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Jiang J.-J.,Sanjiang College | Yang C.-H.,Nanjing University of Information Science and Technology | Liu Y.-J.,Yangzhou University
Wuli Xuebao/Acta Physica Sinica | Year: 2012

By using the method of exact diagonalization, the properties of the spin-1/2 ferromagnetic-antiferromagnetic alternating Heisenberg chain are investigated. The spin-spin correlation, the sublattice magnetizations, the spin excitation spectrum and the magnetization curve of the model are calculated and compared with the corresponding properties of the mixed spin chain. The results show that the behaviors of the alternating Heisenberg chain are equivalent to those of the mixed spin chain when the ratio of antiferromagnetic to ferromagnetic coupling strength α is very small. So, the properties of the mixed spin chain can be analyzed by using the spin-1/2 ferromagnetic-antiferromagnetic-antiferromagnetic alternating Heisenberg chain. © 2012 Chinese Physical Society.


Jiang J.J.,Sanjiang College | Liu Y.J.,Yangzhou University | Tang F.,Yangzhou Polytechnic Institute | Yang C.H.,Nanjing University of Information Science and Technology
European Physical Journal B | Year: 2011

By using the method of density-matrix renormalization group, the reduced fidelity and entanglement in the one-dimensional bond-alternating S = 1 Heisenberg chain are investigated. The results demonstrate that the quantum phase transition from the Haldane phase to the dimer phase can be characterized by the reduced fidelity and the first derivation of the entanglement entropy. Through the finite-size scaling, the critical point and the critical exponent of the correlation length are obtained accurately. © 2011 EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg.


Qu L.,Sanjiang College | He D.,Nanjing Southeast University
Advanced Materials Research | Year: 2012

This article describes the vehicle based on virtual instrument engine control system research and development of the experimental platform. Virtual instrument technology combined with artificial intelligence inference mechanism for the establishment of a virtual instrument based on the engine electronic control system testing and fault diagnosis system, to achieve the electronic control engine system sensors online test, waveform analysis, data storage, replay and failure diagnosis. © (2012) Trans Tech Publications, Switzerland.


Jiang J.-J.,Sanjiang College | Liu Y.-J.,Yangzhou University | Tang F.,Yangzhou Polytechnic Institute | Yang C.-H.,Nanjing University of Information Science and Technology
Physica B: Condensed Matter | Year: 2012

By using the method of exact diagonalization, we investigated the properties of the distorted mixed spin (1, 1/2) diamond chain with antiferromagnetic interactions along the rung and leg. The ground states of this model contain the sawtooth chain state and the rung dimer plus Haldane state. The research on the origin of the spin gap of the model discloses that there are three different types of spin excitations at different parameter regimes due to the competition among the interactions J 1, J 2 and J 3. © 2012 Elsevier B.V. All rights reserved.


Jiang J.-J.,Sanjiang College | Liu Y.-J.,Yangzhou University | Tang F.,Yangzhou Polytechnic Institute | Yang C.-H.,Nanjing University of Information Science and Technology
Physica B: Condensed Matter | Year: 2011

We investigated the properties of the spin-1/2 ferromagneticantiferromagneticantiferromagnetic alternating Heisenberg chain using the spin-wave theory. The spin-wave excitation spectra, the sublattice magnetizations and the local bond energies of the model are calculated to be compared with the corresponding properties of the mixed spin (1, 1/2) chain for a range of α. The results demonstrate that all the properties show similar behaviours in the small α limit, so the properties of the mixed spin (1, 1/2) chain can be described using the spin-1/2 ferromagneticantiferromagneticantiferromagnetic alternating Heisenberg chain. © 2010 Elsevier B.V. All rights reserved.

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