目的:观察银屑平丸对BALB/c小鼠银屑病样模型血清中转化生长因子-β(TGF-β)和白细胞介素10(IL-10)表达的影响,探讨银屑平丸治疗银屑病的可能作用机制。方法:将48只BALB/c雄性小鼠随机分为空白组、模型对照组、银屑平丸高、中、低剂量...目的:观察银屑平丸对BALB/c小鼠银屑病样模型血清中转化生长因子-β(TGF-β)和白细胞介素10(IL-10)表达的影响,探讨银屑平丸治疗银屑病的可能作用机制。方法:将48只BALB/c雄性小鼠随机分为空白组、模型对照组、银屑平丸高、中、低剂量组、雷公藤组,每组8只。所有小鼠背部脱毛后,空白组小鼠外涂凡士林,其余5组小鼠外涂咪喹莫特乳膏,诱发小鼠银屑病样模型;同时予以相应药物进行灌胃干预,连续8 d。观察并记录小鼠背部皮肤皮损面积和严重程度指数(psoriasis area and serenty index,PASI)评分;ELISA法检测小鼠外周血清中TGF-β、IL-10水平;取小鼠背部皮肤组织做病理切片进行组织病理观察。结果:银屑平丸高、中、低剂量组、雷公藤组小鼠背部皮损PASI评分及外周血TGF-β、IL-10含量均明显低于模型对照组,差异有统计学意义(P<0.05)。结论:银屑平丸能降低银屑病样模型小鼠外周血TGF-β、IL-10的表达,这可能是银屑平丸治疗银屑病的作用机制之一。展开更多
An investigation of the optical properties of a hydrogenic donor in spherical parabolic quantum dots hasbeen performed by using the matrix diagonalization method.The optical absorption coefficient between the ground(L...An investigation of the optical properties of a hydrogenic donor in spherical parabolic quantum dots hasbeen performed by using the matrix diagonalization method.The optical absorption coefficient between the ground(L=0) and the first excited state (L=1) have been examined based on the computed energies and wave functions.The results are presented as a function of the incident photon energy for the different values of the confinement strength.These results show the effects of the quantum size and the impurity on the optical absorption coefficient of a donorimpurity quantum dot.展开更多
Binding energiesfor an exciton (X ) trapped in the two-dimensional quantum dot by a negative ion located on the z axis at a distance from the dot plane are calculated by using the method of few-body physics.This confi...Binding energiesfor an exciton (X ) trapped in the two-dimensional quantum dot by a negative ion located on the z axis at a distance from the dot plane are calculated by using the method of few-body physics.This configuration is called a barrier (A-,X) center.The dependence of the binding energy of the ground state of the barrier (A-,X)center on the electron-to-hole mass ratio for a few values of the distance d between the fixed negative ion on the z axis and the dot plane is obtained.We find that when d → 0,the barrier (A-,X) center has not any bound state.We also studied the stability and binding energy of the ground state of the barrier (A-,X) center in a parabolic quantum dot as a function of the distance d between the fixed negative ion on the z axis and the dot plane.展开更多
It is known experimentally that stable charged-exciton complexes can exist in low-dimensional semiconductor nanostructures. Much less is known about the properties of such charged-exciton complexes since three-body pr...It is known experimentally that stable charged-exciton complexes can exist in low-dimensional semiconductor nanostructures. Much less is known about the properties of such charged-exciton complexes since three-body problems are very difficult to be solved, even numerically. Here we introduce the correlated hyperspherical harmonics as basis functions to solve the hyperangular equation for negatively and positively charged excitons (trions) in a harmonic quantum dot. By using this method, we have calculated the energy spectra of the low-lying states of a charged exciton as a function of the radius of quantum dot. Based on symmetry analysis, the level crossover as the dot radius increases can be fully explained as the results of symmetry constraint.展开更多
