Dissertations / Theses: 'Reflection and refraction of light'

1

Azadeh, Mohammad. "Reflection and Refraction of Light from Nonlinear Boundaries." PDXScholar, 1994. https://pdxscholar.library.pdx.edu/open_access_etds/4715.

Full text

Abstract:

This thesis deals with the topic of reflection and refraction of light from the boundary of nonlinear materials in general, and saturating amplifiers in particular. We first study some of the basic properties of the light waves in nonlinear materials. We then develop a general formalism to model the reflection and refraction of light with an arbitrary angle of incidence from the boundary of a nonlinear medium. This general formalism is then applied to the case of reflection and refraction from the boundary of linear dielectrics. It will be shown that in this limit, it reduces to the well known Fresnel and Snell's formulas. We also study the interface of a saturating amplifier. The wave equation we use for this purpose is approximate, in the sense that it assumes the amplitude of the wave does not vary significantly in a distance of a wave length. The limits and implications of this approximation are also investigated. We derive expressions for electric field and intensity reflection and transmission coefficients for such materials. In doing so, we make sure that the above mentioned approximation is not violated. These results are compared with the case of reflection and refraction from the interface of a linear dielectric.

APA, Harvard, Vancouver, ISO, and other styles

2

Porritt, Dawn, and n/a. "The magnificent play of light: seeing the difference." University of Canberra. Design and Architecture, 2007. http://erl.canberra.edu.au./public/adt-AUC20081023.115855.

Full text

Abstract:

Light as a concept is filled with a multitude of interpretations, ideas and possibilities and no matter how technologically progressive we think we are, nature consistently controls our human way of life. We are surrounded by nature and often gain inspiration by the simple things around us. My interest in the phenomena of light and refraction was sparked years ago by Claude Monet?s painting Bathers at La Grenouillere, 1869. It showed simplicity of form and shape, yet emitted a luminosity and radiance of light reflecting off water. This thesis examines the subject of light as an optical phenomenon. My specific aim was to create distorted, ambiguous and conflicting images in my photographs by using the "optical phenomena" of light such as, refraction, diffraction and reflection as a basis for abstracting reality. I wanted to capture the changes that occur when light changes direction due to refractive qualities within a material such as glass, water or plastic, or due to the reflective qualities of a surface. The camera was exploited for its capacity to capture realism, but also to capture and abstract natural phenomenon. The images were enlarged to magnify details and the reality of the physical world was heightened as objects became ambiguous. Design compositional techniques were used to decontextualise objects. I approached this study with the idea that observation and awareness has importance to image making within my design and teaching practice. This thesis presents my project explorations showing the play of light on and through surfaces under different conditions. I have documented this by producing a series of photographic images and a glossary as an aid in the practice of design education.

APA, Harvard, Vancouver, ISO, and other styles

3

Wang, Chia-Hao. "Context Awareness." Thesis, Konstfack, Inredningsarkitektur & Möbeldesign, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:konstfack:diva-5870.

Full text

Abstract:

From anti-modernism to the movement of regaining identity, in one way or another, we are all somehow looking for ways to find the harmony in this world. Respecting nature, be aware of the environment and co-exist with it, is worth further investigation. That is why I chose to examine the relationship of context and interior, with the help of natural light.

APA, Harvard, Vancouver, ISO, and other styles

4

Pospíchal, David. "Systém pro měření lokálních IR spekter." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2021. http://www.nusl.cz/ntk/nusl-442520.

Full text

Abstract:

The diploma thesis deals with the design of a system for measuring infrared spectra from local areas of samples. The theoretical part describes the electromagnetic waves and related phenomena. Furthermore, the semiconductor junction and solar cells are discussed. The following is a basic description of line spectrometers. In the practical part, a suitable arrangement of the whole system, collimator design, and especially the core of the whole work, ie control software and signal processing, are proposed.

APA, Harvard, Vancouver, ISO, and other styles

5

Beaman, Heather. "Reflection-Refraction." VCU Scholars Compass, 2009. http://scholarscompass.vcu.edu/etd/1888.

Full text

Abstract:

I find my inspiration by looking at the world around me. I take snapshots, compose photographs, and collect physical objects from my surroundings. I interpret these materials by layering printmaking, mixed media, and alternative photographic processes. I use the simplification of the human form when developing the composition. As my work takes shape, I present a universal person placed in a situational narrative. Layering the human figure with my travels and experiences creates a pause or an intimate moment that the viewer shares with the art work.

APA, Harvard, Vancouver, ISO, and other styles

6

Zhang, Jie. "Nonlinear refraction and reflection traveltime tomography." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/10717.

Full text

APA, Harvard, Vancouver, ISO, and other styles

7

Azzeer, A. M. A. "Some nonlinear laser induced reflection and refraction phenomena." Thesis, Swansea University, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.635819.

Full text

Abstract:

This thesis is primarily concerned with some laser-induced nonlinear reflection and refraction phenomena in lithium niobate (LiNbO₃) crystals. These are photorefraction and phase conjugation. These phenomena are caused by nonlinear optical processes and the underlying basic theory is presented. A critical review of the theory of phase conjugation by Degenerate Four-Wave Mixing (DFWM) of coherent laser beams is given and an analysis and a simple mathematical description of photorefraction, i.e. light-induced refractive index changes, are presented. Laser beam coupling by two-wave mixing and phase conjugation by four-wave mixing in photorefractive media are discussed in detail. Relevant physical properties of LiNbO₃ crystals were measured and are described. An account of the design of experiments and the apparatus used in the present study to investigate photorefraction and phase conjugation in LiNbO₃ are presented. The characteristics of the He-Cd laser used in the experimental investigation were measured and are described. Experiments were conducted using two-wave mixing to yield the photorefractive parameters of LiNbO₃ which were then used in the interpretation of the experiments in which phase conjugation was observed in DFWM studies. Details of the procedures and the results are given together with estimates obtained for diffusion and photovoltaic field strengths in the conditions used in the present investigation. Photographic evidence of the corrective removal of optical distortion from laser beam propagating through LiNbO₃ cyrstal is given.

