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 56 for “"Spectral Lines"”.
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Microwave spectral lines in galactic dust globules.
Thesis: Ph. D., Massachusetts Institute of Technology, Department of Physics, 1976
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Radio frequency spectral lines associated with infrared objects.
Massachusetts Institute of Technology. Dept. of Physics. Thesis. 1971. Ph.D.
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Multiple Velocity Component Analysis of Ammonia Spectral Lines in High-Mass Star-Forming Regions
High-mass star-forming regions are turbulent and chaotic environments that contain the seeds to produce massive stars. Previous analyses of dense gas in nearby low-mass star-forming regions have identified the presence of multiple coherent velocity structures overlapping along the line of sight. We …
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Search for Gamma-ray Spectral Lines with the Fermi Large Area Telescope and Dark Matter Implications
… about their mass. We have searched for spectral lines in the energy range 5 to 300 GeV using 3.7 years of Fermi LAT data, reprocessed with updated calorimeter calibration constants, and an improved energy dispersion model from previous LAT Collaboration line searches. We search in five …
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Fscan Code Development For Advanced Ligo Detector Characterization
… to long-duration noise that appears as spectral lines. FScan is a tool for finding spectral lines and is used to identify the lines that appear in the gravitational-wave data; it is also used to characterize LIGO's detectors. This thesis details work in rewriting the plotting portion of …
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Effects of convection and non-equilibrium radiation transfer in stellar atmospheres /
… equilibrium (NLTE) on the formation of spectral lines of different chemical elements in the atmospheres of different metallicity main sequence turn-off (MSTO) and red giant branch (RGB) stars. The influence of convection is assessed by analyzing differences in the elemental abundances …
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Em busca de um novo indicador Espectroscópico do período de rotação das Estrelas do tipo solar
… observed oscillations of both the depth of the spectral line and its equivalent width, and analysis of the return information about the characteristics of solar magnetism. It also aims to find patterns of solar magnetic activity cycle and the average period of rotation of the Sun will indicate …
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Excitation processes in the positive column of electrical discharges in inert gases
… with the current i, of the intensity, I, of neon spectral lines emitted from low pressure positive column discharges has been studied as part of an investigation of excitation processes in these discharges. The results indicate that two-step excitation is important for many neon lines. …
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Application of adaptive optics to the spectroscopic investigation of small-scale solar structures
… contrast in the G-band as well as in the atomic spectral lines. We suspect the existence of two contrast enhancement mechanisms for bright points one exclusively for the G-band, one independent of specific spectral lines. We perform calculations using the results of a three-dimensional …
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Sonoluminescence as a probe of acoustic cavitation
… and tungsten carbonyl solutions. The observed spectral lines correspond to atomic emission from the metal atoms. The intensity of sonoluminescence from Cr(CO)$\sb6$ was studied as a function of dissolved gases to determine the effect of thermal conductivity and $\gamma$ (C$\sb{\rm p}$/C$\sb{\rm …
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Terahertz wave-molecule interactions via CMOS chips : from comb gas sensor with absolute specificity to ultra-stable, miniaturized clock
… frequency and absorption intensity of rotational spectral lines are directly linked to the micro-scale molecular structures. They serve as an indicator or "finger-print" of molecules. Thus, a rotational spectrometer with absolute specificity is promising for the analysis of complicated gas …
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Sparse Modeling of Grouped Line Spectra
… models for estimation of line spectra, when the spectral content of a signal source is assumed to exhibit some form of grouping. Different from previous parametric approaches, which generally require explicit knowledge of the model orders, this thesis exploits sparse modeling, where the orders …
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The 3-D topology of magnetic fields in and around sunspots
… brightenings in the G band, where a lot of spectral lines of the CH molecule are present. Inside magnetic fields, the density is reduced, as the magnetic pressure contributes to the pressure balance equation. Thus, the reduced density allows to see to deeper layers of the atmosphere with …
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Sizing the X-ray spectral resolution limits of the REgolith X-ray Imaging Spectrometer (REXIS) instrument at Asteroid 1999RQ36
… will be flying on board the Origins Spectral Interpretations Resource Identification Security Regolith Explorer (OSIRIS-REx) asteroid sample return mission that will be visiting the asteroid 1999 RQ36 and sending a sample back to Earth. REXIS will detect elemental XRF lines and …
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Improved magnetic resonance chemical shift imaging at 3 Tesla using a 32-channel integrated RF-shim coil array
… chemical shift displacement of metabolites, spectral line broadening as well as complicated water and lipid suppression; which reduce spectral quality. The main goal of this work is to compensate Bo imperfections and therefore mitigate aforementioned artifacts to earn enhanced spectral …
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Studying the atmosphere of HD 189733 b using the Rossiter-McLaughlin effect
… spectroscopic data are only sensitive to narrow spectral features and do not preserve broadband features. This makes them insensitive to the strong Rayleigh scattering slope of HD 189733 b that is due to possible atmospheric aerosols. The Rossiter-McLaughlin (RM) effect provides a way to probe …
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DIAGNOSTICS AND REAL-TIME MONITORING OF PULSED LASER ABLATION
… By evaluating when intensities of ITO spectral lines reduce to zero, the laser processing can be monitored in real time. By checking whether spectral lines for the substrate ablation appear, the processing without substrate damage can be fulfilled. Compared with other signal detection …
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Fourth order spectral theory and diffusion-driven instability
… asymptotic growth, cascading and phantom spectral lines. In Part II, we analyze diffusion-driven (Turing) instability of a reaction-diffusion system. The innovation is that we replace the traditional Laplacian diffusion operator with a combination of the fourth order bi-Laplacian operator …
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Database and Application Programming Interface Development for Rotational Spectroscopy
… of the automation pipeline for assigning spectral lines to species. While there are existing databases available for use, we developed our custom database, named SAAGAdb, and an application programming interface (API) to access the database to fulfill the needs of SAAGA. SAAGAdb is …
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