著者

堀内 公子 鳥居 鉄也 村上 悠紀雄 Kimiko HORIUCHI Tetsuya TORII Yukio MURAKAMI

雑誌

南極資料 (ISSN:00857289)

巻号頁・発行日

vol.58, pp.69-80, 1977-03

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ドライバレー地域の掘削で得られたDVDP 13コアー試料とベストフォールド・ヒルズの湖底堆積物について,過塩素酸可溶部と不溶部の炭酸ナトリウム融解抽出部のそれぞれの中のRa量を求めた.Raの定量は放射平衡に達したRnを液体シンチレーションカウンターで測定した.BGが45 cpmのとき,その1/8を測定下限とすると,2gの試料で0.25±0.04×10^<-12> Ci/g のRaの測定が可能である.UとThとの地球化学的な行動が異なることに基づいて考察すると,Uは海水で運ばれ,生成した^<230>Thが沈積しやすく,娘核種の^<226>Raとは一万年弱で放射平衡に達する.放射平衡に達するまで^<226>Raの量は次第にふえ,それから7.5×10^4年の半減期で減少していく.ゆえに過塩素酸可溶部と炭酸ナトリウム融解部のRaを定量することにより,堆積生成以来のおよその年代の古さを知り得る.ドライバレー地域では前者の値が後者より数倍も多く今回の試料中で最も古く,スチニア湖湖底堆積物は最も新しいと推定した.The ignition loss and the Ra content in the 10% HClO_4-soluble fraction and Na_2CO_3-fusion fraction were respectively determined for the 17 core samples (DVDP 13 core), down to the depth of 50 meters and for the four lake deposits in the Vestfold Hills. The determination of Ra was performed by measuring the activity of Ra in radioactive equilibrium state with a liquid scintillation counter. The detection limit of Ra with 2 grams of sample wag (0.25±0.04)×10^<-12> Ci/g, taking one-eighth of the BG counting rate, 45 cpm, as the limit in this case. Based on the differences between U and Th in geochemical behaviors, it is thought that U is transported into sea water and decays to ^<230>Th which tends to precipitate in the site. From ^<230>Th is produced ^<226>Ra which attains the radioactive equilibrium within a little under ten thousand years. And then, the ^<226>Ra content gradually increases with a half life of 7.5×10^4 years. Therefore, by determining the ratio of Ra in the HClO_4-soluble fraction to that in the Na_2CO_3-fusion fraction of a sample, it is possible to determine its age since the time of sedimentation. The results obtained indicate that the Dry Valley sediment is the oldest while the Lake Stinear sediment is the latest because the ratio is the largest for the former and the smallest for the latter.

著者

豊国

出版者

若与

雑誌

源氏後集余情

巻号頁・発行日

1858

著者

千野 靖正 黄新 胜 鈴木 一孝

出版者

公益社団法人 日本金属学会

雑誌

日本金属学会誌 (ISSN:00214876)

巻号頁・発行日

vol.81, no.2, pp.49-54, 2017-02-01 (Released:2017-01-25)

参考文献数

41

被引用文献数

18

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Magnesium (Mg) alloys are suitable materials for weight reduction in vehicles because of their low densities and high specific strengths. However, rolled Mg alloy sheets generally exhibit a poor formability at room temperature and thus their applications are restricted. This poor formability is originated from basal slip dominated deformation as well as strong basal texture. It is known that the formability can be improved by suppression of basal texture formation. Thus, large efforts have been devoted to texture control for the purpose of enhancing the room temperature formability. In this paper, recent researches for texture control of rolled Mg alloy sheets are reviewed.0

著者

林 重成 高島 大 河内 礼文 西山 佳孝

出版者

公益社団法人 日本金属学会

雑誌

日本金属学会誌 (ISSN:00214876)

巻号頁・発行日

vol.81, no.9, pp.417-426, 2017-09-01 (Released:2017-08-25)

参考文献数

11

被引用文献数

1

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High-temperature oxidation behavior of Fe-Ni-Cr alloys with different Ni contents in air and steam at 700°C was investigated. Oxidation mass gain in steam was higher than that in air. In both atmospheres oxidation mass gain tended to decrease with increasing Ni content. However, the Ni concentration dependence of oxidation mass gain in air was complex, i.e., oxidation mass gain increased with increase in Ni content up to 35% then decreased with higher Ni content. But oxidation mass gain of binary Ni-20Cr significantly increased. Such a complex oxidation behavior was not observed when alloys were oxidized in steam. The internal oxidation zone was locally formed in air, and a Cr2O3 scale was found to develop on the areas without internal oxidation. The size of area, where an internal oxidation zone was developed, changed depending on Ni content. In steam, most of the surface area of alloys was covered by an internal oxidation zone. Cr content, 20%, was considered to be insufficient but close to the critical Cr content for exclusive Cr2O3 scale formation in air. The critical Cr content for exclusive Cr2O3 scale formation was found to depend on alloy Ni content due to lower oxygen permeability in alloys with higher Ni content and the cross-term effect for Cr outward diffusion.

