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 32 for “"Doppler Shifts"”.
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Doppler shifts in the KATRIN experiment
… tritium is simulated to study the effects of "Doppler shifts" in the energy of the emitted electrons due to the random thermal motion and fluid flow velocity of the differentially pumped tritium gas. Simulated spectra are presented for three different neutrino masses and the relative effects of …
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The Role of Actively Created Doppler shifts in Bats Behavioral Experiments and Biomimetic Reproductions
… on target direction into time-frequency Doppler signatures. These species were thought to be evolutionarily tuned to Doppler shifts generated by a prey's wing beat. Self-generated Doppler shifts from the bat's own flight motion were for the most part considered a nuisance that the bats …
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A spectroscopic investigation of an argon glow discharge
… a prism spectrograph in order to determine if a Doppler shift occurs. No Doppler shifts were observed; however, further refinements in equipment and technique are required before it can be reported that no Doppler shifts exists. Feasibility of removable end plate construction of discharge tubes …
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Phase splitting
… electrodeless discharge in hydrogen in which the Doppler shifts would be exhibited in a regular manner.
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The effects of moving electron density fluctuations on time domain reflectometry in plasmas
… in this work is a study of the effects of Doppler shifts resulting from moving density fluctuations in the electron density profile of the sheath.
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Fabry-Perot Observations of Midlatitude Neutral Winds and Atmospheric Gravity Wave Activity
… Daytona Beach, FL campus was used to measure Doppler shifts in the atomic oxygen green line emission which originates from an altitude of 96 km. The process of extracting the horizontal winds from the detected Doppler shifts and the resulting time series of the zonal and meridional winds at …
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Comparison of quadrature detector and phase-locked loop demodulator performance with LEOSAT applications
… varying carrier to noise ratios and simulated Doppler shifts, as might be expected for a low earth orbit satellite downlink. Experimental comparison between a quadrature detector and a phase-locked loop demodulator shows that phase-locked loop demodulators and quadrature detectors offer …
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A Scanning Bi-static SODAR
… receiver is crucial for the effect on measured Doppler shifts. The Doppler shifts of individual receivers are least effected if the beam width ratio is approximately one. However, it is predicted that multiple receivers, with beam widths different from the transmitter, can be suitably combined …
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Direct Observation of Nodal Quasiparticles in the Non-Magnetic Superconductors Yttrium(lutetium)nickel-Boron-Carbon Field-Angle Dependent Heat Capacity
… confirming that quasiparticles are created via Doppler shifts at a line of zeros normal to . These results demonstrate that field-angle-dependent heat capacity can be a powerful tool in probing the momentum-space gap structure in unconventional superconductors such as high Tc cuprates, …
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Exploring data compression for a distributed aerial relay application
… robust against differential delay and Doppler shifts across the array.
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Determination of the Parameter Limits for Artificial Non-random Microwave Signal Detection
<p>The Doppler shift of small bandwidth (several Hertz) microwave signals makes identification of spectral features difficult; the Doppler individual bandwidth shift can be a factor of hundreds or thousands of times greater than the bandwidth. A computer model supplied by the National Aeronautics …
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Construction of a Calcium Matter-Wave Interferometer
… Our experimental design minimizes first-order Doppler shifts, and allows for the cancellation of systematic errors including phase shifts due to rotation and acceleration. I describe the individual components of the interferometer and its assembly. The requirements for the electronics used in …
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Inversion of Arecibo incoherent scatter radar coded long pulse backscatter spectra
… particle temperatures, ion concentrations, and Doppler shifts caused by particle motions can be estimated by inverting the power spectra of received scatter signals to the numerially implemented ISR forward spectral model in the frequency domain. Power spectrum estimates are derived by taking …
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Cochlear morphology and sound-induced motion of the apical mammalian inner ear
… scattering tissues in the inner ear. By sensing Doppler shifts of light scattered off moving structures in the inner ear, the OCT system can also detect sound-induced motions of cochlear structures with sub-nanometer resolution. This thesis demonstrates the use of the OCT system to study the …
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Estimation of planetary wave parameters from the data of the 1981 ocean acoustic tomography experiment
… wave periods significantly by producing large Doppler shifts. The waves were dynamically stable to the mean flow, had weak nonlinear interactions with each other and did not form a resonant traid; thus they constituted a fully linear solution. Evidence for the existence of the waves was …
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Design and analysis of ground stations for Pacsat applications
… to that of an appropriate coherent receiver. Doppler shifts on the channel is particularly important for PACSAT communications. An analysis approach that addresses the mistuning problem is presented. Results of this analysis identify changes that would better suit the needs of PACSAT terminals.
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Digital signal processing techniques for optical coherence tomography : OCT and OCT image enhancement
… of the spectrum with increasing imaging depth, Doppler shifts induced by the optical path length scanner, and determination of an optimal spectroscopic metric were addressed. To improve the quality of ultrahigh resolution OCT images, wavelet processing techniques for speckle noise reduction were …
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Modal analysis of vertical array receptions for the Heard Island Feasibility Test
… was used to obtain a 25 dB increase in SNR. Doppler shifts for each transmission event were predicted from available parameters and were found to be within ±2 mHz of the measured shifts. The modal analysis employed two methods: comparing variations in signal energy with depth to the vertical …
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Laboratory Measurements of the Millimeter Wavelength Opacity of Phosphine (PH3) and Ammonia (NH3) Under Simulated Conditions for the Cassini-Saturn Encounter
… occultation simulator used to calculate excess Doppler shifts and attenuation profiles for Saturn, utilizing the newest formalisms for phosphine and ammonia. The results indicate that there will be unambiguous detection and profiling of phosphine and ammonia, and predictions are made for the …
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Integration and testing of a digital transceiver for a dual frequency, pulse-doppler radar
… active node is essentially a monostatic pulse-doppler radar. Laboratory tests of the transceiver showed that it was possible to generate and digitize pulsed waveforms at a 125 MHz intermediate frequency which is used by the existing receiver exciter in the system. After extensive laboratory …
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