subject:(Wave diffraction)

Delft University of Technology

1. Guzman Mardones, C.A. (author). Impact of access channel geometry on wave penetration in harbours.

Degree: 2011, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:1ba13e2e-ba4e-4802-9366-92f7fc00bdfa

►

Access channels (entrance channels) to ports are a relevant part of port facilities, and they have a strong influence on the port operations as well.… (more)

Subjects/Keywords: access channel; wave propagation; diffraction

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APA (6^th Edition):

Guzman Mardones, C. A. (. (2011). Impact of access channel geometry on wave penetration in harbours. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:1ba13e2e-ba4e-4802-9366-92f7fc00bdfa

Chicago Manual of Style (16^th Edition):

Guzman Mardones, C A (author). “Impact of access channel geometry on wave penetration in harbours.” 2011. Masters Thesis, Delft University of Technology. Accessed March 04, 2021. http://resolver.tudelft.nl/uuid:1ba13e2e-ba4e-4802-9366-92f7fc00bdfa.

MLA Handbook (7^th Edition):

Guzman Mardones, C A (author). “Impact of access channel geometry on wave penetration in harbours.” 2011. Web. 04 Mar 2021.

Vancouver:

Guzman Mardones CA(. Impact of access channel geometry on wave penetration in harbours. [Internet] [Masters thesis]. Delft University of Technology; 2011. [cited 2021 Mar 04]. Available from: http://resolver.tudelft.nl/uuid:1ba13e2e-ba4e-4802-9366-92f7fc00bdfa.

Council of Science Editors:

Guzman Mardones CA(. Impact of access channel geometry on wave penetration in harbours. [Masters Thesis]. Delft University of Technology; 2011. Available from: http://resolver.tudelft.nl/uuid:1ba13e2e-ba4e-4802-9366-92f7fc00bdfa

Delft University of Technology

2. Maroudi, Konstantina (author). Advanced modelling of wave penetration in ports.

Degree: 2019, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:a824d040-5176-4a2c-9890-2831c1bab3b4

► A main challenge port engineers had to tackle in recent years is wave penetration inside a harbour, as it determines vessels’ safe sailing and mooring,… (more)

▼ A main challenge port engineers had to tackle in recent years is wave penetration inside a harbour, as it determines vessels’ safe sailing and mooring, possibly causes unwanted vessel movements, and unequivocally regulates the execution of port operations. A physical scale model can describe wave penetration in a complete way. However, the construction of a physical scale model is expensive and time consuming. For this reason, nowadays several numerical models are used to describe wave penetration in ports, affected by multiple processes such as diffraction, partial reflection, etc. In this study, the simulation of wave penetration with the non-hydrostatic model SWASH is examined. To validate the numerical model, output of an open benchmark dataset of Deltares (Deltares, 2016) is used, consisting of physical scale model tests of schematic port layouts. As wave penetration is a summation of physical processes, each process should be described accurately by SWASH. This thesis focuses on assessing how SWASH models wave penetration per wave process, first separately by means of simplified models and then combined in a model describing the full harbour layout resulting to the final wave field inside a port. The main topics of interest of the formulated research questions are the ability of SWASH to simulate wave propagation, wave celerity and the effect of two dominant wave processes: reflection and diffraction. As the amount of processes influencing wave penetration increases for higher layout complexity, the research was targeted at the simplest port layout considered in the benchmark dataset (Deltares, 2016). Moreover, only regular waves were taken into account, as in this case the differences between the measurements and the computational results are most easily identified. To better understand the influence of reflection the waves, two simplified one-dimensional SWASH models were designed. The first model simulated reflection in front of a gravel slope, located outside the harbour basin, and the second model reflection in front of the harbour basin end, consisting of a gravel slope and a concrete quay wall behind it. The results suggest that outside the basin the reflection off the gravel slope has a minor effect in comparison to the reflection off a vertical quay wall. Inside the harbour basin, wave reflection played a dominant role on the resulting wave field there. The SWASH models were proven to be robust as the wave height in the computational domain did not change considerably for an increase or decrease of the porosity of a gravel slope by 10%. It should be emphasised that the standing wave heights were altering fast within a short horizontal distance. Therefore, the precise wave height values were strongly influenced by the exact location of the output points examined. The importance of diffraction inside the harbour was demonstrated by a simplified two-dimensional model, in which reflection off the harbour end was not included. The information that could be obtained from the measurements about the wave… Advisors/Committee Members: van Koningsveld, Mark (mentor), Zijlema, Marcel (graduation committee), van der Hout, Arne (graduation committee), Reijmerink, S.P. (graduation committee), Delft University of Technology (degree granting institution).

Subjects/Keywords: wave penetration; port; wave modelling; SWASH; Reflection; Diffraction; Harbour

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APA (6^th Edition):

Maroudi, K. (. (2019). Advanced modelling of wave penetration in ports. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:a824d040-5176-4a2c-9890-2831c1bab3b4

Chicago Manual of Style (16^th Edition):

Maroudi, Konstantina (author). “Advanced modelling of wave penetration in ports.” 2019. Masters Thesis, Delft University of Technology. Accessed March 04, 2021. http://resolver.tudelft.nl/uuid:a824d040-5176-4a2c-9890-2831c1bab3b4.

MLA Handbook (7^th Edition):

Maroudi, Konstantina (author). “Advanced modelling of wave penetration in ports.” 2019. Web. 04 Mar 2021.

Vancouver:

Maroudi K(. Advanced modelling of wave penetration in ports. [Internet] [Masters thesis]. Delft University of Technology; 2019. [cited 2021 Mar 04]. Available from: http://resolver.tudelft.nl/uuid:a824d040-5176-4a2c-9890-2831c1bab3b4.

Council of Science Editors:

Maroudi K(. Advanced modelling of wave penetration in ports. [Masters Thesis]. Delft University of Technology; 2019. Available from: http://resolver.tudelft.nl/uuid:a824d040-5176-4a2c-9890-2831c1bab3b4

University of Southern California

3. Amornwongpaibun, Alongkorn. Diffraction of anti-plane (SH) waves by surface elliptical topographies in an elastic half-space.

Degree: PhD, Civil Engineering, 2011, University of Southern California

URL: http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll127/id/659137/rec/1992

► The study presented in this dissertation aims at the ground motion assessment of various two-dimensional hill models subjected to incident plane SH waves in an… (more)

▼ The study presented in this dissertation aims at the ground motion assessment of various two-dimensional hill models subjected to incident plane SH waves in an elastic half-space. The exact, analytic solutions to the boundary-valued problem, based on method of wave function expansion in elliptical coordinate are presented. These require the technique of angular half-range expansion in elliptical coordinate to deal with mixed-boundary condition arisen during mathematical implementation of all hill models; the traction-free boundary condition at the surface of the elliptical hill and the continuity of displacement and stress at the semi-elliptical interface. ❧ In the study we found out that the existence of a hill results in complex pattern of surface displacement. Generally for nearly grazing angle, a hill shields the propagating waves, resulting in a standing wave pattern in the coming direction and the focusing of the amplitude at the far edge of the hill. In addition the presence of full-elliptical tunnels resulted in more prominent standing waves, and amplitudes of ground motion in the neighborhood of unity or less on the far end may be monitored without the abrupt jump at that edge of the. We discovered that the presence of a full-elliptical tunnel amplifies maximum displacement by 30%-70% from corresponding value of reference (inexistence of a tunnel) for the horizontal incidence and de-amplifies maximum displacement in the range of 1%-15% for the vertical incidence; note that these amplifying and de-amplifying effects are dependent on the size of tunnels. The bigger the tunnel is, the stronger the effects are. ❧ We also found out that the effect of the semi-elliptical tunnels on ground surface motion is dissimilar to the effect of the full-elliptical ones. Since horizontal incidences are able to slip underneath semi-tunnels, the weaker standing waves on the left side and weaker shadow zones associated with high jumps of the displacement amplitude at the far edge of the hill are observed. However, when the incident waves are nearly vertical, the stronger shielding effect due to semi-elliptical tunnels than to full-elliptical ones are detected. It could be said that the hinder efficiency of an elliptical tunnel depends on the direction of wave passage; the tunnel becomes better obstruction when the incidence is propagating normal to its major axis. Advisors/Committee Members: Lee, Vincent W. (Committee Chair), Wong, Hung Leung (Committee Member), Udwadia, Firdaus E. (Committee Member).

Subjects/Keywords: anti-plane wave; diffraction; elliptical; scattering; SH wave

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APA (6^th Edition):

Amornwongpaibun, A. (2011). Diffraction of anti-plane (SH) waves by surface elliptical topographies in an elastic half-space. (Doctoral Dissertation). University of Southern California. Retrieved from http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll127/id/659137/rec/1992

Chicago Manual of Style (16^th Edition):

Amornwongpaibun, Alongkorn. “Diffraction of anti-plane (SH) waves by surface elliptical topographies in an elastic half-space.” 2011. Doctoral Dissertation, University of Southern California. Accessed March 04, 2021. http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll127/id/659137/rec/1992.

MLA Handbook (7^th Edition):

Amornwongpaibun, Alongkorn. “Diffraction of anti-plane (SH) waves by surface elliptical topographies in an elastic half-space.” 2011. Web. 04 Mar 2021.

Vancouver:

Amornwongpaibun A. Diffraction of anti-plane (SH) waves by surface elliptical topographies in an elastic half-space. [Internet] [Doctoral dissertation]. University of Southern California; 2011. [cited 2021 Mar 04]. Available from: http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll127/id/659137/rec/1992.

Council of Science Editors:

Amornwongpaibun A. Diffraction of anti-plane (SH) waves by surface elliptical topographies in an elastic half-space. [Doctoral Dissertation]. University of Southern California; 2011. Available from: http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll127/id/659137/rec/1992

Virginia Tech

4. Xue, Jing. Wavefront Healing and Tomographic Resolution of Mantle Plumes.

Degree: MS, Geosciences, 2014, Virginia Tech

URL: http://hdl.handle.net/10919/50423

► To investigate seismic resolution of deep mantle plumes as well as the robustness of the anti-correlation between bulk sound speed and S wave speed imaged… (more)

Subjects/Keywords: Seismic tomography; Computational seismology; Theoretical seismology; Wave scattering and diffraction; Wave propagation

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APA (6^th Edition):

Xue, J. (2014). Wavefront Healing and Tomographic Resolution of Mantle Plumes. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/50423

Chicago Manual of Style (16^th Edition):

Xue, Jing. “Wavefront Healing and Tomographic Resolution of Mantle Plumes.” 2014. Masters Thesis, Virginia Tech. Accessed March 04, 2021. http://hdl.handle.net/10919/50423.

MLA Handbook (7^th Edition):

Xue, Jing. “Wavefront Healing and Tomographic Resolution of Mantle Plumes.” 2014. Web. 04 Mar 2021.

Vancouver:

Xue J. Wavefront Healing and Tomographic Resolution of Mantle Plumes. [Internet] [Masters thesis]. Virginia Tech; 2014. [cited 2021 Mar 04]. Available from: http://hdl.handle.net/10919/50423.

Council of Science Editors:

Xue J. Wavefront Healing and Tomographic Resolution of Mantle Plumes. [Masters Thesis]. Virginia Tech; 2014. Available from: http://hdl.handle.net/10919/50423

University of Alberta

5. Subramanian, Venkat Raghavan. Fabrication of Bragg gratings in silicon-on-insulator waveguides.

Degree: MS, Department of Electrical and Computer Engineering, 2002, University of Alberta

URL: https://era.library.ualberta.ca/files/5m60qt52c

Subjects/Keywords: Diffraction gratings.; Optical wave guides.