著者

作左部 剛視 木内 雄二

出版者

一般社団法人映像情報メディア学会

雑誌

テレビジョン学会誌 (ISSN:03866831)

巻号頁・発行日

vol.37, no.9, pp.717-722_1, 1983

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直径6μmの微小なピンホールを用いて1インチビジコン形撮像管の走査ビームの電流密度分布を直接測定した.ベストフォーカスしたビームはガウス分布に近く, 静電集束電磁偏向 (SM) 方式より電磁集束電磁偏向 (MM) 方式のほうがスポット径が小さく, ビームの広がりも少ない.G<SUB>2</SUB>に30μmアパーチャーを用いた通常動作の場合, ターゲット上のスポット径の半値幅は20-30μmあり, このスポットに対する物点はG<SUB>2</SUB>のリミティングアパーチャーでなくアパーチャーごしにみたクロスオーバーである.またその半値幅は20μmで, アパーチャーからカソード寄り0.7-0.8mmの位置にあることが明らかになった.

著者

荒木 理 藤井 浩平 赤間 大地 土山 聡宏 高木 節雄 大村 孝仁 高橋 淳

出版者

一般社団法人 日本鉄鋼協会

雑誌

鉄と鋼 (ISSN:00211575)

巻号頁・発行日

vol.103, no.8, pp.491-497, 2017 (Released:2017-07-31)

参考文献数

28

被引用文献数

15

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Effect of aging treatment at 373 K on Hall-Petch coefficient (ky) was investigated in consideration of the change in friction stress associated with carbide/nitride precipitation in ferritic steels containing 60 ppm carbon or nitrogen (C60 and N60). Tensile tests revealed that the ky was monotonously increased with increasing aging time in both steels, and also, C60 exhibited a larger ky value than that of N60 under the same aging time. As a result of 3DAP analysis and theoretical calculation for grain boundary segregation of carbon and nitrogen, the ky corresponded to the amount of carbon and nitrogen existing at grain boundary. There was no difference in the effect on ky increment between both elements. The larger ky in C60 under the same aging condition was due to the larger amount of segregated carbon compared with nitrogen.

著者

神野 憲博 濱田 純一 金子 賢治

出版者

一般社団法人 日本鉄鋼協会

雑誌

鉄と鋼 (ISSN:00211575)

巻号頁・発行日

vol.103, no.9, pp.539-548, 2017 (Released:2017-08-31)

参考文献数

50

被引用文献数

1

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In this study, Cu-added ferritic stainless steel sheets were investigated to understand the influences of Cu contents on the high-temperature strength during the high-temperature deformation. High-temperature proof stress at 700~900°C was improved greatly by addition of more than 1% of Cu. In the case of static aging at 900°C, the rod-shaped ε-Cu particles satisfied the K-S orientation relationship with the α matrix, but spherical-shaped ε-Cu particles without specific orientation relationship started appearing during the tensile deformation at 900°C. Similarly, the spherical-shaped and fine ε-Cu particles were observed during the thermal fatigue process in the temperature range from 200°C to 700°C with a 50% restriction ratio. During the observation using the high-temperature in-situ TEM straining, it was clarified that the ε-Cu particles were divided by dislocation shearing and parts of them were found dissolved. According to the LSW theory, it was suggested that the microstructure with fine and spherical-shaped ε-Cu particles was formed by the repetition of dissolution and precipitation during the high-temperature deformation.

著者

土田 紀之 大倉 誠史 田中 孝明 田路 勇樹

出版者

一般社団法人 日本鉄鋼協会

雑誌

鉄と鋼 (ISSN:00211575)

巻号頁・発行日

vol.103, no.10, pp.597-605, 2017 (Released:2017-09-30)

参考文献数

39

被引用文献数

3

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High-speed deformation behavior and their strain rate dependence on mechanical properties of 1 GPa-grade TRIP-aided multi-phase (TRIP) steels were studied. The strain rate range in this study was between 3.3×10–6 and 103 s–1, and the effect of retained austenite (γR) shapes on TRIP effect in the 1 GPa-grade TRIP steel was also focused on. The effects of strain rate on tensile strength and flow stress in the TRIP steels were small whereas that on uniform elongation was large. The strain rate dependences on tensile strength and uniform elongation in the TRIP steels were more closely to those of the metastable austenitic stainless steels than the conventional TRIP and dual-phase steels. The 1 GPa-grade TRIP steel with the γR shape of needle-like showed better tensile properties and absorbed energy in the present strain rate range. The volume fraction of γR more than 20% and the matrix microstructure of martensite seem to be important factors in the high-strength TRIP steels.

