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 64 for “"standing waves"”.
-
Standing waves in supercritical flow of water
Thesis (M.S.) Massachusetts Institute of Technology. Dept. of Civil and Sanitary Engineering, 1947.
-
Theoretical investigation of standing waves in hydraulic structures
Thesis (M.S.) Massachusetts Institute of Technology. Dept. of Civil Engineering, 1946.
-
Bathymetric evolution of sand bed forms under partially standing waves
… wave flume where the interaction between water waves and a movable sand bed were investigated. Monochromatic and poly- chromatic waves of specified amplitudes and period were generated under cases of weak (R=0.2) and/or strong (R=0.9) reflections. Experiments included one of two mean grain sand …
-
Computer simulation of finite amplitude standing waves in rigid-walled ducts.
… ratio was applied to finite-amplitude standing waves by the use of the Fast Fourier Transform. Computer programs were written to determine the amplitudes and phases of the first 255 harmonics. Curves of harmonic distortion as a function of the strength parameter were found to be in …
-
Super-resolution wide-field optical microscopy by use of Evanescent standing waves
… light. In this thesis, a microscopy technique, standing wave total internal reflection fluorescence (SW-TIRF), has been developed with resolution beyond the classical diffraction limit. The SW-TIRF approach modifies the point-spread function to effectively decrease the excitation wavelength by …
-
Turbulent Boundary Layer over a Piezoelectrically Excited Traveling Wave Surface
Recent studies have utilized spanwise traveling waves to alter the turbulent boundary layer with the aim of reducing skin friction drag. Spanwise traveling waves are a promising active drag reduction technique; however, the wave generation methods used in previous studies are bulky and could not be …
-
Free-field reciprocity calibration of condenser microphones in the low ultrasonic frequency range
… crosstalk, distortion, measurement distance, standing waves and reflections, environmental conditions) were studied and optimized. Measurement results and their associated uncertainties are given in the ultrasonic frequency range from 20 kHz to 160 kHz in 1/3-Octave steps. The end of this …
-
Generation of sand bars under surface waves
… reflection, monochromatic and polychromatic waves, and several sediment grain sizes. In particular, sediment sorting was demonstrated under standing waves when the seabed consisted of initially well mixed sand of two grain sizes.
-
Computational Modelling and Experimental Verifcation of Quasioptical Components at Millimetre Wavelengths
… Mode Analysis. A method of analysing the form of standing waves present in a system involving metallic rings was described. A method previously used for the analysis of standing waves between feedhorns was adapted to examine the form of the modes present in the resonant Fabry-Perot cavity. …
-
In-plane vibration of a plate having an elliptical hole of arbitrary eccentricity
… an elliptic hole is studied. It is shown that standing waves whose wavelength is the same order of magnitude as the size of the hole are theoretically capable of causing microcracks which have been observed experimentally. Several approaches were used including reduction of the mixed boundary …
-
Angle-resolved photoemission studies of two-dimensional electron systems
… well states, which are essentially electronic standing waves. Our work on Ag films grown on Ge(111) demonstrates that the incommensurate interface potential results in strong modifications to quantum well states. The observed electronic interference structures are attributable to the mixing of …
-
A Study on Steady State Traveling Waves in Strings and Rods
… to study how mechanical steady state traveling waves can be generated and propagated through one dimensional media by applying forces. By steady state traveling waves we refer to propagating mechanical waves in a finite medium that never exhibit reflections at the boundaries and continuously …
-
Generating Traveling Waves in Finite Media Using Single-Point Excitation via Passive Absorber
… responsible for transducing incoming acoustic waves into electrical signals. These acoustic signals are carried as traveling waves by the BM and propagate from the base of the cochlea toward its apex where the helicotrema is located. An impressive feature of the mammalian auditory system is to …
-
All Pass Readout With Ring Resonators for Qubit Measurement
… problems with resonator linewidth variation, standing waves, and voltage nodes in the feedline, leading to challenges in scaling to larger frequency multiplexed systems. This thesis proposes an all-pass readout scheme that utilizes ring resonators that do not require a weakly coupled port, …
-
Hydrodynamics and sedimentary structures of antidunes in gravel and sand mixtures
… in unidirectional flow. Based on this understanding, three suites of experiments were designed and conducted to elucidate turbulent flow structure within the standing waves above antidunes and to record the sedimentary response of a loose mobile bed that constituted the antidunes. The first …
-
Features of nonlinear wave-wave and wave-body interactions
Although nonlinear water waves have been the subject of decades of research, there are many problems that remain unsolved, especially in the cases when one or more of the following factors are involved: high-order nonlinear effects, moving boundaries, wavestructure interactions and complicated …
-
High Speed Acoustophoresis for Multiphase Micron-Sized Particle Assembly
… its material agonism. In this method, acoustic standing wave pressure gradients interact with the particles to generate the acoustic radiation forces that assemble the particles into the desired pattern. However, assembly times are prohibitively slow in applications with small particle sizes and …
-
Hamiltonian bifurcations in Schrodinger trimers
… freedom from three down to two. The families of standing waves are enumerated and normal forms are used to describe several families of relative periodic orbits whose topologies change due to Hamiltonian Hopf bifurcations and transcritical bifurcations. The Hamiltonian Hopf bifurcation occurs …
-
Microfluidic systems for cell transfection using sonoporation and electroporation
… system with certain biological cells. Ultrasonic standing waves, previously used for ultrasonic particle manipulation, have been used in the development of the sonoporation aspects of the system. MATLAB has also been used to analyse the required acoustic conditions within the chamber. Furthermore, …
Page 1 of 4