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Search Results: 1 - 10 of 137673 matches for " LIU Hai-yang "
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Steroidal and pregnane glycosides from Ypsilandra thibetica
Hai-Yang Liu,Chang-Xiang Chen,Yi Lu,Jun-Yun Yang,Wei Ni
Natural Products and Bioprospecting , 2012, DOI: 10.1007/s13659-011-0039-z
Abstract: The whole plants of Ypsilandra thibetica have been analyzed as part of a systematic study on saponin constituents of medicinal plants. This has resulted in the isolation of two new bisdesmosidic furostanol saponins, named ypsilandroside P (1) and ypsilandroside Q (2), and one new pregnane glycoside, named ypsilandroside R (3), together with nine known steroidal glycosides. Their structures were elucidated on the basis of extensive spectroscopic analysis, including that of 2D NMR data, and the results of acidic hydrolysis. Ypsilandroside P (1) was cytotoxicity against two human tumor cell lines.
2, 9-Diphenylamino-1,10-phenanthroline
Hai-Yang Liu,Chi-Fong Luo,Kuo-Shen Chuang,Wen-Jwu Wang
Molecules , 2001, DOI: 10.3390/m230
Abstract: No abstract available
Copper 1,14:7,8-Diethenotetrapyrido-[2,1,6-de:2',1',6'-gh:2'',1'',6'''-na][1,3,5,8,10,12]hexaazacyclotetradecine Trifluoroacetate
Wen-Jwu Wang,Hai-Yang Liu,Kuo-Shen Chuang,Chi-Fong Luo
Molecules , 2000, DOI: 10.3390/m133
Abstract: No abstract available
Pseudoscalar glueball mass from $\eta$-$\eta'$-$G$ mixing
Cheng, Hai-Yang;Li, Hsiang-nan;Liu, Keh-Fei
High Energy Physics - Phenomenology , 2008, DOI: 10.1103/PhysRevD.79.014024
Abstract: We deduce the mass of the pseudoscalar glueball $G$ from an $\eta$-$\eta'$-$G$ mixing formalism based on the anomalous Ward identity for transition matrix elements. With the inputs from the recent KLOE experiment, we find a solution for the pseudoscalar glueball mass around $(1.4\pm 0.1)$ GeV, which is fairly insensitive to a range of inputs with or without Okubo-Zweig-Iizuka-rule violating effects. This affirms that $\eta(1405)$, having a large production rate in the radiative $J/\Psi$ decay and not seen in $\gamma\gamma$ reactions, is indeed a leading candidate for the pseudoscalar glueball. Other relevant quantities including the anomaly and pseudoscalar density matrix elements are obtained. The decay widths for $G\to \gamma\gamma$, $\ell^+\ell^-$ are also predicted.
Dibenzyl sulfoxide
Yun-Xiu Zeng,Zhi-Guang Xu,Qing-Guang Zhan,Hai-Yang Liu
Acta Crystallographica Section E , 2011, DOI: 10.1107/s1600536810052165
Abstract: There are two independent molecules in the asymmetric unit of the title compound, C14H14OS, which have asymmetric S—C bonds [1.791 (5) and 1.804 (5) in one molecule and 1.798 (5) and 1.804 (5) in the other]. The long axes of the molecules are directed along the crystallographic b axis.
Benzyl 2-ethylhexyl sulfoxide
Xu Zhi-Guang,Liu Hai-Yang,Gu Guo-Bang,Xu Xuan
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809044328
Abstract: The molecule of the title compound, C15H24OS, shows S conformations for the S atom and the asymmetric C atom of the isooctyl group. The long axes of the molecules are directed along the c axis. In the crystal structure, the molecules are linked by weak intermolecular bifurcated C—H...O hydrogen bonds.
N-Phenyl-4-(8-phenyl-4,5-dihydro-1,2-benzoxazolo[4,5-d]thiazol-2-yl)piperidine-1-carboxamide
De-Jin Hu,Ming Liu,Tong-Hui Huang,Hai-Yang Tu
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809021023
Abstract: In the title molecule, C26H24N4O2S, the dihedral angle between the isoxazole ring and the adjoining benzene ring is 21.4 (5)°, and between the isoxazole ring and the thiazole ring is 14.3 (4)°. The piperidine ring is in a chair conformation. In the crystal structure, molecules are linked by intermolecular N—H...O and weak C—H...O hydrogen bonds into one-dimensional chains along [001].
Dichlorido(4,5-diazafluoren-9-one-κ2N,N′)palladium(II)
Zhi-Guang Xu,Hai-Yang Liu,Qing-Guang Zhan,Jian Chen
Acta Crystallographica Section E , 2009, DOI: 10.1107/s1600536809035272
Abstract: The structure of the title compound, [PdCl2(C11H6N2O)], shows a nearly square-planar geometry for the PdII atom within a Cl2N2 donor set.
Polarized Parton Distribution Functions Reexamined
Hai-Yang Cheng,Hung Hsiang Liu,Chung-Yi Wu
Physics , 1995, DOI: 10.1103/PhysRevD.53.2380
Abstract: The hard-gluonic contribution to the first moment of the polarized proton structure function $g_1^p(x)$ is dependent of the factorization convention chosen in defining the quark spin density and the hard cross section for photon-gluon scattering. Two extremes of interest, namely gauge-invariant and chiral-invariant factorization schemes, are considered. We show that in order to satisfy the positivity constraint for sea and gluon polarizations, the polarized valence quark distributions should fully account for the observed $g_1^p(x)$ at $x\gsim 0.2\,$. This together with the first-moment and perturbative QCD constraints puts a pertinent restriction on the shape of $\Delta u_v(x)$ and $\Delta d_v(x)$. The spin-dependent sea distribution in the gauge-invariant factorization scheme is extracted from the data of $g_1^p(x)$. It is shown in the chiral invariant scheme that it is possible to interpret the $g_1^p(x)$ data with anomalous gluonic contributions, yet a best least $\chi^2$ fit to the data implies a gluon spin distribution which violates the positivity condition $|\Delta G(x)|\leq G(x)$. We then propose a more realistic set of parton spin distributions with sea polarization and with a moderate value of $\Delta G$. The polarized parton distributions in this work are presented in the next-to-leading order of QCD at the scale $Q^2=10\,{\rm GeV}^2\,$. Predictions for the polarized structure functions $g_1^n(x)$ of the neutron and $g_1^d(x)$ of the deuteron are given.
Pseudoscalar glueball mass from $η$-$η'$-$G$ mixing
Hai-Yang Cheng,Hsiang-nan Li,Keh-Fei Liu
Physics , 2008, DOI: 10.1103/PhysRevD.79.014024
Abstract: We deduce the mass of the pseudoscalar glueball $G$ from an $\eta$-$\eta'$-$G$ mixing formalism based on the anomalous Ward identity for transition matrix elements. With the inputs from the recent KLOE experiment, we find a solution for the pseudoscalar glueball mass around $(1.4\pm 0.1)$ GeV, which is fairly insensitive to a range of inputs with or without Okubo-Zweig-Iizuka-rule violating effects. This affirms that $\eta(1405)$, having a large production rate in the radiative $J/\Psi$ decay and not seen in $\gamma\gamma$ reactions, is indeed a leading candidate for the pseudoscalar glueball. Other relevant quantities including the anomaly and pseudoscalar density matrix elements are obtained. The decay widths for $G\to \gamma\gamma$, $\ell^+\ell^-$ are also predicted.
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