<Abstract>In this paper,we study four electrons confined in a parabolic quantum dot in the absence of magnetic field,by the exact diagonalization method.The ground-state electronic structures and orbital and spi...<Abstract>In this paper,we study four electrons confined in a parabolic quantum dot in the absence of magnetic field,by the exact diagonalization method.The ground-state electronic structures and orbital and spin angular momenta transitions as a function of the confined strength are investigated.We find that the confinement may cause accidental degeneracies between levels with different low-lying states and the inversion of the energy values.The present results are useful to understand the optical properties and internal electron-electron correlations of quantum dot materials.展开更多
The binding energies of the lowest singlet and triplet states of positively charged excitons confined to a quantum disc are studied using exact diagonalization techniques. We investigate the dependence of the binding ...The binding energies of the lowest singlet and triplet states of positively charged excitons confined to a quantum disc are studied using exact diagonalization techniques. We investigate the dependence of the binding energies on the confinement strength and on the effective electron-to-hole mass ratio. The results we have obtained show that the binding energies are closely correlated to the strength of the confinement potential and the effective electron-to-hole mass ratio.展开更多
<正> The ground and three low-excited states of the hydrogen negative ion confined by a spherical harmonicoscillator potential are studied employing the adiabatic hyperspherical approach method.Total energies ar...<正> The ground and three low-excited states of the hydrogen negative ion confined by a spherical harmonicoscillator potential are studied employing the adiabatic hyperspherical approach method.Total energies are obtainedas a function of the confined potential radii.We find that the confinement may cause accidental degeneracies betweenlevels with different low-excited states and the inversion of the energy values.展开更多
The binding energy of excitons confined to a quantum ring under the influence of perpendicular homogeneous magnetic field is calculated as a function of the ring radius.Calculations are made by using the method of exa...The binding energy of excitons confined to a quantum ring under the influence of perpendicular homogeneous magnetic field is calculated as a function of the ring radius.Calculations are made by using the method of exact diagonalization within the effective-mass approximation.The feature of binding energy of the ground state as a function of the ring radius for several values of the magnetic field has been revealed.The interesting feature of our study is that, in a quantum ring,the geometric structure of excitons may reveal transition.展开更多
文摘目的:观察银屑平丸对BALB/c小鼠银屑病样模型血清中转化生长因子-β(TGF-β)和白细胞介素10(IL-10)表达的影响,探讨银屑平丸治疗银屑病的可能作用机制。方法:将48只BALB/c雄性小鼠随机分为空白组、模型对照组、银屑平丸高、中、低剂量组、雷公藤组,每组8只。所有小鼠背部脱毛后,空白组小鼠外涂凡士林,其余5组小鼠外涂咪喹莫特乳膏,诱发小鼠银屑病样模型;同时予以相应药物进行灌胃干预,连续8 d。观察并记录小鼠背部皮肤皮损面积和严重程度指数(psoriasis area and serenty index,PASI)评分;ELISA法检测小鼠外周血清中TGF-β、IL-10水平;取小鼠背部皮肤组织做病理切片进行组织病理观察。结果:银屑平丸高、中、低剂量组、雷公藤组小鼠背部皮损PASI评分及外周血TGF-β、IL-10含量均明显低于模型对照组,差异有统计学意义(P<0.05)。结论:银屑平丸能降低银屑病样模型小鼠外周血TGF-β、IL-10的表达,这可能是银屑平丸治疗银屑病的作用机制之一。
基金Supported by National Natural Science Foundation of China under Grant No.10775035
文摘An investigation of the optical properties of a hydrogenic donor in spherical parabolic quantum dots hasbeen performed by using the matrix diagonalization method.The optical absorption coefficient between the ground(L=0) and the first excited state (L=1) have been examined based on the computed energies and wave functions.The results are presented as a function of the incident photon energy for the different values of the confinement strength.These results show the effects of the quantum size and the impurity on the optical absorption coefficient of a donorimpurity quantum dot.
