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| 1.
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田崎, 和江 ; Tazaki, Kazue
概要:
金沢大学理工研究域地球社会基盤学系<br />By using a transmission electron microscope (TEM) equipped with an energy dispersive electron-mic
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roprobe analyzer, genetical relationships between micro-morphology and chemical composition of kaolin minerals were investigated.The TEM observation revealed that the kaolinite specimens, which show a 7Å basal reflection in X-ray diffraction diagram, are commonly mixtures of particles with various morphology such as film, hexagonal plate and long tube (Table 1). The chemical compositions of these kinds of particles are different from one another as shown in Fig. 1 and 2. Triangular plot of SiO2, Al2O3 and ΣFeO of the Kibushi clay (No.7 in Fig.2) shows limited chemistry of each morphology with slight overlap that SiO2 content of the film of indefinite primitive form is less than that of hexagonal plate, whereas, ΣFeO is lower in the latter. However, the chemistry of the Austria kaolin (No.5 in Fig.2) shows the reverse trend in SiO2 content. This reverse trend might suggest the difference in the source material.
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| 2.
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Asano, Takao ; Asano, Tetsuo ; Ypinter, Ron ; 浅野, 哲夫
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金沢大学<br />In this paper we show that Ω(n log n) operations are necessary to triangulate a polygonal region with n vertic
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es which contains holes (or windows). Also, we present a polynomial time algorithm for partitioning a polygonal region which may have a fixed number of holes into a minimum number of triangles. Finally, we discuss arbitrary-as opposed to chordal-minimum-number triangulations. © 1986.
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| 3.
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Yamamoto, Masayoshi ; Sakanoue, Masanobu ; 山本, 政儀 ; 阪上, 正信
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金沢大学環日本海域環境研究センター<br />Laboratory experiments using radiotracer of americium (241Am) and humic acid isolated from natura
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l surface soil have been conducted to evaluate the effect of added humic acid on the behavior of Am(III) in aqueous solution and the stability constant of the complex formed between Am(III) and humic acid. The former experiments were performed in the synthetic aqueous medium containing Ca or in fresh rain water at pH 6.5 and 4.5. At pH 6.5 in the absence of humic acid, Am(III) in both solutions [(Ca: 10 ppm) or rain water] was almostly adsorbed on the wall of the polyethylene vial used, and the major fraction of Am left in the solution was retained on the filter of 0.45μm pore size. On the other hand, in the presence of humic acid (100 ppm), the adsorption of Am on the vail was not observed, and the decrease of the retention of Am on the same filter suggests its complex formation with humic acid. At pH 4.5, the behavior of Am(III) in the solution (Ca: 10 ppm) was not influenced by the addition of humic acid (100 ppm). When the quantities of Ca were increased in the solution at a constant amount of humic acid, insoluble complexes were formed according to the increase of Ca to humic acid, and Am was scavenged over 90% as the insoluble complexes. The study of stability constant indicated that Am(III) had the strong interaction with humic acid.
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| 4.
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Yamamoto, Masayoshi ; Tanii, Taeko ; Sakanoue, Masanobu ; 山本, 政儀 ; 谷井, 妙子 ; 阪上, 正信
概要:
金沢大学環日本海域環境研究センター<br />Two kinds of samples have been tested to investigate the adsorption of plutonium in soil under na
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tural conditions. In a soil sample containing only about 5% of organic materials, no significant leaching of plutonium was observed with three kinds of extractants, namely, 1N-ammonium acetate, 5%-EDTA and 0.1N-sodium citrate, while some plutonium was leached with 0.1N-citric acid. The results of solubility tests made with natural soil organic acids, namely, humic and fulvic acids, showed that solubilization of plutonium by these acids is unlikely to occur in this soil sample. On the other hand, in another soil sample rich in organic materials (about 50%), significant leaching of plutonium was observed with all the extractants tested. The leaching of plutonium was especially very high with 0.1N-sodium citrate (about 60%) ; sodium citrate showing an initial pH of 8.4 probably solubilized some of organic materials present. Experiments made on extraction of organic materials with alkali solution also suggested that as much as 60-70% of plutonium in this soil sample was associated with some organic acids, whose carbon content was assumed to be 30-40% of the total organic carbon in the soil sample. This finding is very important from a view point of the uptake of plutonium by plant because plutonium associated with such organic acids is presumed to exist abundantly in cultivated soils which are quite rich in organic materials.
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| 5.
