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 10 of 10 for “"phase lead"”.
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Generalized Average-Current-Mode Control of Single-Phase AC-DC Boost Converters with Power Factor Correction
… average-current-mode control (ACMC) for single-phase ac-dc boost converters with power factor correction (PFC). Traditional ACMC is generalized in a sense that it offers improved performance in the form of significant reduction of the current control loop bandwidth requirement for a given line …
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Application of a model of cerebellar function to the maintenance of human upright posture
… a linear feedback control scheme including a phase lead compensator. The neural feedback signal represents the action of the cerebellum in the processing of angular position and angular velocity error signals. The goal of the investigation is to indicate whether the simple linear filters can …
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Model-based active control of thermoacoustic instability in continuous combustion processes
… control designs including proportional, phase-lead, and LQG are presented and tested on the bench-top combustor using a 0.2 W loudspeaker as an actuator. Results show that the model-based controllers are effective in suppressing the instability, and that the simulation results accurately …
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A GEOCHEMICAL MODEL FOR PREDICTING CORROSION- SCALE DISSOLUTION AND PHASE TRANSFORMATIONS IN DRINKING WATER DISTRIBUTION SYSTEMS
… geochemical model has been developed to predict lead dissolution and solid phase transformations in water distribution systems for varying water chemistry conditions and corrosion scale compositions. The equilibrium model is developed in PhreeqC.v.2.16.03 with reactions and thermodynamic …
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A molecular dynamics study of liquid crystal mixtures.
… isotropic (/), nematic (N) and smectic-B (SmB) phases with both the I-N and N-SmB phase boundaries not clearly defined. Competition between two density waves parallel to the director of the same wavelength but different phase lead to a pre-smectic ordering preceding the N-SmB phase transition. …
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Multi-scale chemistry modeling of the thermochemical conversion of biomass in a fluidized bed gasifier
… later shown to play an important role in the gas-phase conversion of the devolatilization products, and a direct correlation is shown between particle diameter and polycyclic aromatic hydrocarbon (PAH) production in a pyrolysis reactor. Next, a reactor network model (RNM) is developed for FBBGs …
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The functional role of tectorial membrane poroelasticity in cochlear mechanics
… TM is large at high frequencies, where these two phases are entrained by viscosity to move together. Interestingly, the transition frequency is in the audio frequency range only for hair bundle sized tips. Furthermore, the transition region is characterized by increased phase lead between the …
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Ink jet printing of PZT thin films for MEMS
… piezoelectric engineering materials perovskite phase lead zirconate titanate (PZT) has the strongest mechanical to electrical coupling. PZT based devices have the potential to have the highest performance. Due to the strong piezoelectric response and low operating voltage, many groups have …
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Investigating the suppressive effects of a low-frequency bias-tone on auditory-nerve responses to tail-frequency tones
… suppression pattern, e.g., most importantly the phase of major suppression, did not reveal any significant differences between the two response types. Overall these results indicate the detailed mechanisms of the OHC mechano-electric transduction function that are involved in producing the two …
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Experimental analysis of flow and turbulence characteristics in oscillatory boundary layers from LDV measurements
… A surprising behavior was observed in the phase of the peak bed shear stress, which changed dramatically with Rew: first leading about 40º ahead of the outer flow for low Rew, then lagging up to 25º behind for the transitional Rew experiments, and finally returning slightly ahead about 5º …