检索结果-南通市图书馆

Journal of Materials Science & Technology 2022年第1期96卷 85-93页

作者： Q.Yan B.Chen L.Cao k.Y.Liu S.Li L.Jia k.kondoh J.S.Li State key Laboratory of Solidification Processing Northwestern Polytechnical UniversityXi’an 710072China School of Materials Science and Engineering Xi’an University of TechnologyXi’an 710048China Joining and Welding Research Institution Osaka University11-1 MihogaokaIbarakiOsaka 567-0047Japan

In order to construct quasi-continuously networked reinforcement in titanium(Ti)matrix composites,in this study,Ti-6 Al-4 V spherical powders were uniformly coated with a graphene nanosheet(GNS)layer by high energy ball milling and then consolidated by spark plasma *** showed that the GNS layer on the powder surface inhibited continuous metallurgy bonding between powders during sintering,which led to the formation of quasi-networked hybrid reinforcement structure consisting of insitu Ti C and remained *** networked GNSs/Ti64 composite possessed noticeably higher tensile strength but similar ductility to the Ti64 alloy,leading to both better tensile strength and ductility than the GNSs/Ti composite with randomly dispersed GNSs and Ti *** formation mechanism and the fracture mechanism of the networked hybrid reinforcement were *** results provided a method to fabricate Ti matrix composites with high strength and good ductility.

关键词： Titanium matrix composites(TMCs) Graphene Network structure Strength Ductility

Microstructure,Phase Transformation,Precipitation Behavior and Mechanical Properties of P/M Cu40Zn-1.0 wt%Ti Brass Alloy via Spark Plasma Sintering and Hot Extrusion

在线全文

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2013年第11期29卷 1018-1024页

作者： Shufeng Li Hisashi Imai katsuyoshi kondoh Faculty of Materials Science and Engineering Xi'an University of Technology Joining and Welding Research Institute Osaka University

The effect of titanium addition on the microstructure and mechanical properties of brass Cu4OZn has been studied via the powder metallurgy （P/M） route. The water-atomized Cu4OZn-1.0 wt% Ti alloy powder was consolidated at different temperatures in the range of 400-600℃ using spark plasma sintering （SPS） and hot extrusion subsequently. Results show that the super-saturated solid solution titanium element in rapidly cooled brass Cu4OZn powder created high chemical potential for a precipitate reaction, showing significant grain refinement effects on the consolidated Cu4OZn matrix. Consequently, excellent mechanical properties were obtained by precipitation hardening and work hardening after sintering and extrusion, with yield strength of 390 MPa, ultimate tensile strength of 617 MPa, and Vickers micro-hardness of 192 HV, which are 28.7%, 23.4%, and 23.9% higher values than those of extruded Cu4OZn brass, respectively.

关键词： Brass Spark plasma sintering Extrusion Microstructure Mechanical property Precipitation Phase transformation

Anomalous Wave Energy Deposition in the Beginning Phases of Wave Injection in JT-60U Lower Hybrid Current Drive Experiments

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 1999年第11期16卷 827-829页

作者： FANG Yu-de kenkichi USHIGUSA Takashi kondoh Institute of Plasma Physics Chinese Academy of SciencesHefei 230031 JT-60U Experiment Division Naka Fusion Research EstablishmentJapan Atomic Energy Research InstituteNaka-MachiNaka-gunIbaraki-kenJapan

An anomalous phenomenon of wave energy deposition and its evolution were noticed in the beginning phases of lower hybrid wave injection in JT-60U experiments. It was found that the driven currents are always formed in the central region of the plasma column in the first several hundred milliseconds of the wave pulses, no matter what N|| spectrum of the waves is. Then the driven current profile will change to their normal situation gradually, which depends on N|| spectrum closely.

关键词： wave spectrum Wave

Trans-synaptic Neural Circuit-Tracing with Neurotropic Viruses

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Neuroscience Bulletin 2019年第5期35卷 909-920页

作者： Jiamin Li Taian Liu Yun Dong kunio kondoh Zhonghua Lu Guangdong Provincial key Laboratory of Brain Connectome and Behavior The Brain Cognition and Brain Disease Institute Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences Shenzhen 518055 China University of Chinese Academy of Sciences Beijing 100049 China Division of Endocrinology and Metabolism Department of Homeostatic Regulation National Institute for Physiological Sciences National Institute of Natural Sciences Myodaiji Okazaki Aichi 444-8585 Japan Japan Science and Technology Agency PRESTO Myodaiji Okazaki Aichi 444-8585 Japan

A central objective in deciphering the nervous system in health and disease is to define the connections of neurons. The propensity of neurotropic viruses to spread among synaptically-linked neurons makes them ideal for mapping neural circuits. So far, several classes of viral neuronal tracers have become available and provide a powerful toolbox for delineating neural networks. In this paper, we review the recent developments of neurotropic viral tracers and highlight their unique properties in revealing patterns of neuronal connections.

