subject:(Wave diffraction)

University of Manchester

1. 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 (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 October 20, 2019. 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. 20 Oct 2019.

Vancouver:

Gongora Orozco N. Experimental studies on internal shock wave phenomena and interactions. [Internet] [Doctoral dissertation]. University of Manchester; 2010. [cited 2019 Oct 20]. 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

University of Manchester

2. 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 (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 October 20, 2019. 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. 20 Oct 2019.

Vancouver:

Gongora Orozco N. Experimental studies on internal shock wave phenomena and interactions. [Internet] [Doctoral dissertation]. University of Manchester; 2010. [cited 2019 Oct 20]. 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

Delft University of Technology

3. Guzman Mardones, C.A. 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. “Impact of access channel geometry on wave penetration in harbours:.” 2011. Masters Thesis, Delft University of Technology. Accessed October 20, 2019. http://resolver.tudelft.nl/uuid:1ba13e2e-ba4e-4802-9366-92f7fc00bdfa.

MLA Handbook (7^th Edition):

Guzman Mardones, C A. “Impact of access channel geometry on wave penetration in harbours:.” 2011. Web. 20 Oct 2019.

Vancouver:

Guzman Mardones CA. Impact of access channel geometry on wave penetration in harbours:. [Internet] [Masters thesis]. Delft University of Technology; 2011. [cited 2019 Oct 20]. 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

University of Southern California

4. 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/1989

► 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/1989

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 October 20, 2019. http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll127/id/659137/rec/1989.

MLA Handbook (7^th Edition):

Amornwongpaibun, Alongkorn. “Diffraction of anti-plane (SH) waves by surface elliptical topographies in an elastic half-space.” 2011. Web. 20 Oct 2019.

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 2019 Oct 20]. Available from: http://digitallibrary.usc.edu/cdm/compoundobject/collection/p15799coll127/id/659137/rec/1989.

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/1989

The Ohio State University

5. Lertwiriyaprapa, Titipong. An approximate UTD development for the radiation by antennas near or on thin material coated metallic wedges.

Degree: PhD, Electrical Engineering, 2007, The Ohio State University

URL: http://rave.ohiolink.edu/etdc/view?acc_num=osu1196281470

► Approximate and relatively simple but closed form Uniform Geometrical Theory of Diffraction (UTD) solutions are obtained for describing the radiated, scattered and surface wave fields,… (more)

Subjects/Keywords: Uniform Geometrical Theory of Diffraction; UTD; diffraction; slope diffraction; wedge; material coated metallic; backward surface wave; double negative material

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APA (6^th Edition):

Lertwiriyaprapa, T. (2007). An approximate UTD development for the radiation by antennas near or on thin material coated metallic wedges. (Doctoral Dissertation). The Ohio State University. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=osu1196281470

Chicago Manual of Style (16^th Edition):

Lertwiriyaprapa, Titipong. “An approximate UTD development for the radiation by antennas near or on thin material coated metallic wedges.” 2007. Doctoral Dissertation, The Ohio State University. Accessed October 20, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1196281470.

MLA Handbook (7^th Edition):

Lertwiriyaprapa, Titipong. “An approximate UTD development for the radiation by antennas near or on thin material coated metallic wedges.” 2007. Web. 20 Oct 2019.

Vancouver:

Lertwiriyaprapa T. An approximate UTD development for the radiation by antennas near or on thin material coated metallic wedges. [Internet] [Doctoral dissertation]. The Ohio State University; 2007. [cited 2019 Oct 20]. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1196281470.

Council of Science Editors:

Lertwiriyaprapa T. An approximate UTD development for the radiation by antennas near or on thin material coated metallic wedges. [Doctoral Dissertation]. The Ohio State University; 2007. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=osu1196281470

Virginia Tech

6. 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 October 20, 2019. http://hdl.handle.net/10919/50423.

MLA Handbook (7^th Edition):

Xue, Jing. “Wavefront Healing and Tomographic Resolution of Mantle Plumes.” 2014. Web. 20 Oct 2019.

Vancouver:

Xue J. Wavefront Healing and Tomographic Resolution of Mantle Plumes. [Internet] [Masters thesis]. Virginia Tech; 2014. [cited 2019 Oct 20]. 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

The Ohio State University

7. 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 October 20, 2019. 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. 20 Oct 2019.

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 2019 Oct 20]. 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

8. 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 October 20, 2019. 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. 20 Oct 2019.

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 2019 Oct 20]. 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

University of Alberta

9. 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 October 20, 2019. 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. 20 Oct 2019.

