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 85 for “"emission lines"”.
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Aluminum-hydride formation in the relaxation zones following shock waves in the atmosphere of long-period variable stars
<p>The phase variations of AlH emission lines in LPV spectra were investigated using a model of the post-shock relaxation zone. Conditions at the shock were linked to position in the atmosphere and phase by a global, isothermal shock model. In the relaxation zone model, 78 species were considered, …
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Digital analysis of narrow band imagery of the Cygnus loop
… and spectral line ratio maps involving emission lines from six different ionic species are shown. The detailed morphology of the remnant and correlations between various line ratios are discussed in the context of recent shock model calculations. The spatial structure is categorized on …
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Emission Line Galaxies from CADIS : High Redshift Lyman-Alpha Galaxies and Metal Poor Galaxies at Medium Redshift
… for and investigated in a sample of 600 faint emission line galaxies from four fields of the Calar Alto Deep Imaging Survey (CADIS). Employing an imaging Fabry-Perot interferometer, CADIS detects emission lines in three waveband windows, free of night-sky emission lines, at 700 nm, 820 nm, and …
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Oscillator strength measurements in singly-ionized, doubly-ionized and neutral lanthanides and transition elements (sm, nd, pr, gd, cu, and fe) using laser-induced breakdown spectroscopy.
… correct interpretation of stellar absorption and emission spectra. It is well known that calculations of many astrophysically important atomic parameters are limited due to line blending, insufficient spectral resolution of some key spectral lines, and also the complicated electronic structure of …
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Mechanoluminescence and Sonoluminescence From Acoustic Cavitation
… resulted in intense carbon-containing molecular emission lines in the SBSL spectrum. The spectral profile of the molecular emission lines was found to be dependent on concentration of the organic and the applied acoustic pressure. At low concentration, the molecular emission bands showed a …
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The Importance of Photoevaporation in the Evolution of Protoplanetary Discs
… appear in observations of atomic forbidden emission lines and so how both line profiles and spatially resolved emission may be used to constrain the wind's nature; c) by including photoevaporation in models of disc evolution on secular timescales that predict its interplay with other …
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Black Hole Astrophysics : Magnetohydrodynamics on the Kerr Geometry
… from accretion disks. Relativistically broadened emission lines from active galactic nuclei and X-ray binaries are calculated by relativistic ray tracing. A new model - based on truncated standard disks - is presented that considers radial drift in accretion flows. Emission lines serve as …
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The Interstellar Medium Along The Life of Sight Toward X Per
… the radio data are ('12)CO and ('13)CO J = 1-0 emission lines.
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Low resolution ultra-violet spectra of symbiotic stars. Developments over thirteen years
… of flux intensities of selected high energy emission lines from them. Unexpected chronological con-elation of the behaviour of these ratios is noted with respect to two symbiotic stars, it is believed that this correlation has not previously been reported
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Gain effect waveguide optical amplifiers for Si microphotonics
… stable BCC crystal phase has PL emission lines at 1537 nm and 1550 nm, and metastable FCC and HCP crystal phases result in PL emission lines at 1542 nm and 1533 nm. Upconversion coefficient measurements on the BCC phase and 7 ms lifetime metastable phase gave values of 10⁻¹⁷ and …
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Spectroscopic and photometric observations and analysis of compact binaries
… three objects and particularly to measure the emission lines parameters and to determine the radial velocities of the systems. For 2SXPS J062339.9− 265751, spectroscopy was undertaken using the SAAO 1.9 metre telescope. In addition, time series high speed photometry, over many epochs, was also …
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The evolution of star-forming galaxies : analysis of infrared observations by AKARI
… Various properties are deduced from the atomic emission lines detected, and star-forming spectral energy distribution templates are fitted to these sources using the multi-wavelength data available. The majority of these galaxies are dominated by emission from star formation, and local sources …
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VUV laser-induced plasma spectroscopy for low level sulphur detection in steel
… including sulphur in that the strongest resonant emission lines from these elements lie in the VUV part of the spectrum. In this thesis, the VUV region of the spectrum has been exploited using a spatially-resolved approach which has proved to be superior to the more conventional time-resolved …
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Sample and counting variations associated with x-ray flourescence [sic] analysis
… can be analyzed by measuring the intensity of emission lines sent out after rays strike the mixture, However, variations in the measurement of intensity do occur and are discussed in this paper. Counting error, or the inability to duplicate the exact number of radiation counts from sample to …
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The Inner Gaseous Disks Of Herbig Be Stars
… HD 21669, reasonable matches were found for all emission line profiles considered individually; however, for each star, no disk density model based on a single power law for the equatorial density was able to simultaneously fit all of the observed emission lines in the spectrum. For BD+65 1637, …
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Precision X-ray spectroscopy of 3C 273 jet knots
… Using these spectra we searched for narrow emission line candidates and, based on significance values calculated for the observed photon counts in each bin of the spectrum of the entire jet, we selected three possible emission candidates and attempted to match these with known highly …
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Optical remote sensing of thermospheric emission with the Sky-Calibrated Imaging Photometer
Optical remote sensing of emission lines is a well-established approach to estimating atmospheric parameters. The neutral oxygen 844.6 nm emission line has long been considered a good candidate for estimating the oxygen density in the upper thermosphere due to its brightness and relatively simple …
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On understanding the lives of dead stars : Supernova Remnant N103B, radio pulsar B1951+32, and the Rabbit
… 116ks of data, reveals unambiguous Mg, Ne, and O emission lines. Due to the elemental abundances, we are able to tentatively reject suggestions that N103B arose from a Type Ia supernova, in favor of the massive progenitor, core-collapse hypothesis indicated by earlier radio and optical studies, …
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Broad Band Excitation of Rare-Earth Dopants in Chalcogenide Glasses
… which efficiently excite a number of rare earth emission lines. This effect is attributed to the absorption of excitation light by the host glass with the subsequent transfer of energy to the rare earth dopants, mediated by defect states in the glass. Studies on the effect of changing the rare …
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Broad excitation of rare earth dopants in chalcogenide glasses
… which efficiently excite a number of rare earth emission lines. This effect is attributed to the absorption of excitation light by the host glass with the subsequent transfer of energy to the rare earth dopants, mediated by defect states in the glass. Studies on the effect of changing the rare …
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