Civil Aviation University of China
Tianjin, China

Civil Aviation University of China is a national university in Tianjin, China under the Civil Aviation Administration of China. The university was established in 1951 to provide civil aviation tertiary education and training for new pilots in China. With special focus on the higher education of civil aviation engineering and management, it has been developed as the main institute in these fields. It is next to the Tianjin Binhai International Airport. CAUC consists of two campus, the northern and the southern campuses, with a total area 1.03 million m2. Wikipedia.

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Han Z.,Civil Aviation University of China
Journal of Magnetism and Magnetic Materials | Year: 2017

The magnetic properties, electrical transport properties, and low temperature specific heat of polycrystalline perovskite manganese oxide Pr0.65Ca0.35MnO3 have been investigated experimentally. It is found that there exists cluster glass state in the sample at low temperature besides the antiferromagnetic insulating state. With the increase of magnetic field, antiferromagnetic insulating state converts to ferromagnetic metal state and the Debye temperature decreases gradually. In addition, the low temperature electron specific heat in zero magnetic field is obviously larger than that of ordinary rare-earth manganites oxide and this phenomenon is related to the itinerant electrons in ferromagnetic cluster state and the disorder in Pr0.65Ca0.35MnO3. © 2016

xu D.,Civil Aviation University of China
Quantum Information Processing | Year: 2017

We construct mutually unbiased maximally entangled bases (MUMEBs) in bipartite system Cd⊗ Cd(d≥ 3) with d a power of a prime number. Precisely, by means of permutation matrices and Hadamard matrices, we construct 2 (d- 1) MUMEBs in Cd⊗ Cd. It follows that M(d, d) ≥ 2 (d- 1) , which is twice the number given in Liu et al. (2016), where M(d, d) denotes the maximal size of all sets of MUMEBs in Cd⊗ Cd. In addition, let q be another power of a prime number, we construct MUMEBs in Cd⊗ Cq d from those in Cd⊗ Cd by the use of the tensor product of unitary matrices. © 2017, Springer Science+Business Media New York.

Guo J.,Civil Aviation University of China
Journal of Chemical and Pharmaceutical Research | Year: 2014

Adopt multilevel fuzzy comprehensive evaluation method to carry out quantitative evaluation on university English teaching quality, and put forward evaluation grades. Through university undergraduate course talent training objectives, teachers development guiding thought, combining practical teaching situation, design a complete set of evaluation indicator system, and according to levels classification to make quantization on factors that reflect university English teaching quality, get a series of each level weight matrix. Through questionnaire survey on students, finally get fuzzy judgment matrix, calculate numeric fuzzy relation matrix, by multilevel compound operation, and finally define evaluation objects subordinate grades. The model relative integrally scientific evaluates university English teaching quality.

Hu X.L.,Civil Aviation University of China
Journal of physics. Condensed matter : an Institute of Physics journal | Year: 2011

We have investigated effects of O on mechanical properties of NiAl by calculating the cleavage energy (γ(C)) and the unstable stacking fault energy (γ(us)) using a first-principles method. O is shown to reduce γ(C)/γ(us) for the [001](110) and [100](001) slip systems, indicating that the presence of O should be associated with the ductility reduction of NiAl. Further, γ(C)/γ(us) of the NiAl-O system can be increased by Cr, suggesting the possibility to suppress the negative effect of O via alloying elements.

Ma Y.,Civil Aviation University of China
Optical Review | Year: 2012

We present an experimental setup to generate radially polarized beams without using high-cost optical elements. In the setup a four-segment polarization converter is used in front of the fiber to produce a pseudo radially polarized beam. A traditional step-index fiber which supports only LP 01 and LP 11 modes is then used as a mode-cleaning device. A commercial mechanical fiber-squeezer polarization controller is applied to produce adequate pressure and twist onto the fiber. The four-segment polarization converter and the fiber squeezer polarization controller are adjusted by turns for improving the beam quality in intensity and polarization. Additionally, several methods of characterizing the polarization properties of radially polarized beams are reviewed. One of the latest methods is applied for characterizing the polarization properties of the radially polarized beams produced by using our technique. The results show the highquality of the obtained beams. © 2012 The Optical Society of Japan.

