Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 47 for “"Reflection and Transmission"”.
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Spherical wave reflection and transmission
This study is concerned with the reflection and transmission of spherical waves at a plane interface between two different media. The phenomenon of the reflection and transmission of spherical waves has been studied by means of analytical methods, numerical computation, and experimental tests. A …
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Reflection and transmission coefficients in multi-wave inhomogeneous media.
Massachusetts Institute of Technology. Dept. of Electrical Engineering. Thesis. 1970. Ph.D.
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Joint identification in structural waveguides using wave reflection and transmission coefficients
… engineering applications, such as pipe systems and beam networks in constructions. Currently available techniques are undermined by inadequate ability to model the joints and other discontinuities due to uncertainty in their properties. Measured modal data can be used to update joint models, but …
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Measurements and modelling of reflection and transmission from smooth and rough surfaces at 62 GHz
… This latter is associated with signal delays and signal level fades due to reflections, scatters, transmissions and diffractions by obstacles surrounding the environment. Indoor and outdoor building layout often influence the signal. In order to understand and mitigate the signal decay, …
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A study of the reflection and transmission of a water-hammer pressure wave from a tee
A theoretical analysis was made of the reflected and transmitted waves which were produced when a water-hammer pressure wave encountered a tee in the pipeline. The analysis included the fact that a hydraulic loss existed across the tee. Relationships were developed for determining the magnitude of …
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Arbitrarily Oriented Biaxially Anisotropic Media: Wave Behavior and Microstrip Antennas
… (or simply biaxial) media is presented. The reflection and transmission behaviors of electromagnetic waves from half-space and two-layer isotropic-biaxial interfaces are studied. The reflection and transmission coefficients are used in the formulation of eigenvector dyadic Green's functions. …
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Inline microring reflector for photonic applications
… logic gates, sensors, switches, multiplexers, and laser cavities. The Bragg grating is a periodic structure that allows the selection of a narrow bandwidth of spectrum for stable lasing operation. In this dissertation, we study analysis and simulations of a compact microring based reflector …
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Asymptotic description of the acoustic microscopy of a surface-breaking crack
… are characterized by a large Fresnel number and a F-number of order one, the Fourier integrals can be asymptotically approximated to obtain explicit expressions for the incident wavefield and the wavefield scattered from a defect-free surface. The latter wavefield contains the leaky Rayleigh …
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A Riemann-Hilbert approach to scattering on a one-dimensional semi-infinite crystal
… we obtain an explicit formula for the reflection coefficient off the crystal. We discuss the limiting cases of the strong and weak potentials. For compactly supported potentials we present a general result regarding a relation between the reflection and transmission coefficients.
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Design and fabrication of a recycled carrier modulator
In this thesis, I outline several design and fabrication approaches that can be used to achieve a Distributed Bragg Gratings on a Lithium Niobate (LiNbO3) based substrate. These gratings function as wavelength selective mirrors and help create a Fabry-Perot resonator topology for recycling an …
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SEISMIC SIGNATURES OF PORE CONNECTIVITY
… Firstly, I use the Zoeppritz equation to analyze reflection coefficient's sensitivity to eight medium parameters; results show they all have significantly different sensitivity. Friability is an empirical parameter introduced in General Singular Approximation (GSA) to measure the extent of pore …
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Scandium Oxide Thin Films and Their Optical Properties in the Extreme Ultraviolet
This study reports on the physical and optical characterization of scandium oxide thin films. Thin films of scandium oxide, 20-40 nm thick, were deposited on silicon wafers, quartz slides, and silicon photodiodes by reactively sputtering scandium in an oxygen environment. These samples were …
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Interaction of acoustic waves and anisotropic multilayered composite plates immersed in water.
… anisotropic composite plates is presented. Reflection and transmission coefficients as a function of the plane wave incident angle and ultrasonic wave frequency are computed for single layered and multilayered plates. From the minima of the reflection spectra one can obtain the Lamb wave …
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Characterization of VCSELs for Circuit Simulation
… The first model includes the nonlinear gain and carrier recombination characteristics. Rate equation parameters are extracted from static current-light-voltage (I-L-V), time domain turn-on delay, and ac reflection and transmission measurements. The parameters are demonstrated to be suitable …
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A study of periodic gratings in planar dielectric waveguides
… wavelength division multiplexing applications and as end mirrors for narrow linewidth lasers. A study of the spectral characteristics of both single and double gratings in planar dielectric waveguides is presented. The analysis of light propagation in a planar dielectric waveguide with …
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Modeling Electromagnetic Wave Propagation in Electrically Large Structures
… large structures due to the amount of memory and processing power required, necessitating approximate analyses with limited applicability. In this research a hybrid modeling methodology is adopted to solve these complex problems more efficiently than unified numerical methods and more …
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Ultrasonic wave propagation in thick, layered composites containing degraded interfaces
… is introduced. Elastic material properties and measured 'values of ultrasonic phase velocity and attenuation are used to represent E-glass and vinyl ester resin fiber-reinforced plastic (FRP) laminate, syntactic foam, and resin putty materials in the model. The ultrasonic phase velocity in …
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Development of phonon-polarization THz spectroscopy, and the investigation of relaxor ferroelectrics
… develops phonon-polariton based THz spectroscopy and uses this technique to make the first THz frequency dielectric measurements of a relaxor ferroelectric crystal, in particular KTao0.982Nb0.018O3 (KTN 1.8). THz spectroscopy has emerged as an important probe for a wide variety of systems with the …
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New methods for measuring spectral bi-directional transmission and reflection using digital cameras
… in buildings. Distribution of visible light and near infrared radiation can be optimized to enhance daylighting and reduce thermal loads. Light redirecting window systems are one of many innovative fenestration systems available for improving the daylighting and thermal performance of …
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Determing the Properties of Dense Matter: Superconductivity, Bulk Viscosity, and Light Reflection in Compact Stars
… from a microscopic theory of nucleons, and calculate the coupling strengths between quasiparticles. We then calculate the structure of magnetic flux tubes, taking into consideration interactions between neutron and proton Cooper pairs. We find that interactions between the condensates …
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