Search results
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Title
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A NUMERICAL STUDY OF INTERFACIAL INSTABILITIES IN SHOCKED MATERIALS WITH SURFACE TENSION
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Author
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Bigdelou, Pedram
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Date Created
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2020
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Subjects--Topical
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Fluid mechanics, Physics
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Description
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Shock-driven multi-material flows occur in several applications including shock wave lithotripsy, underwater explosions, droplet combustion, propeller cavitation and ejection of material from surfaces subject to blast loading. Such flows are highl...
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Title
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Analysis of a Low Enriched Uranium Centrifugal Gas Core Reactor
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Author
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Leer, Darrin
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Date Created
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2020
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Subjects--Topical
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Fluid mechanics, Physics, Radiation, Nuclear physics
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Description
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With the new NASA directive of returning to the Moon in 2024 as a stepping stone to missions to Mars and beyond, there is a renewed interest in developing nuclear thermal rockets (NTR) to reduce trip times. This thesis will focus on the analysis o...
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Title
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Discrete Element Simulations of Powder Spreading in Additive Manufacturing
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Author
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Amrapurkar, Parth
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Date Created
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2020
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Subjects--Topical
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Mechanical engineering, Engineering, Physics
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Description
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Powder spreading plays a critical role in the quality of parts produced with selective laser sintering (SLS). Some of the important parameters that influence the quality of the powder bed are the powder particle size and distribution, blade speed,...
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Title
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Insights Derived From Studies on the Interaction of Wall Jets With an Elevated Hump Wake
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Author
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Sehman, Sean
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Date Created
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2020
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Subjects--Topical
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Mechanical engineering, Physics, Fluid mechanics
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Description
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ABSTRACTSEAN M. SEHMAN. Insights Derived from Studies on the Interaction of Wall Jets with an Elevated Hump Wake (Under the Direction of DR. MESBAH UDDIN) Underneath a travelling road vehicle, a channel flow develops between the road and the under...
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Title
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Investigation of impedance-matching techniques for infrared antennas
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Author
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Moreno Cleves, Camilo
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Date Created
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2020
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Subjects--Topical
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Electrical engineering, Optics, Physics
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Description
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In this study, we used scattering-scanning near-field optical microscopy (s-SNOM) to experimentally characterize several structures relevant to infrared (IR) antenna technology, by measuring the electric near-field strength as a function of positi...
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Title
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NONPROPAGATING EXCITATIONS IN 2-D
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Author
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Abney, Ray
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Date Created
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2020
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Subjects--Topical
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Physics
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Description
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Nonpropagating excitations have been studied in 1-D and in 3-D, but not so much in 2-D. So, this thesis concerns 2-D nonpropagating excitations. In particular, we construct nonpropagating excitations confined to an annulus under a time-independent...
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Title
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Optically Projected Length Scale for Use in Photogrammetry
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Author
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Thewlis, Patrick
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Date Created
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2020
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Subjects--Topical
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Optics, Physics
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Description
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Photogrammetry is a measurement technique where 3D coordinate data and feature information can be extracted from 2D photographs or images. Length scale objects are calibrated artifacts placed into a photogrammetry scene which have precisely define...
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Title
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Partially coherent radially polarized fractional vortex beam
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Author
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Gbur, Greg, Zeng, Jun, Liang, Chunhao, Cai, Yangjian
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Date Created
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2020
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Subjects--Topical
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Physics, Optics
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Description
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A new kind of partially coherent vector beam, named a partially coherent radially polarized fractional vortex (PCRPFV) beam, is introduced as a natural extension of the recently introduced scalar partially coherent fractional vortex beams [Zeng et...
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Title
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Propagation of radially polarized Hermite non-uniformly correlated beams in a turbulent atmosphere
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Author
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Gbur, Greg, Yu, Jiayi, Cai, Yangjian, Lin, Rong
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Date Created
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2020
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Subjects--Topical
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Physics, Optics
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Description
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We study the propagation properties of a recently introduced class of structured beams, radially polarized Hermite non-uniformly correlated (RPHNUC) beams, in a turbulent atmosphere using the extended Huygens-Fresnel integral and investigate how t...
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Title
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STRUCTURED OPTICAL MATERIALS FABRICATED USING TWO-PHOTON POLYMERIZATION
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Author
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Li, Yanzeng
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Date Created
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2020
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Subjects--Topical
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Materials science, Optics, Physics
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Description
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Artificially structured materials, which are treated as macroscopically homogeneous media, exhibit effective optical properties that can be altered by engineering the materials' intrinsic geometries at a scale much smaller than the probing electro...
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Title
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The evolution of spectral intensity and orbital angular momentum of twisted Hermite Gaussian Schell model beams in turbulence
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Author
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Gbur, Greg, Yu, Jiayi, Cai, Yangjian, Lin, Rong
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Date Created
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2020
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Subjects--Topical
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Physics, Optics
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Description
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We introduce a new class of twisted partially coherent beams with a non-unifirm correlation structure. These beams, called twisted Hermite Gaussian Schell model (THGSM) beams, have a correlation structure related to Hermite functions and a twist f...
