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Search Results: 1 - 10 of 18657 matches for " Chenglong Han "
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Finite Difference Simulation of Implosive Collapsing for Aluminum Spherical Shell  [PDF]
Weicheng Bi, Banghai Jiang, Chenglong Han
Journal of Applied Mathematics and Physics (JAMP) , 2018, DOI: 10.4236/jamp.2018.68136
Implosive collapsing for spherical metal shells is a kind of dynamic compressing method, in which high pressure and high compression degree of materials can be attained. In present work, the dynamic process of implosive collapsing for spherical metal shells was regard as spherical symmetry ideally, so one-dimensional spherical symmetric fluid dynamics conservation equations were established, and the finite difference schemes for solving these equations were given. An aluminum spherical shell was assumed, whose inner radius is 4cm and thickness is 2 cm. In numerical simulation, initial centripetal velocities (800, 1000 and 1200 m/s) were used to make aluminum spherical shell collapse. The simulation results show that during the process of implosive collapsing, the material exhibits a compression-expansion-compression pulsation process, and the internal pressure changes and distribution are consistent with the theoretical expectations. The simulation results can be used as a reference for relevant analysis.
Valence-bond-solid order in antiferromagnets with spin-lattice coupling
Chenglong Jia,Jung Hoon Han
Physics , 2005, DOI: 10.1103/PhysRevB.73.172411
Abstract: We propose that a valence-bond-solid (VBS) order can be stabilized in certain two-dimensional antiferromagnets due to spin-lattice coupling. In contrast to the VBS state of the Affleck-Kennedy-Lieb-Tesaki (AKLT) type in which the spin $2S$ and the lattice coordination $z$ must be commensurate, the spin-lattice coupling-induced VBS state can occur when $2S$ is not an integer multiple of $z$. As a concrete example, S=2 spins on the triangular network with $z=6$ is discussed. Within the Schwinger boson mean-field theory it is shown that the ground state is given by the $\sqrt{3}\times\sqrt{3}$ modulation of the valence bond amplitudes for sufficiently strong spin-lattice coupling. Using the corresponding AKLT wave function, we work out the excitation spectrum for this state within the single-mode approximation. The calculated spectrum should provide a new type of collective mode which is distinct from the spin wave excitations of the magnetically ordered ground state.
Lattice-coupled Antiferromagnet on Frustrated Lattices
Chenglong Jia,Jung Hoon Han
Physics , 2004, DOI: 10.1103/PhysRevB.71.212406
Abstract: Lattice-coupled antiferromagnetic spin model is analyzed for a number of frustrated lattices: triangular, Kagome, and pyrochlore. In triangular and Kagome lattices where ground state spins are locally ordered, the spin-lattice interaction does not lead to a static deformation of the lattice. In the pyrochlore structure, spin-lattice coupling supports a picture of the hexagon spin cluster proposed in the recent experiment[S. H. Lee et al. Nature, 418, 856 (2002)]. Through spin-lattice interaction a uniform contraction of the individual hexagons in the pyrochlore lattice can take place and reduce the exchange energy. Residual hexagon-hexagon interaction takes the form of a 3-states Potts model where the preferred directions of the spin-loop directors for nearby hexagons are mutually orthogonal.
Phases of Mott-Hubbard bilayers
Jung Hoon Han,Chenglong Jia
Physics , 2006,
Abstract: A phase diagram of two Mott-Hubbard planes interacting with a short-range Coulomb repulsion is presented. Considering the case of equal amount of doping by holes in one layer as electrons in the other, a holon-doublon inter-layer exciton formation is shown to be a natural consequence of Coulomb attraction. Quasiparticle spectrum is gapped and incoherent below a critical doping $\delta_c$ due to the formation of excitons. A spin liquid insulator (SLI) phase is thus realized without the lattice frustration. The critical value $\delta_{c}$ sensitively depends on the inter-layer interaction strength. In the $tJ$ model description of each layer with the d-wave pairing, $\delta_{c}$ marks the crossover between SLI and d-wave superconductor. The SLI phase, despite being non-superconducting and charge-gapped, still shows electromagnetic response similar to that of a superfluid due to the exciton transport. Including antiferromagnetic order in the $tJ$ model introduces magnetically ordered phases at low doping and pushes the spin liquid phase to a larger inter-layer interaction strength and higher doping concentrations.
Spin-polarization coupling in multiferroic transition-metal oxides
Chenglong Jia,Shigeki Onoda,Naoto Nagaosa,Jung Hoon Han
Physics , 2007, DOI: 10.1103/PhysRevB.76.144424
Abstract: A systematic microscopic theory of magnetically induced ferroelectricity and lattice modulation is presented for all electron configurations of Mott-insulating transition-metal oxides. Various mechanisms of polarization are identified in terms of a strong-coupling perturbation theory. Especially, the spin-orbit interaction acting on the ligand p orbitals is shown to give the ferroelectric polarization of the spin-current form, which plays a crucial role particularly in eg systems. Semiquantitative agreements with the multiferroic TbMnO3 are obtained. Predictions for X-ray and neutron scattering experiments are proposed to clarify the microscopic mechanism of the spin-polarization coupling in different materials.
