OALib Journal期刊

ISSN: 2333-9721




2018 ( 3 )

2017 ( 315 )

2016 ( 419 )

2015 ( 4435 )


匹配条件: “WANG Xiao-mei” ,找到相关结果约145350条。
Gang Liu,Xiao-mei Wang,Cong-bin Fan
Acta Crystallographica Section E , 2011, DOI: 10.1107/s1600536811009780
Abstract: In the title compound, C23H14F8N2S, the dihedral angles between the pyrrole and thiophene groups and the almost planar C—C=C—C unit of the cyclopentene ring (r.m.s. deviation = 0.4193 ) are 43.6 (5) and 50.1 (2)°, respectively. The distance of 3.612 (3) between the potentially reactive C atoms of the two heteroaryl substituents is short enough to enable a photocyclization reaction.
Cong-Bin Fan,Xiao-Mei Wang
Acta Crystallographica Section E , 2012, DOI: 10.1107/s1600536811055036
Abstract: The title compound, C26H20N2O, belongs to a new family of organic two-photon absorption materials with triphenylamine and pyridine units. In the molecule, the three benzene rings are arranged in a propeller-like fashion; the dihedral angles between the rings are 80.01 (14), 75.68 (13) and 56.93 (14)°. The pyridine ring is oriented at dihedral angles of 56.24 (14), 48.92 (15) and 22.02 (13)° with respect to the three benzene rings. Weak intermolecular C—H...O hydrogen bonding is present in the crystal structure.
Dipole Coupling Effect of Holographic Fermion in the Background of Charged Gauss-Bonnet AdS Black Hole
Xiao-Mei Kuang,Bin Wang,Jian-Pin Wu
Physics , 2012, DOI: 10.1007/JHEP07(2012)125
Abstract: We investigate the holographic fermions in the charged Gauss-Bonnet $AdS_{d}$ black hole background with the dipole coupling between fermion and gauge field in the bulk. We show that in addition to the strength of the dipole coupling, the spacetime dimension and the higher curvature correction in the gravity background also influence the onset of the Fermi gap and the gap distance. We find that the higher curvature effect modifies the fermion spectral density and influences the value of the Fermi momentum for the appearance of the Fermi surface. There are richer physics in the boundary fermion system due to the modification in the bulk gravity.
Entanglement Entropy as a Probe of the Proximity Effect in Holographic Superconductors
Xiao-Mei Kuang,Eleftherios Papantonopoulos,Bin Wang
Physics , 2014, DOI: 10.1007/JHEP05(2014)130
Abstract: We study the entanglement entropy as a probe of the proximity effect of a superconducting system by using the gauge/gravity duality in a fully back-reacted gravity system. While the entanglement entropy in the superconducting phase is less than the entanglement entropy in the normal phase, we find that near the contact interface of the superconducting to normal phase the entanglement entropy has a different behavior due to the leakage of Cooper pairs to the normal phase. We verify this behavior by calculating the conductivity near the boundary interface.
Building a Holographic Superconductor with Higher-derivative Couplings
Xiao-Mei Kuang,Eleftherios Papantonopoulos,George Siopsis,Bin Wang
Physics , 2013, DOI: 10.1103/PhysRevD.88.086008
Abstract: We discuss the gravitational dual of a holographic superconductor consisting of a U(1) gauge field, a complex scalar field coupled to a charged AdS black hole and a higher-derivative coupling between the U(1) gauge field and the scalar with coupling constant \eta. In the presence of a magnetic field, the system possesses localized spatially dependent droplet solutions which, in the low temperature limit, have smaller critical temperature for \eta>0 than the droplet solutions without the interaction term (\eta=0). In the weak magnetic field limit, the opposite behavior is observed: the critical temperature increases as we increase \eta. We also calculate the energy gap in the probe limit and find that it is larger for \eta<0 than the energy gap in the conventional case (\eta=0).
Dynamical gap from holography in the charged dilaton black hole
Xiao-Mei Kuang,Bin Wang,Jian-Pin Wu
Physics , 2012, DOI: 10.1088/0264-9381/30/14/145011
Abstract: We study the holographic non-relativistic fermions in the presence of bulk dipole coupling in charged dilatonic black hole background. We explore the nontrivial effects of the bulk dipole coupling, the fermion charge as well as the dilaton field on the flat band, the Fermi surface and the emergence of the gap by investigating the spectral function of the non-relativistic fermion system. In particular, we find that the presence of the flat band in the non-relativistic case will suppress the Fermi momentum. Besides, we observe that the effect of the dipole coupling in the dilaton gravity is more explicit. Finally, we consider the non-relativistic fermions at nonzero temperature. A phase transition from insulator to a conducting state is observed as the fermion system becomes hotter.
Eco-friendly Synthesis of Cyclododecanone from Cyclododecatriene  [PDF]
Qi Feng, De-Kai Yuan, Dao-Quan Wang, Xiao-Mei Liang, Jian-Jun Zhang, Jin-Ping Wu, Fu-Heng Chen
Green and Sustainable Chemistry (GSC) , 2011, DOI: 10.4236/gsc.2011.13011
Abstract: An eco-friendly synthesis of cyclododecanone (CDON) from cyclododecatriene (CDT) is described. Selec- tive epoxidation of CDT with hydrogen peroxide using hexadecyl trimethyl ammonium heteropolyphospha- totungstate [(n-C16H33NMe3)3PW4O16, HAHPT] as catalyst and water as solvent followed by the hydrogena- tion on Raney nickel catalyst gave cyclododecanol (CDOL). The latter was oxidized with hydrogen peroxide using HAHPT as catalyst and a mixture of water and t-butanol as solvent to afford CDON. The total yield was 53.4% under the optimum reaction conditions.
Study and application of time-lapse seismic monitoring for the thermal recovery of heavy oil reservoir