APA, Harvard, Vancouver, ISO, and other styles

8

Taguchi, Kazue. "LLUM: Light and Reflection." VCU Scholars Compass, 2007. http://hdl.handle.net/10156/1527.

Full text

APA, Harvard, Vancouver, ISO, and other styles

9

Anderson, Brian Benjamin. "Grating light reflection spectroscopy /." Thesis, Connect to this title online; UW restricted, 1996. http://hdl.handle.net/1773/8600.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

Stigloher, Johannes [Verfasser], and Christian [Akademischer Betreuer] Back. "Reflection and Refraction of Spin Waves / Johannes Stigloher ; Betreuer: Christian Back." Regensburg : Universitätsbibliothek Regensburg, 2018. http://d-nb.info/1173974873/34.

Full text

APA, Harvard, Vancouver, ISO, and other styles

11

Leeson, Bernard Alan. "Managing to learn - learning to change : reflection and refraction in action." Thesis, University of Sheffield, 1996. http://etheses.whiterose.ac.uk/10243/.

Full text

Abstract:

This qualitative practitioner research is set in a mixed, rural 11-16 Church of England Comprehensive School. It embraces reflective action enquiry into leadership and management of innovation in a turbulent period of national educational change. It is founded on the belief that if change processes are to be understood widely, practitioners must share experience emanating from reflective and analytical practice. This study is about "managing to learn" It embraces concepts of managing personal learning; managing colleagues' and students' learning; and managing processes leading to the emergence of the school as a "learning organisation" It is also about "learning to change" and espouses learning to promote personal change; learning to facilitate change in others; and learning to establish institutional change as a natural on-going characteristic of organisational life. This study is founded on a process of "reflection", as characterised by Schön (1983). Consequently, it employs a process of personal reflection on leadership roles in managing change and learning processes. It employs processes of reflection on cultural and political aspects of organisational life and resultant manifestations and implications of introducing, implementing, and institutionalising organisational and cultural change. This research utilises "refraction"- that is, convergence and divergence. Firstly, it promotes divergent and creative ways of organising which encourage and facilitate innovative processes. Secondly, it employs processes of converging, focusing, and concentrating on taken-for-granted "critical incidents" in the life of a developing school, to elicit meanings of events as understood by participants. Thirdly, it applies cultural and political prisms to school organisation, together with autocratic, bureaucratic, adhocratic, and reticular-democratic lenses in order to elucidate important cultural, political and organisational data. Finally this research is about "action" It is about doing, intervening, intending, committing, motivating, accomplishing, fulfilling and achieving. The essential concept and understanding of "action" is that it should be informed action.

APA, Harvard, Vancouver, ISO, and other styles

12

Shu, Kun-Tien. "Multidimensional reflection and refraction of infinite amplitude stress waves in elastic solids." Diss., Georgia Institute of Technology, 1990. http://hdl.handle.net/1853/17680.

Full text

APA, Harvard, Vancouver, ISO, and other styles

13

Samson, Claire. "Recording the Kapuskasing pilot reflection survey with refraction instruments : a feasibility study." Thesis, McGill University, 1985. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=66063.

Full text

APA, Harvard, Vancouver, ISO, and other styles

14

Xia, Wenjun. "Refraction of nonlinear light beams in nematic liquid crystals." Thesis, University of Edinburgh, 2013. http://hdl.handle.net/1842/7726.

Full text

Abstract:

Optical spatial solitons in nematic liquid crystals, termed nematicons, have become an excellent test bed for nonlinear optics, ranging from fundamental effects to potential uses, such as designing and demonstrating all-optical switching and routing circuits in reconfigurable settings and guided-wave formats. Following their demonstration in planar voltage-assisted nematic liquid crystal cells, the spatial routing of nematicons and associated waveguides have been successfully pursued by exploiting birefringent walkoff, interactions between solitons, electro-optic controlling, lensing effects, boundary effects, solitons in twisted arrangements, refraction and total internal reflection and dark solitons. Refraction and total internal reflection, relying on an interface between two dielectric regions in nematic liquid crystals, provides the most striking results in terms of angular steering. In this thesis, the refraction and total internal reflection of self-trapped optical beams in nematic liquid crystals in the case of a planar cell with two separate regions defined by independently applied bias voltages have been investigated with the aim of achieving a broader understanding of the nematicons and their control. The study of the refraction of nematicons is then extended to the equivalent refraction of optical vortices. The equations governing nonlinear optical beam propagation in nematic liquid crystals are a system consisting of a nonlinear Schr¨odinger-type equation for the optical beam and an elliptic Poisson equation for the medium response. This system of equations has no exact solitary wave solution or any other exact solutions. Although numerical solutions of the governing equations can be found, it has been found that modulation theories give insight into the mechanisms behind nonlinear optical beam evolution, while giving approximate solutions in good to excellent agreement with full numerical solutions and experimental results. The modulation theory reduces the infinite-dimensional partial differential equation problem to a finite dynamical system of comparatively simple ordinary differential equations which are, then easily solved numerically. The modulation theory results on the refraction and total internal reflection of nematicons are in excellent agreement with experimental data and numerical simulations, even when accounting for the birefringent walkoff. The modulation theory also gives excellent results for the refraction of optical vortices of +1 topological charge. The modulation theory predicts that the vortices can become unstable on interaction with the nematic interface, which is verified in quantitative detail by full numerical solutions. This prediction of their azimuthal instability and their break-up into bright beams still awaits an experimental demonstration, but the previously obtained agreement of modulation theory models with the behaviour of actual nematicons leads us to expect the forthcoming observation of the predicted effects with vortices as well.

