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Nanomanufacturing and Metrology 2024年第2期7卷 76-88页

作者： motoya yoshikawa Saeko Fujii Shotaro Kadoya Tatsuya Sugihara Masaki Michihata Satoru Takahashi Department of Precision Engineering The University of TokyoHongo 7‑3‑1BunkyoTokyo 113‑8656Japan Department of Mechanical Engineering Osaka UniversityYamadaoka 2‑1SuitaOsaka 565‑0871Japan

This study proposes a model for the measurement of microscale liquid film thickness distribution using fluorescence *** interfacial conditions between the tool and the workpiece in mechanical machining are important for understanding these phenomena and *** this study,indentation tests with transparent tools were used to observe interfaces;however,it was challenging to obtain the signal from a thin fluorescent liquid film on smooth and steeply inclined ***,fluorescence-based measurement,such as laser-induced fluorescence,was *** measure the absolute thickness of the thin fluorescent film,calibration of the measurement system is ***,a theoretical model was proposed considering the multiple reflections of excitation light and fluorescence at the inclined surface between the indenter and *** measuring the profile of the surface topography of the indented workpiece and comparing the results with those measured by a surface profiler,the validity of the proposed calibration method and the performance of this measurement system were *** measured surface profiles,including scratches of 2–4μm,were in good agreement,demonstrating the validity of the proposed method.

关键词： Laser-induced fluorescence(LIF) Thickness distribution In-situ measurement Lubricant Mechanical machining

Freeze-thaw cycles and associated geomorphology in a post-glacial environment:current glacial,paraglacial,periglacial and proglacial scenarios at Pico de Orizaba volcano,Mexico

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Journal of Mountain Science 2024年第6期21卷 1954-1977页

作者： Víctor SOTO Carlos M.WELSH R. Kenji yoshikawa Hugo DELGADO GRANADOS Centro de Ciencias de la Tierra Universidad VeracruzanaCircuito Gonzalo Aguirre BeltránS/NZona Universitaria91090XalapaMéxico Water and Environmental Research Center University of Alaska FairbanksFairbanksAlaska 99775USA Instituto de Geofísica Universidad Nacional Autónoma de MéxicoCiudad de México 04150México Department of Earth and Environmental Sciences Ludwig Maximilians UniversitätMunich 80333Germany

The glacial history of Pico de Orizaba indicates that during the Last Glacial Maximum,its icecap covered up to~3000 m asl;due to the air temperature increasing,its main glacier has retreated to 5050 m *** retraction of the glacier has left behind an intense climatic instability that causes a high frequency of freeze-thaw cycles of great intensity;the resulting geomorphological processes are represented by the fragmentation of the bedrock that occupies the upper parts of the *** is a notable lack of studies regarding the fragmentation and erosion occurring in tropical high mountains,and the associated geomorphological risks;for this reason,as a first stage of future continuous research,this study analyzes the freezing and thawing cycles that occur above 4000 m asl,through continuous monitoring of surface ground *** results allow us to identify and characterize four zones:glacial,paraglacial,periglacial and *** was found that the paraglacial zone presents an intense drop of temperature,of up to~9℃ in only sixty *** rock fatigue and intense freeze-thaw cycles that occur in this area are responsible for the high rate of rock disintegration and represent the main factor of the constant slope dynamics that occur at the *** activity decreases,both in frequency and intensity,according to the distance to the glacier,which is where the temperature presents a certain degree of stability,until reaching the proglacial zone,where cycles are almost non-existent,and therefore there is no gelifraction *** geomorphological processes have resulted in significant alterations to the mountain slopes,which can have severe consequences in terms of risk and water.

关键词： Freeze-Thaw Gelifraction Mountain mechanical erosion Periglacial geomorphology Postglacial scenarios

Critical analysis of the ULF power depression as a possible Tohoku earthquake precursor

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Earthquake Science 2024年第5期37卷 407-414页

作者： Vyacheslav A Pilipenko Valery A Martines-Bedenko Akimasa yoshikawa Kirolosse M Girgis Institute of Physics of the Earth MoscowRussia International Research Center for Space and Planetary Environmental Science(i-SPES) Kyushu UniversityFukuoka 819-0395Japan

Among electromagnetic methods of short-term earthquake prediction,an approach is being actively developed based on the phenomenon of magnetic ultra-low-frequency(ULF)power depression occurring a few days before an *** particular,a nighttime geomagnetic power depression in the band 0.03-0.05 Hz was observed approximately 5 days before the catastrophic Tohoku 2011 *** verify the reliability of this method,we performed an extended analysis using data from magnetometer arrays JMA,MAGDAS,PWING,and *** selected stations included sites close to the epicenter(<300 km)and remote points(~10000 km).The band-integrated spectral power of nighttime magnetic noise decreased significantly from March 6-9,several days before the ***,such variations occur simultaneously not only at nearby stations but also at distant *** this event,the ULF power depression was caused by low global geomagnetic activity,as evidenced by the planetary index ***,the depression of geomagnetic ULF noise cannot be considered a reliable short-term precursor.