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APA (6^th Edition):

Subramanian, V. R. (2002). Fabrication of Bragg gratings in silicon-on-insulator waveguides. (Masters Thesis). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/5m60qt52c

Chicago Manual of Style (16^th Edition):

Subramanian, Venkat Raghavan. “Fabrication of Bragg gratings in silicon-on-insulator waveguides.” 2002. Masters Thesis, University of Alberta. Accessed March 04, 2021. https://era.library.ualberta.ca/files/5m60qt52c.

MLA Handbook (7^th Edition):

Subramanian, Venkat Raghavan. “Fabrication of Bragg gratings in silicon-on-insulator waveguides.” 2002. Web. 04 Mar 2021.

Vancouver:

Subramanian VR. Fabrication of Bragg gratings in silicon-on-insulator waveguides. [Internet] [Masters thesis]. University of Alberta; 2002. [cited 2021 Mar 04]. Available from: https://era.library.ualberta.ca/files/5m60qt52c.

Council of Science Editors:

Subramanian VR. Fabrication of Bragg gratings in silicon-on-insulator waveguides. [Masters Thesis]. University of Alberta; 2002. Available from: https://era.library.ualberta.ca/files/5m60qt52c

University of Manchester

6. Gongora Orozco, Nalleli. Experimental studies on internal shock wave phenomena and interactions.

Degree: 2010, University of Manchester

URL: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:88710

► Unsteady shock waves are formed by the coalescence of pressure waves. The attenuationof pressure and shock waves in general is of great importance in a… (more)

▼ Unsteady shock waves are formed by the coalescence of pressure waves. The attenuationof pressure and shock waves in general is of great importance in a wide varietyof application such as vehicle performance, health and safety. Previous researcheshave been carried out on a variety of geometries to understand the physics. Theaim of this project is to advance the previous-state-of-the-art and to shed furtherlight into the fundamental physics associated with the shock wave interactions andphenomena.Shock wave attenuation was studied by using rough walls in a three-pipe system.The roughness at the walls is added by placing grooves on the upper and lower wallsof the junctions. The angles of the branch pipe were varied from 30 to 150 degrees.Shock wave interactions with a co-flow jet were also examined. All the experimentswere performed for driver gas (air) pressures of 4, 8, and 12 bar and atmosphericpressure within the driven section, giving theoretical Mach number of 1.34, 1.54, and1.66, respectively. Three different velocities, 114, 138, and 178 m/s, were used forthe co-flow jet. High-speed schlieren photography, particle image velocimetry (PIV),and pressure measurements techniques were employed to visualise and quantify theflow field.Expansion and compression waves produced by the grooves led to a highly unsteadyflow field, an increase to the pressure upstream, and the formation of asecondary shock wave. The pressure of the incident shock front was reduced by anestimated 20%. A maximum of 10% reduction of velocity of the shock front at theexit was achieved. The shock vortex/ structure led to multiple reflections, distortionof the vortical field, a lambda-shock configuration and pressure fluctuations. Theinfluence of the co-flow jet dissipated the shock/vortex structure, and attenuatedthe pressure peaks caused by multiple reflections.Complementing this investigation the testing of pressure sensitive paints (PSP)for the use of unsteady and high speed flows was carried out. The results showedthat the use of luminophores with high intensity output, and pressure sensitivityapplied on a porous material were the most suitable PSPs for these applications. Advisors/Committee Members: Kontis, Konstantinos.

Subjects/Keywords: shock wave; diffraction; reflection

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Gongora Orozco, N. (2010). Experimental studies on internal shock wave phenomena and interactions. (Doctoral Dissertation). University of Manchester. Retrieved from http://www.manchester.ac.uk/escholar/uk-ac-man-scw:88710

Chicago Manual of Style (16^th Edition):

Gongora Orozco, Nalleli. “Experimental studies on internal shock wave phenomena and interactions.” 2010. Doctoral Dissertation, University of Manchester. Accessed March 04, 2021. http://www.manchester.ac.uk/escholar/uk-ac-man-scw:88710.

MLA Handbook (7^th Edition):

Gongora Orozco, Nalleli. “Experimental studies on internal shock wave phenomena and interactions.” 2010. Web. 04 Mar 2021.

Vancouver:

Gongora Orozco N. Experimental studies on internal shock wave phenomena and interactions. [Internet] [Doctoral dissertation]. University of Manchester; 2010. [cited 2021 Mar 04]. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:88710.

Council of Science Editors:

Gongora Orozco N. Experimental studies on internal shock wave phenomena and interactions. [Doctoral Dissertation]. University of Manchester; 2010. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:88710

University of Manchester

7. Gongora Orozco, Nalleli. Experimental studies on internal shock wave phenomena and interactions.

Degree: PhD, 2010, University of Manchester

URL: https://www.research.manchester.ac.uk/portal/en/theses/experimental-studies-on-internal-shock-wave-phenomena-and-interactions(6325f185-76a1-483a-9d14-606a6a48374e).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.558030

► Unsteady shock waves are formed by the coalescence of pressure waves. The attenuationof pressure and shock waves in general is of great importance in a… (more)

▼ Unsteady shock waves are formed by the coalescence of pressure waves. The attenuationof pressure and shock waves in general is of great importance in a wide varietyof application such as vehicle performance, health and safety. Previous researcheshave been carried out on a variety of geometries to understand the physics. Theaim of this project is to advance the previous-state-of-the-art and to shed furtherlight into the fundamental physics associated with the shock wave interactions andphenomena. Shock wave attenuation was studied by using rough walls in a three-pipe system. The roughness at the walls is added by placing grooves on the upper and lower wallsof the junctions. The angles of the branch pipe were varied from 30 to 150 degrees. Shock wave interactions with a co-flow jet were also examined. All the experimentswere performed for driver gas (air) pressures of 4, 8, and 12 bar and atmosphericpressure within the driven section, giving theoretical Mach number of 1.34, 1.54, and1.66, respectively. Three different velocities, 114, 138, and 178 m/s, were used forthe co-flow jet. High-speed schlieren photography, particle image velocimetry (PIV),and pressure measurements techniques were employed to visualise and quantify theflow field. Expansion and compression waves produced by the grooves led to a highly unsteadyflow field, an increase to the pressure upstream, and the formation of asecondary shock wave. The pressure of the incident shock front was reduced by anestimated 20%. A maximum of 10% reduction of velocity of the shock front at theexit was achieved. The shock vortex/ structure led to multiple reflections, distortionof the vortical field, a lambda-shock configuration and pressure fluctuations. Theinfluence of the co-flow jet dissipated the shock/vortex structure, and attenuatedthe pressure peaks caused by multiple reflections. Complementing this investigation the testing of pressure sensitive paints (PSP)for the use of unsteady and high speed flows was carried out. The results showedthat the use of luminophores with high intensity output, and pressure sensitivityapplied on a porous material were the most suitable PSPs for these applications.

Subjects/Keywords: 533; shock wave; diffraction; reflection

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Gongora Orozco, N. (2010). Experimental studies on internal shock wave phenomena and interactions. (Doctoral Dissertation). University of Manchester. Retrieved from https://www.research.manchester.ac.uk/portal/en/theses/experimental-studies-on-internal-shock-wave-phenomena-and-interactions(6325f185-76a1-483a-9d14-606a6a48374e).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.558030

Chicago Manual of Style (16^th Edition):

Gongora Orozco, Nalleli. “Experimental studies on internal shock wave phenomena and interactions.” 2010. Doctoral Dissertation, University of Manchester. Accessed March 04, 2021. https://www.research.manchester.ac.uk/portal/en/theses/experimental-studies-on-internal-shock-wave-phenomena-and-interactions(6325f185-76a1-483a-9d14-606a6a48374e).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.558030.

MLA Handbook (7^th Edition):

Gongora Orozco, Nalleli. “Experimental studies on internal shock wave phenomena and interactions.” 2010. Web. 04 Mar 2021.

Vancouver:

Gongora Orozco N. Experimental studies on internal shock wave phenomena and interactions. [Internet] [Doctoral dissertation]. University of Manchester; 2010. [cited 2021 Mar 04]. Available from: https://www.research.manchester.ac.uk/portal/en/theses/experimental-studies-on-internal-shock-wave-phenomena-and-interactions(6325f185-76a1-483a-9d14-606a6a48374e).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.558030.

Council of Science Editors:

Gongora Orozco N. Experimental studies on internal shock wave phenomena and interactions. [Doctoral Dissertation]. University of Manchester; 2010. Available from: https://www.research.manchester.ac.uk/portal/en/theses/experimental-studies-on-internal-shock-wave-phenomena-and-interactions(6325f185-76a1-483a-9d14-606a6a48374e).html ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.558030

Delft University of Technology

8. De Lange, P.H.M. (author). Golfdoordringing in een haven.

Degree: 1992, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:41601bba-3421-48b4-9b63-5b60f47f719c

►

Het doel van dit onderzoek is de invloed te onderzoeken van refractie en diffractie bij zowel langkammige als kortkammige golven bij een haven(-ingang). Dit onderzoek… (more)

Subjects/Keywords: diffraction; harbour tranquility; wave penetration

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APA (6^th Edition):

De Lange, P. H. M. (. (1992). Golfdoordringing in een haven. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:41601bba-3421-48b4-9b63-5b60f47f719c

Chicago Manual of Style (16^th Edition):

De Lange, P H M (author). “Golfdoordringing in een haven.” 1992. Masters Thesis, Delft University of Technology. Accessed March 04, 2021. http://resolver.tudelft.nl/uuid:41601bba-3421-48b4-9b63-5b60f47f719c.

MLA Handbook (7^th Edition):

De Lange, P H M (author). “Golfdoordringing in een haven.” 1992. Web. 04 Mar 2021.

Vancouver:

De Lange PHM(. Golfdoordringing in een haven. [Internet] [Masters thesis]. Delft University of Technology; 1992. [cited 2021 Mar 04]. Available from: http://resolver.tudelft.nl/uuid:41601bba-3421-48b4-9b63-5b60f47f719c.

Council of Science Editors:

De Lange PHM(. Golfdoordringing in een haven. [Masters Thesis]. Delft University of Technology; 1992. Available from: http://resolver.tudelft.nl/uuid:41601bba-3421-48b4-9b63-5b60f47f719c

Delft University of Technology

9. Doorn, N. (author). Diffraction in a spectral wave model.

Degree: 1997, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:995f7333-a19a-4c33-97eb-99624c101238

►

Waves that approach the coast and encounter obstacles such as small islands, rocks or breakwaters may be reflected backwards and in lateral directions, but the… (more)

▼

Waves that approach the coast and encounter obstacles such as small islands, rocks or breakwaters may be reflected backwards and in lateral directions, but the wave crest may also bend around the obstacle. This phenomenon can be described with refraction-diffraction models based on the Boussinesq equation or the mild-slope equation of Berkhoff. However, these models are computationally very demanding since they require a high spatial resolution. Moreover, physical phenomena such as wind generation or depth induced breaking are not readily accounted for. Inclusion of diffraction in a spectral wave model would eliminate these drawbacks. Similar to refraction the effect of diffraction can be represented as a transport of wave energy through spectral space (in the directional domain). Two ad hoc proposals are made to include diffraction in the model SWAN, which is a fully spectral model based on the action balance equation. The first proposal to describe this diffraction-induced turning rate is derived from the mild-slope equation for monochromatic, long-crested waves. It depends on the second order spatial derivative of the wave amplitude. Adding the diffraction term made the model unstable. The second proposal to describe the diffraction-induced turning rate is based on the first-order spatial gradient of the wave field. The transport of wave energy along the wave crests is proportional to the first-order derivative of the energy along the crest. The model is tested for three different cases: the academic case of monochromatic, unidirectional waves near a semi-infinite breakwater, a realistic harbour and the Bay of Viano do Castelo (Portugal). In areas with considerable wave motion the influence of diffraction is relatively unimportant. In other regions the gradientapproach for diffraction seems to give a realistic estimate for the wave field.

