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Search Results: 1 - 10 of 197831 matches for " Q H Wu "
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The structure of Lennard-Jones nanowires encapsulated by carbon nanotubes
W. Q. Wu,Q. H. Yuan,D. Y. Sun
Physics , 2012,
Abstract: Molecular dynamics simulations have been used to investigate the structures of Lennard-Jones (LJ) nanowires (NWs) encapsulated by carbon nanotubes (CNTs). We found that, when the radius of CNTs is small, the structures of NWs are quite simple, {\it i.e,} only multishell NWs are formed. For CNTs with larger radius, the structure of NWs becomes much richer. In addition to crystal and multishell NWs, three new kinds of NWs are found, {\it i.e,} a hybrid NW with a crystal core coated by a few shells, a crystal NW with droplet-like pits on the side of NW, and a multishell NW with droplet-like pits on the side of NW. The 'phase' diagram, which describes the structure change with the number of LJ atoms and the interaction between NWs and CNTs, is also obtained.
A dimerized spin fluid in a one-dimensional electron system
Y. Z. Zhang,C. Q. Wu,H. Q. Lin
Physics , 2001, DOI: 10.1103/PhysRevB.65.115101
Abstract: The ground state of a one-dimensional Hubbard model with a bond-charge attraction W term at half-filling is investigated by the density matrix renormalization group method. It is confirmed that the spin gap will be closed at U>8W. But the long-range bond order wave survives even when the spin gap is closed. It indicates that the ground state is a novel dimerized spin fluid at U>8W. By a charge-spin transformation, it is shown that there should be a dimerized metallic phase at U<-8W. Furthermore, it is found that the Hubbard interaction U enhances initially the dimerization for a weak bond charge attraction W whereas it reduces monotonously the dimerization for a stronger bond charge attraction W.
Study of the ionic Peierls-Hubbard model using density matrix renormalization group methods
Y. Z. Zhang,C. Q. Wu,H. Q. Lin
Physics , 2004, DOI: 10.1103/PhysRevB.72.125126
Abstract: Density matrix renormalization group methods are used to investigate the quantum phase diagram of a one-dimensional half-filled ionic Hubbard model with bond-charge attraction, which can be mapped from the Su-Schrieffer-Heeger-type electron-phonon coupling at the antiadiabatic limit. A bond order wave (dimerized) phase which separates the band insulator from the Mott insulator always exists as long as electron-phonon coupling is present. This is qualitatively different from that at the adiabatic limit. Our results indicate that electron-electron interaction, ionic potential and quantum phonon fluctuations combine in the formation of the bond-order wave phase.
Chemiluminescence Behavior of Luminol-KIO4-Ag Nanoparticles System and Its Analytical Applications  [PDF]
S. F. Li, H. Y. Wang, X. Min, L. Zhang, J. Wang, J. Du, J. Q. Zhang, P. Wei, Z. Q. Wang, H. Zhang, X. W. Wu
Journal of Biomedical Science and Engineering (JBiSE) , 2014, DOI: 10.4236/jbise.2014.76033
Abstract: It was found that silver nanoparticles could strongly enhance the chemiluminescence (CL) of the luminol-KIO4 system in the presence of Co2+. The most intensive CL signals were obtained with silver nanoparticles in diameter of 22 nm. The studies of UV-visible spectra and CL spectra were carried out to explore the possible CL enhancement mechanism. Moreover, the influences of 17 amino acids and 25 organic compounds on the luminol-KIO4-Co2+-Ag NPs CL system were studied by a flow injection procedure, which led to an effective method to detect these compounds.
Phonon Effects on Spin-Charge Separation in One Dimension
W. Q. Ning,Hui Zhao,C. Q. Wu,H. Q. Lin
Physics , 2005, DOI: 10.1103/PhysRevLett.96.156402
Abstract: Phonon effects on spin-charge separation in one dimension are investigated through the calculation of one-electron spectral functions in terms of the recently developed cluster perturbation theory together with an optimized phonon approach. It is found that the retardation effect due to the finiteness of phonon frequency suppresses the spin-charge separation and eventually makes it invisible in the spectral function. By comparing our results with experimental data of TTF-TCNQ, it is observed that the electron-phonon interaction must be taken into account when interpreting the ARPES data.
Unsaturated fatty acid: Metabolism, synthesis and gene regulation
Q Wu, T Liu, H Liu, G Zheng
African Journal of Biotechnology , 2009,
Abstract: In both plants and animals, unsaturated fatty acids are considered to be essential membrane components. Also they play key roles in many cellular events. The synthesis and metabolism of unsaturated fatty acid are very complex processes, involving a variety of enzymes and regulated pathways. Most recently, research has focused on identifying genes modulating unsaturated fatty acids and studying the metabolism and synthesis at both transcriptional and post-translational levels. The key enzymes and regulated pathways involved in either the metabolism or the synthesis of fatty acid have been identified.