关键词： Neurotropic virus Central nervous system Neural circuit Trans-synaptic tracer Retrograde tracing Anterograde tracing

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

在线全文

学校读者我要写书评

暂无评论

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

Efect of CNTs on Activation Volume and Mobile Dislocation Exhaustion Rate of CNTs/Al under Compression Loading

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2023年第1期36卷 127-132页

作者： Minjie Wang Jianghua Shen Biao Chen Umeda Junko katsuyoshi kondoh Yulong Li School of Aeronautics Northwestern Polytechnical UniversityXi’an 710000China Shaanxi key Laboratory of Impact Dynamic and Its Engineering Application Xi’an 710000China School of Materials Science and Engineering Northwestern Polytechnical UniversityXi’an 710000China Joining and Welding Research Institute Osaka University11-1 MihogaokaOsaka 567-0047Japan School of Civil Aviation Northwestern Polytechnical UniversityXi’an 710000China Joint International Research Laboratory of Impact Dynamics and Its Engineering Applications Xi’an 710000China

In this study,stress relaxation compression tests were performed to investigate the strain rate sensitivity,activation volume and mobile dislocations in carbon nanotubes/aluminum(CNTs/Al)*** results reveal that,with the addition of CNTs,the strain rate sensitivity of CNTs/Al ***,a smaller V*of CNTs/Al compared with pure Al was attributed mainly to the CNT-Al interfaces and partly to the increased forest dislocations cutting activities in grain interior,which was related to the tendency of short ranges order formation during plastic *** incorporation of CNTs also improved the dislocation storage capability and reduced the dislocation velocity,leading to a lower mobile dislocation exhaustion rate.

关键词： Metal matrix composites Carbon nanotubes Strain rate sensitivity Activation volume Dislocations exhaustion

Generating soil salinity, soil moisture, soil pH from satellite imagery and its analysis

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Information Processing in Agriculture 2020年第2期7卷 294-306页

作者： Mochamad Firman Ghazali ketut Wikantika Agung Budi Harto Akihiko kondoh Center for Remote Sensing Bandung Institute of Technology(CRS-ITB)BandungIndonesia Remote Sensing and GIS Research Group Faculty of Earth Science and TechnologyBandung Institute of TechnologyBandungIndonesia ForMIND Institute Indonesia Center for Environmental Remote Sensing(CeRES) Chiba UniversityJapan Department of Geodesy and Geomatics Engineering Faculty of EngineeringUniversity of LampungIndonesia

In an agricultural field,the water content and salt content are defined as soil moisture and soil salinity and have to be estimated *** changing of these two factors can be assessed using remote sensing *** study was conducted by analysing the Landsat 8 satellite images,soil data of field surveys,laboratory analyses and statistical *** properties such as soil moisture and soil salinity were estimated using soil moisture index(SMI)and soil salinity index(SSI),*** research combined and integrated the soil data from survey and laboratory with Landsat 8 satellite images to build two multiple regression equations model named the soil pH Index(SpHI).They are based on bare soil and paddy leaf models as the explanatory factors of soil moisture and soil salinity *** the computation processes were replicated three times using three different dates of Landsat 8 satellite images to produce the multi-temporal *** moisture increased after 30 days,while the salt content was only trace *** proposed models detected 4.49–7.59 of soil pH,4.66 in bare soil model and 6.62 in paddy leaf *** the planting period,the soil pH in bare soil model decreased to 2.12–6.47 while the paddy leaf model increased to 4.49–7.59 with RMSE 1.40 and PRMSE 24%of *** spatial relationship between soil pH,soil salinity and soil moisture are linear but varied in correlation level from weak,moderate to *** on the bare soil model,the relationship between soil pH and soil moisture shows a weak negative relationship with R28.37%and a strong positive relationship with R281.94%in paddy area and bare soil area respectively,as like as in paddy area based on the paddy leaf model with R2100%.The relationship between soil temperature and soil pH shows a weak negative relationship for all models and a moderate negative relationship of soil salinity and soil pH in bare soil area based on the bare soil model with R234.89%.

