检索结果-南通市图书馆

HIGH CYCLE FATIGUE PROPERTIES OF NICKEL-BASE ALLOY 718

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2004年第4期17卷 345-349页

作者： K.kobayashi K.Yamaguchi M.Hayakawa M.Kimura National Institute for Materials Science Tsukuba Ibaraki 305-0047 JapanNational Institute for Materials Science Tsukuba Ibaraki 305-0047 JapanNational Institute for Materials Science Tsukuba Ibaraki 305-0047 JapanNational Institute for Materials Science Tsukuba Ibaraki 305-0047 Japan

The fatigue properties of nickel-base Alloy 718 with fine- and grain-coarse grains were investigated. In the fine-grain alloy, the fatigue strength normalized by the tensile strength was 0.51 at 107 cycles. In contrast, the fatigue strength of the coarse-grain alloy was 0.32 at the same cycles, although the fatigue strengths in the range from 103 to 105 cycles are the same for both alloys. The fracture appearances fatigued at around 106 cycles showed internal fractures originating from the flat facets of austenite grains for both alloys. The difference in fatigue strength at 107 cycles between the fine- and coarse-grain alloys could be explained in terms of the sizes of the facets from which the fractures originated.

关键词： aerospace material fatigue high temperature internal fracture,facet

Research Activities of Nanodimensional Standards Using Atomic Force Microscopes,Transmission Electron Microscope,and Scanning Electron Microscope at the National Metrology Institute of Japan

在线全文

学校读者我要写书评

暂无评论

Nanomanufacturing and Metrology 2022年第2期5卷 83-90页

作者： Ichiko Misumi Ryosuke Kizu Hiroshi Itoh Kazuhiro Kumagai Keita kobayashi Tomoo Sigehuzi National Institute of Advanced Industrial Science and Technology AIST Tsukuba Central 51-1-1 HigashiIbaraki305-8565TsukubaJapan

With the progress in nanotechnology,the importance of nanodimensional standards is *** nanodimensional standards requires multiple types of high-precision microscopy *** National Metrology Institute of Japan(NMIJ),one of the research domains in the National Institute of Advanced Industrial Science and Technology(AIST),is developing nanodimensional standards using atomic force,transmission electron,and scanning electron *** current status of nanodimensional standards in NMIJ is introduced herein.

关键词： Nanodimensional standards Calibration Uncertainty AFM TEM SEM

Identifying key traits in high-yielding rice cultivars for adaptability to both temperate and tropical environments

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

The Crop Journal 2019年第5期7卷 685-693页

作者： Toshiyuki Takai Patrick Lumanglas Eliza Vie Simon Yumiko Arai-Sanoh Hidetoshi Asai Nobuya kobayashi Japan International Research Center for Agricultural Sciences TsukubaIbaraki 305-8686Japan International Rice Research Institute DAPO Box 7777Metro ManilaPhilippines Institute of Crop Science National Agriculture and Food Research Organization(NARO)TsukubaIbaraki 305-8518Japan

Increasing rice yield potential is a continuous challenge posed by world population *** increase yield potential,favorable alleles of valuable genes need to be accumulated in promising *** conducted comparative yield trials for two years in Tsukuba,Japan,in a temperate region and at the International Rice Research Institute(IRRI),Philippines,in a tropical region using five high-yielding rice cultivars:Takanari and Hokuriku193,developed in Japan,and IR64,NSIC Rc158,and YTH183,developed in the *** plus genotype×environment interaction(GGE)biplot analysis across four environments(two regions×two seasons)classified the five cultivars into four categories:Takanari and YTH183 showed high adaptability to both tropical and temperate regions,Hokuriku193 was suitable for temperate regions,NSIC Rc158 was suitable for the tropics,and IR64 was inferior to the other cultivars in both *** high yield and adaptability in Takanari and YTH183 were attributed to their large sink capacity with good grain *** plant type for high yield was different,however,between the two cultivars;Takanari was a panicle-weight type,whereas YTH183 was a panicle-number *** of F2 progeny of a cross between Takanari and YTH183 showed transgressive segregation for number of panicles per plant as well as number of spikelets per panicle,leading some F2 plants to produce more spikelets per plant(corresponding to larger sink size)than the parental cultivars in both *** results suggest the possibility of developing rice cultivars with high yield potential in both temperate and tropical regions by crossing temperate with tropical high-yielding cultivars.

关键词： Adaptability Genotype×environment interaction Rice Sink capacity Yield potential

5′-Hydroxyzearalenol,a new β-resorcylic macrolide from Fusarium sp. 05ABR26

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2008年第9期19卷 1089-1092页

作者： Ling Ling Zhao Yue Gai Hisayoshi kobayashi Chang Qi Hu Hui Ping Zhang Department of Natural Products Chemistry School of Pharmacy Fudan University Shanghai 200032 China Institute of Molecular and Cellular Biosciences The University of Tokyo Tokyo 113-0032 Japan

A new β-resorcylic macrolide, 5＇-hydroxyzearalenol （1）, was isolated from the culture broth of a marine-derived fungus Fusarium sp. 05ABR26. Three known compounds, zearalenone （2）, 8＇-hydroxyzearalenone （3） and zearalenol （4） were also isolated. The structure and relative stereochemistry of 1 were elucidated on the basis of spectroscopic data and single-crystal X-ray diffraction data. Compound 2 displayed potent inhibitory activity against Pyricularia oryzae with a MIC value of 6.25 μg/mL, while compound 3 was much less active; however, 1 and 4 showed no obvious activity.

