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 307 for “"Frequency dependent"”.
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Frequency dependent acoustic transmission in nonuniform materials
A one dimensional normalized model for the frequency response of the acoustic power transmitted through nonuniform materials is developed. Using the ideal mixture model to relate acoustic velocity and impedance, this normalized model demonstrates that the power transmission characteristics are …
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Frequency-Dependent Conduction Block In Demyelinating Focal Neuropathies
… initial studies of this thesis for evidence of frequency-dependent conduction block (FDB) by way of high-frequency nerve stimulation (HFNS) applied across the region of entrapment. The final studies examined whether FDB could be demonstrated along the median motor fibers in mild cases of CTS, …
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Hybrid Active/Passive Models with Frequency Dependent Damping
… are discretized using assumed modes method. The frequency dependent damping is modeled using the Golla-Hughes-McTavish (GHM) method and the system is analyzed in the time domain. GHM increases the size of the original system by adding fictitious dissipation coordinates that account for the …
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STRESS AND FREQUENCY DEPENDENT PROPERTIES OF POROELASTIC ANISOTROPIC ROCK
… of the pore pressure. This work offers an independent derivation of the tensor characteristics of α through elastic moduli, a microscopic effective medium derivation, and frequency-dependent behavior of α for an anisotropic medium. We derived simplified equations for isotropic rock subjected …
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Frequency-Dependent Hall Effect in Normal and Superconducting Metals
Made available in DSpace on 2015-05-12T17:12:24Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 6101646.PDF: 1943195 bytes, checksum: 4884751c0b4accb236de8b7a1d2510b4 (MD5) Previous issue date: 1961
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Design of frequency dependent impedance for transmission line modeling.
Thesis: Elec. E., Massachusetts Institute of Technology, Department of Electrical Engineering, 1972
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Frequency dependent impedance of stranded conductors using the subdivision method
Accurate determination of frequency dependent resistance of stranded conductors in transmission lines has not been thoroughly investigated for a wide frequency range of DCto 10 MHz. The main objective of this thesis project has been to write a computer program that calculates the resistance and …
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Time-Domain Simulation of Sound Propagation in Frequency-Dependent Materials
… dissertation investigates sound propagation in frequency-dependent materials. The study provides an improved understanding of how to numerically model the porous impedance materials more accurately under the conditions of complicated geometries. The finite difference time-domain (FDTD) method is …
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Multiscale simulation of frequency dependent line models and network equivalents
… the need to assess conditions where slow frequency oscillations might be combined with fast transients is becoming more common. This research evaluates the use of frequency dependent admittance-based models in the development of multiscale algorithms for phase-coordinate modeling of …
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Frequency dependent heat generation during vibrothermographic testing of composite materials
This investigation concerns the frequency dependent heat generation behavior and the heat generation mechanisms for the thermal patterns of delamination in fiber reinforced composites during a vibrothermographic test, which uses real time thermography as a nondestructive evaluation of a structure …
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A Finite Element, Reduced Order, Frequency Dependent Model of Viscoelastic Damping
… curve fit is expressed by minioscillators. The frequency dependence of the complex modulus is accounted for by the addition of internal, or dissipation, coordinates. The dissipation coordinates make the viscoelastic model several times larger than the original. The trade off for more accurate …
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Frequency Dependent Mechanical Properties of Elastic Metamaterials with Locally Resonant Microstructures
Frequency dependent mechanical properties of elastic metamaterials with locally resonant microstructures were investigated. Due to the dynamic behavior of the microstructures, the mechanical properties of these elastic metamaterials, if represented by effective continuous media, would exhibit …
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Mode Matching sensing in Frequency Dependent Squeezing Source for Advanced Virgo plus
… year. This result was also possible due to the Frequency Independent Squeezing (FIS) implementation, which improved the Virgo detection range for the coalescence between two Binary Neutron Start (BNS) of 5-8\%. However, this incredible result was dramatically limited by different technical …
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Lines of descent in population genetics models with mutation and frequency-dependent selection
… (ASG) has provided great insight into the type-frequency evolution of a population, both backwards and forwards in time. The aim of this thesis is to capitalize on these ideas further in order to tackle the case of mutation and frequency–dependent selection, which we represent as an analytic …
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Characterizing a Racing Damper's Frequency Dependent Behavior with an Emphasis on High Frequency Inputs
… always been assumed to be primarily velocity dependent, little work has gone into exploring damper's frequency dependent nature. Therefore, this study evaluates the effect input frequency has on the damper's output force. Utilizing experimental testing, with a state of the art damper …
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Numerical methods for frequency dependent line parameters with applications to microstrip lines and pipe-type cables
… first. With signal transients containing the frequency of interest, traditional formulae are inappropriate to calculate line parameters because of skin and proximity effects. A common strategy is to apply the subdivision principle — to subdivide the line conductors into smaller parts so that …
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An investigation of the excitation frequency dependent behavior of fiber reinforced epoxy composites during vibrothermographic inspection
This investigation concerns the frequency related behavior of delaminations in fiber reinforced composites during vibrothermography, the use of active thermography with a mechanical excitation for the nondestructive evaluation of a structure or part. Two models, one where the size and geometry of …
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