Results 51 to 60 of about 1,455,401 (342)
On line spectral frequencies [PDF]
IEEE Signal Processing Letters, 2003 The commonly used line spectral frequencies form the roots of symmetric and antisymmetric polynomials constructed from a linear predictor. We provide a new, simpler proof that the symmetric and antisymmetric polynomials can be regarded as optimal constrained predictors that correspond to predicting from the low-pass and high-pass filtered signal ...
Tom Bäckström, W.B. Kleijn, Paavo Alku
openaire +2 more sources
Руды и металлыBased on the study of rutile and cassiterite grains, using Fourier transform infrared microscopy, a new method for their determination in heavy mineral concentrate samples has been developed.
Khachatryan G. K., Anashkina N. E.
doaj +1 more source
Spectral line lists of a nitrogen gas discharge for wavelength calibration in the range $4500-11000$cm$^{-1}$ [PDF]
A&A 582, A43 (2015), 2015 A discharge of nitrogen gas, as created in a microwave-induced plasma, exhibits a very dense molecular emission line spectrum. Emission spectra of this kind could serve as wavelength calibrators for high-resolution astrophysical spectrographs in the near-infrared, where only very few calibration sources are currently available.
arxiv +1 more source
Special Issue on Spectral Line Shapes in Plasmas
Atoms, 2014 Line-shape analysis is one of the most important tools for diagnostics of both laboratory and space plasmas. Its reliable implementation requires sufficiently accurate calculations, which imply the use of analytic methods and computer codes of varying ...
Evgeny Stambulchik +3 more
doaj +1 more source
On line contribution functions and examining spectral line formation in 3D model stellar atmospheres [PDF]
MNRAS (September 11, 2015) 452 (2): 1612-1616, 2015 Line contribution functions are useful diagnostics for studying spectral line formation in stellar atmospheres. I derive an expression for the contribution function to the abso- lute flux depression that emerges from three-dimensional box-in-a-star model stellar atmospheres. I illustrate the result by comparing the local thermodynamic equilibrium (LTE)
arxiv +1 more source
Infrared Spectroscopy of RNA Nucleosides in a Wide Range of Temperatures
LifeThe RNA world hypothesis suggests that early cellular ancestors relied solely on RNA molecules for both genetic information storage and cellular functions.
Susana Iglesias-Groth +2 more
doaj +1 more source
A Process for On-Line Spectral Analysis
Measurement + Control, 1969 As a modest contribution to the development of more problem-oriented control solutions, a simple on-line spectral-analysis process is presented and some of its possible applications discussed.
E. Moseley MSc, CEng, MIEE
doaj +1 more source
Journal of Applied Clinical Medical Physics, Volume 23, Issue 12, December 2022., 2022 Abstract Purpose MRI is increasingly used for brain and head and neck radiotherapy treatment planning due to its superior soft tissue contrast. Flexible array coils can be arranged to encompass treatment immobilization devices, which do not fit in diagnostic head/neck coils. Selecting a flexible coil arrangement to replace a diagnostic coil should rely
Evangelia Kaza +6 more
wiley +1 more source
Long-Term X-ray Spectral Variability in Seyfert 1 Galaxies
, 2003 Direct time-resolved spectral fitting has been performed on continuous RXTE monitoring of seven Seyfert 1 galaxies in order to study their broadband spectral variability and Fe K alpha variability characteristics on time scales of days to years ...
A. Markowitz +11 more
core +1 more source
F, G, K, M Spectral Standards in the Y Band (0.95-1.11 um) [PDF]
, 2010 We take advantage of good atmospheric transparency and the availability of high quality instrumentation in the 1 um near-infrared atmospheric window to present a grid of F, G, K, and M spectral standards observed at high spectral resolution (R ~ 25,000).
Chelsea Sharon +17 more
core +2 more sources