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Digitale Medien

Photoenhanced wet oxidation of gallium nitride (2000)

Peng, L.-H. ; Liao, C.-H. ; Hsu, Y.-C.

Woodbury, NY : American Institute of Physics (AIP)

Applied Physics Letters 76 (2000), S. 511-513

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ISSN: 1077-3118

Quelle: AIP Digital Archive

Thema: Physik

Notizen: We investigate the photo-oxidation process and the corresponding passivation effects on the optical properties of unintentionally doped n-type gallium nitride (GaN). When illuminated with a 253.7 nm mercury line source, oxidation of GaN is found to take place in aqueous phosphorus acid solutions with pH values ranging from 3 to 4. At room temperature, the photo-oxidation process is found reaction-rate limited and has a peak value of 224 nm/h at pH=3.5. Compared with the as-grown GaN layers, threefold enhancement in the photocurrent and photoluminescence response are observed on the oxidized GaN surfaces. These results are attributed to the surface passivation effects due to the deep ultraviolet-enhanced wet oxidation on GaN. © 2000 American Institute of Physics.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1063/1.125804

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Application of simulation technique on debris flow hazard zone delineation: a case study in the Daniao tribe, Eastern Taiwan (2011)

Tsai, M. P. ; Hsu, Y. C. ; Li, H. C. ; [weitere]

Copernicus

In: Natural Hazards and Earth System Sciences. 2011; 11(11): 3053-3062. Published 2011 Nov 18. doi: 10.5194/nhess-11-3053-2011.

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Publikationsdatum: 2011-11-18

Beschreibung: Typhoon Morakot struck Taiwan in August 2009 and induced considerable disasters, including large-scale landslides and debris flows. One of these debris flows was experienced by the Daniao tribe in Taitung, Eastern Taiwan. The volume was in excess of 500 000 m3, which was substantially larger than the original design mitigation capacity. This study considered large-scale debris flow simulations in various volumes at the same area by using the DEBRIS-2D numerical program. The program uses the generalized Julien and Lan (1991) rheological model to simulate debris flows. In this paper, the sensitivity factor considered on the debris flow spreading is the amount of the debris flow initial volume. These simulated results in various amounts of debris flow initial volume demonstrated that maximal depths of debris flows were almost deposited in the same area, and also revealed that a 20% variation in estimating the amount of total volume at this particular site results in a 2.75% variation on the final front position. Because of the limited watershed terrain, the hazard zones of debris flows were not expanded. Therefore, the amount of the debris flow initial volume was not sensitive.

Print ISSN: 1561-8633

Digitale ISSN: 1684-9981

Thema: Geographie , Geologie und Paläontologie

Publiziert von Copernicus im Namen von European Geosciences Union.

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