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 19 of 19 for “"Amplitude response"”.
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High amplitude response behavior of a linear oscillator-nonlinear absorber system: Identification, analysis, and attenuation by using a semi-active absorber in series
… as "energy pumping" but can also exhibit high amplitude solutions which significantly amplify the response of the primary structure. Semi-active tuned mass dampers (STMDs) incorporate an actuating element in order to achieve real-time tuning adjustment capability. This thesis presents a global …
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Pressure estimation using time-lapse seismic in compacting reservoirs
… approach to estimate pressure changes from 4D amplitude attributes in compacting reservoirs. The time-lapse seismic signal in these types of reservoirs results from the combination of pressure depletion, rock compaction and stress redistribution within the reservoir and throughout the …
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A higher-order method for large-amplitude simulations of bodies in waves
In this thesis, we simulate large-amplitude motion of three-dimensional bodies in waves using a higher-order boundary element method. A 'geometry-independent' approach is adopted in which the representation of the body surface is separated from the discretization of the hydrodynamic solution. …
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Experiments with withdrawal-induced resonant internal waves
… with interfacial thickness as does wave amplitude: observed periods ranged from 1.01 to 1.05 times greater than theoretically determined periods for two-layer systems. Theoretical determination of the period is based on consideration of the density structure and boundary conditions of the …
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Development of diffusive optical imaging as a tool for studying the neurobiology of birdsong
… prototyping technology and applied it to record responses to presentations of birdsong in isoflurane-anesthetized zebra finches. We discovered a subtle but significant difference between the hemoglobin spectra of zebra finches and mammals which has a major impact in how hemodynamic responses are …
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Characterisation and monitoring of mineral deposits in down-hole petroleum pipelines.
… the characterisation of deposits, the pulse echo response due to curved reflectors were modelled. Close agreement of the model with practical measurements was demonstrated. From these investigations a compensation function was derived which normalises the amplitude response of the received echoes …
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A posture control model and balance test for the prediction of relative postural stability, with special consideration to the problem of falling in the elderly
… subject safety, the balance test used a small-amplitude continuous random or pseudorandom perturbation. The data were used to identify an input-output model, which was then used to predict large-amplitude transient response. The test perturbation was an anterior-posterior acceleration of a …
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Optical Characterisation of Astronomical Submillimetre Receivers including ALMA Bands 5 and 9
… systems. The reflection and transmission amplitude response patterns of several standing wave cavities were predicted with this technique and compared with experimental measurements. The effect of minor alterations to the feed horn structures on the resonance profiles are studied in depth. …
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Switching and generation of ultrashort pulses using all-fibre devices
… to device operation, effect of cascading on amplitude response, and impact of switching on the characteristics of incident pulses. By using relatively long input pulses, device failure due to stimulated Raman generation is postponed to demonstrate multiple-peaked switching for the first time. …
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Rotor speed microsensor for the MIT Microengine
… The shock tube test characterized the dynamic response. The temperature coefficient of resistivity (TCR), 0.009/K , and the room temperature resistance, ~9 kohms, measured in the furnace characterization experiments were approximately 50% less and 300% more than the predicted values, …
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Remote Sensing of 21st Century Water Stress for Hazard Monitoring in California
… of the solid Earth, an opposite and smaller amplitude response than the poroelastic deformation of aquifer systems. These mass changes can disturb the regional stress field, which may influence earthquake activity. Both the elastic and poroelastic deformation responses can be observed using …
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The Integration and Applications of Organic Thin Film Transistors and Ferroelectric Polymers
… is instrumented along its length and the amplitude response at 15 sites is recorded and analyzed as a function of the frequency of excitation. The determination of the dominant frequency component of an incoming sound is demonstrated using linear system decomposition of the time-averaged …
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Towards 3D Crop Phenotyping of Above- and Belowground Grain Sorghum Plant Traits Using Airborne Mounted Multispectral Camera, TLS, and GPR Remote Sensing Technologies
… as an indication of drought tolerance, in response to deficit irrigation. For both the 2021 and 2022 growing seasons, we measured changes in plant height, NDVI, and below-ground root response using a Leica C10 TLS, a MicaSense Altum multispectral camera mounted on a DJI Matrice 600 Pro …
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The Effect of Sternocleidomastoid Muscle Activation Pattern and Feedback Condition on the Vestibular Evoked Myogenic Potential.
… vestibulospinal pathways. The VEMP is a biphasic response elicited by loud clicks or tone bursts and recorded from the tonically contracted sternocleidomastoid (SCM) muscle. Because the VEMP is an inhibitory response, it is important to investigate stimulus and parameter characteristics in order …
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Modeling Cable Harness Effects on Space Structures
… of cables on lightweight spacecraft, the dynamic response of cabled structures must be understood and modeled for accurate spacecraft control. Models of cable behavior are reviewed and categorized into three major classes consisting of thin rod models, semi-continuous models, and beam models. A …
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Seismic attribute analysis and CO2 monitoring within the Mississippian reservoir, Wellington field, Sumner County, Kansas
… with increasing CO2 saturation, respectively. Amplitude Variation with Offset (AVO) analysis of the post-injection 2-D seismic line evaluated the amplitude response at seismic gathers near to and far from the injection well. The majority of the CDP’s (including CDP 203230 – location of KGS …
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Characterizing microearthquakes and shallow structure with dense array and optical fibers
… methods help deal with the DAS instrument response. The gauge length adds a velocity-dependent amplitude response that we need to consider when modeling the DAS spectrum. I provide workflows for conducting seismic imaging surveys using telecom cable and downhole DAS for temporal monitoring …
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Biophysical mechanisms of frequency-dependence and its neuromodulation in neurons in oscillatory networks
In response to oscillatory input, many isolated neurons exhibit a preferred frequency response in their voltage amplitude and phase shift. Membrane potential resonance (MPR), a maximum amplitude in a neuron’s input impedance at a non-zero frequency, captures the essential subthreshold properties of …
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Quantitative monitoring of gas injection, exsolution and dissolution using 4D seismic
… data. However, it is recognised that the seismic response still largely provides a qualitative estimate of the moved subsurface fluids; exact quantitative evaluation of fluid distributions and associated saturations remains a challenge still to be solved. It is widely believed that a few percent …