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Online Monitoring of Welding Status Based on a DBN Model During Laser Welding

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Engineering 2019年第4期5卷 671-678页

作者： Yanxi Zhang Deyong You Xiangdong Gao seiji Katayama Guangdong Provincial Welding Engineering Technology Research Center Guangdong University of TechnologyGuangzhou 510006China Joining and Welding Research Institute Osaka UniversityOsaka 567-0047Japan

In this research,an auxiliary illumination visual sensor system,an ultraviolet/visible(UVV)band visual sensor system(with a wavelength less than 780 nm),a spectrometer,and a photodiode are employed to capture insights into the high-power disc laser welding *** features of the visible optical light signal and the reflected laser light signal are extracted by decomposing the original signal captured by the photodiode via the wavelet packet decomposition(WPD)*** captured signals of the spectrometer mainly have a wavelength of 400-900 nm,and are divided into 25 sub-bands to extract the spectrum features by statistical *** features of the plume and spatters are acquired by images captured by the UVV visual sensor system,and the features of the keyhole are extracted from images captured by the auxiliary illumination visual sensor *** on these real-time quantized features of the welding process,a deep belief network(DBN)is established to monitor the welding status.A genetic algorithm is applied to optimize the parameters of the proposed DBN *** established DBN model shows higher accuracy and robustness in monitoring welding status in comparison with a traditional back-propagation neural network(BPNN)*** effectiveness and generalization ability of the proposed DBN are validated by three additional experiments with different welding parameters.

关键词： Online monitoring Multiple sensors Wavelet packet decomposition Deep belief network

The mechanism of penetration increase in A-TIG welding

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Frontiers of Materials Science 2011年第2期5卷 109-118页

作者： Rui-Hua ZHANG Ji-Luan PAN seiji KATAYAMA Department of Mechanical Engineering Tsinghua University Beijing 100084 China Joining and Welding Research Institute Osaka University 11-1 Mihogaoka Ibaraki Osaka 567-0047 Japan

The mechanism of the increasing of A-TIG welding penetration is studied by using the activating flux we developed for stainless steel, The effect of fluxon the flow and temperature fields of weld pool is simulated by the PHOENICS software, It shows that without flux, the fluid flow will be outward along the surface of the weld pool and then down, resulting in a flatter weld pool shape. With the flux, the oxygen, which changes the temperature dependence of surface tehsion grads froma negative value toa positive value, can cause significant changes onthe Weld penetration. Fluid flow will be inward along the surface of the weld pool toward the center and then down. This fluid flow pattern efficiently transfers heat to the weld root and produces a relatively deep and narrow *** change is the main cause of penetration increase. Moreover, arc construction can cause the weld width to become narrower and the penetration to become deeper, but this is not the main cause of penetration increase. The effects Of flux on fluid flow of the weld pool surface and arc profiles were observed in conventiOnai TIG welding and in A-TIG welding by using high-speed video camera; The fluid flow behavior was visualized in realtime scale by micro focused X-ray transmission video observation system. The result indicated that stronger inward fluid flow patterns leading to weld beads with narrower width and deeper penetration could be apparently identified in the case of A-TIG *** flux couldchange the direction of fluid flow i-n welding pool. It has a good agreement with the simulation result.

关键词： A-TIG welding penetration increase, numerical simulation, X-ray, highspeed video camera

Role of atomic-scale thermal fluctuations in the coercivity

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npj Computational Materials 2020年第1期6卷 1084-1090页

作者： Yuta Toga seiji Miyashita Akimasa Sakuma Takashi Miyake National Institute for Materials Science(NIMS) Tsukuba 305-0047Japan Elements Strategy Initiative Center for Magnetic Materials(ESICMM) TsukubaJapan Institute for Solid State Physics University of TokyoKashiwa 277-8581Japan The Physical Society of Japan Tokyo 113-0033Japan Department of Applied Physics Tohoku UniversitySendai 980-8579Japan National Institute of Advanced Industrial Science and Technology(AIST) Tsukuba 305-8568Japan