APA, Harvard, Vancouver, ISO, and other styles

15

Hobro, James William Douglas. "Three-dimensional tomographic inversion of combined reflection and refraction seismic travel-time data." Thesis, University of Cambridge, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.621515.

Full text

APA, Harvard, Vancouver, ISO, and other styles

16

Chauhan, Ajay P. S. "Structure of the Northern Sumatra : subduction megathrust using seismic reflection and refraction data." Paris, Institut de physique du globe, 2010. http://www.theses.fr/2010GLOB0003.

Full text

Abstract:

La subduction au Nord de Sumatra est une subduction oblique où la plaque Indo-Australienne subducte sous la plaque Eurasienne dans sa configuration actuelle depuis au moins le milieu de l'ère tertiaire. Le 26 decembre 2004, un grand séisme de magnitude Mw 9. 3 non attendu s'est produit. Un important tsunami a été généré lorsque la rupture est arrivée en surface causant de nombreuses catastrophes en Asie du Sud Est. A la suite de ce séisme, le troisième plus important mesuré au cours des derniers 50 ans, une série de campagnes sismiques ont été réalisées au large des côtes du Nord de l'île de Sumatra, avec l'objectif de caractériser les structures et la tectonique de ce système de subduction. L'expérience sismique a impliqué l'acquisition de données de sismique réfraction grand angle sur 56 OBS déployés le long d'un profil de 560 km perpendiculairement à la subduction, dans la région où le glissement cosismique était maximum. Un autre profil coincident a été acquis pour relever des données de sismique réflexion avec une flûte de 12 km de long. Ces données sont venues compléter les données de sismique réflexion grand angle. Dans cette thèse, je présente les résultats obtenus par l'inversion tomographique de données grand angle, ainsi que l'image de sismique réflexion correspondante. L'interprétation combinée de ces résultats m'a permis d'imager la structure complète de la zone de subduction, où une fine croûte océanique (5-5. 5 km), de 50-55 Ma, couverte d'une couche de sédiments de 5. 5 km, résulte en la formation d'un cône d'accrétion de 170 km d'extension latérale avec une profondeur maximum de ~22-24 km. L'angle de pente de la croûte océanique qui subducte change quand elle descend sous le manteau avant arc, en montrant une "bending-flattening". Un "backstop" continental incliné vers l'océan a été identifié sous le bassin avant arc de Aceh contre lequel le cône d'accrétion continue d'évoluer. Un peu plus au Nord Est, la structure de subduction est marquée par la présence d'une fine plaque continentale sus-jacente, le Moho reposant à une profondeur de 20 km, ceci résultant de l'étirement de la croûte selon des processus de pull-apart. L'arc volcanique sous-marin, est remarquablement profond et délimité de part et d'autre par les failles de Sumatra. Une autre découverte importante est l'identification du "backthrust" à l'Est du bassin de Aceh, le long duquel le "foreac" continue de se soulever comme observé dans l'étude après choc. Les failles de "backthrust" expliquent les modèles tectoniques d'évolution des îles d'avant arc pour Sumatra. Plus important, ce "backthrust" explique la source complexe du tsunami du 26 Decembre 2004. En effet la source était composé d'une source primaire située sur le "main thrust" et d'une source secondaire sur le "backthrust", ceci pouvant expliquer les arrivées primaires et la forte amplitude du tsunami au nord de Sumatra
Northern Sumatra subduction megathrust is an oblique plate boundary where the Indo-Australian plate subducts underneath the Eurasia plate in its' current setting at least since the middle Tertiary time. On 26 December 2004 a massive magnitude Mw 9. 3 earthquake struck this plate boundary, which based on conventional understanding was unexpected. A huge tsunami ensued as the rupture arrived near the surface causing widespread loss along the coast lines of south-east Asia. In the wake of the third largest earthquake recorded in the last 50 years, a set of seismic experiments were conducted offshore northern Sumatra with the objective of characterizing the structure and tectonics of this subduction system. The experiment involved the acquisition of active wide-angle seismic refraction dataset on 56 ocean bottom seismometers (OBS) deployed along a ~520 km long profile nearly orthogonal to the subduction strike, in the zone of maximum coseismic slip during the Sumatra-Andaman earthquake. A coincident deep seismic reflection dataset was acquired along the same profile using a very long (~12 km) streamer to complement the wide angle seismic data and to be able to demarcate the structural boundaries more accurately. In this thesis, I present the results obtained from the tomographic inversion of the wide angle seismic dataset, and the coincident seismic reflection image as derived from the deep seismic reflection data. The combined interpretation of theses results allows me to image the entire subduction megathrust structure, starting from the subduction front where a thin (5. 0-5. 5 km) oceanic crust, about 50-55 My old, laden by a layer of sediments upto 5. 5 km thick, deriving from the Nicobar fan result in the formation of a large accretionary wedge of about ~170 km lateral extent and maximum thickness of ~22-24 km underneath the forearc high. The downgoing slab remarkably changes its' dip slope as it descends beneath the forearc mantle showing a bending-flattening pattern. A seaward dipping continental backstop is identified underneath the Aceh forearc basin against which the accretionary wedge continues to evolve. Further landwards, the subduction structure is marked by the presence of a thin overlying plate, with continental Moho lying at a depth of ~20 km, arguably resulting from the stretching of the crust as a result of the pull-apart mechanism related to the same processes which result in the opening of the Andaman basin further north. The sub-marine volcanic back arc is remarkably deep where two deep basins have formed characterizing the pull apart activity by the segments of dextral Sumatra fault which stretches along the volcanic arc. Another important finding of this study is the identification of backthrusting branches at the seaward edge of the Aceh forearc basin, along which the forearc high continues to uplift, as evidenced from aftershock studies in the region. These backthrust faults, interpreated as strike-slip branches in past studies, do explain the tectonic evolution of forearc islands all along the Sumatra subduction zone. More importantly the backthrust branches explain the complex source of the 26 December 2004 tsunami, which it is argued might have resulted from coseismic rupture not only along the main subduction thrust but also by a secondary source slipping along the backthrusts, and thus explaining the early arrival and high amplitude of the run-off wave at the northern tip of Sumatra

APA, Harvard, Vancouver, ISO, and other styles

17

Harsha, Senusi Mohamed. "Interpretation of Southern Georgia coastal plain velocity structure using refraction and wide-angle reflection methods." Thesis, Georgia Institute of Technology, 1988. http://hdl.handle.net/1853/25886.

