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Xinyang, China

Liu L.-C.,Xinyang Normal University | Yang X.,Shanghai University
Yantu Lixue/Rock and Soil Mechanics

As we know, the soil has viscoelastic characteristic, the control equations of saturated soil described by fractional derivative model are established based on the theories of porous media and theories of fractional derivatives, in which the soil is regarded as porous medium filled with water; and the stress-strain relationship is described by fractional derivative viscoelastic model for considering the viscoelastic properties of soil skeleton. The vertical coupled vibration of a pile in a saturated soil described by fractional derivative model is investigated by introducing the potential functions and separation of variables method under the three-dimensional axisymmetric condition; and the influences of the model parameters on the vertical vibration of a pile in saturated soil is analyzed. The results indicate that the control equations of the saturated soil described by fractional derivative model has a wider application; and the model parameters has great influences on the vertical vibration of a pile in saturated soil. Source

Yang M.-H.,Xinyang Normal University | Han Z.-Q.,Dalian University of Technology
Nonlinear Analysis: Real World Applications

In this paper, we study the existence and multiplicity results for the nonlinear SchrödingerPoisson systems -Δu+V(x)u+K(x)φ(x)u=f(x,u), in R 3,-Δφ=K(x) u2,in R 3. Under certain assumptions on V, K and f, we obtain at least one nontrivial solution for (*) without assuming the Ambrosetti and Rabinowitz condition by using the mountain pass theorem, and obtain infinitely many high energy solutions when f(x,·) is odd by using the fountain theorem. © 2011 Elsevier Ltd. All rights reserved. Source

Gao Y.,Xinyang Normal University
European Physical Journal D

We investigate the effects of the initial correlation on the dynamics of open system in the exactly solvable pure dephasing model. We show that the role of the initial correlation come into play through a phase function and a weight factor, which would perform oscillations during time evolution, and find that the decoherence of a qubit coupled to a boson bath is more enhanced with respect to a spin bath in the short time. We also demonstrate that the trace distance between two states of a qubit can increase above its initial value, and that the initial correlation can provide another resource for the damply oscillation and revival of the entanglement of two qubits. We finally investigate the dependence of the crossover of decoherence from the dynamical enhancement to suppression under the bang-bang pulse control on the initial correlation and the statistics of the bath constituents. © 2013 EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg. Source

Lu J.,Liaoning Normal University | Xu L.,Korea Astronomy and Space Science Institute | Xu L.,Dalian University of Technology | Liu M.,Xinyang Normal University
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

Kinematical models are constrained by the latest observational data from geometry-distance measurements, which include 557 type Ia supernovae (SNIa) Union2 data and 15 observational Hubble data. Considering two parameterized deceleration parameter, the values of current deceleration parameter q0, jerk parameter j0 and transition redshift zT, are obtained. Furthermore, we show the departures for two parameterized kinematical models from ΛCDM model according to the evolutions of jerk parameter j(z). Also, it is shown that the constraint on jerk parameter j(z) is weak by the current geometrical observed data. © 2011 Elsevier B.V. Source

Kou H.,Wuhan Polytechnic University | Yang S.,Xinyang Normal University
Journal of Physical Chemistry C

Band energetics of nanostructured Zn 2SnO 4 electrodes were determined with spectroelectrochemical measurements, and its trap states were investigated with electrochemistry. The flat band edges (E fb) of nanostructured Zn 2SnO 4 electrodes were highly dependent on pH of electrolyte and measured to be -0.60, -0.73, -0.85, -0.94, and -1.08 V vs saturated Ag/AgCl in 0.5 mol L -1 LiClO 4 of pH 3.0, 5.0, 6.9, 10.0, and 13.0, respectively, and followed the Nestain relationship of E fb = -0.49 - 0.046pH, V vs Ag/AgCl. The addition of acetate also changed the E fb. The E fb were measured to be -0.48, -0.54, -0.71, -0.86, and -1.03 V in 0.5 mol L -1 LiClO 4 and 1.0 mol L -1 NaAc of pH 4.0, 5.0, 7.0, 10.0, and 13.2, respectively, and followed a Nestian relationship of E fb= -0.25 - 0.060pH, V vs Ag/AgCl, very close to that reported by Wu and Alpuche-Aviles [J. Am. Chem. Soc.2009, 131, 3216]. The time-resolved currents at different applied potentials positive of flat band edge clearly indicate a trap-filling process. Trap state densities are also highly pH dependent. Total trap state densities of 2.79 × 10 15, 6.75 × 10 15, and 9.98 × 10 15 cm -2 were determined in 0.5 mol L -1 LiClO 4 solutions of pH 3.0, 6.9, and 13.0, respectively, with maximum located at -0.25 V, -0.30 V, and -0.60 V. The trap state densities of 4.17 × 10 15, 6.88 × 10 15, and 7.17 × 10 15 cm -2 were calculated in 0.5 mol L -1 LiClO 4 and 1.0 mol L -1 NaAc solutions of pH 4.0, 7.0, and 13.2, respectively. The results obtained from CVs are in good agreement with that obtained from the measurements of time-resolved currents, and the size of the peak potentials related to the trap states increases dramatically with an increase of pH, indicating that traps are mostly surface-related. © 2012 American Chemical Society. Source

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