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Yamamoto, Masayoshi ; Yamamori, Shiro ; Komura, Kazuhisa ; Sakanoue, Masanobu ; 山本, 政儀 ; 山守, 志朗 ; 小村, 和久 ; 阪上, 正信
概要:
金沢大学環日本海域環境研究センター<br />The depth profiles and the particle size dependencies of the distributions of 239, 240Pu and 241A
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m in soil have been studied in comparison with those of 137Cs to obtain information on clarifying their behaviors and fates under the natural conditions. It was found that the concentrations of 239, 241Pu and 137Cs in soil decrease exponentially with increasing the depth, and over 80% of these fall-out radionuclides is accumulated in the upper 10 cm of the soils. The concentration of 241Am was measured by non-destructive γ-spectrometry using Ge-LEPS up to the depth of 6.5cm for two soil cores. The activity ratios of 241Am/239, 240Pu were found to be in the range from 0.25 to 0.30 for one core sample, while rather high values, i. e., 0.63-0.75, were obtained for another one. The particle size discrimination of surface soil showed that the concentrations of 239, 240Pu and 137Cs increase steadily with the particle size from coarse sand to clay fraction, while that of 241Am doesn't show such a tendency. These facts suggest that the behavior of 241Am in soil may be different from that of 239, 240Pu and 137Cs.
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| 6.
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Yamamoto, Masayoshi ; Sakanoue, Masanobu ; 山本, 政儀 ; 阪上, 正信
概要:
金沢大学環日本海域環境研究センター<br />Laboratory experiments using radiotracer of americium (241Am) and humic acid isolated from natura
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l surface soil have been conducted to evaluate the effect of added humic acid on the behavior of Am(III) in aqueous solution and the stability constant of the complex formed between Am(III) and humic acid. The former experiments were performed in the synthetic aqueous medium containing Ca or in fresh rain water at pH 6.5 and 4.5. At pH 6.5 in the absence of humic acid, Am(III) in both solutions [(Ca: 10 ppm) or rain water] was almostly adsorbed on the wall of the polyethylene vial used, and the major fraction of Am left in the solution was retained on the filter of 0.45μm pore size. On the other hand, in the presence of humic acid (100 ppm), the adsorption of Am on the vail was not observed, and the decrease of the retention of Am on the same filter suggests its complex formation with humic acid. At pH 4.5, the behavior of Am(III) in the solution (Ca: 10 ppm) was not influenced by the addition of humic acid (100 ppm). When the quantities of Ca were increased in the solution at a constant amount of humic acid, insoluble complexes were formed according to the increase of Ca to humic acid, and Am was scavenged over 90% as the insoluble complexes. The study of stability constant indicated that Am(III) had the strong interaction with humic acid.
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| 7.
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Yamamoto, Masayoshi ; Komura, Kazuhisa ; Sakanoue, Masanobu ; Hoshi, Masaharu ; Sawada, Shozo ; Okajima, Shunzo ; 山本, 政儀 ; 小村, 和久 ; 阪上, 正信 ; 星, 正治 ; 澤田, 昭三 ; 岡島, 俊三
概要:
金沢大学環日本海域環境研究センター<br />Plutonium Isotopes, 241Am and 137Cs in soil samples collected from Nagasaki and Hiroshima were me
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asured to evaluate the contribution of residual radioactivity derived from the atomic bombs dropped in 1945.In the soils from Nishiyama area of Nagasaki City, activity ratios different from those of global fallout were found for the 238Pu/239, 240Pu (0.05-0.06), 239, 240Pu/137Cs (0.2-0.3), 241Am/239, 240Pu (0.04-0.05) and 240Pu/239Pu (0.08-0.13), activity ratios indicating that a fair amount of plutonium derived from the atomic bomb had accumulated in this area. On the other hand, in the soils from the “Black-rain” area of Hiroshima, no significant difference from the global fallout was found for the activity ratios among the Pu isotopes, 241Am and 137Cs except for the soils collected at 10 km and 12 km in the NNW direction from the epicenter, where a factor 2 to 3 lower 241Am/239, 240Pu activity ratio was observed. However, no evidence of the contribution of the atomic bomb was found by the measurement of 240Pu/239Pu isotopic ratio.
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| 8.
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多田, 哲郎 ; 趙, 蘭才 ; 小村, 和久 ; 阪上, 正信 ; Tada, Tetsuro ; Zhao, Lancai ; Komura, Kazuhisa ; Sakanoue, Masanobu
概要:
金沢大学環日本海域環境研究センター
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| 9.
