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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(m)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

Fluorescence‑Based Calibration model for In‑Situ measurement of micro‑scaled Lubricant Thickness Distribution at Indentation Interface

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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

256层80kV多层螺旋CT及团注对比剂扫描3D减影血管成像评估颅内动脉瘤

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国际医学放射学杂志 2014年第1期 86-86页

作者： m.Kidoh T.Nakaura T.Ogata H.Takashima m.yoshikawa S.Uemura 王亚 Diagnostic Radiology Amakusa Medical Center kameba 854-1 Amakusa Kumamoto 863-0046Japan

目的评估256层多层螺旋CT在80 kV并团注对比剂条件下行颅内动脉减影三维CT血管成像(CTA)的价值。方法 32例病人应用100 kV,对比剂剂量为370 mgI/kg,

关键词： mDCT 颅内3D-CTA 低kV扫描影像质量团注对比剂

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

Glacial reconstruction and periglacial dynamics at the end of Late Pleistocene on the surface of Cofre de Perote volcano,méxico:a climatological retrospective

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Journal of mountain Science 2023年第9期20卷 2453-2467页

作者： Victor SOTO Hugo DELGADO-GRANADOS Carlos m.WELSH Kenji yoshikawa Centro de Ciencias de la Tierra Universidad VeracruzanaXalapaVeracruz 91090México Instituto de Geofísica Universidad Nacional Autónoma de MéxicoCiudad de México 04150México Water and Environmental Research Center University of Alaska FairbanksFairbanksAlaska 99775USA

Despite being within the intertropical region of the planet,the mexican territory still has glacier-covered *** recent decades,important advances have been made in studies on glaciology and periglacial environment in mexico both for current and past ***,in spite of Cofre de Perote volcano(4200 m a.s.l.)being a strategically located mountain,it has not yet been studied in regards to the glacial and periglacial processes;in fact,those dynamics have modified the mountain massifs in the *** complement the series of studies on glacial history in the high mountain environment of méxico,this study reconstructs the glacial cover and the periglacial environment of the volcano surface during the final stage of the Late Pleistocene based on climatic retrospective and through the identification of geomorphological *** findings indicate the existence of a large glacier(ice cap)that covered the northern,western,and southern slopes of the mountain;while in the eastern sector there were two small glaciers,one being of cirque type,and the other of valley *** current temperature conditions prevent the occurrence of permanent ice bodies;at the same time,it was found that the periglacial blockfields of the slopes is a legacy of the climatic conditions that prevailed at the end of Late Pleistocene.

关键词： Cofre de Perote Glacial cover Periglacial environment Climatic retrospective Palaeoclimatic modelling

InN-Based Ill-Nitrides; A New Emerging material System for Application in Optical Communications

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光学学报 2003年第S1期23卷 441-442页

作者： Ke Xu Akihiko yoshikawa Depaerment of Electronics and mechanical Engineering Chiba University JapanCREST JST1-33 Yayoi-cho Inage-ku Chiba 263-8522 JapanDepaerment of Electronics and Mechanical Engineering Chiba University Japan Center for Frontier Electronics and Photonics Chiba University VBL JapanCREST JST 1-33 Yayoi-cho Inage-ku Chiba 263-8522 Japan

The fact that InN has a direct bandgap of 0.75eV enables InN-based nitrides devices to cover the wavelength range from UV region to 1.8μm, therefore, emerging as a new material system for optical communication applic... 详细信息

关键词： InN-Based Ill-Nitrides mBE on GaN A New Emerging material System for Application in Optical Communications for in

Algicidal effect of bacterial isolates of Pedobacter sp. against cyanobacterium microcystis aeruginosa

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Water Science and Engineering 2012年第4期5卷 375-382页

作者： Li YANG Hiroto mAEDA Takeshi yoshikawa Gui-qin ZHOU College of Environment Hohai University College of Environment Nanjing University of Technology Laboratory of microbiology Faculty of FisheriesKagoshima University

The aim of this study was to isolate algicidal bacteria so as to control harmful cyanobacterium microcystis aeruginosa （m. aeruginosa） blooms using biological methods. Nine bacterial strains were isolated to inhibit the growth ofm. aeruginosa, among which the mail 1-5 bacterial strain exhibited remarkable algicidal activity against m. aeruginosa cells during the test. Based on the 16S rDNA analysis, the isolated mail 1-5 was identified as Pedobacter sp. through morphology and homology research. The results of cocultivation of the cyanobacteria with maI 11-5 algicidal isolates showed obvious algicidal activity against cyanobacterial cells. The algicidal effect of mail 1-5 exceeded 50% after two days, exceeded 70% after four days, and reached 80% after seven days. The observation results with a scanning electron microscope showed that the cyanobacterial cells aggregated and produced mucous-like substances when cocultivated with the algicidal bacteria. The results indicated that the mail 1-5 bacterial strain may possess a novel function for controlling harmful blooms and further studies will provide new insights into its role in water environment.

关键词： algicidal bacteria Pedobacter sp. algicidal effect microcystis aeruginosa

Long-term treatment with proton pump inhibitor is associated with undesired weight gain

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World Journal of Gastroenterology 2009年第38期15卷 4794-4798页

作者： Ichiro yoshikawa makiko Nagato masahiro Yamasaki Keiichiro Kume makoto Otsuki Third Department of Internal medicine University of Occupational and Environmental HealthJapanSchool of Medicine

AIm:To examine the effects of long-term proton pump inhibitor (PPI) therapy on body weight (BW) and body mass index (BmI) in patients with gastroesophageal reflux disease (GERD).mETHODS: The subjects were 52 patients with GERD and 58 sex-and age-matched healthy controls. GERD patients were treated with PPI for a mean of 2.2 years (range, 0.8-5.7 years), and also advised on lifestyle modifications (e.g. selective diet, weight management). BW, BmI and other parameters were measured at baseline and end of ***: Twenty-four GERD patients were treated daily with 10 mg omeprazole, 12 with 20 mg omeprazole, 8 with 10 mg rabeprazole, 5 with 15 mg lansoprazole, and 3 patients with 30 mg lansoprazole. At baseline, there were no differences in BW and BmI between reflux patients and controls. Patients with GERD showed increases in BW (baseline: 56.4±10.4 kg, end: 58.6±10.8 kg, mean±SD, PmI (baseline: 23.1±3.1 kg/m2, end: 24.0±3.1 kg/m2, Pmean BW increased by 3.5 kg (6.2% of baseline) in 37 (71%) reflux patients but decreased in only 6 (12%) patients during ***: Long-term PPI treatment was associated with BW gain in patients with GERD. Reflux patients receiving PPI should be encouraged to manage BW through lifestyle modifi cations.

关键词： Gastroesophageal reflux disease Protonpump inhibitor Body weight