CdSe:Sm nanocrystals(NCs) were synthesized by a water phase method,and their structures,shapes and optical properties were further characterized.X-ray diffraction(XRD) analysis suggested that both the CdSe and CdSe:Sm...CdSe:Sm nanocrystals(NCs) were synthesized by a water phase method,and their structures,shapes and optical properties were further characterized.X-ray diffraction(XRD) analysis suggested that both the CdSe and CdSe:Sm NCs contained(111),(220) and(311) lattice planes in the zinc blende structure overlapped with the(002),(110) and(112) lattice planes in the wurtzite structure,and the diameters were about 4.2,3.3 and 2.3 nm for CdSe,CdSe:Sm(8%) and CdSe:Sm(10%) NCs,respectively.All of the CdSe:Sm NCs were monodispersed and uniform spherical nanocrystals.The CdSe:Sm(10%) NCs prepared with different reaction times exhibited constant absorption spectra at 430 nm and a fixed emission peak at581 nm.Compared with those of pure CdSe NCs,the fluorescence emission of CdSe:Sm(10%) NCs blueshifted 20-36 nm,and the absorption peak initially redshifted and then blueshifted with the prolongation of reaction time.In addition,the Sm^2+ doping decreased the fluorescence lifetime and increased the quantum yields(QYs) of CdSe NCs.The QYs of CdSe:Sm NCs increased initially and then decreased with the increase in the amount of doped Sm2+.The initial pH and charge compensator concentration also exhibited significantly enhanced fluorescence emission of CdSe:Sm NCs.展开更多
The predominant spectral blueshifting of a sub-picosecond UV laser pulse induced by ultrafast ionization of noble gases was investigated. Spectral measurements were made at various gas densities. Typical quasi-periodi...The predominant spectral blueshifting of a sub-picosecond UV laser pulse induced by ultrafast ionization of noble gases was investigated. Spectral measurements were made at various gas densities. Typical quasi-periodic structures in the blueshifted spectrum were obtained. The observations were in connection with the so-called self-phase modulation of laser pulses in the ultrafast ionization process which was simply simulated with an ADK （Ammosov-Delone-Krainov） ionization model. Some quantitative information can be deduced from the measurements and calculations.展开更多
The transmission spectra of a TiO2-silicone oil suspension in an increasing external electric field are studied. As the electric field increases, the structure of the suspension changes from a disordered one to an ord...The transmission spectra of a TiO2-silicone oil suspension in an increasing external electric field are studied. As the electric field increases, the structure of the suspension changes from a disordered one to an ordered one. Interestingly, the transmission spectra blueshift in this structure-ordering process. Furthermore, the relative transmission spectra exhibit Fano-like asymmetric line shapes. The deviation ratio of each asymmetric line shape increases monotonously as the disorder of the suspension decreases. We suggest that this blueshift phenomenon can be used to characterize the disorder strength of three- dimensional systems.展开更多
The wave function for the spin the early universe is obtained through the adaption of the quantum formalism to one solution of the Wheeler-DeWitt’s equation [1], associated with the wave function of the universe. In ...The wave function for the spin the early universe is obtained through the adaption of the quantum formalism to one solution of the Wheeler-DeWitt’s equation [1], associated with the wave function of the universe. In addition, some observations performed by Stephen Hawking in relation to the vorticity of the universe [2] are used. This wave function for the spin could be used for indirectly to demonstrate the presence of dark matter in the universe.展开更多
In the present paper, photon frequency shift, e.g. gravitational red and blueshift, is described as the electromagnetic influence from gravity waves on photons, e.g. light waves. Previous reports have described the dy...In the present paper, photon frequency shift, e.g. gravitational red and blueshift, is described as the electromagnetic influence from gravity waves on photons, e.g. light waves. Previous reports have described the dynamic electromagnetic processes of the atom, the photon and gravity, and how these characteristics are measured. Results from these reports have been compiled into a theoretical model. The theoretical model describes the mechanism which results in photon frequency shift caused by a gravitational field. The theoretical model gives results similar to General Relativity using Schwarzschild metric. The theoretical model is mapped on black holes.展开更多
The speed away of stars and galaxies is traditionally calculated from the relativistic formula according to the measurement of the redshift. It is demonstrated here another formula for this speed away of stars and gal...The speed away of stars and galaxies is traditionally calculated from the relativistic formula according to the measurement of the redshift. It is demonstrated here another formula for this speed away of stars and galaxies, from this same redshift <em>z</em>. After having exposed critiques on the demonstration and the relativistic use which require the assumption of an expanding universe by itself, it is proposed within the framework of neo-Newtonian mechanics the formula <img src="Edit_5abcd41b-f0f0-4fdd-8d05-07b43d1fa78c.png" alt="" /> where <em>V</em> is the speed from the source. This formula has the double characteristic of being equivalent to relativistic predictions for low redshifts, but of deviating from them by up to 17% for high redshifts. It is consistent with the observation of the anisotropy of the Universe and the Cosmic Microwave Background. It helps to explain Pioneer anomalies. It is compatible with the constancy in the majority of cases of interference phenomena. Finally, it provides a new analysis grid for the observation of supernovae, galaxies and distant pulsars, thus opening up new fields of research on the increase in distances attributed to dark energy and also in other areas of the cosmology.展开更多
