著者
紙川 尚也 阿部 吉剛 宮本 吾郎 船川 義正 古原 忠
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.99, no.5, pp.352-361, 2013 (Released:2013-04-30)
参考文献数
46
被引用文献数
3 6

Tensile behavior and structure-property relationship of ferritic steels with nano-sized carbide dispersion were invesigated using Ti-added steel and Ti,Mo-added low carbon steels. By austenitizing followed by isothermal heat treatment at 700°C, polygonal ferrites containing very fine carbides of TiC and (Ti,Mo) C were obtained in the Ti-added and the Ti,Mo-added steels, respectively. The size of such carbides was finer in the Ti,Mo-added steel than in the Ti-added steel at the same holding period of isothermal heat treatment. The results of tensile tests for these samples showed that the strength is higher as the diameter of the carbides is smaller. The structure-based strength calculation led to a good agreement with the experiments, when it was assumed that the Ashby-Orowan mechanism is dominant for precipitation strengthening of nano-sized alloy carbides. It was also suggested that a relatively large tensile ductility is related to enhanced recovery during the tensile deformation, accompanied with promotion of secondary slips or cross slips in a finer scale due to the nano-sized particles.
著者
Yoshimasa Funakawa Tsuyoshi Shiozaki Kunikazu Tomita Tetsuo Yamamoto Eiji Maeda
出版者
一般社団法人 日本鉄鋼協会
雑誌
ISIJ International (ISSN:09151559)
巻号頁・発行日
vol.44, no.11, pp.1945-1951, 2004-11-15 (Released:2007-05-31)
参考文献数
24
被引用文献数
132 446

A ferritic steel precipitation-strengthened by nanometer-sized carbides was developed to obtain a high strength hot-rolled sheet steel having tensile strength of 780 MPa grade with excellent stretch flange formability. Manganese in a content of 1.5% and molybdenum in a content of 0.2% were added to 0.04% carbon Ti-bearing steel in order to lower austenite-ferrite transformation temperature for fine carbides and to retard generating of pearlite and large cementites, respectively. Tensile strength of hot-rolled sheet steel increased with titanium content and it was achieved to 800 MPa in a 0.09% Ti steel. Microstructure of the 0.09%Ti steel was ferrite without pearlite and large cementites. Fine carbides of 3 nm in diameter were observed in rows in the ferrite matrix of the 0.09% Ti steel with transmission electron microscope. The characteristic arrangement of the nanometer-sized carbides indicates that the carbides were formed at austenite-ferrite interfaces during transformation. By energy dispersive X-ray spectroscopy, the carbides were found to contain molybdenum in the same atomic concentration as titanium. Crystal structure of the nanometer-sized carbides was determined to be NaCl-type by X-ray diffractometry. The calculated amount of precipitation-strengthening by the carbides was approximately 300 MPa. This is two or three times higher than that of conventional Ti-bearing high strength hot-rolled sheet steels.Based on the results obtained in the laboratory investigation, mill trial was carried out. The developed hot-rolled high strength sheet steel exhibited excellent stretch flange formability.
著者
Augustin T. B. Orou Matilo Yoshiko Iida Takashi S. Kohyama
出版者
日本熱帯生態学会
雑誌
Tropics (ISSN:0917415X)
巻号頁・発行日
vol.22, no.2, pp.39-57, 2013-09-01 (Released:2013-09-05)
参考文献数
32
被引用文献数
3

The Dahomey gap is a savanna region separating the West African rainforests to two regions. We set two sites in this woody savanna, at north and south regions in purpose to examine the differences in tree community properties between sites and among canopy-closure types, and to reveal the factors affecting the differences. Two sites are ca. 225 km distant from each other and have different rainfall patterns. Six 1-ha plots in each site were studied, which cover three types of canopy-closure (closed, semi-open and open). We recorded 3,720 trees that are equal to or more than 5 cm diameter at the breast height, consisted of 70 species belonging to 34 families. Most abundant three species, Isoberlinia doka, Vitellaria paradoxa and Pericopsis laxiflora appeared in both sites. The detrended correspondence analysis (DCA) based on species abundance divided 12 plots into groups of north and south sites along the first axis, whereas canopy-closure types were not associated with DCA axes. At any given total tree height, trees in the north site had slenderer stems with narrower crowns than those in the south site. The specific leaf area was smaller in the north site. Between-site differences in species abundance and allometry are possibly driven by rainfall variation.
著者
鈴木 宏尚
出版者
財団法人 日本国際政治学会
雑誌
国際政治 (ISSN:04542215)
巻号頁・発行日
vol.2005, no.140, pp.57-72,L8, 2005-03-19 (Released:2010-09-01)
参考文献数
79

