PolycrystaUine SnO2 thin films were deposited on sapphire substrates at 450℃ under different ambient oxygen pressures by pulsed laser deposition technique. The effect of ambient oxygen pressure on the structural, opt...PolycrystaUine SnO2 thin films were deposited on sapphire substrates at 450℃ under different ambient oxygen pressures by pulsed laser deposition technique. The effect of ambient oxygen pressure on the structural, optical and electrical properties of SnO2 thin films was studied. X-my diffraction and Hall measurements show that increasing the ambient oxygen pressure can improve crystallization of the films and decrease resistivity of the films. A violet emission peak centered at 409 nm was observed from photoluminescence measurements for SnO2 films under deposition ambient oxygen pressure above 5 Pa, which is related to the improvement of crystalline of the films.展开更多
We have observed transverse electric(TE)and transverse magnetic(TM)intersubband infrared absorption peaks in GaAs/AlGaAs step multiquantum wells(SMQW).The energy splitting between TE and TM is 13meV.The high conversio...We have observed transverse electric(TE)and transverse magnetic(TM)intersubband infrared absorption peaks in GaAs/AlGaAs step multiquantum wells(SMQW).The energy splitting between TE and TM is 13meV.The high conversion efficiency of second harmonic signal due to intersubband transition in the GaAs/AlGaAs SMQW with a waveguiding surface-emitting structure have been obtained.The second harmonic generation(SffG)obeys wave vector conservation and propagates perpendicular to the waveguide surface which shows that the nonlinear polarization field for SHG may be TE as well as TM active.The existence of strong surface-emitting second harmonic signal also offers solid evidence of TE polarization active intersubband transition in GaAs/AlGaAs SMQW structure.展开更多
We report the fabrication of high temperature superconducting YBa_(2)Cu_(3)O_(7-x) thin films on CaNdA1O_(4)(100) substrate by pulsed laser deposition.Films have excellent features.X-ray diffraction patterns show that...We report the fabrication of high temperature superconducting YBa_(2)Cu_(3)O_(7-x) thin films on CaNdA1O_(4)(100) substrate by pulsed laser deposition.Films have excellent features.X-ray diffraction patterns show that thin films are epitaxial with c-axis orientation normal to the surface of su bstrate.The four-terminal measurements indicate the zero resistance temperature of 92.1 K,and transition width of 0.7K,the critical current density of 3×10^(6)A/cm^(2)at 77K and under zero magnetic field.展开更多
A new method for measuring surface plasmon(SP)at a metal surface is presented.When exciting a surface plasmon at a metal surface,the metal film will be heated by SP,which leads to changes in its resistance;therefore,t...A new method for measuring surface plasmon(SP)at a metal surface is presented.When exciting a surface plasmon at a metal surface,the metal film will be heated by SP,which leads to changes in its resistance;therefore,the dispersion of SP can be measured by this change.This method has several advantages:it is simpler,convenient,more sensitive and reliable than other known methods,and capable of using nonpolarized light.展开更多
The properties of intersubband transition of GaAs/A1_(x)Ga_(1-x)As multiple quantum wells with various well widths and doped-well concentrations have been studied.Both theoretical and experimental results are in good ...The properties of intersubband transition of GaAs/A1_(x)Ga_(1-x)As multiple quantum wells with various well widths and doped-well concentrations have been studied.Both theoretical and experimental results are in good agreement.For the appropriate well width and higher doping concentration,we directly observed two intersubband absorption peaks from E_(1)→E_(2) and E_(2)→E_(3) transitions in well.The experimental results and theoretical analysis are given.展开更多
With the adoption of competency reconstructing path of functional analysis in the organizational behavior theory,and the consideration of the core mission and attributes of educational organizations plus the urgency f...With the adoption of competency reconstructing path of functional analysis in the organizational behavior theory,and the consideration of the core mission and attributes of educational organizations plus the urgency for digital transformation,this paper concludes four pillar competencies for teachers:curriculum development and teaching competency,human-computer collaboration competency,effective moral education competency,and self-growth competency.From the perspective of supporting the digital transformation in education,curriculum development and teaching competency is the premise and guarantee of“learning-centered”;and human-computer collaboration competency is the transformation direction of teachers’information and communications technology capabilities in smart environments;effective moral education competency determines the primary role of teachers in the process of digital transformation;and self-growth competency is the purpose and means of digital existence.Teacher education needs to face up to the current problems in teacher capacity development and reshape teacher education around the core competencies required by digital transformation.展开更多
