967 resultados para Florist and Nursery Crops Laboratory (U.S.)
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Mode of access: Internet.
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S/N 001-000-04478-8
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Mode of access: Internet.
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Mode of access: Internet.
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Since OSIRIS started acquiring high-resolution observations of the surface of the nucleus of comet 67P/Churyumov-Gerasimenko, over one hundred meter-sized bright spots have been identified in numerous types of geomorphologic regions, but mostly located in areas receiving low insolation. The bright spots are either clustered, in debris fields close to decameter-high cliffs, or isolated without structural relation to the surrounding terrain. They can be up to ten times brighter than the average surface of the comet at visible wavelengths and display a significantly bluer spectrum. They do not exhibit significant changes over a period of a few weeks. All these observations are consistent with exposure of water ice at the surface of boulders produced by dislocation of the weakly consolidated layers that cover large areas of the nucleus. Laboratory experiments show that under simulated comet surface conditions, analog samples acquire a vertical stratification with an uppermost porous mantle of refractory dust overlaying a layer of hard ice formed by recondensation or sintering under the insulating dust mantle. The evolution of the visible spectrophotometric properties of samples during sublimation is consistent with the contrasts of brightness and color seen at the surface of the nucleus. Clustered bright spots are formed by the collapse of overhangs that is triggered by mass wasting of deeper layers. Isolated spots might be the result of the emission of boulders at low velocity that are redepositioned in other regions.
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A. J. Jordan, architect. Built in 1856. First chemical laboratory at a state university. Building served medical students and others as both laboratory and classroom. Situated just west and south of the original medical building. Additions made to the one-story building in 1861, 1866, 1868, 1874. In 1880 a two-story addition was added with subsequent additions in 1889 and 1901. Became Economics Building in 1908. Pharmacology occupied north wing 1908-1981. Destroyed by fire Christmas Eve 1981. Two people in the image
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Photograph of drawing by Benno Rohnert. On verso: "Center- First Engineering Bldg. Brick & frame 1881-82. Right-Abandoned campus carpenter shop moved against west side 1883 and used for wood shop. Left-First unit of 3 story brick building started 1885" Original two buildings removed in 1888.
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Includes bibliographies.
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Prepared under the supervision of Z.R. Pettet.
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Mode of access: Internet.
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Mimeographed.
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Literature cited: p. 90-93.
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Literature cited: p. 124 -125.
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Literature cited: p. 238-256.