检索结果-南通市图书馆

High-temperature corrosion of sintered RE_(2)Si_(2)O_(7)(RE=Yb and Ho)environmental barrier coating materials by volcanic ash

引用

International Journal of Minerals,Metallurgy and Materials 2024年第7期31卷 1628-1638页

作者： Ayahisa Okawa Son Thanh Nguyen Tadachika Nakayama Thi-Mai-Dung Do Hisayuki Suematsu Shu Yin takuya hasegawa Tsuneo Suzuki Takashi Goto Koichi Niihara Institute of Multidisciplinary Research for Advanced Materials Tohoku UniversitySendai 980-8577Japan Department of Creative Engineering National Institute of TechnologyKushiro 084-0916Japan Extreme Energy-Density Research Institute Nagaoka University of TechnologyNagaoka 940-2188Japan Advanced Institute for Materials Research(WPI-AIMR) Tohoku UniversitySendai 980-8577Japan

Rare-earth silicates are promising environmental barrier coatings(EBCs)that can protect SiC_(f)/Si C_(m)substrates in next-genera tion gas turbine blades.Notably,RE_(2)Si_(2)O_(7)(RE=Yb and Ho)shows potential as an EBC due to its coefficient of thermal expansion(CTE)compatible with substrates and high resistance to water vapor corrosion.The target operating temperature for next-generation tur bine blades is 1400°C.Corrosion is inevitable during adhesion to molten volcanic ash,and thus,understanding the corrosion behavior o the material is crucial to its reliability.This study investigates the high-temperature corrosion behavior of sintered RE_(2)Si_(2)O_(7)(RE=Yb and Ho).Samples were prepared using a solid-state reaction and hot-press method.They were then exposed to volcanic ash at 1400°C for 224,and 48 h.After 48 h of exposure,volcanic ash did not react with Yb_(2)Si_(2)O_(7)but penetrated its interior,causing damage.Meanwhile Ho_(2)Si_(2)O_(7)was partially dissolved in the molten volcanic ash,forming a reaction zone that prevented volcanic ash melts from penetrating the interior.With increasing heat treatment time,the reaction zone expanded,and the thickness of the acicular apatite grains increased The Ca:Si ratios in the residual volcanic ash were mostly unchanged for Yb_(2)Si_(2)O_(7)but decreased considerably over time for Ho_(2)Si_(2)O_(7).Th Ca in volcanic ash was consumed and formed apatite,indicating that RE^(3+)ions with large ionic radii(Ho>Yb)easily precipitated apatit from the volcanic ash.

关键词： environmental barrier coating volcanic ash rare-earth disilicate corrosion

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A simple and novel effective strategy using mechanical treatment to improve the oxygen uptake/release rate of YBaCo_(4)O_(7+δ) for thermochemical cycles

引用

Journal of Materials Science & Technology 2021年第9期68卷 8-15页

作者： Tingru Chen Yusuke Asakura takuya hasegawa Teruki Motohashi Shu Yin Institute of Multidisciplinary Research for Advanced Material(IMRAM) Tohoku UniversitySendaiMiyagi980-8577Japan Department of Materials and Life Chemistry Kanagawa UniversityYokohama221-8686Japan

In recent years,oxygen storage materials(OSMs)have been widely used in many fields.It would be particularly important for researchers to design high-oxygen-uptake/release-rate materials.In this study,various synthesis processes were used to successfully synthesize YBaCo_(4)O_(7+δ)and comprehensively investigate their potential applications.Compa red with traditional solid-state reaction method and co-precipitation method,the results demonstrated that the utilization of mechanical ball milling treatment on co-precipitated precursors could lead to samples with reversible oxygen uptake/release under an oxidative atmosphere at low temperatures.The resultant materials exhibited fast oxygen absorption/desorption rate that could uptake/release oxygen directly to the equilibrium state within 9 min and20 min,respectively.The mechanochemically ball-milled sample possessed outstanding oxygen sto rage performance,which could be attributed to their small particle size,the active outer surface of particles,large specific surface area,and relatively low activation energy.Moreover,the ball-milled sample also exhibited excellent cycling stability during relatively short time spacing.TG results also demonstrated that the ball-milled samples could reversibly uptake/release 2.90 wt.%of excess oxygen(while only 0.70 wt.%for solid-state samples)by adjusting the ambient temperature under pure O_(2) atmosphere,which would make them promising candidates in various applications.This research demonstrated that mechanical treatment could be an effective strategy to tune the properties and oxygen storage capacity(OSC)performances of YBaCo_(4)O_(7+δ).