Hydraulic Engineering

Civil Engineering and Geosciences

Advisors/Committee Members: Holthuijsen, L.H. (mentor), Booij, N. (mentor), Battjes, J.A. (mentor).

Subjects/Keywords: wave model; SWAN; diffraction

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APA (6^th Edition):

Doorn, N. (. (1997). Diffraction in a spectral wave model. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:995f7333-a19a-4c33-97eb-99624c101238

Chicago Manual of Style (16^th Edition):

Doorn, N (author). “Diffraction in a spectral wave model.” 1997. Masters Thesis, Delft University of Technology. Accessed March 04, 2021. http://resolver.tudelft.nl/uuid:995f7333-a19a-4c33-97eb-99624c101238.

MLA Handbook (7^th Edition):

Doorn, N (author). “Diffraction in a spectral wave model.” 1997. Web. 04 Mar 2021.

Vancouver:

Doorn N(. Diffraction in a spectral wave model. [Internet] [Masters thesis]. Delft University of Technology; 1997. [cited 2021 Mar 04]. Available from: http://resolver.tudelft.nl/uuid:995f7333-a19a-4c33-97eb-99624c101238.

Council of Science Editors:

Doorn N(. Diffraction in a spectral wave model. [Masters Thesis]. Delft University of Technology; 1997. Available from: http://resolver.tudelft.nl/uuid:995f7333-a19a-4c33-97eb-99624c101238

Michigan State University

10. Watson, Claude M. Demonstration of Fresnel interference by means of a ripple tank.

Degree: MS, 1958, Michigan State University

URL: http://etd.lib.msu.edu/islandora/object/etd:8293

Subjects/Keywords: Diffraction; Wave theory of light

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APA (6^th Edition):

Watson, C. M. (1958). Demonstration of Fresnel interference by means of a ripple tank. (Masters Thesis). Michigan State University. Retrieved from http://etd.lib.msu.edu/islandora/object/etd:8293

Chicago Manual of Style (16^th Edition):

Watson, Claude M. “Demonstration of Fresnel interference by means of a ripple tank.” 1958. Masters Thesis, Michigan State University. Accessed March 04, 2021. http://etd.lib.msu.edu/islandora/object/etd:8293.

MLA Handbook (7^th Edition):

Watson, Claude M. “Demonstration of Fresnel interference by means of a ripple tank.” 1958. Web. 04 Mar 2021.

Vancouver:

Watson CM. Demonstration of Fresnel interference by means of a ripple tank. [Internet] [Masters thesis]. Michigan State University; 1958. [cited 2021 Mar 04]. Available from: http://etd.lib.msu.edu/islandora/object/etd:8293.

Council of Science Editors:

Watson CM. Demonstration of Fresnel interference by means of a ripple tank. [Masters Thesis]. Michigan State University; 1958. Available from: http://etd.lib.msu.edu/islandora/object/etd:8293

University of Arizona

11. Quintenz, Jeffrey Paul, 1949-. SLOTS IN A PARALLEL PLATE WAVEGUIDE .

Degree: 1975, University of Arizona

URL: http://hdl.handle.net/10150/289321

Subjects/Keywords: Electromagnetic waves – Diffraction.; Wave guides.

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APA (6^th Edition):

Quintenz, Jeffrey Paul, 1. (1975). SLOTS IN A PARALLEL PLATE WAVEGUIDE . (Doctoral Dissertation). University of Arizona. Retrieved from http://hdl.handle.net/10150/289321

Chicago Manual of Style (16^th Edition):

Quintenz, Jeffrey Paul, 1949-. “SLOTS IN A PARALLEL PLATE WAVEGUIDE .” 1975. Doctoral Dissertation, University of Arizona. Accessed March 04, 2021. http://hdl.handle.net/10150/289321.

MLA Handbook (7^th Edition):

Quintenz, Jeffrey Paul, 1949-. “SLOTS IN A PARALLEL PLATE WAVEGUIDE .” 1975. Web. 04 Mar 2021.

Vancouver:

Quintenz, Jeffrey Paul 1. SLOTS IN A PARALLEL PLATE WAVEGUIDE . [Internet] [Doctoral dissertation]. University of Arizona; 1975. [cited 2021 Mar 04]. Available from: http://hdl.handle.net/10150/289321.

Council of Science Editors:

Quintenz, Jeffrey Paul 1. SLOTS IN A PARALLEL PLATE WAVEGUIDE . [Doctoral Dissertation]. University of Arizona; 1975. Available from: http://hdl.handle.net/10150/289321

University of Arizona

12. Ehrlich, Jeffrey Ellis. Nonlinear grating structures in indium antimonide waveguides.

Degree: 1989, University of Arizona

URL: http://hdl.handle.net/10150/184914

► This dissertation describes various nonlinear grating coupling phenomena in InSb waveguides. InSb exhibits an opto-thermal, diffusive nonlinearity at 9.6μm. This nonlinearity strongly modifies the growth… (more)

Subjects/Keywords: Diffraction gratings; Wave guides

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APA (6^th Edition):

Ehrlich, J. E. (1989). Nonlinear grating structures in indium antimonide waveguides. (Doctoral Dissertation). University of Arizona. Retrieved from http://hdl.handle.net/10150/184914

Chicago Manual of Style (16^th Edition):

Ehrlich, Jeffrey Ellis. “Nonlinear grating structures in indium antimonide waveguides. ” 1989. Doctoral Dissertation, University of Arizona. Accessed March 04, 2021. http://hdl.handle.net/10150/184914.

MLA Handbook (7^th Edition):

Ehrlich, Jeffrey Ellis. “Nonlinear grating structures in indium antimonide waveguides. ” 1989. Web. 04 Mar 2021.

Vancouver:

Ehrlich JE. Nonlinear grating structures in indium antimonide waveguides. [Internet] [Doctoral dissertation]. University of Arizona; 1989. [cited 2021 Mar 04]. Available from: http://hdl.handle.net/10150/184914.

Council of Science Editors:

Ehrlich JE. Nonlinear grating structures in indium antimonide waveguides. [Doctoral Dissertation]. University of Arizona; 1989. Available from: http://hdl.handle.net/10150/184914

University of Texas – Austin

13. Decker, Luke Adam. Seismic diffraction imaging methods and applications.

Degree: MSin Geological Sciences, Geological Sciences, 2014, University of Texas – Austin

URL: http://hdl.handle.net/2152/32553

► Seismic waves can either be reflected or diffracted by subsurface objects depending on the object's geometry. Diffactions can be used to determine details about the… (more)

▼ Seismic waves can either be reflected or diffracted by subsurface objects depending on the object's geometry. Diffactions can be used to determine details about the small-scale features that generate them, such as karsts, voids, pinchouts, faults, fractures, and salt flanks. Diffraction imaging can have resolution below the typical seismic wavelength. Scattered waves are recorded as significantly lower-energy signal than reflected waves, requiring that diffractions be separated from reflections. I describe three methods of such separation: data-domain plane-wave destruction, Fresnel zone Elimination, and partial-image plane-wave destruction. Once separated, diffractions can be migrated to create a seismic diffraction image and used in velocity analysis. Common-reflection angle migrated diffractions appear flat in dip angle gathers when migrated with correct velocity. I illustrate how this property can be used to determine migration velocity through a process of oriented velocity continuation (OVC). In OVC framework diffraction data are decomposed by slope and migrated over a range of velocities. Velocities corresponding to the flattest slope gathers are picked using semblance as a measure of flatness. This provides an estimate of migration velocity. Stacking gathers corresponding to this chosen velocity generates a seismic diffraction image. Seismic diffraction images provide interpreters with information about small-scale geologic objects that may not be available in conventional images. Scattering features that are interesting for exploration, like voids, caves, fractures, and faults, cause diffractions and can be resolved with better focus in diffraction images than in conventional ones. This is particularly useful with geologically complex carbonate systems. Carbonates are strongly heterogeneous, making them difficult to image with conventional methods. Reservoir porosity is often contained within caves, or small vugs. These features are difficult to characterize with conventional methods because cave reflections have large geometric uncertainties in cave size and location. Velocity analysis of seismic reflection data in carbonates may not highlight vugular porosity particularity well. I illustrate how diffraction images provide improved characterization by highlighting the edges of caves, thus constraining cave geometry, and highlighting more heterogenous zones by measuring the amount of scattering those zones generate. Advisors/Committee Members: Fomel, Sergey B. (advisor), Ren, Kui (committee member), Wilson, Clark (committee member).

Subjects/Keywords: Seismic; Diffraction; Imaging; Plane-wave; Velocity; Seismic interpretation

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APA (6^th Edition):

Decker, L. A. (2014). Seismic diffraction imaging methods and applications. (Masters Thesis). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/32553

Chicago Manual of Style (16^th Edition):

Decker, Luke Adam. “Seismic diffraction imaging methods and applications.” 2014. Masters Thesis, University of Texas – Austin. Accessed March 04, 2021. http://hdl.handle.net/2152/32553.

MLA Handbook (7^th Edition):

Decker, Luke Adam. “Seismic diffraction imaging methods and applications.” 2014. Web. 04 Mar 2021.

Vancouver:

Decker LA. Seismic diffraction imaging methods and applications. [Internet] [Masters thesis]. University of Texas – Austin; 2014. [cited 2021 Mar 04]. Available from: http://hdl.handle.net/2152/32553.

Council of Science Editors:

Decker LA. Seismic diffraction imaging methods and applications. [Masters Thesis]. University of Texas – Austin; 2014. Available from: http://hdl.handle.net/2152/32553

The Ohio State University

14. Mikuteit, Siegfried. Mutual coupling in a three-element, parallel-plate waveguide array by wedge diffraction and surface integration techniques .

Degree: PhD, Graduate School, 1967, The Ohio State University

URL: http://rave.ohiolink.edu/etdc/view?acc_num=osu1486643980688137

Subjects/Keywords: Engineering; Wave guides; Diffraction

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APA (6^th Edition):

Mikuteit, S. (1967). Mutual coupling in a three-element, parallel-plate waveguide array by wedge diffraction and surface integration techniques . (Doctoral Dissertation). The Ohio State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=osu1486643980688137

Chicago Manual of Style (16^th Edition):

Mikuteit, Siegfried. “Mutual coupling in a three-element, parallel-plate waveguide array by wedge diffraction and surface integration techniques .” 1967. Doctoral Dissertation, The Ohio State University. Accessed March 04, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=osu1486643980688137.

MLA Handbook (7^th Edition):

Mikuteit, Siegfried. “Mutual coupling in a three-element, parallel-plate waveguide array by wedge diffraction and surface integration techniques .” 1967. Web. 04 Mar 2021.