The microarrays of 20-base oligonucleotide with different concentrations are detected before and after hybridization by the oblique-incidence reflectivity difference (OI-RD) method. The experimental results prove that...The microarrays of 20-base oligonucleotide with different concentrations are detected before and after hybridization by the oblique-incidence reflectivity difference (OI-RD) method. The experimental results prove that OI-RD is a label-free method which can not only distinguish the concentration difference of oligonucleotides before and after the hybridization but also detect the hybridization of short oligonucleotides. At present the OI-RD method can detect 0.39 μmol/L 20-base oligonucleotide or less. These results suggest that the OI-RD method is a promising and potential technique for label-free detection of biological microarrays.展开更多
Mouse-Immunoglobulin G(mouse-IgG) with different concentrations in a range from 1000 to 0.0128 μg/mL and a specific hybridization with goat anti-mouse IgG were detected successfully by using an oblique-incidence refl...Mouse-Immunoglobulin G(mouse-IgG) with different concentrations in a range from 1000 to 0.0128 μg/mL and a specific hybridization with goat anti-mouse IgG were detected successfully by using an oblique-incidence reflectivity difference(OI-RD) method.Two detection signals,consisting of an imaginary part(Im{Δp-Δs}) and a real part(Re{Δp-Δs}) of OI-RD,were obtained simultaneously.The detection results of hybridization by OI-RD were in accord with that of traditional fluorescent scans.In particular,we label-freely detected the washed mouse-IgG microarray with a series of concentrations and acquired a linear correlation between OI-RD intensities and the protein concentrations in logarithmic coordinates.The detection sensitivity of OI-RD can reach 14 fg.These experimental results suggest that the OI-RD method has potential applications in proteomics and clinical diagnosis.展开更多
We label-free and real-time detected three interaction processes of antigen-antibodies,Human Immunoglobulin G(IgG),Rabbit IgG,and Mouse IgG as the targets,and Goat Anti-human IgG,Goat Anti-rabbit IgG,and Goat Anti-mou...We label-free and real-time detected three interaction processes of antigen-antibodies,Human Immunoglobulin G(IgG),Rabbit IgG,and Mouse IgG as the targets,and Goat Anti-human IgG,Goat Anti-rabbit IgG,and Goat Anti-mouse IgG as the probe,by the Oblique-incidence Reflectivity Difference(OIRD) method.The interaction dynamic curves of the OIRD signal,corresponding to the interaction processes of antigen-antibodies,are generated.The reaction times from beginning to equilibrium state are about 1800,900,and 1200 s for Human IgG,Rabbit IgG,and Mouse IgG,respectively.The experimental results demonstrate that the OIRD method not only can distinguish biomolecular interactions,but also can be used in real-time detection of interactions and dynamic processes of biomolecules.展开更多
The entire interaction process between anti-mouse immunoglobulin-G (IgG) and mouse IgG with a concentration range from 1 to 0.25 mg/mL has been label-free detected by the oblique incidence reflectivity difference (OIR...The entire interaction process between anti-mouse immunoglobulin-G (IgG) and mouse IgG with a concentration range from 1 to 0.25 mg/mL has been label-free detected by the oblique incidence reflectivity difference (OIRD) method.We achieved the two-dimensional scanning images of OIRD Re{△ p △s } intensities before and after interactions as well as the curves of reaction dynamic processes.The experimental results suggest that OIRD method not only can label-free distinguish the different concentrations of proteins and detect biological microarrays,but also can real-time monitor the kinetic processes of biomolecular interactions.展开更多
Reduced graphene oxide thin films were fabricated on quartz by spray coating method using a stable dispersion of reduced graphene oxide in N,N-Dimethylformamide.The dispersion was produced by chemical reduction of gra...Reduced graphene oxide thin films were fabricated on quartz by spray coating method using a stable dispersion of reduced graphene oxide in N,N-Dimethylformamide.The dispersion was produced by chemical reduction of graphene oxide,and the film thickness was controlled with the amount of spray volume.AFM measurements revealed that the thin films have near-atomically flat surface.The chemical and structural parameters of the samples were analyzed by Raman and XPS studies.It was found that the thin films show electrical conductivity with good optical transparency in the visible to near infrared region.The sheet resistance of the films can be significantly reduced by annealing in vacuum and reach 58 k?with a light transmittance of 68.69%at 550 nm.The conductive transparent properties of the reduced graphene oxide thin films would be useful to develop flexible electronics.展开更多
基金This work was financially supported by the National Natural Science Foundation of China (No. 50532090).
