巻号一覧
12 巻 (1978)
- 4 号 p. 201-
- 3 号 p. 137-
- 2 号 p. 69-
- 1 号 p. 1-
12 巻, 1 号
選択された号の論文の12件中1～12を表示しています
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Bunji Iwasaki, Noboru Kimizuka1978 年 12 巻 1 号 p. 1-6
発行日: 1978/03/20
公開日: 2008/04/08
ジャーナル フリーA polycrystalline EuAl2Si2O8 was synthesized in a solid state at 1, 300°C and oxygen fugacities below 10-6 atm. Crystals were grown from a melt of the polycrystalline EuAl2Si2O8 at temperatures from 1, 590°C to 1, 380°C at the cooling rate of 1.5°/hour in the gas mixtures (CO2/H2=1). The single crystal was monoclinic, and indicated diffraction symmetry consistent with the space groups C2/m, Cm, and C2. The cell dimensions are: a = 8.341(2) Å; b = 12.972(2) Å; c = 7.112(2) Å;β = 115.50(2)°. This compound is the most similar to Sr-feldspar among the MAl2Si2O8 feldspars (M: Ca, Sr, Ba, and Pb) in cell dimensions and infrared absorption spectrum.抄録全体を表示PDF形式でダウンロード (1483K) -
Vern Hodge, Susan R. Johnson, Edward D. Goldberg1978 年 12 巻 1 号 p. 7-20
発行日: 1978/03/20
公開日: 2008/04/08
ジャーナル フリーTwelve metals, Pb-210 and Pu-239+240 were measured over a year's period in atmospheric aerosols collected at La Jolla, California and Ensenada, Baja California. Substantial amounts of the metals in the solid phases are leachable into sea water. During the winter months at La Jolla, lead, nickel and Pb-210 had higher atmospheric concentrations than at other times, suggesting local sources during this period of temperature inversion. Lead and nickel appear to have significant anthropogenic components. Overall, the concentrations of the metals and radionuclides in aerosols are similar to those in other sites of the northern hemisphere. For the southern California coastal region, the atmospheric fluxes of aerosols to the marine environment may govern measurably the metal concentrations in surface waters. On the other hand, these fluxes do not account for the accumulation of metals in the coastal sediments.抄録全体を表示PDF形式でダウンロード (3466K) -
William Rosen, Peter M. Williams1978 年 12 巻 1 号 p. 21-27
発行日: 1978/03/20
公開日: 2008/04/08
ジャーナル フリーCopper chelation in seawater by a variety of organic ligands is shown to be dependent upon the stability of the model complex and the pH of the medium. Amino acids, citric acid and citric acid-like compounds are potentially the most important contributors to the speciation of copper in the soluble organic realm of seawater.抄録全体を表示PDF形式でダウンロード (2050K) -
Yasushi Kitano, Minoru Okumura, Masatoshi Idogaki1978 年 12 巻 1 号 p. 29-37
発行日: 1978/03/20
公開日: 2008/04/08
ジャーナル フリーThe coprecipitation of phosphate ions with calcium carbonate precipitated from calcium bicarbonate solution and the adsorption of phosphate ions on suspended calcium carbonate have been studied experimentally. (1) There are some differences in the mode of coprecipitation of phosphate ions with calcium carbonate formed from calcium bicarbonate solution between stirring and non-stirring (keeping still) the solution as follows: The amount of phosphate ions coprecipitated with calcium carbonate is larger when stirred than when kept still. In the keeping still system the amount of phosphate ions coprecipitated with calcite is approximately equal to that with aragonite, whereas in the stirring system the amount increases with increasing proportion of aragonite in calcium carbonate formed. (2) Phosphate ions in a parent solution favor the formation of calcite. (3) Phosphate ions are more easily adsorbed on suspended aragonite than on suspended calcite. The adsorption of phosphate ions on suspended calcium carbonate occurs in a solution containing fluoride ions by the following three steps: (a) The first remarkable adsorption occurs within several hours independent of the chemical composition of the solution. (b) The adsorption apparently reaches saturation. (c) Then the great adsorption occurs again after about 80 hours. This final adsorption is observed very clearly in a solution containing a large amount of fluoride ions. The adsorption of fluoride ions occurs with the final adsorption of phosphate ions. The marked adsorption of phosphate and fluoride ions on suspended calcium carbonate is related to the formation of apatite.抄録全体を表示PDF形式でダウンロード (2903K) -