The microscopic mechanism of coercivity at finite temperature is a crucial issue for permanent *** we present the temperature dependence of the coercivity of an atomistic spin model for the highest-performance magnet Nd_(2)Fe_(14)*** quantitative analysis of the magnetization reversal with thermal fluctuations,we focus on the free energy landscape as a function of the *** free energy is calculated by the replica-exchange Wang–Landau *** approach allows us to address a slow nucleation problem,i.e.,thermal activation effects,in the magnetization *** concretely observed that the thermal fluctuations lead to a downward convexity in the coercivity concerning the ***,through analyzing the microscopic process of the thermal activation(nucleation),we discover the activation volume is insensitive to a magnetic field around the *** insensitivity explains the linear reduction of the free energy barrier by the magnetic field in the nucleation process.

关键词： thermal activation magnetization

Seismicity,structure and tectonics in the Arctic region

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Geoscience Frontiers 2015年第5期6卷 665-677页

作者： Masaki Kanao Vladimir D.Suvorov Shigeru Toda seiji Tsuboi National Institute of Polar Research.Research Organization of Information and Systems Trofimuk Institute of Petroleum Geology and Geophysics of Siberian Branch Russian Academy of Sciences Department of Earth Sciences Faculty of EducationAichi University of Education Institute for Research on Earth Evolution Japan Agency for Marine-Earth Science and Technology

The "Arctic" region,where the North Pole occupies the center of the Arctic Ocean,has been affecting the environmental variation of the Earth from geological time to the ***,the seismic activities in the area are not adequately ***,by conducting long term monitoring of seismic phenomenon as sustainable parameters,our understanding of both the tectonic evolution of the Earth and the dynamic interaction between the cryosphere and geosphere in surface layers of the Earth will *** this paper,the association of the seismicity and structure of the Arctic region,particularly focused on Eurasian continent and surrounding oceans,and its relationship with regional evolution during the Earth’s history is *** target areas cover representative tectonic provinces in the Eurasian Arctic,such as the wide area of Siberia,Baikal Rift *** East Russia,Arctic Ocean together with Greenland and Northern *** on discussion including characteristics of seismicity,heterogeneous structure of the crust and upper mantle,tectonic history and recent dynamic features of the Earth’s surface in the Arctic are summarized.

关键词： Arctic region Seismicity Tectonics Earth’s structu

Predictive factors for efficacy of testosterone replacement therapy for late-onset hypogonadism in Japanese men:a preliminary report

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Asian Journal of Andrology 2023年第5期25卷 587-590页

作者： Nobuyuki Kondoh Yohei Kaizuka seiji Nagasawa Yoshikazu Togo Shingo Yamamoto Department of Urology Kawanishi City Medical CenterKawanishiHyogo 6660017Japan Department of Urology Hyogo Medical UniversityNishinomiyaHyog 6638501Japan

Although testosterone replacement therapy(TRT)is the first-choice method used worldwide for late-onset hypogonadism(LOH),clinical benefits are not seen in all *** study was conducted to determine the predictors of TRT efficacy for ***-six patients who visited our Men’s Health Clinic(Kawanishi City Medical Center,Kawanishi and Hyogo Medical University,Nishinomiya,Hyogo,Japan)between November 2003 and June 2021 with data available before and after TRT were *** were divided into responders(Group 1;n=45,accounting for 80.4%)and nonresponders(Group 2;n=11,accounting for 19.6%)based on the clinical response to TRT,including patient *** noted before TRT included age,body mass index,aging males’symptoms score,sexual health inventory for men,luteinizing hormone,follicular-stimulating hormone,testosterone,free testosterone,prolactin(PRL),estradiol(E2),and testosterone/estradiol(T/E2)ratio in *** statistical analysis,a multivariable logistic regression model was *** analysis revealed PRL(odds ratio TORI:0.9624;95%confidence interval[Cl]:0.9316-0.9943,P<0.05),E2(OR:0.8692;95%Cl:0.7745-0.9754,P<0.05),and T/E2 ratio(OR:1.1312;95%Cl:1.0106-1.2661,P<0.05)to be predictive *** analyses showed that T/E2 ratio was an independent predictive factor(OR:1.1593;95%Cl:1.0438-1.2875,P<0.01).The present results suggest that a low value for T/E2 ratio may predict a reduced response to *** T/E2 ratio threshold to predict nonresponders based on receiver-operating characteristics(ROC)curve analysis was shown to be *** additional studies with larger number of patients are necessary,we propose the determination of serum E2 level and testosterone level prior to performing TRT.