关键词： Oxygen storage materials Mechanical treatment YBaCo_(4)O_(7) Thermochemical cycles

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

SnO-SnO_(2) modified two-dimensional MXene Ti3C2Tx for acetone gas sensor working at room temperature

引用

Journal of Materials Science & Technology 2021年第14期73卷 128-138页

作者： Zijing Wang Fen Wang Angga Hermawan Yusuke Asakura takuya hasegawa Hiromu Kumagai Hideki Kato Masato Kakihana Jianfeng Zhu Shu Yin School of Material Science and Engineering Shaanxi Key Laboratory of Green Preparation and Functionalization for Inorganic MaterialsShaanxi University of Science and TechnologyXi'an710021China Institute of Multidisciplinary Research for Advanced Materials Tohoku UniversitySendai980-8577Japan The Institute of Scientific and Industrial Research(ISIR) Osaka University Mihogaoka 8-1IbarakiOsaka567-0047Japan

Acetone,as widely used reagents in industry and laboratories,are extremely harmful to the human.So the detection of acetone gas concentrations and leaks in special environments at room temperature is essential.Herein,the nanocomposite combining SnO-SnO_(2)(p-n junction)and Ti_(3)C_(2)T_(x) MXene was successfully synthesized by a one-step hydrothermal method.Because of the existence of a small amount of oxygen during the hydrothermal conditions,part of the p-type SnO was oxidized to n-type SnO_(2),forming in-situ p-n junctions on the surface of Sn O.The hamburger-like SnO-SnO_(2)/Ti_(3)C_(2)T_(x) sensor exhibited improved acetone gas sensing response of 12.1(R_(g)/R_(a))at room temperature,which were nearly 11 and 4 times higher than those of pristine Ti_(3)C_(2)T_(x) and pristine SnO-SnO_(2),respectively.Moreover,it expressed a short recovery time(9 s)and outstanding reproducibility.Because of the different work functions,the Schottky barrier was formed between the SnO and the Ti_(3)C_(2)T_(x) nanosheets,acting as a hole accumulation layer(HALs)between Ti_(3)C_(2)T_(x) and tin oxides.Herein,the sensing mechanism based on the formation of hetero-junctions and high conductivity of the metallic phase of Ti_(3)C_(2)T_(x) MXene in SnO-SnO_(2)/Ti_(3)C_(2)T_(x) sensors was discussed in detail.

关键词： p-n junction Ti_(3)C_(2)T_(x)MXene Nanocomposites Acetone gas sensor Room temperature sensing

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Variables associated with suicide ideation and plans in a Japanese population

引用

Health 2011年第5期3卷 276-287页

作者： takuya hasegawa Chiyoe Murata Tatsuya Noda Tomoko Takabayashi Takashi Ninomiya Shinya Hayasaka Toshiyuki Ojima 不详

The purpose of our study was to clarify variables associated with suicide ideation and plans in a Japanese population. We conducted a random-sampling survey on mental health and suicide using a self-administered questionnaire for Hamamatsu City residents aged 15-79 yrs between May and June, 2008. This included questions about gender, age, outpatient treatment, alcohol problems, depression, living ar-rangements, marital status, annual family income, industry types as well as suicide ideation and plans. The correlation between these variables and suicide ideation or plans was then analyzed with multiple logistic regression analysis by gender. A total of 1051 responded to this questionnaire (response rate, 53.9%). Variables statistically associated with suicide ideation in males included alcohol problems, depression, lower annual family income, and ac-commodations/eating/drinking services, while in females, the variables were younger age, outpatient treatment, depression, living alone, being single, being separated, lower annual family income, accommodations/eating/drinking services and unemployment. On the other hand, variables statistically associated with suicide plans in males were younger age, alcohol problems, depression, and lower annual family income, while in females they were younger age, alcohol problems, depression, being separated, lower annual family income, manufacturing, and accommodations/eating/drinking services. Ex-cept for industry types, variables associated with suicide ideation or plans were consistent with previous studies. The reason why workers engaging in manufacturing, or accommoda-tions/eating/drinking services were more likely to have suicide ideation or plans may be attributed to the structures and/or stresses unique to those industries.