文摘PolycrystaUine SnO2 thin films were deposited on sapphire substrates at 450℃ under different ambient oxygen pressures by pulsed laser deposition technique. The effect of ambient oxygen pressure on the structural, optical and electrical properties of SnO2 thin films was studied. X-my diffraction and Hall measurements show that increasing the ambient oxygen pressure can improve crystallization of the films and decrease resistivity of the films. A violet emission peak centered at 409 nm was observed from photoluminescence measurements for SnO2 films under deposition ambient oxygen pressure above 5 Pa, which is related to the improvement of crystalline of the films.
基金Supported by the National Natural Science Foundation of China.
文摘We have observed transverse electric(TE)and transverse magnetic(TM)intersubband infrared absorption peaks in GaAs/AlGaAs step multiquantum wells(SMQW).The energy splitting between TE and TM is 13meV.The high conversion efficiency of second harmonic signal due to intersubband transition in the GaAs/AlGaAs SMQW with a waveguiding surface-emitting structure have been obtained.The second harmonic generation(SffG)obeys wave vector conservation and propagates perpendicular to the waveguide surface which shows that the nonlinear polarization field for SHG may be TE as well as TM active.The existence of strong surface-emitting second harmonic signal also offers solid evidence of TE polarization active intersubband transition in GaAs/AlGaAs SMQW structure.
基金the National Center for Research and Development on Superconductivity of China。
文摘We report the fabrication of high temperature superconducting YBa_(2)Cu_(3)O_(7-x) thin films on CaNdA1O_(4)(100) substrate by pulsed laser deposition.Films have excellent features.X-ray diffraction patterns show that thin films are epitaxial with c-axis orientation normal to the surface of su bstrate.The four-terminal measurements indicate the zero resistance temperature of 92.1 K,and transition width of 0.7K,the critical current density of 3×10^(6)A/cm^(2)at 77K and under zero magnetic field.
文摘A new method for measuring surface plasmon(SP)at a metal surface is presented.When exciting a surface plasmon at a metal surface,the metal film will be heated by SP,which leads to changes in its resistance;therefore,the dispersion of SP can be measured by this change.This method has several advantages:it is simpler,convenient,more sensitive and reliable than other known methods,and capable of using nonpolarized light.
基金This research was supported by National Natural Science Foundation。
文摘The properties of intersubband transition of GaAs/A1_(x)Ga_(1-x)As multiple quantum wells with various well widths and doped-well concentrations have been studied.Both theoretical and experimental results are in good agreement.For the appropriate well width and higher doping concentration,we directly observed two intersubband absorption peaks from E_(1)→E_(2) and E_(2)→E_(3) transitions in well.The experimental results and theoretical analysis are given.
文摘With the adoption of competency reconstructing path of functional analysis in the organizational behavior theory,and the consideration of the core mission and attributes of educational organizations plus the urgency for digital transformation,this paper concludes four pillar competencies for teachers:curriculum development and teaching competency,human-computer collaboration competency,effective moral education competency,and self-growth competency.From the perspective of supporting the digital transformation in education,curriculum development and teaching competency is the premise and guarantee of“learning-centered”;and human-computer collaboration competency is the transformation direction of teachers’information and communications technology capabilities in smart environments;effective moral education competency determines the primary role of teachers in the process of digital transformation;and self-growth competency is the purpose and means of digital existence.Teacher education needs to face up to the current problems in teacher capacity development and reshape teacher education around the core competencies required by digital transformation.
