Chengdu University of Information Technology is a Chinese university founded in 1951. It is a key developing provincial university joint building by China Meteorological Administration and Sichuan Province. It is the only university independently specializing in information technology in southwest China, and is the member of CDIO world organization. From 2004, It started to educate reserve army officers for strategic missile forces which named Second Artillery Corps in People's Liberation Army of the People's Republic of China . Wikipedia.
Zhou L.,Chengdu University of Information Technology |
Wu W.-Z.,Zhejiang Ocean University
Computers and Mathematics with Applications | Year: 2011
The primitive notions in rough set theory are lower and upper approximation operators defined by a fixed binary relation and satisfying many interesting properties. Many types of generalized rough set models have been proposed in the literature. This paper discusses the rough approximations of Atanassov intuitionistic fuzzy sets in crisp and fuzzy approximation spaces in which both constructive and axiomatic approaches are used. In the constructive approach, concepts of rough intuitionistic fuzzy sets and intuitionistic fuzzy rough sets are defined, properties of rough intuitionistic fuzzy approximation operators and intuitionistic fuzzy rough approximation operators are examined. Different classes of rough intuitionistic fuzzy set algebras and intuitionistic fuzzy rough set algebras are obtained from different types of fuzzy relations. In the axiomatic approach, an operator-oriented characterization of rough sets is proposed, that is, rough intuitionistic fuzzy approximation operators and intuitionistic fuzzy rough approximation operators are defined by axioms. Different axiom sets of upper and lower intuitionistic fuzzy set-theoretic operators guarantee the existence of different types of crisp/fuzzy relations which produce the same operators. © 2011 Elsevier Ltd. All rights reserved.
Dou L.,Sichuan Normal University |
Ji X.,Sichuan Normal University |
Li P.,Chengdu University of Information Technology
Optics Express | Year: 2012
The model of partially coherent annular beams with linear nonuniformity field profile in the x direction is set up. The analytic expressions for the average intensity and the centre of gravity of partially coherent annular beams with decentered field propagating through atmospheric turbulence along a slant path are derived. The propagation equation governing the position of the intensity maximum is also given. It is found that the beam non-uniformity is amended gradually as the propagation distance and the strength of turbulence increase. The centre of beam gravity is independent of both the propagation distance and the turbulence. However, the position of the intensity maximum changes versus the propagation distance and the turbulence, and is farthest away from the propagation z-axis at a certain propagation distance. When the propagation distance is large enough, the position of the intensity maximum reaches an asymptotic value which increases with decreasing the zenith angle and is largest for the free space case. When the propagation distance is large enough, the position of the intensity maximum is not on the propagation zaxis, and is nearer to the propagation z-axis than the centre of beam gravity. On the other hand, changes in the intensity maximum in the far field are also examined in this paper. © 2012 Optical Society of America.
Ling W.,Chengdu University of Information Technology
IEEE Transactions on Magnetics | Year: 2014
The NiCuZn ferrite (Ni0.60Cu0.24Zn 0.16Fe2O4) has been prepared by a conventional solid-reaction method and sintered at 900°C with different dopants to adapt to the low temperature cofired ceramic (LTCC) technology. Two kinds of dopants, oxide Bi2O3 (BI) and ferroelectric ceramic Bi 4Ti3O12 (BIT), are used in different amounts or combinations (2wt%BI, 2wt%BIT, 2wt%BI + 2wt%BIT, 4wt%BI, and 4wt%BIT) to promote the sintering process. Variation of microstructure and density in each sample has been analyzed. Influence of the doping mode on the magnetic properties of the ferrite has been investigated. It can be found that the ferrite doped with BI has an obvious decrease of both MS and H C in contrast with the ferrite doped with same amount of BIT. Appropriate amounts of BIT is helpful to not only increase MS, but also decrease of HC, compared with the ferrite without doping. © 2013 IEEE.
Junxiu A.,Chengdu University of Information Technology
Journal of Software | Year: 2011
With the rapid growth of networks digital information on the internet, the development and application of information retrieval technology is becoming inevitable. Based on the study of search engine and mobile search engine, according to the development of current technology, we experts put forward the cloud retrieval system model. The model consists of the cloud information layer, cloud retrieval cluster system, the user query box. The cloud retrieval cluster system consists of the cloud collecting layer, the cloud processing layer, the cloud index layer, the query layer of clouds, the cloud interface layer, data storage stratus layer, the cloud retrieval monitoring system, the clouds management system and scheduling system. In this paper, it is researched the function that the core level should complete and the core technology detailedly, and it has accomplished this model. The results of testing the model is shown that the system function can realize correctly, its performance is good and steady. The demonstration of this model gives the retrieval technology of massive information a scheme to develop thinking. © 2011 ACADEMY PUBLISHER.
Tang T.,Chengdu University of Information Technology
IEEE Photonics Technology Letters | Year: 2012
A flat-top filter with adjustable, broad, and robust tunneling band is proposed, where the barrier is composed of multiple layers including a medium with adjustable permeability (MAP) and metamaterial. Using a frustrated total internal reflection structure composed of glass-MAP-metamaterial-MAP-glass, the flat-top tunneling band can be realized and shifted to other frequency bands by adjusting the permeability of MAP to satisfy permeability and incident angle match conditions. In addition, our filter has a more robust flat-top tunneling band compared with other flat-top filters when the thickness of every layer changes. At last, the effect of metamaterial loss is considered. © 2006 IEEE.
