In this paper,the phenomenon on collapsible tube displacement oscillation,a new behavior of the collapsible tube puisatile flow has been studied.The experiments show that the collapsible tube,in which the flow is peri...In this paper,the phenomenon on collapsible tube displacement oscillation,a new behavior of the collapsible tube puisatile flow has been studied.The experiments show that the collapsible tube,in which the flow is periodic puisatile in the upstream,will oscillate as a simple supported beam when it is collapsed to certain extent,and that if the tube is collapsed continue,this oscillation will tend to weak and completely disappear lastly.An analytical model corresponding to the collapsible tube displacement oscillation and its governed equations are set up from the experiment background.By analysing the model and solving the equations, the collapsible tube displacement oscillation pattern and the oscillation occurring or disappearing criterion are obtained.The results predicted by this study are in agreement with those observed from experiment phenomena.展开更多
Fe_(3)GaTe_(2)has attracted significant interest due to its intrinsic room-temperature ferromagnetism,yet its magnetic interactions remain debated.We thoroughly investigate the magnetism of Fe_(3)GaTe_(2)using critica...Fe_(3)GaTe_(2)has attracted significant interest due to its intrinsic room-temperature ferromagnetism,yet its magnetic interactions remain debated.We thoroughly investigate the magnetism of Fe_(3)GaTe_(2)using critical analysis,nitrogen–vacancy(NV)center magnetometry,and Density Function Theory(DFT).Our critical phenomenon analysis with exponents[β=0.3706(9),=1.32(6),σ=4.7(2)]and DFT calculations reveal competition between itinerant and localized spins driven by anisotropic coupling,which can be attributed to a net charge transfer of approximately 0.22 electrons from Fe^(3+)to surrounding Ge/Te atoms.As confirmed by NV center magnetometry,the ferromagnetism in Fe_(3)GaTe_(2)remains robust even in thin-layered sheet of 16 nm(corresponding to approximately 20 layers).The out-of-plane ferromagnetism in thin Fe_(3)GaTe_(2)sheets is stabilized due to the distinct spin interaction energies between intralayers(J_(1)~66.74 meV andJ_(2)~17.33 meV)and interlayers(J_(z)~3.78 meV).In addition,the constant energy contour profiles near the Fermi surface of Fe_(3)GaTe_(2)suggest the presence of both hole and electron pockets with a distorted contour around the K/K′point,indicating hexagonal trigonal warping effects.Furthermore,the layer-resolved electronic band structure uncovers a layer–valley coupling near the Fermi surface,with bands at valleys K and K′associated with different layers.These findings pave way for advanced electronic applications operating above-room-temperature.展开更多
文摘In this paper,the phenomenon on collapsible tube displacement oscillation,a new behavior of the collapsible tube puisatile flow has been studied.The experiments show that the collapsible tube,in which the flow is periodic puisatile in the upstream,will oscillate as a simple supported beam when it is collapsed to certain extent,and that if the tube is collapsed continue,this oscillation will tend to weak and completely disappear lastly.An analytical model corresponding to the collapsible tube displacement oscillation and its governed equations are set up from the experiment background.By analysing the model and solving the equations, the collapsible tube displacement oscillation pattern and the oscillation occurring or disappearing criterion are obtained.The results predicted by this study are in agreement with those observed from experiment phenomena.
基金supported by the National Key R&D Program of China(Grant No.2024YFA1611103)the National Natural Science Foundation of China(Grant Nos.12350410367,12074360,12374128,12074386,12250410238,and 62150410438)+3 种基金the Alliance of International Science Organizations(Grant Nos.ANSO-VF-2022-03 and ANSO-VF-2024-03)Anhui Provincial Major S&T Project(Grant No.s202305a12020005)A portion of this work was supported by the Basic Research Program of the Chinese Academy of Sciences Based on Major Scientific Infrastructures(Grant No.JZHKYPT-2021-08)the High Magnetic Field Laboratory of Anhui Province under Contract No.AHHM-FX-2020-02.
文摘Fe_(3)GaTe_(2)has attracted significant interest due to its intrinsic room-temperature ferromagnetism,yet its magnetic interactions remain debated.We thoroughly investigate the magnetism of Fe_(3)GaTe_(2)using critical analysis,nitrogen–vacancy(NV)center magnetometry,and Density Function Theory(DFT).Our critical phenomenon analysis with exponents[β=0.3706(9),=1.32(6),σ=4.7(2)]and DFT calculations reveal competition between itinerant and localized spins driven by anisotropic coupling,which can be attributed to a net charge transfer of approximately 0.22 electrons from Fe^(3+)to surrounding Ge/Te atoms.As confirmed by NV center magnetometry,the ferromagnetism in Fe_(3)GaTe_(2)remains robust even in thin-layered sheet of 16 nm(corresponding to approximately 20 layers).The out-of-plane ferromagnetism in thin Fe_(3)GaTe_(2)sheets is stabilized due to the distinct spin interaction energies between intralayers(J_(1)~66.74 meV andJ_(2)~17.33 meV)and interlayers(J_(z)~3.78 meV).In addition,the constant energy contour profiles near the Fermi surface of Fe_(3)GaTe_(2)suggest the presence of both hole and electron pockets with a distorted contour around the K/K′point,indicating hexagonal trigonal warping effects.Furthermore,the layer-resolved electronic band structure uncovers a layer–valley coupling near the Fermi surface,with bands at valleys K and K′associated with different layers.These findings pave way for advanced electronic applications operating above-room-temperature.
