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Showing 1 to 20 of 56 for “"spectral line"”.
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Automation of the Spectral-Line Imaging Camera for the Virginia Tech Spectral-Line Survey
The Virginia Tech Spectral-Line Survey (VTSS) is a high sensitivity, high resolution survey of Hydrogen-$\alpha$ and Sulfur-II emission in the full northern hemisphere. The instrument used for the survey is the Spectral Line Imaging Camera (SLIC). SLIC uses a fast(f/1.2) lens attached to a …
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Theories of Translational - Vibrational Energy Transfer and Rotational Spectral Line Broadening
Made available in DSpace on 2014-12-10T23:01:20Z (GMT). No. of bitstreams: 1 7219804.pdf: 3502637 bytes, checksum: 56b94330a5e6c1f036a0f6f7b1e0a0ea (MD5) Previous issue date: 1972
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3 Mm Spectral Line Surveys of the High Mass Star Forming Regions Sagittarius B2(N -Lmh) and Orion -Kl
… the analysis of the data from the Sgr B2(N-LMH) line survey, where most large, saturated molecular species were constrained to a very small region in the cloud, with the exception of a single transition of C2H5OH which is found to be widespread. The fourth chapter gives the initial survey results …
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An Arcminute-Resolution Imaging Study of the H-alpha & [S II] Emission of the ISM from the Local Perseus Arm Using the Virginia Tech Spectral-Line Survey
The Virginia Tech Spectral-Line Survey (VTSS) is a series of 10-degree wide, arcminute-resolution images of the warm ionized interstellar medium (WIM) within the Milky Way for declinations greater than -15 degrees. The Wisconsin Hydrogen-Alpha Mapper (WHAM) studies the kinematics and distribution …
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Digital analysis of narrow band imagery of the Cygnus loop
… is presented. Calibrated surface brightness 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 …
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Identification of chemical species using artificial intelligence to interpret optical emission spectra
The nonlinear modeling capabilities of artificial neural networks (ANN’s) are renowned in the field of artificial intelligence (Al) for capturing knowledge that can be very difficult to understand otherwise. Their ability to be trained on representative data within a particular problem domain and …
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Investigation of Planar Channeling Radiation on Diamond and Quartz Crystals at Electron Energies between 14 and 34 MeV and Probing the Influence of Ultrasonic Waves on Channeling Radiation
… research was the optimization of its yield and spectral line width as well. Since diamond single crystals have been found to probably be the most suitable ones for an intense CR production because of their outstanding properties to withstand rather high average electron currents, a first …
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Dirac R-matrix scattering calculations in support of plasma diagnostics
… provide great insight for plasma diagnostics and spectral line identification.<br/><br/><br/>
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Coronal properties of pre-main sequence stars in the Orion Trapezium Cluster
… elemental abundances from individual spectral line fits, determined common elemental abundances to refit the data, and computed confidence maps for pairs of model parameters. These results may provide insights into the physical properties and processes that cause certain stars to …
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Atomic absorption spectrometry and its application in geochemistry
… the various phenomena such as atomic population, spectral line shapes, factors influencing absorption, analytical graph curvature, etc.are deduced. The practical aspects of atomic absorption are discussed with respect to: Instrumentation: flame studies and an attempt to develop "a universal" …
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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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High resolution spectroscopy of photospheric bright points
… of the influence of the speckle deconvolution on spectral line profiles. In this thesis, the results of such an analysis are presented, followed by a conclusion that speckle-reconstructed spectral line profiles can be used for quantitative spectroscopy. <br> <br> The data set presented in this …
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A Millimeter Wavelength Interferometric Study of Organic Molecules in Comet Hale -Bopp (C/1995 O1)
… wavelength interferometric maps of comet spectral line emission have been made for the first time, proving the concept that comets can be successfully observed with the BIMA Array. (3) A new technique, the ""difference map"", has been developed for analyzing high resolution images. This …
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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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Partially ionized plasma transport and line radiation interactions as the tokamak edge
Hydrogenic resonance line radiation interacts with the high-density low-temperature plasma at the tokamak edge. As a result, there exists a significant nonlocal plasma energy transport channel, local atomic level populations are altered by global plasma properties, and plasma transport is affected. …
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Investigation of renormalization effects in high temperature cuprate superconductors
… itself evident even in the shape of a single spectral line measured for a fixed momentum. It was shown that for the Bi-2212 samples substitution of Cu atoms in Cu-O plane changes renormalization features in ARPES spectra both in nodal and antinodal parts of the Brillouin zone. The smearing of …
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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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A technique for astronomical spectroscopy with a multi-aperture telescope
A technique for acquiring spectral line data using a multi-aperture telescope is described. The multi-aperture principle and the criteria which led to the selection of a dispersive spectrometer are discussed. The problem of linking telescope and spectrometer has been solved by incorporating low …
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Gewinngeschaltete Ti:Saphir-Laser mit ultrabreitem Abstimmbereich
… tunable solid-state lasers in the near infrared spectral region. Since the beginning of the new millennium the performance of tunable Ti:Sapphire lasers has gained a significant technology push by the steady increase of output power of commercially available pump lasers and by the progress in the …
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Multi slot amplitude coding technique for high speed optical fiber communication system
… devices and DCDM suffers from increased spectral width when the number of tributary increased. Therefore, in this research, a new multiplexing technique is proposed, known as Multi Slot Amplitude Coding (MSAC). In this technique, three, four and five tributaries can be achieved with less …
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