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pHSIcAL MODELLING AND pROcESSING OF Ti-6Al-4V ELI

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Acta Metallurgica Sinica(English Letters) 2000年第2期13卷 606-610页

作者： c.p. chou, S.c. Wang, c.c. chang and W.R. Wang 1) Department of Mechanical Engineering, National chiao Tung University Hsinchu, Taiwan 300, china 2) Materials Research Laboratories, Industrial Technology Research Institute chutung, Taiwan 310, china

Titanium has been widely used as the implant materials of joint prostheses. This paper simulates the microstructures of the hot forged titanium knee joint component by physical modeling. Ti-6Al-4V ELI were deformed by GLEEBLE 2000 hot deforma- tion simulator in compression mode to determine the hot workability, in the range of 900 to 1100℃, with the strain rates between 0.05 to 5 s^(-1). Test results derived from specimens processed by on-cooling test and on-heating test were compared, thereby estimating the effect due to thermal history. The forging process of Ti-6Al-4V ELI tibial base plate of knee joint prostheses was design based on the workability data obtained.

关键词： physical modeling hot workability processing map,compression test hot forging

Effect of Laser Welding on properties of Dissimilar Joint of Al-Mg-Si and Al-Mn Aluminum Alloys

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Journal of Materials Science & Technology 2010年第3期26卷 276-282页

作者： c.c.chang c.p.chou S.N.Hsu G.Y.Hsiung J.R.chen Department of Mechanical Engineering National Chiao-Tung University National Synchrotron Radiation Research center Department of Biomedical Engineering and Environmental Sciences National Tsing-Hua University

This study discusses the welding properties for the components of an aluminum-alloy ultra-high vacuum chamber and beam position monitor （BpM）.The welding parameters include the modes of laser output （pulsed wave and continuous wave）,welding speed,shield gas flow,welding bead structure,and focusing *** results showed that the welding defect rate of the pulsed wave type was larger than that of the continuous wave *** crack in the welding bead reduced with decreasing welding *** fusion penetration of the welding bead was higher when the focusing distance was long enough to deepen into the welding *** morphology during the experimental process revealed the proper flow of shield *** adaptability design of the welding bead structure in the preceding processes had more effect on overall welding structure and morphology.

关键词： Laser welding Aluminum alloy Ultra-high vacuum Beam position monitor (BpM)

Regional ozone pollution and key controlling factors of photochemical ozone production in pearl River Delta during summer time

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Science china chemistry 2010年第3期53卷 650-662页

作者： cHANG chihchung chou c.K.charles Andreas Wahner Research center for Environmental changes Academia SinicaTaipei 11529China Forschungszentrum Juelich ICG-Ⅱ:TroposphereJuelichGermany

An intensive field campaign including measurements from the environmental monitoring network and from two super sites took place in the pearl River Delta region in summer *** routinely measured O3 and NOx concentrations,the spatial and temporal variation of O3 and of the total oxidant concentrations was *** to the spatial variability of NO2/NO,the two super sites were found to be representative of polluted urban and downwind suburban *** addition,both sites were located in high O3 ***-depth diagnostic of photochemical ozone production processes and their key controlling factors are achieved with an observation-based model(OBM) to gain regional *** analysis and sensitivity model runs show that aldehyde and HONO chemistry had significant impacts on local photochemical ozone production *** analysis of calculated Relative Incremental Reactivities shows that photochemical ozone production rates are mainly sensitive to anthropogenic hydrocarbons(Hcs) in the polluted urban *** the suburban areas,sensitivity to nitrogen oxide(NO) concentrations *** anthropogenic Hcs in both areas are alkenes and *** differences of ozone production efficiencies are identified between the urban and suburban regions,consistent with the OBM diagnosed results.

关键词： ozone pearl River Delta photochemical ozone productions HONO relative incremental reactivity

projections of the impacts of climate change on the water deficit and on the prec.p.tation erosive indexes in Mantaro River Basin, peru

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Journal of Mountain Science 2018年第2期15卷 264-279页

作者： Sly c.WONGcHUIG carlos R.MELLO Sin c.chou Hydraulics Institute Research Federal University of Rio Grande do Sul Soil and Water Engineering Federal University of Lavras Brazilian Weather Research and Forecast National Spatial Research Institute (INPE)

projections of climate change are essential to guide sustainable development plans in the tropical Andean countries such as peru. This study assessed the projections of prec.p.tation and potential evaporation, rain erosive potential, and prec.p.tation concentration in the Mantaro River Basin, in the peruvian Andes, which is important for agriculture and energy production in peru. We assumed the Intergovernmental panel on climate change （Ipcc） AIB greenhouse gas emission scenario and simulated the global climate change by the HadcM3 global climate model. Due to the steepness of the mountain slopes and the narrowness of the river valley, this study uses the downscaling of the global model simulations by the regional Eta model down to 2o-km resolution. The downscaling projections show decrease in the monthly prec.p.tation with respect to the baseline period, especially during the rainy season, between February and April, until the end of the 21st century. Meanwhile, a progressive increase in the monthly evaporation from the baseline period is projected. The Modified Fournier Index （MFI） shows a statistically significant downward trend in the Mantaro River Basin, whieh suggests a possible reduction in the rain erosive potential. The prec.p.tation concentration Index （pcI） shows a statistically significant increasing trend, which indicates increasingly more irregular temporal distribution of prec.p.tation towards the end of the century. The results of this study allow us to conclude that there should be a gradual increase in water deficit and prec.p.tation concentration. Both changes can be negative for agriculture, power generation, and water supply in the Mantaro River Basin in peru.

