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Solar energetic particles intensity variations associated with a tilted-dipole 3D corotating interaction region

Earth and Planetary Physics 2024年第5期8卷 797-810页

作者： yuji Zhu Fang Shen Xi Luo Yang Wang BoFeng Tang State Key Laboratory of Space Weather National Space Science CenterChinese Academy of SciencesBeijing 100190China Shandong Institute of Advanced Technology(SDIAT) Jinan 250100China College of Earth and Planetary Sciences University of Chinese Academy of SciencesBeijing 100049China School of Science Harbin Institute of TechnologyShenzhen 518055China

The effect of a tilted-dipole three-dimensional corotating interaction region(CIR)on the transport and acceleration of solar energetic particles(SEPs)is *** this work,we discussed how the particle intensity longitudinal and radial dependence might be influenced by the background ***,we investigate how the spectral index distribution is modulated by the CIR structure We use the focused transport equation(FTE)to describe the propagation and acceleration of SEPs in a tilt-dipole 3D CIR,generated by the high-resolution 3D magnetohydrodynamic(MHD)*** forward stochastic differential method is used to solve the *** protons with theE~(-4.4)spectrum from 0.5 to 15 MeV are injected uniformly at the heliographic equator of 0.15 *** quantities are extracted along each interplanetary magnetic field(IMF)line to show the *** the tilted-dipole CIR background,if injected from the solar equator at the inner boundary,particles in the slow flow are transported to higher latitudes due to the extension of the IMF lines to higher *** longitudinal patterns of the particles are dominated by the density of IMF *** focusing effect modulates the longitudinal variation of the particle intensity and gives rise to new longitudinal intensity *** adiabatic effect largely increases the intensity fluctuation along the *** structure of the solar wind can also lead to the difference of the indexαin the empirical functionI_(max)=kR~(-α),describing the radial variation of peak intensity according to our *** the influence of the CIR structure,the indexαvaries from 1.9 to 3.4 at 0.3-1.0 *** variation of the solar wind speed should be considered when estimating the radial dependence of the SEP peak *** spectra indices rise near the CIR boundaries and drop near the stream interface(SI).The adiabatic effect makes the spatial variability of the spectral index *** spectral index could be similar at d

关键词： solar energetic particle(SEP) corotating interaction regions(CIR) magnetohydrodynamic(MHD)

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Clinical usefulness and current problems of pancreatic duct stenting for preventing post-ERCP pancreatitis

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World Journal of Clinical Cases 2014年第9期2卷 426-431页

作者： yuji Sakai Toshio Tsuyuguchi Osamu Yokosuka Department of Gastroenterology and Nephrology Graduate School of Medicine Chiba UniversityChiba 260-8677 Japan

Endoscopic retrograde cholangiopancreatography(ERCP) is an endoscopic procedure with high frequency of accidental symptoms, and particularly some patients who develop and aggravate pancreatitis due to the procedure may need treatment of surgery or die. Various attempts were performed so far to prevent post-ERCP pancreatitis, however, it is impossible to completely prevent pancreatitis at this time because there are various factors for occurrence of post-ERCP *** of the most frequent causes of post-ERCP pancreatitis is considered to be congestion of pancreatic juice associated with duodenal papilledema after examination or treatment. Recently it is often reported that use of a pancreatic duct stent may prevent occurrence of pancreatitis which occurs because of an increased inner pressure of the pancreatic duct caused by congestion of pancreatic juice associated with duodenal papilledema. However, there are some patients who develop pancreatitis even if treated with the pancreatic duct stent, thus further clarification of the pathology and advancement of the prophylactic method will be needed.

关键词： Endoscopic retrograde cholangiopancreatography Post-endoscopic retrograde cholangiopancreatography pancreatitis Pancreatic duct stent Pancreatic stenting

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Multispectral Phenotyping and Genetic Analyses of Spring Appearance in Greening Plant, Phedimus spp.

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Plant Phenomics 2023年第2期5卷 353-367页

作者： Taeko Koji Hiroyoshi Iwata Motoyuki Ishimori Hideki Takanashi yuji Yamasaki Hisashi Tsujimoto The United Graduate School of Agricultural Sciences Tottori University4-101 Koyamacho minamiTottori-shiTottori 680-8553Japan Graduate School of Agricultural and Life Sciences The University of Tokyo1-1-1 Yayoi-chouBunkyoTokyo 113-8657Japan Arid Land Research Center Tottori University1390 HamasakaTottori-shiTottori 680-0001Japan

The change in appearance during the seasonal transitions in ornamental greening plants is an important *** particular,the early onset of green leaf color is a desirable trait for a *** this study,we established a method for phenotyping leaf color change by multispectral imaging and performed genetic analysis based on the phenotypes to clarify the potential of the approach in breeding greening *** performed multispectral phenotyping and quantitative trait locus(QTL)analysis of an F1 population derived from 2 parental lines of Phedimus takesimensis,known to be a drought and heat-tolerant rooftop plant *** imaging was conducted in April of 2019 and 2020 when dormancy breakage occurs and growth extension *** component analysis of 9 different wavelength values showed a high contribution from the first principal component(PC1),which captured variation in the visible light *** high interannual correlation in PC1 and in the intensity of visible light indicated that the multispectral phenotyping captured genetic variation in the color of *** also performed restriction site-associated DNA sequencing and obtained the first genetic linkage map of Phedimus *** analysis revealed 2 QTLs related to early dormancy *** on the genotypes of the markers underlying these 2 QTLs,the F1 phenotypes with early(late)dormancy break,green(red or brown)leaves,and a high(low)degree of vegetative growth were *** results suggest the potential of multispectral phenotyping in the genetic dissection of seasonal leaf color changes in greening plants.