Vancouver:

Subramanian VR. Fabrication of Bragg gratings in silicon-on-insulator waveguides. [Internet] [Masters thesis]. University of Alberta; 2002. [cited 2019 Oct 20]. 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

Delft University of Technology

10. Doorn, N. 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)

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. “Diffraction in a spectral wave model:.” 1997. Masters Thesis, Delft University of Technology. Accessed October 20, 2019. http://resolver.tudelft.nl/uuid:995f7333-a19a-4c33-97eb-99624c101238.

MLA Handbook (7^th Edition):

Doorn, N. “Diffraction in a spectral wave model:.” 1997. Web. 20 Oct 2019.

Vancouver:

Doorn N. Diffraction in a spectral wave model:. [Internet] [Masters thesis]. Delft University of Technology; 1997. [cited 2019 Oct 20]. 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

Delft University of Technology

11. De Lange, P.H.M. 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. “Golfdoordringing in een haven:.” 1992. Masters Thesis, Delft University of Technology. Accessed October 20, 2019. http://resolver.tudelft.nl/uuid:41601bba-3421-48b4-9b63-5b60f47f719c.

MLA Handbook (7^th Edition):

De Lange, P H M. “Golfdoordringing in een haven:.” 1992. Web. 20 Oct 2019.

Vancouver:

De Lange PHM. Golfdoordringing in een haven:. [Internet] [Masters thesis]. Delft University of Technology; 1992. [cited 2019 Oct 20]. 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

University of Arizona

12. 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 October 20, 2019. http://hdl.handle.net/10150/289321.

MLA Handbook (7^th Edition):

Quintenz, Jeffrey Paul, 1949-. “SLOTS IN A PARALLEL PLATE WAVEGUIDE .” 1975. Web. 20 Oct 2019.

Vancouver:

Quintenz, Jeffrey Paul 1. SLOTS IN A PARALLEL PLATE WAVEGUIDE . [Internet] [Doctoral dissertation]. University of Arizona; 1975. [cited 2019 Oct 20]. 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

13. 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 October 20, 2019. http://hdl.handle.net/10150/184914.

MLA Handbook (7^th Edition):

Ehrlich, Jeffrey Ellis. “Nonlinear grating structures in indium antimonide waveguides. ” 1989. Web. 20 Oct 2019.

Vancouver:

Ehrlich JE. Nonlinear grating structures in indium antimonide waveguides. [Internet] [Doctoral dissertation]. University of Arizona; 1989. [cited 2019 Oct 20]. 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

14. 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 October 20, 2019. http://hdl.handle.net/2152/32553.

MLA Handbook (7^th Edition):

Decker, Luke Adam. “Seismic diffraction imaging methods and applications.” 2014. Web. 20 Oct 2019.

Vancouver:

Decker LA. Seismic diffraction imaging methods and applications. [Internet] [Masters thesis]. University of Texas – Austin; 2014. [cited 2019 Oct 20]. 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

Michigan State University

15. 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 October 20, 2019. 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. 20 Oct 2019.

Vancouver:

Watson CM. Demonstration of Fresnel interference by means of a ripple tank. [Internet] [Masters thesis]. Michigan State University; 1958. [cited 2019 Oct 20]. 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

Georgia Tech

16. Pirkl, Ryan J. Measurement-based investigations of radio wave propagation: an exposé on building corner diffraction.

Degree: PhD, Electrical and Computer Engineering, 2010, Georgia Tech

URL: http://hdl.handle.net/1853/33961

► Predicting performance metrics for the next-generation of multi-mode and multi-antenna wireless communication systems demands site-specific knowledge of the wireless channel's underlying radio wave propagation mechanisms.… (more)

