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.
Results
Showing 1 to 20 of 46 for “"time resolved measurements"”.
-
Time resolved measurements of rotating stall in axial flow compressors
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1988.
-
Time resolved measurements of droplet growth in a Wilson cloud chamber
"The growth rates of water drops in a Wilson expansion cloud chamber are measured with air, argon and helium as the carrier gas, in the size range of .5 to 10 microns. The drops growing in the supersaturated chamber exhibit oscillations in the scattered intensity as predicted by Mie theory. …
-
Time-resolved measurements of a transonic compressor during surge and rotating stall
This thesis presents the results from measurements taken during the transient unstable operation of an axial-flow transonic core-compressor rotor. The measurements were taken to better understand the unstable flow physics of transonic rotors. The rotor, commonly referred to as Rotor 37, was …
-
Spectral estimates and flow characteristics from non-uniformly sampled LDV data in a turbulent junction vortex
The strongly time variant flow in an incompressible, turbulent junction vortex formed at the base of a streamlined cylinder with a circular leading edge placed normal to a flat surface was investigated. The investigation centered around spectral analysis and time resolved measurements of the …
-
Imaging through scattering
… hidden behind turbid layers using ultrafast time-resolved measurements with a sparse-based optimization framework. This novel method has applications in remote sensing and in-vivo fluorescence lifetime imaging. Another method is demonstrated to resolve blood flow speed within skin tissue. …
-
Time-Resolved THz Magnetospectroscopy: Techniques and Applications
… detection, which decreases acquisition time and has enabled some of the first time-resolved measurements of carrier relaxation via cyclotron resonance experiments in bulk Si. In these measurements we observe directly the magnetic field dependence of the carrier relaxation time, which …
-
Experimental Investigation of a Lean, Premixed Gas Turbine Combustor Using Advanced Laser Diagnostics
… and two combustor pressure drops, 3% and 5%. Time-resolved images were acquired at two axial locations for each test condition, revealing a combustion flow field dominated by large-scale turbulent structures. Stabilization of the flame occurred primarily in the side recirculation zone at the …
-
CORRELATED PHOTON PAIRS AND MULTIPHOTON STATES FROM A COLD ATOMIC ENSEMBLE
… The generated two-mode squeezed vacuum enables time-resolved measurements of higher-order photon correlations, providing direct evidence of genuine multiphoton states. Building on this foundation, the thesis further explores photon-triplet generation via composite spontaneous six-wave mixing, …
-
Development of a data reduction method for a high frequency angle probe
… angle probe is designed for unsteady aerodynamic measurements in transonic cryogenic wind tunnels. The probe measures time-resolved total pressure, static pressure, angle of attack, and yaw angle from readings of four pressure transducers. The unique feature of this probe, as compared to a …
-
Biological propulsion for water exit : 3D experimental study of archer fish jumping
… in limited space. In addition, flow field measurements made using planar particle image velocimetry (PIV) reveal vortical wake structures originating from the caudal, dorsal, anal, and pectoral ns. Exact n interactions cannot be identied from a single slice through the wake, suggesting a …
-
Sampling time-resolved phenomena
Broadly speaking, time-resolved phenomena refers to three dimensional capture of a scene based on the time-of-flight principle. Since speed and and time are proportional quantities, knowing time-of-flight allows one to estimate distances. This time-of-flight may be attributed to a pulse of light or …
-
The turbulent structure of the jet in cross-flow
… far field was investigated experimentally using time-resolved, multi-scale and statistically independent Stereoscopic Particle Image Velocimetry measurements to reveal the mean and instantaneous three-dimensional (3D) structures. All of the measurements were performed in the Counter-rotating …
-
Biomechanical Golf Swing Analysis using Markerless Three-Dimensional Skeletal Tracking through Truncation-Robust Heatmaps
… few have provided open, quantifiable, and time-resolved measurements of angular kinematics across the full swing cycle. This thesis seeks to address this gap by implementing a markerless temporal skeletal tracking approach built on the open-source MeTRAbs computer vision framework to model …
-
Dynamics of oxygen penetration and diffusion into horse skeletal myoglobin revealed by quenching of zinc protoporphyrin IX fluorescence
… using the kinetic constants derived from the time resolved measurements with the experimental data, indicates that the dynamic model accurately represents the oxygen quenching process in horse skeletal myoglobin in all the temperature and viscosity range investigated.
-
Shielding design for the time-resolving Magnetic Recoil Spectrometer (MRSt) on the National Ignition Facility (NIF)
… acheiving ignition in a laboratory for the first time. Multiple diagnostics are needed to generate the scientific data necessary for guiding these experiments at the NIF toward this goal. The time-resolving Magnetic Recoil Spectrometer (MRSt) aims to provide time-resolved measurements of the …
-
Computational Modeling of Bacterial Biofilms
… imaging and image analysis techniques, highly time-resolved measurements of complex bacterial communities at single-cell resolution are now possible to obtain. Guided by these rich experimental data sets, we improve a recently proposed three-dimensional individual-based simulation framework to …
-
Using time-resolved nuclear diagnostics to probe kinetic/multi-ion physics and shock dynamics on OMEGA and the NIF
… focuses on the development and application of time-resolved nuclear diagnostics to probe plasma evolution in Inertial Confinement Fusion (ICF) implosions. On the OMEGA laser facility at the Laboratory for Laser Energetics (LLE) in Rochester, New York, the impact of kinetic and multi-ion effects …
-
Dynamic flow quality measurements in a transonic cryogenic wind tunnel
… in a piggyback arrangement were developed for time-resolved measurements of dynamic flow quality in a transonic cryogenic wind tunnel. The first one is a dual hot-wire aspirating probe for measurement of stagnation pressure and temperature. The second is a miniature high-frequency response …
-
Dynamics of three-phase systems: Bubbles, droplets and their interactions with surfaces
… are not well known, and lack of experimental measurements of the interaction with surfaces has led to the development of countless competing numerical models. Experimentally, bubbles provide a challenge because they are fast and stochastic, and obtaining accurate measurements of the dynamics, …
-
Machine Learning for Coherent Structure Identification and Super Resolution in Turbulent flows
… (PIV) techniques provide high fidelity measurements of mutliscale turbulent fluid motion. The research presented in this thesis broadly explores the utilization of Machine Learning for processing and analyzing non-time resolved PIV measurements of turbulent flows. The primary goal is to …
Page 1 of 3