This article examines the diplomatic process of Japan's joining in the Organization for Economic Cooperation and Development (OECD) and illustrates that Japan's participating in the OECD should be regarded as its struggle for expanding its diplomatic space in the Free World, searching for both political and economic interests.The OECD, which was reorganized from the Organization European Economic Corporation (OEEC) under the initiative of the United States in 1961, was a forum established with the purpose of coordinating economic, trade and foreign aid policy among its members. Almost all the developed countries in the so called the “Free Word” or the West, including the US, Western European nations and Canada joined the OECD as its original members, but Japan was not one of them. This caused Japan to hold serious concerns about its isolation from the Free World. Japan had already established bilateral relations between the US, through which Japan and the Free World were only linked together. In that situation, Japan had an aspiration for expanding its diplomatic space in the Free World beyond its relations to the US, by participating in the OECD. Moreover, Hayato Ikeda administration, which wanted Japan to be equal footing with the US and European countries, considered that the membership of the OECD was essential to keep its economic growth. Thus it can be said that Japans' aim of joining in the organization was to pursue both economic and political interests.For the part of the US, Japan's participation in the OECD was regarded as its own interest, since it might enhance Japan's cooperation on economic assistance to the developing countries and strengthen its relation to the Free World stronger. Hence Japan was allowed its membership in the Development Assistance Group (DAG) of the OEEC in 1960. After OECD set on, the DAG was reorganized as the Development Assistance Committee (DAC), which was one of the main committees of the OECD. The biggest obstacle to Japan's joining in the main body of OECD was that European countries, which were the majority of the organization, opposed to it.Japan made diplomatic efforts to gain the support from European countries with the assistance of the US. Prime Minister Ikeda's visit to the European countries including the United Kingdom, France, West Germany and so on paved the way for the membership of the OECD. Through the discussion with Ikeda, the heads of these countries agreed to Japan's joining in the OECD. In March 1963, the OECD ultimately accepted Japan's full membership.
著者
鈴木 宏尚
出版者
財団法人 日本国際政治学会
雑誌
国際政治 (ISSN:04542215)
巻号頁・発行日
vol.2008, no.151, pp.89-104,L11, 2008-03-15 (Released:2010-09-01)
参考文献数
83

This article explores the foreign policy of the Hayato Ikeda administration toward the “Free World” of the United States and its European allies. In July 1960 in the immediate aftermath of the controversy surrounding revision of the U. S. -Japan security treaty, the Ikeda cabinet found itself in the midst of domestic turmoil and felt the sense of losing credibility from the international liberal camp. Hence it was imperative for the cabinet to stabilize domestic politics and restore Western trust on balance.The Ikeda cabinet sought to unify the nation in the economic sphere by adopting the Doubling National Income Plan. The plan relied on Western markets as exclusively export-oriented destinations for economic growth leading to European powers, such as Britain and France, to invoke the General Agreement of Tariff and Trade (GATT) Article XXXV to discriminate against Japanese imports. Improvement of relations with Europe was thus imminent for the sake of economic growth.This meant the Ikeda administration's effort to integrate Japan in the liberal camp via the deepening of its relations with the West. Subsequent diplomatic investment resulted in Japan's forging an “equal partnership” with Washington, gaining access to the meetings of the Organization for Economic Cooperation and Development (OECD), and European states' discontinuation of discriminatory measures. Hence Japan established itself to be part of the Free World.One can consider the movement against the U. S. -Japan security treaty as an intensification of “domestic cold war” closely associated with the Japan's position in “international cold war.” Ikeda won the domestic cold war by way of economic growth, which required Japan to be part of the West during the international cold war. In other words, the success of the Ikeda administration in balancing its domestic economic agenda with international situations epitomizes the interaction between domestic politics and foreign policy.
著者
Carlito B. Lebrilla
出版者
日本質量分析学会
雑誌
Mass Spectrometry (ISSN:2187137X)
巻号頁・発行日
vol.2, no.Special_Issue, pp.S0016-S0016, 2013-04-15 (Released:2013-05-03)
参考文献数
18
被引用文献数
1 3

