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 151 for “"Frequency Spectrum"”.
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Two-probe techniques to measure wavenumber-frequency spectrum of VTF plasma
Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1999.
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Investigation into the impedance and communication requirements for the low voltage distribution line in the high frequency spectrum
… in high speed data transmission to the high frequency band of IMHz and upwards over the low-voltage segment below the distribution transformers.' Since the power line is designed for transmission of power instead of signal transmitting originally; it has many shortages when used as a signal …
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Effects of blood vessel permeability on mechanical properties of bone under micro-gravity conditions
… fluid flow. A method of exposure to bio-frequency spectrum (BFS) light (infrared to micrometer wavelength) was used to increase the blood vessel permeability. We tested the hypothesis by examining the bone mechanical properties (Young's modulus) of rat femur and humerus for four groups of …
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The Wave Structure Function And Temporal Frequency Spread In Weak To Strong Optical Turbulence
… expressions for the wave structure function, frequency spread of the temporal frequency spectrum, and the temporal frequency spectrum of optical signals propagating through a random medium, specifically the Earth’s atmosphere. The results are believed to be valid for all optical turbulence …
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Nonlinear effects near an explosions
… the size of this nonlinear region and the frequency spectrum of the elastic signal. The computation of the size of the shattered zone, shows that this region is bounded by a so called "Critical Radius," which occurs when the shock wave pressure caused by the explosion decreases in value …
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High-resolution multi-wavelength study of the jet in 3C273
… observations reveal a flattening of the high-frequency spectrum of the jet, a surprising feature which cannot be accounted for by any single-population synchrotron model. Both the observed flattening of the high-frequency spectrum and the X-ray emission from the jet can be explained by a model …
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Generalized Terminal Modeling of Electro-Magnetic Interference
… circuit is created for applications in the frequency domain. Impedances and current / voltage sources define the noise throughout the entire EMI frequency spectrum. All parameters needed to create the model are clearly defined to ensure convergence and maximize accuracy. The model is then …
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Cognitive Radar Applied To Target Tracking Using Markov Decision Processes
The radio-frequency spectrum is a precious resource, with many applications and users, especially with the recent spectrum auction in the United States. Future platforms and devices, such as radars and radios, need to be adaptive to their spectral environment in order to continue serving the needs …
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Investigating the role of antenna parameters in reducing interference
The frequency spectrum is a necessary resource for the proper functioning of wireless devices. With the unprecedented rise of wireless devices available to the public comes inevitable congestion in the frequency spectrum. As this congestion is increasing, there is a pressing need to investigate …
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Effect of Control Techniques on the Performance of Semiactive Dampers
… the sprung and unsprung body displacement, the frequency spectrum of acceleration, and the frequency spectrum of the rattle space. In addition, the system response to a step input is calculated and, lastly, time traces are calculated, one at a time, for system excitations at the sprung and …
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Some effects of subdivision of finite populations on genetic diversity measures
… model.;Moments of the multidimensional frequency spectrum of order n correspond to probabilities of identity for n genes drawn from specified subpopulations. Recursions are developed for moments of arbitrary order.;Several authors have studied the second moments of frequency spectrums …
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Arc Fault Circuit Interrupter Development for Residential DC Electricity
… Our method is primarily based on comparing the frequency spectrum of current flowing through the circuit during an arcing event to a known characteristic spectrum. Once an arc has been identified, our interrupter is capable of responding adequately to eliminate the arc. Hardware tests show the …
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Measurement of the total electron-hydrogen scattering cross section for the Project 8 experiment
… radiation signals from single electrons. The frequency spectrum showed that there are frequency jumps between each track. Using the simulation package, Kassiopeia, data collected on June 2014 were compared against Monte Carlo scattering predictions. This thesis presents the analysis of these …
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Measurements of the horizontal directionality of the ambient acoustic noise in Monterey Bay, California
… aimed along the four cardinal directions and the frequency spectrum of the output was obtained. The frequency range of the system response was from 10 to 2500 Hz. Results are presented in the form of differences between the spectral energy bins in each direction and the average over all …
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The Generation and Detection of Squeezed Microwave Photons Realized using Traveling-Wave Parametric Amplifiers
… extends the existing JTWPA design to a lower frequency spectrum in the hundreds of MHz regime and demonstrates broadband parametric amplification with a large gain. Capable of multiplexed readout and improved signal-to-noise ratio, the new JTWPA can be utilized in a wide range of applications …
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Horizontal directional spectrum estimation of the Heard Island transmissions
… to form an estimate of the directional power spectrum. This spectrum determines if any horizontal multipath is detectable. The preliminary signal conditioning, including frequency spectrum estimation and demodulation required before beamforming is described. Conventional and adaptive …
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Nonlinear effects in surface gravity waves
… resonant transfer of energy within a continuous spectrum of water waves is considered.� Using a transfer equation derived by LonguetHigg: ins (1975) for narrow spectra, and choosing suitable simple forms for these spectra, we make accurate evaluations of the energy transfer rate as a function of …
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A 0.78mm² Co-Channel Interference Canceller in 130nm SOI RF CMOS with Novel Passive Phase Shifters and Combiner Circuitry
An increasingly congested frequency spectrum has presented an unfortunate opportunity for two independent radios on the same device to exist co-channel. Currently, co-channel coexistence requires temporal scheduling to prevent co-channel interference from disrupting downlink communications. This …
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Analysis of natural frequencies of concert harp soundboard shapes
… harp were determined by impulse response and the frequency spectrum was compared with the modeled frequencies for soundboard and strings. It was determined that many of the important frequencies in the region under 250 Hz could be attributed to the strings. Powerful resonances and clusters …
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Value of Machine Learning and Cognition on Target Tracking
In recent years previously restricted radio-frequency spectrum has been opened to civilian and industrial access in the United States. Because of this, high priority users such as the military and government need to develop systems that can adapt to the surrounding spectral environment which will …
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