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 111 for “"frequency dependence"”.
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The Frequency Dependence of Dislocation Damping in Single Crystal Copper
Made available in DSpace on 2014-12-10T17:57:49Z (GMT). No. of bitstreams: 1 6711862.pdf: 1742627 bytes, checksum: a5db531bc548e59a42f6c3753899b745 (MD5) Previous issue date: 1967
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Frequency dependence on the temperature in nuclear quadrupole resonance of sodium bromate
The pure quadrupole resonant frequency dependence on temperature of the Br<sup>79</sup> isotope was examined from 4.2°K to 346°K. These data were fitted with the Bayer theory as extended by Kushida. The inequality of the two assumed modes of bromate-group vibration as well as the possibility of …
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Biophysical mechanisms of frequency-dependence and its neuromodulation in neurons in oscillatory networks
… input, many isolated neurons exhibit a preferred frequency response in their voltage amplitude and phase shift. Membrane potential resonance (MPR), a maximum amplitude in a neuron’s input impedance at a non-zero frequency, captures the essential subthreshold properties of a neuron, which may …
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Frequency dependence of the conductivity and dielectric constant of single crystal La₂CuO₄₊y̳
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 1990.
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THE FREQUENCY-DEPENDENCE OF THE NMR LONGITUDINAL RELAXATION RATE, T(1)(-1), OF WATER IN CYSTS OF THE BRINE SHRIMP (ARTEMIA)
… of water is independent of the Larmor frequency, (omega)/2(pi), in the normal rf range. However, T(,1)('-1) of intracellular water in biological systems, which accounts for as much as 80% of the cell mass, is frequency-dependent. This indicates that the NMR properties of water in the …
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Dynamic stiffness and damping prediction on rubber material parts, FEA and experimental correlation
… overlay method proposed by Austrell concerning frequency dependence of the dynamic modulus and loss angle that is known to increase more with frequency for small amplitudes than for large amplitudes is developed. The original version of the overlay method yields no difference in frequency …
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Modeling of Shock Wave Propagation and Attenuation in Viscoelastic Structures
… Since shock transients have a broadband frequency spectrum, it is imperative to properly model frequency dependence of material parameters. The Anelastic Displacement Fields (ADF) method is employed to develop new axisymmetric and plane stress finite elements that are capable of modeling …
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Transport Properties and Noise of Low -Dimensional Conductors
In the second part, the frequency dependence of conductance and Johnson-Nyquist noise is calculated for one-dimensional wires and two-dimensional films. In low-dimensional conductors, collective effects become important even at low frequencies and lead to the predicted novel effects. Two different …
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The determination of QLg and Qc as a function of frequency in the crust of Virginia and its environs
… = Q<sub>(Lg,C)</sub>(1 Hz) and N represents the frequency dependence. The study area is located in the Appalachian region of Virginia and eastern Tennessee, containing three areas of regionally high seismicity: the central Virginia, Giles County, and eastern Tennessee seismic zones. The …
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Transport Properties And Noise Of Low-Dimensional Conductors
… (perpendicular to the planes) and (2) the frequency dependence of the noise and conductance of one- and two-dimensional conductors. Both topics stress the potential importance of collective charge fluctuations in low-dimensional conductors. The thesis consists of two (almost) independent …
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Spin-lattice relaxation of trivalent praseodymium, terbium, and erbium in anhydrous lanthanum trichloride: Temperature and magnetic field dependence
… saturation method, operating at a microwave frequency of 15.5 GHz. Through additional measurements of our own and of others on the same samples at 9 GHz, we were able to check the frequency (or field) dependence of the relaxation rates. The non-Kramers Pr:LaC13 system was bottlenecked in the …
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Effect of reverberation on the directional sensitivity of auditory neurons : peripheral factors
… We also investigated the nature of the frequency dependence observed in the degradation of directional coding due to reverberation. Based on our experimental results and the results of an auditory model, we argue that in addition to being affected by AN fibers' synchrony to stimulus fine …
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Acoustic measurements of flowing and quasi-static particulate suspensions
… acoustic properties were measured over three frequency ranges, requiring a variety of different measuring techniques: Plane wave region (200 -4 kHz): the attenuation of plane waves travelling along the flow tube was measured. A simple method of measuring the characteristic impedance of the …
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Mechanisms of Target Discrimination by the Echolocating Bat, Vampyrum Spectrum
… intensity cues, but to encourage the use of the frequency dependent properties of the echoes. Of the five bats begun on this problem, two learned the discrimination with an accuracy of 70% or better. Because the elimination of overall intensity differences was contingent upon the point at which …
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Seismic Response of Structures with Added Viscoelastic Dampers
… model to correctly describe the frequency dependence of the damper. The fractional derivative model and the general linear model are capable of capturing the frequency dependence of viscoelastic materials accurately. In our research, therefore, we have focused on the development …
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Mixing And Transport In The Kelvin-Stuart Cat Eyes Driven Flow Using The Topological Approximation Method
… (2001) of the driven or perturbed flow indicated frequency dependence of the transport. One goal of the present research is to derive an analytical expression for the transport and to study its dependence upon the perturbation frequency ù. The Kelvin-Stuart Cat Eyes dynamical system consists of an …
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The effect of hydrostatic pressure on the ionic conductivity of some crystals with the flourite structure
… temperature independent. The temperature dependence of the ionic conductivity has also been studied in all of the above materials. Good agreement with published results is obtained except in the cases of PbCl2 and PbBr2. The differences in those two cases are attributed to differences in …
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Resource competition and soft selection in Sabatia angularis
… individuals. Chapter 4 looks at the role of frequency-dependence and its interaction with density dependence, across both juvenile and adult life history stages. I followed the fate of either selfed or outcrossed individuals in pots at two different densities and a gradient of frequencies of …
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A nano-stepping robotic instrumentation platform
… and control. The device step size and its frequency dependence are examined. A novel, high-resolution capacitive probe concept is detailed and characterized as an example of an inexpensive, low-power, sensor technology with which an ANT may be equipped to perform scanning probe microscopy. …
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