The role of glycosylation and their biological functions whether as free oligosaccharides or glycoconjugates has been made possible by the recent advancements in the analyses of these compounds. The heterogeneity and the large structural diversity have made oligosaccharide analysis significantly more difficult than other biopolymers. The next stage of development is to achieve high throughput analysis. However, the structural elucidation of oligosaccharides remains an extremely difficult task. Recent reports reveal that the diversity of structures in a given biological system is finite and may not be large. It may be possible to create a database of structures that can be used to determine the identity of known compounds. This capability would therefore make high throughput glycomics possible. Achieving this task depends on the proper selection of chemical characteristics to identify the compound. In this presentation, nanoflow liquid chromatography retention times, accurate mass, and tandem MS is used to determine structure with a high degree of certainty. The method is used to determine the biological function of milk oligosaccharides as well as to discover glycan-based biomarkers for diseases.
著者
Shuichi Masuda Shoko Uchida Yumeko Terashima Hiroko Kuramoto Mika Serizawa Yuya Deguchi Kazuhiro Yanai Chitose Sugiyama Itaro Oguni Naohide Kinae
出版者
公益社団法人 日本薬学会
雑誌
Journal of Health Science (ISSN:13449702)
巻号頁・発行日
vol.52, no.3, pp.211-220, 2006 (Released:2006-06-01)
参考文献数
32
被引用文献数
7 16

The effects of repeatedly brewed green tea infusion on the formation of nitrosamine in vitro and in vivo, and on cancer mortality were examined. The first and second brews of green tea infusion inhibited the formation of nitrosomorpholine in the presence of morpholine and nitrite (nitrosation of morpholine), but the third to eighth brews accelerated it. The green tea infusion brewed from 5 g of leaves in 200 ml hot water (strong tea infusion) inhibited the nitrosation of morpholine, but that brewed from 2.5 g or less (weak tea infusion) promoted the nitrosation. The brewed green tea infusion that inhibited nitrosation of morpholine contained catechins at a high concentration, and that that promoted nitrosation contained catechins at a low concentration. The effects of green tea administered to Wistar male rats and that consumed by humans on the formation of nitrosamines were also examined. In both rats and humans, nitrosamine formation was inhibited by strong green tea extract but was increased by weak green tea extract. The concentration of catechins in the green tea infusion brewed by the general households in tea-producing areas was significantly higher than that brewed in non-producing areas. We examined the relationship between the concentration of catechins in green tea infusion brewed in different areas and the standardized mortality ratio (SMR) of cancer in respective areas, and found that the catechin concentration in green tea infusion correlated inversely and significantly with the SMR of cancer in that area. We concluded that strong green tea might inhibit the formation of nitrosamines and decrease the risk of carcinogenesis.
著者
Yukiko Hirabayashi Yong Zang Satoshi Watanabe Sujan Koirala Shinjiro Kanae
出版者
水文・水資源学会/日本地下水学会/日本水文科学会/陸水物理研究会
雑誌
Hydrological Research Letters (ISSN:18823416)
巻号頁・発行日
vol.7, no.1, pp.6-11, 2013 (Released:2013-03-09)
参考文献数
23
被引用文献数
10 38

We report a time series (1948–2100) of global-scale meltwater from mountain glaciers and ice caps (MGI) estimated by the global glacier model HYOGA2. HYOGA2 calculates the temporal fluctuation of the mass balance for 24,234 individual glaciers worldwide. It covers 90% of the total glacier area, except for glaciers in Greenland and Antarctica. HYOGA2 also accounts for regionally distributed changes in glacier area and altitude associated with glacier retreat and advance. By computation of individual glacier changes, future dissipation and glacier mass and area changes can be simulated in the model. The cumulative volume loss of water between 1948 and 2005 was estimated to be 25.9 ± 1.4 mm sea level equivalent (SLE). A future projection under a high-emission scenario demonstrated significant losses of water from MGI equivalent to 60.3 ± 7.9 mm SLE between 1948 and 2060 and 99.0 ± 14.9 mm SLE between 1948 and 2099.
著者
Kazuhiro Murata Shizukiyo Ishikawa Takashi Sugioka
出版者
日本プライマリ・ケア連合学会
雑誌
General Medicine (ISSN:13460072)
巻号頁・発行日
vol.14, no.1, pp.32-39, 2013 (Released:2013-07-05)
参考文献数
11
被引用文献数
2

