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Fracture theory based on the concept of characteristic fracture length of materials

第二十届中国控制会议

作者： Kazuhisa Itou yasuhiko mutoh Katsutoshi Tamura Sophia University Kioicho 7-1Chiyoda-kuTokyo 102-8554Japan Sophia University Kioicho 7-1Chiyoda-kuTokyo 102-8554Japan Sophia University Kioicho 7-1Chiyoda-kuTokyo 102-8554Japan

＜正＞For SISO uncertain nonlinear system, we show how the problem of global robust stabilization via recursive design can be solved by using less conservative bounding functions. The system is assumed to have gain bounded unknown nonlinear functions with a semi-strict feedback structure. Moreover, by modifying a Lyapunov-like function, we extend the obtained controller to have a disturbance attenuation property.

关键词： nonlinear systems robust stabilization robust L2 gain disturbance attenuation Lyapunov-based recursive design

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Science China(Physics,Mechanics & Astronomy) 2009年第12期52卷 2041-2046页

作者： mutoh Yoshiharu Department of Safety Engineering Nagaoka University of Technology

Fracture theory is a classic,but not a well-dealt with,difficulty in solid mechanics. This paper has proposed the concept of characteristic fracture length of materials from the fact that fracture happens with area failure rather than point failure in materials. A unified theory is then proposed,which can be applied both to smooth and defected materials (whether with micro or macro defects). Brittle fracture tests with specimens of different sizes of holes are carried out to examine the fracture theory. It is found that the fracture stresses obtained by experiments agree well with those predicated by the presented fracture theory. Though the brittle fracture is the focus of the paper,the concept of characteristic length can be easily extended to fatigue or other failure problems.

关键词： fracture theory strength characteristic length size effect brittle fracture

FATIGUE LIFE PREDICTION OF SUS 630(H900) STEEL UNDER HIGH CYCLE LOADING

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Acta Mechanica Solida Sinica 2013年第6期26卷 584-591页

作者： Fengming Guo Miaolin Feng Defu Nie Jinquan Xu Md.Shahnewaz Bhuiyan Yoshiharu mutoh Department of Engineering Mechanics Shanghai Jiao Tong University Hefei General Machinery Research Institute Department of Systems Safety Nagaoka University of Technology

The fatigue life prediction of high strength steel SUS 630 （H900） under high cycle loading is conducted with consideration of a characteristic fatigue length of material. Based on the WShler curve of smooth materials, a modified method for fatigue life prediction is approached. The characteristic fatigue length of material under cyclic loading is associated with the polycrystalline material. Rather than the stress at a point, the average stress within the characteristic fatigue length is implemented for the fatigue life prediction. The method can be applied to both the smooth and the defected material. The fatigue life prediction is also verified experimentally by specimens with various small circular holes. Through the comparison, it is found that the method can be adopted to predict the fatigue lives with different size effects.

关键词： fatigue life size effect characteristic fatigue length small defect SUS 630 (H900) steel

Simple procedure for assessing diffuse subarachnoid hemorrhage successfully created using filament perforation method in mice

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Animal Models and Experimental Medicine 2024年第1期7卷 77-81页

作者： Tatsushi mutoh Ryota Tochinai Hiroaki Aono Masayoshi Kuwahara Yasuyuki Taki Tatsuya Ishikawa Department of Surgical Neurology Research Institute for Brain and Blood VesselsAkita Cerebrospinal and Cardiovascular CenterAkitaJapan Department of Aging Research and Geriatric Medicine Institute of DevelopmentAging and CancerTohoku UniversitySendaiJapan Department of Veterinary Pathophysiology and Animal Health Graduate School of Agriculture and Life SciencesThe University of TokyoTokyoJapan

The murine model of subarachnoid hemorrhage(SAH)is a valuable experimental tool for investigating molecular and cellular mechanisms,and the endovascular filament perforation technique can be used to simulate prominent pathophysiological features observed after human SAH;however,current validation methods for assessing an appropriate SAH model are ***,we introduce a simple procedure for se-lecting a mouse model of diffuse *** was induced in 24 mice using a standard filament perforation *** confirming survival at 24 h,SAH was scored 0-1 based on T2*-weighted images on whole-brain magnetic resonance imaging(MRI)and visual surveillance of the cisterna magna(CM)through the dura *** CM-based SAH grading correlated well with a reference parameter defined by extracted brain(r^(2)=0.53,p<0.0001).The receiver operating characteristic curve revealed a sensi-tivity of 85%and a specificity of 91%for detecting diffuse SAH,with a similar area under the curve(0.89±0.06[standard error of the mean])as the MRI-based grading(0.72±0.10,p=0.12).Our data suggest that confirming an SAH clot in the CM is a valuable way to select a clinically relevant diffuse SAH model that can be used in future experimental studies.

