Under the impetus of the“Dual Credit”policy,traditional fuel vehicle manufacturers are confronted with significant pressure to meet new energy vehicle credit requirements.To address this challenge,these manufacturer...Under the impetus of the“Dual Credit”policy,traditional fuel vehicle manufacturers are confronted with significant pressure to meet new energy vehicle credit requirements.To address this challenge,these manufacturers are increasingly adopting the Original Design Manufacturer(ODM)strategy to collaborate with new energy vehicle enterprises,thereby acquiring credits and expanding their market presence.However,this strategic approach not only intensifies competition between new energy and traditional fuel vehicle markets but also reshapes the profit distribution between the two types of firms.Drawing upon the framework of the Dual Credit policy,this study establishes a Cournot game model to examine the strategic interactions between traditional fuel vehicle manufacturers and new energy vehicle producers.It further investigates the optimal production decisions under the ODM strategy and evaluates their implications for market dynamics and corporate profitability.The findings reveal that,although the ODM strategy heightens market competition,it leads to substantial profit improvements for both types of manufacturers compared to the alternative of directly purchasing credits,while also fostering the growth of the new energy vehicle sector.Moreover,the Case study demonstrates micro-level impact of the dual credit policy on enterprises’response strategies,offering valuable insights for policymakers and industry decision-makers.展开更多
Ti/Al/Mg laminated composites were successfully fabricated by hot roll bonding.The effects of the rolling reduction on the microstructural evolution and mechanical properties of the composites were explored.The result...Ti/Al/Mg laminated composites were successfully fabricated by hot roll bonding.The effects of the rolling reduction on the microstructural evolution and mechanical properties of the composites were explored.The results show that Ti/Al/Mg laminated sheets exhibit good interfacial bonding.The rolling reduction has a significant effect on the deformation inhomogeneity through the thickness of the Al layer.The initial grains of the Al layer near the Ti/Al interface are fragmented into fine equiaxed grains,and the grains at the center and near the Al/Mg interface are elongated.The R-cube shear texture of the Al layer forms near the Ti/Al interface and permeates into the center layer in the samples with greater rolling reductions.The b-fiber rolling texture of the Al layer is observed near the Al/Mg interface and increases with the increase of rolling reduction.The stress–strain curves indicate that the fracture appears first in the Mg layer.With the increasing rolling reduction,the ultimate tensile and yield strength values increase,and the elongation up to the Mg layer fracture decreases.展开更多
The lamellar structure has an important impact on the mechanical properties of dissimilar laminated metal composites(LMCs),including the thickness ratio of dissimilar metal constituent layers and the number of layers....The lamellar structure has an important impact on the mechanical properties of dissimilar laminated metal composites(LMCs),including the thickness ratio of dissimilar metal constituent layers and the number of layers.AA1100 and AA7075 with thickness ratios of 1:4 and 3:4 were fabricated for multilayer AA1100/AA7075 LMCs by hot accumulative roll bonding(ARB)technology.The bending fracture characteristics of AA1100/AA7075 LMCs with different thickness ratios and numbers of constituent layers were investigated.The research results indicated that AA1100/AA7075 LMCs with a low thickness ratio exhibited better bending ductility and toughness than those with a high thickness ratio,which was attributed to the crack growth resistance caused by the thickness of the soft AA1100 layer.The toughening mechanism introduced by crack deflection or arresting contributed to the enhancement in the toughness of the LMCs compared with that of the single 7075 Al layer.The bonding interfaces of AA1100/AA7075 LMCs with different numbers of layers are continuous and straight due to the high ARB temperature.A decrease in bending toughness was observed as the number of layers increased.Unlike LMCs with a low number of layers,crack deflection or interface delamination is also considered a main toughening mechanism in dissimilar LMCs in addition to the thickness effect.展开更多
Surgery or interventional therapy has some risks in the treatment of cerebral aneurysm. We established an internal carotid artery aneurysm model by dripping elastase in the crotch of the right internal and external ca...Surgery or interventional therapy has some risks in the treatment of cerebral aneurysm. We established an internal carotid artery aneurysm model by dripping elastase in the crotch of the right internal and external carotid arteries of New Zealand rabbits. Following model induction, lentivirus carrying basic fibroblast growth factor was injected through the ear vein. We found that the longer the action time of the lentivirus, the smaller the aneurysm volume. Moreover, platelet-derived growth factor expression in the aneurysm increased, but smooth muscle 22 alpha and hypertension-related gene 1 mRNA expression decreased. At 1,2, 3, and 4 weeks following model establishment, following 1 week of injection of lentivirus carrying basic fibroblast growth factor, the later the intervention time, the more severe the blood vessel damage, and the bigger the aneurysm volume, the lower the smooth muscle 22 aJpha and hypertension-related gene ~ mRNA expression. Simultaneously, platelet-derived growth factor expression decreased. These data suggest that recombinant lentivirus carrying basic fibroblast growth factor can repair damaged cells in the aneurysmal wall and inhibit aneurysm dynamic growth, and that the effect is dependent on therapeutic duration.展开更多
