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 21 for “"Echelle"”.
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The Interstellar Medium Along The Life of Sight Toward X Per
… satellite, the optical data are primarily blue echelle spectra, and the radio data are ('12)CO and ('13)CO J = 1-0 emission lines.
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Le questionnaire sur l'éducation à la carrière: validation pour les élèves francophones du Nouveau-Brunswick
… scolaire et professionnelle reflete au sein de l'Echelle III "Connaissance des professions et du marche du travail" que leurs pairs n'ayant pas ete selectionnes. Enfin, l'influence de la variable sexe s'est fait sentir surtout au niveau des croyances concernant le travail et des attitudes de …
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Evaluation of the theta pinch as a sampling and excitation source for elemental analysis of solid refractory materials
… pressure, and sample positioning. A dual grating Echelle spectrometer with charge coupled device detection was constructed and characterized for obtaining spectroscopic data, and is discussed in detail.
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Spectral modelling of molecular nitrogen in Aurora
… with the HiTIES (High Throughput Imaging Echelle Spectrograph) at the Nordlysstasjonen in Svalbard, Norway (78.2025N and 15.829E). The filter provides images of the resonant scattered spectra of N+2 1N (0,1), (1,2), (2,3) bands and a neutral N2 2P (0,3) band. Ab initio models were created …
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Analyse hochaufgelöster spektroskopischer Zeitserien der Wolf-Rayet-Doppelsternsysteme [Gamma] 2 Velorum, WR 22 und HD 5980
In den Jahren 1995 bis 1999 konnten mit den Echelle-Spektrographen Heros und FEROS umfangreiche spektroskopische Zeitserien dreier Wolf-Rayet-Doppelsternsysteme (gamma2 Velorum, WR 22 und HD 5980) gewonnen werden. Selbst für die langperiodischen Systeme gamma2 Velorum und WR 22 (P sim 80 Tage) …
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Some aspects of rapid analysis of coal slurries using direct current plasma emission spectrometry
… spectrometry. Emission lines accessible to the echelle grating of the DCP are not suitable for such analysis, so that the deep-UV lines from 180-183 nm must be utilized for such work. A relatively simple purge system with low argon consumption (5 L/min) is adequate for sulfur analysis, and the …
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Low Loss Integrated Photonic Devices and Their Applications in Astrophotonics and Quantum Information
… of an on-chip low-loss (1.39 dB on-chip loss) echelle grating spectrometer that can work in an ultra-broad band (potentially from visible to mid-infrared spectral range) with high resolution and low crosstalk (<-30dB). We demonstrate an on-chip add-drop filter working on arbitrarily spaced five …
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Observational Studies of Rare Quasar Outflows: the FeLoBALs
… of these objects using data from the Ultraviolet Echelle Spectrograph at the Very Large Telescope (VLT/UVES), we can determine several properties of these outflows, including the hydrogen number density $n_H$, the hydrogen column density $N_H$, and the hydrogen ionization parameter $U_H$. These …
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A Study of Quasar Outflows: Physical Characteristics and Feedback Effects
… from the Very Large Telescope (VLT) Ultraviolet Echelle Spectrograph (UVES) and the Hubble Space Telescope (HST) Space Telescope Imaging Spectrograph (STIS), we determined the physical parameters of the absorption outflows of five different quasars: including electron number density, Hydrogen …
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Experimental and theoretical investigations of molecular ions by spectroscopy as well as ion mobility and mass spectrometry
… resolutions in the range of commercial echelle spectrographs. The lowest full width at half maximum of a peak achieved was 25 pm. The 2D spectrograph is based on the wavelength separation of light by the combination of a prism and a grating in one dimension, and an etalon in the second …
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Modelling the balmer line profiles in the spectra of symbiotic stars
… which is a direct offshoot of the Manchester Echelle/European Southern Observatory High Resolution Spectroscopic Survey of symbiotic stars (see van Winckel et al., 1993; Ivison, Bode & Meaburn., 1994) We first provide a critique of previously developed, alternative Balmer line profile models …
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The HI Lyman-alpha opacity at redshift 2.7 < z < 3.6
… spectra observed with the Ultraviolet and Visual Echelle Spectrograph (UVES) at the Very Large Telescope (VLT). The redshift evolution of the effective optical depth, τ_eff(z), is measured in the redshift range 2.7≤z≤3.6. The influence of metal absorption features is removed by performing a …
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High resolution linear spectropolarimetry: a study of the potentiality in probing stellar atmospheres and circumstellar environments
… in addition to archive data taken with the \emph{Echelle SpectroPolarimtric Device for the Observation of Stars} (ESPaDOnS). We found the existence of linear polarisation in the metal lines in absorption and in some of the metal lines in emission: this is the first \emph{Second Solar Spectrum} …
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Probe arm motion techniques for miradas multi-object spectrograph
… Spectrograph (MIRADAS) es un espectrógrafo Echelle multi-objeto en el infrarrojo cercano para el Gran Telescopio Canarias (GTC) diseñado por un consorcio internacional. Gracias a su potente resolución y a su capacidad de multiplexación, este instrumento será clave para abordar algunos de los …
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