基金The project supported by the Natural Science Foundation of Guangdong Province under Grant No. 04009519 and National Natural Science Foundation of China under Grant No. 10475021
文摘Binding energiesfor an exciton (X ) trapped in the two-dimensional quantum dot by a negative ion located on the z axis at a distance from the dot plane are calculated by using the method of few-body physics.This configuration is called a barrier (A-,X) center.The dependence of the binding energy of the ground state of the barrier (A-,X)center on the electron-to-hole mass ratio for a few values of the distance d between the fixed negative ion on the z axis and the dot plane is obtained.We find that when d → 0,the barrier (A-,X) center has not any bound state.We also studied the stability and binding energy of the ground state of the barrier (A-,X) center in a parabolic quantum dot as a function of the distance d between the fixed negative ion on the z axis and the dot plane.
基金supported by National Natural Science Foundation of China under Grant No. 10775035
文摘界限的性质的调查在抛物线的量限制的 D <SUP>−</SUP> 中心声明点与一个垂直磁场的存在为案例被执行了。计算被在有效团的近似以内使用 Hamiltonian 矩阵的数字 diagonalization 的方法执行。地面和一些界限激动的状态的有约束力的精力作为应用磁场力量的一个函数被获得。为很多个低状态的有约束力的精力的详细计算为地力量显示出那不到 B = 2.1 T,在一个量点限制的 D <SUP>−</SUP> 中心拥有二个界限状态,为 2.1 ≤
B 【
2.4 T,在那里存在三个界限状态,等等。在磁场的 D <SUP>−</SUP> 中心量点的进一步相关的特征被提供。
文摘It is known experimentally that stable charged-exciton complexes can exist in low-dimensional semiconductor nanostructures. Much less is known about the properties of such charged-exciton complexes since three-body problems are very difficult to be solved, even numerically. Here we introduce the correlated hyperspherical harmonics as basis functions to solve the hyperangular equation for negatively and positively charged excitons (trions) in a harmonic quantum dot. By using this method, we have calculated the energy spectra of the low-lying states of a charged exciton as a function of the radius of quantum dot. Based on symmetry analysis, the level crossover as the dot radius increases can be fully explained as the results of symmetry constraint.
基金supported by National Natural Science Foundation of China under Grant No.10775035
文摘<Abstract>In this paper,we study four electrons confined in a parabolic quantum dot in the absence of magnetic field,by the exact diagonalization method.The ground-state electronic structures and orbital and spin angular momenta transitions as a function of the confined strength are investigated.We find that the confinement may cause accidental degeneracies between levels with different low-lying states and the inversion of the energy values.The present results are useful to understand the optical properties and internal electron-electron correlations of quantum dot materials.
基金*The project supported by National Natural Science Foundation of China under Grant No. 10475021 and the Natural Science Foundation of Guangdong Province of China under Grant No. 04009519
基金The project supported by National Natural Science Foundation of China under Grant No. 10475021 and the Natured Science Foundation of Guangdong Province of China under Grant No. 04009519
文摘The binding energies of the lowest singlet and triplet states of positively charged excitons confined to a quantum disc are studied using exact diagonalization techniques. We investigate the dependence of the binding energies on the confinement strength and on the effective electron-to-hole mass ratio. The results we have obtained show that the binding energies are closely correlated to the strength of the confinement potential and the effective electron-to-hole mass ratio.
基金The project supported by National Natural Science Foundation of China under Grant No. 10475021 and the Natural Science Foundation of Guangdong Province under Grant No. 04009519
文摘<正> The ground and three low-excited states of the hydrogen negative ion confined by a spherical harmonicoscillator potential are studied employing the adiabatic hyperspherical approach method.Total energies are obtainedas a function of the confined potential radii.We find that the confinement may cause accidental degeneracies betweenlevels with different low-excited states and the inversion of the energy values.
基金The project supported by National Natural Science Foundation of China under Grant No. 10475014 and the Natural Science Foundation of Guangdong Province under Grant No. 04009519
基金supported by National Natural Science Foundation of China under Grant No.10775035
文摘The binding energy of excitons confined to a quantum ring under the influence of perpendicular homogeneous magnetic field is calculated as a function of the ring radius.Calculations are made by using the method of exact diagonalization within the effective-mass approximation.The feature of binding energy of the ground state as a function of the ring radius for several values of the magnetic field has been revealed.The interesting feature of our study is that, in a quantum ring,the geometric structure of excitons may reveal transition.