Microbridge testing was used to measure the Young's modulus and residual stress of metallic films. Samples of freestanding NiFe film microbridge were fabricated by microelectromechanical systems. Special ceramic shaf...Microbridge testing was used to measure the Young's modulus and residual stress of metallic films. Samples of freestanding NiFe film microbridge were fabricated by microelectromechanical systems. Special ceramic shaft structure was designed to solve the problem of getting the load-deflection curve of NiFe film microbridge by the Nanoindenter XP system with normal Berkovich probe. Theoretical analysis of load-deflection curves of the microbridges was proposed to evaluate the Young's modulus and residual stress of the films simultaneously. The calculated results based on experimental measurements show that the average Young's modulus and residual stress for the electroplated NiFe films are 203.2 GPa and 333.0 MPa, respectively, while the Young's modulus measured by the Nano-hardness method is 209.6:1:11.8 GPa for the thick NiFe film with silicon substrate.展开更多
Microbridge testing is used to measure the Young's modulus and residual stresses of metallic films.Nickel film microbridges with widths of several hundred microns are fabricated by Microelectromechanical Systems.I...Microbridge testing is used to measure the Young's modulus and residual stresses of metallic films.Nickel film microbridges with widths of several hundred microns are fabricated by Microelectromechanical Systems.In order to measure the mechanical properties of nickel film microbridges,special shaft structure is designed to solve the problem of getting the load--deflection curves of metal film microbridge by Nanoin--denter XP system with normal Berkovich probe.Theoretical analysis of the micro--bridge load--deflection curve is proposed to evaluate the Young's modulus and residual stress of the films simultaneously.The calculated results based on the experimental measurements show that the average Young's modulus and residual stress are around 190GPa and 175MPa respectively,while the Young's modulus measured by Nano-hardness method on nickel film with silicon substrate is 186.8±7.34GPa.展开更多
One-dimensional(1-D) nanomaterials with superior specific capacity, higher rate capability, better cycling peroperties have demonstrated significant advantages for high-performance Li-ion batteries and supercapacito...One-dimensional(1-D) nanomaterials with superior specific capacity, higher rate capability, better cycling peroperties have demonstrated significant advantages for high-performance Li-ion batteries and supercapacitors. This review describes some recent developments on the rechargeable electrodes by using 1-D nanomaterials(such as Li Mn2O4 nanowires, carbon nanofibers, Ni Mo O4 · n H2O nanorods, V2O5 nanoribbons,carbon nanotubes, etc.). New preparation methods and superior electrochemical properties of the 1-D nanomaterials including carbon nanotube(CNT), some oxides, transition metal compounds and polymers, and their composites are emphatically introduced. The VGCF/Li Fe PO4/C triaxial nanowire cathodes for Li-ion battery present a positive cycling performance without any degradation in almost theoretical capacity(160 m Ah/g).The Si nanowire anodes for Li-ion battery show the highest known theoretical charge capacity(4277 m Ah/g),that is about 11 times lager than that of the commercial graphite(372 m Ah/g). The SWCNT/Ni foam electrodes for supercapacitor display small equivalent series resistance(ESR, 52 m?) and impressive high power density(20 k W/kg). The advantages and challenges associated with the application of these materials for energy conversion and storage devices are highlighted.展开更多
In recent years, the emerging cardiac tissue engineering provides a new therapeutic method for heart diseases. And in the tissue engineering, the scaffold material which can mimic the structure of the extracellular ma...In recent years, the emerging cardiac tissue engineering provides a new therapeutic method for heart diseases. And in the tissue engineering, the scaffold material which can mimic the structure of the extracellular matrix properly is a key factor. The rapid expansion of nano-scaffolds during the past ten years has led to new perspectives and advances in biomedical research as well as in clinical practice. Here we search articles published in recent years extensively on cardiac tissue engineering scaffold materials and nanotechnology. And we review the traditional scaffold materials and the advances of the nano-scaffolds in cardiac tissue engineering. A thorough understanding of the nano-scaffolds would enable us to better exploit technologies to research the ideal scaffold material, and promote the cardiac tissue engineering using in the clinical practice as soon as possible.展开更多
The counter-meshing gears (CMG) discriminator is a mechanically coded lock, which is used to prevent the occurrence of High Consequence Events. This paper advanced a new kind of self-assembly metal CMG discriminator...The counter-meshing gears (CMG) discriminator is a mechanically coded lock, which is used to prevent the occurrence of High Consequence Events. This paper advanced a new kind of self-assembly metal CMG discriminator based on multi-exposure LiGA like process and sacrificial layer process. The new CMG discriminator has the following characters except low cost: 1) it has only discrimination teeth sections; 2) the thickness of each gear layer exceeds one hundred micrometers; 3) it is axially driven by a separate dectronic magnetic micromotor directly; 4) its CMG is made of metal and is batch fabricated in the assembled state; 5) it is prevented from rotating in the opposite direction by pawl/ratchet wheel mechanism; 6) it has simpler structure. This device has better strength and reliability in abnormal environment compared to the existing surface micro machining (SMM) discriminator.展开更多
If an external point charge and the movable charges of an isolated quantum-dot cellular automata (QCA) cell have the same polarity, the point charge greatly affects the polarization (P) of the cell only when it is in ...If an external point charge and the movable charges of an isolated quantum-dot cellular automata (QCA) cell have the same polarity, the point charge greatly affects the polarization (P) of the cell only when it is in a narrow band with periodically changing width. The center of the band is on a radius R circle. The ratio of R to the electric charge (q) is a constant determined by the parameters of the cell. A QCA cell can be used as charge detector based on the above phenomenon.展开更多
基金Key Fundamental Research and Development Program (G1999033103) partly supported bY the National Natural Science Foundation of China under Grant Nos. 50275096 , 10402023+1 种基金 the Nanometer Technology Program of Science and Technology Committee of Shanghai (0215 nml04 , 0352 nm014), Postdoctoral Science Foundation of China (No. 20040350476) the Doctoral Training Foundation of National Education Commission of China.
