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Search Results: 1 - 10 of 334198 matches for " J. Y. Gan "
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Theory for Gossamer and Resonating Valence Bond Superconductivity
J. Y. Gan,F. C. Zhang,Z. B. Su
Physics , 2003, DOI: 10.1103/PhysRevB.71.014508
Abstract: We use an effective Hamiltonian for two-dimensional Hubbard model including an antiferromagnetic spin-spin coupling term to study recently proposed gossamer superconductivity. We formulate a renormalized mean field theory to approximately take into account the strong correlation effect in the partially projected Gutzwiller wavefucntions. At the half filled, there is a first order phase transition to separate a Mott insulator at large Coulomb repulsion U from a gossamer superconductor at small U. Away from the half filled,the Mott insulator is evolved into an resonating valence bond state, which is adiabatically connected to the gossamer superconductor.
Coexistence of superconductivity and antiferromagnetism in self-doped bilayer t-t'-J model
J. Y. Gan,M. Mori,T. K. Lee,S. Maekawa
Physics , 2008, DOI: 10.1103/PhysRevB.78.094504
Abstract: A self-doped bilayer t-t'-J model of an electron- and a hole-doped planes is studied by the slave-boson mean-field theory. A hopping integral between the differently doped planes, which are generated by a site potential, are renormalized by the electron-electron correlation. We find coexistent phases of antiferromagnetic (AFM) and superconducting orders, although the magnitudes of order parameters become more dissimilar in the bilayer away from half-filling. Fermi surfaces (FS's) with the AFM order show two pockets around the nodal and the anti-nodal regions. These results look like a composite of electron- and hole-doped FS's. In the nodal direction, the FS splitting is absent even in the bilayer system, since one band is flat due to the AFM order.
Spin wave theory for antiferromagnetic XXZ spin model on a triangle lattice in the presence of an external magnetic field
J. Y. Gan,F. C. Zhang,Z. B. Su
Physics , 2002, DOI: 10.1103/PhysRevB.67.144427
Abstract: Spin wave theory is applied to a quantum antiferromagnetic XXZ model on a triangle lattice in the presence of an in-plane magnetic field. The effect of the field is found to enhance the quantum fluctuation and to reduce the sublattice magnetization at the intermediate field strength in the anisotropic case. The possible implication to the field driven quantum phase transition from a spin solid to a spin liquid is discussed.
Superconducting Pairing Symmetries in Anisotropic Triangular Quantum Antiferromagnets
J. Y. Gan,Yan Chen,F. C. Zhang
Physics , 2006, DOI: 10.1103/PhysRevB.74.094515
Abstract: Motivated by the recent discovery of a low temperature spin liquid phase in layered organic compound $\kappa$-(ET)$_2$Cu$_2$(CN)$_3$ which becomes a superconductor under pressure, we examine the phase transition of Mott insulating and superconducting (SC) states in a Hubbard-Heisenberg model on an anisotropic triangular lattice. We use a renormalized mean field theory to study the Gutzwiller projected BCS wavefucntions. The half filled electron system is a Mott insulator at large on-site repulsion $U$, and is a superconductor at a moderate $U$. The symmetry of the SC state depends on the anisotropy, and is gapful with $d_{x^2-y^2}+id_{xy}$ symmetry near the isotropic limit and is gapless with $d_{x^2-y^2}$ symmetry at small anisotropy ratio.
Intraperitoneal injection of magnetic Fe3O4-nanoparticle induces hepatic and renal tissue injury via oxidative stress in mice
Ma P, Luo Q, Chen J, Gan Y, Du J, Ding S, Xi Z, Yang X
International Journal of Nanomedicine , 2012, DOI: http://dx.doi.org/10.2147/IJN.S34349
Abstract: traperitoneal injection of magnetic Fe3O4-nanoparticle induces hepatic and renal tissue injury via oxidative stress in mice Original Research (2153) Total Article Views Authors: Ma P, Luo Q, Chen J, Gan Y, Du J, Ding S, Xi Z, Yang X Published Date September 2012 Volume 2012:7 Pages 4809 - 4818 DOI: http://dx.doi.org/10.2147/IJN.S34349 Received: 29 May 2012 Accepted: 23 July 2012 Published: 05 September 2012 Ping Ma,1,2,* Qing Luo,2,* Jiaoe Chen,1 Yaping Gan,1 Juan Du,2 Shumao Ding,2 Zhuge Xi,3 Xu Yang2 1College of Basic Medical Sciences, Hubei University of Science and Technology, Xianning, People's Republic of China; 2Hubei Key Laboratory of Genetic Regulation and Integrative Biology, College of Life Sciences, Central China Normal University, Wuhan, People's Republic of China; 3Tianjin Institute of Health and Environmental Medicine, Tianjin, People's Republic of China *These authors contributed equally to this work Abstract: Because of its unique magnetic properties, the iron oxide (Fe3O4) nanoparticle has been widely exploited and its application in various fields has promised immense benefits. However, doubts exist over the use of Fe3O4-nanoparticles in human beings. Thus, the aim of the current study was to find out the potential safety range of medical use. Twenty-five Kunming mice were exposed to Fe3O4-nanoparticles via intraperitoneal injection daily for 1 week at doses of 0, 5, 10, 20, and 40 mg/kg. Hepatic and renal tissues were sliced for physiological observation. Injuries were observed in the high-dose groups (20 and 40 mg/kg) compared with the control group (0 mg/kg). Biomarkers of reactive oxygen species, glutathione, malondialdehyde, DNA-protein crosslinks, and 8-hydroxy-2'-deoxyguanosine in the hepatic and renal tissues were detected. Injury to tissues and oxidative damage to cells at the molecular level was found. The safest dose recommended from the results of this study is 5 mg/kg, as we believe this to be an upper limit balancing the benefits and risks for sub-long-term exposure.