▼ Predicting performance metrics for the next-generation of multi-mode and multi-antenna wireless communication systems demands site-specific knowledge of the wireless channel's underlying radio wave propagation mechanisms. This thesis describes the first measurement system capable of characterizing individual propagation mechanisms in situ. The measurement system merges a high-resolution spatio-temporal wireless channel sounder with a new field reconstruction technique to provide complete knowledge of the wireless channel's impulse response throughout a 2-dimensional region. This wealth of data may be combined with space-time filtering techniques to isolate and characterize individual propagation mechanisms. The utility of the spatio-temporal measurement system is demonstrated through a measurement-based investigation of diffraction around building corners. These measurements are combined with space-time filtering techniques and a new linear wedge diffraction model to extract the first semi-mpirical diffraction coefficient. Specific contributions of this thesis are: * The first ultra-wideband single-input multiple-output (SIMO) channel sounder based upon the sliding correlator architecture. * A quasi 2-dimensional field reconstruction technique based upon a conjoint cylindrical wave expansion of coherent perimeter measurements. * A wireless channel ``filming' technique that records the time-domain evolution of the wireless channel throughout a 2-dimensional region. * High-resolution measurements of the space-time wireless channel near a right-angled brick building corner. * The application of space-time filtering techniques to isolate the edge diffraction problem from the overall wireless channel. * An approximate uniform geometrical theory of diffraction (UTD)-style linear model describing diffraction by an impedance wedge. * The first-ever semi-empirical diffraction coefficient extracted from in situ measurement data. This thesis paves the way for several new avenues of research. The comprehensive measurement data provided by channel "filming" will enable researchers to develop and implement powerful space-time filtering techniques that facilitate measurement-based investigations of radio wave propagation. The measurement procedure described in this thesis may be adapted to extract realistic reflection and rough-surface scattering coefficients. Finally, exhaustive measurements of individual propagation mechanisms will enable the first semi-empirical propagation model that integrates empirical descriptions of propagation mechanisms into a UTD-style mechanistic framework. Advisors/Committee Members: Durgin, Gregory D. (Committee Chair), Peterson, Andrew F. (Committee Member), Remley, Kate A. (Committee Member), Smith, Glenn S. (Committee Member), Steffes, Paul G. (Committee Member).

Subjects/Keywords: Electromagnetics; Wireless channel; Diffraction; Radio wave propagation; Antenna radiation patterns; Diffraction; Wireless communication systems Mathematical models

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APA (6^th Edition):

Pirkl, R. J. (2010). Measurement-based investigations of radio wave propagation: an exposé on building corner diffraction. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/33961

Chicago Manual of Style (16^th Edition):

Pirkl, Ryan J. “Measurement-based investigations of radio wave propagation: an exposé on building corner diffraction.” 2010. Doctoral Dissertation, Georgia Tech. Accessed October 20, 2019. http://hdl.handle.net/1853/33961.

MLA Handbook (7^th Edition):

Pirkl, Ryan J. “Measurement-based investigations of radio wave propagation: an exposé on building corner diffraction.” 2010. Web. 20 Oct 2019.

Vancouver:

Pirkl RJ. Measurement-based investigations of radio wave propagation: an exposé on building corner diffraction. [Internet] [Doctoral dissertation]. Georgia Tech; 2010. [cited 2019 Oct 20]. Available from: http://hdl.handle.net/1853/33961.

Council of Science Editors:

Pirkl RJ. Measurement-based investigations of radio wave propagation: an exposé on building corner diffraction. [Doctoral Dissertation]. Georgia Tech; 2010. Available from: http://hdl.handle.net/1853/33961

Montana State University

17. Struckhoff, Andrew David. Fresnel diffraction with small apertures.

Degree: College of Letters & Science, 1991, Montana State University

URL: https://scholarworks.montana.edu/xmlui/handle/1/7144

Subjects/Keywords: Diffraction.; Electromagnetic waves Diffraction.; Wave theory of light

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APA (6^th Edition):

Struckhoff, A. D. (1991). Fresnel diffraction with small apertures. (Thesis). Montana State University. Retrieved from https://scholarworks.montana.edu/xmlui/handle/1/7144

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):

Struckhoff, Andrew David. “Fresnel diffraction with small apertures.” 1991. Thesis, Montana State University. Accessed October 20, 2019. https://scholarworks.montana.edu/xmlui/handle/1/7144.

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

MLA Handbook (7^th Edition):

Struckhoff, Andrew David. “Fresnel diffraction with small apertures.” 1991. Web. 20 Oct 2019.

Vancouver:

Struckhoff AD. Fresnel diffraction with small apertures. [Internet] [Thesis]. Montana State University; 1991. [cited 2019 Oct 20]. Available from: https://scholarworks.montana.edu/xmlui/handle/1/7144.

