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 34 for “"dynamic measurements"”.
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Dynamic Measurements with Scanning Probe Microscopy: Surface Studies Using Nanostructured Test Platforms of Metalloporphyrins, Nanoparticles and Amyloid Fibrils
… with dimensions ranging from 1 to 200 nm. Dynamic MSM-AFM measurements can be obtained by placing the tip on a vibrating nanoparticle and sweeping the frequency or field strength. Changes in frequency spectra and vibrational amplitude can be mapped for nanoparticles of different sizes, …
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Rock differentiation using microwave irradiation
… low power microwave attenuation and reflection measurements was undertaken. Reflection measurements were found to be impractical due to the similar amounts of reflected signal from the different rock types. Microwave signal attenuation through rock samples was studied over a broad frequency …
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A pulsed ion source for a 250 Key Cockcroft-Walton accelerator
… target produce neutrons in bursts thus allowing dynamic measurements of moderator and reactor core properties. Beam pulsing is accomplished by means of an einzel lens and an alternating potential applied to a pair of deflection plates. Proteins have been used exclusively in adjusting the source …
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Study of the electromechanic aspects of RF MEM devices with particular emphasis on the dynamic behavior for the case of RF MEM switches and tuneable capacitors
… This thesis is focused on the study of the dynamic behavior of the RF switches with the aim to nd suitable ways to develop switch geometries with faster switching characteristic. The study considers process related aspects, theoretical calculations, numerical simulations and dynamic …
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Analysis and dynamic modelling of complex systems
… of the system. To this end quantitative dynamic measurements are made. Then mathematical models are proposed and validated using this experimental data.
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A real-time optical measurement system
Measurement of the dynamics of flexible structures is difficult because the motion is often complex and the structures are not well suited to the attachment of sensors. As a result, non-contact optical systems are used. However, optical systems produce large amounts of data which make their use in …
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Integration and characterization of a control and signal processing system for a SERF magnetometer array
… (MEG), magnetic anomaly detection (MAD), dynamic measurements of geomagnetic fields, and MRI signal detection. While numerous architectures are being pursued in the development of high sensitivity magnetometers, optical atomic magnetometers are of substantial interest due to their small …
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Contact Resonance Atomic Force Microscopy using advanced sensors and post-processing techniques
… Microscope for topographic and sampleproperty measurements and can achieve a nano-scale resolution. Contact resonance spectroscopy allows the estimation of mechanical properties by measuring the sensor-sample coupled system resonance frequency. To date, contact resonance has been limited to …
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Enhancing Pavement Surface Macrotexture Characterization
… This dissertation compares static and dynamic macrotexture measurements and proposes and enhanced method to quantify the macrotexture. Dynamic measurements performed with vehicle-mounted lasers have the advantage of measuring macrotexture at traffic speed. One drawback of these laser …
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Computation of a Damping Matrix for Finite Element Model Updating
… damping is more difficult to determine from dynamic measurements than natural frequency. However, damping is extremely important in formulating predictive models of structures. In addition, damping matrix identification may be useful in diagnostics or health monitoring of structures. The …
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Model reduction for dynamic sensor steering : a Bayesian approach to inverse problems
In many settings, distributed sensors provide dynamic measurements over a specified time horizon that can be used to reconstruct information such as parameters, states or initial conditions. This estimation task can be posed formally as an inverse problem: given a model and a set of measurements, …
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Flow of water through orifices in pipe line
Made available in DSpace on 2017-11-30T22:11:10Z (GMT). No. of bitstreams: 2 5992114.pdf: 14455840 bytes, checksum: 381ffc5050067feb29ba1332cfe95f12 (MD5) license.txt: 4813 bytes, checksum: 715c4321821a960fa1a1e91d2ac7ebce (MD5) Previous issue date: 1916
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Switching Dynamics in Ferroelectric Hf₀.₅Zr₀.₅O₂ Devices: Experiments and Models
… is still controversy about the FE switching dynamics, a crucial factor in designing ferroelectric device applications. This thesis pursues fundamental understanding of the switching dynamics in FE-HZO structures founded on accurate dynamic measurements with meticulous experimental design …
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A wearable, wireless sensor system for sports medicine
… and provide limited update rates and dynamic accuracy, to make these measurements. This project uses 6 degree-of-freedom inertial measurement units worn on various segments of an athlete's body to directly make these dynamic measurements. A combination of low and high G sensors enables …
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Surface-Enhanced Spectroelectrochemistry using Synchrotron Infrared Radiation
… spectroelectrochemical cell design. Furthermore, dynamic measurements are fundamentally limited by the finite rise time of the electrode. For many important processes with characteristic timescales in the milli- to microsecond regime, achieving a suitably low rise time requires the use of an …
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Investigation of cellular microenvironments and heterogeneity with biodynamic imaging
… living cancer cell count) and do not capture the dynamics of tissue response.</p> <p>Biodynamic imaging (BDI) is a 3D tomographic imaging and assay technique that uses the dynamics of scattered coherent light, or speckle, to measure dynamic response of tissue to perturbations. Dynamic measurements …
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Mechanical and microstructural characterization of nuclear grade PCEA graphite
… fracture mechanisms. Bulk density measurements showed that PCEA graphite exhibits excellent homogeneity, with no measurable anisotropy between with-grain and against-grain orientations. A slight radial density gradient was identified, with marginally higher densities at the billet …
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Dynamics and Turnover of Lipid and Protein Domains in Cells and Supported Bilayers
… neuroendocrine cells. Syx1a was measured using dynamic measurements (FRAP and single molecule tracking), first by looking at substrate dye interactions to ensure dynamics were not altered by unintended interactions between dye and substrate. Following these studies it was determined that the …
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A precision laser scanning system for experimental modal analysis: its test and calibration
… Velocimetry technique has been widely used for dynamic measurements and experimental modal analysis. A laser scanning system that provides position accuracy, speed, and flexibility plays a key role in this technique. This thesis gives an overview of various laser scanning techniques and the …
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