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4th-century sarcophagus, Milan; one of the earliest Nativity images. The earliest representations of the Nativity itself are very simple, just showing the infant, tightly wrapped, lying near the ground in a trough or wicker basket. The ox and ass are always present, even when Mary or any other human is not.
where m is the Bragg order (a positive integer), λ B the diffracted wavelength, Λ the fringe spacing of the grating, θ the angle between the incident beam and the normal (N) of the entrance surface and φ the angle between the normal and the grating vector (K G). Radiation that does not match Bragg's law will pass through the VBG undiffracted.
This image is a derivative work of the following images: File:Loi_de_bragg.png licensed with Cc-by-sa-3.0-migrated, GFDL 2004-12-24T11:00:38Z Cdang 676x299 (12517 Bytes) Loi de Bragg : le déphasage cause des interférences constructrices (image de gauche) ou destructrices (image de droite) - Bragg's law: the phase shift causes constructive ...
Nativity scenes around the world have added a new accessory this Christmas season: the keffiyeh. In a controversial take on the classic holiday display, some churches are replacing the baby Jesus ...
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A Nativity play or Christmas pageant is a play which recounts the story of the Nativity of Jesus. It is usually performed at Christmas , the feast of the Nativity. For the Christian celebration of Christmas, the viewing of the Nativity play is one of the oldest Christmastime traditions, with the first reenactment of the Nativity of Jesus taking ...
Portrait of William Lawrence Bragg taken when he was around 40 years old. Sir William Lawrence Bragg (31 March 1890 – 1 July 1971), known as Lawrence Bragg, was an Australian-born British physicist and X-ray crystallographer, discoverer (1912) of Bragg's law of X-ray diffraction, which is basic for the determination of crystal structure.
The Christmas chaos unfolded outside Macy’s on 34th Street and Sixth Avenue shortly after 4 p.m. when the northbound-traveling driver, 58, jumped a curb at the busy intersection, cops and ...