关键词： breeding cultivar visible

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Water Resource Development in the Quaternary Ryukyu Limestone Regions of Japan:Application of the GIS to the Site Selection of Underground Dams

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Acta Geologica Sinica(English Edition) 2001年第3期75卷 254-259页

作者： Kaijun JIANG Hiroyasu FURUKAWA yuji ONOYAMA Testuro ESAKI Underground Dam Research Group Showa-chika Kogyo Inc. Fukuoka Japan 815-0082Underground Dam Research Group Showa-chika Kogyo Inc. Fukuoka Japan 815-0082Underground Dam Research Group Showa-chika Kogyo Inc. Fukuoka Japan 815-0082Institute of Environmental Systems Kyushu University Fukuoka Japan 812-8581

Based on the natural and social conditions as well as hydrogeological characteristics of the Ryukyu limestone, a major aquifer in the Ryukyu Islands, a conception of underground dam, was proposed in the early 1970s in order to develop ground water resources in the Quaternary Ryukyu limestone regions of Japan. The practice of nearly thirty years has shown that the underground dam is an environment-friendly and effective way for developing ground water in these regions.

关键词： underground dam limestone Quaternary GIS ground water

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Exploitation of shape memory alloy actuator using resistance feedback control and its development

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Progress in Natural Science:Materials International 2010年第1期20卷 97-103页

作者： Hiroki CHO Takaei YAMAMOTO yuji TAKEDA Akihiko SUZUKI Toshio SAKUMA Faculty of Engineering Oita University700 DannoharuOita 870-1192Japan TAKE R&D 2-7-27UmedaKasukabeJapan

The relationship between phase transformation and electric resistivity of Ti-42.6Ni-7Cu SMA was *** the isothermal tensile tests,stress-strain curve shows large hysteresis and nonlinearity,whereas the resistivity-strain curve can be fitted by *** resistivity of SMAs can be determined from the volume fractions of the martensitic and austenitic *** characteristics leads to that the resistance of the SMAs is used as a parameter of strain of SMAs.A SMA actuator using resistance feedback control system was proposed,which can control and retain positioning at any positions without using sensor devices,and the deviation of position of this system was less than 3 μm.

关键词： Ti-Ni-Cu alloy shape memory alloy resistivity shape memory characteristics phase transformation

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Development of phenotyping system using low altitude UAV imagery and deep learning

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International Journal of Agricultural and Biological Engineering 2021年第1期14卷 207-215页

作者： Suxing Lyu Noboru Noguchi Ricardo Ospina yuji Kishima Graduate School of Frontier Sciences The University of TokyoKashiwa 277-8561Japan Graduate School of Agriculture Hokkaido UniversitySapporo 060-8589Japan Research Faculty of Agriculture Hokkaido UniversitySapporo 060-8589Japan

In this study,a lightweight phenotyping system that combined the advantages of both deep learning-based panicle detection and the photogrammetry based on light consumer-level UAVs was proposed.A two-year experiment was conducted to perform data collection and accuracy validation.A deep learning model,named Mask Region-based Convolutional Neural Network(Mask R-CNN),was trained to detect panicles in complex scenes of paddy fields.A total of 13857 images were fed into Mask R-CNN,with 80%used for training and 20%used for ***,precision,recall,Average Precision(AP),and F1-score of the Mask R-CNN,were 82.46%,80.60%,79.46%,and 79.66%,respectively.A complete workflow was proposed to preprocess flight trajectories and remove repeated detection and ***,the evident changed in rice growth during the heading stage was visualized with geographic distributions,and the total number of panicles was predicted before *** average error of the predicted amounts of panicles was 33.98%.Experimental results showed the feasibility of using the developed system as the high-throughput phenotyping approach.

关键词： panicle detection vision-based phenotyping deep learning unmanned aerial vehicle(UAV)

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A New Approach for Error Reduction in the Volume Penalization Method

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Communications in Computational Physics 2014年第10期16卷 1181-1200页

作者： Wakana Iwakami Yuzuru Yatagai Nozomu Hatakeyama yuji Hattori Yukawa Institute for Theoretical Physics Kyoto UniversityOiwake-choKitashirakawaSakyo-kuKyoto 606-8502Japan. Advanced Research Institute for Science&Engineering Waseda University3-4-1 OkuboShinjukuTokyo 169-8555Japan. Department of Applied Information Sciences Graduate School of Information SciencesTohoku University6-3-09 AobaAramaki-azaAoba-kuSendaiMiyagi 980-8579Japan. NICHe Tohoku University6-6-10 AobaAramaki-azaAoba-kuSendaiMiyagi 980-8579Japan. Institute of Fluid Science Tohoku University2-1-1 KatahiraAoba-kuSendaiMiyagi980-8577Japan.