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

Council of Science Editors:

Struckhoff AD. Fresnel diffraction with small apertures. [Thesis]. Montana State University; 1991. Available from: https://scholarworks.montana.edu/xmlui/handle/1/7144

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

University of Florida

18. Jang, Jung. Observation of Defects Evolution in Electronic Materials.

Degree: PhD, Materials Science and Engineering, 2009, University of Florida

URL: http://ufdc.ufl.edu/UFE0024741

► Advanced characterization techniques have been used to obtain a better understanding of the microstructure of electronic materials. The structural evolution, especially defects, has been investigated… (more)

▼ Advanced characterization techniques have been used to obtain a better understanding of the microstructure of electronic materials. The structural evolution, especially defects, has been investigated during the film growth and post-growth processes. Obtaining the relation between the defect evolution and growth/post-growth parameters is very important to obtain highly crystalline films. In this work, the growth and post-growth related defects in GaN, ZnO, strained-Si/SiGe films have been studied using several advanced characterization techniques. First of all, the growth of related defects in GaN and p-type ZnO films have been studied. The effect of growth parameters, such as growth temperature, gas flow rate, dopants used during the deposition, on the crystalline quality of the GaN and ZnO layers was investigated by high resolution X-ray diffraction (HRXRD) and transmission electron microscopy (TEM). In GaN films, it was found that the edge and mixed type threading dislocations were the dominant defects so that the only relevant figure of merit (FOM) for the crystalline quality should be the FWHM value of ?-RC of the surface perpendicular plane which could be determined by a grazing incidence x-ray diffraction (GIXD) technique as shown in this work. The understanding of the relationship between the defect evolution and growth parameters allowed for the growth of high crystalline GaN films. For ZnO films, it was found that the degree of texture and crystalline quality of P-doped ZnO films decreased with increasing the phosphorus atomic percent. In addition, the result from the x-ray diffraction line profile analysis showed that the 0.5 at % P-doped ZnO film showed much higher miscrostrain than the 1.0 at % P-doped ZnO film, which indicated that the phosphorus atoms were segregated with increasing P atomic percentage. Finally, post-growth related defects in strained-Si/SiGe films were investigated. Post-growth processes used in this work included high temperature N2 annealing, ion-implantation, and thermal oxidation. Advanced characterization techniques have been used to obtain information about strain, relaxation, layer thickness, elemental composition, defects, surface/interface morphology changes and so on. Based on the understanding of defects behavior during the strain relaxation after post thermal processes, a new manufacturing process to obtain highly-relaxed and thin Si1-xGex layers, which could be used as virtual substrates for strained-Si applications, was found. ( en ) Advisors/Committee Members: Craciun, Valentin (committee chair), Singh, Rajiv K. (committee member), Pearton, Stephen J. (committee member), Abernathy, Cammy R. (committee member), Anderson, Timothy J. (committee member).

Subjects/Keywords: Annealing; Electrons; Geometric angles; Geometric planes; High temperature; Nucleation; Oxidation; Silicon; Solar X rays; Wave diffraction; diffraction, film, microstructure, thin

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APA (6^th Edition):

Jang, J. (2009). Observation of Defects Evolution in Electronic Materials. (Doctoral Dissertation). University of Florida. Retrieved from http://ufdc.ufl.edu/UFE0024741

Chicago Manual of Style (16^th Edition):

Jang, Jung. “Observation of Defects Evolution in Electronic Materials.” 2009. Doctoral Dissertation, University of Florida. Accessed October 20, 2019. http://ufdc.ufl.edu/UFE0024741.

MLA Handbook (7^th Edition):

Jang, Jung. “Observation of Defects Evolution in Electronic Materials.” 2009. Web. 20 Oct 2019.

Vancouver:

Jang J. Observation of Defects Evolution in Electronic Materials. [Internet] [Doctoral dissertation]. University of Florida; 2009. [cited 2019 Oct 20]. Available from: http://ufdc.ufl.edu/UFE0024741.

Council of Science Editors:

Jang J. Observation of Defects Evolution in Electronic Materials. [Doctoral Dissertation]. University of Florida; 2009. Available from: http://ufdc.ufl.edu/UFE0024741

University of Florida

19. Nittala, Krishna. In Situ X-Ray Diffraction Based Investigation of Crystallization in Solution Deposited PZT Thin Films.

Degree: PhD, Materials Science and Engineering, 2012, University of Florida

URL: http://ufdc.ufl.edu/UFE0044015

► Solution deposited PZT based thin films have potential applications in embedded decoupling capacitors and pulse discharge capacitors. During solution deposition, precursor solution is deposited onto… (more)