著者

川松 豊 杉原 弘貞 佐々木 希吉 森本 浩

出版者

天然有機化合物討論会実行委員会

雑誌

天然有機化合物討論会講演要旨集

巻号頁・発行日

vol.13, pp.99-106, 1969

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I. Synthesis of 2,3-dialkoxy-5-alkyl-1,4-benzoquinone a) 4a and 4b obtained from 1 were oxidized with organic peracids to give 2,3-dimethoxy-(5a) and 2,3-diethoxy-5-methyl-1,4-benzoquinone (5b). b) 9a and 9b obtained from 6 were oxidized in a similar manner to give 5a and 10. II. Synthesis of isoprenoid quinones The authors found two new condensation methods. a) Method using an N-sulfinylamine. A solution of hydroquinone (12), methyl N-sulfinylanthranilate (14) and phytol (13) in dioxane was heated and oxidized with ferric chloride to give 2,3-dimethoxy-5-methyl-6-phytyl-1,4-benzoquinone (15) as well as by-products 16 and 17. The structures of 16 and 17 were made clear and the reaction mechanism was discussed. The results are shown in Table 1. b) Method using a metal. A solution of 5a and X-CH_2-CH=C-CH_3-CH_2-R in petroleum ether was treated with slightly an excess amount of amalgamated zinc at the room temperature to give 18. The product 18 was obtained also from hydroquinone (12). The reaction mechanism and the results are shown in Table 2. III. Stereochemistry of isoprenoid quinones It has been so far known that the steric configuration of the side chain of naturally occurring isoprenoid quinones is all-trans, but synthesized isoprenoid quinones inevitably contain a small amount of the cis-isomer. Then, the authors separated these isomers by the column chromatography to confirm their yields and to compare their NMR spectra with each other. The relationship between the structures of the quinones and the biological activity is also mentioned.

著者

川松 豊 杉原 弘貞 佐々木 希吉 森本 浩

出版者

天然有機化合物討論会

雑誌

天然有機化合物討論会講演要旨集

巻号頁・発行日

no.13, pp.99-106, 1969-09-01

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I. Synthesis of 2,3-dialkoxy-5-alkyl-1,4-benzoquinone a) 4a and 4b obtained from 1 were oxidized with organic peracids to give 2,3-dimethoxy-(5a) and 2,3-diethoxy-5-methyl-1,4-benzoquinone (5b). b) 9a and 9b obtained from 6 were oxidized in a similar manner to give 5a and 10. II. Synthesis of isoprenoid quinones The authors found two new condensation methods. a) Method using an N-sulfinylamine. A solution of hydroquinone (12), methyl N-sulfinylanthranilate (14) and phytol (13) in dioxane was heated and oxidized with ferric chloride to give 2,3-dimethoxy-5-methyl-6-phytyl-1,4-benzoquinone (15) as well as by-products 16 and 17. The structures of 16 and 17 were made clear and the reaction mechanism was discussed. The results are shown in Table 1. b) Method using a metal. A solution of 5a and X-CH_2-CH=C-CH_3-CH_2-R in petroleum ether was treated with slightly an excess amount of amalgamated zinc at the room temperature to give 18. The product 18 was obtained also from hydroquinone (12). The reaction mechanism and the results are shown in Table 2. III. Stereochemistry of isoprenoid quinones It has been so far known that the steric configuration of the side chain of naturally occurring isoprenoid quinones is all-trans, but synthesized isoprenoid quinones inevitably contain a small amount of the cis-isomer. Then, the authors separated these isomers by the column chromatography to confirm their yields and to compare their NMR spectra with each other. The relationship between the structures of the quinones and the biological activity is also mentioned.

