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 20 for “"Self-starting"”.
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Design and Implementation of Four-quadrant Operation in Single-Switch Based Switched Reluctance Motor Drive System
… have plagued single-phase SRM: the lack of self-starting capability and restricted operation conditions. This thesis presents a four-quadrant operation SRM drive system with a single controllable switch for two phase configuration. The SRM's configuration has four main stator poles, four …
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Vertical Axis Hybrid Wind Turbine
… electricity generation and investigate the self-starting issue of VAWT. The development of sustainable energy sources has become increasingly critical in recent years because of growing worries about climate change, finite fossil fuel supplies, and the need for energy sustainability. Wind …
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Statistical monitoring of police force for rapid detection of changes in frequency
… the model. Police force data is charted using a self-starting control chart scheme. The charts assist the decision-maker in determining if intervention is necessary to correct an out-of-control condition while simultaneously minimizing unnecessary intervention when shifts in the frequency of …
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A few-cycle Cr⁴⁺:YAG laser and optical studies of photonic crystals
… reflectors were designed and used to ensure self-starting of 35 fs pulses in the ultrafast Cr4+:YAG laser or to generate picosecond pulses tunable from 1400 to 1525 nm. The mirrors were a 7-pair GaAs/AlxOy quarter-wave dielectric stack, and the absorber consisted of a InGaAs quantum well …
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Studies of third-order nonlinearities in materials and devices for ultrafast lasers
… for modulation depths ranging from 0.3% to 18%. Self-starting modelocked operation with the absorbers was achieved in a variety of lasers including Ti:Sapphire, Cr:Forsterite, Er:glass, Cr⁴⁺:YAG and erbium-doped bismuth-oxide fiber. In tapered microstructure fiber, highly nondegenerate four-wave …
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Design and Implementation of a Novel Single-Phase Switched Reluctance Motor Drive System
… have only 50% utilization of windings, lack of self-starting feature unless otherwise built in to the machine, most of the times with permanent magnets or sometimes with distinct and special machine rotor configurations or additional mechanisms. Many of these approaches are expensive or make the …
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Novel broadband light sources and pulse generation techniques at 1.5 [mu]m
… erbium-doped bismuth-oxide lasers demonstrated self-starting and stable modelocked operation. Saturable absorber mirrors were also developed for high-repetition-rate short-cavity femtosecond lasers, with modulation depths ranging from 1.7% to 11%. Post-growth proton bombardment was used to …
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Women and Men in Collaborative Working Partnerships: Connecting Two Disparate Modes of Experience
… less responsible, nurturing, detail oriented and self-starting than women. The specific work tasks required by the partnerships seemed to influence the outcomes. Recommendations based on the findings were to support mixed gender partnerships through gender awareness training, mediation, more …
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The efficacy of personal initiative training for academic and career success as a stress management intervention for university students
… potential intervention, arguing that fostering a self-starting, future-oriented mindset may enhance stress resilience. Grounded in Action Regulation Theory and the Transactional Model of Stress, this study examines whether PI training reduces perceived distress and increases self-efficacy among …
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Development and application of saturable absorbers to femtosecond solid-state laser mode-locking
… of both types of saturable absorbers to self-starting mode-locking in solid-state lasers was examined. The first part of this thesis describes the use of an epitaxially grown saturable Bragg reflector to mode-lock an extended cavity femtosecond Cr:LiSAF laser. Inexpensive single mode …
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Variable-Speed Switched Reluctance Motor Drives for Low-Cost, High-Volume Applications
… and an asymmetric two-phase 8/4 SRM capable of self-starting and four-quadrant operation. The second drive system is realized using another novel converter requiring two controllable switches, that way to achieve better control and utilization of the asymmetric 8/4 motor. The target applications …
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SELF-REPRESENTATIONS IN BREAST CANCER PATIENTS AND SURVIVORS: BODY IMAGE, INJURED SELF, AND AVAILABLE PSYCHOLOGICAL INTERVENTIONS
In recent years, research on the Self has burgeoned in the psychological field; however, knowledge gaps still exist because most studies have failed to acknowledge the multidimensional nature of self-representations in breast cancer patients and survivors. My Ph.D. thesis focuses on the impact of …
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When beginning mathematics teachers report acquiring successful attributes: Reflections on teacher education
… discussed as developing pre-program: being a self-starting and hard-working individual, and holding a belief that every student can learn. Beginning teachers viewed these traits as important for their success. Participants also felt that they acquired both practical classroom tools and …
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Design and Implementation of a Novel Control System for Four Quadrant Operation of a Two-Phase Switched Reluctance Motor
… in all four quadrants, and is to demonstrate self starting capability. The controller is also supposed to produce signals needed to operate the motor with multiple converter designs. Two different converter designs will be built and tested with the converter. One makes use of a single switch …
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Energy storage systems for wave energy converters and microgrids
… then explored. These include start-up of the non-self-starting Wells turbine, and low-voltage ride-through examined to the limits specified in the Irish grid code for wind turbines. These applications are investigated with a more complete model of the system that includes a detailed back-to-back …
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Magnetically suspended reaction sphere with one-axis hysteresis drive
… its advantages of simple structure, moderate self-starting toque, and vibration-free operation. The hysteresis motor in 1D-MSRS consists of a conventional stator arranged on the sphere's equator and a spherical rotor of magnetically hard steel. In this thesis, an equivalent circuit model of …
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The Impact of Institutional Rules on the U.S. Supreme Court
… Supreme Court The U.S. Supreme Court is not a self-starting institution; it must wait for issues to come to it before deciding them. The Court’s certiorari process is, however, a powerful device that provides justices with full discretion over cases they hear and which individual questions …
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Aerodynamic Enhancement and Reduced Order Modeling of Vertical Axis Wind Turbines
… deflector implementation boosts the DRSBVAWT self starting capabilities and enhances overall performance. With a vertical deflector (β = 0◦from the y-axis) yields the best performance, providing the highest efficiency and power output. In contrast, a horizontal deflector (angle of β = 90◦ …
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Design and investigation of the emission dynamics of a mode-locked SBS-laser oscillator
… adjusted by tuning the pump parameters and the starting conditions for the laser. Another feature of the SBS-reflection is phase conjugation, which leads to an excellent beam quality thanks to the compensation of phase distortions. Transverse fundamental mode operation and a beam quality better …