Vancouver:

Mikuteit S. Mutual coupling in a three-element, parallel-plate waveguide array by wedge diffraction and surface integration techniques . [Internet] [Doctoral dissertation]. The Ohio State University; 1967. [cited 2021 Mar 04]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1486643980688137.

Council of Science Editors:

Mikuteit S. Mutual coupling in a three-element, parallel-plate waveguide array by wedge diffraction and surface integration techniques . [Doctoral Dissertation]. The Ohio State University; 1967. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1486643980688137

The Ohio State University

15. Balanis, Constantine A. Radiation from slots on cylindrical bodies using geometrical theory of diffraction and creeping wave theory.

Degree: PhD, Graduate School, 1969, The Ohio State University

URL: http://rave.ohiolink.edu/etdc/view?acc_num=osu1486651333550034

Subjects/Keywords: Engineering; Radiation; Diffraction; Wave-motion

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APA (6^th Edition):

Balanis, C. A. (1969). Radiation from slots on cylindrical bodies using geometrical theory of diffraction and creeping wave theory. (Doctoral Dissertation). The Ohio State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=osu1486651333550034

Chicago Manual of Style (16^th Edition):

Balanis, Constantine A. “Radiation from slots on cylindrical bodies using geometrical theory of diffraction and creeping wave theory.” 1969. Doctoral Dissertation, The Ohio State University. Accessed March 04, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=osu1486651333550034.

MLA Handbook (7^th Edition):

Balanis, Constantine A. “Radiation from slots on cylindrical bodies using geometrical theory of diffraction and creeping wave theory.” 1969. Web. 04 Mar 2021.

Vancouver:

Balanis CA. Radiation from slots on cylindrical bodies using geometrical theory of diffraction and creeping wave theory. [Internet] [Doctoral dissertation]. The Ohio State University; 1969. [cited 2021 Mar 04]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1486651333550034.

Council of Science Editors:

Balanis CA. Radiation from slots on cylindrical bodies using geometrical theory of diffraction and creeping wave theory. [Doctoral Dissertation]. The Ohio State University; 1969. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1486651333550034

16. Bellec, Ewen. Study of charge density wave materials under current by X-ray diffraction : Étude de matériaux onde de densité de charge sous courant par diffraction de rayons X.

Degree: Docteur es, Physique, 2019, Université Paris-Saclay (ComUE)

URL: http://www.theses.fr/2019SACLS437

►

Ce manuscrit a pour sujet principal la diffraction par rayons X des matériaux ondes de densité de charges (ODC). Nous avons étudié le cristal quasi-1D… (more)

▼

Ce manuscrit a pour sujet principal la diffraction par rayons X des matériaux ondes de densité de charges (ODC). Nous avons étudié le cristal quasi-1D NbSe3 ainsi que le quasi-2D TbTe3. Plusieurs grands instruments ont été utilisés pour cette étude, le synchrotron ESRF de Grenoble sur la ligne ID01 ainsi que le laser à électron libre LCLS à Stanford. Premièrement, grâce à la cohérence du faisceau X à LCLS, nous avons pu observer une perte de cohérence transverse dans NbSe3 lors de l’application d’un courant électrique au-dessus d’un certain seuil ainsi qu’une compression longitudinale de l’ODC. Ensuite, à l’ESRF, nous avons utilisé un faisceau X focalisé au micromètre par une Fresnel zone plate pour scanner l’ODC localement par diffraction sur NbSe3 puis ensuite sur TbTe3. Lorsqu’un courant est appliqué sur l’échantillon, nous avons observé une déformation transverse indiquant que l’ODC est bloquée au niveau de la surface de l’échantillon dans NbSe3. Dans le cas de TbTe3, l’ODC tourne sous courant présentant un cycle d’hystérésis lorsque le courant passe continument de positif à négatif. Nous avons aussi pu constater dans plusieurs régions, toujours pour TbTe3, la création de défauts d’irradiation localisés induisant une compression-dilatation de l’ODC. Dans une dernière partie théorique, nous montrons comment la théorie du transport électrique de l’ODC par un train de solitons portants chacun une charge ainsi que la prise en compte du blocage de l’ODC sur la surface de l’échantillon que nous avons vu expérimentalement permet de comprendre plusieurs mesures de résistivité en fonction des dimensions de l’échantillon trouvées dans la littérature. Nous présentons ensuite plusieurs idées pour expliquer du blocage de l’ODC sur les surfaces au niveau microscopique et proposons l’hypothèse d’une ODC commensurable en surface (et incommensurable dans le volume).

The main subject of this manuscript is the X-ray diffraction of charge density wave (CDW) materials. We studied the quasi-1D NbSe3 crystal and the quasi-2D TbTe3. Several large instruments facilities were used for this study, the ESRF synchrotron in Grenoble on the ID01 line and the LCLS free electron laser in Stanford. First, thanks to the coherence of the X-beam at LCLS, we were able to observe a loss of transverse coherence in NbSe3 when applying an electrical current above a certain threshold as well as a longitudinal compression of the CDW. Then, at the ESRF, we used an X-ray beam focused on the micrometer scale by a Fresnel zone plate to scan the CDW locally by diffraction on NbSe3 and on TbTe3. When a current is applied to the sample, we observed a transverse deformation indicating that the CDW is pinned on the sample surface in NbSe3. In the case of TbTe3, the CDW rotates under current showing a hysteresis cycle when one is continuously changing from positive to negative current. We have also observed in several regions, in TbTe3, the creation of localized irradiation defects inducing a compression-dilation of the CDW. In a last theoretical part, we show…

Advisors/Committee Members: Le Bolloc'h, David (thesis director).

Subjects/Keywords: Onde de densité de charge; Incommensurable; Diffraction; Rayons X; Micro-diffraction; Soliton; Charge density wave; Incommensurate; Diffraction; X-ray; Micro-diffraction; Soliton; 530

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APA (6^th Edition):

Bellec, E. (2019). Study of charge density wave materials under current by X-ray diffraction : Étude de matériaux onde de densité de charge sous courant par diffraction de rayons X. (Doctoral Dissertation). Université Paris-Saclay (ComUE). Retrieved from http://www.theses.fr/2019SACLS437

Chicago Manual of Style (16^th Edition):

Bellec, Ewen. “Study of charge density wave materials under current by X-ray diffraction : Étude de matériaux onde de densité de charge sous courant par diffraction de rayons X.” 2019. Doctoral Dissertation, Université Paris-Saclay (ComUE). Accessed March 04, 2021. http://www.theses.fr/2019SACLS437.

MLA Handbook (7^th Edition):

Bellec, Ewen. “Study of charge density wave materials under current by X-ray diffraction : Étude de matériaux onde de densité de charge sous courant par diffraction de rayons X.” 2019. Web. 04 Mar 2021.

Vancouver:

Bellec E. Study of charge density wave materials under current by X-ray diffraction : Étude de matériaux onde de densité de charge sous courant par diffraction de rayons X. [Internet] [Doctoral dissertation]. Université Paris-Saclay (ComUE); 2019. [cited 2021 Mar 04]. Available from: http://www.theses.fr/2019SACLS437.

Council of Science Editors:

Bellec E. Study of charge density wave materials under current by X-ray diffraction : Étude de matériaux onde de densité de charge sous courant par diffraction de rayons X. [Doctoral Dissertation]. Université Paris-Saclay (ComUE); 2019. Available from: http://www.theses.fr/2019SACLS437

UCLA

17. Li, Xiaoqiang. New resonances, gratings, and slow-wave structures based on 2D periodic structures.

Degree: Electrical Engineering, 2018, UCLA

URL: http://www.escholarship.org/uc/item/67m263v1

► Periodic structure is made of a finite or infinite repetition of a unit cell in one, two or three dimensions. It has been intensively investigated… (more)

▼ Periodic structure is made of a finite or infinite repetition of a unit cell in one, two or three dimensions. It has been intensively investigated in electromagnetics and widely used in metamaterials, metasurfaces, photonic crystals, frequency selective surfaces (FSS), slow-wave structures, diffraction gratings, etc. Metamaterials and metasurfaces are subsets of periodic structures whose unit cell is much smaller than the wavelength. By proper design of the sub-wavelength unit cell of a periodic structure, its macro properties can be engineered as we wish. This dissertation introduces three novel devices/phenomena which are based on 2D metamaterials/metasurfaces. This dissertation has three sections.In section I, a new resonance phenomenon is demonstrated in waveguide cavities, which simultaneously uses two orthogonal modes (polarizations). This resonance is formed by bouncing waves with similar handedness, between two simple anisotropic metasurfaces having a relative rotation angle. The tilted anisotropic metasurfaces can cross-couple the waves from one polarization to the other at the cavity end. The field profile of the resonant mode does not exhibit nodes and antinodes, thus the resonant frequency is not solely determined by the cavity length. The resonance condition is theoretically demonstrated from both field and transmission-line perspectives, and is validated by simulations showing the existence of the new resonance. The concept is experimentally demonstrated in an X-band dual-mode circular waveguide, demonstrating a very short cavity resonance. The concept brings new possibilities for resonator design with size and tunability benefits at different frequencies.In section II, a metasurface diffraction grating for circularly polarized (CP) incident wave operating at 10 GHz is introduced. Such structure can provide strong auto-collimation for the CP incident wave. Unlike the conventional scatterer, which would typically reverse the handedness of the incident CP wave upon reflection, the proposed grating can preserve the handedness. strong auto-collimation blazing effect and handedness preservation are achieved with specially designed reactive impedance surface, which allows independent control of the responses to transverse electric (TE) and transverse magnetic (TM) polarization. Simulation and measurement are carried out to demonstrate such effect, and comparison with conventional sawtooth grating is made.In section III, a novel slow-wave substrate integrated waveguide (SIW) is proposed and investigated. The slow-wave effect is achieved by the enhanced capacitance between the signal trace grid and periodic grounded patches on the same top layer. Such slow-wave effect can provide more than 40% size reduction in lateral dimension compared with the conventional SIW with the same cutoff frequency. Meanwhile, the longitudinal dimension can also be reduced by more than 40%. Two-pole bandpass filters (BPF) built from conventional SIW and proposed slow-wave SIW (SW-SIW) are compared through simulations and…

Subjects/Keywords: Electrical engineering; Electromagnetics; Diffraction Grating; Filter; Metasurface; Polarization Standing Wave; Slow-wave Structure; Substrate Integrated Waveguide

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APA (6^th Edition):

Li, X. (2018). New resonances, gratings, and slow-wave structures based on 2D periodic structures. (Thesis). UCLA. Retrieved from http://www.escholarship.org/uc/item/67m263v1

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Li, Xiaoqiang. “New resonances, gratings, and slow-wave structures based on 2D periodic structures.” 2018. Thesis, UCLA. Accessed March 04, 2021. http://www.escholarship.org/uc/item/67m263v1.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Li, Xiaoqiang. “New resonances, gratings, and slow-wave structures based on 2D periodic structures.” 2018. Web. 04 Mar 2021.

Vancouver:

Li X. New resonances, gratings, and slow-wave structures based on 2D periodic structures. [Internet] [Thesis]. UCLA; 2018. [cited 2021 Mar 04]. Available from: http://www.escholarship.org/uc/item/67m263v1.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Li X. New resonances, gratings, and slow-wave structures based on 2D periodic structures. [Thesis]. UCLA; 2018. Available from: http://www.escholarship.org/uc/item/67m263v1

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Canterbury

18. Eisazadeh Moghaddam, Arash. Pocket beach wave processes and current systems investigated via field and numerical modelling studies: A case study of Okains Bay.

