This study introduces an innovative theoretical model critical for predicting stress and strain distributions in Ti/Al bi-metal sheet production and its subsequent deep drawing process.Grounded in extensive mechanical...This study introduces an innovative theoretical model critical for predicting stress and strain distributions in Ti/Al bi-metal sheet production and its subsequent deep drawing process.Grounded in extensive mechanical and geometric analysis,the model facilitates manufacturing process optimization and the production of high-quality components.Finite Element Method(FEM)simulations are integrated to examine the significant effects of die geometric parameters on metal flow dynamics and susceptibility to material stress.The model's precision is enhanced by incorporating anisotropic material properties and cohesive zone models.A rigorous experimental framework validates the model,highlighting the practical utility of optimized parameters in Ti/Al bimetal component fabrication.Additionally,uniaxial tensile tests using the Video Image Correlation-3D(VIC-3D)system provide detailed insights into material deformation,elucidating stress distribution and metal flow in composite layers.Thus,the research presents a refined methodology for the efficient production of Ti/Al bi-metal components,offering valuable knowledge transferable to various materials and processing scenarios.The findings of this work are expected to make a significant impact on material engineering and mechanical manufacturing.展开更多
A well-known fact about mandarin fish(Siniperca chuatsi)is that females grow faster than males.Mandarin fish that have all-female populations have economic advantages,but traditional neo-male fish are difficult to pro...A well-known fact about mandarin fish(Siniperca chuatsi)is that females grow faster than males.Mandarin fish that have all-female populations have economic advantages,but traditional neo-male fish are difficult to produce.In this study,indirect feeding of 500 mg/kg 17α-methyltestosterone(MT)to XX mandarin fish(60 dpf,days post fertilization)with completely differentiated ovaries induced secondary sex reversal.At 40 days after MT treatment,14.7%of mandarin fish with complete reversal was produced,which showed for the first time that XX mandarin fishes with differentiated ovaries still have potentially bisexual germ cells and the plasticity of sex reversal.In the MT treatment group,there was no significant difference in survival compared to the control group.The body weight of the MT treatment group was significantly lower than that of the control group 40 days after treatment(dat)(P<0.05).During MT treatment,serum 11-KT and T concentrations increased and serum E2 concentration decreased in the MT treatment group,but there was no significant difference in hormone levels between the MT treatment group and the control group.A masculinization of mandarin fish was also confirmed by the expression patterns of sex-specific genes sox9,dmrt1,cyp19a1a and foxl2.A significant amount of sox9 and dmrt1 was expressed in the fish gonads of the MT treatment group,whereas cyp19a1a and foxl2 were minimally expressed in the fish gonads.展开更多
Controlled growth of patterned single-walled carbon nanotubes (SWNTs) is an important issue in many applications. Herein, we demonstrated a method to pattern catalyst via inkjet printing for the growth of SWNTs, using...Controlled growth of patterned single-walled carbon nanotubes (SWNTs) is an important issue in many applications. Herein, we demonstrated a method to pattern catalyst via inkjet printing for the growth of SWNTs, using metal salt solutions as the inks and an ordinary office-use printer. We printed water solutions of cobalt acetate on hydrophilic Si substrates and grew high quality SWNT films. The composition of the precursor solutions and the hydrophilicity of the substrates were crucial factors to the patterning.展开更多
基金supported by the National Natural Science Foundation of China(No.52005432,51674222)the Natural Science Foundation of Hebei Province of Iron and Steel Research(No.E2021203179)+1 种基金the Chinese Post-doctoral Science Foundation(No.2020M680904)the Foundation of Hebei Province Post-Doctoral Preferred Project(No.B2020003011)。
文摘This study introduces an innovative theoretical model critical for predicting stress and strain distributions in Ti/Al bi-metal sheet production and its subsequent deep drawing process.Grounded in extensive mechanical and geometric analysis,the model facilitates manufacturing process optimization and the production of high-quality components.Finite Element Method(FEM)simulations are integrated to examine the significant effects of die geometric parameters on metal flow dynamics and susceptibility to material stress.The model's precision is enhanced by incorporating anisotropic material properties and cohesive zone models.A rigorous experimental framework validates the model,highlighting the practical utility of optimized parameters in Ti/Al bimetal component fabrication.Additionally,uniaxial tensile tests using the Video Image Correlation-3D(VIC-3D)system provide detailed insights into material deformation,elucidating stress distribution and metal flow in composite layers.Thus,the research presents a refined methodology for the efficient production of Ti/Al bi-metal components,offering valuable knowledge transferable to various materials and processing scenarios.The findings of this work are expected to make a significant impact on material engineering and mechanical manufacturing.
基金supported by Guangdong Basic and Applied Basic Research Foundation(2019B1515120072)Science and Technology Planning Project of Guangzhou(201904020043)+1 种基金Seed Industry Development Project of Agricultural and Rural Department of Guangdong Province(2022)Innovation Group Project of Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai)(311021006).
文摘A well-known fact about mandarin fish(Siniperca chuatsi)is that females grow faster than males.Mandarin fish that have all-female populations have economic advantages,but traditional neo-male fish are difficult to produce.In this study,indirect feeding of 500 mg/kg 17α-methyltestosterone(MT)to XX mandarin fish(60 dpf,days post fertilization)with completely differentiated ovaries induced secondary sex reversal.At 40 days after MT treatment,14.7%of mandarin fish with complete reversal was produced,which showed for the first time that XX mandarin fishes with differentiated ovaries still have potentially bisexual germ cells and the plasticity of sex reversal.In the MT treatment group,there was no significant difference in survival compared to the control group.The body weight of the MT treatment group was significantly lower than that of the control group 40 days after treatment(dat)(P<0.05).During MT treatment,serum 11-KT and T concentrations increased and serum E2 concentration decreased in the MT treatment group,but there was no significant difference in hormone levels between the MT treatment group and the control group.A masculinization of mandarin fish was also confirmed by the expression patterns of sex-specific genes sox9,dmrt1,cyp19a1a and foxl2.A significant amount of sox9 and dmrt1 was expressed in the fish gonads of the MT treatment group,whereas cyp19a1a and foxl2 were minimally expressed in the fish gonads.
基金financially supported by Ministry of Science and Technology of the People's Republic of China(No. 2016YFA0201904)the National Natural Science Foundation of China (Nos. 21631002, U1632119 and 91333105)
文摘Controlled growth of patterned single-walled carbon nanotubes (SWNTs) is an important issue in many applications. Herein, we demonstrated a method to pattern catalyst via inkjet printing for the growth of SWNTs, using metal salt solutions as the inks and an ordinary office-use printer. We printed water solutions of cobalt acetate on hydrophilic Si substrates and grew high quality SWNT films. The composition of the precursor solutions and the hydrophilicity of the substrates were crucial factors to the patterning.