WANG Kai-yan,YUN Mei-hou,ZHANG Xiao-mei,

地球物理学进展 , 2008,
Abstract: There are rich heavy oil resources in China,but it is very few for the study on time-lapse seismic monitoring for the thermal recovery of heavy oil in a thin inter-bed reservoir at home and abroad.By analyzing the effect of fire flooding on heavy oil reservoir and using laboratorial result,a thin inter-bed model is built and used for seismic forward modeling of fire flooding reservoir.And a field example is shown.Both of them show that thermal recovery(steam flooding,fire flooding or hot-water flooding) can cause the obvious changes of elastic properties of reservoir rock and pore fluid and the obvious seismic attribute difference.Time-lapse seismic can be used to map the high temperature extent in reservoir,to track the high temperature front and so forth.It is feasible for us to apply time-lapse seismic to the monitoring of thermal recovery of heavy oil reservoir.
2-(Methylsulfanyl)cyclododecanone tosylhydrazone
Xiao-Jing Yan,Xiao-Mei Liang,Shu-Hui Jin,Dao-Quan Wang
Acta Crystallographica Section E , 2008, DOI: 10.1107/s1600536808005515
Abstract: The title compound, C20H32N2O2S2, has been synthesized by the reaction of α-methylsulfanylcyclododecanone and p-toluenesulfonylhydrazine. In the crystal structure, the conformation of the non-benzenoid ring is [3333] and the methylsulfanyl group is in the α-side exo position. The molecules are linked by intermolecular N—H...S hydrogen bonds.
Epidemic spreading with time delay in complex networks
Xin-Jian Xu,Hai-Ou Peng,Xiao-Mei Wang,Ying-Hai Wang
Physics , 2005, DOI: 10.1016/j.physa.2005.11.035
Abstract: We present a modified \emph{susceptible-infected-susceptible} (SIS) model on complex networks, small-world and scale-free, to study epidemic spreading with the effect of time delay which is introduced to the infected phase. Considering the topology of the network, both uniform and degree-dependent delays are studied during the contagion process. We find that the existence of time delay will enhance both outbreaks and prevalence of infectious diseases in the network.

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