基金supported by the National Basic Research Program of China (Grant No. 2007CB935700)
文摘The microarrays of 20-base oligonucleotide with different concentrations are detected before and after hybridization by the oblique-incidence reflectivity difference (OI-RD) method. The experimental results prove that OI-RD is a label-free method which can not only distinguish the concentration difference of oligonucleotides before and after the hybridization but also detect the hybridization of short oligonucleotides. At present the OI-RD method can detect 0.39 μmol/L 20-base oligonucleotide or less. These results suggest that the OI-RD method is a promising and potential technique for label-free detection of biological microarrays.
基金supported by the National Basic Research Program of China (Grant No. 2007CB935700)
文摘Mouse-Immunoglobulin G(mouse-IgG) with different concentrations in a range from 1000 to 0.0128 μg/mL and a specific hybridization with goat anti-mouse IgG were detected successfully by using an oblique-incidence reflectivity difference(OI-RD) method.Two detection signals,consisting of an imaginary part(Im{Δp-Δs}) and a real part(Re{Δp-Δs}) of OI-RD,were obtained simultaneously.The detection results of hybridization by OI-RD were in accord with that of traditional fluorescent scans.In particular,we label-freely detected the washed mouse-IgG microarray with a series of concentrations and acquired a linear correlation between OI-RD intensities and the protein concentrations in logarithmic coordinates.The detection sensitivity of OI-RD can reach 14 fg.These experimental results suggest that the OI-RD method has potential applications in proteomics and clinical diagnosis.
基金supported by the National Basic Research Program of China (Grant No. 2007CB935701)
文摘We label-free and real-time detected three interaction processes of antigen-antibodies,Human Immunoglobulin G(IgG),Rabbit IgG,and Mouse IgG as the targets,and Goat Anti-human IgG,Goat Anti-rabbit IgG,and Goat Anti-mouse IgG as the probe,by the Oblique-incidence Reflectivity Difference(OIRD) method.The interaction dynamic curves of the OIRD signal,corresponding to the interaction processes of antigen-antibodies,are generated.The reaction times from beginning to equilibrium state are about 1800,900,and 1200 s for Human IgG,Rabbit IgG,and Mouse IgG,respectively.The experimental results demonstrate that the OIRD method not only can distinguish biomolecular interactions,but also can be used in real-time detection of interactions and dynamic processes of biomolecules.
基金supported by the National Basic Research Program of China(2007CB935701)
文摘The entire interaction process between anti-mouse immunoglobulin-G (IgG) and mouse IgG with a concentration range from 1 to 0.25 mg/mL has been label-free detected by the oblique incidence reflectivity difference (OIRD) method.We achieved the two-dimensional scanning images of OIRD Re{△ p △s } intensities before and after interactions as well as the curves of reaction dynamic processes.The experimental results suggest that OIRD method not only can label-free distinguish the different concentrations of proteins and detect biological microarrays,but also can real-time monitor the kinetic processes of biomolecular interactions.
基金supported by the National Key Basic Research Program of China(Grant No.2013CBA01703)the National Natural Science Foundation of China(Grant No.11174355)+2 种基金Teknologiateollisuus TT-100the European Union’s Seventh Framework Programme(Grant No.631610)Aalto University(Finland)
文摘Reduced graphene oxide thin films were fabricated on quartz by spray coating method using a stable dispersion of reduced graphene oxide in N,N-Dimethylformamide.The dispersion was produced by chemical reduction of graphene oxide,and the film thickness was controlled with the amount of spray volume.AFM measurements revealed that the thin films have near-atomically flat surface.The chemical and structural parameters of the samples were analyzed by Raman and XPS studies.It was found that the thin films show electrical conductivity with good optical transparency in the visible to near infrared region.The sheet resistance of the films can be significantly reduced by annealing in vacuum and reach 58 k?with a light transmittance of 68.69%at 550 nm.The conductive transparent properties of the reduced graphene oxide thin films would be useful to develop flexible electronics.