Degree: PhD, Geography, 2015, University of Canterbury

URL: http://dx.doi.org/10.26021/7795

► Confined coasts in general, and pocket beach environments in particular, are under huge development pressures worldwide, not least due to their sheltered nature and perceived… (more)

▼ Confined coasts in general, and pocket beach environments in particular, are under huge development pressures worldwide, not least due to their sheltered nature and perceived shoreline stability. However, understanding of their physical functioning is poor in comparison to that of open coast beaches. This study aims to improve understanding in terms of the existing gaps in knowledge of wave processes and nearshore currents, and also to examine the importance of local wind and tide factors in generating nearshore currents, in micro-tidal pocket beaches. The boundaries of embayments are generally recognized as important controls of their beach processes and responses, yet little detailed knowledge exists of how the exact embayment dimensions and characteristics influences these processes. One key embayment feature the influence of which is poorly understood is the downcoast headland. In this thesis, field observations plus Zanuttigh and Van der Meer’s (2008) approach, and the SWAN wave model were used to evaluate the downcoast headland effects on wave processes within Okains Bay, an example pocket beach environment. The results showed that incident wave heights and directions were significantly influenced by wave reflection processes from the downcoast headland inside the bay. The intensity of reflection effects on wave characteristics inside the pocket beach varied according to approaching wave direction. Reflection effects reduced when waves approached from angles close to parallel to the headlands, increasing towards headland-perpendicular wave approaches. Field observations and the XBeach model were used to examine whether or not tides can significantly influence nearshore currents within example and model pocket beach environments. Results indicated that tides can be the primary driver of nearshore currents close to the bed inside micro-tidal pocket beaches, depending on incident wave conditions. In areas of micro-tidal pocket beaches exposed to direct approaching waves, currents were wave driven, while in areas further into the bay that experienced headland filtering of their wave environment, currents were mainly tide generated. The results of this study demonstrated how the current circulation system within micro-tidal pocket beaches is related to the incoming directions of offshore waves. If high energy waves approach oblique or normal to the shoreline (with the assumption that the shoreline is at 90° to the headlands), the current system was found to consist of longshore currents influenced by headlands, plus a rip current in the center of the shoreline or a toporip in proximity to headlands. The location of the rip current or toporip was determined by the direction of approaching incident waves. This study also examined the behavior of local winds in a pocket beach environment and their consequent effects on nearshore currents. Results for Okains Bay show that local winds tended to blow in offshore and onshore directions, as the bay is located in a valley, so orographic effects channel and shift the…

Subjects/Keywords: Pocket beach; Reflection; Diffraction; Downcoast headland; Upcoast headland; Wave height; Wave direction; Current systems; Tides; Local winds

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APA (6^th Edition):

Eisazadeh Moghaddam, A. (2015). Pocket beach wave processes and current systems investigated via field and numerical modelling studies: A case study of Okains Bay. (Doctoral Dissertation). University of Canterbury. Retrieved from http://dx.doi.org/10.26021/7795

Chicago Manual of Style (16^th Edition):

Eisazadeh Moghaddam, Arash. “Pocket beach wave processes and current systems investigated via field and numerical modelling studies: A case study of Okains Bay.” 2015. Doctoral Dissertation, University of Canterbury. Accessed March 04, 2021. http://dx.doi.org/10.26021/7795.

MLA Handbook (7^th Edition):

Eisazadeh Moghaddam, Arash. “Pocket beach wave processes and current systems investigated via field and numerical modelling studies: A case study of Okains Bay.” 2015. Web. 04 Mar 2021.

Vancouver:

Eisazadeh Moghaddam A. Pocket beach wave processes and current systems investigated via field and numerical modelling studies: A case study of Okains Bay. [Internet] [Doctoral dissertation]. University of Canterbury; 2015. [cited 2021 Mar 04]. Available from: http://dx.doi.org/10.26021/7795.

Council of Science Editors:

Eisazadeh Moghaddam A. Pocket beach wave processes and current systems investigated via field and numerical modelling studies: A case study of Okains Bay. [Doctoral Dissertation]. University of Canterbury; 2015. Available from: http://dx.doi.org/10.26021/7795

19. Nsengiyumva, Florence. Contribution à la détection d’objets sur pistes d’aéroport (FOD) par tomographie millimétrique en bande W et polarimétrie : Contribution to the detection of foreign objects debris (FODs) on airport runways using millimeter wave tomography in W band and polarimetry.

Degree: Docteur es, Électronique, 2016, Nice

URL: http://www.theses.fr/2016NICE4041

►

Les radars millimétriques en bande W (75-110 GHz) sont en plein essor, grâce notamment aux progrès des circuits intégrés, permettant de réaliser des systèmes compacts… (more)

▼

Les radars millimétriques en bande W (75-110 GHz) sont en plein essor, grâce notamment aux progrès des circuits intégrés, permettant de réaliser des systèmes compacts à bas coût et haute résolution due à la courte longueur d’onde. Dans un premier temps, ces systèmes ont été utilisés à des fins de détection et de localisation, avec à terme, pour objectif l’identification. Ainsi, des systèmes d’imagerie radar ont été développés, notamment grâce à l’imagerie qualitative, basée par exemple sur l’imagerie radar par synthèse d’ouverture (SAR). Cependant, afin de reconstruire les propriétés électromagnétiques des objets pour une identification complète, il est nécessaire de développer des algorithmes de reconstruction quantitatifs. Le travail présenté dans ce manuscrit est de poser les bases d’un système d’imagerie qualitative et quantitative en gamme millimétrique pour la détection et l’identification des objets sur les pistes d’aéroport par tomographie, tenant compte de la polarisation de l’onde incidente. Au cours de cette thèse, un outil de simulation permettant de la résolution des problèmes direct et inverse, pour les deux types de polarisation à deux dimensions 2D-TE et 2D-TM, basé sur la méthode des moments (MoM) a été développé. La première étape a consisté en la validation du problème direct en effectuant des comparaisons numériques avec des solutions analytiques pour des cibles canoniques. Ensuite, des mesures expérimentales ont été effectuées et comparées aux résultats numériques. Enfin, les résultats des reconstructions obtenus ont permis de valider l’algorithme de reconstruction 2D développé pour l’imagerie quantitative.

Millimeter-wave radar systems in W-band (75-110 GHz) are booming, due to advances in integrated circuits, allowing the fabrication of low-cost and high-resolution compact systems, thanks to the short wavelength. First, these systems were used for detecting and localizing purposes, with the aim of identification. Thus, imaging radar systems have been developed, especially using qualitative imaging, based for example, on Synthetic Aperture Radar (SAR). Nevertheless, in order to reconstruct the electromagnetic properties of objects, for a complete identification, we must develop quantitative reconstruction algorithms. The work presented in this manuscript is to give the basis of a qualitative and quantitative millimeter wave imaging system for detecting and identifying foreign debris on airport runways using tomography, taking into account the polarization of the incident wave. In this thesis, a simulation tool for solving forward and inverse problems, for the two-dimensional polarization cases 2D-TM and 2D-TE, based on the method of moments (MoM) has been developed. The first step was to study the validation of the direct problem by comparing numerical results with analytical solutions for canonical targets. Then, experimental measurements have ben carried out and compared with numerical results. Finally, reconstruction results obtained have validated the reconstruction algorithm developed…

Advisors/Committee Members: Pichot, Christian (thesis director).

Subjects/Keywords: Diffraction électromagnétique; Imagerie millimétrique; Diffraction inverse; Mesure de champ électrique en bande W; Electromagnetic scattering; Millimeter-wave imaging; Inverse scattering; Millimeter wave measurements in W-band

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APA (6^th Edition):

Nsengiyumva, F. (2016). Contribution à la détection d’objets sur pistes d’aéroport (FOD) par tomographie millimétrique en bande W et polarimétrie : Contribution to the detection of foreign objects debris (FODs) on airport runways using millimeter wave tomography in W band and polarimetry. (Doctoral Dissertation). Nice. Retrieved from http://www.theses.fr/2016NICE4041

Chicago Manual of Style (16^th Edition):

Nsengiyumva, Florence. “Contribution à la détection d’objets sur pistes d’aéroport (FOD) par tomographie millimétrique en bande W et polarimétrie : Contribution to the detection of foreign objects debris (FODs) on airport runways using millimeter wave tomography in W band and polarimetry.” 2016. Doctoral Dissertation, Nice. Accessed March 04, 2021. http://www.theses.fr/2016NICE4041.

MLA Handbook (7^th Edition):

Nsengiyumva, Florence. “Contribution à la détection d’objets sur pistes d’aéroport (FOD) par tomographie millimétrique en bande W et polarimétrie : Contribution to the detection of foreign objects debris (FODs) on airport runways using millimeter wave tomography in W band and polarimetry.” 2016. Web. 04 Mar 2021.

Vancouver:

Nsengiyumva F. Contribution à la détection d’objets sur pistes d’aéroport (FOD) par tomographie millimétrique en bande W et polarimétrie : Contribution to the detection of foreign objects debris (FODs) on airport runways using millimeter wave tomography in W band and polarimetry. [Internet] [Doctoral dissertation]. Nice; 2016. [cited 2021 Mar 04]. Available from: http://www.theses.fr/2016NICE4041.

Council of Science Editors:

Nsengiyumva F. Contribution à la détection d’objets sur pistes d’aéroport (FOD) par tomographie millimétrique en bande W et polarimétrie : Contribution to the detection of foreign objects debris (FODs) on airport runways using millimeter wave tomography in W band and polarimetry. [Doctoral Dissertation]. Nice; 2016. Available from: http://www.theses.fr/2016NICE4041

NSYSU

20. Chen, Ching-Yuan. Pressure and doping effects on the anomalous phase transition in ternary superconductor Bi2Rh3Se2.

Degree: Master, Physics, 2012, NSYSU

URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0723112-165505

► Bi2Rh3Se2 have been known as a charge-density-wave (CDW) superconductor, where the superconducting critical temperature Tc and the CDW phase transition are about 0.7 K and… (more)

Subjects/Keywords: superconductivity; charge-density-wave; structural transition; Bi2Rh3Se2; pressure effect; doping effect; selected area electron diffraction

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Chen, C. (2012). Pressure and doping effects on the anomalous phase transition in ternary superconductor Bi2Rh3Se2. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0723112-165505

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Chen, Ching-Yuan. “Pressure and doping effects on the anomalous phase transition in ternary superconductor Bi2Rh3Se2.” 2012. Thesis, NSYSU. Accessed March 04, 2021. http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0723112-165505.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Chen, Ching-Yuan. “Pressure and doping effects on the anomalous phase transition in ternary superconductor Bi2Rh3Se2.” 2012. Web. 04 Mar 2021.

Vancouver:

Chen C. Pressure and doping effects on the anomalous phase transition in ternary superconductor Bi2Rh3Se2. [Internet] [Thesis]. NSYSU; 2012. [cited 2021 Mar 04]. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0723112-165505.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Chen C. Pressure and doping effects on the anomalous phase transition in ternary superconductor Bi2Rh3Se2. [Thesis]. NSYSU; 2012. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0723112-165505

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

21. Alzaix, Benjamin. Mathematical and numerical analysis of the Herberthson integral equation dedicated to electromagnetic plane wave scattering : Analyse mathématique et numérique de l’équation intégrale de Herberthson dédié à la diffraction d’ondes planes.