关键词： cisterna magna clot distribution filament perforation mouse model subarachnoid hemorrhage

Investigation of Experimental Con6guration for Electron Bernstein Wave Heating on LHD

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Plasma Science and Technology 2009年第4期11卷 430-438页

作者： Hiroe IGAMI Ryosuke IKEDA Hiromi TAKAHASHI Yasuo YOSHIMURA Takashi SHIMOZUMA Shin KUBO Hitoshi TANAKA Kazunobu NAGASAKI Takashi mutoh the LHD Experiment Group National Institute for Fusion Science 509-5292 Toki Japan Graduate School of Energy Science Kyoto University 606-8502 Kyoto Japan Institute of Advanced Energy Kyoto University 611-0011 Uji Japan

Investigation of experimental configuration for the electron Bernstein wave （EBW） heating by using the existing electron cyclotron heating （ECH） antennas on LHD was performed. By using an antenna installed in the lower port, direct oblique launching of the extraordinary （X-） mode from the high magnetic field side （HFS） is available. Since the parallel component of the refractive index （NIF） varies during propagation because of the inhomogeneity of the magnetic field, NH can be zero when the launched X-mode crosses the fundamental electron cyclotron resonance （ECR） layer even NⅡ is noonzero initially. In such a condition, if the electron density is above a certain level the obliquely launched X-mode can pass the fundamental ECR layer without being damped out and can be mode-converted to EBW that is absorbed at the Doppler shifted ECR layer. By using an antenna installed in the horizontal port, oblique launching from the lower magnetic field side （LFS） toward the over-dense plasma is available. Excitation of EBW via the mode conversion process of ordinary mode（O）-extraordinary mode（X）-electron Bernstein wave （B） is expected with the O-mode launching toward an appropriate direction. The O-X-B mode conversion rate and the region of power deposition were surveyed by varying the magnetic field strength and the launching direction. The results of the survey suggest that efficient heating in the core region is difficult by using the existing antenna. Rearrangement of the final mirror of the launching antenna may be needed.

关键词： LHD electron cyclotron heating (ECH) electron Bernstein wave (EBW),high density plasma

Co-infection with Neisseria mucosa in a patient with tuberculous otitis media

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Journal of Otology 2024年第1期19卷 1-4页

作者： Tatsuya Hioki Kazuaki Soejima Yuki Goto Makoto Sugiura Takumi Umemura Yoshimi Ishihara Yoshikazu mutoh Daisuke Sakanashi Hiroshige Mikamo Department of Clinical Laboratory Tosei General Hospital160 Nishioiwake-choSetoAichi489-8642Japan Department of Respiratory Medicine and Allergy Tosei General Hospital160 Nishioiwake-choSetoAichi489-8642Japan Department of Otolaryngology Tosei General Hospital160 Nishioiwake-choSetoAichi489-8642Japan Department of Infection Control Team Tosei General Hospital160 Nishioiwake-choSetoAichi489-8642Japan Department of Infectious Diseases Tosei General Hospital160 Nishioiwake-choSetoAichi489-8642Japan Department of Infection Prevention and Control Aichi Medical University Hospital1-1 YazakokarimataNagakuteAichi480-1195Japan Department of Clinical Infectious Diseases Aichi Medical University1-1 YazakokarimataNagakuteAichi480-1195Japan

Tuberculous otitis media(TOM) is a rare manifestation caused by Mycobacterium tuberculosis with low incidence rates among extrapulmonary tuberculosis cases. Diagnosis is often delayed because of the presence of several clinical manifestations and the high prevalence of secondary bacterial infections. Few reports have attributed secondary bacterial infections in patients with TOM to commensal Neisseria. Thus, understanding the pathogenic mechanisms and clinical features of commensal Neisseria is important, considering its recent presentation as an infection-causing pathogen. Neisseria mucosa is a commensal inhabitant in humans and is generally considered non-pathogenic but can cause infection in rare cases. Here, we report an atypical secondary infection caused by Neisseria mucosa in an 81-year-old woman with TOM being treated for pulmonary tuberculosis. Direct purulent otorrhea smear microscopy revealed no acid-fast bacilli using Ziehl-Neelsen staining, whereas the phagocytosis of gram-negative cocci by white blood cells was confirmed using Gram staining. Otorrhea culture revealed the growth of N. mucosa. Subsequently, M. tuberculosis infection in the otorrhea was identified using a culture-based method. Vigilance is critical for the early detection of TOM to prevent further complications. This report raises awareness regarding TOM and provides insight into the pathogenicity of N. mucosa in otitis media.

