首次采用反相高效液相色谱法测定茜草根中1,3,6-trihydroxy-2-methylanthraquinone-3-O-[3-O-acetyl-α-L-rhamnopyranosyl-(1→2)-β-D-glucopyranoside]的含量。色谱柱为Purospher star RP C18色谱柱(250mm×4.6mm,5μm),流动相...首次采用反相高效液相色谱法测定茜草根中1,3,6-trihydroxy-2-methylanthraquinone-3-O-[3-O-acetyl-α-L-rhamnopyranosyl-(1→2)-β-D-glucopyranoside]的含量。色谱柱为Purospher star RP C18色谱柱(250mm×4.6mm,5μm),流动相为甲醇:水:四氢呋喃(65:34.7:0.3),流速为1.0mL/min,检测波长为276nm,柱温为25℃。该方法的线性范围为0.020~0.160μg,r=0.9998,平均回收率为101.5%,RSD为2.0%(n=6)。该方法测定1,3,6-trihydroxy-2-methylanthraquinone-3-O-[3-O-acetyl-α-L-rhamnopyranosyl-(1→2)-β-D-glucopyranoside]含量灵敏、准确、重现性好。展开更多
The crystal structure of 1, l-dichloro-la, 3-diphenyl-l, la, 2, 3-te-trahydro-azirino[2, l-d ] [l, 5]benzothizeapine (C22H17Cl2NS, Mr= 398. 35) has beendetermined. The title compound crystallizes in orthorhombic space...The crystal structure of 1, l-dichloro-la, 3-diphenyl-l, la, 2, 3-te-trahydro-azirino[2, l-d ] [l, 5]benzothizeapine (C22H17Cl2NS, Mr= 398. 35) has beendetermined. The title compound crystallizes in orthorhombic space group Pbca with celldimensions a= 11. 579(3), b= 15. 14O(4), c=2l. 534(5) A, V= 3775. 04(5) A 3, Z= 8, D. = 1' 402g. cm-3, MoKa(λ= 0. 7l073 A ), F (000) = lO64, μ= O. 245mm-1. The structure was solved by using direct methods and refined by full-matrixleast-Squares method, and the final crystallographic discrepancy factor is 0. 046 for4l94 observed rcflections. The molecular backbone is a tricyclic system with the centralseven-membered l, 5-thiazepine ring in twisted boat-like conformation and cis-fused toboth azirine ring and benzene ring.展开更多
In this paper, we built upon the estimating primaries by sparse inversion （EPSI） method. We use the 3D curvelet transform and modify the EPSI method to the sparse inversion of the biconvex optimization and Ll-norm r...In this paper, we built upon the estimating primaries by sparse inversion （EPSI） method. We use the 3D curvelet transform and modify the EPSI method to the sparse inversion of the biconvex optimization and Ll-norm regularization, and use alternating optimization to directly estimate the primary reflection coefficients and source wavelet. The 3D curvelet transform is used as a sparseness constraint when inverting the primary reflection coefficients, which results in avoiding the prediction subtraction process in the surface-related multiples elimination （SRME） method. The proposed method not only reduces the damage to the effective waves but also improves the elimination of multiples. It is also a wave equation- based method for elimination of surface multiple reflections, which effectively removes surface multiples under complex submarine conditions.展开更多
文摘首次采用反相高效液相色谱法测定茜草根中1,3,6-trihydroxy-2-methylanthraquinone-3-O-[3-O-acetyl-α-L-rhamnopyranosyl-(1→2)-β-D-glucopyranoside]的含量。色谱柱为Purospher star RP C18色谱柱(250mm×4.6mm,5μm),流动相为甲醇:水:四氢呋喃(65:34.7:0.3),流速为1.0mL/min,检测波长为276nm,柱温为25℃。该方法的线性范围为0.020~0.160μg,r=0.9998,平均回收率为101.5%,RSD为2.0%(n=6)。该方法测定1,3,6-trihydroxy-2-methylanthraquinone-3-O-[3-O-acetyl-α-L-rhamnopyranosyl-(1→2)-β-D-glucopyranoside]含量灵敏、准确、重现性好。
文摘The crystal structure of 1, l-dichloro-la, 3-diphenyl-l, la, 2, 3-te-trahydro-azirino[2, l-d ] [l, 5]benzothizeapine (C22H17Cl2NS, Mr= 398. 35) has beendetermined. The title compound crystallizes in orthorhombic space group Pbca with celldimensions a= 11. 579(3), b= 15. 14O(4), c=2l. 534(5) A, V= 3775. 04(5) A 3, Z= 8, D. = 1' 402g. cm-3, MoKa(λ= 0. 7l073 A ), F (000) = lO64, μ= O. 245mm-1. The structure was solved by using direct methods and refined by full-matrixleast-Squares method, and the final crystallographic discrepancy factor is 0. 046 for4l94 observed rcflections. The molecular backbone is a tricyclic system with the centralseven-membered l, 5-thiazepine ring in twisted boat-like conformation and cis-fused toboth azirine ring and benzene ring.
基金supported by the National Science and Technology Major Project (No.2011ZX05023-005-008)
文摘In this paper, we built upon the estimating primaries by sparse inversion （EPSI） method. We use the 3D curvelet transform and modify the EPSI method to the sparse inversion of the biconvex optimization and Ll-norm regularization, and use alternating optimization to directly estimate the primary reflection coefficients and source wavelet. The 3D curvelet transform is used as a sparseness constraint when inverting the primary reflection coefficients, which results in avoiding the prediction subtraction process in the surface-related multiples elimination （SRME） method. The proposed method not only reduces the damage to the effective waves but also improves the elimination of multiples. It is also a wave equation- based method for elimination of surface multiple reflections, which effectively removes surface multiples under complex submarine conditions.