▼ Solution deposited PZT based thin films have potential applications in embedded decoupling capacitors and pulse discharge capacitors. During solution deposition, precursor solution is deposited onto a substrate to obtain an amorphous film. The film is then crystallized by heating it at a high temperature (~600 - 700°C). Conditions during the crystallization anneal such as precursor stoichiometry in solution, heating rate and adhesion layer in the substrate are known to influence phase and texture evolution in these films. However, a mechanistic understanding of the changes taking place in these thin films during crystallization is lacking. A better understanding of the crystallization processes in these thin films could enable tailoring the properties of thin films to suit specific applications. To explore the crystallization process in solution deposited PZT thin films, high temperature in situ laboratory and synchrotron X-ray diffraction based techniques were developed. Taking advantage of the high X-ray flux available at synchrotron facilities such as beamline 6-ID-B, Advanced Photon Source, Argonne National Laboratory, crystalline phases formed in the thin films during crystallization at the high heating rates (0.5 – 60°C/s)typically used during film processing could be measured. Using a 2-D detector for these measurements allowed the simultaneous measurement of both phase and texture information during crystallization. Analytical treatment of the unconventional diffraction geometry used during the synchrotron based measurements was performed to develop methodologies for quantitative estimation of texture components. The nominal lead content in the starting solutions and the heating rate used during crystallization was observed to influence the sequence of phases formed during crystallization of the films. In films crystallized at fast heating rates,titanium segregation, probably due to diffusion of titanium from the adhesion layer, was observed. To further investigate the effect of adhesion layer on the crystallization behavior of these films, PZT films were solution deposited onto substrates with titanium (Ti), titanium oxide (TiOx) and zinc oxide (ZnO) adhesion layers. Phase evolution was observed to be unaffected by the adhesion layer. (111) oriented PZT films were obtained on all substrates and hence Ti diffusion from the adhesion layer appeared to have limited influence on texture control in these films. It is suggested that the (111) orientation of the perovskite phase is directly seeded by the Pt(111) texture. ( en ) Advisors/Committee Members: Jones, Jacob L. (committee chair), Phillpot, Simon R (committee member), Craciun, Valentin (committee member), Perry, Scott S. (committee member), Biswas, Amlan (committee member).

Subjects/Keywords: Adhesion; Crystallization; Fluorite; Heating; Lattice parameters; Perovskites; Solar X rays; Thin films; Titanium; Wave diffraction; diffraction – films – pzt – thin

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APA (6^th Edition):

Nittala, K. (2012). In Situ X-Ray Diffraction Based Investigation of Crystallization in Solution Deposited PZT Thin Films. (Doctoral Dissertation). University of Florida. Retrieved from http://ufdc.ufl.edu/UFE0044015

Chicago Manual of Style (16^th Edition):

Nittala, Krishna. “In Situ X-Ray Diffraction Based Investigation of Crystallization in Solution Deposited PZT Thin Films.” 2012. Doctoral Dissertation, University of Florida. Accessed October 20, 2019. http://ufdc.ufl.edu/UFE0044015.

MLA Handbook (7^th Edition):

Nittala, Krishna. “In Situ X-Ray Diffraction Based Investigation of Crystallization in Solution Deposited PZT Thin Films.” 2012. Web. 20 Oct 2019.

Vancouver:

Nittala K. In Situ X-Ray Diffraction Based Investigation of Crystallization in Solution Deposited PZT Thin Films. [Internet] [Doctoral dissertation]. University of Florida; 2012. [cited 2019 Oct 20]. Available from: http://ufdc.ufl.edu/UFE0044015.

Council of Science Editors:

Nittala K. In Situ X-Ray Diffraction Based Investigation of Crystallization in Solution Deposited PZT Thin Films. [Doctoral Dissertation]. University of Florida; 2012. Available from: http://ufdc.ufl.edu/UFE0044015

University of Florida

20. Fischer, Jason. High-Yield Size-Tunable Synthesis of Submicron Gold Particles.

Degree: 2012, University of Florida

URL: http://ufdc.ufl.edu/AA00059511

► Current technologies for gene transfer to chloroplast uses 600 nm gold particles. It has been hypothesized that smaller gold particles (100-500 nm) more appropriately sized… (more)

Subjects/Keywords: Aqueous solutions; Chlorides; Chloroplasts; Electron microscopes; Image analysis; Lasers; Particle diffraction; Polymers; Technology transfer; Wave diffraction; Genetic transformation; Gold; Nanoparticles

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APA (6^th Edition):

Fischer, J. (2012). High-Yield Size-Tunable Synthesis of Submicron Gold Particles. (Thesis). University of Florida. Retrieved from http://ufdc.ufl.edu/AA00059511

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):

Fischer, Jason. “High-Yield Size-Tunable Synthesis of Submicron Gold Particles.” 2012. Thesis, University of Florida. Accessed October 20, 2019. http://ufdc.ufl.edu/AA00059511.

