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Showing 1 to 16 of 16 for “"surface-wave propagation"”.
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Surface Wave Propagation and Global Crustal Tomography
… calculate Born sensitivity kernels for Rayleigh-wave phase and amplitude measurements that are valid in regions near seismic stations. Calculations of sensitivity kernels for inter-station measurements show that exact travelling-wave representation of Green tensor is necessary when station …
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Surface wave propagation in 3-D anelastic media
Lateral perturbations in anelasticity (Q) and wave speed together provide important constraints on thermal and chemical structures in the mantle. In present-day tomography studies of global wave speed and anelasticity, the significance of 3-D wave speed and 3-D Q structures on surface wave travel …
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Exploiting Near Field and Surface Wave Propagation for Implanted Devices
… be employed. Additionally, taking advantage of surface wave propagation permits the use of single-wire RF transmission lines in biological tissue, offering more efficient signal routing over near field coupling resulting in controlled implant depth at low power budgets.</p><p>Due to the …
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Modelling of Electromagnetic Surface Wave Propagation for High-Speed Communications
Surface waves have been known as a low-loss electromagnetic mode supported by a single conductor for well over a century but little research has been dedicated to surface wave interactions with its surroundings and surface wave propagation on printed circuit boards and on multiple wires. This …
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Seismicity, tectonics, and surface wave propagation in the central Andes
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Sciences, 1983.
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Mechanical and psychophysical studies of surface wave propagation during vibrotactile stimulation
… of the present research was to determine how the surface waves induced by vibrotactile stimulation of the skin varied as a function of the site on the body where the motors were mounted, and how these waves influenced the ability to localize vibrotactile stimulation. Three locations on the body …
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Nonlinear Response of Plasmas to Electromagnetic Waves and Surface Wave Propagation in Magneto Plasmas
Made available in DSpace on 2014-12-04T21:03:33Z (GMT). No. of bitstreams: 1 6206250.pdf: 6391604 bytes, checksum: 017cd5b217842464a8dc61c85d4105ea (MD5) Previous issue date: 1962
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Imaging surface acoustic waves in anisotropic and periodic media
A new technique has been developed for studying surface acoustic wave propagation. The technique, which uses non-contact immersion transducers to excite and detect ultrasound with frequencies between 1 and 20 MHz, allows convenient examination of surface waves traveling in arbitrary directions on a …
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Rayleigh Wave Acoustic Emission during Crack Propagation in Steel
… was conducted of the existence of seismic surface pulses (SSP) on crack faces in near-failure fatigue. An SSP has components of various modes of wave propagation. The component with the largest amplitude is a Rayleigh surface wave pulse. The possibility that these surface modes have much …
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Homogenization of Structured Metasurfaces and Uniaxial Wire Medium Metamaterials for Microwave Applications
In recent years, the study of electromagnetic wave interaction with artificial media has been the subject of intense research interest due to their extraordinary properties such as negative refraction, partial focusing, enhanced transmission, and spatial filtering, among others. Artificial media …
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Optical transient grating measurements of micro/nanoscale thermal transport and mechanical properties
… in bulk and nanostructured semiconductors and surface wave propagation in a monolayer of micron sized spheres. In the transient grating technique two picosecond pulses are crossed to generate a spatially periodic intensity profile. The spatially periodic profile generates a material excitation …
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Variable grid finite-difference modeling including surface topography
… modeling method for highly complex surface topography and subsurface structures. Realistic modeling of seismic wave propagation in the near surface region is complicated by many factors, such as strong heterogeneity, topographic relief and large attenuation. In order to account for …
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Wave Engineering in Time Modulated, Nonlinear, and Anisotropic Metamaterials
<p>Leveraging wave matter interactions is central to a myriad of electromagnetic wave-based applications. During the past decades, research on extreme wave manipulation has been revolutionized by artificially engineered materials (metamaterials) and by adding new aspects to the wave-matter …
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Multistation Methods for Geotechnical Characterization using Surface Waves
… with soil characterization methods based on surface wave propagation applied to geotechnical engineering purposes. This topic has gained much interest in the last decade because of the appealing possibilities given by non-invasive methods, which are at once very flexible and cost effective. …
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Threat and Application of Frequency-Agile Radio Systems
… confirmed by field link measurements and ocean-surface wave propagation simulations. We propose to combine this radio with an energy harvesting buoy so that the radio can operate independently on the ocean and form a wireless mesh network with other similar radios.
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Surface Wave Analysis in Laterally Varying Media
This work studies the possibility of using surface wave analysis as a tool for a robust estimation of the S-wave velocity behaviour in laterally varying media. The surface wave method, in fact, can be effectively adopted for different purposes and at different scales, but I focused on the …