Degree: Docteur es, Mathematiques appliquees et calcul scientifique, 2017, Bordeaux

URL: http://www.theses.fr/2017BORD0578

►

Cette thèse porte sur la diffraction d’une onde plane électromagnétique par une surface lisse parfaitement conductrice (PEC). Elle présente l’analyse des propriétés d’une nouvelle formulation… (more)

▼

Cette thèse porte sur la diffraction d’une onde plane électromagnétique par une surface lisse parfaitement conductrice (PEC). Elle présente l’analyse des propriétés d’une nouvelle formulation des trois principales équations intégrales de frontières de la théorie de la diffraction électromagnétique (EFIE, MFIE et CFIE). L’idée est d’adapter les équations intégrales conventionnelles à la diffraction d’une onde plane en supposant que la fonction de phase de l’onde plane incidente détermine la fonction de phase de la distribution de courant induit sur la surface.L’idée d’utiliser la phase dans la diffraction d’ondes planes a déjà été étudiée pour les hautes fréquences, notamment dans les thèses de Zhou (1995) et Darrigrand (2002) qui adaptèrent les espaces d’approximation des éléments finis. Dans cette thèse, cependant, nous suivons une formulation plus récente, donnée par Herberthson (2008), où la fonction de phase est incorporée dans la distribution du noyau des opérateurs intégraux.En présentant les versions modifiées de l’EFIE et de la MFIE (dénommées HEFIE et HMFIE)dans des espaces fonctionnels appropriés, nous prouvons ici l’existence d’une solution unique à cette formulation spécifique et présentons une mise en oeuvre pratique originale qui tire parti de l’expérience acquise sur l’EFIE/MFIE. Par la suite, nous explorons une propriété importante offerte par ces nouvelles formulations: la possibilité de réduire le nombre de degrés de liberté requis pour obtenir une solution précise du problème.

This thesis is about the scattering of an electromagnetic plane wave incidenton a perfectly conducting smooth surface. It presents the analysis of the properties of a newformulation of the three principal boundary integral equations of electromagnetic scattering theory(EFIE, MFIE and CFIE). The basic idea is to adapt the conventional integral equations toplane-wave scattering by supposing that the phase function of an incident plane wave determinesthe phase function of the induced boundary current distribution.This idea of using the phase in plane wave scattering has previously been studied in highfrequencyscattering, in particular in the theses by Zhou (1995) and Darrigrand (2002) whoadapt the finite element approximation spaces. In this thesis, though, we follow a more recentformulation, given by Herberthson (2008), where the phase function is incorporated in the kerneldistribution of the integral operators.Presenting the modified version of the EFIE and the MFIE (denoted HEFIE and HMFIE) inappropriate function spaces, we prove the existence of a unique solution to this specific formulationand developp an original practical implementation which takes advantage of the gainedexperience on the EFIE/MFIE. Then, we explore another important property provided by thenew formulations: the possibility to reduce the number of degrees of freedom required to get anaccurate solution of the problem.

Advisors/Committee Members: Giraud, Luc (thesis director), Poirier, Jean-René (thesis director).

Subjects/Keywords: Diffraction électromagnétique; Equation intégrale de frontières; Onde planes; Electromagnetic scattering; Boundary integral equation; Plane wave

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Alzaix, B. (2017). Mathematical and numerical analysis of the Herberthson integral equation dedicated to electromagnetic plane wave scattering : Analyse mathématique et numérique de l’équation intégrale de Herberthson dédié à la diffraction d’ondes planes. (Doctoral Dissertation). Bordeaux. Retrieved from http://www.theses.fr/2017BORD0578

Chicago Manual of Style (16^th Edition):

Alzaix, Benjamin. “Mathematical and numerical analysis of the Herberthson integral equation dedicated to electromagnetic plane wave scattering : Analyse mathématique et numérique de l’équation intégrale de Herberthson dédié à la diffraction d’ondes planes.” 2017. Doctoral Dissertation, Bordeaux. Accessed March 04, 2021. http://www.theses.fr/2017BORD0578.

MLA Handbook (7^th Edition):

Alzaix, Benjamin. “Mathematical and numerical analysis of the Herberthson integral equation dedicated to electromagnetic plane wave scattering : Analyse mathématique et numérique de l’équation intégrale de Herberthson dédié à la diffraction d’ondes planes.” 2017. Web. 04 Mar 2021.

Vancouver:

Alzaix B. Mathematical and numerical analysis of the Herberthson integral equation dedicated to electromagnetic plane wave scattering : Analyse mathématique et numérique de l’équation intégrale de Herberthson dédié à la diffraction d’ondes planes. [Internet] [Doctoral dissertation]. Bordeaux; 2017. [cited 2021 Mar 04]. Available from: http://www.theses.fr/2017BORD0578.

Council of Science Editors:

Alzaix B. Mathematical and numerical analysis of the Herberthson integral equation dedicated to electromagnetic plane wave scattering : Analyse mathématique et numérique de l’équation intégrale de Herberthson dédié à la diffraction d’ondes planes. [Doctoral Dissertation]. Bordeaux; 2017. Available from: http://www.theses.fr/2017BORD0578

University of Manchester

22. Nethercote, Matthew Allan. Effective analytic and asymptotic procedures for wave diffraction by perfect and penetrable wedges.

Degree: 2019, University of Manchester

URL: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:322242

► In this thesis, various canonical problems of plane wave diffraction by infinite two-dimensional wedges are studied in both acoustic and electromagnetic physical settings. The thesis… (more)

▼ In this thesis, various canonical problems of plane wave diffraction by infinite two-dimensional wedges are studied in both acoustic and electromagnetic physical settings. The thesis is divided into two main parts. The first, which is essentially an extensive review of extant methods, focuses on wedge diffraction with homogeneous Dirichlet or Neumann boundary conditions. It involves studying the well-known solution to Sommerfeld's half-plane diffraction problem and provides an extensive review of the literature on the perfect wedge problem, including analytic methods such as the Sommerfeld-Malyuzhinets and Wiener-Hopf techniques, as well as asymptotic techniques such as Keller's geometrical theory of diffraction. The second part of the thesis is dedicated to the problem of diffraction by a penetrable wedge. To this day, there is no clear analytical solution to this important canonical problem, but there have been numerous attempts at computational and asymptotic solutions by many reputable authors using extensions of techniques applied to perfect wedge diffraction. Because it is penetrable, the material properties between the wedge scatterer and the exterior host differ. It is hence possible to define the so-called contrast parameter as the ratio of specific material properties (depending on the physical context) between the host and the scatterer. Throughout the thesis, this parameter is considered to be small and the contrast is said to be high. This assumption allows construction of an asymptotic iterative scheme, which enables the penetrable wedge problem to be written as an infinite sequence of impenetrable wedge problems. All but the first of these impenetrable wedge problems are solved using a combination of the Sommerfeld-Malyuzhinets and Wiener-Hopf techniques. The result is a sequence of complex nested integrals which are evaluated using a subtle interplay of interpolation, asymptotic expansions and advanced complex analysis. For several test cases, including those illustrated in this thesis (that were chosen for mathematical convenience and consistency with the literature), the numerical results were in good agreement with alternative approaches. Advisors/Committee Members: ABRAHAMS, DAVID ID, Assier, Raphael, Abrahams, David.

Subjects/Keywords: Wave diffraction; Perfect (Impenetrable) wedge; Penetrable wedge; Sommerfeld-Malyuzhinets technique; Wiener-Hopf technique

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❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Nethercote, M. A. (2019). Effective analytic and asymptotic procedures for wave diffraction by perfect and penetrable wedges. (Doctoral Dissertation). University of Manchester. Retrieved from http://www.manchester.ac.uk/escholar/uk-ac-man-scw:322242

Chicago Manual of Style (16^th Edition):

Nethercote, Matthew Allan. “Effective analytic and asymptotic procedures for wave diffraction by perfect and penetrable wedges.” 2019. Doctoral Dissertation, University of Manchester. Accessed March 04, 2021. http://www.manchester.ac.uk/escholar/uk-ac-man-scw:322242.

MLA Handbook (7^th Edition):

Nethercote, Matthew Allan. “Effective analytic and asymptotic procedures for wave diffraction by perfect and penetrable wedges.” 2019. Web. 04 Mar 2021.

Vancouver:

Nethercote MA. Effective analytic and asymptotic procedures for wave diffraction by perfect and penetrable wedges. [Internet] [Doctoral dissertation]. University of Manchester; 2019. [cited 2021 Mar 04]. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:322242.

Council of Science Editors:

Nethercote MA. Effective analytic and asymptotic procedures for wave diffraction by perfect and penetrable wedges. [Doctoral Dissertation]. University of Manchester; 2019. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:322242

University of Adelaide

23. Pudipeddi, Gnana Teja. Quantitative Structural Diagnosis of Plate-like Structures using Multi-frequency Lamb Wave Diffraction Tomography.

Degree: 2019, University of Adelaide

URL: http://hdl.handle.net/2440/123403

► Quantitative identification and evaluation of damage are of utmost importance for the safety and sustainability of a structure. Identifying early stage damage is also necessary… (more)

Subjects/Keywords: Lamb wave; diffraction tomography; imaging; multifrequency; damage identification; structural health monitoring; scattering

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Pudipeddi, G. T. (2019). Quantitative Structural Diagnosis of Plate-like Structures using Multi-frequency Lamb Wave Diffraction Tomography. (Thesis). University of Adelaide. Retrieved from http://hdl.handle.net/2440/123403

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Pudipeddi, Gnana Teja. “Quantitative Structural Diagnosis of Plate-like Structures using Multi-frequency Lamb Wave Diffraction Tomography.” 2019. Thesis, University of Adelaide. Accessed March 04, 2021. http://hdl.handle.net/2440/123403.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Pudipeddi, Gnana Teja. “Quantitative Structural Diagnosis of Plate-like Structures using Multi-frequency Lamb Wave Diffraction Tomography.” 2019. Web. 04 Mar 2021.

Vancouver:

Pudipeddi GT. Quantitative Structural Diagnosis of Plate-like Structures using Multi-frequency Lamb Wave Diffraction Tomography. [Internet] [Thesis]. University of Adelaide; 2019. [cited 2021 Mar 04]. Available from: http://hdl.handle.net/2440/123403.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Pudipeddi GT. Quantitative Structural Diagnosis of Plate-like Structures using Multi-frequency Lamb Wave Diffraction Tomography. [Thesis]. University of Adelaide; 2019. Available from: http://hdl.handle.net/2440/123403

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Florida

24. Youn, Wooram. Light Extraction of Organic Light-Emitting Diodes Using Corrugated Structure.

Degree: PhD, Materials Science and Engineering, 2015, University of Florida

URL: https://ufdc.ufl.edu/UFE0047775

► Light extraction is critical to the efficiency of organic light-emitting diodes (OLEDs). Because of the internal reflection, only 20~30% of generated light in OLEDs is… (more)

Subjects/Keywords: Antinodes; Electrons; Light refraction; Periodicity; Photonics; Quantum efficiency; Sapphire; Wave diffraction; Waveguides; Wavelengths; extraction – light

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Youn, W. (2015). Light Extraction of Organic Light-Emitting Diodes Using Corrugated Structure. (Doctoral Dissertation). University of Florida. Retrieved from https://ufdc.ufl.edu/UFE0047775

Chicago Manual of Style (16^th Edition):

Youn, Wooram. “Light Extraction of Organic Light-Emitting Diodes Using Corrugated Structure.” 2015. Doctoral Dissertation, University of Florida. Accessed March 04, 2021. https://ufdc.ufl.edu/UFE0047775.