关键词： Suicide Ideation Suicide Plans Variables

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Features of hepatocellular carcinoma in cases with autoimmune hepatitis and primary biliary cirrhosis

引用

World Journal of Gastroenterology 2009年第2期15卷 231-239页

作者： takuya Watanabe Kenji Soga Haruka Hirono Katsuhiko hasegawa Koichi Shibasaki Hirokazu Kawai Yutaka Aoyagi Department of Internal Medicine and Gastroenterology Medical Hospital The Nippon Dental University School of Life Dentistry at Niigata 1-8 Hamauracho Chu-o-ku Niigata 951-8580 Japan Department of Gastroen-terology Niigata University Graduate School of Medical and Dental Sciences 1-757 Asahimachi Chu-o-ku Niigata 951-8510 Japan

AIM: To characterize the clinical features of hepatocellular carcinoma (HCC) associated with autoimmune liver disease, we critically evaluated the literature on HCC associated with autoimmune hepatitis (AIH) and primary biliary cirrhosis (PBC). METHODS: A systematic review of the literature was conducted using the Japana Centra Revuo Medicina database which produced 38 cases of HCC with AIH (AIH-series) and 50 cases of HCC with PBC (PBC-series). We compared the clinical features of these two sets of patients with the general Japanese HCC population. RESULTS: On average, HCC was more common in men than in women with AIH or PBC. While many patients underwent chemolipiodolization (CL) or transcatheter arterial embolization (TAE) (AIH-series: P = 0.048 (vs operation), P = 0.018 (vs RFA, PEIT); PBC-series: P = 0.027 (vs RFA, PEIT), others refused therapeutic interventions [AIH-series: P = 0.038 (vs RFA, PEIT); PBC-series: P = 0.003 (vs RFA, PEIT)].Liver failure was the primary cause of death among patients in this study, followed by tumor rupture. The survival interval between diagnosis and death was fairly short, averaging 14 ± 12 mo in AIH patients and 8.4 ± 14 mo in PBC patients. CONCLUSION: We demonstrated common clinical features among Japanese cases of HCC arising from AIH and PBC.

关键词：自体免疫肝炎自体免疫肝疾病肝细胞癌胆汁

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Determination of the Dzyaloshinskii-Moriya interaction using pattern recognition and machine learning

引用

npj Computational Materials 2021年第1期7卷 198-204页

作者： Masashi Kawaguchi Kenji Tanabe Keisuke Yamada takuya Sawa Shun hasegawa Masamitsu Hayashi Yoshinobu Nakatani Department of Physics The University of TokyoTokyo 113-0033Japan Toyota Technological Institute Nagoya 468-8511Japan Department of Chemistry and Biomolecular Science Faculty of EngineeringGifu UniversityGifu 501-1193Japan University of Electro-Communications Tokyo 182-8585Japan

Machine learning is applied to a large number of modern devices that are essential in building an energy-efficient smart society.Audio and face recognition are among the most well-known technologies that make use of such artificial intelligence.In materials research,machine learning is adapted to predict materials with certain functionalities,an approach often referred to as materials informatics.Here,we show that machine learning can be used to extract material parameters from a single image obtained in experiments.The Dzyaloshinskii–Moriya(DM)interaction and the magnetic anisotropy distribution of thin-film heterostructures,parameters that are critical in developing next-generation storage class magnetic memory technologies,are estimated from a magnetic domain image.Micromagnetic simulation is used to generate thousands of random images for training and model validation.A convolutional neural network system is employed as the learning tool.The DM exchange constant of typical Co-based thin-film heterostructures is studied using the trained system:the estimated values are in good agreement with experiments.Moreover,we show that the system can independently determine the magnetic anisotropy distribution,demonstrating the potential of pattern recognition.This approach can considerably simplify experimental processes and broaden the scope of materials research.

关键词： pattern interaction system

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Ileo-ileal intussusception caused by lymphangioma of the small bowel treated by single-incision laparoscopic-assisted ileal resection

引用

World Journal of Gastroenterology 2017年第1期23卷 167-172页

作者： Atsushi Kohga Akihiro Kawabe Yuto hasegawa Kiyoshige Yajima takuya Okumura Kimihiro Yamashita Jun Isogaki Kenji Suzuki Akira Komiyama Division of Surgery Fujinomiya City General Hospital Division of Pathology Fujinomiya City General Hospital