关键词： prec.p.tation Evaporation prec.p.tationconcentration Index (pcI) Modified Fournier Index(MFI) climate change Tropical Andes

A possible unification model for all basic forces

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Science china Mathematics 1998年第3期41卷 324-329页

作者：吴岳良 K.c.chou 周光召 Institute of Theoretical physics Chinese Academy of Sciences Beijing China chinese Academy of Sciences Beijing China

A unification model for strong, electromagnetic, weak and gravitational forces is proposed. The tangent space of ordinary coordinate 4-dimensional spacetime is a submanifold of a 14-dimensional internal spacetime spanned by four frame fields. The unification of the standard model with gravity is governed by gauge symmetry in the internal spacetime.

关键词： unification internal spacetime SO(1 13) gravity frame fields.

A novel scrape-applied method for the manufacture of the membrane-electrode assembly of the fuel-cell system

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Acta Mechanica Sinica 2009年第6期25卷 831-837页

作者： S. D. Wu c. p. chou R. G. peng c. H. Lee Y. Z. Wang Department of Mechanical Engineering National Chiao Tung University EE412 1001 Ta Hsueh RoadHsinchu 30010 Taiwan China Department of chemical Engineering National YunlinUniversity of Science and Technology Yunlin China

This study investigates the transfer of the scrape-applied method from the electrodes of a lithium battery to the membrane-electrode assembly of fuel cells, including proton Exchange Membrane Fuel cells and Direct Methanol Fuel cell. Three methods are commonly used to manufacture lithium battery electrodes： the roller-applied method, the spraying-applied method, and the scrape-applied method. This study develops novel scrape-applied equip- ment for lithium battery electrodes. This method is novel and suitable for producing fuel cell, better than other tradi- tional methods. In this study, the stability of coating process was tested by measuring the weight and thickness of a dry electrode. The stability and reproducibility of electrode fab- rication were examined by systematic data analysis. Finally, the study used a specially designed single cell composed of 16 conductive segments, which are insulated locally. The current passing through each segment was measured using Hall Effect sensors connected to the segment compartments. Based on the measured distribution of the local current in a segmented single cell, the influence of flooding and stoi- chiometry variation of feed gas was discussed in terms of electrochemical reaction rate. The experimental results serve as an important basis for future research in this field, which hold potential benefits to the academia and the industry.

关键词： Fuel cells . Scraper . Electrode. Lithium battery - Reliability

Extended Gate Field Effect Transistor Based Measuring of the Vitamin c content of Orange Juice

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稀有金属材料与工程 2006年第A3期35卷 342-343页

作者： Jung-chuan chou Department of Electronic Engineering National Yunlin University of Science and TechnologyDouliouTaiwan 640China

An extended-gate field effect transistor (EGFET)of SnO_2/ITO glass was applied to manufacture the vitamin c ***,we immobilized the ascorbate oxidase with 3-glycidoxypropyltrimethoxysilane (GpTS)method to measure the different concentrations of the vitamin c solution in an optimum measurement *** order to find the best measurement conditions of the biosensor,we studied the vitamin c sensor in different pH values of the phosphate buffer solution (pBS).Additionally,we used experimental results to discuss the response time and response voltage to compare vitamin c with orange juice for the vitamin c sensor.

关键词： orange juice extended-gate field effect transistor SnO2/ITO glass vitamin c sensor

preparation and oxidation characteristics of Zrc-ZrB2 composite powders with different proportions

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International Journal of Minerals,Metallurgy and Materials 2022年第3期29卷 521-528页

作者： Yu Wang Guohua Zhang Kuochih chou State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China

Zrc and ZrB2 are both typical ultra-high temperature ceramics,which can be used in the hyperthermal *** this study,a method for preparing ultrafine Zrc-ZrB2 composite powder was provided,by using the raw materials of nano ZrO2,carbon black,B4c,and metallic *** is worth pointing out that Zrc-ZrB2 composite powder with any proportion of Zrc to ZrB2 could be synthesized by this ***,a mixture of Zrc and c was prepared by carbothermal reduction of *** adjusting the addition amount of B4c,Zrc was boronized by B4c to generate Zrc-ZrB2 composite powder with different *** this method,five composite powders with different molar ratios of Zrc and ZrB2(100Zrc,75Zrc-25ZrB2,50Zrc-50ZrB2,25Zrc-75ZrB2,and 100ZrB2)were *** the temperature of boronization and decarburization process was 1473 K,the particle size of product was only tens of ***,the oxidation charac-teristics of different composite powders were investigated through oxidation *** oxidation resistance of Zrc-ZrB2 composite powder continued to increase as the content of ZrB2 increased.

关键词： borides carbides core-shell structures powders ultra-high temperature ceramic

Novel Biomass-derived Hollow carbons as Anode Materials for Lithium-ion Batteries

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chemical Research in chinese Universities 2023年第2期39卷 283-289页

作者： WU Ziye LI Zifan chou Shulei LIANG Xiaoyu School of Measurement and Testing China Jiliang UniversityHangzhou310018China college of chemistry and Materials Engineering Wenzhou UniversityWenzhou325035China

A novel hollow carbon derived from biomass lotus-root has been prepared by a one-step carbonization *** carbon anode obtained at 900℃ showed the best electrochemical performance,corresponding to a high specific c.p.city of 445 mA·h/g at 0.1 c,as well as excellent cycling stability after 500 *** investigation exhibits that the lithium storage of hollow carbon involves Li^(+) adsorption in the defect sites and Li^(+) *** results showed that the intrinsic structure of lotus root can inspire us to prepare biomass carbon with a hollow structure as an excellent anode for lithium-ion batteries.

关键词： Biomass hollow carbon Lithium-ion battery Negative electrode material Electrochemical performance