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Digitale Medien

Characterization of nanostructured metal films by picosecond acoustics and interferometry (2001)

O'Hara, K. E. ; Hu, Xiaoyuan ; Cahill, David G.

[S.l.] : American Institute of Physics (AIP)

Journal of Applied Physics 90 (2001), S. 4852-4858

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Details

ISSN: 1089-7550

Quelle: AIP Digital Archive

Thema: Physik

Notizen: Picosecond interferometry is used to study the acoustics waves created by heating Pt films with a subpicosecond laser pulse. Both the period of the initial oscillations in the metal film and the amplitude of the sound wave in the substrate are measured quantitatively. The platinum films are roughened by irradiation with energetic ions. The amplitude of the sound wave is doubled at those irradiation levels where the platinum coverage has been reduced by about one-half. A theory for the amplitude of the launched acoustic wave predicts that the acoustic amplitude is proportional to the mean square film thickness. Thus changes in the morphology of a partially perforated metal film can be observed using a simple, nondestructive optical technique. © 2001 American Institute of Physics.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.1406543

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Digitale Medien

Gastritic glandularis et cystica profunda (1979)

Honoré, L. H. ; Lewis, A. S. ; O'Hara, K. E.

Springer

Digestive diseases and sciences 24 (1979), S. 48-52

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Details

ISSN: 1573-2568

Quelle: Springer Online Journal Archives 1860-2000

Thema: Medizin

Notizen: Abstract Three cases of gastritis glandularis et cystica profunda are presented, two associated with severe chronic gastritis and the other with invasive gastric carcinoma and chronic gastritis. This poorly known entity consists of benign downgrowths of deep gastric glands through the muscularis mucosae into, the submucosa. The pattern is primarily adenomatous with secondary cyst formation, which varies in extent and severity. The lesion is related to the chronic gastritis but why it should occur so rarely in such a common condition as chronic gastritis remains obscure. More documented cases are needed before a meaningful analysis can be attempted.