关键词： earthquake forecast seismo-electromagnetic phenomena ultra-low frequency(ULF)pulsations

Challenges of Bioethics Education in Pediatric Basic Nursing Education: A Faculty Perspective

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Health 2024年第2期16卷 105-117页

作者： Junko Nemoto Chikage Kubota Yukiko yoshikawa Faculty of Nursing Hyogo University Kakogawa Japan Department of Emergency Medical Science Suzuka University of Medical Science Suzuka Japan

In the field of pediatric nursing, in the perinatal period, numerous ethical issues arise alongside the advancement of medical technology. However, sufficient education on bioethics is not provided in the pediatric nursing domain of basic nursing education. The purpose of this research is to examine the current status of bioethics education in the pediatric nursing domain of basic nursing education and explore the challenges perceived by the pediatric nursing faculty regarding bioethics education. The research method was a questionnaire survey on 100 randomly selected pediatric nursing faculty members from nursing universities across Japan. The results revealed that although bioethics issues were considered important, the emphasis remained primarily on addressing bioethics as part of nursing that respects children’s rights. Furthermore, respondents expressed difficulties regarding teaching methods and content related to bioethics.

关键词： Basic Nursing Education Bioethics Education Pediatric Nursing

A Comprehensive Classification and Analysis of Geomagnetic Storms Over Solar Cycle 24

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Research in Astronomy and Astrophysics 2024年第8期24卷 75-84页

作者： Raja Adibah Raja Halim Shah Nurul Shazana Abdul Hamid Mardina Abdullah Adlyka Annuar Idahwati Sarudin Zahira Mohd Radzi Akimasa yoshikawa Department of Applied Physics Faculty of Science and TechnologyUniversiti Kebangsaan Malaysia43600 BangiMalaysia Space Science Centre(ANGKASA) Institute of Climate ChangeUniversiti Kebangsaan Malaysia43600 BangiMalaysia Department of Electrical Electronic and Systems EngineeringFaculty of Engineering and Built EnvironmentUniversiti Kebangsaan Malaysia43600 BangiMalaysia School of Physics Universiti Sains Malaysia11800 USMPulau PinangMalaysia Malaysian Space Agency(MYSA) Kuala Lumpur50480Malaysia International Research Center for Space and Planetary Environmental Science(i-SPES) Kyushu University819-0395 FukuokaJapan

A geomagnetic storm is a global disturbance of Earth?s magnetosphere,occurring as a result of the interaction with magnetic plasma ejected from the *** considerable research,a comprehensive classification of storms for a complete solar cycle has not yet been fully developed,as most previous studies have been limited to specific storm *** study,therefore,attempted to present complete statistics for solar cycle 24,detailing the occurrence of geomagnetic storm events and classifying them by type of intensity(moderate,intense,and severe),type of complete interval(normal or complex),duration of the recovery phase(rapid or long),and the number of steps in the storm?s *** analysis was applied to data from ground-based magnetometers,which measured the Dst index as provided by the World Data Center for Geomagnetism,Kyoto,*** study identified 211 storm events,comprising moderate(177 events),intense(33 events),and severe(1 event)*** 36%of ICMEs and 23%of CIRs are found to be geoeffective,which caused geomagnetic *** to four-step development of geomagnetic storms was exhibited during the main phase for this solar *** showed the geomagnetic storms developed one or more steps in the main phase,which were probably related to the driver that triggered the geomagnetic storms.A case study was additionally conducted to observe the variations of the ionospheric disturbance dynamo(Ddyn)phenomenon that resulted from the geomagnetic storm event of 2015July *** attenuation of the Ddyn in the equatorial region was analyzed using the H component of geomagnetic field data from stations in the Asian sector(Malaysia and India).The variations in the Ddyn signatures were observed at both stations,with the TIR station(India)showing higher intensity than the LKW station(Malaysia).