Nebulized liposomal gadobenate dimeglumine contrast formulation for magnetic resonance imaging of larynx and trachea
Wei X, Wu H, Lu Q, Xu J, Xu Y
International Journal of Nanomedicine , 2011, DOI: http://dx.doi.org/10.2147/IJN.S25546
Abstract: ulized liposomal gadobenate dimeglumine contrast formulation for magnetic resonance imaging of larynx and trachea Original Research (2547) Total Article Views Authors: Wei X, Wu H, Lu Q, Xu J, Xu Y Published Date December 2011 Volume 2011:6 Pages 3383 - 3391 DOI: http://dx.doi.org/10.2147/IJN.S25546 Xiaohui Wei1,2, Huawei Wu3, Qing Lu3, Jianrong Xu3, Yuhong Xu1,2 1School of Biomedical Engineering and Med-X Research Institute; 2School of Pharmacy, Shanghai Jiao Tong University; 3Department of Radiology, Renji Hospital affiliated to Shanghai Jiao Tong University, Shanghai, People's Republic of China Background: To develop a lipid-stabilized contrast formulation containing gadobenate dimeglumine for clear visualization of the mucosal surfaces of the larynx and trachea for early diagnosis of disease by magnetic resonance imaging. Methods: The contrast formulation was prepared by loading gadobenate dimeglumine into egg phosphotidylcholine, cholesterol, and sterylamine nanoliposomes using the dehydration-rehydration method. The liposomal contrast formulation was ultrasonically nebulized, and the deposition and coating pattern on explanted pig laryngeal and tracheal segments was examined by inductively coupled plasma atomic emission spectroscopy. The sizes of the nebulized droplets were characterized by photon correlation spectroscopy. The contrast-enhanced mucosal surface images of the larynx and trachea were obtained in a 3.0T magnetic resonance scanner using a T1-weighted spectral presaturation inversion recovery sequence. Results: Various cationic liposome formulations were compared for their stabilization effects on the droplets containing gadobenate dimeglumine. The liposomes composed of egg phosphotidylcholine, cholesterol, and sterylamine in a molar ratio of 1:1:1 were found to enable the most efficient nebulization and the resulting droplet sizes were narrowly distributed. They also resulted in the most even coating on the laryngeal and tracheal lumen surfaces and produced significant contrast enhancement along the mucosal surface. Such contrast enhancement could help clearer visualization of several disease states, such as intraluminal protrusions, submucosal nodules, and craters. Conclusion: This lipid-stabilized magnetic resonance imaging contrast formulation may be useful for improving mucosal surface visualization and early diagnosis of disease originating in the mucosal surfaces of the larynx and trachea.
Fast Training of Support Vector Machines Using Error-Center-Based Optimization
LMeng,QHWu,
L. Meng
,Q. H. Wu

国际自动化与计算杂志 , 2005,
Abstract: This paper presents a new algorithm for Support Vector Machine (SVM) training, which trains a machine based on the cluster centers of errors caused by the current machine. Experiments with various training sets show that the computation time of this new algorithm scales almost linear with training set size and thus may be applied to much larger training sets, in comparison to standard quadratic programming (QP) techniques.
Tree ring-based reconstruction of October to November runoffs in the Jiaolai River since 1826
L. Ma,T. X. Liu,Q. Wu,L. H. Ji
Hydrology and Earth System Sciences Discussions , 2012, DOI: 10.5194/hessd-9-65-2012
Abstract: The Horqin Sandy Land is a typical desertification region in China hounded by ecological and environmental problems, which continue to affect economic and social development.Hence,hydrological climate changes in this region need to be investigated. The current study reconstructed the runoff sequences in the southwest edge of the LiaoHe River into the XiaWa station of the JiaoLai River during the months of October to November from 1826 to 2005. A comprehensive timeline for the regional tree wheel width of the Horqin Sandy Land was employed. The timeline has been in use for 183 yr. For the past 180 yr, the runoff has experienced six and four consecutive Feng and dry sections, respectively. From 1982 to 2005, the runoff reached the longest section of a continuous low-flow runoff, with the mean average runoff amounting to only 63.58% of the entire period. Runoff has 3-, 11-, 15-, 24-, and 30-yr quasi-periodic variations, consistent with changes in similar areas worldwide. The period of 1826 to 1917 presents a more gentle change. In 1956, the runoff increased, and then significantly decreased for nearly 50 yr. The drop rate is 1.7766 million m3/10 yr, which shows a consistent downward trend with the precipitation (14.74 mm/10 yr). The overall reduction in precipitation accounts for 29.86% of the initial value, which is far less than 75.58% of the runoff. If the runoff and precipitation drop continue, more extensive and longer ecological and environmental problems are foreseen to occur.
An Improved Motion Detection Method for Real-Time Surveillance
Nan Lu,Jihong Wang,Q.H. Wu,Li Yang
IAENG International Journal of Computer Science , 2008,
Abstract:
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