A new approach for reducing error of the volume penalization method is *** mask function is modified by shifting the interface between solid and fluid by√νηtoward the fluid region,whereνandηare the viscosity and the permeability,*** shift length√νηis derived from the analytical solution of the one-dimensional diffusion equation with a penalization *** effect of the error reduction is verified numerically for the one-dimensional diffusion equation,Burgers’equation,and the two-dimensional Navier-Stokes *** results show that the numerical error is reduced except in the vicinity of the interface showing overall second-order accuracy,while it converges to a non-zero constant value as the number of grid points increases for the original mask ***,the new approach is effective when the grid resolution is sufficiently high so that the boundary layer,whose width is proportional to√νη,is ***,the approach should be used when an appropriate combination ofνandηis chosen with a given numerical grid.

关键词： Volume penalization method immersed boundary method compact scheme error reduction.

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Visualization of flashback in a premixed burner with swirling flow

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Science China(Technological Sciences) 2010年第1期53卷 40-45页

作者： Satoshi TANIMURA Masaharu KOMIYAMA Kenichiro TAKEISHI yuji IWASAKI Kiyonobu NAKAYAMA Mitsubishi Heavy Industries Ltd.2-1-1ShinhamaArai-choTakasagoHyogo676-0871Japan Department of Mechanical Engineering Osaka University2-1YamadaokaSuitaOsaka565-0871Japan

In this study,the measurement object is a flame propagating in a premixed burner with swirling flow in order to investigate unsteady flame behavior in a gas turbine *** flashback,the flame propagating upstream was visualized with a high-speed ***,we established the technique to measure the instantaneous flow fields of unburned fuel-air mixture in a swirling premixed burner using particle image velocimetry(PIV).As a result,the characteristics of flame behavior propagating upstream were *** it was found that a low velocity region existed in the vicinity of the flame *** relationship between low velocity region and flame behavior was discussed in detail.

关键词： gas turbine lean premixed combustion flashback particle image velocimetry

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Influence of Housing and Urban Development on Debris Flow Flooding and Deposition

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Journal of Mountain Science 2013年第2期10卷 273-280页

作者： Kana NAKATANI Yuki OKUYAMA yuji HASEGAWA Yoshifumi SATOFUKA Takahisa MIZUYAMA Graduate School of Agriculture Kyoto UniversityKitashirakawa Oiwake-choSakyo-kuKyoto City606-8502Japan National Institute for Land and Infrastructure Management AsahiTsukuba CityIbaraki305-0804Japan Civil Engineering Research Laboratory 904-1 TohigashiTsukuba CityIbaraki300-2633Japan Department of Civil Engineering Ritsumeikan University1-1-1 Noji-higashiKusatsu CityShiga525-8577Japan

Debris flows form deposits when they reach an alluvial fan until they eventually ***,houses located in the alluvial fan might affect the debris flow flooding and deposition *** previous studies have considered the effects of houses on debris flow flooding and *** study conducted model experiments and numerical simulations using the Kanako2D debris flow simulator to determine the influence of houses on debris flow flooding and *** model experiments showed that when houses are present,the debris flow spreads widely in the cross direction immediately upstream of the houses,especially when the flow discharge is large or the grain size is *** located in the alluvial fan also influence the deposition *** presence of houses led to flooding and deposition damage in some places and reduced the damage in *** simulation also demonstrated the influence of *** the model experiment and the simulation showed that houses change the flooding and deposition areas.

关键词： Debris flow Alluvial fan House Modelexperiment Numerical simulation

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Chemically induced local lattice distortions versus structural phase transformations in compositionally complex alloys

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npj Computational Materials 2021年第1期7卷 312-319页

作者： yuji Ikeda Konstantin Gubaev Jörg Neugebauer Blazej Grabowski Fritz Körmann Institute for Materials Science University of StuttgartStuttgartGermany Max-Planck-Institut für Eisenforschung GmbH DüsseldorfGermany Department of Materials Science and Engineering Delft University of TechnologyDelftThe Netherlands

Recent experiments show that the chemical composition of body-centered cubic(bcc)refractory high entropy alloys(HEAs)can be tuned to enable transformation-induced plasticity(TRIP),which significantly improves the ductility of these *** calls for an accurate and efficient method to map the structural stability as a function of composition.A key challenge for atomistic simulations is to separate the structural transformation between the bcc and theωphases from the intrinsic local lattice distortions in such chemically disordered *** solve this issue,we develop a method that utilizes a symmetry analysis to detect differences in the crystal *** this method in combination with ab initio calculations,we demonstrate that local lattice distortions largely affect the phase stability of Ti–Zr–Hf–Ta and Ti–Zr–Nb–Hf–Ta *** relaxation effects are properly taken into account,the predicted compositions near the bcc–hcp energetic equilibrium are close to the experimental compositions,for which good strength and ductility due to the TRIP effect are observed.

关键词： alloys ductility distortion

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