Arago in a sentence

Arago later noted that the diffraction bright spot (which later became known as both the Arago spot and the Poisson spot) had already been observed by Joseph-Nicolas Delisle and Giacomo F. Maraldi citation a century earlier.

Arago spot with matter waves Recently, the Arago spot experiment was demonstrated with a supersonic expansion beam of deuterium molecules (an example of neutral matter waves ).

Politics and legacy One of the 135 Arago medallions set along the Paris Meridian for convert, in memorial to Arago and his work on the meridian and his measurements of the Earth.

Arago Twp. owed $39,461 on a general obligation bond.

After trying to conquer the world, the Demon Sovereign Arago was banished to the Nether World by Chaos.

Razor clamming is now open from the Columbia River to Cape Perpetua (Lincoln County) and from the south jetty of the Umpqua River (Lane County) to Cape Arago.

Among Arago's many contributions to the support of the undulatory hypothesis, comes the experimentum crucis which he proposed to carry out for measuring directly the velocity of light in air and in water and glass.

An Arago spot of electrons, which also constitute matter waves, can be observed in transmission electron microscopes when examining circular structures of a certain size.

An image of the stamp is available at Arago online at the link in the footnote.

Arago continued the work until 1809, his purpose being to measure a meridian arc in order to determine the exact length of a metre.

Arago is also fairly entitled to be regarded as having proved the long-suspected connexion between the aurora borealis and the variations of the magnetic elements.

Arago threw himself into its service, and by his faculty of making friends he gained at once for it and for himself a worldwide reputation.

Arago was the eldest of four brothers.

As a result of this work, Arago constructed a polariscope, which he used for some interesting observations on the polarization of the light of the sky.

At the beginning of May 1852, when the government of Louis Napoleon required an oath of allegiance from all its functionaries, Arago peremptorily refused, and sent in his resignation of his post as astronomer at the Bureau des Longitudes.

Deviation from circularity If the cross-section of the circular object deviates slightly from its circular shape (but it still has a sharp edge on a smaller scale) the shape of the point-source Arago spot changes.

Finite source size and spatial coherence The main reason why the Arago spot is hard to observe in circular shadows from conventional light sources is that such light sources are bad approximations of point sources.

Furthermore, this means that the Arago spot is present even just a few obstacle diameters behind the disc.

Haimann, Alexander T., "2-cent Landing of Columbus", Arago: people, postage & the post, National Postal Museum online, viewed 18 April 2014.

His work was heavily influenced by the ongoing research of fellow European scientists Ampere, Arago, and Oersted as indicated by his diary entries.