MLA Handbook (7^th Edition):

Youn, Wooram. “Light Extraction of Organic Light-Emitting Diodes Using Corrugated Structure.” 2015. Web. 04 Mar 2021.

Vancouver:

Youn W. Light Extraction of Organic Light-Emitting Diodes Using Corrugated Structure. [Internet] [Doctoral dissertation]. University of Florida; 2015. [cited 2021 Mar 04]. Available from: https://ufdc.ufl.edu/UFE0047775.

Council of Science Editors:

Youn W. Light Extraction of Organic Light-Emitting Diodes Using Corrugated Structure. [Doctoral Dissertation]. University of Florida; 2015. Available from: https://ufdc.ufl.edu/UFE0047775

University of Arizona

25. Gish Allouche, Genevieve. Implementation and Verification of RCWA Model .

Degree: 2018, University of Arizona

URL: http://hdl.handle.net/10150/630137

► An RCWA Matlab simulation was developed to guide future designs of phase plates for VCSELs. We will discuss the verification process to validate our current… (more)

Subjects/Keywords: diffraction theory; non-paraxial scalar theory; RCWA; rigorous coupled wave analysis; verification

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Gish Allouche, G. (2018). Implementation and Verification of RCWA Model . (Masters Thesis). University of Arizona. Retrieved from http://hdl.handle.net/10150/630137

Chicago Manual of Style (16^th Edition):

Gish Allouche, Genevieve. “Implementation and Verification of RCWA Model .” 2018. Masters Thesis, University of Arizona. Accessed March 04, 2021. http://hdl.handle.net/10150/630137.

MLA Handbook (7^th Edition):

Gish Allouche, Genevieve. “Implementation and Verification of RCWA Model .” 2018. Web. 04 Mar 2021.

Vancouver:

Gish Allouche G. Implementation and Verification of RCWA Model . [Internet] [Masters thesis]. University of Arizona; 2018. [cited 2021 Mar 04]. Available from: http://hdl.handle.net/10150/630137.

Council of Science Editors:

Gish Allouche G. Implementation and Verification of RCWA Model . [Masters Thesis]. University of Arizona; 2018. Available from: http://hdl.handle.net/10150/630137

26. Meng, Bo. Calculation of Extreme Wave Loads on Coastal Highway Bridges.

Degree: PhD, Ocean Engineering, 2010, Texas A&M University

URL: http://hdl.handle.net/1969.1/ETD-TAMU-2008-12-254

► Coastal bridges are exposed to severe wave, current and wind forces during a hurricane. Most coastal bridges are not designed to resist wave loads in… (more)

Subjects/Keywords: wave loads; bridge; diffraction; flow3d

…The wave potential diffraction theory is capable of filling the gap in which there are no… …x28;1962) used a theoretical approach to study wave diffraction around a single breakwater… …1971, Cheong et al. 1996) are also used to solve wave diffraction and refraction… …viii CHAPTER Page Wave Periods… …102 5.7.4 Estimation Equations According to Wave Heights and Wave Period…

10 more images…

Record Details Similar Records Cite « Share

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Meng, B. (2010). Calculation of Extreme Wave Loads on Coastal Highway Bridges. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2008-12-254

Chicago Manual of Style (16^th Edition):

Meng, Bo. “Calculation of Extreme Wave Loads on Coastal Highway Bridges.” 2010. Doctoral Dissertation, Texas A&M University. Accessed March 04, 2021. http://hdl.handle.net/1969.1/ETD-TAMU-2008-12-254.

MLA Handbook (7^th Edition):

Meng, Bo. “Calculation of Extreme Wave Loads on Coastal Highway Bridges.” 2010. Web. 04 Mar 2021.

Vancouver:

Meng B. Calculation of Extreme Wave Loads on Coastal Highway Bridges. [Internet] [Doctoral dissertation]. Texas A&M University; 2010. [cited 2021 Mar 04]. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2008-12-254.

Council of Science Editors:

Meng B. Calculation of Extreme Wave Loads on Coastal Highway Bridges. [Doctoral Dissertation]. Texas A&M University; 2010. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2008-12-254

University of Manchester

27. Nethercote, Matthew. Effective analytic and asymptotic procedures for wave diffraction by perfect and penetrable wedges.

Degree: PhD, 2019, University of Manchester

URL: https://www.research.manchester.ac.uk/portal/en/theses/effective-analytic-and-asymptotic-procedures-for-wave-diffraction-by-perfect-and-penetrable-wedges(0158dced-e22b-4029-ab5e-fb5a053299d3).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.791232

► In this thesis, various canonical problems of plane wave diffraction by infinite two-dimensional wedges are studied in both acoustic and electromagnetic physical settings. The thesis… (more)

▼ In this thesis, various canonical problems of plane wave diffraction by infinite two-dimensional wedges are studied in both acoustic and electromagnetic physical settings. The thesis is divided into two main parts. The first, which is essentially an extensive review of extant methods, focuses on wedge diffraction with homogeneous Dirichlet or Neumann boundary conditions. It involves studying the well-known solution to Sommerfeld's half-plane diffraction problem and provides an extensive review of the literature on the perfect wedge problem, including analytic methods such as the Sommerfeld-Malyuzhinets and Wiener-Hopf techniques, as well as asymptotic techniques such as Keller's geometrical theory of diffraction. The second part of the thesis is dedicated to the problem of diffraction by a penetrable wedge. To this day, there is no clear analytical solution to this important canonical problem, but there have been numerous attempts at computational and asymptotic solutions by many reputable authors using extensions of techniques applied to perfect wedge diffraction. Because it is penetrable, the material properties between the wedge scatterer and the exterior host differ. It is hence possible to define the so-called contrast parameter as the ratio of specific material properties (depending on the physical context) between the host and the scatterer. Throughout the thesis, this parameter is considered to be small and the contrast is said to be high. This assumption allows construction of an asymptotic iterative scheme, which enables the penetrable wedge problem to be written as an infinite sequence of impenetrable wedge problems. All but the first of these impenetrable wedge problems are solved using a combination of the Sommerfeld-Malyuzhinets and Wiener-Hopf techniques. The result is a sequence of complex nested integrals which are evaluated using a subtle interplay of interpolation, asymptotic expansions and advanced complex analysis. For several test cases, including those illustrated in this thesis (that were chosen for mathematical convenience and consistency with the literature), the numerical results were in good agreement with alternative approaches.

Subjects/Keywords: 510; Wave diffraction; Penetrable wedge; Sommerfeld-Malyuzhinets technique; Wiener-Hopf technique; Perfect (Impenetrable) wedge

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Nethercote, M. (2019). Effective analytic and asymptotic procedures for wave diffraction by perfect and penetrable wedges. (Doctoral Dissertation). University of Manchester. Retrieved from https://www.research.manchester.ac.uk/portal/en/theses/effective-analytic-and-asymptotic-procedures-for-wave-diffraction-by-perfect-and-penetrable-wedges(0158dced-e22b-4029-ab5e-fb5a053299d3).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.791232

Chicago Manual of Style (16^th Edition):

Nethercote, Matthew. “Effective analytic and asymptotic procedures for wave diffraction by perfect and penetrable wedges.” 2019. Doctoral Dissertation, University of Manchester. Accessed March 04, 2021. https://www.research.manchester.ac.uk/portal/en/theses/effective-analytic-and-asymptotic-procedures-for-wave-diffraction-by-perfect-and-penetrable-wedges(0158dced-e22b-4029-ab5e-fb5a053299d3).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.791232.

MLA Handbook (7^th Edition):

Nethercote, Matthew. “Effective analytic and asymptotic procedures for wave diffraction by perfect and penetrable wedges.” 2019. Web. 04 Mar 2021.

Vancouver:

Nethercote M. Effective analytic and asymptotic procedures for wave diffraction by perfect and penetrable wedges. [Internet] [Doctoral dissertation]. University of Manchester; 2019. [cited 2021 Mar 04]. Available from: https://www.research.manchester.ac.uk/portal/en/theses/effective-analytic-and-asymptotic-procedures-for-wave-diffraction-by-perfect-and-penetrable-wedges(0158dced-e22b-4029-ab5e-fb5a053299d3).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.791232.

Council of Science Editors:

Nethercote M. Effective analytic and asymptotic procedures for wave diffraction by perfect and penetrable wedges. [Doctoral Dissertation]. University of Manchester; 2019. Available from: https://www.research.manchester.ac.uk/portal/en/theses/effective-analytic-and-asymptotic-procedures-for-wave-diffraction-by-perfect-and-penetrable-wedges(0158dced-e22b-4029-ab5e-fb5a053299d3).html ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.791232

Michigan State University

28. Zhou, Faran. Non-equilibrium phase transformations in charge-density wave and strongly correlated systems studied by coherent femtosecond electron diffraction.

Degree: 2019, Michigan State University

URL: http://etd.lib.msu.edu/islandora/object/etd:48270

►

Thesis Ph. D. Michigan State University. Physics 2019.

"By photo-exciting electrons in a material causing subsequent electron-electron and electron-phonon interactions, an energy landscape is created… (more)

▼

Thesis Ph. D. Michigan State University. Physics 2019.

"By photo-exciting electrons in a material causing subsequent electron-electron and electron-phonon interactions, an energy landscape is created that is very different from that in thermal equilibrium. This distinction sets the baseline that photo-induced phase transitions (PIPT) could go through very different pathways compared with the thermally-induced phase transitions in equilibrium. This opens up a new dimension for complex materials research in non-equilibrium with ultrafast tools. In recent years, with the discovery of photo-induced superconductivity (SC) and other hidden quantum states, the study of these metastable and hidden phases in quantum materials has drawn intense interest in the ultrafast community.With femtosecond electron diffraction, we have observed intriguing phenomena in a few charge-density wave (CDW) materials (CeTe3, ErTe3 and 1T-TaS2) and iron chalcogenide systems (FeTe, FeSe0.44Te0.56 and FeSe). We explore the metastable hidden phases and observe universal dynamics in these materials far from equilibrium.CeTe3 exhibits uni-directional stripe CDW order in thermal equilibrium. Bi-directional CDW is thermodynamically forbidden. After femtosecond laser pulse excitation, the system is driven to a bi-directional order as it crosses a nonthermal fixed point. The new state is formed through associated symmetry changes that cause softening/hardening of CDW-related phonons. The CDW wavevector change proves that Fermi surface nesting (FSN)-enhanced electron-phonon coupling plays a central role in driving the CDW instabilities. Based on these results, we propose a nonthermal phase transition pathway in the non-equilibrium phase diagram.The work in ErTe3 is one step further based on the CeTe3 results. ErTe3 is on the opposite side of the rare-earth tritelluride (RETe3) series to host two orthogonal CDW orders at low temperature. Together with CeTe3 data, the ultrafast results at various temperatures in ErTe3 indicate that the system becomes more symmetric after laser excitation. Given the robustness of the data, the conclusion here may be extended to similar systems as well.The generic features of CDW dynamics in 1T-TaS2 are very similar to those in the quench dynamics of isolated quantum systems (e.g. cold atoms). After laser excitation, the system goes to the prethermalization plateau region before the thermalization stage. We find that both regimes follow universal scalings due to the existence of two nonthermal fixed points. Microscopically, we propose a chiral-symmetry-breaking mechanism that mediates the phase transformation. With a 2500 nm excitation laser, we emphasize the photo-doping, instead of the photo-thermal effect, in driving the phase transition. Due to the lack of thermal energy, the phase transition induced by the 2500 nm laser is more first order-like with faster switching speeds than 800 nm excitation. This high-speed switching with little thermal energy deposition holds promise for better future optoelectronic…

Advisors/Committee Members: Ruan, Chong-Yu, Birge, Norman, Duxbury, Phillip, Pellemoine, Frederique, Zhang, Pengpeng.

