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 437 for “"Feedback loop"”.
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Complex dynamics of a microwave time-delayed feedback loop
… generated from a microwave time-delayed feedback loop. Time-delayed feedback systems are especially interesting because of the rich variety of dynamical behaviors that they can support. While ordinary differential equations must be of at least third-order to produce chaos, even a simple …
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An analysis of the developer-user feedback loop in "The Edge"
Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2003.
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Dynamic Characterization of the IKK:κBα:NFκB Negative Feedback Loop Using Real-Time Bioluminescence Imaging
… NF-κB signaling is the IKK:NF-κB: IκBα negative feedback loop that plays a major role in regulating the strength and duration of NF-κB transcriptional activity. We have developed and characterized an unique bioluminescent reporter (κB<sub>5</sub><sub>à</sub>IκBα-FLuc) that recapitulates this …
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Feedback loop design and experimental testing for integrated optics with micro-mechanical tuning
I designed a capacitive sensor with feedback control for precision tuning of a MEMS controlled wavelength-selective switch. The implementation is based upon a customized feedback loop with a PID controller. The positional stability of the bridge can be controlled to within 0.5 [Angstroms], and the …
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Prediction of Tonal Acoustic Radiation Due to Feedback-Loop Resonant Interactions in Transitional Airfoils
<p>The objective to this work is to employ the surface integral methods to study the far-field noise propagation from the flow acoustic resonant interactions of the transitional airfoil. The Potential-Theoretic Method (PTM) as an advancement to traditional Kirchhoff methods is presented. The PTM …
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Enhancing Auditor Expertise: Using Cognitive Load Theory to Examine a Reinforcing Feedback Loop Between Knowledge and Ability
… information, hence establishing a reinforcing feedback loop between knowledge and ability. I test for the feedback loop's existence within a laboratory experiment in which participants learn about a dynamic business environment for an audit analytical procedures task. I manipulate whether …
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Development and modeling of conducting polymer actuators and the fabrication of a conducting polymer based feedback loop
… for the first time to build a reflex or position feedback loop that rejects position disturbances. The successful operation of the conducting polymer based reflex loop is an important step towards building an all polymer reflex loop that is directly integrated into a bulk material. Such a reflex …
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Characterization of biotic and sodic lawns of the Kruger National Park using the framework of the positive feedback loop / Courtney Moxley
… of these communities is controlled by positive feedbacks between grazers and the high-quality resource forage that the component grass species provide. Different nutrient cycling dynamics among the lawns identifies two discrete lawn types in the savanna: bioticallydriven lawns on nutrient-rich …
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High Temperature Seismic Monitoring for Enhanced Geothermal Systems - Implementing a Control Feedback Loop to a Prototype Tool by Sandia National Laboratories
… wall. Additionally, development of a closed-loop process control utilized feedback from the contact force between the coupling arm and bore-hole wall. Employing a feedback circuit automates the tool deployment/anchoring process and reduces reliance on the operator at the surface. The tool …
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Feedback circuit for organic LED active-matrix display drivers
A feedback circuit for an Organic Light Emitting Diode (OLED) based display is proposed and demonstrated. An OLED-based flat panel display is brighter, much lower power, has no viewing angle limitation and potentially cheaper compared to available Liquid Crystal (LC) based displays. Despite these …
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Investigation of combined feedback and adaptive control of cylinder vibrations
A double loop control scheme is developed to control broadband acoustic radiation from a cylinder. An analog feedback loop is investigated and developed to add damping to the cylinder at particular frequencies of interest. Circuitry is developed and refined to condition Polyvinylidene Fluoride …
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In Pursuit of a Beautiful World
… OF CONTENTS In Pursuit of a Beautiful World 1 Feedback Loop 25 Lukewarm 44 Dana Asks a Girl Out 61</p>
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Sensitivity analysis of oscillating dynamical systems with applications to the mammalian circadian clock
… with one having an additional negative feedback loop compared to the other. The differences in their behavior with respect to phases, the period and amplitude are discussed in the context of their network architecture. It is found that, contrary to previous assumptions in the literature, …
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Effect of Flow-Acoustic Resonant Interactions on Aerodynamic Response of Transitional Airfoils
… airfoil surface and thus eliminate the acoustic feedback loop as the tone-generating mechanism. The current work focuses on comparing the lift, drag, and lift to drag ratio curves in the uniform vs. turbulent flow cases to determine the impact of the acoustic feedback loop on the airfoil …
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Information processing in a midbrain visual pathway
… of tectal neurons in a dynamical recurrent feedback loop. We reveal in a computational model that the anti-topographic inhibitory feedback could mediate competitive stimulus selection in a complex visual scene. We also investigated the dynamics of the competitive selection in a rate model. …
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Linearization of RF Power Amplifiers
… is surveyed, reviewed and analyzed. Cartesian feedback is specifically presented as an effective means of linearizing an efficient yet non-linear power amplifier. This reduces amplifier distortion to acceptable levels and enables the transmission of RF signals utilizing spectrally efficient …
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The Mechanisms And Roles Of Feedback Loops For Visual Processing
Signal flow in the brain is not unidirectional; feedback represents a key element in neural signal processing. To address the question on how do neural feedback loops work in terms of synapses, microcircuitry, and systems dynamics, we developed a chick midbrain slice preparation to study and …
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Examining the Relationship Between Library Services Use and Fall-to-Fall Retention in Community College Libraries
… detected. </p> <p>It was proposed that a feedback loop may exist at community colleges that divorces library activity from institution level student retention outcomes. Such a feedback loop has been untested in the literature, and further research is suggested. </p>
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Breaking the Loop: Climate-Driven Urbanism for America's Climate Migration Hubs
… This thesis examines the climate migration feedback loop, where climate migrants relocate to urban areas with carbon-intensive development patterns, inadvertently accelerating the climate change driving their displacement. Through analysis of three contrasting metropolitan areas—Atlanta, …
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Social media sharing and online news consumption
… emergence of an incredibly important positive feedback loop between social media sharing and online content consumption. The potential of this feedback loop is critical to marketers, publishers, politicians, and beyond. However, identifying causal effects in this context is very difficult. The …
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