Full text

APA, Harvard, Vancouver, ISO, and other styles

18

Esser, Gregor. "Derivation of analytical refraction, propagation and reflection equations for higher order aberrations of wavefronts." Doctoral thesis, Universitat Politècnica de Catalunya, 2012. http://hdl.handle.net/10803/125065.

Full text

Abstract:

Derivation of analytical refraction, propagation and reflection equations for Higher Order Aberrations of wavefronts From literature the analytical calculation of Lower Order Aberrations (LOA) of a wavefront after refraction, propagation and reflection is well-known, it is for local Power and Astigmatism performed by the Coddington equation for refraction and reflection and the classical vertex correction formula for propagation. However, equivalent analytical equations for Higher Order aberrations (HOA) do not exist. Since HOA play an increasingly important role in many fields of optics, e.g. ophthalmic optics, it is the purpose of this study to extend the analytical Generalized Coddington Equation and the analytical Transfer Equation, which deals with second order aberration, to the case of HOA (e.g. Coma and Spherical Aberration). This is achieved by local power series expansions. The purpose of this PhD was to extend the analytical Generalized Coddington Equation and the analytical Transfer Equation, which deals with Lower Order Aberrations (power and astigmatism), to the case of Higher Order Aberrations (e.g. Coma and Spherical Aberration). In summary, with the novel results presented here, it is now possible to calculate analytically the aberrations of an outgoing wavefront directly from the aberrations of the incoming wavefront and the refractive or reflective surface and the aberrations of a propagated wavefront directly from the aberrations of the original wavefront containing both low-order and high-order aberrations.

APA, Harvard, Vancouver, ISO, and other styles

19

Jiao, Lingxiu. "Imaging of the Sudbury Structure, Ontario, Canada, using the seismic reflection and refraction method." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/NQ62644.pdf.

Full text

APA, Harvard, Vancouver, ISO, and other styles

20

Hananto, Nugroho. "Architecture and Evolution of North Sumatra Subduction Zone based on long Offset Seismic Reflection and Wide Angle Seismic Refraction / Reflection Data." Institut de physique du globe (Paris), 2011. http://www.theses.fr/2011GLOB1203.

Full text

APA, Harvard, Vancouver, ISO, and other styles

21

Harutyunyan, Satenik. "Magnetic and Elastic Interactions at Cracks and Interfaces in Ferromagnetic Materials." Diss., Virginia Tech, 2008. http://hdl.handle.net/10919/29209.

Full text

Abstract:

In addition to being useful for some nondestructive evaluation techniques, interactions between magnetic fields and defects in solids may also alter material properties. To explore this possibility, Maxwellâ s equations were coupled with a continuum mechanics model for elastic strain to formulate analytical expressions for the interaction of a magnetic field with several crack geometries. The influence of crack velocity and a realistic (nonlinear) magnetic susceptibility were included into a model of this type for the first time and shown to introduce unexpected trends in the magneto-elastic stress intensity. Singularities magneto-elastic stresses appear at different combinations of magnetic field strength and crack velocity, and the stresses at the crack tip switch sign. In a related study, the interaction of an alternating magnetic field with elastic stress through was explored through a coupling effect known as magneto-acoustic resonance. A model for the phenomena, in which magnetic waves excite elastic waves and vice versa, was formulated and used to explore the spin (magnon) and anti-plane elastic (phonon) interactions in piecewise homogeneous ferromagnetic spaces with two different sets of properties. The model suggests some combinations of magnetic field and frequency can produce a new kind of wave to appear. These new waves, which we call Accompanying Surface Magnetoelastic (ASM) waves, are localized at the interface between the two ferromagnetic media and they accompany reflection and transmission waves. It is shown that the amplitudes of the reflected, transmitted, and ASM waves depend strongly on magnetic field strength, frequency, and the angle of the incident wave, as well as on the physical properties of ferromagnetic media.
Ph. D.

APA, Harvard, Vancouver, ISO, and other styles

22

Schmelzbach, Cedric. "Seismic-Reflection and Seismic-Refraction Imaging of the South Portuguese Zone Fold-and-Thrust Belt." Doctoral thesis, Uppsala universitet, Geofysik, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-8302.

Full text

Abstract:

The South Portuguese Zone (SPZ), which host world-class massive sulphide deposits, forms the southern fold-and-thrust belt of the Iberian Variscan orogeny. This thesis focuses on seismic-reflection and seismic-refraction processing efforts on a subset of the IBERSEIS deep seismic-reflection data set aiming at resolving the SPZ upper crust in high resolution. A comparison of different crooked-line seismic-reflection imaging schemes showed that a processing sequence involving dip-moveout corrections, a common-midpoint projection, and poststack time migration of common-offset gathers provided the most coherent images considering the crooked acquisition geometry. Correlation with surface-geological data allows four units of different reflection character to be identified: the ~0–2 km deep Upper Carboniferous Flysch group, the highly reflective ~2–4 km thick and up to ~5 km deep Volcano-Sedimentary Complex (VSC) group, and two deep Paleozoic metasedimentary units, with the shallower Phyllite-Quartzite group exposed in an antiform. Prominent diffracted energy was enhanced using a modified Kirchhoff imaging routine. High reflectivity and distinct diffractions mark extensive dike bands at 6–12 km depth, possibly related to the intense hydrothermal activity that led to the formation of the ore-bearing VSC group. Source-generated noise obscures potential signals from depths shallower than ~500m depth on the seismic-reflection sections. P- and SV-wave first-arrival traveltimes were inverted for velocity models imaging the shallowest crust. Overall, the velocity models correlate well with surface-geological data marking high (>5.25 km/s) and uniform P-velocities for the Flysch unit in the southern SPZ. A prominent P-wave low-velocity body (~4.5 km/s) is resolved where the Phyllite-Quartzite unit forms the core of an antiform. P-velocities fluctuate the most in the northern SPZ with Flysch group units exhibiting high velocities (>5.25 km/s) and VSC group bodies showing intermediate velocities (~5 km/s). Low VP/VS-ratios (~1.8) computed for the southern profile part are interpreted as less deformed Flysch-group units, whereas high VP/VS-ratios (~1.9) indicate fractured units.

