منابع مشابه
Identifying high redshift AGNs from X-ray colors
The X-ray color (hardness ratio) of optically undetected X-ray sources can be used to distinguish obscured active galactic nuclei (AGNs) at low and intermediate redshift from viable high-redshift (i.e., z > 5) AGN candidates, and thus to better determine the space density, ionizing photon production, and X-ray background contribution of the earliest detectable AGNs. High redshift AGNs should ap...
متن کاملLuminance contours can gate afterimage colors and "real" colors.
It has long been known that colored images may elicit afterimages in complementary colors. We have already shown (Van Lier, Vergeer, & Anstis, 2009) that one and the same adapting image may result in different afterimage colors, depending on the test contours presented after the colored image. The color of the afterimage depends on two adapting colors, those both inside and outside the test. He...
متن کاملWatermarking Spot Colors Osama
Watermarking of printed materials has usually focused on process inks of cyan, magenta, yellow and black (CMYK). In packaging, almost three out of four printed materials include spot colors. Spot colors are special premixed inks, which can be produced in a vibrant range of colors, often outside the CMYK color gamut. In embedding a watermark into printed material, a common approach is to modify ...
متن کاملThe Poetry of Colors
Bruce Thacker never took an art class. He never even took a computer class. His degree is in geology, and he fi rst bought a computer in 1990 to track stock investments. Somewhere in the convoluted melange of his linear history, he owned a contemporary art gallery, invested in stocks and real estate, owned a custom photo lab, and was a professional photographer. “Other things that I’ve never ha...
متن کاملTiles and Colors
Tiling models are classical statistical models in which different geometric shapes, the tiles, are packed together such that they cover space completely. In this paper we discuss a class of two-dimensional tiling models in which the tiles are rectangles and isosceles triangles. Some of these models have been solved recently by means of Bethe Ansatz. We discuss the question why only these models...
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ژورنال
عنوان ژورنال: Journal of Chemical Education
سال: 1973
ISSN: 0021-9584,1938-1328
DOI: 10.1021/ed050p797.3