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 20 for “"Infrared observations"”.
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Radio & Infrared Observations of the W3/W4/W5 Star-forming Regions
… Frequency Array (LOFAR) Surveys KSP, targeted observations of H II regions close to high mass star-forming regions in the Galactic plane have been conducted, as part of the telescope’s commissioning. This thesis details the calibration and analysis of one particular commissioning field, the …
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Non-LTE diagnostics of the infrared observations of the planetary atmosphere
The analysis of the infrared measurements of a number of sophisticated space experiments requires modeling of molecular infrared radiation with accounting for the nonlocal thermodynamic equilibrium (non--LTE). In this dissertation a general formulation is given of the multilevel …
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The evolution of star-forming galaxies : analysis of infrared observations by AKARI
… results of several projects on the analysis of infrared observations of star-forming galaxies, all of which included observations by the AKARI Space Telescope. Spectroscopic redshifts have been measured for over 400 galaxies using the fibre spectrograph AAOmega in the AKARI Deep Field South, the …
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Optical and near infrared observations of accretion processes in galactic compact objects
In this thesis, we present optical and near-infrared observations of compact binary systems. The observations are used to refine the binary parameters of several Low Mass X-ray Binaries, and to better understand the accretion processes in these systems. Accretion is essential in the formation of …
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Effects of starspots activity on optical and near infrared observations of planetary transits
… by using broad-band photometry, from visible to infrared, helps to constrain spots effects by estimating the R parameter, i.e. the ratio of the relative variations in the stellar fluxes at short wavelength optical bands (e.g., U or B) to near-infrared ones (e.g., J or K). Its numerical value can …
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Planetary infrared observations : the occultation of 28 Sagittarii by Saturn and the dynamics of Jupiter's atmosphere
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1995.
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From Spitzer mid-infrared observations and measurements of peculiar velocities to constrained simulations of the local universe
… the calibration of that relation in the mid-infrared with observational data from Spitzer Space Telescope. Resulting accurate distance estimates will be included in the third catalog of the project. In the meantime, two catalogs up to 30 and 150 Mpc/h have been released. We report …
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Studies of solar white-light flares and small-scale magnetic structures observed in the near infrared
Using the most advanced infrared imaging technology as developed by NJIT, detailed study of solar white-light flares and small magnetic structures, such as faculae and pores, are presented in this dissertation. The investigations focus on near-infrared observations at 1.56 um, which are good proxy …
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Atomic processes in nova shells
… of the shell. Finally, the results of some near-infrared observations made on the shells of CP Pup, RR Pic and T Pyx are reported.
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Multiwavelength behaviour of Cygnus X-3 and related objects
… X-ray binary Cygnus X-3 at radio, (sub)mm, infrared, red-optical and X-ray wavelengths. Further unusual properties of the system are unearthed and previously expounded models are refined by new observations. In order to address the broader picture, a multiwavelength comparison of Cygnus X-3 …
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Understanding the Star -Forming Environment in Stellar Clusters
… Herbig Ae/Be stars are sampled. Mid- and near-infrared observations identifying young stars and millimeter interferometric observations probing dense molecular gas and dust continuum are presented. These observations are used to reveal the large-scale young stellar population around the …
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Dusty gust fronts and their contributions to long-lived convection in West Africa/
… A novel technique is developed using satellite infrared observations to track these fronts' propagation over a much longer distance than the <80 km enabled by radar; gust fronts are shown to propagate over >1000 km (mean 750 km) and up to 24 hours, much further than has been previously …
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Quantifying various thunderstorm characteristics during high impact events using radar and satellite observations
… their changes, using radar and satellite observations. Using an object-based technique, I compare the Integrated Multi-Satellite Retrievals for Global Precipitation Measurement (IMERG) and ground radar based Multi-Radar Multi-Sensor Quantitative Precipitation Estimates (MRMS) over the …
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Observations, Thermochemical Calculations, and Modeling of Exoplanetary Atmospheres
… used Spitzer multi-wavelength secondary-eclipse observations to characterize planetary atmospheres. We chose targets with high signal-to-noise ratios, as their deep eclipses allow us to detect signatures of spectral features and assess planetary atmospheric structure and composition with greater …
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A multi-frequency study of symbiotic stars
Multi-frequency observations using a wide variety of telescopes and instrumentation have been used to throw light upon some of the physical characteristics of symbiotic stars. A detailed understanding of these enigmatic binaries requires the planning of large, simultaneous observing campaigns to …
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Investigating Interstellar dust in the Milky Way through X-ray scattering and absorption
Interstellar dust strongly affects astronomical observations across the entire electromagnetic spectrum. In the optical and ultraviolet bands, it produces extinction and reddening that must be corrected for both Galactic and extragalactic sources. At longer wavelengths, its thermal emission …
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Controlling the Stereoregularity of Polyacrylonitrile and Its Determination Using Small-Molecule Host Inclusion Compounds
… diameter (5.25-5.5Å). However, in our FTIR observations run at room temperature, a different type of transformation was detected. AN urea IC before and the PAN urea IC after low temperature γ-ray irradiation polymerization are both large tetragonal structures, which have a larger channel …
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Binary Star Systems with Asymmetrically Heated Disks: Thermal Phase Curves for the Disk in Epsilon Aurigae
… debated from the near absence of solid state infrared spectral features indicating its composition, particle size distribution, and density. An investigation of a wide parameter space by means of analytic, Monte Carlo radiative transfer (MCRT), and thermal inertia-dependent methods are …
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The influence of planetary and stellar companions on debris discs
Around 20% of main-sequence stars are known to host debris discs composed of planetesimals and the dust produced in their collisions. The structures of these discs can be constrained through spectral energy distribution (SED) modelling or direct imaging of the dust. Gravitational perturbations in a …