Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 44 for “"Six Phase"”.
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Transient analysis of six-phase synchronous machines
Six-phase synchronous machines have been used in the past for high power generation, and presently are being used in high power electric drives and in ac and/or dc power supplies. This thesis presents a mathematical model for investigating the transient performance of a six-phase synchronous …
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PWM Techniques for Control of Dual-Inverter Supplied Six-Phase Drives
Among the different multiphase ac drive solutions, one of the most widely reported in the literature is the six-phase machine. The machines can be realised into two different configurations, symmetrical and asymmetrical. For the symmetrical configuration, the stator winding consists of two sets of …
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The six phase rectifier as a power source for operating DC motors
… adverse effects on the test motor result from six phase rectifier operation, The efficiency was unaffected by rectifier operation, The temperature rise with rectifier operation was roughly within 5°C of that obtained with DC generator input, The commutation was not adversely affected when using …
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Exploring opportunities for children’s creativity and imagination in ‘real world’ and ‘fantasy’ play in the Reception setting.
… research sub-questions are addressed through a six-phase approach which consists of document analysis, semi-structured interviews, field notes, the Leuven involvement scale, a focus group, general scoping survey and non-participant video observations. Within the six- phase approach three early …
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A novel concept of series connected multi-phase, multi-motor drive systems
… The first one consists of a number of three-phase voltage source inverters (VSI) connected in parallel to a common DC link, each inverter feeding a three-phase AC motor. This configuration allows independent control of all machines by means of their own three-phase VSIs. The second method …
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An examination of leadership approaches in Alcoholics Anonymous as perceived by its members
… in the organization's practices. Applying the six-phase reflexive thematic analysis by (2006), this study identified themes such as Sponsorship as Leadership, Sobriety Length as Leadership, Community as Leadership, and Service as Leadership. The findings offer valuable insights into …
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A Formative Experiment Investigating the Use of Reflective Video Journals to Increase High School Students' Metacognition
… this pedagogical goal, this study followed the six-phase methodology of a formative experiment. Twelve high school students participated in a six- session after-school reflective video journaling program. Diverse data collection methods were used to determine the factors in the educational …
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PERMANENT MAGNET MULTIPHASE MACHINE MODELING AND CONTROL FOR MV WIND ENERGY APPLICATIONS
… isolate the machine from the grid, the number of phases on both sides no longer needs to be the same, thus allowing for use of multiphase machines. Several studies have shown that multiphase machines can yield lower torque ripple, provide higher torque per phase current, and that they can continue …
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Relationship between methods of training and levels of intelligence
… experimental design was used in a six phase experiment; assessment of possession of conservation concepts through the aid of Piagetian tasks of conservation of substance, weight, number and length; assessment of intelligence with the aid of the New South African Individual Scale; …
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Artificial Intelligence in 2024: A Thematic Analysis of Media Coverage
… thematic analysis grounded in Braun and Clarke's six-phase procedure, 300 randomly-selected articles (100 per outlet) were analyzed and interpreted as media frames. Eight dominant frames emerged: AI Boom vs. Bubble, Misuse and Misinformation, Ethical and Moral Challenges, Policy and Governance, …
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Independent power flow control of multiple energy sources using a single electric machine
… electric machine with a multitude of three-phase winding sets has been investigated. These machines are highly suitable for high power and critical applications. Additionally, these machines utilise the well-established three-phase power electronics technologies. The interest towards …
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Church Organizational Culture: Construct Definition and Instrument Development
… accomplish this goal, the researcher undertook a six-phase, mixed-methods study following accepted protocols for construct validation. The six phases of this research study included precedent literature review; expert panel; modified Delphi study; instrument design; statistical analysis; and …
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An Integrative Literature Review of Self-Directed Learning in Higher Education
… for a highly self-directed learner. This is a six-phase study, including: 1) problem formulation; 2) data collection; 3) problem re-formulation; 4) data evaluation; 5) data collection; and 6) presentation of the findings. This study provided a comprehensive perspective of self-directed learning …
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Development of control techniques for direct AC‐AC matrix converter fed multiphase multi‐motor drive system
… The first one consists of a number of three‐phase voltage source inverters connected in parallel to a common DC link, each inverter feeding a three‐phase AC motor. This configuration allows independent control of all machines by means of their own three‐phase voltage source inverters (VSIs). …
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Professional Associations as Communities of Practice for Novice Instructional Designers: An Integrative Review
… integrative review methodology that includes a six-phase design process: formulating a broad purpose and/or review question(s), systematically searching the literature using predetermined criteria, critically appraising selected research, analyzing and synthesizing literature, discussing new …
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Clinical reasoning of clinicians and undergraduate physiotherapy students during the intensive care unit rotation
… The data was analysed using Braun and Clarke’s six-phase thematic analysis approach where various themes and sub-themes emerged from the data.
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Awareness and attitudes of adolescents towards the use of intrauterine device in Makhado Local Municipality, South Africa
… collect in-depth data. Data was analysed using six-phase guide thematic analysis. Trustworthiness was ensured by observing credibility, dependability, transferability, and conformability. Ethical principles were considered to safeguard the rights and well-being of participants. The findings of …
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Information Seeking in a Virtual Learning Environment
… the stages indicated by the ISP Model. The six-phase ISP Model is shown to be valid for describing the different stages of cognitive, affective, and physical tasks individuals progress through when facing a situation where they must search for information to complete an academic task in a …
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Student Perspectives on Interdisciplinary Skill Building, Equity and Empowerment through Arts Education and Technology During a Pandemic
… to the use of technology (Strycker, 2020). Sixteen students participated in a peer focus group in which they developed, reflected upon, and then co-critiqued an art project that evolved through a six-phase process, and two faculty members were interviewed on how the arts impact education …
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An Examination of Urban, Minority Parents’ Perceptions of Barriers Faced in Being Involved in School-Based Events in Early Childhood Education
… in the southwestern United States. Using a six-phase thematic analysis process facilitated by NVivo software, the study identified five primary thematic clusters of barriers: Occupational Rigidity, Linguistic and Intergenerational Alienation, Institutional Information Gaps, Logistical and …
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