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Fuji, Norio ; 藤, 則雄
概要:
金沢大学教育学部理科教育<br />The present writer reported on the outline of the palaeoenvironmental, especially palaeovegetational a
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nd palaeoclimatic, changes around Lake Biwa during the last 600,000 years on the basis of the palynological analysis of samples taken at intervals of 5 m on a 200-meter core (Fuji and Hone, 1972; Fuji and Hone, 1977) drilled in 1971 at the bottom of 65 m below thepresent lake water level of Lake Biwa. In addition, the writer stated on the detailed palaeovegetation and palaeoclimate during the present -100 ,000 years B.P. on the basis of the palynological analysis of samples taken at intervals of 25 cm over the upper 55 m of the same core (Fuji, 1976a). In this article, the writer will debate minutely on the palaeoclimatic change during an age from 100,000-300,000 years B.P, from the view point of a palynology. The samples analysed for this investigation were used about 200 samples which were taken at intervals of about 25 cm throughout the middle part from 55-110 m of the 200-meter core.
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| 10.
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安川, 哲夫 ; Yasukawa, Tetsuo
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金沢大学人間社会研究域学校教育系
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| 11.
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小林, 幹夫 ; Kobayashi, Mikio
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| 12.
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Hatusima, Sumihiko ; 初島, 住彦
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| 13.
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芹沢, 俊介 ; Serizawa, Shunsuke
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| 14.
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吉川, 直人 ; Yoshikawa, Naoto
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| 15.
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白崎, 仁 ; Shirasaki, Hitoshi
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| 16.
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原, 慶太郎 ; Hara, Keitarou
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| 17.
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Kurita, Masahide ; 栗田, 正秀
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| 18.
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大原, 準之助 ; Ōhara, Jyunnosuke
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| 19.
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米澤, 信道 ; Yonezawa, Nobumichi
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| 20.
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大原, 準之助 ; Ōhara, Jyunnosuke
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| 21.
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里見, 信生 ; Satomi, Nobuo
概要:
p.70, p.77, p.81, p.104, pp.107-109
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| 22.
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Nakanishi, Hiroki ; 中西, 弘樹
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| 23.
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久米, 修 ; 鳴橋, 直弘 ; Kume, Osamu ; Naruhashi, Naohiro
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| 24.
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中山, 修一 ; Nakayama, Shuichi
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| 25.
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木下, 慶二 ; Kinoshita, Keiji
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| 26.
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植田, 邦彦 ; Ueda, Kunihiko
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| 27.
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米沢, 信道 ; Yonezawa, Nobumichi
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| 28.
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里見, 信生 ; Satomi, Nobuo
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p.20, p.26, p.39, p.54
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| 29.
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Saiki, Yasuhisa ; 斎木, 保久
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| 30.
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Saiki, Yasuhisa ; 斎木, 保久
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| 31.
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Naruhashi, Naohiro ; Sato, Takashi ; Tawan, Cheksum bt. ; 鳴橋, 直弘 ; 佐藤, 卓 ; チェクスム, タワン
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| 32.
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Hatakeyama, Shigeo ; 畠山, 茂雄
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| 33.
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Chang, Ching-en ; 張, 慶恩
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| 34.
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熊城, 修一 ; Noshiro, Shuichi
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| 35.
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角野, 康郎 ; Kadono, Yasuro
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| 36.
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福嶋, 司 ; Hukusima, Tukasa
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| 37.
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星野, 義延 ; 奥富, 清 ; Hoshino, Yoshinobu ; Okutomi, Kiyoshi
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| 38.
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中西, 弘樹 ; 吉野, 由紀夫 ; Nakanishi, Hiroki ; Yoshino, Yukio
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| 39.
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本浄, 高治 ; 八田, 昭夫 ; 西川, 洋明 ; 里見, 信生 ; Honjo, Takaharu ; Hatta, Akio ; Nishikawa, Hiroaki ; Satomi, Nobuo
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| 40.
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米沢, 信道 ; Yonezawa, Nobumichi
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| 41.
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大原, 準之助 ; Ōhara, Jyunnosuke
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| 42.
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土屋, 守 ; Tsuchiya, Mamoru
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| 43.
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里見, 信生 ; 古池, 博 ; Satomi, Nobuo ; Furuike, Hiroshi
概要:
p.105, p.115, p.145, p.154, pp.160-161
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| 44.
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Saiki, Yasuhisa ; 斎木, 保久
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| 45.
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Utech, Frederick H. ; Kawano, Shoichi ; Ohara, Masashi ; F.H., ユーテック ; 河野, 昭一 ; 大原, 雅
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| 46.
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Nakamura, Takehisa ; Suzuki, Kunio ; 中村, 武久 ; 鈴木, 邦雄
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| 47.
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八田, 洋章 ; Hatta, Hiroaki
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| 48.
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伊藤, 秀三 ; 中西, 弘樹 ; Itow, Syuzo ; Nakanishi, Hiroki
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| 49.
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Kurita, Masahide ; 栗田, 正秀
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| 50.
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鳴橋, 直弘 ; Naruhashi, Naohiro
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