Objective: With the recent aging trend in the Japanese population, dysphagia appears to be increasing. However, few epidemiologic surveys have been conducted to determine the prevalence of dysphagia in local inhabitants. Ohkuma et al. prepared a highly reliable questionnaire using a simple test and safe examination method. We investigated the presence/absence of symptoms of dysphagia in local inhabitants, evaluated their association with subjective symptoms, and examined whether the inhabitants were following a particular diet, which is the most important factor in management of dysphagia.Methods: A cross-sectional study involving 743 inhabitants (age: over 20) of an isolated island was performed. Each subject was asked basic questions (awareness about the presence/absence of dysphagia and dietary habits), and the data was analyzed by chi-square test. Based on their responses, dysphagia incidence was determined and rated on a 3-category scale (severe, mild, and no dysphagia).Results: Responses were recollected from 368 subjects (response rate, 49.5%). The percentage of subjects aware of dysphagia in the severe, mild, and no dysphagia groups was 13.8%, 3.2%, and 0%, respectively and the percentage of subjects who changed their dietary habits was 17.2%, 2.6%, and 0%. These percentages were significantly higher in the severe group than in the mild and no dysphagia groups, though the value was less than 20% in the 3 groups.Conclusion: Most subjects in the present study were unaware of dysphagia, suggesting that patients with dysphagia tend to be unaware of the key symptoms of dysphagia.
著者
Kanao Fukuda Joichi Sugimura
出版者
(社)日本トライボロジー学会
雑誌
Tribology Online (ISSN:18812198)
巻号頁・発行日
vol.8, no.1, pp.22-27, 2013-01-31 (Released:2013-01-31)
参考文献数
14
被引用文献数
1 14

The authors have clarified that trace impurities such as water and oxygen inevitably contained in a hydrogen environment influence friction and wear of metallic materials substantially and even often govern them. In this study, an experimental technique was devised to enable sliding tests in a hydrogen environment which contains controlled concentration of water and virtually no oxygen as impurities. By comparing data of Fe sliding tests between this study and our previous studies, the influences of water and oxygen were understood separately. Water without oxygen as impurity in a hydrogen environment decreased wear of pure Fe while oxygen in additional to water increased the wear. Sliding of pure Fe consumed water when a hydrogen environment contained only water while it produced water and consumed oxygen when the environment contained both water and oxygen. The number of water molecules consumed by sliding in a hydrogen environment with water more than 5,000 ppb and without oxygen was larger than the estimated number of nascent Fe atoms by sliding. This suggests that multi-layer adsorption of water molecules decreased the wear of pure Fe.
著者
Yuki Hamasaki Naotoshi Nakashima Yasuro Niidome
出版者
(社)日本化学会
雑誌
Chemistry Letters (ISSN:03667022)
巻号頁・発行日
vol.42, no.9, pp.1093-1095, 2013-09-05 (Released:2013-09-05)
参考文献数
19
被引用文献数
4

Electrochemical oxidation of silver shells on gold nanorods was examined using in situ spectroscopy and scanning electron microscopy. The oxidation, in a phosphate buffer solution, was suppressed because of the formation of Ag3PO4. In contrast, oxidation in a KCl solution occurred at the corners of the nanorods and proceeded until giving gold nanorods without silver shells. After the 10-s electrolysis, nanoparticles with different shapes were found on the electrode. The inhomogeneous oxidation was due to rapid oxidation of the silver shells and occasional contact of the nanorods with the electrode surfaces.
著者
吉村 洋輔 石田 弘 小原 謙一 大坂 裕 伊藤 智崇 吉政 かおり 井上 かよ子 伊勢 眞樹 渡邉 進
出版者
公益社団法人 日本理学療法士協会
雑誌
理学療法学Supplement Vol.39 Suppl. No.2 (第47回日本理学療法学術大会 抄録集)
巻号頁・発行日
pp.Ab0417, 2012 (Released:2012-08-10)

