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 220 for “"Reflectors"”.
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Corner reflectors
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Physics, 1943.
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Design of Ultra-wideband Reflectors
… This thesis investigates how ultra-wideband reflectors can be designed using novel approaches going beyond the conventional approaches listed above. Specifically, we investigate two new methods to design reflectarrays. In the first method, the reflector is designed as a Transformation Optics …
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Nanostructured Back Reflectors for Solar Cell Application
… to crystalline wafer based solar cells but back reflectors are needed to increase the absorption in these cells. Nano texturing is one of the widely used methods for fabricating solar cell back reflectors. Peak height and angle distribution are key parameters needed to understand the effect of …
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Design and behavior of ribless solar reflectors
Thesis. 1976. Ph.D.--Massachusetts Institute of Technology. Dept. of Aeronautics and Astronautics.
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Studies in Surface Acoustic Wave Reflectors and Resonators
Made available in DSpace on 2014-12-12T20:54:58Z (GMT). No. of bitstreams: 1 7915347.pdf: 2187352 bytes, checksum: 63bbb8442805ca5258b40c2e20c4026d (MD5) Previous issue date: 1979
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Neutronic evaluation of GCFR core diluents and reflectors
… for use as in-core diluents and as peripheral reflectors for Gas-Cooled Fast Reactor (GFR) service, using coupled Monte Carlo (MCNP) and isotopics (ORIGEN) codes. The principal performance indices compared were effects on beginning of irradiation multiplication factor, reactivity-lineated …
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Reflectors in upper mantle above the deep earthquakes.
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Science, 1974.
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Photoinduced Fresnel reflectors in germanium-doped optical fibers
… have been explored to characterize the Fresnel reflectors including optical time domain reflectometry (OTDR) and spectral analysis. In-line, optical fiber Fresnel reflectors have applications as internal mirrors in intrinsic Fabry-Perot interferometric (IFPI) sensors and OTDR distributed strain …
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Development of switchable planar reflectors for beam shaping realization
… design and performance optimization of planar reflectors within X-band and Ku-band frequency ranges. The objective of this work was to investigate the feasibility of using strategic slot embedded patch element configurations for an efficient reconfigurable reflectarray antenna design. PIN …
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Development and optimization of reconfigurable planar lenses and reflectors
Las antenas reconfigurables, capaces de conformar diferentes diagramas de radiación, son usadas en muchas aplicaciones de radio frecuencia. Entre las distintas antenas, los arrays de reflectores y las lentes reconfigurables son interesantes debido a la ausencia de red de distribución, que ahorra en …
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The replacement of reflectors by Albedo-type boundary conditions.
Thesis. 1976. Sc.D.--Massachusetts Institute of Technology. Dept. of Nuclear Engineering.
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Lithographically Fabricated Micro-Reflectors for Sensitive Point of Care Diagnostics
Timely diagnosis and treatment of infectious diseases calls for highly sensitive diagnostic assays. Traditional diagnostic methods include microscopy, polymerase chain reaction (PCR), immunofluorescence (IF) and enzyme-linked immunosorbent assay (ELISA). Many of these diagnostic methods, however, …
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Seismic wave propagation in thinly-layered media with steep reflectors
Includes bibliographical references.
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Scattering Matrix Analysis of Surface Acoustic Wave Reflectors and Transducers
The phased periodic array scattering parameters {1} have been modified and corrected for use as a single electrode, mixed units, scattering matrix consisting of one electrical and two acoustic ports. These scattering parameter analytical expressions are functions of material constants, electrode …
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Acoustic Bragg reflectors for Q-enhancement of unreleased MEMS resonators
… resonator, and the design of acoustic Bragg reflectors (ABRs) for energy localization and quality factor (Q)- enhancement for unreleased resonators. Two of the greatest challenges in MEMS are those of packaging and integration with CMOS technology. Development of unreleased MEMS resonators at …
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Performance enhancement of segmented infrared reflectors via quasistatic shape control
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1992.
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Improving Millimetre Wave Coverage in Indoor Environments using Convex Passive Reflectors
… ray paths for coverage using convex passive reflectors. A geometrical optics model has been developed to analytically evaluate coverage in office and straight corridor environments using convex spherical reflectors. Various reflector deployment strategies have been investigated by changing …
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Effects of random surface errors on the performance of paraboloidal reflectors
A program based on ray tracing has been developed to study the radiation patterns of paraboloidal reflector antennas whose surfaces are subjected to random errors with the emphasis on using an accurate representation of the statistics of the random surface errors. An ensemble of Gaussian random …
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Static Metasurfaces Reflectors with Independent & Complete Control of Magnitude & Phase
This thesis presents a static coupled resonator design capable of near complete control of the complex reflectance. Designed in the Ka band with no lumped elements required. The UC design is examined and demonstrated in several different surfaces, such as a multi-beam steering surface, capable of …
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