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 20 for “"transverse modes"”.
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Measurement of combustion response to transverse modes at high pressure
<p>A two dimensional transverse combustor capable of producing and modulating an unstable flowfield was tested at Purdue. The combustor used an array of coaxial ox-centered shear injector elements. The oxidizer posts were able to be discretely changed in length between tests to investigate …
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Spectral properties and modes of surface microcavities
… the experimental investigations into the transverse mode structure of nearly hemispherical microcavities. The nearly hemispherical microcavity structures are fabricated electrocemically through a template of self assembled latex spheres. Controlling the electrochemical parameters, such as …
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Single cancer cell detection with optofluidic intracavity spectroscopy
… and analyzed. To quantify the strength of transverse modes in their spectra, a single characteristic parameter was determined for each cell by forming a linear combination of the mean and standard deviation of the transmission spectra over one free spectral range excluding the residual …
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The effect of AC magnetic fields on liquid-metal free surfaces in industrialMHD
… is deformed into radially oscillating starfish modes at certain critical magnetic field strengths. We study these azimuthal modes theoretically by investigating the behaviour of an isolated mode. We also consider the influence of geometry in our studies of a related problem invloving a …
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Analysis of Fabry-Pérot laser resonators stabilized by microlenses and applications in speckle-free imaging
… to promote oscillation of various higher-order transverse modes. The fundamental mode produced by this resonator very closely matches theoretical results calculated with standard Gaussian optics as well as numerical Rayleigh-Sommerfeld diffraction results. It was found that the beams are …
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High frequency phonon propagation and detection in III-V semiconductors
… between the scattering of longitudinal and transverse modes is reported. The phonon focusing pattern changes with increasing phonon frequency due to angular dispersion. The results of frequency-selective phonon-focusing experiments on InAs are compared to Monte Carlo calculations …
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High-speed modulation of semiconductor lasers and properties of silver-coated quantum-dot lasers
… µm. Evidence for the presence of multiple lasing transverse modes for a 1.4 µm waveguide width silver-coated laser is presented and discussed. Electrical modulation and RIN measurements of the uncoated and silver-coated lasers are also presented.
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The phonon spectra of simple metals - higher order effects of the electron-ion interaction
… frequency in the case of the longitudinal modes. On the other hand, these terms vanish identically for the transverse modes. By modification of the local pseudopotential, a fit to the experimental data is obtained in the two-umklapp approximation. The behavior of the various contributions …
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Thermodynamics and solitonic excitations of a strongly-interacting Fermi gas
… provide a prediction for the higher collective modes. I also describe a method to obtain the equation of state of global thermodynamic quantitites of harmonically trapped gases from their column density. In another set of experiments, long-lived solitonic excitation was generated via a one-sided …
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Quantum mechanical origin of the plasmonic properties of noble metal nanoparticles
… exhibits high-intensity longitudinal and transverse modes (along the long and short axis of the nanorod respectively), similar to the plasmons observed experimentally for larger nanoparticles. These plasmon modes result from a constructive addition of the dipole moments of nearly …
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A method for the numerical analysis of combustion instabilities with an application to afterburner screech
… the formation of vortices induced by acoustic transverse modes at the afterburner flameholder. These vortices trap fresh reactants that burn after a certain time delay, therefore feeding energy into the oscillation. Within a linear approximation, the effect of small amplitude acoustic …
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Oscillations and waves in anisotropic plasmas
… into one set of equations for longitudinal modes and another set of equations for transverse modes. The problems of longitudinal and transverse plasma oscillations are studied by Fourier transforming the equations in the space variable and analyzing the resulting operator equations using the …
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Controlled Lasing in Gallium Nitride Nanowires
… in a combined multi-longitudinal and multi-transverse mode state. Two schemes are introduced here for controlling the optical mode and achieving single-mode operation of the nanowire lasers. The first method involves placing two nanowires side-by-side in contact to form a coupled cavity. The …
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Charged-Particle Transport in Turbulent Magnetic Fields
… phase angles of a set of circularly polarized, transverse modes with Kolmogorov power-law enveloped amplitudes to construct magnetic field fluctuations with nearly constant |B| but with large variances in the components Bx, By, Bz, as is observed in the Solar Wind. Charged particle scattering …
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Optical micro- and nanofibres: Higher mode generation and particle manipulation studies
… Single mode fibre can also support higher transverse modes, when transmitting wavelengths below that of their defined single-mode regime cut-off. To investigate this, a first-order Laguerre-Gaussian beam, LG01 of 1064 nm wavelength and doughnut-shaped intensity profile is generated free …
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Vibration based performance assessment of concrete-concrete composite bridges
… and analytical first bending, torsion and transverse modes were sensitive to the damaged shear connectors. 65% of damaged connectors were located using these modes. Using experimental modal data, the mode curvatures and flexibility changes were able to locate the damaged region when more …
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A viscoelastic hydrodynamic approach to the density fluctuations in classical liquids
… tensor by viscoelastic models, the collective modes responsible for the density and current fluctuations could be derived accordingly at small wavenumbers. Based on the examinations of two fundamental viscoelastic models, namely, the Kelvin-Voigt model and the Maxwell model, it is found that …
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The development of high power, pulsed fiber laser systems and their applications
… laser to generate continuum in distinct transverse spatial modes of a HF. Numerical simulations suggested that the observed enhancement in UV generation from a higher order mode could be due to differences in the dispersion profiles of the fundamental and higher order transverse modes. …