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.
Sun J.,Sichuan University of Arts and Science |
Mei H.,Chongqing University
Chemical Biology and Drug Design | Year: 2012
Docking studies of pyrrolidine derivatives indicated that Trp178, Arg371, and Tyr406 were the key residues in the active pocket of influenza neuraminidase (NA). Hydrogen bond and electrostatic factors mainly influenced interactions between pyrrolidine derivatives and NA. Moreover, there was a significant correlation between binding affinity (total scores) and the experimental pIC 50. Meanwhile, 3D-QSAR models of 87 pyrrolidine derivatives were developed to understand chemical-biological interactions governing their activities toward NA. Furthermore, R 2, Q 2, , and of the models were from 0.731 to 0.830, from 0.560 to 0.611, from 0.762 to 0.875, and from 0.649 to 0.856, respectively. QSAR modeling results elucidated that hydrogen bonds and electrostatic factors highly contributed to inhibitory activity, which was unanimous in the docking results. © 2012 John Wiley & Sons A/S.
Deng X.,Sichuan University of Arts and Science |
Wu D.,Sichuan University of Arts and Science
RSC Advances | Year: 2014
Highly sensitive photoluminescence detection for 2,4,6-trinitrophenol is developed for the first time based on an energy transfer strategy using photoluminescent carbon nanodots prepared using yam. The photoluminescence method is fast and low cost, has high selectivity towards other nitroaromatic compounds and can achieve TNP detection down to 22 nM within 1 min. © the Partner Organisations 2014.
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.
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).
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.
Gui Y.,Sichuan University of Arts and Science
Proceedings - 2012 International Conference on Computer Distributed Control and Intelligent Environmental Monitoring, CDCIEM 2012 | Year: 2012
1-wire single Bus is different from standard serial data communication Bus, such as SPI, I2C as well as Microwire Bus. 1-wire device use one signal line as two-way transmission, i.e., transmitting data bit and timing synchronization clock. In addition, it needs no additional power supply, and obtained directly sufficient current from one Bus (i.e., parasitic power supply). It has the advantages of little I/O port resources, simple structure, low cost, easy Bus expansion and maintenance and many other merits. In response to these characteristics and advantages, this paper describes in detail the internal principle of 1-Wire device and search algorithm. The utilization of search algorithm is illustrated for example of DS2432. © 2012 IEEE.
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.
Zeng X.-X.,Beijing Normal University |
Zeng X.-X.,Sichuan University of Arts and Science |
Liu W.-B.,Beijing Normal University
European Physical Journal C | Year: 2012
With the help of the Bohr-Sommerfeld quantization rule, the area spectrum of a charged, spherically symmetric spacetime is obtained by studying an adiabatic invariant action variable. The period of the Einstein-Maxwell system, which is related to the surface gravity of a given spacetime, is determined by Kruskal-like coordinates. It is shown that the area spectrum of the Reissner-Nordström black hole is evenly spaced and the spacing is the same as that of a Schwarzschild black hole, which indicates that the area spectrum of a black hole is independent of its parameters. In contrast to quasi-normal mode analysis, we do not impose the small charge limit, as the general area gap 8π is obtained. © 2012 Springer-Verlag / Società Italiana di Fisica.
Fu H.,Sichuan University of Arts and Science
Applied Mechanics and Materials | Year: 2013
Beijing Olympic Games promotes the rapid development of our community sports, and community sports provide plenty forms of physical exercise activities for the masses. The community sports provide a broader stage for China's sports undertakings while enriching people's amateur lives. Currently, the community sports stations are lack of professional sports instructors and the publicity of use-method of the sports equipments. In order to solve these problems, this paper investigates and analyzes the impacts of community sports stations on excises time and sports activities of 500 elder people in 25 communities in Chengdu. In the analysis, multiple linear regression method is adopted. The results show that the community sports stations extend exercise time and change the sports custom of the elder people and bring the communicating platform of sports. However, it is different for the elder people to choose fitness equipment when lack of professional instructors. Therefore, it is recommended to add professional instructors in order to improve the service efficiency of the sports equipments and promote the sports activities of the elder people. © (2013) Trans Tech Publications, Switzerland.