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EVOLUtION OF CREEP-FAtIGUE DAMAGE IN tYPE 304StAINLESS StEEL AND ItS DEtECtION BY ELECtRICALPOtENtIAL MEtHOD

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Acta Metallurgica Sinica(English Letters) 1998年第6期11卷 463-469页

作者： N.tada t.kitamura R.Ohtani E.Nakayama Kyoto Univ Kyoto Japan

Creep-fatigue test was carried out using smooth round bar specimens of type 304 stainless steel. Cavities and small cracks on the cross-section of the specimen were carefully observed by a scanning laser microscope. Moreover, direct current electrical potential method (DC-EPM) was applied in order to evaluate non-destructively the distribution of internal cracks. the distribution evaluated by DC-EPM agrees well with the actual one. (Edited author abstract) 9 Refs.

关键词： creep-fatigue cavity small crack type 304 stainless steel electrical potential method

火花辅助点火均质充气压缩着火的瞬态控制技术

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汽车与新动力 2016年第4期48卷 28-33页

作者： M.takazawa K.Komura t.kitamura 武涛

近几年,随着人们对减少CO2和其他温室气体排放的技术需求逐渐增加,汽油均质充气压缩着火(HCCI)燃烧方式已获得认可,该技术依靠稀薄燃烧实现低氮氧化物排放和高热效率。然而,汽油机HCCI对缸内温度变化的耐受度很低,因此,在瞬态工况下运... 详细信息

近几年,随着人们对减少CO2和其他温室气体排放的技术需求逐渐增加,汽油均质充气压缩着火(HCCI)燃烧方式已获得认可,该技术依靠稀薄燃烧实现低氮氧化物排放和高热效率。然而,汽油机HCCI对缸内温度变化的耐受度很低,因此,在瞬态工况下运行时易发生爆燃和失火。用1台四冲程自然吸气汽油直喷发动机验证了HCCI的瞬态控制,该发动采用可变气门正时和升程的电子控制系统,来优化HCCI的进排气。介绍了引入外部废气再循环的化学计量火花点燃与HCCI着火的切换控制,以及在HCCI运行范围内发动机负荷和转速的变化。

关键词：均质充气压缩着火火花点火辅助瞬态控制废气再循环

基于电子壳模型研制PZt的原子间相互作用势函数

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基于电子壳模型研制PZT的原子间相互作用势函数

Examining the Hypothesis of Common Factors Shared by Different Addictive Behaviors and Gender Effects on Propensity to Addiction type

第二届全国压电和声波理论及器件技术研讨会

作者： t.kitamura Y Umeno 尚福林 t.Shimada K.Wakahara 西安交通大学航天航空学院工程力学系

锆钛酸铅(PZt)晶体广泛地应用于制作铁电器件。为不断改进这类器件的性能和研制出具有优异性能的压电薄膜/压电低维结构,科研人员在对PZt材料的机械和电学行为尝试着原子尺度的大规模模拟研究。为此目的,需要描述PZt晶体的有效的原子间... 详细信息

锆钛酸铅(PZt)晶体广泛地应用于制作铁电器件。为不断改进这类器件的性能和研制出具有优异性能的压电薄膜/压电低维结构,科研人员在对PZt材料的机械和电学行为尝试着原子尺度的大规模模拟研究。为此目的,需要描述PZt晶体的有效的原子间相互作用势函数。本研究基于量子力学第一性原理计算结果,研制了四方体PbtiO3,PbZrO3和Pb(Zr0.5,ti0.5)O3晶体的经验电子壳势函数,并给出了它们的铁电态平衡晶格常数和原子位移量,以及弹性常数参数,从而使大规模原子论模拟研究成为可能。本文得到的三个势函数很好地再现了各自晶体的晶体结构与弹性常数。同时,给出了一个可以同时描述上述三个晶体的电子壳势函数,它成功地拟合了三类晶体的晶格参数,但是,其预测的部分弹性常数值与第一性原理计算值有一定误差。

关键词：锆钛酸铅分子动力学原子间相互作用电子壳模型第一性原理

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Open Journal of Medical Psychology 2024年第3期13卷 58-70页

作者： Masayo Uji Junko Watanabe toshinori kitamura Department of Clinical Psychology Human Development Education Graduate School of Education Hyogo University of Teacher Education Kat Japan Academic Skill Support Center Kumamoto Health Science University Kumamoto Japan kitamura Institute Mental Health tokyo Tokyo Japan