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

MLA Handbook (7^th Edition):

Fischer, Jason. “High-Yield Size-Tunable Synthesis of Submicron Gold Particles.” 2012. Web. 20 Oct 2019.

Vancouver:

Fischer J. High-Yield Size-Tunable Synthesis of Submicron Gold Particles. [Internet] [Thesis]. University of Florida; 2012. [cited 2019 Oct 20]. Available from: http://ufdc.ufl.edu/AA00059511.

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

Council of Science Editors:

Fischer J. High-Yield Size-Tunable Synthesis of Submicron Gold Particles. [Thesis]. University of Florida; 2012. Available from: http://ufdc.ufl.edu/AA00059511

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

University of Canterbury

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

Degree: Geography, 2015, University of Canterbury

URL: http://hdl.handle.net/10092/10478

► 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. (Thesis). University of Canterbury. Retrieved from http://hdl.handle.net/10092/10478

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):

Eisazadeh Moghaddam, Arash. “Pocket beach wave processes and current systems investigated via field and numerical modelling studies: A case study of Okains Bay.” 2015. Thesis, University of Canterbury. Accessed October 20, 2019. http://hdl.handle.net/10092/10478.

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

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. 20 Oct 2019.

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] [Thesis]. University of Canterbury; 2015. [cited 2019 Oct 20]. Available from: http://hdl.handle.net/10092/10478.

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

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. [Thesis]. University of Canterbury; 2015. Available from: http://hdl.handle.net/10092/10478

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

UCLA

22. 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 October 20, 2019. 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. 20 Oct 2019.

Vancouver:

Li X. New resonances, gratings, and slow-wave structures based on 2D periodic structures. [Internet] [Thesis]. UCLA; 2018. [cited 2019 Oct 20]. 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

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

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 October 20, 2019. 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. 20 Oct 2019.

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 2019 Oct 20]. 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

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

Degree: 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…

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APA (6^th Edition):

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

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):

Meng, Bo. “Calculation of Extreme Wave Loads on Coastal Highway Bridges.” 2010. Thesis, Texas A&M University. Accessed October 20, 2019. http://hdl.handle.net/1969.1/ETD-TAMU-2008-12-254.

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

MLA Handbook (7^th Edition):

Meng, Bo. “Calculation of Extreme Wave Loads on Coastal Highway Bridges.” 2010. Web. 20 Oct 2019.

Vancouver:

Meng B. Calculation of Extreme Wave Loads on Coastal Highway Bridges. [Internet] [Thesis]. Texas A&M University; 2010. [cited 2019 Oct 20]. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2008-12-254.

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

Council of Science Editors:

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

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

NSYSU

25. 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 October 20, 2019. 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. 20 Oct 2019.

Vancouver:

Chen C. Pressure and doping effects on the anomalous phase transition in ternary superconductor Bi2Rh3Se2. [Internet] [Thesis]. NSYSU; 2012. [cited 2019 Oct 20]. 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

University of Florida

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

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

URL: http://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 http://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 October 20, 2019. http://ufdc.ufl.edu/UFE0047775.

MLA Handbook (7^th Edition):

Youn, Wooram. “Light Extraction of Organic Light-Emitting Diodes Using Corrugated Structure.” 2015. Web. 20 Oct 2019.

Vancouver:

Youn W. Light Extraction of Organic Light-Emitting Diodes Using Corrugated Structure. [Internet] [Doctoral dissertation]. University of Florida; 2015. [cited 2019 Oct 20]. Available from: http://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: http://ufdc.ufl.edu/UFE0047775

27. 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 October 20, 2019. 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. 20 Oct 2019.

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 2019 Oct 20]. 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 Arizona

28. 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 October 20, 2019. http://hdl.handle.net/10150/630137.

MLA Handbook (7^th Edition):

Gish Allouche, Genevieve. “Implementation and Verification of RCWA Model .” 2018. Web. 20 Oct 2019.

Vancouver:

Gish Allouche G. Implementation and Verification of RCWA Model . [Internet] [Masters thesis]. University of Arizona; 2018. [cited 2019 Oct 20]. 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

University of Florida

29. Seshadri, Shruti B. Investigation of Piezoelectric Softening Mechanisms in Lead Zirconate Titanate Using Diffraction and Property Measurements.

