巻号一覧
19 巻, 5 号
選択された号の論文の6件中1～6を表示しています
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K. K. Saebo, P. K. Kuroda1986 年 19 巻 5 号 p. 251-257
発行日: 1986/10/20
公開日: 2008/09/26
ジャーナル フリーThe origin of the isotopically anomalous xenon components reported to have been isolated from the carbonaceous chondrites Allende and Murchison can be attributed to the products of known nuclear processes, which also produce isotopic anomalies in a wide variety of substances including the light elements carbon, nitrogen, oxygen, and magnesium.抄録全体を表示PDF形式でダウンロード (2250K) -
Naotatsu Shikazono, Hidehiko Shimazaki1986 年 19 巻 5 号 p. 259-267
発行日: 1986/10/20
公開日: 2008/09/26
ジャーナル フリーSulfur isotopic compositions of sulfide minerals from the Yatani deposits which occur in the Green tuff region of Japan were determined separately for those from Zn-Pb and Au-Ag veins. δ34S values of Au-Ag veins are higher than those of Zn-Pb veins. The values for Zn-Pb veins and Au-Ag veins are ca. 0.5–4.5 ‰ and ca. 3–6 ‰, respectively. This difference in δ34S of Zn-Pb veins and Au-Ag veins is difficult to be explained by the equilibrium isotopic fractionation between aqueous reduced sulfur species and oxidized sulfur species at the site of ore deposition. The non-equilibrium rapid mixing of H2S rich fluid (deep fluid) with SO42- rich fluid (shallow fluid) is the most likely process for the cause of this difference. This fluid mixing can also explain the higher oxidation state of Au-Ag ore fluid and lower oxidation state of Zn-Pb ore fluid. Deposition of gold occurs by this mechanism but not by oxidation of H2S rich fluid.抄録全体を表示PDF形式でダウンロード (2650K) -
Keiichi Ohta1986 年 19 巻 5 号 p. 269-274
発行日: 1986/10/20
公開日: 2008/09/26
ジャーナル フリーThe emission rate of isoprene from an oak tree (Quercus serrata) in the field was measured at almost hourly intervals during daytime. The emission showed an marked diurnal variation with a maximum around noontime. More than 80% of daily emission occurred between 10:00 and 14:00. The emission rate correlated with light intensity, and their relationship could be described by a simple hyperbolic function. The daily isoprene emission showed a seasonal variation with a maximum in September. This seasonal variation differed considerably from the one presumed from average monthly temperatures, indicating the need of a check of seasonal variations in the case of the estimation of annual emission rate from vegetation.抄録全体を表示PDF形式でダウンロード (1747K) -
Yasuhiro Kiyosu1986 年 19 巻 5 号 p. 275-281
発行日: 1986/10/20
公開日: 2008/09/26
ジャーナル フリーFumarolic and geothermal well gases from several volcanic areas in Northeastern Japan have been examined for the N2/Ar and He/Ar ratios. The N2/Ar and He/Ar ratios of the gas samples are 40 to 2, 000 and 10-3 to 1, respectively, higher than those of the atmospheric air dissolved in groundwaters. The N2/Ar ratio becomes larger with increasing ratio of He to Ar. The data also show that nitrogen and helium in gases increase with increasing contribution of magmatic gas to the discharges and with decreasing contribution of groundwater. This suggests that the observed volcanic and geothermal gases may be mixtures of magmatic gas of uniform N2/Ar (≅4, 000) and He/Ar ratios (≅2) and local meteoric waters.抄録全体を表示PDF形式でダウンロード (1791K) -
S. C. Lee, H. H. S. C. Rao, Y. Sakuragi, N. Bakhtiar, F. S. Jiang, P. ...1986 年 19 巻 5 号 p. 283-288
発行日: 1986/10/20
公開日: 2008/09/26
ジャーナル フリーRadiochemical measurements of 239, 240Pu were carried out for a total of 288 individual rain and snow samples collected at Fayetteville (36°N, 94°W), Arkansas, during the period between February 1976 and October 1984. The results indicate that the plutonium inventory in the northern stratosphere has been decreasing during the past several years at a rate corresponding to about 1.2 years for the mean stratospheric residence time of plutonium. However, the fallout of plutonium may not be attributable solely to the atmospheric injections of nuclear debris from the weapons tests. It appears that the recent volcanic eruptions may have played an important role in altering the stratospheric inventory of plutonium.抄録全体を表示PDF形式でダウンロード (1697K) -
1986 年 19 巻 5 号 p. e3
発行日: 1986年
公開日: 2009/02/06
ジャーナル フリーPDF形式でダウンロード (323K)
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