关键词： 5'-Hydroxyzearalenol Fusarium sp. X-ray diffraction data Pyricularia oryzae

Clinical usefulness of endoscopic ultrasonography for the evaluation of ulcerative colitis-associated tumors

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2015年第9期21卷 2693-2699页

作者： Kiyonori kobayashi Kana Kawagishi Shouhei Ooka Kaoru Yokoyama Miwa Sada Wasaburo Koizumi Research and Development Center for New Medical Frontiers Kitasato UniversitySchool of MedicineSagamiharaKanagawa 252-0380Japan Department of Gastroenterology Kitasato UniversitySchool of MedicineSagamihara 252-0380Japan

AIM:To evaluate the clinical usefulness of endoscopic ultrasonography(EUS) for the diagnosis of the invasion depth of ulcerative colitis-associated ***:The study group comprised 13 patients with 16 ulcerative colitis(UC)-associated tumors for which the depth of invasion was preoperatively estimated by *** lesions were then resected endoscopically or by surgical colectomy and were examined *** mean age of the subjects was 48.2 ± 17.1 years,and the mean duration of UC was 15.8 ± 8.3 *** lesions were treated by endoscopic resection and the other 14 lesions by surgical *** depth of invasion of UCassociated tumors was estimated by EUS using an ultrasonic probe and was evaluated on the basis of the deepest layer with narrowing or rupture of the colonic ***:The diagnosis of UC-associated tumors by EUS was carcinoma for 13 lesions and dysplasia for 3 *** invasion depth of the carcinomas was intramucosal for 8 lesions,submucosal for 2,the muscularis propria for 2,and subserosal for ***(69%) of the 16 lesions arose in the *** macroscopic appearance was the laterally spreading tumor-non-granular type for 4 lesions,sessile type for 4,laterally spreading tumor-granular type for 3,semipedunculated type(Isp) for 2,type 1 for 2,and type 3 for *** depth of invasion was correctly estimated by EUS for 15 lesions(94%) but was misdiagnosed as intramucosal for 1 carcinoma with high-grade submucosal *** 2 lesions treated by endoscopic resection were intramucosal carcinoma and dysplasia,and both were diagnosed as intramucosal lesions by ***:EUS provides a good estimation of the invasion depth of UC-associated tumors and may thus facilitate the selection of treatment.

关键词： Ulcerative colitis Colitis-associated tumor Diagno

Acquired amegakaryocytic thrombocytopenia previously diagnosed as idiopathic thrombocytopenic purpura in a patient with hepatitis C virus infection

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2017年第35期23卷 6540-6545页

作者： Shojiro Ichimata Mikiko kobayashi Kohei Honda Soichiro Shibata Akihiro Matsumoto Hiroyuki Kanno Department of Pathology Shinshu University School of Medicine Department of Medicine Shinshu University School of Medicine

We report the first case of a patient with hepatitis C virus(HCV) infection and idiopathic thrombocytopenic purpura(ITP), who later developed acquired amegakaryocytic thrombocytopenia(AAMT), with autoantibodies to the thrombopoietin(TPO) receptor(c-Mpl). A 64-year-old woman, with chronic hepatitis C, developed severe thrombocytopenia and was diagnosed with ITP. She died of liver failure. Autopsy revealed cirrhosis and liver carcinoma. In the bone marrow, a marked reduction in the number of megakaryocytes was observed, while other cell lineages were preserved. Therefore, she was diagnosed with AAMT. Additionally, autoantibodies to c-Mpl were detected in her serum. Autoantibodies to c-Mpl are one of the causes of AAMT, acting through inhibition of TPO function, megakaryocytic maturation, and platelet formation. HCV infection induces several autoantibodies. HCV infection might also induce autoantibodies to c-Mpl, resulting in the development of AAMT. This mechanism may be one of the causes of thrombocytopenia in patients with HCV infection.