APA, Harvard, Vancouver, ISO, and other styles

23

McKinney, Jill S. "The decision to study abroad : a reflection or refraction of gender ideology in American culture?" Virtual Press, 2007. http://liblink.bsu.edu/uhtbin/catkey/1365517.

Full text

Abstract:

Anthropology has long understood that cultures proscribe gender-specific roles. This thesis explores how gender role dynamics in America may contribute to more college women going abroad to study than college men. The past decade of data consistently indicates that two-thirds of American students studying abroad are female. While this statistic seems counterintuitive to the stereotype that Americans rear boys to be adventurous and girls to be protected; ethnographic methods were primarily used to identify and analyze the cultural scripts that influence female decision-making among this population. This research will reflect the web of complex and competing cultural scripts students face regarding the decision to study abroad, many of which are at least influenced by gender and socially transmitted by their families.
Department of Anthropology

APA, Harvard, Vancouver, ISO, and other styles

24

Laughlin, Kenneth J. "Interpretation of refraction and reflection stack data over the Brevard fault zone in South Carolina." Thesis, Virginia Tech, 1988. http://hdl.handle.net/10919/45905.

Full text

Abstract:

Near surface structures across the Brevard fault zone are studied using the refraction and reflection arrivals recovered from the Appalachian Ultradeep Core Hole (ADCOH) regional seismic Line 1. In using refracted arrivals, a new processing approach is introduced that translates refracted first arrivals from multifold seismic data into a refraction stack of two-way delay time sections. Reprocessing of reflected arrivals has improved shallow reflectors and allowed better imaging of the Brevard fault zone. Following processing of refraction and reflection arrivals independently, both data sets are combined into a composite stack section. The composite stack section displays one bright refractor interpreted as the boundary between the weathered layer and high velocity crystalline rocks. This refractor is continuous in the Inner Piedmont with occasional vertical offsets. The continuity of the refractor diminishes across the Brevard fault zone. In the eastern Blue Ridge, the refractor is discontinuous with high angle truncations. On the composite stack section, the Brevard fault zone can be traced from the surface to 6 km (2 s) where it appears to splay from the Blue Ridge thrust. Different from previous interpretations, the Brevard fault zone is imaged as having both an upper and a lower boundary surface as well as a group of reflectors within the zone. This reflection package initially thickens to 2 km at 3 km depth, then thins as it reaches the Blue Ridge master decollement. The Blue Ridge thrust is as shallow as 1.5 km (0.5 s) at the northwest end of the Line l. A deeper decollement is interpreted below the Blue Ridge thrust. The depth of this deeper thrust is 3 km (1 s) at the northwest end of the line, and also joins to the Blue Ridge thrust at 6 km depth making the structures below the Brevard fault zone more complex than previously published.

Master of Science

APA, Harvard, Vancouver, ISO, and other styles

25

Seymour, Matt. "Theorizing Reflection and Refraction within Dialogic Literary Argumentation in the Teaching of Sing, Unburied, Sing." The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1590666596628712.

Full text

APA, Harvard, Vancouver, ISO, and other styles

26

Schnieders, Dirk. "Light source estimation from spherical reflections." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2011. http://hub.hku.hk/bib/B45892970.

Full text

APA, Harvard, Vancouver, ISO, and other styles

27

Eidhammer, Trude. "Determining particle index of refraction with measurements of scattering at two angles." Laramie, Wyo. : University of Wyoming, 2006. http://proquest.umi.com/pqdweb?did=1296094721&sid=1&Fmt=2&clientId=18949&RQT=309&VName=PQD.

Full text

APA, Harvard, Vancouver, ISO, and other styles

28

Wei, Tai-Huei. "Nonlinear Optical Absorption and Refraction Study of Metallophthalocyanine Dyes." Thesis, University of North Texas, 1992. https://digital.library.unt.edu/ark:/67531/metadc278287/.

Full text

Abstract:

This dissertation deals with the characterization of the nonlinear absorption and refraction of two representative metallophthalocyanine dyes: chloro aluminum phthalocyanine dissolved in methanol, referred to as CAP, and a silicon naphthalocyanine derivative dissolved in toluene, referred to as SiNc. Using the Z-scan technique, the experiments are performed on both the picosecond and nanosecond timescales at a wavelength of 0.532 μm.

APA, Harvard, Vancouver, ISO, and other styles

29

Ouellette, Guy René. "Nonimaging light concentration using total internal reflection films." Thesis, University of British Columbia, 1991. http://hdl.handle.net/2429/30246.

Full text

Abstract:

Here is presented a method of fabricating nonimaging light concentrators from total internal reflection film (TIRF). Prototypes have been made and tested, and found to operate in agreement with predictions of ray-tracing codes. The performance is comparable with that of concentrators made from specular reflecting materials.
Science, Faculty of
Physics and Astronomy, Department of
Graduate

APA, Harvard, Vancouver, ISO, and other styles

30

Padmabandu, Gamaralalage Gunasiri 1956. "Angular momentum of light and its mechanical effects on a birefringent medium." Thesis, The University of Arizona, 1988. http://hdl.handle.net/10150/276914.