【はじめに、目的】 人間は歩行中,両側の腕を無意識のうちに振っているが,これは単なる振り子運動ではなく,歩行を円滑に行うために中枢神経系に組み込まれた機構の一つであると考えられている.しかし,実際の生活の中では荷物を持つ,ポケットに手を入れて歩くなど腕を振らないで歩いていることも少なくはない.さらに臨床場面に目を向けると,高齢者や障害者では杖をつく必要があったり,上肢の機能障害のために腕を振れない状態にある者も少なくはない.また,近年では,下肢の振りに合わせて対側ではなく同側の上肢を振った方が歩行速度の改善や歩行耐久性の向上につながることも報告され,いくつかの実証例も存在する.歩行時の上肢の腕振りの状態が歩行動作の歩行率やエネルギー消費にどう影響するかを検討した報告は少なく,特に下肢の筋活動についての比較は見当たらない.ここでは歩行中の腕振りの状態が下肢筋活動にどのような影響を及ぼすかを明らかにすることにより,今後の歩行指導に役立てることを目的とした.【方法】 対象は研究の趣旨に同意を得られた健常成人8名(平均年齢22.5±0.5歳,平均体重52.7±1.7kg)であり,男女の内訳は男性4名,女性4名であった.各自の快適速度にて10m平地歩行をした際の歩行速度を算出し,その速度にて (1)腕の振りを固定しない自由な歩行(以下,自由歩行群),(2)上肢を同側の大腿部に固定し,腕の振りを制限した歩行(以下,固定歩行群)をそれぞれトレッドミル上にて30分間行った.その後,それぞれの条件下での歩行時の右大腿直筋(以下,RF),右大腿二頭筋(以下,BF),右前脛骨筋(以下,TA),右外側腓腹筋(以下,GL)の筋活動を表面筋電計(キッセイコムテック社製,Vital Recorder 2)にて計測し,付属のソフトであるBIMUTAS IIにて解析を行った.なお,両群での筋活動をフットスイッチからの信号により立脚相と遊脚相に分けてそれぞれを比較した.なお,筋疲労の蓄積を考慮し,自由歩行群と固定歩行群の計測には3日以上の間隔をあけて実施した.筋活動の比較は各筋の最大随意収縮値を100%として正規化し%MVCとして3歩行周期分の平均にて比較検討した.統計学的解析には統計ソフトウェアSPSS 17.0 J for Windows(エス・ピー・エス・エス社製)を用いて,Wilcoxon符号順位和検定を行い,危険率5%未満をもって有意とした.【倫理的配慮、説明と同意】 対象者には事前に本研究の趣旨と目的を文書にて十分説明した上で協力を求め,同意書に署名を得た.【結果】 自由歩行群の30分トレッドミル歩行後のRF,BF,TA,GLの筋活動は,立脚相ではそれぞれ13.6±10.3(%),15.1±16.9(%),11.2±5.5(%),60.4±41.9(%)であり,遊脚相では12.4±14.0(%),18.4±14.3(%),22.7±6.8(%),15.4±9.0(%)であった.固定歩行群の30分歩行後のRF,BF,TA,GLの筋活動は,立脚相ではそれぞれ10.7±8.4(%),8.8±7.6(%),11.3±3.5(%),53.5±25.9(%)であり,遊脚相では6.1±4.2(%),12.0±5.2(%),20.7±6.8(%),18.2±21.6(%)であった.自由歩行群と固定歩行群の歩行後の各筋の筋活動の比較では,RFの立脚相では有意差を認めなかったが,遊脚相では有意差を認めた.BF,TAにおいては立脚相,遊脚相ともに有意差を認めなかったが,自由歩行群に比べ固定歩行群では筋活動が低値である傾向を認めた.GLでは両群間の立脚相においてその筋活動に有意差を認めた.【考察】 遊脚相におけるRFと立脚相におけるGLの筋活動は歩行周期の中で特にその働きが重要であるが,自由歩行群に比べ固定歩行群では,それらの筋活動において有意な低下を認めた.その他の筋の活動においても,固定歩行群では低値を示す傾向にあった.長い時間の歩行においては,上肢の振りを下肢の振りに合わせた方が下肢筋への負荷や疲労が少ないことを示唆する結果となった.なんば歩行と呼ばれる腕振りを同側下肢の振り出しに合わせた歩行様式ではエネルギー消費や酸素摂取量が変化することも報告されており,陸上競技などでのコーチング内容として紹介されることも多い.さらに,日常場面や臨床場面では上肢の動きが制限される場面もある.また理学療法治療場面では,下肢筋力や筋持久力が低下している患者も多いが,そのような患者がある程度以上連続して行える歩行能力の獲得には腕振りの状態を考慮する必要があるといえる.【理学療法学研究としての意義】 連続歩行の際に腕振りを制限することによる下肢機能への影響を下肢筋活動の観点から示すことができた.筋力低下や廃用症候群などにより歩行障害を呈する患者への歩行練習を指導する際の基礎的資料となり得ることから,理学療法学研究としての意義があるものと考えられる.
著者
Kohei Shimoda Tsuyohiko Fujigaya Naotoshi Nakashima Yasuro Niidome
出版者
(社)日本化学会
雑誌
Chemistry Letters (ISSN:03667022)
巻号頁・発行日
pp.130457, (Released:2013-06-21)
被引用文献数
3