NiTi alloy has been widely used as orthopedic implant materials due to its unique shape memory properties and superelasticity.However,implantation failure often occurs because of the poor antibacterial ability,antioxi...NiTi alloy has been widely used as orthopedic implant materials due to its unique shape memory properties and superelasticity.However,implantation failure often occurs because of the poor antibacterial ability,antioxidation property and corrosion resistance of the NiTi alloy.In order to overcome the above problems,we constructed Zn/polydopamine(PDA)/Chitosan-Catechol(CS-C)composite coating on the surface of NiTi alloy in this paper.The surface morphology and wettability of the coating were characterized by scanning electron microscopy(SEM)and optical contact angle measuring instrument,respectively.The results showed that the Zn/CS-C coating was successfully prepared,and exhibited good hydrophilic property,especially the sample Zn/PDA/CS-C-24 h.In addition,the corrosion resistance,antioxidation property and biological properties of the coating were systematically analyzed.The results indicated that the Zn/PDA/CS-C composite coating exhibited good corrosion resistance and antibacterial property,antioxidant property and osteogenic activity,especially sample Zn/PDA/CS-C-24 h.The sample Zn/PDA/CS-C-24 h could effectively protect osteoblasts from reactive oxygen species(ROS)damage and promote cell proliferation and osteoblast differentiation.This study provides a feasible and effective strategy for the surface modification of orthopedic implant.展开更多
Titanium(Ti)/steel clad plates,combining corrosion resistance of titanium with high strength of steel,are critical for applications in petroleum,aerospace,and pressure vessels.This paper comprehensively reviews four m...Titanium(Ti)/steel clad plates,combining corrosion resistance of titanium with high strength of steel,are critical for applications in petroleum,aerospace,and pressure vessels.This paper comprehensively reviews four manufacturing methods:explosive bonding,roll bonding,explosive-roll bonding,and diffusion bonding detailing their advantages,limitations,and mechanisms.Explosive bonding forms a wavy interface with high strength but faces challenges in process control.Roll bonding ensures dimensional precision but suffers from weakened interfaces due to brittle intermetallic compounds(IMCs).Explosive-roll bonding balances efficiency and quality,yet risks IMCs regrowth during reheating.Diffusion bonding minimizes deformation but requires prolonged processing.Analysis of elemental diffusion and compound formation reveals that coexisting TiC and Fe‒Ti IMCs degrade interfacial strength,while interlayers effectively suppress brittle phases.Experimental results highlight that rolling temperatures and interlayer selection critically influence shear strength and tensile properties.The corrugated-flat rolling(CFR)technique enhances mechanical interlocking and diffusion,achieving superior interface bonding strength.Future research should prioritize optimizing process parameters to control IMCs,developing eco-friendly methods,and revealing dynamic interface evolution to research highperformance and large-scale titanium/steel clad plates.展开更多
文摘Under the impetus of the“Dual Credit”policy,traditional fuel vehicle manufacturers are confronted with significant pressure to meet new energy vehicle credit requirements.To address this challenge,these manufacturers are increasingly adopting the Original Design Manufacturer(ODM)strategy to collaborate with new energy vehicle enterprises,thereby acquiring credits and expanding their market presence.However,this strategic approach not only intensifies competition between new energy and traditional fuel vehicle markets but also reshapes the profit distribution between the two types of firms.Drawing upon the framework of the Dual Credit policy,this study establishes a Cournot game model to examine the strategic interactions between traditional fuel vehicle manufacturers and new energy vehicle producers.It further investigates the optimal production decisions under the ODM strategy and evaluates their implications for market dynamics and corporate profitability.The findings reveal that,although the ODM strategy heightens market competition,it leads to substantial profit improvements for both types of manufacturers compared to the alternative of directly purchasing credits,while also fostering the growth of the new energy vehicle sector.Moreover,the Case study demonstrates micro-level impact of the dual credit policy on enterprises’response strategies,offering valuable insights for policymakers and industry decision-makers.
