Chemical bond properties of YBa 2Cu 3O 7 were studied by using the average ba nd-gap model. The calculated results show that the covalency of Cu(1)-O bond i s 0.406, and one of Cu(2)-O is 0.276. Mssbauer isomer shi...Chemical bond properties of YBa 2Cu 3O 7 were studied by using the average ba nd-gap model. The calculated results show that the covalency of Cu(1)-O bond i s 0.406, and one of Cu(2)-O is 0.276. Mssbauer isomer shifts of 57Fe in Y-123 were calculated by the chemical surrounding factor h v defined b y covalency and electronic polarizability. The charge-state and site of Fe were determined. The relation between the coupling constant of electron-phonon inte raction and covalency is employed to explain that the Cu(2)-O plane is more im portant than the Cu(1)-O chain on the superconductivity in the Y-123 compound s.展开更多
Homogeneity of powder blend is essential to obtain uniform contents for the tablets and capsules.Near-infrared(NIR)spectroscopy with fiber-optic probe was used as an on-line technique for monitoring the homogeneity of...Homogeneity of powder blend is essential to obtain uniform contents for the tablets and capsules.Near-infrared(NIR)spectroscopy with fiber-optic probe was used as an on-line technique for monitoring the homogeneity of pharmaceutical blend during the blending process instead of the traditional techniques,such as high performance liquid chromatograph(HPLC)method.In this paper NIRS with a SabIR difuse reflectance fiber optic probe was used to monitor the blending process of coptis powder and lactose(excipient)with different contents,and further qualitative methods,like similarity,moving block of standard deviation and mean square were used for calculation purposes with the ollected spectra after the pretreatment of multiplicative signal correction(MSC)and second derivative.Correlation spectrum was used for the wavelength selection.Four different coptis were blended with lactose separately to validate the proposed method,and the blending process of "liu wei di huang"pill was also simulated in bottles to verify this method on multiple herbal blends.The overall results suggest that NIRS is a simple,efective and noninvasive technique can be sucssfuly applied to the determination of homogeneity in the herbal blend.展开更多
文摘Chemical bond properties of YBa 2Cu 3O 7 were studied by using the average ba nd-gap model. The calculated results show that the covalency of Cu(1)-O bond i s 0.406, and one of Cu(2)-O is 0.276. Mssbauer isomer shifts of 57Fe in Y-123 were calculated by the chemical surrounding factor h v defined b y covalency and electronic polarizability. The charge-state and site of Fe were determined. The relation between the coupling constant of electron-phonon inte raction and covalency is employed to explain that the Cu(2)-O plane is more im portant than the Cu(1)-O chain on the superconductivity in the Y-123 compound s.
基金support from China Postdoctoral Science Foundation Special Funded Project (2013T60604)Zhejiang Provincial Public Welfare Application Project of China (2012C21102)is gratefully acknowledged.
文摘Homogeneity of powder blend is essential to obtain uniform contents for the tablets and capsules.Near-infrared(NIR)spectroscopy with fiber-optic probe was used as an on-line technique for monitoring the homogeneity of pharmaceutical blend during the blending process instead of the traditional techniques,such as high performance liquid chromatograph(HPLC)method.In this paper NIRS with a SabIR difuse reflectance fiber optic probe was used to monitor the blending process of coptis powder and lactose(excipient)with different contents,and further qualitative methods,like similarity,moving block of standard deviation and mean square were used for calculation purposes with the ollected spectra after the pretreatment of multiplicative signal correction(MSC)and second derivative.Correlation spectrum was used for the wavelength selection.Four different coptis were blended with lactose separately to validate the proposed method,and the blending process of "liu wei di huang"pill was also simulated in bottles to verify this method on multiple herbal blends.The overall results suggest that NIRS is a simple,efective and noninvasive technique can be sucssfuly applied to the determination of homogeneity in the herbal blend.
