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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

A Vertex Network Model of Arabidopsis Leaf Growth

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communications on Applied Mathematics and computation 2024年第1期6卷 454-488页

作者： Luke Andrejek Janet Best ching-Shan chou Aman Husbands Department of Mathematics The Ohio State UniversityColumbusOHUSA Department of Biology The University of PennsylvaniaPhiladelphiaPAUSA

Biology provides many examples of complex systems whose properties allow organisms to develop in a highly reproducible,or robust,*** such system is the growth and development of flat leaves in Arabidopsis *** mechanistically challenging process results from multiple inputs including gene interactions,cellular geometry,growth rates,and coordinated cell *** better understand how this complex genetic and cellular information controls leaf growth,we developed a mathematical model of flat leaf *** two-dimensional model describes the gene interactions in a vertex network of cells which grow and divide according to physical forces and genetic ***,the model predicts the presence of an unknown additional factor required for the formation of biologically realistic gene expression domains and iterative cell *** two-dimensional model will form the basis for future studies into robustness of adaxial-abaxial patterning.

关键词： Robustness Adaxial-abaxial patterning Mathematical modeling Gene regulatory networks(GRNs) Transcription factors Small RNAs

catalytic behavior of Mo-Bi-Fe-co-K-M-O(M=ce,Gd,ceGd)catalysts for selective oxidation of isobutene

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Journal of Rare Earths 2024年第1期42卷 84-93,I0003页

作者： Qinghui Li Huahua Zhao Jian Yang Jun Zhao Liang Yan Huanling Song Lingjun chou State Key Laboratory for Oxo Synthesis and Selective Oxidation Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhou730000China University of chinese Academy of Sciences Beijing100049China

The further improvement of methacrolein(MAL)selectivity from isobutene(IB)oxidation is crucial and *** this study,based on the typical Mo-Bi-Fe-co-K-O mixed metal oxide,the rare earth element Gd-doped,ce-doped and ceGd co-doped catalysts were prepared by co-prec.p.tation strategy to increase the selectivity of MAL from 47.9%to 49.8%,64.2% and 68.6%,*** order to elucidate in-depth the promoting effect of ce and/or Gd,various characterizations were utilized including X-ray diffraction patterns(XRD),Raman,X-ray fluorescence spectrometry(XRF),X-ray photoelectron spectrosc.p.(XpS),O_(2)-temperature programmed desorption(O_(2)-TpD),H2-temperature programmed reduction(H2-TpR),cO_(2)-temperature programmed desorption(cO_(2)-TpD),IB-temperature programmed desorption(i-c4-TpD)and in-situ IB-Fourier transform infrared spectrosc.p.(IB-FTIR).Both ce and Gd finely regulate the bulk and surface structure of the catalyst,thus altering the redox ability,oxygen mobility and storage ability and *** with ce,Gd addition slightly regulates the variation of co^(2+)/co^(3+)redox couples,greatly enhances the interaction among the components on the catalyst,thus only increases the content of surface oxygen species and has little effect on their *** cecontaining catalyst performs stronger oxygen storage and migration ability,thus leading to the overproduction of surface Odefectspecies,which are proposed to be the active sites for the production of MAL and *** ceGd co-doped catalyst possesses the proper content of surface Odefectspecies,thus exhibits much higher MAL ***,the promoting mechanism of ce and/or Gd over IB oxidation is ***,this work is helpful for understanding the influence of rare earth elements on the structure of mixed metal oxides and the olefin selective oxidation reaction.

关键词： Mixed metal oxide catalyst Rare earth element Isobutene Selective oxidation Methacrolein

Ap4 induces JNK1 and a miR-22-3p/FOSL1 feed-forward loop to activate Ap-1 and promote colorectal cancer metastasis

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cancer communications 2024年第3期44卷 433-437页

作者： Jinjiang chou Markus Kaller Matjaz Rokavec Fangteng Liu Heiko Hermeking Experimental and Molecular pathology Institute of PathologyMedical FacultyLudwig-Maximilians-Universität MünchenMunichGermany German cancer consortium(DKTK) Partner siteMunichGermany German cancer Research center(DKFZ) HeidelbergGermany

Dear Editor,colorectal cancer(cRc)is the third most deadly can-cer worldwide[1].The mortality of cRc has remained high due to limited treatment options for metastatic cRc(mcRc)[2].Epithelial-mesenchymal transition(EMT)is an important contributor to mcRc[2].The c-MYc.p.oto-oncogene(MYc)-induced transcription factor Ap4(TFAp4/Ap4)isadriverofEMT,therebypresumablyfacil-itates mcRc[3,4].The mitogen-activated protein kinase(MApK)/c-JunN-terminalkinase(JNK)/activatorprotein-1(Ap-1)pathway has been implicated in the regulation of EMT and mcRc[5].