Background: From the two facts reported by previous research: 1) frequent co-occurrence of more than one addictive behavior, 2) childhood adversities identified as origins of different types of addictive behaviors, it is assumed that all types of addictive behaviors, regardless of substance, behavioral, or relationship, share common factors which have not yet been proven by epidemiological research. the Shorter PROMIS Questionnaire (SPQ) was previously developed to assess 16 types of addictive behaviors. Its factor structure, however, has not been fully investigated. Confirming the factor structure will enable us to hypothesize the common factor(s) shared by all, or if not all, most types of addictive behaviors. Aims: this study aimed at 1) examining the factor structure of the SPQ, 2) confirming the reliability of the questionnaire, and 3) examining the impacts of gender and age on each addictive behavior. Methods: Data obtained from 232 Japanese adults who completed all items of the SPQ were used for the analyses. After confirming the one-factor structure model for each of the 16 subscales, the validity of the one-factor structure of the SPQ was evaluated using Confirmatory Factor Analysis (CFA), by adapting 16 subscale scores as observed variables. If its validity was not confirmed, another model which showed better compatibility to the data was explored. the reliability of the SPQ as well as that of all 16 subscales was evaluated. Also, the impacts of gender and age on each subscale score were examined. Results: the one-factor structure for each of the 16 subscales was confirmed. the compatibility of the SPQ one-factor model was not acceptable. the best fit model was a bi-factor model in which one main factor was shared by all 16 subscales, and three factors were shared by some specific addictive behaviors. Male respondents were more likely than female respondents to show high scores in Alcohol, tobacco, Gambling, Sex, and Recreational Drugs, and low scores only

关键词： Addictive Behaviors Shorter PROMIS Questionnaire Confirmatory Factor Analysis

A Case Report of Kissing Molars Class II

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Open Journal of Stomatology 2024年第5期14卷 249-254页

作者： toshiyuki Inou Keiichi Uchida Keiko Kaneko Anna Fuji Nina Wakimoto tatsuo takaya Hiroyuki kitamura Hiroshi Mori Yuji Kurihara Department of Oral Diagnostics and Comprehensive Dentistry Matsumoto Dental University Hospital Shiojiri Japan Department of Oral and Maxillofacial Surgery School of Dentistry Matsumoto Dental University Shiojiri Japan

Kissing molars (KMs) is a condition of occlusal molar surfaces in a single follicular space with roots extending in opposite directions. Here, we have reported a case of KMs in a 58-year-old woman. the patient complained of pain in the right mandibular molar region and was diagnosed with KMs consisting of the right mandibular second and third molars. Because of the patient’s pain having subsided at the time of the visit and her unwillingness to undergo tooth extraction, the patient was followed up. KMs is classified into three classes (I-III) and is either true-KMs or pseudo-KMs and presents with or without cystic variants of dental follicles. the presents as true-KMs class II without a cystic variant. With reference to the literature and based on our analysis, the mean age of patients affected by this specific case of KMs is 31.7 years and unilateral KMs is relatively more common (85.7%). Histopathological findings of dentigerous cysts are more often indicated (42.9%). the treatment policy for KMs should therefore be based on the classification of KMs. Importantly, the focus should be on preserving the first and second molars as much as possible. the treatment approach, such as the employment of surgical removal or orthodontics, should be determined by considering the associated factors such as the crowns, tissues, and age of the patient.

关键词： Kissing Molars Mandibular Second Molar Mandibular third Molar Cone-Beam Computed tomography

Selective excitation of two-wave structure depending on crystal orientation under shock compression

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Science China(Physics,Mechanics & Astronomy) 2020年第11期63卷 59-71页

作者： QiLin Xiong takahiro Shimada takayuki kitamura ZhenHuan Li Department of Mechanics Huazhong University of Science&TechnologyWuhan 430074China Hubei Key Laboratory of Engineering Structural Analysis and Safety Assessment Wuhan 430074China Department of Mechanical Engineering and Science Kyoto UniversityKyoto 615-8540Japan

Single crystals subjected to shock compression exhibit responses with distinct two-wave structures for certain crystal ***,little is known to date regarding how the shock response depends on crystal orientation,and especially why the two-wave structure depends on the crystal *** this work,molecular dynamics simulations of shock compressions in copper single crystals are performed to investigate the orientation dependence of shock responses and the corresponding deformation *** copper single crystals with[001],[011],[012],and[123]crystal orientations along the depth direction are ***[011],[012],and[123]crystal orientations of copper single crystals show distinct two-wave structures in their shock responses,while such a two-wave structure in the shock response is not seen for those orientations having a[001]crystal *** potential causes are analyzed by considering the propagation velocities of both elastic and plastic *** develop a technique for identifying twin structures in face-centered cubic crystals and this technique can effectively identify the twin *** morphology of shock-induced defects(e.g.,dislocations and twins)shows the significant dependence of crystal orientation and the mechanisms behind these are discussed in ***,the Johnson-Cook constitutive model describing dynamic deformations at high temperatures and high strain rates is used to analyze the relationships between the shock responses and microscopic *** predictions of the Johnson-Cook constitutive model are consistent with the results of the molecular dynamics simulations.