关键词： Hepatitis C virus Acquired amegakaryocytic thrombocytopenia Anti-thrombopoietin receptor(c-Mpl) autoantibodies Idiopathic thrombocytopenic purpura Thrombocytopenia

Primary hepatic neuroendocrine neoplasm diagnosed by somatostatin receptor scintigraphy:A case report

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2022年第7期10卷 2222-2228页

作者： Miho Akabane Yuta kobayashi Keiichi Kinowaki Satoshi Okubo Junichi Shindoh Masaji Hashimoto Division of Hepatobiliary-pancreatic Surgery Department of Gastroenterological SurgeryToranomon HospitalTokyo 105-8470Japan Department of Diagnostic Pathology Toranomon HospitalTokyo 105-8470Japan

BACKGROUND Primary hepatic neuroendocrine neoplasm(NEN)is a rare condition,and it is difficult to differentiate between primary and metastatic hepatic ***,we report a case of primary hepatic NEN that initially mimicked a hemangioma but showed a gradual increase in size on long-term careful *** SUMMARY A 47-year-old woman was incidentally diagnosed with a 12-mm liver mass,suspected to be a *** then,regular follow-up had been carried *** years later,she was referred to our institute due to the tumor(located in segment 4)having increased to 20 *** imaging studies depicted no apparent extrahepatic *** emission tomography(PET)/computed tomography exhibited significant accumulation in the mass lesion,which made us consider the possibility of *** hepatectomy was *** histopathological diagnosis was neuroendocrine tumor grade 2,with somatostatin receptor 2 a/5 *** somatostatin receptor scintigraphy(SRS)showed no other site,leading to the diagnosis of NEN of primary hepatic *** gradual growth of the hepatic NEN over 10 years suggested that it was likely to be a primary liver *** In this case,positivity on PET and postoperative SRS may have helped determine whether the tumor was primary or metastatic.

关键词： Hepatic neoplasm Scintigraphy Surgery Positron-emission tomography Clinical decision-making Case report

Eustachian tube involvement in a patient with relapsing polychondritis detected by magnetic resonance imaging:A case report

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2022年第4期10卷 1441-1446页

作者： Daisuke Yunaiyama Akiko Aoki Hiroshi kobayashi Miwako Someya Mitsuru Okubo Kazuhiro Saito Department of Radiology Tokyo Medical University HospitalShinjuku-ku 160-0023TokyoJapan Department of Radiology Tokyo Medical University Hachioji Medical CenterHachioji-shi 193-0998Japan Department of Rheumatology Tokyo Medical University Hachioji Medical CenterHachioji-shi 193-0998Japan Department of Otorhinolaryngology Head and Neck SurgeryTokyo Medical University Hachioji Medical CenterHachioji-shi 193-0998Japan

BACKGROUND Relapsing polychondritis(RP)is a rare inflammatory disease involving the systemic cartilage,such as the auricle,trachea,and bronchiole,among others.A patient with RP shows variable symptoms based on the involved *** SUMMARY A 72-year-old Japanese woman with a history of redness of the bilateral auricles for 3 d was referred to a *** clinician prescribed antibiotics to the patient;however,the symptoms worsened;thus,she was referred to our *** and neck magnetic resonance imaging(MRI)showed edematous auricle with remarkable contrast,fluid collection in the bilateral mastoid cells,suggesting otitis *** eustachian tube(ET)on the right side was also edematous with contrast *** patient was suspected of RP according to the diagnostic criteria.A biopsy of the auricular cartilage was performed by an otorhinolaryngologist,confirming pathological proof of *** with steroids were immediately administered *** We highlight a rare case of RP with radiologically confirmed involvement of ET in the MRI.

关键词： Relapsing polychondritis Magnetic resonance imaging Contrast enhancement Otitis media with effusion Eustachian tube Case report

Pitfalls and promises of bile duct alternatives:A narrative review

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2022年第39期28卷 5707-5722页

作者： Mitsuo Miyazawa Masayasu Aikawa Junpei Takashima Hirotoshi kobayashi Shunsuke Ohnishi Yoshito Ikada Department of Surgery Teikyo University Mizonokuch HospitalKanagawa 213-8507Japan Department of Surgery Saitama Medical University International Medical CenterSaitama 350-1298Japan Department of Gastroenterology and Hepatology Hokkaido University Faculty of Medicine and Graduate School of MedicineSapporo 060-8638Japan Department of Bioenvironmental Medicine Nara Medical UniversityNara 634-8521Japan

Biliodigestive anastomosis between the extrahepatic bile duct and the intestine for bile duct disease is a gastrointestinal reconstruction that abolishes duodenal papilla function and frequently causes retrograde *** chronic inflammation can cause liver dysfunction,liver abscess,and even bile duct *** research has been conducted for over 100 years to directly repair bile duct defects with alternatives,no bile duct substitute(BDS)has been *** narrative review confirms our understanding of why bile duct alternatives have not been developed and explains the clinical applicability of BDSs in the near *** searched the PubMed electronic database to identify studies conducted to develop BDSs until December 2021 and identified studies in *** independent reviewers reviewed studies on large animals with 8 or more *** types of BDSs prevail:Autologous tissue,non-bioabsorbable material,bioabsorbable material,and others(decellularized tissue,3D-printed structures,etc.).In most studies,BDSs failed due to obstruction of the lumen or stenosis of the anastomosis with the native bile *** has not been developed primarily because control of bile duct wound healing and regeneration has not been elucidated.A BDS expected to be clinically applied in the near future incorporates a bioabsorbable material that allows for regeneration of the bile duct outside the BDS.

关键词： Bile duct alternative Bile duct substitute Biliary regeneration Bile duct reconstruction Peribiliary gland Bioabsorbable polymer