The In-N clusters form in the dilute nitride InxGa1-xNy As1-yalloys after annealing.It is found that the formation of the In-N clusters not only raises the N levels lying above the conduction band minimum(CBM)of In Ga...The In-N clusters form in the dilute nitride InxGa1-xNy As1-yalloys after annealing.It is found that the formation of the In-N clusters not only raises the N levels lying above the conduction band minimum(CBM)of In GaA s,but also raises the N levels below the CBM of In GaA s,leading to the variation of the impurity-host interaction.The blueshift of the band gap energy is relative to the variation of the impurity-host interaction.In order to describe the blueshift of the band gap energy due to the formation of the In-N clusters,a model is developed.It is found that the model can describe the blueshift of the band gap energy well.In addition,it is found the blueshift of the band gap energy due to the atom interdiffusion at the interface can be larger than that due to the formation of the In-N clusters.展开更多
Triboelectrification,a process that transforms mechanical energy into electrical energy through friction,holds promise for eco-friendly wastewater treatment.This study delves into the enhancement of tribocatalytic dye...Triboelectrification,a process that transforms mechanical energy into electrical energy through friction,holds promise for eco-friendly wastewater treatment.This study delves into the enhancement of tribocatalytic dye degradation using SrTiO_(3),a material notable for its non-piezoelectric and centrosymmetric properties.The synthesis of uni-and bi-doped SrTiOs particles,achieved through a solid-state reaction at 100℃,results in a high-purity cubic perovskite structure.Doping with rhodium(Rh)and carbon(C)causes crystal lattice contraction,internal stress,and significant oxygen vacancies.These changes notably improve tribocatalytic efficiency under solar irradiation,with Rh-doped SrTiO_(3) demonstrating an impressive degradation rate of approximately 88% for Rhodamine B(RhB),along with reaction rate constants near 0.9 h^(-1) at 554 nm and a noticeable blueshift.This study highlights that defects introduced by doping are integral to this process,boosting catalytic activity through energy state modification and enhancing surface redox radical production.Additionally,these defects are instrumental in generating a flexoelectric field,which markedly influences the separation of electron-hole pairs under solar irradiation.Our findings illuminate the complex interplay between material composition,defect states,and environmental conditions,paving the way for advanced strategies in environmental remediation through optimized tribocatalytic activity.展开更多
基金financially supported by the National Natural Science Foundation of China(No.21364007)the Natural Science Foundation of Inner Mongolia(No.2016MS0201)the Program for Young Talents of Science and Technology of Baotou Teachers College(No.01135003/003)
文摘CdSe:Sm nanocrystals(NCs) were synthesized by a water phase method,and their structures,shapes and optical properties were further characterized.X-ray diffraction(XRD) analysis suggested that both the CdSe and CdSe:Sm NCs contained(111),(220) and(311) lattice planes in the zinc blende structure overlapped with the(002),(110) and(112) lattice planes in the wurtzite structure,and the diameters were about 4.2,3.3 and 2.3 nm for CdSe,CdSe:Sm(8%) and CdSe:Sm(10%) NCs,respectively.All of the CdSe:Sm NCs were monodispersed and uniform spherical nanocrystals.The CdSe:Sm(10%) NCs prepared with different reaction times exhibited constant absorption spectra at 430 nm and a fixed emission peak at581 nm.Compared with those of pure CdSe NCs,the fluorescence emission of CdSe:Sm(10%) NCs blueshifted 20-36 nm,and the absorption peak initially redshifted and then blueshifted with the prolongation of reaction time.In addition,the Sm^2+ doping decreased the fluorescence lifetime and increased the quantum yields(QYs) of CdSe NCs.The QYs of CdSe:Sm NCs increased initially and then decreased with the increase in the amount of doped Sm2+.The initial pH and charge compensator concentration also exhibited significantly enhanced fluorescence emission of CdSe:Sm NCs.
基金National Natural Science Foundation of China(Nos.10474081,10735050)National Basic Research Program of China(973 Program)(No.2007CB815102)
文摘The predominant spectral blueshifting of a sub-picosecond UV laser pulse induced by ultrafast ionization of noble gases was investigated. Spectral measurements were made at various gas densities. Typical quasi-periodic structures in the blueshifted spectrum were obtained. The observations were in connection with the so-called self-phase modulation of laser pulses in the ultrafast ionization process which was simply simulated with an ADK （Ammosov-Delone-Krainov） ionization model. Some quantitative information can be deduced from the measurements and calculations.