In vitro cytotoxicity and induction of apoptosis by silica nanoparticles in human HepG2 hepatoma cells
Lu X, Qian J, Zhou H, Gan Q, Tang W, Lu J, Yuan Y, Liu C
International Journal of Nanomedicine , 2011, DOI: http://dx.doi.org/10.2147/IJN.S24005
Abstract: vitro cytotoxicity and induction of apoptosis by silica nanoparticles in human HepG2 hepatoma cells Original Research (5590) Total Article Views Authors: Lu X, Qian J, Zhou H, Gan Q, Tang W, Lu J, Yuan Y, Liu C Published Date September 2011 Volume 2011:6 Pages 1889 - 1901 DOI: http://dx.doi.org/10.2147/IJN.S24005 Xun Lu2,3, Jiangchao Qian1, Huanjun Zhou2,3, Qi Gan2,3, Wei Tang1, Jingxiong Lu3, Yuan Yuan1,2, Changsheng Liu1–3 1State Key Laboratory of Bioreactor Engineering, 2Key Laboratory for Ultrafine Materials of Ministry of Education, 3Engineering Research Center for Biomedical Materials of Ministry of Education, East China University of Science and Technology, Shanghai, People’s Republic of China Background: Silica nanoparticles have been discovered to exert cytotoxicity and induce apoptosis in normal human cells. However, until now, few studies have investigated the cytotoxicity of silica nanoparticles in tumor cells. Methods: This study investigated the cytotoxicity of 7–50 nm silica nanoparticles in human HepG2 hepatoma cells, using normal human L-02 hepatocytes as a control. Cell nucleus morphology changes, cellular uptake, and expression of procaspase-9, p53, Bcl-2, and Bax, as well as the activity of caspase-3, and intracellular reactive oxygen species and glutathione levels in the silica nanoparticle-treated cells, were analyzed. Results: The antitumor activity of the silica nanoparticles was closely related to particle size, and the antiproliferation activity decreased in the order of 20 nm > 7 nm > 50 nm. The silica nanoparticles were also cytotoxic in a dose- and time-dependent manner. However, the silica nanoparticles showed only slight toxicity in the L-02 control cells, Moreover, in HepG2 cells, oxidative stress and apoptosis were induced after exposure to 7–20 nm silica nanoparticles. Expression of p53 and caspase-3 increased, and expression of Bcl-2 and procaspase-9 decreased in a dose-dependent manner, whereas the expression of Bax was not significantly changed. Conclusion: A mitochondrial-dependent pathway triggered by oxidative stress mediated by reactive oxygen species may be involved in apoptosis induced by silica nanoparticles, and hence cytotoxicity in human HepG2 hepatic cancer cells.
SJ Yang,G Y Gan,LZ Wang,

金属学报(英文版) , 1998,
Abstract: The new technology and equipments used in alumina refinery in PINGGUO ALUMINUM COMPANY were introduced. Problems encountered during early period of its operation and improvements to the process and equipments were discussed. Current opemtion situation and pedect technical and economical figures were also introduced.
Wavelet-based Analysis of Force Signals for Monitoring and Prediction of Cutting Performance in High-speed Milling Processes
L.Y. Zhai,M.J. Er,X. Li,O.P. Gan
Engineering Letters , 2011,
Implicit spatial averaging in inversion of inelastic x-ray scattering data
P. Abbamonte,J. P. Reed,Y. I. Joe,Yu Gan,D. Casa
Physics , 2009, DOI: 10.1103/PhysRevB.80.054302
Abstract: Inelastic x-ray scattering (IXS) now a widely used technique for studying the dynamics of electrons in condensed matter. We previously posed a solution to the phase problem for IXS [P. Abbamonte, et. al., Phys. Rev. Lett. {\bf 92}, 237401 (2004)], that allows explicit reconstruction of the density propagator of a system. The propagator represents, physically, the response of the system to an idealized, point perturbation, so provides direct, real-time images of electron motion with attosecond time resolution and $\AA$-scale spatial resolution. Here we show that the images generated by our procedure, as it was originally posed, are spatial averages over all source locations. Within an idealized, atomic-like model, we show that in most cases a simple relationship to the complete, un-averaged response can still be determined. We illustrate this concept for recent IXS measurements of single crystal graphite.
Composite Fermion Hall Conductance at $ν=1/2$
D-H Lee,Y. Krotov,J. Gan,S. A. Kivelson
Physics , 1996,
Abstract: We show that in the limit of vanishing bare electron effective mass, and in the presence of particle-hole symmetric disorder (which can be of vanishing strength), the composite fermion Hall conductance is constrained to be $-{1\over 2}\frac{e^2}{h}$. We discuss the implications of this results for the existence and nature of a composite Fermi liquid in the lowest Landau level.
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