Poly(N-isopropylacrylamide) (PNIPAM) was coated on gold nanorods (NRs) without forming aggregates. The PNIPAM-coated NRs (PNIPAM-NRs) formed aggregates at higher temperature than the lower critical solution temperature (LCST) of the PNIPAM layers. The aggregation showed reversible spectroscopic responses under repeated temperature cycles. When near infrared (near-IR) light irradiated a PNIPAM-NR solution, the temperature raise up, and formed aggregates that showed broad and weak surface plasmon bands. The spectroscopic responses in near-IR region work as a negative feedback for heating a photoirradiated nanorod solution. The feedback offers spontaneous temperature control of the photoirradiated solution at LCST of PNIPAM.
著者
Tsuneo Watanabe Nobuo Terabayashi Bateer Shi Sohee Shin Kosho Kasuga Tamotsu Yabumoto Katsuji Shimizu Toshio Matsuoka
出版者
一般社団法人日本体力医学会
雑誌
The Journal of Physical Fitness and Sports Medicine (ISSN:21868131)
巻号頁・発行日
vol.2, no.2, pp.243-250, 2013-05-25 (Released:2013-06-21)
参考文献数
24
被引用文献数
1 3

The purpose of this study was to investigate the influence of cryotherapy on knee joint position sense (JPS) and intraarticular blood flow volume (IBFV) and evaluate their relationships with cooling time as well as with surface temperature and deep temperature. Ten healthy volunteers were examined. This study consisted of a same-subjects repeated-measures design, with the timeframe of cryotherapy application (no therapy [resting control group], 2-min cooling, or 15-min cooling intervention) after exercise being the independent variable, and IBFV, knee JPS, surface temperature, and deep temperature serving as the dependent variables. Dependent variables were examined before 10-min cycle ergometer exercise (baseline), post-exercise, post-cooling, and 15 min later. In the 15-min cooling group, IBFV immediately after cooling and 15 min later were significantly lower than the post-exercise values (P = 0.048 and 0.016, respectively), and knee JPS at 15 min later was significantly lower than the baseline value (P = 0.037). By contrast, the 2-min cooling group showed no significant changes in either knee JPS or IBFV. Although both surface and deep temperatures after cooling were significantly lower than baseline (P = 0.034 and P < 0.001, respectively) in the 2-min cooling group, 15 min later they were significantly higher than post-cooling values (P = 0.023 and 0.023, respectively). These results suggest that 15-min cooling interventions functionally impair the sensitivity of JPS, although cooling is suitable for reduction of IBFV in deep tissue. Cooling interventions lasting less than 2-min did not affect knee JPS; however no reduction of IBFV occurred during this timeframe.