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Kazuhisa KOMURA Kok-Leong TAN Kaoru UENO 《Geostandards and Geoanalytical Research》1988,12(2):371-374
Uranium, thorium and potassium contents in eighteen geochemical reference samples issued from the Geological Survey of Japan have been measured by non-destructive gamma-ray spectrometry using germanium semiconductor detectors. Results are generally in good agreement with recent values measured by various methods. 相似文献
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MASATOSHI GOTO 《Island Arc》1994,3(4):247-254
Abstract In recent years, many fish teeth and scales have been found from the Palaeozoic and Mesozoic age strata of the Japanese Islands. This study is a compilation of the Japanese fish record from the Palaeozoic and early Mesozoic age deposits. Based on the published and unpublished data, the fossil fishes from the Palaeozoic and Early Mesozoic of Japan can be classified into 27 genera and 33 species, that is, one species of Devonian placoderms, 19 species of Permian to Jurassic elasmobranchs, three species of Permian cochliodonts, seven species of Carboniferous to Permian petalodonts, and three species of Triassic to Jurassic osteichthyans. 相似文献
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积云对流参数化对一交梅雨锋暴雨过程影响的模拟检验 总被引:12,自引:10,他引:2
应用1988年版日本谱模式JSM,对比分析了Arakawa-Sckawa-Schubert、Kain-Fritsch、KuoAnthes和Gadd-Keers等几种积云对流参数化方案在梅雨锋暴雨对流系统模拟中的表现。 相似文献
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Michael D. Audley † Fumiaki Nagase Kazuhisa Mitsuda Lorella Angelini Richard L. Kelley 《Monthly notices of the Royal Astronomical Society》2006,367(3):1147-1154
We report on two ASCA observations of the high-mass X-ray binary pulsar OAO 1657−415. A short observation near mid-eclipse caught the source in a low-intensity state, with a weak continuum and iron emission dominated by the 6.4-keV fluorescent line. A later, longer observation found the source in a high-intensity state and covered the uneclipsed through mid-eclipse phases. In the high-intensity state, the non-eclipse spectrum has an absorbed continuum component due to scattering by material near the pulsar and 80 per cent of the fluorescent iron emission comes from less than 19 light-second away from the pulsar. We find a dust-scattered X-ray halo whose intensity decays through the eclipse. We use this halo to estimate the distance to the source as 7.1 ± 1.3 kpc. 相似文献
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