Degree: PhD, Materials Science and Engineering, 2012, University of Florida

URL: http://ufdc.ufl.edu/UFE0045009

► Lead zirconate titanate (PZT) is a well-known piezoelectric ceramic of commercial and scientific importance. Typically, PZT is used in its doped form as doping allows… (more)

▼ Lead zirconate titanate (PZT) is a well-known piezoelectric ceramic of commercial and scientific importance. Typically, PZT is used in its doped form as doping allows its properties to be tailored for specific applications. Donor doping turns PZT into a "soft" ferroelectric.One of the characteristics of soft ferroelectrics is an increase in their longitudinal piezoelectric coefficient. Softening is currently attributed to an increase in the concentration of lead vacancies and the associated effect on the behavior of ferroelectric domain walls. However, the exact mechanism by which donor doping enhances the longitudinal piezoelectric coefficient is still not understood. In this work, the crystallographic response of donor-doped PZT is studied in situ during the application of electric fields in order to deduce the strain mechanisms which contribute to ferroelectric softening. X-ray diffraction from a synchrotron source is employed for this investigation. It was found that the use of different donor dopants results in distinctive, characteristic strain mechanisms that soften PZT. Sm and Nd aid in the softening of PZT solely by enhancing 90° domain wall mobility. However, La and Nb doping results in a material with coexisting ferroelectric phases. It was further found that Nb doping results in at least two additional strain mechanisms including interphase boundary motion and alarge strain in the (200) rhombohedral lattice plane. As piezoelectrics are also used in high temperature applications, the temperature dependence of the piezoelectric coefficient in soft doped PZT was also investigated. It was found that Sm doping leads to a high temperature (˜ 300°C)piezoelectric coefficient that is substantially greater than that found in La and Nb-doped PZT. In some cases, the coefficient in Sm-doped PZT is greater than that of La and Nd-doped PZT by a factor of two. Conventionally, the largest piezoelectric coefficient values are obtained in soft doped PZT by using a Zr:Ti ratio close to the morphotropic phase boundary (MPB). It is shown that in Sm-doped PZT, enhanced high temperature piezoelectric coefficients can also be obtained at compositions far from the MPB due to the presence of a mixed tetragonal and cubic phase. The mixed phase is hypothesized to enable a larger extrinsic piezoelectric response in Sm doped PZT due to enhanced strain accommodation in the coexisting polymorphic phases. In summary, it is presented that dopants yield signature,qualitative softening mechanisms, contributing differently to high piezoelectricity in PZT. The results suggest that in contrast to prior-held assumptions, an increase in Pb vacancies is not a necessary criterion for softening. ( en ) Advisors/Committee Members: Jones, Jacob L. (committee chair), Hummel, R. E (committee member), Andrew, Jennifer (committee member), Hess, Henry (committee member), Nishida, Toshikazu (committee member).

Subjects/Keywords: Ceramic materials; Dielectric materials; Domain walls; Doping; Electric fields; Electrical phases; High temperature; Temperature dependence; Wave diffraction; Zirconates; diffraction – lead – piezoelectric – softening – titanate – zirconate

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

APA (6^th Edition):

Seshadri, S. B. (2012). Investigation of Piezoelectric Softening Mechanisms in Lead Zirconate Titanate Using Diffraction and Property Measurements. (Doctoral Dissertation). University of Florida. Retrieved from http://ufdc.ufl.edu/UFE0045009

Chicago Manual of Style (16^th Edition):

Seshadri, Shruti B. “Investigation of Piezoelectric Softening Mechanisms in Lead Zirconate Titanate Using Diffraction and Property Measurements.” 2012. Doctoral Dissertation, University of Florida. Accessed October 20, 2019. http://ufdc.ufl.edu/UFE0045009.

MLA Handbook (7^th Edition):

Seshadri, Shruti B. “Investigation of Piezoelectric Softening Mechanisms in Lead Zirconate Titanate Using Diffraction and Property Measurements.” 2012. Web. 20 Oct 2019.

Vancouver:

Seshadri SB. Investigation of Piezoelectric Softening Mechanisms in Lead Zirconate Titanate Using Diffraction and Property Measurements. [Internet] [Doctoral dissertation]. University of Florida; 2012. [cited 2019 Oct 20]. Available from: http://ufdc.ufl.edu/UFE0045009.

Council of Science Editors:

Seshadri SB. Investigation of Piezoelectric Softening Mechanisms in Lead Zirconate Titanate Using Diffraction and Property Measurements. [Doctoral Dissertation]. University of Florida; 2012. Available from: http://ufdc.ufl.edu/UFE0045009

University of Florida

30. Pramanick, Abhijit. On the Correlation of Dynamic Electric-Field-Induced Structural Changes and Piezoelectricity in Ferroelectric Ceramics.