文摘Microbridge testing was used to measure the Young's modulus and residual stress of metallic films. Samples of freestanding NiFe film microbridge were fabricated by microelectromechanical systems. Special ceramic shaft structure was designed to solve the problem of getting the load-deflection curve of NiFe film microbridge by the Nanoindenter XP system with normal Berkovich probe. Theoretical analysis of load-deflection curves of the microbridges was proposed to evaluate the Young's modulus and residual stress of the films simultaneously. The calculated results based on experimental measurements show that the average Young's modulus and residual stress for the electroplated NiFe films are 203.2 GPa and 333.0 MPa, respectively, while the Young's modulus measured by the Nano-hardness method is 209.6:1:11.8 GPa for the thick NiFe film with silicon substrate.
基金This work was supported by the National Key Fundamental Research and Development Program(No.G1999033103),The measurements were conducted at the State Key Laboratory of Nonlinear Mechanics(LNM),Institute of Mechanics,Chinese Academy of Sciences.
文摘Microbridge testing is used to measure the Young's modulus and residual stresses of metallic films.Nickel film microbridges with widths of several hundred microns are fabricated by Microelectromechanical Systems.In order to measure the mechanical properties of nickel film microbridges,special shaft structure is designed to solve the problem of getting the load--deflection curves of metal film microbridge by Nanoin--denter XP system with normal Berkovich probe.Theoretical analysis of the micro--bridge load--deflection curve is proposed to evaluate the Young's modulus and residual stress of the films simultaneously.The calculated results based on the experimental measurements show that the average Young's modulus and residual stress are around 190GPa and 175MPa respectively,while the Young's modulus measured by Nano-hardness method on nickel film with silicon substrate is 186.8±7.34GPa.
基金supported by the National Natural Science Foundation of China(No.5073000809ZR1414800)+3 种基金Science and Technology Commission of Shanghai MunicipalityChina(No.1052nm02000 and 09JC1407400)Shanghai Research Fund for the Post-doctoral Program(No.10R21414700)China Postdoctoral Science Foundation funded project(No.20100470710)
文摘One-dimensional(1-D) nanomaterials with superior specific capacity, higher rate capability, better cycling peroperties have demonstrated significant advantages for high-performance Li-ion batteries and supercapacitors. This review describes some recent developments on the rechargeable electrodes by using 1-D nanomaterials(such as Li Mn2O4 nanowires, carbon nanofibers, Ni Mo O4 · n H2O nanorods, V2O5 nanoribbons,carbon nanotubes, etc.). New preparation methods and superior electrochemical properties of the 1-D nanomaterials including carbon nanotube(CNT), some oxides, transition metal compounds and polymers, and their composites are emphatically introduced. The VGCF/Li Fe PO4/C triaxial nanowire cathodes for Li-ion battery present a positive cycling performance without any degradation in almost theoretical capacity(160 m Ah/g).The Si nanowire anodes for Li-ion battery show the highest known theoretical charge capacity(4277 m Ah/g),that is about 11 times lager than that of the commercial graphite(372 m Ah/g). The SWCNT/Ni foam electrodes for supercapacitor display small equivalent series resistance(ESR, 52 m?) and impressive high power density(20 k W/kg). The advantages and challenges associated with the application of these materials for energy conversion and storage devices are highlighted.
文摘In recent years, the emerging cardiac tissue engineering provides a new therapeutic method for heart diseases. And in the tissue engineering, the scaffold material which can mimic the structure of the extracellular matrix properly is a key factor. The rapid expansion of nano-scaffolds during the past ten years has led to new perspectives and advances in biomedical research as well as in clinical practice. Here we search articles published in recent years extensively on cardiac tissue engineering scaffold materials and nanotechnology. And we review the traditional scaffold materials and the advances of the nano-scaffolds in cardiac tissue engineering. A thorough understanding of the nano-scaffolds would enable us to better exploit technologies to research the ideal scaffold material, and promote the cardiac tissue engineering using in the clinical practice as soon as possible.
文摘The counter-meshing gears (CMG) discriminator is a mechanically coded lock, which is used to prevent the occurrence of High Consequence Events. This paper advanced a new kind of self-assembly metal CMG discriminator based on multi-exposure LiGA like process and sacrificial layer process. The new CMG discriminator has the following characters except low cost: 1) it has only discrimination teeth sections; 2) the thickness of each gear layer exceeds one hundred micrometers; 3) it is axially driven by a separate dectronic magnetic micromotor directly; 4) its CMG is made of metal and is batch fabricated in the assembled state; 5) it is prevented from rotating in the opposite direction by pawl/ratchet wheel mechanism; 6) it has simpler structure. This device has better strength and reliability in abnormal environment compared to the existing surface micro machining (SMM) discriminator.
文摘If an external point charge and the movable charges of an isolated quantum-dot cellular automata (QCA) cell have the same polarity, the point charge greatly affects the polarization (P) of the cell only when it is in a narrow band with periodically changing width. The center of the band is on a radius R circle. The ratio of R to the electric charge (q) is a constant determined by the parameters of the cell. A QCA cell can be used as charge detector based on the above phenomenon.