investigated include a single-sided AFPM generator with a surface-mounted PM rotor (AFPMG), a double-sided AFPM generator featuring PMs on the stator and a reluctance rotor (AFPMG-RR), a coreless stator AFPM generator with surface PMs (CAFPMG-SPM), and a coreless stator AFPM generator with a Halbach PM array rotor (CAFPMG-Hal). Each generator’s operating principles and configurations are thoroughly explained and compared. Large-scale multi-objective design optimizations were conducted on each type, …
Review Of Coreless Axial Flux Permanent Magnet Machines With Applications Including Electric Aircraft Propulsion, Matin Vatani, Donovin D. Lewis, John F. Eastham, Dan M. Ionel
Review Of Coreless Axial Flux Permanent Magnet Machines With Applications Including Electric Aircraft Propulsion, Matin Vatani, Donovin D. Lewis, John F. Eastham, Dan M. Ionel
Electrical and Computer Engineering Graduate Research
Axial flux permanent magnet (AFPM) machines with entirely or stator coreless configurations offer significant advantages, including low rotational losses, the absence of cogging torque, minimal torque ripple, and the potential for high specific power density. Advances in permanent magnet (PM) technology and cooling techniques have enabled fully coreless AFPM machines to achieve high magnetic and current loadings without core saturation, making them suitable for high performance applications like electric aircraft propulsion. This paper reviews recent advancements in coreless AFPM machines, tracing their historical and chronological development. Various topologies, including single- and double-sided and multi-disk designs, are examined to identify the …
Speed Variation Based Power Regulation Concept For Dynamic Wireless Charging, Donovin D. Lewis, Sudarshan T. Harave, Omer Onar, Mostak Mohammad, Veda Prakash Galigekere, Gui-Jia Su, Dan Ionel
Speed Variation Based Power Regulation Concept For Dynamic Wireless Charging, Donovin D. Lewis, Sudarshan T. Harave, Omer Onar, Mostak Mohammad, Veda Prakash Galigekere, Gui-Jia Su, Dan Ionel
Electrical and Computer Engineering Graduate Research
On-road wireless charging of electric vehicles (EVs) in-motion could potentially reduce range anxiety or battery size with wide-spread deployment. The planning and implementation of such systems are greatly complicated due to their susceptibility to load variation inherent to traffic flow. This paper proposes a method for derisking the potential for traffic slowdowns by compensating for reduced vehicle speed and investigates how implementation may affect system performance. A load modeling case study is presented at 200kW for a mile of high-speed roadway employing speed-based power regulation with results indicating average power usage and maximum car hosting capability can be reduced by …
Fault-Tolerant High-Power Two-Phase Coreless Afpm Motor-Drive System Concept, Yaser Chulaee, Ali Mohammadi, Matin Vatani, Aaron M. Cramer, Dan M. Ionel
Fault-Tolerant High-Power Two-Phase Coreless Afpm Motor-Drive System Concept, Yaser Chulaee, Ali Mohammadi, Matin Vatani, Aaron M. Cramer, Dan M. Ionel
Electrical and Computer Engineering Graduate Research
This paper proposes a fault-tolerant, high-power two-phase coreless axial flux permanent magnet (AFPM) motor drive system concept. Initially, the performance of a two-phase variant of the coreless AFPM machine is compared with that of its three-phase counterpart using both 3D finite element analysis (FEA) and experiments. Thanks to the intrinsic unique features of coreless AFPM machines, the analysis of the results demonstrates that the two-phase configuration has comparable power density (kW/kg) and efficiency. In terms of fault tolerance, the two-phase configuration exhibits superior performance, as the mutual inductance between phases is zero, resulting in an electric machine with magnetically decoupled …
Two-Level Multi-Objective Design Optimization Including Torque Ripple Minimization For Stator Excited Synchronous And Flux Switching Machines, Ali Mohammadi, Oluwaseun A. Badewa, Yaser Chulaee, Dan M. Ionel
Two-Level Multi-Objective Design Optimization Including Torque Ripple Minimization For Stator Excited Synchronous And Flux Switching Machines, Ali Mohammadi, Oluwaseun A. Badewa, Yaser Chulaee, Dan M. Ionel
Electrical and Computer Engineering Graduate Research
Electric machine performance can be enhanced through torque ripple mitigation, which reduces mechanical vibrations and improves system stability and operation. This paper proposes a novel two-level optimization method for synchronous flux-switching and hybrid excitation machines, featuring an innovative multi-point spline shaping approach for torque ripple minimization. The study employs experimentally validated models based on a prototype with a similar topology. The optimization process is implemented on two distinct designs: a 20-pole inner rotor PM-excited stator machine and a 28-pole outer rotor DC-excited stator machine. Analysis results demonstrate that the proposed innovative method significantly reduces torque ripple in both configurations. Force …