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 7908 for “"Wave"”.
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Features of nonlinear wave-wave and wave-body interactions
Although nonlinear water waves have been the subject of decades of research, there are many problems that remain unsolved, especially in the cases when one or more of the following factors are involved: high-order nonlinear effects, moving boundaries, wavestructure interactions and complicated …
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Terrestrial radio wave propagation at millimeter-wave frequencies
This research focuses on radio wave propagation at millimeter-wave frequencies. A measurement based channel characterization approach is taken in the investigation. First, measurement techniques are analyzed. Three types of measurement systems are designed, and implemented in measurement campaigns: …
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On wave-wave interactions on the ocean surface
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Civil Engineering, 1992.
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Chemical and Thermochemical Wave Behavior in Multiphase Fluid Flow Through Permeable Media: Wave-Wave Interactions
… reactive flow. These regions are separated by waves, which mark the change in composition from one region to the next. We develop a theory which elucidates the interactions of these chemical waves with those formed from other flowing phenomena. We consider the following interactions: 1.) the …
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Field investigation comparing conventional compressional-wave, converted-wave, and horizontally-polarized shear-wave reflections, A
Includes bibliographical references.
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Novel Devices for Terahertz Wave Imaging, Wave-guiding and Sensing
… which were designed to manipulate terahertz waves for broadband near-field imaging, wave-guiding (invisible space), and sensing (resonator), are presented in this thesis. We developed the original working concepts of each device, and demonstrated the prototype experimentally in our lab. The …
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A Significant Wave
<p><em>A Significant Wave</em> is an original collection of 35 poems accompanied by a critical introduction to the work.</p>
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Square Wave Titrimetry
Made available in DSpace on 2014-12-05T19:36:25Z (GMT). No. of bitstreams: 1 0018145.pdf: 5004548 bytes, checksum: 7fc88dac23e75b573b4bb4900fe62d36 (MD5) Previous issue date: 1956
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Nondispersive wave packets
In this work, nondispersive wave packet solutions to linear partial differential equations are investigated. These solutions are characterized by infinite energy content; otherwise, they are continuous, nonsingular and propagate in free space without spreading out. Examples of such solutions are …
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Path Following using Frequency Modulated Continuous Wave millimetre-wave Automotive Radar
… to only use Frequency Modulated Continuous Wave (FMCW) radar. Radar has shown to be semi-invariant to inclement weather such as snow, fog, extremely lighting conditions, and heavy rain. Traditionally, autonomous vehicle (AV) path planning algorithms use multiple introceptive and …
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Wave tailoring granular materials: effect of randomness and plane wave propagation
… in material and geometric properties on wave propagation behavior in 1D and 2D granular media. Results obtained for both 1D chains and 2D media show the kinetic energy amplitude decays with distance, with the rate of decay found to depend on the level of randomness and the distance from …
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Nonlinear gravity wave-wind interactions and jet stream gravity wave generation.
Thesis. 1977. Ph.D.--Massachusetts Institute of Technology. Dept. of Earth and Planetary Sciences.
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Role of Planetary Wave-Tide-Gravity Wave Interactions In Whole Atmosphere Coupling
… sites and compared to a co-located sodium lidar. Wave-wave interactions in the mesosphere and lower thermosphere (MLT) that may be responsible for the penetration of six-day periodicities into the Earth's ionosphere during the 2019 Southern Hemispheric (SH) SSW are first investigated. This study …
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Stochastic electron trajectories and wave interaction in relativistic gyro-traveling wave amplifiers
Gyro-traveling-wave amplifiers (gyro-TWAs) are types of gyrodevices, which take advantage of the cyclotron maser instability to produce coherent electromagnetic (EM) radiation from electrons gyrating in an external magnetic field and interacting with fast traveling waves. For high power …
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Wave reflections from breakwaters
… The technique is applicable to an array of wave gauges of arbitrary geometry deployed seaward of the reflector. An expansion for small oblique wave incidence angles is used to derive an approximate relationship between measured array cross-spectra and a small number of parameters that …
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∫Stung by a wave≈
The following is a curated selection of biographical materials, poetic observations, amateur scientific and psychological inquiries mixed with a dash of extraterrestrial, spiritual, or otherworldly unknowing and finished off with philosophical meanderings that toe the line with anti-anxiety …
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Wave energy resource assessment
… altimeter data for spatial mapping of the wave resource is examined.<br/>A new algorithm for estimating wave period from altimeter data is developed and<br/>validated, which enables estimates of wave energy converter (WEC) power to be<br/>derived. Maps of the long-term mean WEC power from …
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