基金financial supports from the National Natural Science Foundation of China(No.51421001)the National High Technology Research and Development Program of China(863 Program,No.2013AA031304)+1 种基金the Fundamental Research Funds for the CentralUniversitiesofChina(2019CDQYCL001,2019CDCGCL204,2020CDJDPT001)the Research Project of State Key Laboratory of Vehicle NVH and Safety Technology of China(No.NVHSKL-201706)。
文摘Ti/Al/Mg laminated composites were successfully fabricated by hot roll bonding.The effects of the rolling reduction on the microstructural evolution and mechanical properties of the composites were explored.The results show that Ti/Al/Mg laminated sheets exhibit good interfacial bonding.The rolling reduction has a significant effect on the deformation inhomogeneity through the thickness of the Al layer.The initial grains of the Al layer near the Ti/Al interface are fragmented into fine equiaxed grains,and the grains at the center and near the Al/Mg interface are elongated.The R-cube shear texture of the Al layer forms near the Ti/Al interface and permeates into the center layer in the samples with greater rolling reductions.The b-fiber rolling texture of the Al layer is observed near the Al/Mg interface and increases with the increase of rolling reduction.The stress–strain curves indicate that the fracture appears first in the Mg layer.With the increasing rolling reduction,the ultimate tensile and yield strength values increase,and the elongation up to the Mg layer fracture decreases.
基金financially supported by the National Natural Science Foundation of China(No.51421001)the Fundamental Research Funds for the Central Universities(Nos.2019CDQYCL001,2019CDCGCL204 and 2020CDJDPT001)the Research Project of State Key Laboratory of Vehicle NVH and Safety Technology(No.NVHSKL-201706)
文摘The lamellar structure has an important impact on the mechanical properties of dissimilar laminated metal composites(LMCs),including the thickness ratio of dissimilar metal constituent layers and the number of layers.AA1100 and AA7075 with thickness ratios of 1:4 and 3:4 were fabricated for multilayer AA1100/AA7075 LMCs by hot accumulative roll bonding(ARB)technology.The bending fracture characteristics of AA1100/AA7075 LMCs with different thickness ratios and numbers of constituent layers were investigated.The research results indicated that AA1100/AA7075 LMCs with a low thickness ratio exhibited better bending ductility and toughness than those with a high thickness ratio,which was attributed to the crack growth resistance caused by the thickness of the soft AA1100 layer.The toughening mechanism introduced by crack deflection or arresting contributed to the enhancement in the toughness of the LMCs compared with that of the single 7075 Al layer.The bonding interfaces of AA1100/AA7075 LMCs with different numbers of layers are continuous and straight due to the high ARB temperature.A decrease in bending toughness was observed as the number of layers increased.Unlike LMCs with a low number of layers,crack deflection or interface delamination is also considered a main toughening mechanism in dissimilar LMCs in addition to the thickness effect.