Bond electronic polarization induced by spin
Chenglong Jia,Shigeki Onoda,Naoto Nagaosa,Jung Hoon Han
Physics , 2006, DOI: 10.1103/PhysRevB.74.224444
Abstract: We study theoretically the electric polarization induced by noncollinear spin configurations in the limit of strong Hund coupling. We employ a model of two magnetic ions sandwitching an oxygen ion. It is shown that there appears a longitudinal polarization P_x along the bond, which is roughly proportional to (m_r^x)^2-(m_l^x)^2 where m_{r(l)}^x is the x-component of the spin orientation vector at right (left) magnetic ion. A numerical study of the model Hamiltonian yields both longitudinal and transverse electric dipole moments. The transverse polarization is shown to have a non-uniform as well as a uniform component, with the latter being consistent with the previous theory. The longitudinal polarization is non-uniform and oscillating with the period half that of the spin order, but the local magnitude is typically much larger than the uniform transverse polarization and may be detected by X-ray/neutron scattering experiments.
A numerical and experimental study of a dual-function solar collector integrated with building in passive space heating mode
Jie Ji,ChengLong Luo,Wei Sun,Wei He,Gang Pei,ChongWei Han
Chinese Science Bulletin , 2010, DOI: 10.1007/s11434-010-3117-4
Abstract: A newly designed solar collector named dual-function solar collector is proposed. The dual-function solar collector integrated with building can perform in two different modes: working as a passive space heating collector in cold sunny days such as in winter, or working as a facade water heating collector in hot days such as in summer. An experimental study has been carried out to investigate the performance of the novel system in space heating mode, whilst, the dynamic numerical model has been established and validated. The experimental and numerical results show that during the period of the measurement from 9:00 to 17:00, the mean indoor temperature was up to 24.7°C while the mean ambient temperature was only 4.8°C, and a temperature stratification was present in the room. Moreover, a numerical study on the effect of optical property of coatings has been carried out.
Construction and Immunogenicity of a Recombinant Pseudorabies Virus Expressing the Rabies Virus Glycoprotein and EGFP
Naijun Han,Yewei Li,Chenglong Sun,Qingguo Meng,Feifei Song,Yang Yang,Shoufeng Zhang,Rongliang Hu
Journal of Animal and Veterinary Advances , 2012, DOI: 10.3923/javaa.2012.566.571
Abstract: The rabies virus glycoprotein is an efficient vaccine antigen particularly for the oral vaccine of wildlife. Pseudorabies virus contains many non-essential genes and was usually used to construct recombinant vaccines as a viral vector to deliver foreign genes into the target animals. In this study, a recombinant pseudorabies virus rPRV/SRV9G/EGFP, expressing EGFP and rabies virus (SRV9 strain) glycoprotein was constructed by homologous recombination in the UL21 gene. The immunogenicity was evaluated as a vaccine in mice. In this trial, thirty mice were administered with the recombinant vaccine orally. This recombinant virus was demonstrated to be safe for mice by oral administration and could induce neutralizing antibody level above 0.5 IU mL-1 at 3 weeks after the vaccination. The results suggest that rPRV/SRV9G/EGFP was an effective oral vaccine candidate against rabies and UL21 gene could be a target insertion area for foreign genes.
The impact of infliximab treatment on quality of life in patients with inflammatory rheumatic diseases
Chenglong Han, Josef S Smolen, Arthur Kavanaugh, Désirée van der Heijde, Jürgen Braun, René Westhovens, Ning Zhao, Mahboob U Rahman, Daniel Baker, Mohan Bala
Arthritis Research & Therapy , 2007, DOI: 10.1186/ar2306
Abstract: Rheumatoid arthritis (RA), psoriatic arthritis (PsA) and ankylosing spondylitis (AS) are common inflammatory rheumatic diseases with severe consequences for patients' health-related quality of life (HRQoL). RA is the most common of the three, and is characterized by chronic, symmetric, and erosive synovitis of peripheral joints. RA is two to three times more prevalent in women than men and has a peak onset between the ages of 40 and 50 years. Compared with RA, PsA also has articular manifestations, but the joint patterns can be different, including the number of affected joints and the type of arthritis [1]. PsA typically includes psoriatic skin lesions and has a similar prevalence in men and women. Patients with PsA are also usually affected at a younger age than those with RA. Both RA and PsA can lead to impaired function and reduced mobility. AS predominantly affects the axial skeleton and sacroiliac joints (sacroiliitis), which typically leads to decreased spinal mobility. However, AS may also include extraspinal manifestations, such as peripheral arthritis and uveitis, and it is often associated with inflammatory bowel disease and psoriasis. In contrast to RA, AS is three times more prevalent in men than women, and symptoms usually begin in adolescence.Daily pain, stiffness, fatigue, and physical disability are common features of all three rheumatic diseases. Persistent active disease without effective treatment may lead to permanent loss of physical function, reduced productivity, and increased rates of work disability about 10 years after disease onset [2]. Impairments in physical functioning and disability, and the strategies patients use to cope with them, can significantly affect HRQoL. Traditionally, RA is considered to be the most severe of the three diseases, exerting the greatest impact on physical aspects of HRQoL. However, the cohorts of previous studies that compared the HRQoL of patients with RA to that of patients with PsA or AS consisted primaril
Ideals of BCI-algebras and their Properties
Chenglong Wu, Yuzhong Ding
Formalized Mathematics , 2008, DOI: 10.2478/v10037-008-0016-0
Abstract: In this article three classes of ideals are discussed: associative ideals, commutative ideals, implicative ideals and positive implicative ideals, and their elementary properties. Some of their properties and the relationships between them have not been proven yet, and will be completed in the following article. MML identifier: BCIIDEAL, version: 7.8.10 4.99.1005
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