Full text

Abstract:

The torque exerted by a beam of polarized light on a half-wave plate which alters its state of polarization is calculated for several laser wavelengths and intensities using electromagnetic theory. The second-order torque that arises through the nonlinear interaction is formulated and the numerical values are calculated for the 42m crystal class. The experiment used to detect the existence of the torque is reviewed and a demonstration experiment is suggested.

APA, Harvard, Vancouver, ISO, and other styles

31

De, Leon Arizpe Israel. "Spectral domain analysis and application of reflection and refraction phenomena in two-dimensional dielectric periodic structures." Thesis, University of Ottawa (Canada), 2005. http://hdl.handle.net/10393/26885.

Full text

Abstract:

This thesis is intended to contribute to an analytical understanding of refraction and reflection phenomena of monochromatic electromagnetic fields at the interface between homogeneous media and two-dimensional PhCs by studying the k-space (Fourier domain) representation of the refracted and reflected fields. The goal is to provide physical explanations of distortion effects experienced by the fields when interacting with the periodic medium, and to evaluate quantitatively such effects through the analysis of the fields' angular spectra. The motivation for this investigation is the interesting reflection and refraction phenomena observed when light propagates across the interfaces between homogeneous dielectric regions and photonic crystals (PhCs), which is a situation often found in integrated optical systems. Such reflective and refractive phenomena play an important role in the operation of such systems. (Abstract shortened by UMI.)

APA, Harvard, Vancouver, ISO, and other styles

32

Patel, Dhara Yogendra. "Reflection." Thesis, Virginia Tech, 2011. http://hdl.handle.net/10919/32832.

Full text

Abstract:

â Reflectionâ is an experiment with what I call â symbolic architectureâ i.e. design where the features of the building have a profound meaning or a strong recall to some familiar aspect in our lives. It is a meditation center designed to rejuvenate visitors by providing an ideal environment to practice and teach meditation. The design is inspired by concepts of Hindu philosophy and each element of the building, the light, the materials, the water and the structure is likened to an element of the spiritual being that helps a meditator achieve a connection between the body and the soul.
Master of Architecture

APA, Harvard, Vancouver, ISO, and other styles

33

Zeng, Zheng. "Reflection and absorption of light in butterfly wing scales /." View abstract or full-text, 2008. http://library.ust.hk/cgi/db/thesis.pl?PHYS%202008%20ZENG.

Full text

APA, Harvard, Vancouver, ISO, and other styles

34

Rumpfhuber, Eva-Maria. "An integrated analysis of controlled-and passive source seismic data /." To access this resource online via ProQuest Dissertations and Theses @ UTEP, 2008. http://0-proquest.umi.com.lib.utep.edu/login?COPT=REJTPTU0YmImSU5UPTAmVkVSPTI=&clientId=2515.

Full text

APA, Harvard, Vancouver, ISO, and other styles

35

Buckner, Jesse Conard. "Crustal Structure in a Mesozoic Extensional Terrane: The South Georgia Rift and the Epicentral Area of the 1886 Charleston, South Carolina, Earthquake." Thesis, Virginia Tech, 2011. http://hdl.handle.net/10919/31210.

Full text

Abstract:

On August 31, 1886 a large scale earthquake occurred in Summerville, S.C. causing severe damage in the coastal city of Charleston. Although intensive geological and geophysical studies have been conducted in the area, uncertainty remains about the details of the event. Recently evidence from seismic reflection profiles have shed light on the tectonic environment of the area. The epicentral area of the 1886 event lies within the South Georgia Rift, a Mesozoic rift terrane. Previous studies have revealed clues to the geologic structure and evolution of this feature. SEISDATA4 is the largest seismic reflection profile recorded in the area. By re-processing the line, information about the tectonic structure of the area was revealed. The early Mesozoic extensional basin that hosted the 1886 earthquake and is host to the modern seismicity recorded in the area, extends several kilometers to the south and west of Charleston, along SEISDATA4. Cenozoic and Mesozoic faults were resolved within the basin and along its northwestern boundary that is distinguished by a strong gradient in the magnetic field. However, the question as to which fault was responsible for the rupture of 1886 still remains. The refraction analysis provides better resolution of the lithology in Lower Mesozoic section. The termination of the strong reflection at the base of the Atlantic Coastal Plain occurs in a section of the profile that shows major disruption of the underlying reflections, and suggests that the termination of a lower Mesozoic basalt flow responsible for the reflection may be related to tectonic deformation.
Master of Science

APA, Harvard, Vancouver, ISO, and other styles

36

Okure, Maxwell Sunday. "Upper mantle reflectivity beneath an intracratonic basin : insights into the behavior of the mantle beneath Illinois basin /." Diss., CLICK HERE for online access, 2005. http://contentdm.lib.byu.edu/ETD/image/etd865.pdf.

Full text

APA, Harvard, Vancouver, ISO, and other styles

37

Smith, Sean A. "Development of grating light reflection spectroscopy for chemical sensing applications /." Thesis, Connect to this title online; UW restricted, 2000. http://hdl.handle.net/1773/11592.

Full text

APA, Harvard, Vancouver, ISO, and other styles

38

Nordqvist, Amanda. "Colour and light." Thesis, Högskolan i Borås, Akademin för textil, teknik och ekonomi, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-10378.