著者

南部 泰士 佐々木 希 南部 美由紀 佐々木 英行 桐原 優子 月澤 恵子 今野谷 美名子 高橋 俊明

出版者

THE JAPANESE ASSOCIATION OF RURAL MEDICINE

雑誌

日本農村医学会雑誌 (ISSN:04682513)

巻号頁・発行日

vol.60, no.2, pp.76-84, 2011

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秋田県南部前期高齢者女性の介護予防基本チェックリストと骨密度の関連を明らかにし,今後の介護予防支援事業における基礎情報の提供を目的に調査を行なった。基本チェックリスト『口腔』の症状がある前期高齢者女性は骨密度が低かった。また,特定高齢者判定基準で『口腔』に該当している前期高齢者女性は,『運動』,『うつ』の生活機能が低下していた。<br> 骨密度は前期高齢者女性の要介護リスクを判断する指標となることから,骨密度の維持および向上を図る,骨粗鬆症検診の受診率を向上させる必要がある。

著者

南部 泰士 佐々木 希 南部 美由紀 佐々木 英行 桐原 優子 月澤 恵子 今野谷 美名子 高橋 俊明

出版者

日本農村医学会

雑誌

日本農村医学会雑誌 (ISSN:04682513)

巻号頁・発行日

vol.60, no.2, pp.76-84, 2011-07-30

被引用文献数

1

著者

乾隆敕輯

出版者

浙江重刊

巻号頁・発行日

vol.第70-71冊, 1000

著者

川島 智生

出版者

日本建築学会

雑誌

日本建築学会計画系論文集 (ISSN:13404210)

巻号頁・発行日

vol.61, no.489, pp.213-222, 1996-11-30 (Released:2017-02-02)

参考文献数

1

被引用文献数

1 1

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From the Taisho era to the beginning of Showa era reinforced-concrete school buildings gave variety to the design of elementary school buiIdings. Take Osaka city for instanse, the abolition of the school district system rapidly promoted the tendency of building reinforced-concrete school buiIdings. The design was not made by official architects in the city office, but by freelance architects. Designing individual freelance architects is reflected in school buildings, which is worthy of attention. The diversity and uniqueness in designing are characteristics of elementary school buildings before the abolition of school districts system. The study made it clear that the existence of freelance architects can never be ignored in describing the history of designing of school buildings.

著者

浦本誉至史著

出版者

明石書店

巻号頁・発行日

2003

著者

緒方 あゆみ

雑誌

中京ロイヤー = CHUKYO LAWYER

巻号頁・発行日

vol.17, no.1, pp.1-18, 2012-09

出版者

日経BP社

雑誌

日経ア-キテクチュア (ISSN:03850870)

巻号頁・発行日

no.748, pp.22-26, 2003-07-07

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島の宮浦港から美術館の現場に向かう途中、11年前に建てられたベネッセハウスのホテル棟に立ち寄ってみた。打ち放しコンクリートの所々にジャンカやコールドジョイントがある。「さすがの安藤さんも、生コン工場のない離島では思い通りのコンクリートを打つのは難しいのか」。そう思わされた。

著者

温故道人 訳

出版者

刊

巻号頁・発行日

vol.[1],

著者

中薮 俊博 森 基 滝田 敦夫 岡路 正博 今井 秀孝

出版者

公益社団法人精密工学会

雑誌

精密工学会誌 (ISSN:09120289)

巻号頁・発行日

vol.61, no.2, pp.253-257, 1995-02-05

参考文献数

3

被引用文献数

1 5

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An accurate and practical system for the measurement of rolling that occurs with the movement of a machine tool unit has been developed. The system consists of a bi-prism, two plane mirrors, and a double-path optical heterodyne laser interferometer. The measurement of rolling with this system is not affected by pitching, yawing, heaving, and swaying. The measurement system was confirmed to have a sensitivity of 0.032μm/arcsec (variation of path length/unit angle of rolling), a resolution of 0.31 arcsec (used in λ/64 measurement system), and 800 mm travel length. In order to investigate the rolling that occurs in a machining centre (680 × 500 × 630 mm), the measurement was carried out in full stroke of each unit in the machining centre. The results show the reliable agreements in replication measurement.

著者

荒井 克俊 田中 敦 楠 忠夫 鈴木 亮

出版者

日本水産増殖学会

雑誌

水産増殖 (ISSN:03714217)

巻号頁・発行日

vol.42, no.4, pp.585-591, 1994-12-20 (Released:2010-03-09)

参考文献数

23

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シマドジョウ四倍体種族, 二倍体種族, およびドジョウ間の雑種のPGM, IDHP-2, LDH-1, AAT-1遺伝子座におけるアロザイム発現を調べ, 雑種性と倍数性を検討した。その結果, シマドジョウ四倍体種族と他二者との種族間, 属間交雑の子孫は, 三倍体に特有な異型接合遺伝子型を示し, 三倍体雑種であることが判った。一方, シマドジョウ二倍体種族とドジョウとの属間交雑子孫は二倍体型の異型接合遺伝子型を示し, 二倍体雑種であることが判明した。