关键词： JNK1 metastasis EMT

pVDF/6H-Sic composite fiber films with enhanced piezoelectric.p.rformance by interfacial engineering for diversified applications

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Journal of Materials Science & Technology 2024年第3期170卷 238-245页

作者： Linlin Zhou Tao Yang chunyu Guo Kang Wang Enhui Wang Laipan Zhu Hailong Wang Sheng cao Kuo-chih chou Xinmei Hou Institute for carbon Neutrality University of Science and Technology BeijingBeijing 100083China Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of SciencesBeijing 101400China School of Materials Science Engineering Zhengzhou UniversityZhengzhou 450001China State Key Laboratory of Featured Metal Materials and Life-cycle Safety for composite Structures Guangxi UniversityNanning 530004China

piezoelectric silicon carbide(Sic)has been quite attractive due to its superior chemical and physical properties as well as wide potential ***,the inherent brittleness and unsatisfactory piezoelectric response of piezoelectric semiconductors remain the major obstacles to their diversified ***,flexible multifunctional pVDF/6H-Sic composite fiber films are fabricated and utilized to assemble both piezoelectric nanogenerators(pENGs)and stress/temperature/light *** open cir-cuit voltage(V_(oc))and the density of short circuit current(I_(sc))of the pENG based on the pVDF/5 wt%6H-Sic composite fiber films reach 28.94 V and 0.24μA cm^(-2),showing a significant improvement of 240%and 300%compared with that based on the pure pVDF *** effect of 6H-Sic nanoparticles(Nps)on inducing interfacial polarization and stress concentration in composite fiber films is proved by first-princ.p.es calculation and finite element *** stress/temperature/light sensors based on the composite fiber film also show high sensitivity to the corresponding *** study shows that the pVDF/6H-Sic composite fiber film is a promising candidate for assembling high-performance energy harvesters and diverse sensors.

关键词： 6H-Sic pVDF Multifunctional composite fiber film Energy harvester Stress/temperature/light sensor

Mobile-ionic FETs with ultra-scaled amorphous dielectric achieving ferroelectric behaviors and sub-kT/q swing with temperature down to 77 K

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Science china(Information Sciences) 2024年第1期67卷 312-313页

作者： Huan LIU Qiyu YANG chengji JIN Jiajia cHEN Lulu chou Xiao YU Yan LIU Genquan HAN Research center for Intelligent chips School of Microelectronics Xidian University

The steep subthreshold swing (SS) could be achieved in negative c.p.citance field-effect transistors (NcFET) to reduce power dissipation in modern electronics. polycrystalline Hf O2-based ferroelectric materials have attracted great interest due to their better thickness scalability and cMOS process compatibility [1].

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Efficient piezo-catalytic dye degradation using piezoelectric 6H-Sic under harsh conditions

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Rare Metals 2024年第7期43卷 3173-3184页

作者： Lin-Lin Zhou Tao Yang Kang Wang Lai-pan Zhu En-Hui Wang Kuo-chih chou Hai-Long Wang Xin-Mei Hou Institute for carbon Neutrality University of Science and Technology BeijingBeijing 100083China Institute of Steel Sustainable Technology Liaoning Academy of MaterialsShenyang 110000China Beijing Institute of Nanoenergy and Nanosystems Chinese Academy of SciencesBeijing 101400China School of Materials Science Engineering Zhengzhou UniversityZhengzhou 450001China Beijing Advanced Innovation center for Materials Genome Engineering Beijing University of Science and TechnologyBeijing 100083China

The development of novel piezoelectric catalysts against harsh conditions is indeed crucial for improving the piezo-catalytic degradation efficiency of colored organic dyes in *** this work,6H-Sic nanoparticles(Nps)are utilized to piezo-catalytic degrade rhodamine B(RhB)and methylene blue(MB)under ultrasonic vibration for the first *** degradation efficiency of RhB and MB reaches 98.8%and 98.7%within 80 *** piezoelectricity of 6H-Sic is comprehensively analyzed by the piezoresponse force microsc.p.(pFM)and finite element method(FEM).The strong oxidizing active free radicals generated by the continuous piezoelectric.p.larized electric field of 6H-Sic,i.e.,·O_(2)^(-)and·OH,induce the decomposition reactions of colored organic dyes in *** the dyes are proven to degrade to harmless or less-harmful products gradually during the piezo-catalysis process by high-performance liquid chromatography tandem mass spectrometry(HpLc-MS).Moreover,RhB is also decomposed efficiently by 6HSic Nps under acidic and alkaline *** results prove the feasibility of 6H-Sic for decomposing common water pollutants under harsh conditions and provide a new perspective for water purification.

关键词： piezo-catalytic degradation 6H-Sic Rhodamine B(RhB) Methylene blue(MB) Harsh conditions

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