Full text

Abstract:

This work explores how colour and light can be used as the prime design materials. They are investigated in unison in relation to spatiality. Colour is a way for us to understand and identify what we see, it is primary for how we interpret our surroundings. The aim is to explore colour, light and reflections, by the means of printing and dyeing of translucent materials, as an attempt to challenge the visual perception of the spectator and the experience of how spatiality is perceived. The project investigates how the boundaries of a textile can be questioned, for example where does a pattern begin and end? Does it only belong to the textile or can it transcend to it’s surroundings? The investigational process is experimental and explores combinations of colour and light in translucent materials, coloured through the techniques of heat transfer printing and dyeing. Swatches made are analysed in relation to each other and to light, with a focus on their visual performance. The final design examples discusses the idea of how textile, light and colour can be used to create, define and illuminate spatiality.

APA, Harvard, Vancouver, ISO, and other styles

39

Čajko, František. "Nano-focusing of light electromagnetic analysis and simulation /." Akron, OH : University of Akron, 2009. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=akron1249331504.

Full text

Abstract:

Dissertation (Ph. D.)--University of Akron, Dept. of Electrical and Computer Engineering, 2009.
"August, 2009." Title from electronic dissertation title page (viewed 9/23/2009) Advisor, Igor Tsukerman; Committee members, Nathan Ida, Iqbal Husain, Ernian Pan; Department Chair, Alex De Abreu Garcia, Dmitry Golovaty; Dean of the College, George K. Haritos; Dean of the Graduate School, George R. Newkome. Includes bibliographical references.

APA, Harvard, Vancouver, ISO, and other styles

40

Jordt, Anne [Verfasser]. "Underwater 3D Reconstruction Based on Physical Models for Refraction and Underwater Light Propagation / Anne Jordt." Kiel : Universitätsbibliothek Kiel, 2014. http://d-nb.info/1133543006/34.

Full text

APA, Harvard, Vancouver, ISO, and other styles

41

Pietsch, Christopher Alexander. "Reflections of Color and Light." Thesis, Virginia Tech, 2014. http://hdl.handle.net/10919/50419.

Full text

Abstract:

An integral part of human vision is the perception of color through the reflection of light. At any moment the human eye is receiving a complex polychromatic reflection of its environment, and the human mind is perceiving many hundreds or thousands of colors. In architecture, light is often a primary consideration in a design, but color is rarely discussed. It makes its presence known, however, as the light entering into a building will carry with it the reflections of the environment. The elements of architecture appear quite different at varying times of the day; at varying times of the year. Even at the same time of day two walls painted the same color will appear as two different colors if placed in different light conditions. This thesis attempts to capture this phenomenon and elaborate on the possibilities of working with light through reflection. It is not meant to give a specific answer, but rather to show the results of a search to find a way of working with light through color.
Master of Architecture

APA, Harvard, Vancouver, ISO, and other styles

42

Stiles, Mary. "The art of light : a reflection on a piece for orchestra." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq48230.pdf.

Full text

APA, Harvard, Vancouver, ISO, and other styles

43

Hamad, Mazen Lee. "Exploring and developing the instrumental aspects of grating light reflection spectroscopy /." Thesis, Connect to this title online; UW restricted, 2003. http://hdl.handle.net/1773/8610.

Full text

APA, Harvard, Vancouver, ISO, and other styles

44

Hughes, Stephen. "Crustal structure of northeastern North America : results from the Ontario-New York-New England seismic refraction/wide-angle reflection experiment." Thesis, University of Leicester, 1992. http://hdl.handle.net/2381/35043.

Full text

Abstract:

The Ontario-New York-New England seismic refraction/wide-angle reflection profile was acquired to investigate the deep structural interrelationships between the southeastern Grenville province and the western New England Appalachians. The Grenville province is characterized by 45 km thick crust, with an average crustal seismic velocity of 6.6 km/s and a Poisson's ratio of 0.28+0.01. In the mid-crust a laminated dome-like body is inferred to be composed of mafic cumulate sills on the basis of its high velocity (7.1 km/s) and Poisson's ratio (0.27). The lower crust is characterized by a velocity of 7.0 km/s which suggests a strongly mafic composition such as garnet pyroxene granulite. The Moho is a variable feature, characterized by en-echelon reflections suggestive of compositional interlayering. An anomalous mantle layer with a velocity of 8.6 km/s is proposed to represent an eclogized basaltic layer added to the lithosphere during Grenvillian orogenesis. The boundary between the Grenvillian craton and the western New England Appalachians is marked by an eastward dipping ramp structure which penetrates to a depth of 25 km where it soles out above a transitional mid-lower crustal interface. The New England Appalachians are characterized by an average crustal velocity of 6.4 km/s and a sharply reflective Moho delineating crustal thinning from 41 km to 37 km towards the Atlantic margin. The lower crustal velocity is 6.8 km/s, with a Poisson's ratio of 0.26+0.01. In contrast to the Grenvillian craton the seismic properties of the Appalachian lower crust are consistent with an intermediate composition interlaced with mafic sills related to extensional underplating and intrusion during the rifting of the Atlantic Ocean.

APA, Harvard, Vancouver, ISO, and other styles

45

Weis, R. Stephen. "Electromagnetic transmission and reflection characteristics of anisotropic multilayered structures." Diss., Georgia Institute of Technology, 1987. http://hdl.handle.net/1853/13546.

Full text

APA, Harvard, Vancouver, ISO, and other styles

46

Lebedeva-Ivanova, Nina. "Geophysical Studies Bearing on the Origin of the Arctic Basin." Doctoral thesis, Uppsala universitet, Geofysik, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-121757.

