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 11 of 11 for “"density fluctuation"”.
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Superior to one of Glass: Natural Gradient index Lenses via Patchy Particle Self-Assembly
… biological lens must also maintain low protein density fluctuation at the length-scale of a wavelength of visible light in order to maintain transparency. In squids, this sophisticated optical design emerges from the properties of a single protein fold, the S-crystallin. In this thesis, I study …
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Computation and control of flow-induced noise behind a circular cylinder using an acoustic analogy approach
… source term that affects the total acoustic density fluctuation. The objective of this research is to study the suppression of flow-induced noise behind a circular cylinder using a flow control method. The selected method is the electro-magnetic feedback control method developed by Chen and …
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Effective interactions, transport properties, and elementary excitations in helium three-helium four mixtures
… temperature to be ~ 10-8oK. The change in the density fluctuation excitation spectrum of 4He atoms in 3He-4He mixtures is calculated by including three physical effects: (i) the change in the particle density, (ii) mode-mode coupling iv between 4He and 3He density fluctuation, (iii) direct …
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Studies of electron temperature fluctuations in the core of Alcator C-Mod plasmas via correlation electron cyclotron emission
… is believed to be attributed to turbulent fluctuations. New Correlation Electron Cyclotron Emission (CECE) experiments on Alcator C-Mod show lower levels of electron temperature fluctuations in the saturated ohmic confinement (SOC) regime than in the linear ohmic confinement (LOC) regime, …
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On the boundary conditions for dissipative particle dynamics (DPD)
… a new wall model in which there is virtually no density fluctuation near the wall boundary. Two test cases of Couette flow and lid driven cavity have been done to show that DPD can be used successfully to validate the results. In order to simulate flows where periodic boundary condition cannot be …
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An optical crosscorrelation technique for turbulent density measurements in flames
… and, if the flow is isotropic, root mean square density fluctuation, and the two point fluctuating density covariance The envelope of test conditions was as follows: approach flow mean velocity (U) of 20-30 fps; approach flow relative turbulent intensities (u'/U) of 3, .6, or 10%; and equivalence …
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Microscopic theory for dynamics in entangled polymer nanocomposites
… microstructures, and spatially-resolved polymer density fluctuation dynamics. The key motional mechanism is described via the parallel relaxation of the force exerted on the particle controlled by collective polymer constraint-release and the particle self-motion. A sharp but smooth crossover …
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Structure-property behavior of hybrid materials incorporating oligomeric species with inorganic silicates by a sol-gel process
… systematic decrease in the mean square electron density fluctuation. The mechanical properties of PTMO containing materials were considerably enhanced compared to the PDMS hybrid systems. Depending on the composition and oligomeric molecular weight, the tensile strength could reach 33 MPa. Also, …
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The growth of density fluctuations in a finite sized inhomogeneous plasma
… of laser-fusion. We have studied the growth of density fluctuations in an inhomogeneous plasma because two mechanisms of absorption, anomalous absorption due to the growth of parametric instabilities and absorption by short wavelength density fluctuations, may be influenced by the growth of …
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Compressible turbulence in a high-speed high Reynolds number mixing layer
… determine root-mean-square index of refraction (density) fluctuation levels from the Shadowgraph plates. Multiple overheat normal and cross-wire techniques were developed and/or improved for this study. The present research concentrated on the Reynolds averaged form of the Navier-Stokes …
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Three-dimensional kinetic simulations of active suspensions: effect of chemotaxis and steric interaction
… and puller suspensions are unstable to random fluctuations and are characterized by highly nematic structures. Detailed measures are defined to quantify the degree and direction of alignment, and the effects of steric interactions on pattern formation will be presented. Our analysis shows that …