关键词： (Sun)sunspots-Sun activity-(Sun)solar-terrestrial relations-Sun coronal mass ejections(CMEs)

Study on the hydrothermal drying technology of sewage sludge

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Science China(Technological Sciences) 2010年第1期53卷 160-163页

作者： Kunio yoshikawa Tokyo Institute of Technology G5-84259 Nagatsuta-choMidori-kuYokohama 226-8502Japan

Drying of sewage sludge is an effective way for treatment and utilization of sewage sludge,where reduction of energy consumption is one of the major technical *** we experimentally investigated the possibility of the hydrothermal *** have found that treatment of sewage sludge by saturated steam with the temperature of 190°C and pressure of 20 bar can dramatically improve the dehydration performance of the slurry like *** the water content can be reduced down to about 55% by a mechanical *** natural drying 24 h it can be reduced down to about 20%.The final product is almost odorless and can easily be used for the refuse derived fuel(RDF).The sewage sludge product may be used as land-fill,or burned in a boiler or incinerator.

关键词： sewage sludge hydrothermal drying mechanical dehydration

Computer-generated holograms for 3D display(Invited Paper)

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Chinese Optics Letters 2009年第12期7卷 1079-1082页

作者： Hiroshi yoshikawa Takeshi Yamaguchi Department of Electronics and Computer Science Nihon University

We have been studying various types of computer-generated holograms for three-dimensional （3D） displays both for a real-time holographic video display and a hard copy, or a printed hologram. For the hard copy output, we have developed a direct fringe printer, which is achieved to print over 100 gigapixels computer-generated hologram with 0.44μm pitch. In this paper, we introduce our recent progresses on the rainbow hologram, the cylindrical holograms, and the disk hologram for 3D display.

关键词： Computer-generated holograms for 3D display Figure

Optimization of the gain in Yb^(3+)-doped cubic laser crystals of 99.99% purity

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Journal of Rare Earths 2009年第4期27卷 616-618页

作者： Georges Boulon Yannick Guyot Akira yoshikawa Physical Chemistry of Luminescent Materials University Claude Berna rd/Lyon1 UMR 5620 CNRS Bt.A.Kastler Domaine Scientifique de La Doua 69622 Villeurbanne France IMRAM Tohoku University 2-1-1 Katahira Aoba-ku Sendai 980-8577 Japan

This was an outlook on the prediction of the infrared laser potentiality from concentration dependences of the 2F5/2 experimental decay time in Yb3＋-doped solid-state crystals mainly on cubic crystals with 99.99% pur... 详细信息

关键词： ytterbium fluoride garnet sesquioxide laser crystals concentration quenching self trapping lifetime

Microwave enhanced stabilization of copper in artificially contaminated soil

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Frontiers of Environmental Science & Engineering 2011年第2期5卷 205-211页

作者： Hua ZHANG Zhiliang ZHU Noboru yoshikawa State Key Laboratory of Pollution Control and Resource Reuse Tongji UniversityShanghai 200092China Graduate School of Environmental Studies Tohoku UniversitySendai 980-8579Japan

Microwave processing was used to stabilize copper ions in soil *** effects on the stabilization efficiency were studied as a function of additive,microwave power,process time,and reaction *** stabilization efficiency of the microwave process was evaluated based on the results of the toxicity characteristic leaching procedure(TCLP)*** results showed that the optimal experimental condition contained a 700W microwave power,20 min process time and 3 iron wires as the additive,and that the highest stabilization efficiency level was more than 70%.In addition,the different reaction atmospheres showed no apparent effect on the stabilization efficiency of copper in the artificially contaminated *** to the result of the Tessier sequential extraction,the partial species of copper in the contaminated soil was deduced to transform from unstable species to stable states after the microwave process.

关键词： microwave copper stabilization

Characteristics of Transient Vortices in the Boundary Layer on a Rotating Disk under Orbital Motion

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Journal of Thermal Science 2013年第6期22卷 600-605页

作者： Mizue Munekata Naoya Jobi Keiichiro Kubo Hiroyuki yoshikawa Department of Mechanical System Engineering Kumamoto University

The objective of this study is to experimentally examine the characteristics of transient vortices in the boundary layer on a disk undergoing both rotation and orbital motion. The velocity fluctuations on a rotating, orbiting disk （disk radius equal to orbital radius） are measured by the hot-wire method, and the effects of orbital motion on the transient vortices in the boundary layer are examined. When the ratio of the orbital speed to the speed of rotation is i-0.025, the interval of transient vortices depends on only the orbital radius, regardless of the directions of rota- tion and orbital motion. The rate of low-frequency disturbances increases as the orbital speed increases, and the vortices induced by these low-frequency disturbances travel over the disk and then develop in the region of in- creased velocity. Consequently, no vortices generated on a rotating disk under orbital motion are stationary rela- tive to the disk.

关键词： Boundary layer transition Transient vortex Rotating disk Velocity measurement Hot-wire ane-mometer