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 13 of 13 for “"Dipole source"”.
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Computation and control of flow-induced noise behind a circular cylinder using an acoustic analogy approach
… applications, the prediction of both the sound source and its far-field propagation is necessary as required by regulations. Recently, powerful computers and reliable algorithms have allowed the prediction of far-field noise through the use of Computational Fluid Dynamics (CFD) data as …
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Messungen und Modellbildung zur Untersuchung der amplitude modulation following response
… its modeling by means of an inner ear model and dipole source analysis. Important topics of the thesis are electrophysiological experiments regarding the dependency of the AMFR amplitude and phase on stimulation parameters. It is shown which statistical methods are suitable for the application of …
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Unterschiedliche Generierung niedrig- und hochfrequenter Komponenten somatosensorisch evozierter Potenziale (SEP) beim Menschen
… by applying principal component analysis and dipole source analysis. The results were that different source evaluation strategies provided converging evidence for a cortical HFO origin, with two different almost orthogonally oriented generators being active in parallel, but with a phase shift …
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Propagation Of Sound In The Vicinity Of Rigid Porous Interfaces
… the sound field emanating from a monopole source above and below a rigid porous interface. The solutions can be expressed in a form that resembles the classical Weyl-Van der Pol formula. A heuristic method is then proposed to remove the singularity within the asymptotic solution via …
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Theory and applications of chirality in microstrip antennas
… electric field is found for an elemental point dipole source. The theory is directly applicable to radiation from a printed circuit antenna having a chiral substrate. Current research efforts show that under certain circumstances, the introduction of chiral materials as substrates of microstrip …
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Analysis of early auditory evoked potentials elicited by stimuli with directional information
… interaural parameters. Chap. 4 deals with the dipole source analysis of multi-channel ABR data to lateralized clicks. The moment trajectories of a rotating dipole do not correlate with a single interaural cue alone, but with the psychophysical lateralization caused by the combination of both …
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Flow -Induced Noise in Heat Exchangers
… The measurements were then used to infer noise source strength and system damping using an acoustic model. The acoustic model was based on the inhomogeneous convected Helmholtz equation with a point dipole source term, volumetric damping and damping at the duct walls. The acoustic model was able …
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Low-Frequency Emission Enhancement by Resonant Acoustic Metamaterials
… and controlling the directivity of an acoustic source is however restricted to the properties of the source. In particular, the size of the source, in comparison with the wavelength of the sound, plays a very dominant role in determining the quality of the emitted acoustic wave. Most problems …
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Electromagnetic probing of the lunar interior in the frequency region from one kilohertz to ten kilohertz
… The electromagnetic fields of idealized dipole sources located within a few meters of the lunar surface and immersed in the solar wind plasma are considered. For a vertical electric dipole, or broadside to a horizontal magnetic dipole, the surface fields at radial distances greater than …
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Variabilität thalamischer und kortikaler Hochfrequenz (600 Hz) somatosensibel evozierter Potentiale durch Modulation des Aktivierungszustandes bei fokussierter Aufmerksamkeit
… arousal changes on the 600-Hz oscillations. A dipole-source analysis of 64-channel SEP recordings after electric right-median-nerve stimulation allowed the comparison of brainstem, thalamic, and two cortical (one tangential, one radial) source activities in ten awake human subjects under two …
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Development of bio-inspired distributed pressure sensor arrays for hydrodynamic sensing applications
… hydrodynamic stimuli, including the flow from a dipole source, and the Karmin vortical wake flow behind a circular cylinder. The CBPDMS foam sensor arrays have significant advantages over existing commercial sensors for distributed flow reconstruction and control. They are found to have …
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Sound Propagation in Inhomogeneous Media
… and used to investigate the field due to a dipole source over an impedance plane; - directivity effects over an impedance or poroelastic plane are explored using the FFP formulation, asymptotic approximations and laboratory experiments. The over all theme of this thesis is the study of the …