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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 709 for “"Spiral"”.
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The Equiangular Spiral Antenna
Made available in DSpace on 2014-12-04T21:02:59Z (GMT). No. of bitstreams: 1 0025214.pdf: 4973193 bytes, checksum: fe846796c713e9a79934008f006ec2cc (MD5) Previous issue date: 1957
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Characteristics of Spiral Flow
Made available in DSpace on 2014-12-05T17:15:26Z (GMT). No. of bitstreams: 1 5805410.pdf: 4827938 bytes, checksum: 984bebe10b23d8ab373f651ad4feea09 (MD5) Previous issue date: 1958
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Spiral architecture for machine vision
This thesis presents a new and powerful approach to the development of a general purpose machine vision system. The approach is inspired from anatomical considerations of the primate's vision system. The geometrical arrangement of cones on a primate's retina can be described in terms of a hexagonal …
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Dark Matter in Spiral Galaxies
… of five high surface brightness, late type spiral galaxies NGC 3810, NGC 3893, NGC 4254, NGC 5676 and NGC 6643, which were studied with the aim to quantify the luminous-to-dark matter ratio inside their optical radii. In order to meet this goal, the galaxies' morphology and gas kinematics …
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Vergleich der Niedrigdosis-Spiral-Computertomographie mit der konventionellen Spiral-Computertomographie in der Akutdiagnostik von Flankenschmerzen
Die Bedeutung der nativen Spiral-CT für die Diagnostik akuter Flankenschmerzen und speziell für die Detektion von Harnleitersteinen ist nach heutigem Kenntnisstand unbestritten. Vielfach wurden die exzellente Treffsicherheit und die differentialdiagnostischen Fähigkeiten dieser Methode bestätigt. …
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Dark Matter Halo Concentration and the Evolution of Spiral Structure in N-Body, Barred Spiral Galaxies
… between pitch angle (the tightness of spiral arm structure in the disk), P, and various indicators of central mass concentration, as well as the theoretical relationship between halo mass concentration and the density of visible matter in the central part of the galaxy, we look at a …
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Trump and the Spiral of Silence
… with Elizabeth Noelle-Neumann’s theory of the spiral of silence. Through conducting in-depth qualitative interviews with conservative students or alumni from the University of Houston and Texas A&M University, it was found that several participants from the University of Houston felt strong …
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Spiral tube heat exchanger for liquid metal
… for testing of various types of exchangers. The spiral tube type exchanger which I have chosen to investigate, though probably not original in design, was not included in the types chosen for investigation. As I believe that this type of exchanger shows promise as being suitable for this …
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Quantitative analysis of 3-arm spiral galaxies
A relatively small fraction of spiral galaxies has three spiral arms. It has been theorized that these "3-arm spirals" are relatively unstable and prone to decaying into even numbered patterns due to tidal interactions. We present a series of quantitative analyses on a large sample of 3-arm spiral …
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Spiral 2D array designs for volumetric imaging
… sampled at the Nyquist rate) based on geometric spiral structures, with the aim to reduce the number of array elements, and therefore transmit-receive channels required to meet a given acoustic specification. The aperiodic structure of these array designs is shown to minimise the height of …
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Static Mixing Spacers for Spiral Wound Modules
… or sheets. The sheet form is used to produce spiral wound modules that permit the efficient contacting of process streams with the membrane in a compact form. Spiral wound modules are the dominant form used in reverse osmosis and Nanofiltration membrane processes.Spacers are used in spiral …
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Metallicities and stellar populations in spiral bulges
… elliptical galaxies with those in the bulges of spiral galaxies, in an effort to compare, contrast and constrain their star formation histories. Long-slit spectroscopic observations of line-strengths and kinematics were carried out along the minor axes of 32 galaxies (ellipticals, SOs and spiral …
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A Study of the Equiangular Spiral Antenna
Made available in DSpace on 2014-12-08T22:23:51Z (GMT). No. of bitstreams: 1 6604221.pdf: 1860979 bytes, checksum: ab11f1ae7d92ed6ed2c9f710bc8a04b3 (MD5) Previous issue date: 1965
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Turbulence Characteristics in a Spiral Gas Stream
Made available in DSpace on 2014-12-05T17:15:24Z (GMT). No. of bitstreams: 1 0025277.pdf: 5982403 bytes, checksum: bf63087d7ff25bbf97015e2c9e50ee05 (MD5) Previous issue date: 1957
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Modeling of Spiral Waves Arising in Atrial Fibrillation
The objective of this study is to model spirals arising in atrial fibrillation. Spiral wave fronts, known to cardiologists as cardiac rotors, are responsible for heart arrhythmias. The modeling of the path of the spiral will ultimately assist in understanding why arrhythmias occur and how to treat …
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Design and analysis of a soft spiral gripper
… twisting around them. An embodiment of such a spiral gripper utilizes unique configurations of pneumatically actuated Fiber Reinforced Elastomeric Enclosures which has a range of motions like extension, rotation, contraction. This work presents a detailed analysis technique using Cosserat beam …
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A Theoretical Study of the Equiangular Spiral Antenna
Made available in DSpace on 2014-12-04T21:03:05Z (GMT). No. of bitstreams: 1 5900541.pdf: 1805369 bytes, checksum: b058d5d7acd8d24c7833497f725b2094 (MD5) Previous issue date: 1958
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Stellar Spiral Structures in Realistic Dark Matter Haloes
… I explore the formation and evolution of stellar spiral structures embedded in realistic dark matter haloes with very high resolution simulations. I first study the impact of the shape of the dark matter haloes. I find that non-adiabatic changes to the dark matter halo shape, commonly found in …
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Neutral hydrogen observations of spiral and irregular galaxies
… observations of two nearby galaxies af late spiral type, namely M33 and NGC 2403. The severe warping of the HI layer in the outer parts of M33 was clearly seen, and the origin of this phenomenon is discussed. Sensitive low-resolution maps reveal only a very slight warp in NGC 2403, while maps …
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