关键词： estradiol late-onset hypogonadism predictive factor testosterone treatment

Aerodynamic Study on Supersonic Flows in High-Velocity Oxy-Fuel Thermal Spray Process

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Journal of Thermal Science 2005年第2期14卷 126-129页

作者： Hiroshi KATANODA Takeshi MATSUOKA seiji KURODA Jin KAWAKITA Hirotaka FUKANUMA Kazuyasu MATSUO The University of Kitakyushu 1-1 Hibikino Wakamatsu-kuKitakyushuFukuoka808-0135 JapanTakagi Precision Dies Co. Ltd.2-4-1 IshidaminamiKokuraminami-kuKitakyushuFukuoka802-0836 JapanNational Institute for Materials Science 1-2-1SengenTsukubaIbaraki305-0047 JapanNational Institute for Materials Science 1-2-1SengenTsukubaIbaraki305-0047 JapanPlasma Giken Co. Ltd.2-1-12BijogiTodaSaitama335-0031 JapanThe University of Kitakyushu 1-1 HibikinoWakamatsu-kuKitakyushuFukuoka808-0135 Japan

To clarify the characteristics of gas flow in high velocity oxy-fuel (HVOF) thermal spray gun, aerodynamic research is performed using a special gun. The gun has rectangular cross-sectional area and sidewalls of optical glass to visualize the internal flow. The gun consists of a supersonic nozzle with the design Mach number of 2.0 followed by a straight passage called barrel. Compressed dry air up to 0.78 MPa is used as a process gas instead of combustion gas which is used in a commercial HVOF gun. The high-speed gas flows with shock waves in the gun and jets are visualized by schlieren technique. Complicated internal and external flow-fields containing various types of shock wave as well as expansion wave are visualized.

关键词：超声流冲击波热喷涂内流热处理

Applications of image analysis in plant chromosome and chromatin structure study

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Quantitative Biology 2022年第3期10卷 226-238页

作者： Nobuko Ohmido Astari Dwiranti seiji Kato Kiichi Fukui Graduate School of Human Development and Environment Kobe UniversityKobe 657-8501Japan Cellular and Molecular Mechanisms in Biological System(CEMBIOS)Research Group Department of BiologyFaculty of Mathematics and Natural SciencesUniversitas IndonesiaDepok CampusWest Java 16424Indonesia Graduate School of Pharmaceutical Sciences Osaka UniversitySuitaOsaka 565-0871Japan

Background:The use of image analysis to understand the structure of chromosome and chromatin is critical to the study of genetic evolution and ***,a detailed chromosome map and the structure of chromatin in the nucleus may contribute to the plant breeding and the study of fundamental biology and genetics in ***:In plants with a fully annotated genome project,such as the Leguminosae species,the integration of genetic information,including DNA sequence data,a linkage map,and the cytological quantitative chromosome map could further improve their genetic *** numerical parameters of chromocenters in 3D can provide useful genetic information for phylogenetic studies of plant diversity and heterochromatic markers whose epigenetic changes may explain the developmental and environmental changes in the plant *** DNA fibers combined with fluorescence in situ hybridization revealed the highest spatial resolution of the obtained genome ***,image analysis at the nano-scale level using a helium ion microscope revealed the surface structure of chromatin,which consists of chromatin fibers compacted into plant ***:The studies described in this review sought to measure and evaluate chromosome and chromatin using the image analysis method,which may reduce measurement time and improve ***,we discussed the development of an effective image analysis to evaluate the structure of chromosome and *** effective application study of cell biology and the genetics of plants using image analysis methods is expected to be a major propeller in the development of new applications.

