Results 41 to 50 of about 142,219 (211)
A cross-calibration between Tycho-2 photometry and HST spectrophotometry [PDF]
, 2005 I show that Tycho-2 photometry and HST spectrophotometry are accurate and stable enough to obtain a precise cross-calibration by analyzing a well-calibrated sample of 256 stars observed with both Hipparcos and HST. Based on this analysis, I obtain the following photometric zero points in the Vega magnitude system for Tycho-2: 0.020+-0.001 (B_T-V_T), 0 ...
arxiv +1 more source
Precision spectrophotometry for PNLF distances: the case of NGC 300 [PDF]
arXiv, 2023 The Multi-Unit Spectroscopic Explorer (MUSE) has enabled a renaissance of the planetary nebula luminosity function (PNLF) as a standard candle. In the case of NGC 300, we learned that the precise spectrophotometry of MUSE was crucial to obtain an accurate PNLF distance.
arxiv
Spectrophotometry of shell galaxies [PDF]
The Astrophysical Journal, 1986 Low dispersion spectra of two shell galaxies, NGC 3923 and NGC 3051, have been obtained covering the 5300Å to 10000Å spectral range. These long-slit spectra go through the nucleus of each galaxy and also through 12 shells in NGC 3923 and through 3 shells in NGC 3051.
openaire +2 more sources
Shedding light on spectrophotometry: The SpecUP educational spectrophotometer
South African Journal of Science, 2014 Students often regard laboratory instruments as ‘black boxes’ which generate results, without understanding their principles of operation. This lack of understanding is a concern because the correct interpretation of analytical results and the ...
Patricia B.C. Forbes, Johan A. Nöthling
doaj +1 more source
Spectrophotometry of thin films of light absorbing particles [PDF]
, 2017 Thin films of dispersions of light absorbing solid particles or emulsions containing a light absorbing solute all have a non-uniform distribution of light absorbing species throughout the sample volume.
Binks, Bernard P. +5 more
core +2 more sources
Nitrogen Concentration Estimation in Tomato Leaves by VIS-NIR Non-Destructive Spectroscopy
Sensors, 2011 Nitrogen concentration in plants is normally determined by expensive and time consuming chemical analyses. As an alternative, chlorophyll meter readings and N-NO3 concentration determination in petiole sap were proposed, but these assays are not always ...
Paolo Menesatti +10 more
doaj +1 more source
A recalibration of optical photometry: Tycho-2, Strömgren, and Johnson systems [PDF]
Astron.J.131:1184-1199,2006, 2005 I use HST spectrophotometry to analyze the calibration of 3 optical photometry systems: Tycho-2 B_T V_T, Str\"omgren u v b y, and Johnson U B V. For Tycho-2, I revisit the analysis of Ma\'iz Apell\'aniz (2005) to include the new recalibration of grating/aperture corrections, vignetting, and charge transfer inefficiency effects produced by the STIS ...
arxiv +1 more source
Carded Tow Real-Time Color Assessment: A Spectral Camera-Based System
Sensors, 2016 One of the most important parameters to be controlled during the production of textile yarns obtained by mixing pre-colored fibers, is the color correspondence between the manufactured yarn and a given reference, usually provided by a designer or a ...
Rocco Furferi +3 more
doaj +1 more source
Archives of Plastic Surgery, 2017 Background The effect of liposuction on the perforators of the lower abdominal wall has been investigated in several studies. There are controversial results in the literature that have primarily demonstrated the number and patency of the perforators ...
Zeynep Deniz Akdeniz Doğan +5 more
doaj +1 more source
Effect of aging on color stability of amine-free resin cement through the ceramic laminate veneer
Dental Research Journal, 2021 Background: This study aimed to assess the color change of two amine-free dual-cure resin cements following aging in comparison with a light-cure resin cement.
Keyvan Saati +3 more
doaj +1 more source