Intraabdominal lymphangiomas are uncommon;additionally,those affecting the gastrointestinal tract are rare and account for less than 1%of cases.Intussusception caused by a cystic lymphangioma of the small bowel is extremely rare.The patient was a20-year-old woman who visited our emergency room with a complaint of abdominal pain.A computed tomography image revealed ileo-ileal intussusception with a leading hypovascular mass measuring 1 cm in a diameter.Single-incision laparoscopic-assisted ileal resection was performed.The surgical specimen consisted of a soft polycystic mass.Macroscopically,a pedunculated polyp with a convolutional pattern was found.Microscopically,the inner surfaces of the cysts were covered with a single layer of endothelial cells.On immunohistochemical examination,the endothelial cells were partially positive for D2-40 and CD34.Smooth muscle cells were also found around the cysts.The lesion was diagnosed as a cystic lymphangioma.Dozens of cases of small bowel lymphangiomas have previously been reported.Of these,cases with intussusception were very rare.This is the first case of small bowel intussusception due to lymphangioma treated by singleincision laparoscopic-assisted surgery.

关键词：摄取单个切口的帮助 laparoscopic 的外科淋巴管瘤

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Strategy for marker-assisted breeding,status of genetic linkage maps,and QTL for aquaculture species

Strategy for marker-assisted breeding,status of genetic link...

引用

2005水产科技论坛

作者： Nobuaki OKAMOTO Kanako FUJI Eriko OHARA takuya HARA Cecilia Castano SANCHEZ Takashi SAKAMOTO Akiyuki OZAKI M.R.M.COIMBRA Sok Kean KHOO Osamu hasegawa Faculty of Marine Science Tokyo University of Marine Science and TechnologyTokyoJapan Faculty of Marine Science Tokyo University of Marine Science and TechnologyTokyoJapan Faculty of Marine Science Tokyo University of Marine Science and TechnologyTokyoJapan Faculty of Marine Science Tokyo University of Marine Science and TechnologyTokyoJapan Faculty of Marine Science Tokyo University of Marine Science and TechnologyTokyoJapan Faculty of Marine Science Tokyo University of Marine Science and TechnologyTokyoJapan National Research Institute of Aquaculture Fisheries Research AgencyMieJapan Universidade Federal Rural de Pernambuco Recife-PEBrazil Laboratory of Cancer Genetics Van Andel Institute Michigan USA Kanagawa Prefectural Fisheries Research Institute KanagawaJapan

＜正＞Recent advanced techniques in molecular biology have facilitated the dissection of many genetic traits in animals. One of the most important tools of these techniques is genetic linkage maps based on DNA markers such as microsatellite markers. The genetic markers mapped on a linkage map can be used to analyze the quantitative trait loci （QTL） responsible for economically important traits such as disease resistance, growth, and fecundity. In addition, genetic linkage maps also facilitate the positional cloning of functional genes contributing to the quantitative traits. Mapping and identifying the genetic markers linked to economically important traits is critical for marker-assisted breeding. Marker-assisted breeding such as marker-assisted selection （MAS） and marker-assisted gene introgression （MAI） are highly expected to improve the selective breeding programs of aquaculture species. In this paper, we introduce a comprehensive strategy for selective breeding by integrating molecular markers, genetic linkage maps, and QTL data that have been reported in aquaculture species.

关键词： DNA marker genetic linkage map QTL marker-assisted breeding MAS MAI

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

フライアッシュを用いたコンクリ一トの中性化に及ぼす暴露条件の影響

引用

青岛理工大学学报 2009年第4期30卷 79-86页

作者：築地健阿部道彦安田正雪小山智幸千歩修鹿毛忠継長谷川拓哉工学院大学 (株)東洋建設九州大学北海道大学 (独)建築研究所

本報告はフライアッシュを使用したコンクリ一トの中性化についての測定結果を取りまとめたものである.シリ一ズⅠでは、暴露地、フライアッシュの種類、置換率における比較を行った.シリ一ズⅡでは、供試体の向き、設置場所、設置条件... 详细信息

本報告はフライアッシュを使用したコンクリ一トの中性化についての測定結果を取りまとめたものである.シリ一ズⅠでは、暴露地、フライアッシュの種類、置換率における比較を行った.シリ一ズⅡでは、供試体の向き、設置場所、設置条件、調合条件における比較を行った.その結果、シリ一ズⅠにおいては、屋外暴露の場合、地域による中性化の差はあまり見られず、屋内と屋外の中性化速度係数の比は既往の実態調査結果より小さくなり、また、同一水結合材比では、フライアッシュの種類による中性化の差は認められなかった。シリ一ズⅡでは、中性化速度係数は屋外に置いて屋根なしより屋根ありのほうが大きい値を示し、また、建物の南側より北側のほうが小さい値となった.

关键词：中性化屋外暴露置换率环境条件

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：