Guo J.,Chengdu University of Information Technology |
Yu J.,Chengdu University of Information Technology
Applied Microbiology and Biotechnology | Year: 2014
This paper focuses on the effectiveness of removing Pb(II) from aqueous solution using bioflocculant MBFR10543 and a series of experimental parameters including MBFR10543 dose, calcium ions concentration, solution pH, and temperature on Pb(II) uptake was evaluated. Meanwhile, the flocculation mechanism of MBFR10543 was discussed. Results have demonstrated that the removal efficiency of Pb(II) reached 94.7 % (with the sorption capacity of 81.2 mg·g-1) by adding MBFR10543 in two stages, separately, 3×10-2 % (w/w) in the 1.0 min's rapid mixing (180 rpm) and 4×10-2 % (w/w) after 2.0 min's slow mixing (80 rpm) with pH value fixed at 6. Pb(II) flocculation process could be described by the Langmuir isotherms model and pseudo-second-order kinetic model. The negative Gibbs free energy change indicated the spontaneous nature of the flocculation. Fourier transform infrared spectra analysis indicated that functional groups, such as -OH, C=O, and C-N, were existed in MBFR10543 molecular chains, which had strong capacity for removing Pb(II). Furthermore, both charge neutralization and bridging being the main mechanisms involved in Pb(II) removal by MBFR10543. © 2014 Springer-Verlag.
Guo J.,Chengdu University of Information Technology
Applied Microbiology and Biotechnology | Year: 2014
This paper investigated the characteristics of Cu(II) sorption from aqueous solution by using bioflocculant MBFR10543 and discussed the mechanism during the sorption process. Results have demonstrated that the removal efficiency of Cu(II) reached 96.9 % by adding MBFR10543 in two stages, separately, 1.5 × 10−2 % (w/w) in the 1.0-min rapid mixing (180 rpm) and 2.0 × 10−2 % (w/w) after 2.0-min slow mixing (80 rpm), with pH value fixed at 6.0. Cu(II) sorption process could be described by the pseudo-second-order kinetic model and the Langmuir isotherms model. The negative Gibbs free energy change indicated the spontaneous nature of the sorption. Fourier transform infrared spectra analysis indicated that functional groups, such as –OH, −COOH, C═O, and –NH2, were existed in MBFR10543 molecular chains, which had strong capacity for removing Cu(II). Furthermore, both charge neutralization and bridging being the main mechanisms involved in Cu(II) removal by MBFR10543. © 2014, Springer-Verlag Berlin Heidelberg.
Ding Y.,Chengdu University of Information Technology
Physica B: Condensed Matter | Year: 2012
The structural stability, mechanical properties and thermodynamic parameters such as Debye temperature, minimum thermal conductivities of orthorhombic-A 2N 2O (A=C, Si and Ge) are calculated by first principles calculations based on density functional theory. The calculated lattice parameters, elastic constants of Si 2N 2O and Ge 2N 2O using PBEsol function are consisted with the experimental data and other calculated values. The full set elastic constants of the orthorhombic-A 2N 2O (A=C, Si and Ge) are calculated by stress-strain method. The mechanical moduli (bulk modulus, shear modulus and Youngs modulus) are evaluated by the Voigt-Reuss-Hill approach. The orthorhombic-C 2N 2O exhibits larger mechanical moduli than the other two structures. The hardness of orthorhombic-A 2N 2O (A=C, Si and Ge) is evaluated according to the intrinsic hardness calculation theory of covalent crystal relying on Mulliken overlap population. The results indicate that the orthorhombic-C 2N 2O is a super hard material. Furthermore, the mechanical anisotropy, Debye temperature and minimum thermal conductivity of the orthorhombic-A 2N 2O (A=C, Si and Ge) have been estimated by empirical methods. The orthorhombic-Ge 2N 2O shows the lowest thermal conductivity, which may have useful applications as gas turbine engines and diesel engines. © 2012 Elsevier B.V. All rights reserved.
Li X.,Chengdu University of Information Technology
International Journal of Digital Content Technology and its Applications | Year: 2012
In this paper, according to the disadvantage of the tradition method tuning the structure and parameter of neural network (i.e., network growth or network pruning), a new neural network model has been proposed. In new model, the hidden nodes selection layer is inserted between output layer and hidden layer of the traditional feedforward neural network, and the switch, whose state is off, the hidden node is selected, otherwise given up, is set to each link between the hidden layer and hidden nodes selection layer. Using an application example on the sunspot numbers, it is proved that the network using the proposed network model trained with the genetic algorithms to tune, is the best appropriate. By the comparison with tradition BP neural network, it is again proved that the prediction result, using the proposed neural network, is better and more stable than using the tradition BP neural network. So, the proposed method, tuning the structure and parameters of a neural network by using genetic algorithms, is Reasonable and effective.
Ye S.,Chengdu University of Information Technology
Energy Procedia | Year: 2011
A time synchronization system based on the Chinese GPS system i.e. Beidou or Compass for smart grid applications is illustrated. A time synchroni-zation Beidou receiver with self-designed radio frequency IC (RFIC) is presented. The receiver provides precise one pulse per second (1PPS) timing service for the smart grid. © 2011 Published by Elsevier Ltd.