Chen W.,Civil Aviation University of China
Journal of Applied Geodesy | Year: 2016

GNSS-based attitude determination technique is an important field of study, in which two schemes can be used to construct the actual system: the common clock scheme and the non-common clock scheme. Compared with the non-common clock scheme, the common clock scheme can strongly improve both the reliability and the accuracy. However, in order to gain these advantages, specific care must be taken in the implementation. The cares are thus discussed, based on the generating technique of carrier phase measurement in GNSS receivers. A qualitative assessment of potential phase bias contributes is also carried out. Possible technical difficulties are pointed out for the development of single-board multi-antenna GNSS attitude systems with a common clock. © Walter de Gruyter GmbH, Berlin/Munich/Boston 2016.

Yang J.,Civil Aviation University of China | Shi Y.,Civil Aviation University of China
Pattern Recognition Letters | Year: 2012

Finger-vein based biometrics, as a new approach to personal identification, has received much attention in recent years. However, the poor visibility of finger-vein imageries is really not beneficial for deepening the understanding of finger-vein characteristics. Moreover, unreliable finger-vein region of interest (ROI) localization can also heavily degrade the performance of a finger-vein based recognition system in practical scenario. Hence, in this paper, we first introduces a new and robust approach for finger-vein ROI localization, and then proposes a new scheme for effectively improving the visibility of finger-vein imageries. Extensive experiments are finally conducted to validate the proposed method. © 2012 Elsevier B.V. All rights reserved.

Tan X.,Civil Aviation University of China
Advances in Information Sciences and Service Sciences | Year: 2012

In this work, we are interested in the air-ground control to resolve the aircraft landings Problem. This problem consists at obtaining the sequencing order of aircrafts and the scheduling of landing times. The objective to solve the problem of aircraft landings is to minimize the total delay costs. In this work, we have presented a new formulation for the static aircraft arrival sequencing and scheduling, as a quadratic model. A transformation of it into linear integer program was presented by proposing a change of variables to linearize the nonlinear constraints. In the second part of this paper an ant colony algorithm have been proposed. The numerical results show that our approach is effective. For this reason we are now preparing an exact method to compare the results of this method with that of meta-heuristic.

Yang J.,Civil Aviation University of China | Zhang X.,Civil Aviation University of China
Pattern Recognition Letters | Year: 2012

Multimodal biometrics based on feature-level fusion is a significant topic in personal identification research community. In this paper, a new fingerprint-vein based biometric method is proposed for making a finger more universal in biometrics. The fingerprint and finger-vein features are first exploited and extracted using a unified Gabor filter framework. Then, a novel supervised local-preserving canonical correlation analysis method (SLPCCAM) is proposed to generate fingerprint-vein feature vectors (FPVFVs) in feature-level fusion. Based on FPVFVs, the nearest neighborhood classifier is employed for personal identification finally. Experimental results show that the proposed approach has a high capability in fingerprint-vein based personal recognition as well as multimodal feature-level fusion. © 2011 Elsevier B.V. All rights reserved.

Yang J.,Civil Aviation University of China | Shi Y.,Civil Aviation University of China
Information Sciences | Year: 2014

Biometric recognition based on human finger-vein patterns is an emerging technique and has been receiving increasing attention. Due to light attenuation in biological tissue, the collected finger-vein images are often seriously degraded. This makes finger-vein feature representation unreliable, and inevitably impairs the accuracy of finger-vein recognition. Exploring suitable ways of finger-vein image restoration and enhancement is indispensable for finger-vein based personal identification. In this paper, we first analyze the intrinsic factors causing the degradation of finger-vein images, and propose a simple but effective scattering removal method to improve the visibility of finger-vein images. Moreover, to handle venous region enhancement problem effectively, a directional filtering method based on a family of Gabor filters is proposed. Finally, a Phase-Only-Correlation strategy is used to measure the similarity of the enhanced finger-vein images. Experiments performed on a large finger-vein image database show that the proposed method is effective and reliable in finger-vein image restoration and enhancement. © 2013 Elsevier Inc. All rights reserved.

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