关键词： orientation-dependent two-wave structure shock compression copper molecular dynamics

A variant form of autoimmune pancreatitis successfully treated by steroid therapy, accompanied by von Meyenburg complex

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World Journal of Gastroenterology 2009年第5期15卷 622-627页

作者： Hideaki Miura Shigehiro kitamura Haruki Yamada Department of Internal Medicine Social Insurance Central General Hospital 3-22-1 Hyakunin-cho Shinjuku-ku Tokyo 169-0073 Japan Department of Pathology Social Insurance Central General Hospital 3-22-1 Hyakunin-cho Shinjuku-ku Tokyo 169-0073 Japan

Diagnostic criteria for autoimmune pancreatitis （AIP） have been proposed and used clinically because, despite its unique clinicopathological features, AIP does not have disease-specific serological tests for confirmation. However, diagnosis of a patient with pancreatic lesions mimicking cancer who deviates from these diagnostic criteria is still difficult. We present herein a patient with a variant form of AIP successfully diagnosed by fine-needle biopsy, whose response to steroid therapy was excellent. A 55-year-old Japanese man was admitted to hospital because of jaundice and pancreatic head mass. AIP was considered as one of the differential diagnoses; however, as the patient showed neither pancreatic duct narrowing nor immunological abnormalities, he did not meet the Japanese diagnostic criteria for AIP. Histopathology of the pancreatic mass demonstrated abundant infiltration by lymphocytes and interstitial fibrosis, which suggested AIP. Immunoreaction to IgG4, which is supposed to be specific to AIP, was not observed; however, response to subsequent prednisolone therapy was good, with dramatic pancreatic head mass regression. Aside from the pancreatic head mass, diffusely spreading small lesions were observed throughout the liver. the likelihood of a potential association with extrapancreatic lesions of AIP was considered and led us to carry out a liver biopsy, which revealed biliary hamartoma, also called yon Meyenburg complex （VMC）. As IgG4-positive plasma cell infiltration was not demonstrated in the hamartomatous regions, the hepatic condition was thought to have occurred incidentally; however, to the best of our knowledge, this is the first report in which the association between AIP and VMC was investigated and discussed.

关键词： Autoimmune pancreatitis Diagnosticcriteria IgG4 Biliary hamartoma von Meyenburgcomplex

toner Display Based on Movement of tribo-electrically Charged Particles

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仪器仪表学报 2004年第S3期25卷 36-38+55页

作者： takashi kitamura Information and Image Sciences Department Japan Chiba University 263-8522 Faculty of Engineering

the mechanism of toner display based on an electrical movement of black and white charged particles has been investigated. two kinds of particles of black and white charged in the different electric polarity are enclosed in two ItO transparent electrodes using an insulating spacer. the particle movement is controlled by the external electric field applied between two transparent electrodes. the black toner is adhered on the electrode by an electrostatic force across the CtL to display a black image. the toners can be put back to the counter electrode by applying a reverse electric field, and a white image is formed. the black and white solid images are displayed by the switch of polarity of applied voltage in toner display cell. the polarity of charge and the value of charge to mass ratio of two particles were measured by observation of the particle separation on the surface-type electrodes and using q/m meter, respectively.

关键词： toner display Electronic paper Particle

A Nano-Cantilever Method for Crack Initiation at the Free Edge of the Cu/Si Interface in Nanoscale Components

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Acta Mechanica Solida Sinica 2016年第4期29卷 416-428页

作者： Xiaoyuan Wang Yabin Yan Qiang Wan takashi Sumigawa takayuki kitamura Institute of Systems Engineering China Academy of Engineering Physics Department of Mechanical Engineering and Science Kyoto University

Straight and Bent nano-cantilever specimens are respectively proposed to investigate the single-mode and mixed-mode crack initiation at the Cu/Si interface edge in nanoscale components. With a minute loading apparatus, all nanoscale samples are in situ loaded and observed. Numerical analysis is employed to acquire the critical interfacial stress distributions during crack initiation. the stress concentration regions near the edge of Cu/Si interface in all specimens are within the scale of 100 nm, and the critical normal and shear stresses have a circular relation in nanoscale components, which represents the fracture criterion of the interface in nanoscale components.

关键词： nanoscale cantilever interface crack initiation mixed mode thin film