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 1716 for “"SPHERICAL"”.
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Spherical antenna array
"The far field radiation pattern of an isotropic spherical antenna array with two types of element distributions, a latitude-longitude distribution and an approximately equally-spaced distribution, has been analyzed using Poisson's Sum Formula. Beamwidth expressions of both element distributions …
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Spherical ray-tracing
… or sections of spheres and naturally fit into spherical coordinates. When tracing rays through naturally spherical domains (for example, for visualization), converting to Cartesian coordinates introduces aberrations. Therefore, we seek an algorithm to natively cast rays through spherical …
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Spherical reflector feed field synthesis by geometrical optics and spherical wave expansion.
Thesis: M.S., Massachusetts Institute of Technology, Department of Electrical Engineering, 1970
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On spherical probability distributions
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mathematics, 1941.
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The spherical helical antenna
The spherical helical antenna is investigated as a new variation of the conventional helical antenna. The spherical helix is a wire antenna in a helix shape that is wound over a spherical surface instead of the standard cylindrical one. Analysis of this structure requires numerical methods and …
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Spherical wave reflection and transmission
… 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 new integral …
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The Asymmetrically Excited Spherical Antenna
Made available in DSpace on 2014-12-04T21:02:47Z (GMT). No. of bitstreams: 1 0013488.pdf: 4056576 bytes, checksum: fa714fe9a1aae3d433c376dd5d6a398e (MD5) Previous issue date: 1955
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Creep buckling of spherical shells.
Thesis. 1978. Ph.D.--Massachusetts Institute of Technology. Dept. of Ocean Engineering.
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Spherical indentation of magnetostrictive materials
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1999.
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SPHERICAL AND STOCHASTIC CO-CLUSTERING ALGORITHMS
… two novel Coclustering algorithms, named as Spherical Coclustering and Stochastic Coclustering, which utilize the existing K-means framework, furthermore a specific data construction, and two specific data normalization was included as a pre-processing step. The Coclustering framework …
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Analysis of a twin-spherical motor
… derives equations representing a twin-spherical motor. Basic ideas and some papers are reviewed, and the analysis begins with the derivation of current density waveforms for each geometry of slots and windings. From these current densities, flux densities are found analytically by the …
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Linear and multilinear spherical maximal functions
… to Lp(Rn) boundedness for the multilinear spherical maximal function in the largest possible open set of indices and we provide counterexamples that indicate the optimality of our results. Moreover, we obtain weak type and Lorentz space estimates as well as counterexamples in the endpoint …
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Determinant, Wall Monodromy and Spherical Functor
… GIT wall crossing. The wall monodromy is an EZ-spherical functor in the sense of Horja. By constructing a fibration structure on Z, we obtain a semi-orthogonal decomposition of the derived category of coherent sheaves of Z, hence decompose the EZ-spherical functor into a sequence of its …
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Design and analysis of spherical codes
"A spherical code is a finite set of points on the surface of a multidimensional unit radius sphere. This thesis gives two constructions for large spherical codes that may be used for channel coding and for source coding. The first construction ""wraps"" a finite subset of any sphere packing onto …
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GPU acceleration for spherical grid tomography
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-03-28 without embargo terms
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Signature change in spherical vacuum spacetimes
This thesis follows the approach of papers (1, 2) by exploring signature changes in other metrics. The metrics we chose to investigate are the Schwarzschild metric and the Tolman metric. The Schwarzschild metric was originally chosen in order to investigate whether the neighborhood of the …
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Neutron scattering from non-spherical nuclei
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Nuclear Engineering, 1964.
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Design of a Deformable Spherical Robot
The design of a uniquely actuated point-supported spherical robot is investigated to support the claim that deformable spherical robots that are point-supported can increase the speed of the robot. The spherical robot design investigated in this thesis has a unique actuation system because it uses …
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Helical Antennas with Truncated Spherical Geometry
A new variation of the spherical helical antenna made of a wire wound over a hemispherical surface and backed by a conducting ground plane is introduced. A constant spacing is maintained between the turns of winding. The geometry of this antenna is fully described by the number of turns and the …
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