Subjects/Keywords: Phase transformations (Statistical physics); Wave mechanics; Electrons – Diffraction; Femtosecond lasers; Quantum theory; Physics

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APA (6^th Edition):

Zhou, F. (2019). Non-equilibrium phase transformations in charge-density wave and strongly correlated systems studied by coherent femtosecond electron diffraction. (Thesis). Michigan State University. Retrieved from http://etd.lib.msu.edu/islandora/object/etd:48270

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Zhou, Faran. “Non-equilibrium phase transformations in charge-density wave and strongly correlated systems studied by coherent femtosecond electron diffraction.” 2019. Thesis, Michigan State University. Accessed March 04, 2021. http://etd.lib.msu.edu/islandora/object/etd:48270.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Zhou, Faran. “Non-equilibrium phase transformations in charge-density wave and strongly correlated systems studied by coherent femtosecond electron diffraction.” 2019. Web. 04 Mar 2021.

Vancouver:

Zhou F. Non-equilibrium phase transformations in charge-density wave and strongly correlated systems studied by coherent femtosecond electron diffraction. [Internet] [Thesis]. Michigan State University; 2019. [cited 2021 Mar 04]. Available from: http://etd.lib.msu.edu/islandora/object/etd:48270.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Zhou F. Non-equilibrium phase transformations in charge-density wave and strongly correlated systems studied by coherent femtosecond electron diffraction. [Thesis]. Michigan State University; 2019. Available from: http://etd.lib.msu.edu/islandora/object/etd:48270

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Delft University of Technology

29. Rivera Arreba, Irene (author). Computation of Nonlinear Wave Loads on Floating Structures.

Degree: 2017, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:684f77c9-6c3e-4951-921e-9b9f143a4202

► Floating wind turbines (FWTs) are proposed as a method to harness the significant wind energy resource in deep water. International research efforts have led to… (more)

▼ Floating wind turbines (FWTs) are proposed as a method to harness the significant wind energy resource in deep water. International research efforts have led to the development of coupled numerical global analysis tools for FWTs in order to understand their behavior under wind and wave actions. The hydrodynamic models in such tools are typically based on first-(and second-)order potential flow theory, sometimes also including Morison’s equation. In order to accurately model highly nonlinear waves, their interaction with a floating platform, and obtain estimates of the resulting loads on the structure, a numerical wave tank approach is generally needed. In this thesis, the response of floating structures to nonlinear wave loading is investigated by means of two different numerical approaches: a fully nonlinear Navier-Stokes/VOF solver and a second-order potential flow theory solver. Firstly, the fully nonlinear Navier-Stokes/VOF numerical wave tank, developed within the open-source CFD toolbox OpenFOAM, is validated against experimental data for two cases. These comprise the response of a 2D floating box and a 3D floating vertical cylinder. In order to model the motions of the floating structures, together with the generation and absorption of the waves, the interDyMFoam solver, provided by the OpenFOAM library, is extended with the waves2Foam package, developed by Jacobsen et al. (2012). Furthermore, a simple catenary mooring line is implemented for the moored cases. Secondly, a potential flow theory based model of the OC5-semisubmersible floating platform is generated. The frequency-domain analysis is done with the Wadam software and the time-domain simulations with SIMO. This model is validated against measurement data from a 1:50 scale test campaign performed at the MARIN offshore wave basin and the fully nonlinear validated CFD model. Lastly, both numerical models of the OC5-semisubmersible are compared in order to assess the suitability of the diffraction model in two different conditions where nonlinearities are of relevance. The first one involves very long waves, with periods close to 20s, which are likely to take place under swell wave conditions. These may excite the OC5-semisubmersible platform in heave at its natural frequency. The second situation deals with regular waves with increasing steepness. In principle, the fully nonlinear CFD model, if no experimental data is available, is needed to calibrate the diffraction model. However, once the latter is adjusted and validated, results are given at a much lower computational cost. According to the computations throughout this work, when dealing with waves with high steepness and high excitation frequencies, the motions, as well as the peak forces, are properly captured by the diffraction model. However, other local effects of importance for offshore structures, such as wave run-up, or the different components in frequency of the loading, require the use of a fully nonlinear CFD solver. Therefore for preliminary design stages a diffraction model is… Advisors/Committee Members: Metrikine, Andrei (mentor), Viré, Axelle (mentor), Bachynski, E.E. (mentor), Paulsen, B.T. (mentor), Bruinsma, N. (mentor), Delft University of Technology (degree granting institution), Norwegian University of Science and Technology (NTNU) (degree granting institution).

Subjects/Keywords: CFD model; diffraction model; floating structures; OpenFOAM; nonlinear wave loads; fluid-structure interaction

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APA (6^th Edition):

Rivera Arreba, I. (. (2017). Computation of Nonlinear Wave Loads on Floating Structures. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:684f77c9-6c3e-4951-921e-9b9f143a4202

Chicago Manual of Style (16^th Edition):

Rivera Arreba, Irene (author). “Computation of Nonlinear Wave Loads on Floating Structures.” 2017. Masters Thesis, Delft University of Technology. Accessed March 04, 2021. http://resolver.tudelft.nl/uuid:684f77c9-6c3e-4951-921e-9b9f143a4202.

MLA Handbook (7^th Edition):

Rivera Arreba, Irene (author). “Computation of Nonlinear Wave Loads on Floating Structures.” 2017. Web. 04 Mar 2021.

Vancouver:

Rivera Arreba I(. Computation of Nonlinear Wave Loads on Floating Structures. [Internet] [Masters thesis]. Delft University of Technology; 2017. [cited 2021 Mar 04]. Available from: http://resolver.tudelft.nl/uuid:684f77c9-6c3e-4951-921e-9b9f143a4202.

Council of Science Editors:

Rivera Arreba I(. Computation of Nonlinear Wave Loads on Floating Structures. [Masters Thesis]. Delft University of Technology; 2017. Available from: http://resolver.tudelft.nl/uuid:684f77c9-6c3e-4951-921e-9b9f143a4202

30. Yi, Jue-Min. Diffraction of single holes through planar and nanostructured metal films : Diffraction d'ouvertures sub-longueurs d'onde à travers des films métalliques réels.

Degree: Docteur es, Physique, 2013, Université de Strasbourg

URL: http://www.theses.fr/2013STRAF011

►

Le sujet de ma thèse est l’étude de la diffraction par des trous sub-longueur percés dans des films métalliques, ainsi que la compréhension du rôle… (more)

▼

Le sujet de ma thèse est l’étude de la diffraction par des trous sub-longueur percés dans des films métalliques, ainsi que la compréhension du rôle des plasmons de surface (SPs) dans la diffraction en champ lointain. Nous avons construit un goniomètre « fait maison » de haute qualité. Une série de trous unique percés dans un film opaque et variant continûment de k • r >> 1 à k • r << 1 ont été explorées. Ici, k est le vecteur d'onde de l'onde incidente et r est le rayon du trou. Les résultats expérimentaux indiquent que la diffraction de la lumière par un trou unique peut être séparée en quatre régimes, dépendant de la polarisation incidente. Une expression analytique simple révèle pour la première fois, l’implication de deux facteurs compétitifs: l'un lié aux plasmons de surface, et l'autre provenant du couplage du champ aux modes de guide d'onde de l'ouverture. Lorsque le trou est entouré par des corrugations concentriques (structure d'oeil de boeuf), et est illuminé avec les rainures sur le côté de sortie, l'effet de collimation est observé: la diffraction en champ lointain est confinée dans un très petit angle solide. L’influence des paramètres géométrique sur la figure de diffraction de l’œil de bœuf a été étudié et des motifs de diffraction dont la largeur est inférieure à 1 ° dans le champ lointain ont été atteints. Un autre mode de surface (CWs), différent des SPs, a été étudié sur des films de tungstène. Il a été démontré que les CWs permettent également d’obtenir un effet de collimation. À titre de comparaison, nous avons montré que la transmission exaltée est bien plus faible pour les CWs que pour les SPs sur nanostructures.

The theme of my thesis is to investigate the diffraction behavior of subwavelength holes in metal films, and to understand the surface plasmons’ (SPs) role in aperture far-field diffraction. We have built a home-made goniometer setup with high-level quality. A series of single hole continuously ranging from k•r>>1 to k•r<<1 in a flat opaque film were explored, where k is the wavevector of the incident wave and r is the radius of the hole. The experimental results indicated that the diffraction of single hole can be classified into four regimes, depending on the input polarization. A simple analytical expression reveals for the first time the subtle interplay of two competing factors: one related to surface plasmon excitation and the other originating in the coupling of the field to the waveguide mode of the aperture. When the hole is surrounded by concentric grooves (bull’s eye structure) and is illuminated with the grooves on the output side, the beaming effect occurs: far-field diffraction is confined in very small solid angle. The effects of geometrical parameters on bull’s eye diffraction have been studied and the diffraction patterns with the width less than 1° in the far field have been achieved. Another surface waves (CWs) different from SPs on tungsten films were studied. It was demonstrated that the CWs have beaming effect as well. By comparison we showed that CWs display…

Advisors/Committee Members: Ebbesen, Thomas W. (thesis director).

Subjects/Keywords: Diffraction; Plasmon de surface (SP); Onde de surface; Trou unique; Bull's eye; Argent; Tungstène; Diffraction; Surface plasmons (SPs); Surface wave; Single hole; Bull's eye; Silver; Bull's eye; 535.2; 620.5

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Yi, J. (2013). Diffraction of single holes through planar and nanostructured metal films : Diffraction d'ouvertures sub-longueurs d'onde à travers des films métalliques réels. (Doctoral Dissertation). Université de Strasbourg. Retrieved from http://www.theses.fr/2013STRAF011

Chicago Manual of Style (16^th Edition):

Yi, Jue-Min. “Diffraction of single holes through planar and nanostructured metal films : Diffraction d'ouvertures sub-longueurs d'onde à travers des films métalliques réels.” 2013. Doctoral Dissertation, Université de Strasbourg. Accessed March 04, 2021. http://www.theses.fr/2013STRAF011.

MLA Handbook (7^th Edition):

Yi, Jue-Min. “Diffraction of single holes through planar and nanostructured metal films : Diffraction d'ouvertures sub-longueurs d'onde à travers des films métalliques réels.” 2013. Web. 04 Mar 2021.

Vancouver:

Yi J. Diffraction of single holes through planar and nanostructured metal films : Diffraction d'ouvertures sub-longueurs d'onde à travers des films métalliques réels. [Internet] [Doctoral dissertation]. Université de Strasbourg; 2013. [cited 2021 Mar 04]. Available from: http://www.theses.fr/2013STRAF011.

Council of Science Editors:

Yi J. Diffraction of single holes through planar and nanostructured metal films : Diffraction d'ouvertures sub-longueurs d'onde à travers des films métalliques réels. [Doctoral Dissertation]. Université de Strasbourg; 2013. Available from: http://www.theses.fr/2013STRAF011

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Open Access Theses and Dissertations