Results 11 to 20 of about 5,187,702 (267)

Spectral Domain Low- Coherence Interferometry for On-line Surface Inspection [PDF]

open access: yes, 2013
We present an on-line surface measurement technique based on spectral domain low-coherence interferometry (SD-LCI), which can obtain a one dimensional surface profile with just one shot.
Gao, F., Jiang, Xiang, Tang, Dawei
core   +4 more sources

Spectral Line Depth Variability in Radial Velocity Spectra [PDF]

open access: yes, 2022
Stellar active regions, including spots and faculae, can create radial velocity (RV) signals that interfere with the detection and mass measurements of low mass exoplanets.
Plavchan, Peter   +5 more
core   +1 more source

Theory and assessment of an improved power spectral density estimator [PDF]

open access: yes, 1990
This thesis is concerned with the processing of time domain signals received by a single sensor. An example of such signals is the radar return, which is used in one way or another to estimate the power spectral density a frequency representation of ...
Ali, Ali Abbas
core   +7 more sources

An upper limit for water dimer absorption in the 750 nm spectral region and a revised water line list [PDF]

open access: yesAtmospheric Chemistry and Physics, 2010
Abstract. Absorption of solar radiation by water dimer molecules in the Earth's atmosphere has the potential to act as a positive feedback effect for climate change. There seems little doubt from the results of previous laboratory and theoretical studies that significant concentrations of the water dimer should be present in the atmosphere, yet ...
Shillings, A.J.L.   +4 more
openaire   +4 more sources

Revisiting ϵ Eridani with NEID: Identifying New Activity-sensitive Lines in a Young K Dwarf Star

open access: yesThe Astronomical Journal, 2023
Recent improvements in the sensitivity and precision of the radial velocity (RV) method for exoplanets have brought it close, but not quite to, the threshold (∼10 cm s ^−1 ) required to detect Earth-mass and other potentially habitable planets around Sun-
Sarah Jiang   +9 more
doaj   +1 more source

Spectral line lists of a nitrogen gas discharge for wavelength calibration in the range 4500–11 000 cm-1 [PDF]

open access: yesAstronomy & Astrophysics, 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.
A. Boesch, A. Reiners
openaire   +3 more sources

Spectral line-by-line pulse shaping of on-chip microresonator frequency combs [PDF]

open access: yes, 2011
Recently, on-chip comb generation methods based on nonlinear optical modulation in ultrahigh-quality-factor monolithic microresonators have been demonstrated, where two pump photons are transformed into sideband photons in a four-wave-mixing process ...
Lei Chen   +15 more
core   +1 more source

The Optical Spectral Line List of RR Telescopii

open access: yesThe Astrophysical Journal Supplement Series, 1997
The symbiotic nova RR Telescopii has been observed with the 1.5 m telescope of the Cerro Tololo Inter-American Observatory (CTIO), using the 1.5 m bench-mounted echelle spectrograph in conjunction with a Tektronix CCD. It displays a rich emission-line spectrum, ranging in excitation from O I to [Ni VIII].
F. C. McKenna   +6 more
openaire   +1 more source

An Updated Line List for NUV Spectral Synthesis in Evolved Stars: Redetermination of the Beryllium Abundance in the Solar Photosphere [PDF]

open access: yesThe Astrophysical Journal, 2018
Abstract Motivated by the desire to measure beryllium abundances in red giant stars, we have constructed a new line list for synthesizing spectra in the near-ultraviolet. Using the Sun, Arcturus, and Pollux as benchmark stars, we explore potential sources of missing continuous opacity and line absorption.
Joleen K. Carlberg   +3 more
openaire   +1 more source

Reading lists - how do you eat yours? [PDF]

open access: yes, 2004
Report of a CELT project on supporting students through innovation and researchStudents at the University of Wolverhampton Business School (UWBS are given reading lists as part of their guides for each module. Learning Centre staff at Compton and Telford
Thompson, Lisa   +2 more
core   +3 more sources

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