Full text

Abstract:

Deep troughs and ridges of the Arctic Basin are some of the least known features of the Earth's crust. Some of the ridges, eg. Chukchi and Nordwind, are connected directly to the continental shelves and are certainly submarine promontories of the latter. The character of the Lomonosov Ridge as a narrow slice of continental crust that separated from the Eurasian margin in the early Cenozoic (by opening of the Eurasian Basin), is not in doubt. Recent drilling (ACEX) and piston coring have confirmed this interpretation. However there are many other ridges and some of the troughs that are of uncertain origin. Seismic research in combination with potential field data over the East-Siberian margin, Podvodnikov and Makarov basins and the Mendeleev Ridge, presented here, provides a framework for understanding this enigmatic part of the Earth. The constrained models of the crust illustrate their structure. The crust beneath the East Siberian margin is up to 40 km thick; it thins to about 20 km towards to the Podvodnikov Basin. The models over the Arlis Gap, in the middle of the Podvodnikov Basin, and the Mendeleev Ridge have shown that the crust beneath both these features is anomalously thick (up to 28–32 km) and has a velocity structure that suggests the presence of highly attenuated continental crust. The crustal thickness over the Makarov Basin varies from 8 km to 15 km. Reflection profiles provide evidence of the character and thickness of the sedimentary cover (mostly Cenozoic and late Mesozoic), both on the ridges and beneath the troughs. Presented here is evidence that some of the ridges (eg. Marvin Spur) appear to be fragments of continental crust rifted off the Lomonosov Ridge (with a similar, unconformable Cenozoic cover); however, they gently plunge into and beneath troughs (eg. Makarov Basin). Reflection seismic data collected by the HOTRAX expedition in 2005 over the central part of the Lomonosov Ridge illustrate the sedimentary structure on the top of the Ridge and in an internal basin. The main sedimentary units can be interpreted by correlation with the ACEX results. The major fault separating the surrounding ridges from the internal basin appears to have a roll over anticline in the hanging wall, suggesting that the basin was created by a growth fault. The seismic lines provide evidence of gently folded basement beneath the Lomonosov Ridge with intra basement reflections are usually parallel to the upper surfaces; in combination with velocities (c. 4–5 km/s), these suggest the presence of old well-consolidated sediments.

APA, Harvard, Vancouver, ISO, and other styles

47

Olyphant, Jared Russell, and Jared Russell Olyphant. "Seismic Investigations Applied to Landscape Evolution and Tectonic Development: Valles Caldera, New Mexico and Guinea Plateau, West Africa." Diss., The University of Arizona, 2017. http://hdl.handle.net/10150/626753.

Full text

Abstract:

Geophysical investigation of the subsurface through seismic refraction and reflection methods provides an efficient and non-invasive means towards addressing geologic problems across multiple scales. Both seismic techniques, in an active-source exploration setting, involve inducing acoustic waves into the subsurface and measuring their propagation velocities and amplitudes. These measurements have physically-based relationships with the properties of the underlying strata, thus allowing changes in the seismic measurements to be interpreted with respect to changes in the subsurface geology. Two applications of the seismic method are presented in this dissertation: (1) shallow seismic refraction acquisition and processing applied to the near-surface investigations of soil and regolith, which constitute the Critical Zone (CZ), beneath the upland hillslopes of the Valles Caldera, New Mexico; (2) interpretation of 2-D and 3-D marine seismic reflection data that image the upper 10-km of the crust beneath the Southern Guinea Plateau, offshore Guinea, West Africa. In both cases, the seismic data provide necessary constraints for the generation of accurate subsurface models that permit further geophysical modeling. The near-surface results, presented in Appendix A, provided a rich dataset of weathered thicknesses across hillslopes that supported an investigation of potential relationships between CZ geologic architecture and topographic attributes. Quantified relationships suggest that calibrated predictions based on the topography can provide first-order estimates of regolith thickness across upland landscapes. These results add to the ongoing CZ-science endeavor to understand proposed links between subsurface weathering processes and their surface expressions. In Appendix B, interpretations of high-resolution 3-D seismic data have illuminated deformational structures associated with Mesozoic rifting of the Southern Guinea Plateau. The interpretations were expanded onto regional 2-D seismic profiles, permitting a regional synthesis of the southern margin’s structural evolution. Additional tectonic subsidence and forward-gravity modeling highlight the influence of Jurassic rifting on the Southern Guinea Plateau prior to Early-Cretaceous rifting and separation, as well as crustal thickness estimates from the continental shelf out towards oceanic crust. Lastly, the Guinea-Demerara conjugate plateaus, and their associated deformations, were restored to 100 Ma, revealing an apparent upper-crustal asymmetry between the two margins. Appendix C presents two seismic-exploration methodologies based on 3-D seismic reflection data: (1) the calculation and interpretation of two co-rendered volumetric seismic attributes – most-positive curvature and semblance; (2) numerically modeling the tectonic subsidence of an entire 3-D seismic survey. Both techniques are used to address the inherent difficulty in interpreting the extent to which Jurassic rifting affected the Southern Guinea Plateau. Furthermore, the numerical model of subsidence provides a new exploration technique towards qualitatively and quantitatively assisting in the assessment of potential hydrocarbon-bearing basins.

APA, Harvard, Vancouver, ISO, and other styles

48

Romer-Jordan, Zachary L. "The Threshold of Experience: A Journey Toward Inward Reflection." University of Cincinnati / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1275667134.

Full text

APA, Harvard, Vancouver, ISO, and other styles

49

Gebregziabher, Gared Berhanu [Verfasser]. "Environmental and engineering geophysical studies for sinkhole problems using seismic reflection, refraction tomography, electrical resistivity imaging, and joint inversions / Berhanu Gebregziabher Gared." Hannover : Technische Informationsbibliothek und Universitätsbibliothek Hannover (TIB), 2011. http://d-nb.info/104185143X/34.

Full text

APA, Harvard, Vancouver, ISO, and other styles

50

Holliger, Klaus Holliger Klaus Holliger Klaus Holliger Klaus. "Ray-based image reconstruction in controlled-source seismology with an application to seismic reflection and refraction data in the central Swiss Alps /." [S.l.] : [s.n.], 1991. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=9335.

Full text

APA, Harvard, Vancouver, ISO, and other styles

Dissertations / Theses on the topic 'Reflection and refraction of light'

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles