The△I = 2 and △I = 4 staggering parameters of transition energies Eγfor normally deformed positive parity ground bands in232 Th and236,238 U nuclei are studied in framework of the symplectic extension of the intera...The△I = 2 and △I = 4 staggering parameters of transition energies Eγfor normally deformed positive parity ground bands in232 Th and236,238 U nuclei are studied in framework of the symplectic extension of the interacting vector boson model. The model parameters are obtained from the fitting procedure between the calculated excitation energies and the corresponding experimental ones. The staggering parameters represent the finite difference approximations to higher order derivatives dnEγ/d Inof the γ-ray transition energies in a△I = 2 and △I = 4 bands, which yielding multipoint formulae. The first order derivative(two-point formula) provides us with information about the dynamical moment of inertia. The staggering oscillation for the fourth order derivative(five-point formula) is about 0.5 Ke V and is even larger than that in superdeformed bands. The quite similarity in dynamical moments of inertia of the isotopes236,238 U up to high spin states indicate that the phenomenon of identical bands is not restricted to superdeformed bands.展开更多
Based on the comparison with the Earth, using the LB magneticfield model, the distribution of O+ ion originating from the ionosphere in the Martian magnetosphere is theoretically studied under different conditions of ...Based on the comparison with the Earth, using the LB magneticfield model, the distribution of O+ ion originating from the ionosphere in the Martian magnetosphere is theoretically studied under different conditions of the tail-like magnetic field. The results show that the tail-like magnetic field has influence on the O+ ion flux in the Martian magnetotail: (ⅰ) the O+ ion flux in the Martian tail will increase if the tail-like magnetic field increases; when the tail-like magnetic field increases from 5 nT to 20 nT, the O+ ion flux increases 3 times in the region of 2.8 Rm in the Martian tail; and (ⅱ) the O+ ion flux decreases with increasing intrinsic moment; when the intrinsic moment increases about 5 times, the flux decreases to one fourth in the region of 2.8 Rm in the Martian tail. According to the data on the O+ ion flux and theoretical result in this paper, the deduced Martian intrinsic moment is about 2×1021 Gcm3. This is consistent with the most recent observation by the USA satellite MGS.展开更多
目的利用分子拓扑结构探讨归肺和大肠经中药成分“印迹模板”的特征,并进行实验验证,确定归肺和大肠经可能的物质基础。方法以普通高等教育“十三五”国家级规划教材《中药学》为基准,为排除其他经络如肝经、肾经等混合归经的影响,对44...目的利用分子拓扑结构探讨归肺和大肠经中药成分“印迹模板”的特征,并进行实验验证,确定归肺和大肠经可能的物质基础。方法以普通高等教育“十三五”国家级规划教材《中药学》为基准,为排除其他经络如肝经、肾经等混合归经的影响,对443味中药(不包含附药)进行归纳且只确定归肺和大肠经中药,再通过查阅中国知网和中药系统药理学数据库与分析平台(Traditional Chinese Medicine Systems Pharmacology Database and Analysis Platform,TCMSP),归纳总结出归肺和大肠经中药化学成分,并对其中相同的化学成分进行整理、删减、合并,计算分子连接性指数(molecular connectivity index,MCI);运用夹角余弦法计算出各成分MCI与总体平均MCI的相似度,确定成分部位和对照品;建立相似度与保留时间的关系,进行中药与对照品的HPLC指纹图谱的印迹性比较,从而确定归肺和大肠经可能表征的化学结构特征。结果共获得11味中药的886种化学成分,黄酮、蒽醌、鞣质类成分的相似度较高,且在药材中分布集中,故选取其中相似度排名依次为5、8、10、16、40、44、49的7个成分:大黄素-1-O-β-D-葡萄糖苷、大黄酚-8-O-β-D-葡萄糖苷、大黄素-8-O-β-D-吡喃葡萄糖苷、3,3’-二甲基鞣花酸-4’-O-葡萄糖苷、山柰苷、芦丁、山柰酚-3-O-芸香糖苷,平均MCI的相似度为0.99508~0.99920,保留时间为39.63~60.14 min,基于定量结构-性质关系/定量结构-保留时间关系(quantitative structure-property relationship/quantitative structure-retention relationship,QSPR/QSRR)原理,对二者进行线性回归,相关系数R=0.8662(P<0.01);7个成分和9味药材的总量统计矩的一阶矩的15%范围分别为[44.46 min,46.50 min]、[39.70 min,47.08 min],二者重叠,则有85%把握认为可用7个对照品成分表征归肺和大肠经的中药成分的“印迹模板”特征。结论归肺和大肠经的中药成分可以用黄酮、蒽醌和鞣酸类成分进行“印迹模板”特征的表征。展开更多
基金Supported by National Natural Science Foundation of China(11201083)Natural Science Foundation of Guangdong Province(S2013010016270)Foundation of College Students Innovation Project(XJ201511845094)
文摘The△I = 2 and △I = 4 staggering parameters of transition energies Eγfor normally deformed positive parity ground bands in232 Th and236,238 U nuclei are studied in framework of the symplectic extension of the interacting vector boson model. The model parameters are obtained from the fitting procedure between the calculated excitation energies and the corresponding experimental ones. The staggering parameters represent the finite difference approximations to higher order derivatives dnEγ/d Inof the γ-ray transition energies in a△I = 2 and △I = 4 bands, which yielding multipoint formulae. The first order derivative(two-point formula) provides us with information about the dynamical moment of inertia. The staggering oscillation for the fourth order derivative(five-point formula) is about 0.5 Ke V and is even larger than that in superdeformed bands. The quite similarity in dynamical moments of inertia of the isotopes236,238 U up to high spin states indicate that the phenomenon of identical bands is not restricted to superdeformed bands.
基金This work was supported by the National Natural Science Foundation of China ( Grant No. 49884002) .
文摘Based on the comparison with the Earth, using the LB magneticfield model, the distribution of O+ ion originating from the ionosphere in the Martian magnetosphere is theoretically studied under different conditions of the tail-like magnetic field. The results show that the tail-like magnetic field has influence on the O+ ion flux in the Martian magnetotail: (ⅰ) the O+ ion flux in the Martian tail will increase if the tail-like magnetic field increases; when the tail-like magnetic field increases from 5 nT to 20 nT, the O+ ion flux increases 3 times in the region of 2.8 Rm in the Martian tail; and (ⅱ) the O+ ion flux decreases with increasing intrinsic moment; when the intrinsic moment increases about 5 times, the flux decreases to one fourth in the region of 2.8 Rm in the Martian tail. According to the data on the O+ ion flux and theoretical result in this paper, the deduced Martian intrinsic moment is about 2×1021 Gcm3. This is consistent with the most recent observation by the USA satellite MGS.
文摘目的利用分子拓扑结构探讨归肺和大肠经中药成分“印迹模板”的特征,并进行实验验证,确定归肺和大肠经可能的物质基础。方法以普通高等教育“十三五”国家级规划教材《中药学》为基准,为排除其他经络如肝经、肾经等混合归经的影响,对443味中药(不包含附药)进行归纳且只确定归肺和大肠经中药,再通过查阅中国知网和中药系统药理学数据库与分析平台(Traditional Chinese Medicine Systems Pharmacology Database and Analysis Platform,TCMSP),归纳总结出归肺和大肠经中药化学成分,并对其中相同的化学成分进行整理、删减、合并,计算分子连接性指数(molecular connectivity index,MCI);运用夹角余弦法计算出各成分MCI与总体平均MCI的相似度,确定成分部位和对照品;建立相似度与保留时间的关系,进行中药与对照品的HPLC指纹图谱的印迹性比较,从而确定归肺和大肠经可能表征的化学结构特征。结果共获得11味中药的886种化学成分,黄酮、蒽醌、鞣质类成分的相似度较高,且在药材中分布集中,故选取其中相似度排名依次为5、8、10、16、40、44、49的7个成分:大黄素-1-O-β-D-葡萄糖苷、大黄酚-8-O-β-D-葡萄糖苷、大黄素-8-O-β-D-吡喃葡萄糖苷、3,3’-二甲基鞣花酸-4’-O-葡萄糖苷、山柰苷、芦丁、山柰酚-3-O-芸香糖苷,平均MCI的相似度为0.99508~0.99920,保留时间为39.63~60.14 min,基于定量结构-性质关系/定量结构-保留时间关系(quantitative structure-property relationship/quantitative structure-retention relationship,QSPR/QSRR)原理,对二者进行线性回归,相关系数R=0.8662(P<0.01);7个成分和9味药材的总量统计矩的一阶矩的15%范围分别为[44.46 min,46.50 min]、[39.70 min,47.08 min],二者重叠,则有85%把握认为可用7个对照品成分表征归肺和大肠经的中药成分的“印迹模板”特征。结论归肺和大肠经的中药成分可以用黄酮、蒽醌和鞣酸类成分进行“印迹模板”特征的表征。