文摘The transmission spectra of a TiO2-silicone oil suspension in an increasing external electric field are studied. As the electric field increases, the structure of the suspension changes from a disordered one to an ordered one. Interestingly, the transmission spectra blueshift in this structure-ordering process. Furthermore, the relative transmission spectra exhibit Fano-like asymmetric line shapes. The deviation ratio of each asymmetric line shape increases monotonously as the disorder of the suspension decreases. We suggest that this blueshift phenomenon can be used to characterize the disorder strength of three- dimensional systems.
文摘The wave function for the spin the early universe is obtained through the adaption of the quantum formalism to one solution of the Wheeler-DeWitt’s equation [1], associated with the wave function of the universe. In addition, some observations performed by Stephen Hawking in relation to the vorticity of the universe [2] are used. This wave function for the spin could be used for indirectly to demonstrate the presence of dark matter in the universe.
文摘In the present paper, photon frequency shift, e.g. gravitational red and blueshift, is described as the electromagnetic influence from gravity waves on photons, e.g. light waves. Previous reports have described the dynamic electromagnetic processes of the atom, the photon and gravity, and how these characteristics are measured. Results from these reports have been compiled into a theoretical model. The theoretical model describes the mechanism which results in photon frequency shift caused by a gravitational field. The theoretical model gives results similar to General Relativity using Schwarzschild metric. The theoretical model is mapped on black holes.
文摘The speed away of stars and galaxies is traditionally calculated from the relativistic formula according to the measurement of the redshift. It is demonstrated here another formula for this speed away of stars and galaxies, from this same redshift <em>z</em>. After having exposed critiques on the demonstration and the relativistic use which require the assumption of an expanding universe by itself, it is proposed within the framework of neo-Newtonian mechanics the formula <img src="Edit_5abcd41b-f0f0-4fdd-8d05-07b43d1fa78c.png" alt="" /> where <em>V</em> is the speed from the source. This formula has the double characteristic of being equivalent to relativistic predictions for low redshifts, but of deviating from them by up to 17% for high redshifts. It is consistent with the observation of the anisotropy of the Universe and the Cosmic Microwave Background. It helps to explain Pioneer anomalies. It is compatible with the constancy in the majority of cases of interference phenomena. Finally, it provides a new analysis grid for the observation of supernovae, galaxies and distant pulsars, thus opening up new fields of research on the increase in distances attributed to dark energy and also in other areas of the cosmology.
基金Supported by the National Natural Science Foundation of China under Grant No.61504094Tinjin Research Program of Application Foundation and Advanced Technology under No.15JCYBJC16300Tianjin City High School Science and Technology Fund Planning Project No.20120609
文摘The In-N clusters form in the dilute nitride InxGa1-xNy As1-yalloys after annealing.It is found that the formation of the In-N clusters not only raises the N levels lying above the conduction band minimum(CBM)of In GaA s,but also raises the N levels below the CBM of In GaA s,leading to the variation of the impurity-host interaction.The blueshift of the band gap energy is relative to the variation of the impurity-host interaction.In order to describe the blueshift of the band gap energy due to the formation of the In-N clusters,a model is developed.It is found that the model can describe the blueshift of the band gap energy well.In addition,it is found the blueshift of the band gap energy due to the atom interdiffusion at the interface can be larger than that due to the formation of the In-N clusters.
基金This work was supported by the National Natural Science Foundation of China(No.11974304).
文摘Triboelectrification,a process that transforms mechanical energy into electrical energy through friction,holds promise for eco-friendly wastewater treatment.This study delves into the enhancement of tribocatalytic dye degradation using SrTiO_(3),a material notable for its non-piezoelectric and centrosymmetric properties.The synthesis of uni-and bi-doped SrTiOs particles,achieved through a solid-state reaction at 100℃,results in a high-purity cubic perovskite structure.Doping with rhodium(Rh)and carbon(C)causes crystal lattice contraction,internal stress,and significant oxygen vacancies.These changes notably improve tribocatalytic efficiency under solar irradiation,with Rh-doped SrTiO_(3) demonstrating an impressive degradation rate of approximately 88% for Rhodamine B(RhB),along with reaction rate constants near 0.9 h^(-1) at 554 nm and a noticeable blueshift.This study highlights that defects introduced by doping are integral to this process,boosting catalytic activity through energy state modification and enhancing surface redox radical production.Additionally,these defects are instrumental in generating a flexoelectric field,which markedly influences the separation of electron-hole pairs under solar irradiation.Our findings illuminate the complex interplay between material composition,defect states,and environmental conditions,paving the way for advanced strategies in environmental remediation through optimized tribocatalytic activity.