关键词： Commensal neisseria Miliary tuberculosis Mycobacterium tuberculosis Neisseria mucosa Tuberculous otitis media

Study of High Power ICRF Antenna Design in LHD

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Plasma Science and Technology 2010年第1期12卷 15-19页

作者： Hiroshi KASAHARA Tetsuo SEKI Kenji SAITO Ryuhei KUMAZAWA Takashi mutoh Goro NOMURA Fujio SHIMPO Shin KUBO Takashi SHIMOZUMA Yasuo YOSHIMURA Hiroe IGAMI Hiromi TAKAHASHI 赵燕平 Takuya OOSAKO Yuichi TAKASE National Institute for Fusion Science Institute of Plasma Physics Chinese Academy of Sciences University of Tokyo

In large helical device （LHD）, antenna loadings are different for minority ion cyclotron heating （MICH with 38.47 MHz） and mode-converted ion Bernstein wave heating （MC-IBW with 28.4 MHz）, and it is necessary to improve antenna loading with low heating efficiency to avoid arching on transmission line. To design a new ion cyclotron range of frequencies （ICRF） antenna in LHD, calculation for a simple antenna model is conducted using three-dimensional electrical magnetic code （high frequency structure simulator, HFSS） for an water loading as an imaginary plasma with low heating efficiency. At resonant frequencies, antenna loading is sensitive to strap width, and resonant frequencies are strongly related to strap height. There is no differences of RF current profile on the strap surface between resonant frequency and non-resonant frequency. The strap should be perpendicularly placed against the magnetic field line, since Faraday-shield angle will lead to a decrease in the effective antenna height.

关键词： ICRF minority heating mode conversion heating antenna design LHD

High Density Plasma Heating by EC-Waves Injected from the High-Field Side for Mode Conversion to Electron Bernstein Waves in LHD

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Plasma Science and Technology 2013年第2期15卷 93-96页

作者： Y.YOSHIMURA S.KUBO T.SHIMOZUMA H.IGAMI H.TAKAHASHI M.NISHIURA S.OGASAWARA R.MAKINO T.mutoh H.YAMADA A.KOMORI National Institute for Fusion Science 322-6 Oroshi-cho Toki 509-5292 Japan Dept. of Energy Science and Technology Nagoya Univ.Nagoya 464-8463 Japan

To realize an excitation of electron Bernstein waves （EBW） via mode conversion from X-mode waves injected from the high magnetic field side （HFS）, new inner-vessel mirrors were installed close to a helicM coil in the large helicM device （LHD）. 77 GHz electron cyclotron （EC） wave beams injected from an existing EC-wave injection system toward the new mirror are reflected on the mirror so that the beams are injected to plasmas from HFS. Evident increases in the electron temperature at the plasma core region and the plasma stored energy were observed by the HFS beam injection to the plasmas with the line-average electron density of 7.5~ 1019 m-3, which is slightly higher than the plasma cut-off density of 77 GHz EC-waves, 7.35~ 1019 m-3. The heating efficiency evaluated from the changes in the time derivative of the plasma stored energy reached ,,~70%. Although so far it is not clear which is the main cause of the heating effect, the mode-converted EBW or the X-mode wave itself injected from the HFS, an effective heating of high-density plasma over the plasma cut-off of EC-wave was successfully demonstrated.

关键词： electron Bernstein wave EBW slow X-B overdense high density plasmaheating high-field side injection ECH LHD

Measurement of Ion Cyclotron Emissions by Using High-Frequency Magnetic Probes in the LHD

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Plasma Science and Technology 2013年第3期15卷 209-212页

作者： Kenji SAITO Ryuhei KUMAZAWA Tetsuo SEKI Hiroshi KASAHARA Goro NOMURA Fujio SHIMPO Hiroe IGAMI Mitsutaka ISOBE Kunihiro OGAWA Kazuo TOI Masaki OSAKABE Masaki NISHIURA Tsuguhiro WATANABE Satoshi YAMAMOTO Makoto ICHIMURA Takashi mutoh National Institute for Fusion Science Graduate School of Engineering Nagoya University Institute of Advanced Energy Kyoto University Tsukuba University Plasma Research Center

Two pairs of high-frequency magnetic probes were installed in the Large Helical Device （LHD）. During the injection of a perpendicular neutral beam, ion cyclotron emissions （ICEs） with the fundamental frequency corresponding to the ion cyclotron frequency at the plasma edge were detected, which are the same type of ICE as measured with the former spare ion cyclotron range of frequencies （ICRF） heating antennas. This type of ICE was further investigated with regard to the phase and intensity of signals. Another type of ICE was found in the LHD, and these ICEs were synchronized with bursts of toroidicity induced Alfv^n eigenmodes （TAE） and the rise of intensity of lost ion flux. Therefore the source of these ICEs was thought to be the particles transferred from the core to the outer region of plasma by the TAE bursts. The frequency of ICEs induced by the TAE bursts increases linearly with the magnetic field strength, since the ion cyclotron frequency increases with the magnetic field strength.

关键词： LHD ICE TAE lost particle high-frequency magnetic probe