关键词： Landsat 8 Soil moisture index Soil salinity index Soil pH Paddy leaf model Bare soil model

A thermal activation based constitutive model for the dynamic deformation of AA5083 processed by large-scale equal-channel angular pressing

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Aeronautics 2023年第5期36卷 499-507页

作者： Yunfei WANG Minjie WANG Biao CHEN Huijie SUN katsuyoshi kondoh Laszlo JkECSkES Jianghua SHEN School of Aeronautics Northwestern Polytechnical UniversityXi’an 710072China School of Materials Science and Engineering Northwestern Polytechnical UniversityXi’an 710072China Joining and Welding Research Institute Osaka University11-1 MihogaokaOsaka 567-0047Japan Hopkins Extreme Materials Institute Johns Hopkins UniversityBaltimore 21218USA Shaanxi key Laboratory of Impact Dynamic and Its Engineering Application Xi’an 710072China

Aluminum alloy 5083(AA5083)processed by large-scale Equal-channel angular pressing(ECAP)is an excellent engineering material with great prospects for industrial *** accurate assessment of the underlying constitutive relationships with easily determined material constants is critical for the predictive design and informed processing of such structural *** develop such a design framework,uniaxial dynamic compressive tests over a wide range of temperatures(293-573 k)were carried out for an ECAP-processed AA5083 ***,the microstructure before and after dynamic loading was characterized by SEM and *** on the experimental results,a new dynamic constitutive model,based on thermal activation theory,was established to describe the plastic flow behavior of the AA5083 alloy that incorporates the effects of plastic strain,temperature,and strain *** input parameters of the new model were determined using a particle swarm optimization(PSO)*** model predictions show excellent agreement with experimental results,which suggests that the current predictive constitutive model is highly effective in reproducing the dynamic deformation behavior of the large-scale ECAP-processed AA5083.

关键词： Aluminum alloy 5083(AA5083) Constitutive models Dynamic response Equal channel angular pressing(ECAP) Thermal activation

Microstructure evolution and reaction behavior of Cu–Ni alloy and B4C powder system

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2021年第1期31卷 55-62页

作者： Lei Jia Ming-fang Yang Zhen-lin Lu Jin Xu Hui Xie katsuyoshi kondoh School of Materials Science and Engineering Xi'an University of Technology School of Materials Engineering Xi'an Aeronautical University Joining and Welding Research Institute Osaka University

Microstructure evolution and reaction behavior of Cu–Ni alloy and B4C power system was studied by in-situ and static experimental investigations along with theoretical calculations. The reaction process was as follows. Firstly,B4C decomposed into B and C atoms, and then B atoms diffused into Cu–Ni matrix, leading to the formation of Ni2B particles. Subsequently, Ni atoms diffused into B4C, forming a loose mixture of Ni2B and amorphous C at the initial powder boundary. Finally, with the completion of reaction, Ni2B particles at the powder boundary grew into a monolithic block, and then C substance was excluded out and accumulated at the edge of this monolithic Ni2B block. It is believed that the formation of Ni2B phase is caused by the most negative change of Gibbs free energy among all the potential reactions between Ni–B and Ni–B4C systems.

关键词： Metal-matrix composites Reaction behavior Microstructure evolution Cu–Ni/B 4 C composite In-situ experiment

Modeling three-dimensional forest structures to drive canopy radiative transfer simulations of bidirectional reflectance factor

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

International Journal of Digital Earth 2018年第10期11卷 981-1000页

作者： Wei Yang Hideki kobayashi Xuehong Chen kenlo Nishida Nasahara Rikie Suzuki Akihiko kondoh Center for Environmental Remote Sensing Chiba UniversityChibaJapan Department of Environmental Geochemical Cycle Research Japan Agency for Marine-Earth Science and TechnologyYokohamaJapan State key Laboratory of Earth Surface Processes and Resource Ecology Beijing Normal UniversityBeijingPeople’s Republic of China Faculty of Life and Environmental Sciences University of TsukubaTsukubaJapan

Three-dimensional(3-D)Monte Carlo-based radiative transfer(MCRT)models are usually used for benchmarking in intercomparisons of the canopy radiative transfer(RT)***,the 3-D MCRT models are rarely applied to develop remote sensing algorithms to estimate essential climate variables of forests,due mainly to the difficulties in obtaining realistic stand structures for different forest biomes over regional to global ***,some of important tree structure parameters such as canopy height and tree density distribution have been available *** enables to run the intermediate complexities of the 3-D MCRT *** consequently developed a statistical approach to generate forest structures with intermediate complexities depending on the inputs of canopy height and tree *** aims at facilitating applications of the 3-D MCRT models to develop remote sensing retrieval *** proposed approach was evaluated using field measurements of two boreal forest stands at Estonia and USA,*** demonstrated that the simulations of bidirectional reflectance factor(BRF)based on the measured forest structures agreed well with the BRF based on the generated structures from the proposed approach with the root mean square error(RMSE)and relative RMSE(rRMSE)ranging from 0.002 to 0.006 and from 0.7%to 19.8%,*** of the computed BRF with corresponding MODIS reflectance data yielded RMSE and rRMSE lower than 0.03 and 20%,*** the results from the current study are limited in two boreal forest stands,our approach has the potential to generate stand structures for different forest biomes.

关键词： Bidirectional reflectance factor remote sensing forest structure radiative transfer model