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luminosity

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Journal Article
Published: 01 May 2002
Journal of Sedimentary Research (2002) 72 (3): 408-415.
... attached to a scanning electron microscope (SEM). SEM/CL images taken through these filters were captured digitally and transferred to a computer. Luminescence intensities (luminosities) of the images were measured by using available commercial software. Measured luminosities of these CL images...
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Mean normalized total <b>luminosity</b> versus mean relative <b>luminosity</b> of CL imag...
Published: 01 May 2002
Figure 7 Mean normalized total luminosity versus mean relative luminosity of CL images acquired through the blue filter. Total luminosity is normalized to 100 percent by dividing measured total luminosity values by 255, the maximum luminosity displayed in Photoshop.
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Mean normalized total <b>luminosity</b> versus mean relative <b>luminosity</b> of CL imag...
Published: 01 May 2002
Figure 8 Mean normalized total luminosity versus mean relative luminosity of CL images acquired through the red filter. Total luminosity is normalized to 100 percent by dividing measured total luminosity values by 255, the maximum luminosity displayed in Photoshop.
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Mean normalized total <b>luminosity</b> versus mean relative <b>luminosity</b> of CL imag...
Published: 01 May 2002
Figure 9 Mean normalized total luminosity versus mean relative luminosity of CL images generated by emission in the UV. Relative UV luminosity is calculated by normalizing UV, red, green, blue luminosity to 100 percent.
Journal Article
Published: 01 January 2005
American Mineralogist (2005) 90 (1): 122-131.
...Marianne R. Landtwing; Thomas Pettke Abstract Laser-ablation ICP-MS data of hydrothermal vein quartz with zonation in scanning electron microscope cathodoluminescence reveal two groups of trace elements, one that co-varies in concentration with luminosity and another that remains uniform throughout...
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Journal Article
Journal: Geology
Published: 01 July 2014
Geology (2014) 42 (7): 627-630.
..., despite continually increasing solar luminosity. To assess the relative roles of continental configuration and atmospheric p CO 2 on the formation of continental-scale ice sheets, we use a coupled ice sheet–climate model to simulate ice sheet initiation at eight different Paleozoic time slices using...
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The Sun’s <b>luminosity</b> as a function of time as calculated by astrophysicists...
Published: 01 October 2018
Figure 2.4 The Sun’s luminosity as a function of time as calculated by astrophysicists. The presence of water as early as three billion years ago requires that greenhouse warming was far larger than today’s.
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(a) The <b>luminosity</b> (lightness) axis for     hue  =  0     (red) and     sat...
Published: 21 January 2015
Figure A-2. (a) The luminosity (lightness) axis for hue = 0 (red) and saturation = 240 . Colors range from white, through pink, pure red, brick red, to black. (b) The saturation axis for hue = 0 (red) and luminosity ( ( lightness ) = 120 . Colors range from
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Diagram illustrating the method of measuring CL <b>luminosity</b>.  A)  A CL image...
Published: 01 May 2002
Figure 2 Diagram illustrating the method of measuring CL luminosity. A) A CL image of a volcanic quartz grain (Bishop Tuff) showing the area of measurement selected by the lasso tool. B) The luminosity histogram displayed in Photoshop and the corresponding statistical values of the histogram
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Mean relative <b>luminosity</b> of CL images of volcanic quartz phenocrysts acquir...
Published: 01 May 2002
Figure 3 Mean relative luminosity of CL images of volcanic quartz phenocrysts acquired through red, green, and blue filters. Some of the closely clustered data points fall on top of others. Relative luminosity is calculated by normalizing red, green, blue luminosity values to 100 percent.
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Mean relative <b>luminosity</b> of CL images of plutonic quartz acquired through r...
Published: 01 May 2002
Figure 4 Mean relative luminosity of CL images of plutonic quartz acquired through red, green, and blue filters. Relative luminosity is calculated by normalizing red, green, blue luminosity values to 100 percent.
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Mean relative <b>luminosity</b> of CL images of metamorphic quartz acquired throug...
Published: 01 May 2002
Figure 5 Mean relative luminosity of CL images of metamorphic quartz acquired through red, green, and blue filters. Relative luminosity is calculated by normalizing red, green, blue luminosity values to 100 percent.
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Mean relative <b>luminosity</b> of CL images of hydrothermal (vein) quartz acquire...
Published: 01 May 2002
Figure 6 Mean relative luminosity of CL images of hydrothermal (vein) quartz acquired through red, green, and blue filters. Relative luminosity is calculated by normalizing red, green, blue luminosity values to 100 percent.
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Observed X-ray <b>luminosities</b> L X  relative to the present sun vs. stellar ag...
Published: 01 January 2002
Figure 10. Observed X-ray luminosities L X relative to the present sun vs. stellar ages for “weak-lined” T-Tauri stars (WTTS) and solar-type main sequence stars (MSS) ( Pepin 1991 ). All WTTS data are from Walter et al. (1988) , MSS data from Simon et al. (1985) and Walter and Barry (1990
Journal Article
Journal: Geology
Published: 01 June 1992
Geology (1992) 20 (6): 507-510.
...Thomas J. Crowley; Steven K. Baum Abstract Late Paleozoic glaciation on Gondwana is associated with changes in geography, solar luminosity, and estimated CO 2 levels. To assess the relative importance of these boundary conditions, we conducted a suite of climate model simulations for the periods...
Journal Article
Journal: GSA Bulletin
Published: 01 March 1965
GSA Bulletin (1965) 76 (3): 287-306.
...WILLIAM L DONN; BERTRAM D DONN; WILBUR G VALENTINE Abstract According to current astrophysical models of the sun, solar luminosity has increased with time at a rate depending on the nature of the model and the “zero-age” of the sun. The determination of the earliest occurrence of running water...
Journal Article
Published: 01 October 2018
Geochemical Perspectives (2018) 7 (2): 117.
... compelling evidence that this green-house gas played a key role throughout the Earth’s history. It certainly compensated for the young Sun’s lower luminosity. There is no question that it bailed us out of two snowball episodes or that it led to a brief 5 °C warming at the onset of the Eocene. Less certain...
Journal Article
Journal: Geology
Published: 12 December 2017
Geology (2018) 46 (2): 139-142.
...Mingyu Zhao; Christopher T. Reinhard; Noah Planavsky Abstract High concentrations of the greenhouse gases CO 2 and CH 4 have long been invoked to explain a largely ice-free climate despite lower solar luminosity during the Precambrian. However, recently a “methane paradox” has emerged, whereby...
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Series: GSA Special Papers
Published: 01 May 2014
DOI: 10.1130/2014.2504(09)
... effect necessary to compensate for the young Sun's lower luminosity. (10) The Archean pH values were 4.0–4.5 for rainwater, between 4.5 and 6.0 for river water, and 7.0 ± 0.5 for ocean water. The oceans were saturated with calcite but under-saturated with siderite. (11) The δ 18 O of Archean oceans...
Journal Article
Published: 01 July 2012
Journal of Foraminiferal Research (2012) 42 (3): 245-256.
... and the Parvalamellinae not only reveals the important systematic value of the coiling mode and laminar extensions in classification of the Involutinina but also the potential role of luminosity in the development of the suborder. 3 Correspondence author. E-mail: Sylvain.Rigaud@unige.ch 13 10 2011 30 04...
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