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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 18 of 18 for “"masers"”.
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Theoretical models for the polarization of astronomical masers
Made available in DSpace on 2011-06-08T16:51:06Z (GMT). No. of bitstreams: 1 1983_western.pdf: 4623969 bytes, checksum: 5f2feacd63b00f19e36b584d51336f60 (MD5) Previous issue date: 1983
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Propagation of radiation in astrophysical media: Gravitational lenses and astrophysical masers
… of the radiation emitted by astrophysical masers is studied by numerically solving the system of time dependent non-linear partial differential equations of radiative transfer through a masing gas. The calculations demonstrate for the first time how oscillations, with periods which are …
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The transfer of polarized radiation in astrophysical masers in the presence of magnetic fields
Restriction data tranferred 2014-07-01T11:13:46-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: Thesis
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The transfer of polarized radiation in astrophysical masers in the presence of magnetic fields
Polarized emission from astrophysical masers can provide important information about physical conditions in both star forming and circumstellar environments. Calculations are performed which give the spectra of the emergent maser radiation for different magnetic fields, radiative intensities, decay …
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The Structure and Polarization Properties of the SiO Masers in the Extended Atmosphere of R Aquarii
… conditions necessary for the formation of SiO masers dictate that they be produced in a region which is inside the silicate dust formation point close to the surface of the star. Very Long Baseline Interferometry (VLBI) has shown that these masers do indeed lie close to the stellar surface at a …
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Absorption spectroscopy using optical masers including a discussion of early investigations into the process of stimulated emission of radiation
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Physics, 1963.
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Dynamical and physical conditions of stellar formation : a study of H2O masers associated with galactic H [subscript II] regions
Thesis. 1976. Ph.D.--Massachusetts Institute of Technology. Dept. of Earth and Planetary Science.
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A molecular line and continuum study of water maser sources
… but which do lie close to otherwise isolated H2O masers. This thesis describes a search, based on catalogues of known water maser positions, for new deeply embedded cores similar to those found in S106 and M17. In addition to millimetre molecular line and submillimetre continuum observations, 22 …
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Observational and theoretical studies of SiO maser polarization toward late-type evolved stars: Insights from EVPA reversal features
… responsible for the polarization of SiO masers toward late-type evolved stars continue to be a subject of debate. Possible primary sources include the local magnetic field or anisotropic pumping, while additional polarization may arise due to conversion from linear to circular modes …
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Progress towards an optimized ¹²⁹Xe / ³He Zeeman maser and a test of boost symmetry
… between co-located ¹²⁹Xe and ³He Zeeman masers that sets a stringent limit on boost-dependent Lorentz and CPT violation involving the neutron, consistent with no effect at the level of 150 nHz. In the framework of the general Standard-Model Extension, our result provides the first clean …
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The far-ultraviolet spectroscopy of molecules of astrophysical interest
… astrophysical behaviour, in particular Celestial Masers. This thesis is preoccupied with the spectroscopy of H$_{2}$O, D$_{2}$O, OH, CO, and C$_{2}$H$_{2}$ in the region 1200$\AA$-400$\AA$ and absolute absorption coefficients are derived for CO and C$_{2}$H$_{2}$ using the Thomas-Reiche-Kuhn Sum …
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Predicting the future of atomic clocks using the Theory of Evolution
… in performance and prices are expected. The masers outperform the high performance cesium clocks for a time period of sub seconds to one day. The hydrogen maser is very mature product like cesium and the design has remained the same for the last 30 years. The product is expected to remain as …
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Investigation into a GPS time pulse radiator for testing time-stamp accuracy of a radio telescope
… clock ensemble consists of two hydrogen masers, an ultrastable crystal and GPS disciplined Rubidium clocks. During operation, the GTR radiates a broadband GPS time synchronised RF timing signal at a known distance from the telescope antennas and the corresponding timestamps were compared …
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Hybrid Magnonics in Antiferromagnets and Cavity Spintronic Devices
… for the development of spin-torque-oscillator masers. This thesis work serves as a foundation for future advancement of hybrid magnonic systems, highlighting their potential for both fundamental research and practical device applications.
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Radio & Infrared Observations of the W3/W4/W5 Star-forming Regions
… emission of organic molecules traced through masers. Hence, ancillary observations of W3 were made using the Onsala 20m radio viii telescope for maser source detection and a point source catalogue of ~ 1300 sources at far-IR wavelengths of predominantly cold proto-stars was made from the …
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Astronomical Interferometry at Submillimetre Wavelengths
… Continuum emission, spatially offset from the masers, was also detected with the interferometer, as was the CO (3-2) line. These data, particularly the offset continuum, are shown to be incompatible with single-star models for VY CMa. Instead, a binary model is proposed. This also helps to …
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Astrophysical tests of modified gravity
… tip of the red giant branch stars and water masers to place new constraints on the model parameters that are three orders of magnitude stronger than those previously reported. Finally, we perturb the equations of modified gravity hydrodynamics to first order and derive the equations governing …