关键词： CHIAS chromosome chromatin extended DNA fiber helium ion microscopy nucleus plants

Molecular Phylogeny and Evolution of Two Rhacophorus Species Endemic to Mainland Japan

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Asian Herpetological Research 2019年第2期10卷 86-104页

作者： Masafumi MATSUI Yasuhiro KAWAHARA Kanto NISHIKAWA seiji IKEDA Koshiro ETO Yusuke MIZUNO Graduate School of Human and Environmental Studies Kyoto UniversityYoshida Nihonmatsu-choSakyo-kuKyoto 606-8501Japan Hagi City Museum Horiuchi 355HagiYamaguchi 758-0057Japan Hiroshima University Museum Kagamiyama 1-1-1Higashi Hiroshima CityHiroshima 739-8524Japan Kitakyushu Museum of Natural History and Human History Higashida 2-4-1Yahatahigashi-kuKitakyushuFukuoka 805-0071Japan Takahari 4-1002 Meito-kuNagoya 465-0061Japan

We conducted molecular phylogenetic analyses of Japanese Rhacophorus species, especially of R. schlegelii and R. arboreus from the mainland, based on samples encompassing their known distribution ranges, and discussed about evolutionary history of Rhacophorus species within Japan. The common ancestor of Japanese Rhacophorus, except for R. owstoni from southern Ryukyus, was estimated to have diverged from a lineage occurring mainly in China about 7 MYBP. Both R. schlegelii and R. arboreus are genetically largely divergent between regions of eastern and western Japan, and this seems to have been promoted mainly by retreat to refugia. Retreats of the two species to different refugia sometimes in the past seem to have led restricted distribution of R. schlegelii in eastern and R. arboreus in western Japan, and brought their intraspecific variation patterns in morphology and breeding habit.

关键词： glacial period mitochondrial DNA differentiation refugia Rhacophorus arboreus Rhacophorus schlegelii

First principles calculation of stable structure and adhesive strength of plated Ni/Fe(100) or Cu/Fe(100) interfaces

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中国有色金属学会会刊：英文版 2009年第4期19卷 988-991页

作者： Ryota NAKANISHI Koji SUEOKA seiji SHIBA M akoto HINO Koji MURAKAMI Ken MURAOKA Department of System Engineering Okayama Prefectural University Metallic Materials Group Department of Mechanical EngineeringIndustrial Technology Center of Okayam a Prefecture

A study the with first principles calculation of the interfaces of the Ni layer or Cu layer on the Fe(100) surface formed with metal plating was *** or Cu atoms were shown to adopt the corresponding position to the bcc structure of the Fe(100) *** calculations showed that the interfaces of Ni(5 atomic layers)/Fe(100)(5 layers) or Cu(5 atomic layers)/Fe(100)(5 layers) had square *** orientation relationship of Ni/Fe(100) interface corresponds to fcc-Ni(100)//bcc-Fe(100),Ni[011]//Fe[010],and Ni[011]//Fe[001].Similar results were obtained for Cu/Fe(100) *** structure was supported by TEM analysis of plated Ni layer on Fe(100) *** adhesion strength of the Ni/Fe(100) interface evaluated by first principles calculation was higher than that of the Cu/Fe(100) *** experimental results of Hull cell iron plated with Ni or Cu supported the results of the *** results indicate that the first principles calculation,which deals with the ideal interface at the atomic scale,has the potential to evaluate the adhesion strength of metallic material interfaces.

关键词：第一原理计算接口处理稳定结构粘接强度铜原子镀镍胶粘剂界面结合强度