Degree: PhD, Materials Science and Engineering, 2009, University of Florida

URL: http://ufdc.ufl.edu/UFE0024334

► Piezoelectric ceramics are used in various devices such as sensors and actuators for conversion of electrical signals into mechanical signals and vice versa. In order… (more)

▼ Piezoelectric ceramics are used in various devices such as sensors and actuators for conversion of electrical signals into mechanical signals and vice versa. In order to gain more insight into the fundamental behavior of these materials, the present work reconciles macroscopic piezoelectric nonlinearities with respect to the electric-field-induced microstructural and crystallographic changes in ferroelectric lead zirconate titanate (PZT) ceramics. Nonlinearity and hysteresis in piezoelectric response under cyclic electric fields are investigated as a function of crystallographic phase (rhombohedral and tetragonal) and different dopants (undoped, La, and Fe). For longitudinal piezoelectric response, the amount of nonlinear contributions from irreversible extrinsic mechanisms in the rhombohedral phase is observed to be greater than in tetragonal phases for all amplitudes of applied electric fields. Likewise, La-doping increases the amount of nonlinear contributions from irreversible extrinsic mechanisms as compared to both undoped and Fe doped ceramics. The largest irreversible extrinsic contribution is observed to be about 55% of the total electric-field-induced strain for 2 atomic % La-doped rhombohedral PZT ceramics, for an applied electric field of plus or minus750 V/mm. Structural changes under the application of cyclic electric fields are measured by time-resolved diffraction using both laboratory and synchrotron X-ray sources. From time-resolved X-ray diffraction experiments, the largest non-180degree domain switching strains are observed for 2 atomic % La-doped tetragonal PZT ceramics of compositions close to the morphotropic phase boundary. It is further observed that both non-180degree domain switching and lattice strains can be nonlinear with respect to the applied electric fields. The nonlinear contributions from different structural changes to macroscopic electric-field-induced strains are subsequently analyzed. Quantitative analyses show only partial contribution from non-180degree domain switching towards macroscopic piezoelectric nonlinearity for La-doped and undoped compositions. This is consistent with certain additional nonlinear contributions determined from different hkl lattice strains. It is proposed that the nonlinear lattice strains originate through intergranular constraints and are therefore influenced by non-180degree domain switching in the material. It is therefore concluded that the displacement of non-180degree domain walls is the primary driving mechanism but not necessarily contribute exclusively towards macroscopic piezoelectric nonlinearity in ferroelectric PZT ceramics. ( en ) Advisors/Committee Members: Jones, Jacob L. (committee chair), So, Franky (committee member), Norton, David P. (committee member), Nino, Juan C. (committee member), Asthagiri, Aravind (committee member).

Subjects/Keywords: Amplitude; Ceramic materials; Conceptual lattices; Domain walls; Electric fields; Electrical phases; Hysteresis; Mathematical variables; Nonlinearity; Wave diffraction; ceramics, diffraction, domains, ferroelectrics, hysteresis, nonlinearity, piezoelectrics, pzt, synchrotron

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APA (6^th Edition):

Pramanick, A. (2009). On the Correlation of Dynamic Electric-Field-Induced Structural Changes and Piezoelectricity in Ferroelectric Ceramics. (Doctoral Dissertation). University of Florida. Retrieved from http://ufdc.ufl.edu/UFE0024334

Chicago Manual of Style (16^th Edition):

Pramanick, Abhijit. “On the Correlation of Dynamic Electric-Field-Induced Structural Changes and Piezoelectricity in Ferroelectric Ceramics.” 2009. Doctoral Dissertation, University of Florida. Accessed October 20, 2019. http://ufdc.ufl.edu/UFE0024334.

MLA Handbook (7^th Edition):

Pramanick, Abhijit. “On the Correlation of Dynamic Electric-Field-Induced Structural Changes and Piezoelectricity in Ferroelectric Ceramics.” 2009. Web. 20 Oct 2019.

Vancouver:

Pramanick A. On the Correlation of Dynamic Electric-Field-Induced Structural Changes and Piezoelectricity in Ferroelectric Ceramics. [Internet] [Doctoral dissertation]. University of Florida; 2009. [cited 2019 Oct 20]. Available from: http://ufdc.ufl.edu/UFE0024334.

Council of Science Editors:

Pramanick A. On the Correlation of Dynamic Electric-Field-Induced Structural Changes and Piezoelectricity in Ferroelectric Ceramics. [Doctoral Dissertation]. University of Florida; 2009. Available from: http://ufdc.ufl.edu/UFE0024334

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