Shizuo Tsunogai, Mitsuo Uematsu1978 年 12 巻 1 号 p. 39-46
発行日: 1978/03/20
公開日: 2008/04/08
ジャーナル フリーSeawater samples collected in a coastal area in Funka Bay, Hokkaido, were analyzed for manganese, iron and aluminum in particulate form and for the total concentrations of manganese and iron. A marked contrast was found in the seasonal variations of their distribution with high concentrations of particulate aluminum in winter and total manganese in summer. The causes of the seasonal variations are the dissolution of manganese from the sea floor and the influx of terrigenous material probably transported by the winter monsoon, although resuspension of particles from the bottom and in situ biological decomposition contribute somewhat to the variations in the lower layers of the bay water. When the particulate matter becomes incorporated into the bottom sediments, the proportions of metals lost from the particles are calculated to be more than 76% for manganese and 57% for iron. The rates of resupply to the coastal water estimated from the particulate flux are calculated to be 0.5 and 10g/m2/yr for manganese and iron, respectively.抄録全体を表示PDF形式でダウンロード (2365K) -
Shizuo Tsunogai, Masao Minagawa1978 年 12 巻 1 号 p. 47-56
発行日: 1978/03/20
公開日: 2008/04/08
ジャーナル フリー“Settling model” is proposed as a removal mechanism of chemical elements in the ocean on the basis of the behavior of insoluble radionuclides in seawater. In the settling model more than 20 elements such as Fe and Th exist substantially in one particulate phase which is settling with a mean velocity of 2×10-4 cm/sec by forming large particles with organic material. There is much favorable evidence for the settling model such as the coincidence of the residence time of these insoluble elements, specific activity of settling material similar to that of particles suspended in seawater, nearly the same proportion, about 10%, of particulate fraction (> 0.45μm) for all the insoluble elements when subsurface water is filtered, etc. The settling model is applied to Th-234 in the surface water and the vertical eddy diffusivity of the water is calculated to be about 30cm2/sec.抄録全体を表示PDF形式でダウンロード (3341K) -
Yoshihiko Mizutani1978 年 12 巻 1 号 p. 57-63
発行日: 1978/03/20
公開日: 2008/04/08
ジャーナル フリーδD and δ18O values of fumarolic condensates collected from the Showashinzan volcano, Hokkaido, Japan, during the period from 1954 to 1974 were determined. The results indicate that the fumarolic condensates are mixtures of magmatic water and local surface waters. The mixing of these two waters is suggested to have proceeded at very shallow parts of the volcano. The local surface water infiltrating the volcano shifted its δ18O value by the oxygen isotopic exchange with hot wall rocks. The degree of oxygen isotope shift of the water varied year after year as the fumarolic activity diminished. This variation caused remarkable variations in δ18O value of fumarolic condensates with time. On the basis of variations in δD and δ18O values of fumarolic condensates with time the isotopic composition of magmatic water is estimated to be -32‰ (SMOW) in δD and +7.4‰ (SMOW) in δ18O.抄録全体を表示PDF形式でダウンロード (1694K) -
Susumu Osaki, Hiromitsu Katsube, Masako Okaguchi, Yoshimasa Takashima1978 年 12 巻 1 号 p. 65-67
発行日: 1978/03/20
公開日: 2008/04/08
ジャーナル フリーSystematic annealing experiments of fission tracks were carried out with three hornblendes from a granodiorite, a schist and an andesite. Almost all tracks disappeared in 2 hours at 550°C for hornblende from a granodiorite and at 650°C for those from a schist and an andesite. Extrapolation of experimentally determined temperatures suggests that fission tracks in hornblende become undetected, if heated above 300 ± 50°C for the period between 102 and 106 years.抄録全体を表示PDF形式でダウンロード (769K) -
1978 年 12 巻 1 号 p. e1a
発行日: 1978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 (620K) -
1978 年 12 巻 1 号 p. e1b
発行日: 1978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 (620K) -
1978 年 12 巻 1 号 p. e1c
発行日: 1978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 (620K) -
1978 年 12 巻 1 号 p. e1d
発行日: 1978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 (620K)
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