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Chen D.,China West Normal University | Zeng X.,Beijing Normal University | Zeng X.,Sichuan University of Arts and Science
General Relativity and Gravitation | Year: 2013

A d-dimensional Schwarzschild black hole is quantized by the action variable and the Bohr-Sommerfeld quantization rule in this paper. We find that the spectra of the horizon area and the entropy are evenly spaced. The black hole mass is also quantized and it's spectrum spacing is proportional inversely to the mass. The ground state appears and has a constant entropy πkB. The ground state mass is shown to be the black hole remnant predicted by the generalized uncertainty principle and may be a candidate of dark matter. © 2012 Springer Science+Business Media New York. Source


Zhou Z.,Southwest University | Guo C.,Sichuan University of Arts and Science
Automatica | Year: 2013

In this paper, the stabilization of a linear heat equation with a heat source at intermediate point is discussed applying the backstepping method. Firstly, we prove the existence of kernels in the forward and inverse transformation by some special techniques; secondly, we obtain the exponential stability with any prescribed decay rate of a closed-loop system; finally, the effectiveness of the explicit feedback stabilization controller design is illustrated with some numerical examples. © 2012 Elsevier Ltd. All rights reserved. Source


Chen X.,Sichuan University of Arts and Science
Modern Physics Letters B | Year: 2014

Gradient Si-rich carbide (GSRC) thin films were deposited on monocrystalline silicon wafers and quartz substrates by magnetron co-sputtering, with subsequent thermal annealing by rapid thermal processing. Fourier transform infrared spectroscopy, Raman spectroscopy, grazing incident X-ray diffraction, transmission electron microscope, and Hall measurements were used to analyze the microstructure and conductivity of the films. It was observed that bonding configurations, microstructure and conductivity properties changes with the annealing temperature from 700°C to 1000°C. The experimental results demonstrate that Si QDs with crystal volume fraction of 72.5%, average size of 4.5 nm, and number density of ~ 2×1012 cm-2 embedded in the amorphous SiC matrix can be formed using a GSRC multilayer structure, with subsequent annealing at 1000°C. The 1000°C annealed thin film possesses a conductivity of ~5 S· cm-1, which can be attributed to high carrier transport efficiency caused by high Si QD density. © World Scientific Publishing Company. Source


Wei S.,Hubei University for Nationalities | Xiang W.,Sichuan University of Arts and Science
Journal of Food, Agriculture and Environment | Year: 2012

Kaolinite (K), ferrihydrite (F) and kaolinite-ferrihydrite association (KF) were characterized using X-ray diffraction, potentiometric titrations and surface and pore structures analysis. Moreover, the adsorption characteristics for fluoride by the three samples were studied. Compared to the average values of the K and F samples, the BET surface area, external surface area, total pore volume and surface fractal dimension of the KF increased; however, the hydroxyl density and proton charge of the KF decreased. The pH of point of zero net proton charge (pHpznpc) of the K, F and KF appeared at pH 3.6-4.3, 8.0 and 6.2-7.2, respectively. The adsorption capacities (q e) for fluoride by the three samples followed the order of F>KF>K, and the maximum adsorption capacity (q max) of the KF was much higher than the average value of the K and F samples. The adsorption data for fluoride by the three samples could be well fitted by one-site Langmuir and two-site Langmuir models (R 2 = 0.981-0.992), but the Freundlich model can only describe the adsorption for fluoride by the KF sample (R 2 = 0.975). Source


Zeng X.-X.,Sichuan University of Arts and Science
Wuli Xuebao/Acta Physica Sinica | Year: 2010

Based on the work of Majhi et al., we investigate the entropy correction to the Kerr-Newman black hole beyond semiclassical approximation by the Dirac equation. Because in the units G=c=kB=1, the Planck constant is proportional to the square of Planck Length, Planck Mass and Planck Charge, the proportionality parameter of quantum correction terms to the semiclassical term of action is taken as (Mrh-Q2/2)-1. With the aid of the differential form of horizon equation and the first law of black hole thermodynamics, we obtain the corrected entropy of charged stationary black hole and find that the correction terms also include the logarithmic and inverse terms to Bekenstein-Hawking entropy. © Chin.Phys.Soc. Source

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