On the Electric Breakdown in Liquid Argon at Centimeter Scale

We present a study on the dependence of electric breakdown discharge properties on electrode geometry and the breakdown field in liquid argon near its boiling point. The measurements were performed with a spherical cathode and a planar anode at distances ranging from 0.1 mm to 10.0 mm. A detailed study of the time evolution of the breakdown volt-ampere characteristics was performed for the first time. It revealed a slow streamer development phase in the discharge. The results of a spectroscopic study of the visible light emission of the breakdowns complement the measurements. The light emission from the initial phase of the discharge is attributed to electro-luminescence of liquid argon following a current of drifting electrons. These results contribute to set benchmarks for breakdown-safe design of ionization detectors, such as Liquid Argon Time Projection Chambers (LAr TPC).

Fine-silt luminescence dating and mineral composition of sediments from the Arctic Ocean

New geochronometers are needed for sediments of the Arctic Ocean spanning at least the last half million years, largely because oxygen-isotope stratigraphy is relatively ineffective in this ocean, and because other dating techniques require significant assumptions about sedimentation rates. Multi-aliquot luminescence sediment-dating procedures were applied to polymineral, fine-silt samples from 9 core-top and 37 deeper samples from 20 cores representing 19 sites across the Arctic Ocean. Most samples have independent age assignments and other known properties (e.g., % coarse fraction, % carbonate, U-Th isotopes). Thick-source alpha-particle counting indicates that for most regions the contribution of measured unsupported 230Th and 231Pa to calculated dose rates is luminescence dating, and suggests that for several regions of the Arctic Ocean, interglacial-stage (foram-'rich') sediments from ridge tops are preferred for the fine-grain luminescence dating methods.

La plaque photographique. Propriétés - Le visible - L'invisible.

Mode of access: Internet.

Design of an algorithm for the display of visible surfaces /

"Supported in part by the Atomic Energy Commission under grant US AEC AT(11-1)2118."

Historia y magia natural o ciencia de filosofia oculta : con nuevas noticias de los mas profundos mysterios, y secretos del universo visible ... /

Mode of access: Internet.

Anatomia de todo lo visible e invisible : compendio universal de ambos mundos : viaje fantastico... : noticia de los movimientos, y naturaleza de los cuerpos terrestres, y celestiales, y ciencia de los influxos de los eclipses de sol, y luna, hasta el fin del mundo... /

Mode of access: Internet.

Figure emblematique en trois langues, et seulement en vne visible de soy : ou se peut voir vne fleur de louanges du roy tres-chrestien, de la royne, de monseigneur le dauphin, & de monseigneur le duc d'Orleans ... Plus un panegyric, & traicte de l'institution d'vn ieune prince.

Mode of access: Internet.

The Church of England a portion of Christ's one holy Catholic Church, and a means of restoring visible unity : an eirenicon, in a letter to the author of "The Christian year" /

Mode of access: Internet.

Conocimiento de Jesu-Christo considerado en sus misterios, y en las diferentes qualidades ó respectos que tiene para con Dios su padre, con este mundo visible, con los hombres en sus diversos estados, y con los bienaventurados en el cielo ... /

Mode of access: Internet.

Conocimiento de Jesu-Christo considerado en sus misterios, y en las diferentes qualidades ó respectos que tiene para con Dios su padre, con este mundo visible, con los hombres en sus diversos estados, y con los bienaventurados en el cielo ... /

Mode of access: Internet.

Conocimiento de Jesu-Christo considerado en sus misterios y en las diferentes qualidades ó respectos que tiene para con Dios su padre, con este mundo visible, con los hombres en sus diversos estados, y con los bienaventurados en el cielo ... /

Mode of access: Internet.

The American society for the control of cancer : its objects and methods and some of the visible results of its work.

Mode of access: Internet.

Fundamental research on the luminescence of solids. Final report January 1, 1947-July 15, 1949.

At head of title: Office of Naval Research. Contract no. N7onr-284, Task order no. 1"