基金funded by the Key Medical SubjectProject of Jiangsu Province, No. XK2007227
文摘Surgery or interventional therapy has some risks in the treatment of cerebral aneurysm. We established an internal carotid artery aneurysm model by dripping elastase in the crotch of the right internal and external carotid arteries of New Zealand rabbits. Following model induction, lentivirus carrying basic fibroblast growth factor was injected through the ear vein. We found that the longer the action time of the lentivirus, the smaller the aneurysm volume. Moreover, platelet-derived growth factor expression in the aneurysm increased, but smooth muscle 22 alpha and hypertension-related gene 1 mRNA expression decreased. At 1,2, 3, and 4 weeks following model establishment, following 1 week of injection of lentivirus carrying basic fibroblast growth factor, the later the intervention time, the more severe the blood vessel damage, and the bigger the aneurysm volume, the lower the smooth muscle 22 aJpha and hypertension-related gene ~ mRNA expression. Simultaneously, platelet-derived growth factor expression decreased. These data suggest that recombinant lentivirus carrying basic fibroblast growth factor can repair damaged cells in the aneurysmal wall and inhibit aneurysm dynamic growth, and that the effect is dependent on therapeutic duration.
基金jointly supported by the Natural Science Foundation of Shanxi Province(Nos.202203021222127,202403021212109).
文摘NiTi alloy has been widely used as orthopedic implant materials due to its unique shape memory properties and superelasticity.However,implantation failure often occurs because of the poor antibacterial ability,antioxidation property and corrosion resistance of the NiTi alloy.In order to overcome the above problems,we constructed Zn/polydopamine(PDA)/Chitosan-Catechol(CS-C)composite coating on the surface of NiTi alloy in this paper.The surface morphology and wettability of the coating were characterized by scanning electron microscopy(SEM)and optical contact angle measuring instrument,respectively.The results showed that the Zn/CS-C coating was successfully prepared,and exhibited good hydrophilic property,especially the sample Zn/PDA/CS-C-24 h.In addition,the corrosion resistance,antioxidation property and biological properties of the coating were systematically analyzed.The results indicated that the Zn/PDA/CS-C composite coating exhibited good corrosion resistance and antibacterial property,antioxidant property and osteogenic activity,especially sample Zn/PDA/CS-C-24 h.The sample Zn/PDA/CS-C-24 h could effectively protect osteoblasts from reactive oxygen species(ROS)damage and promote cell proliferation and osteoblast differentiation.This study provides a feasible and effective strategy for the surface modification of orthopedic implant.
基金financial supports from the Foundation Strengthening Project(2022-JCJQ-ZD-177-11)the National Natural Science Foundation of China(No.51421001).
文摘Titanium(Ti)/steel clad plates,combining corrosion resistance of titanium with high strength of steel,are critical for applications in petroleum,aerospace,and pressure vessels.This paper comprehensively reviews four manufacturing methods:explosive bonding,roll bonding,explosive-roll bonding,and diffusion bonding detailing their advantages,limitations,and mechanisms.Explosive bonding forms a wavy interface with high strength but faces challenges in process control.Roll bonding ensures dimensional precision but suffers from weakened interfaces due to brittle intermetallic compounds(IMCs).Explosive-roll bonding balances efficiency and quality,yet risks IMCs regrowth during reheating.Diffusion bonding minimizes deformation but requires prolonged processing.Analysis of elemental diffusion and compound formation reveals that coexisting TiC and Fe‒Ti IMCs degrade interfacial strength,while interlayers effectively suppress brittle phases.Experimental results highlight that rolling temperatures and interlayer selection critically influence shear strength and tensile properties.The corrugated-flat rolling(CFR)technique enhances mechanical interlocking and diffusion,achieving superior interface bonding strength.Future research should prioritize optimizing process parameters to control IMCs,developing eco-friendly methods,and revealing dynamic interface evolution to research highperformance and large-scale titanium/steel clad plates.
