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 80 for “"dual-mode"”.
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A dual mode pulsed electro-magnetic cell stimulator
This thesis presents the design and test of a dual-modality cell stimulator. The stimulator generates pulsing electric and magnetic fields at programmable rates and intensities. The target application is the stimulation of bone and muscle cells. While electric and magnetic stimulators have been …
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Analysis of a dual mode forward/flyback converter
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1982.
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A combined cycle approach to dual-mode scramjet design and analysis
… processes in these flows, they elude adequate modeling due to the complexities and coupling of the phenomena present and the difficulty in reproducing relevant flows in current ground test facilities. Flight testing is a crucial phase in the comprehensive study of hypersonic and …
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Bragg grating sensor interrogation using in-line, dual-mode fiber demodulators
… compared and a novel interrogation system using dual-mode optical fiber as an intensity-based demodulator is proposed. The modal birefringence of the dual-mode fiber is wavelength dependent and therefore, the modal phase relationship changes as a function of the Bragg grating reflected …
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Implementation of a demonstration dual-mode transportation system in an urban center,
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1971.
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An Experimental Study of Soot Formation in Dual Mode Laminar Wolfhard-Parker Flames
… burner. The burner could be operated in "single mode" with a cold air/oxygen mixture as the oxidizer for the non-premixed flame or in varying degrees of "dual mode" where the products of lean premixed hydrogen/air/oxygen flames were used as the oxidizer for the non-premixed flame. Premixed flame …
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Dual Mode Macro Fiber Composite-Actuated Morphing Tip Feathers for Controlling Small Unmanned Aircraft
… by pulling inspiration from and avian flight. A dual mode control surface, created by applying two sets of two MFCs to patch of carbon fiber, can mimic the tip feathers of a bird. This actuator was modeled both using Finite Element Analysis (FEA) and Computational Fluid Dynamics (CFD). Real-world …
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Development of ultra-stable MEMS oscillators with 10⁻¹¹-level frequency stability via dual-mode temperature compensation
… on an encapsulated, heavily boron-doped Lamé-mode resonator, which provides a stable, aging-free mechanical platform by isolating the device from environmental perturbations. Building on this platform, we evaluate how temperature variations and electronics-induced phase drift fundamentally …
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Investigation of Grid Adaptation to Reduce Computational Efforts for a 2-D Hydrogen-Fueled Dual-Mode Scramjet
<p>A two-dimensional dual-mode scramjet flowpath is developed and evaluated using the ANSYS Fluent density-based flow solver with various computational grids. Results are obtained for fuel-off, fuel-on non-reacting, and fuel-on reacting cases at different equivalence ratios. A one-step global …
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Integrating lecture recording to support flexible learning and responsive pedagogies in a dual mode undergraduate law degree
… in an undergraduate LLB degree presented in a dual mode (face-to-face and online) by the University of the Free State’s Faculty of Law. In this faculty, lecture recording is observed by compulsory integration in all classes; the only options pertain to three basic software tools. According to …
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Design development and analysis of a dual mode free piston jet engine with applications to light aircraft
Thesis. 1975. M.S.--Massachusetts Institute of Technology. Dept. of Aeronautics and Astronautics.
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A Dose -Response Investigation of Patterns and Correlates of Affective Responses to Acute Exercise: The Dual -Mode Hypothesis
… a dimensional perspective using the circumplex model, (b) the levels of exercise intensity were determined in relation to the ventilatory threshold (VT), and (c) data analysis included an examination of responses at the level of individuals. Thirty healthy volunteers ran on a treadmill for 15 …
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A dual-mode Q-enhanced RF front-end filter for 5 GHz WLAN and UWB with NB interference rejection
… for wireless indoor communications providing moderate range and speed. Combined with the emerging ultra Wideband standard (UWB) for short range and high speed communications, the two standards promise to fulfil all areas of wireless application needs. However, due to the overlapping of the two …
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Managing transient behaviors of a dual mode spark ignition-- controlled auto ignition engine with a variable valve timing system
… and several important phenomena in CAI mode were investigated. Second, the issues encountered during mode transition between SI and CAI regime were considered. Despite wide-open-throttle operation, pumping loss in CAI mode was not negligible. A major source of pumping loss in CAI mode …
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Analysis of a composite dielectric-ferrite loaded resonator using the transmission line model with application to a tunable dual mode bandpass filter
… as well as results from the Experimental Model to insure compliance and validation. A suggestion is included to improve and modify the initial Experimental Model using the applied bias to optimize the frequency shift and bandwidth performance.
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Facial Expressions of Emotion: Influences of Configuration
… theory in facial expression research is the dual mode hypothesis. After reviewing the literature pertaining to the dual mode hypothesis within the recognition of facial identities and emotional expressions, seven experiments are reported testing the role of configural processing within the …
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Weighted sensitivity optical fiber sensors: theory and applications
The polarimetric behavior of conventional dual mode, elliptical-core, optical fiber sensors is investigated. To compliment the experimental results, a novel linearly polarized modal analysis of elliptical-core geometries is performed. The method numerically finds solutions of a waveguide equation …
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Soot formation in vitiated-air diffusion flames
… have been measured using optical techniques in dual mode diffusion flames. A dual mode flame is defined as a diffusion fuel jet that burns in the wake of a premixed flame. The premixed flame combustion products simulate a vitiated-air environment: the air is preheated, rich in radicals, and …
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Novel microwave devices based on multi-port filtering networks
… presented using the MPFNs technique. Various dual-mode resonators such as the patch, the split-ring-resonator and the asynchronously-coupled-junction were implemented as the junction of the diplexers. All demonstrated the signal distribution and combining functions. The demonstrated techniques …
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