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Mao G.,China University of Technology | Wu Z.,China University of Technology | He Q.,China University of Technology | He Q.,Wuhan Ordnance Noncommissioned Officers Academy | And 5 more authors.
Applied Surface Science | Year: 2011

We investigated the annealing effect on solution processed small organic molecule organic films, which were annealed with various conditions. It was found that the densities of the spin-coated (SC) films increased and the surface roughness decreased as the annealing temperature rose. We fabricated corresponding organic light emitting diodes (OLEDs) by spin coating on the same annealing conditions. The solution processed OLEDs show the considerable efficiency and stability, which were prior or equivalent to the vacuum-deposited (VD) counterparts. Our research shows that annealing process plays a key role in prolonging the lifetime of solution processed small molecule OLEDs, and the mechanism for the improvement of the device performance upon annealing was also discussed. © 2011 Elsevier B.V. All rights reserved.

Shen R.-F.,Ordnance Engineering College | Zheng H.-Q.,Ordnance Engineering College | Jin H.-W.,Academy of Equipment Command and Technology | Kang H.-Y.,Ordnance Engineering College | Dong Z.-W.,Wuhan Ordnance Noncommissioned Officers Academy
Zhendong Ceshi Yu Zhenduan/Journal of Vibration, Measurement and Diagnosis | Year: 2011

In the load change test, the vibration signals are measured on a two-level gearbox testbed. For coping with non-stationary signals effective, wavelet packet is used for obtaining a feature vector (values of condition attribute). For coping with noise data effective, variable precision rough set (VPRS) theory is introduced in the fault diagnosis of the gear, and a kind method of condition attribute reduction is presented. Firstly, continuous attributes are discretized. Then, the set of M is defined, and varying values of β (right ratio of classification) are selected according to the reality, and the quality of approximation classification of VPRS is utilized to carry through condition attribute reduction and contrasted its result with the reduction result coming from data (including noise data). Finally, a practical example in the gear shows the validity and practicability of the algorithm.

Wang B.,Wuhan Ordnance Noncommissioned Officers Academy | An Y.G.,Beihang University | Zhang M.,Wuhan Ordnance Noncommissioned Officers Academy | Zheng Y.,Wuhan Ordnance Noncommissioned Officers Academy
Applied Mechanics and Materials | Year: 2014

In modern campaign, Aircraft maneuverability and agility have been playing an increasingly important role. Plasma thrust vector control can avoid shortcomings of traditional methods, it has a very good prospect. In present work a CFD simulation of a thrust vector control for a 2D nozzle is performed.The results showed that the change of the magnetic field can impress the vector turn of the nozzle flowfield. © (2014) Trans Tech Publications, Switzerland.

Ren P.Y.,Xi'an Jiaotong University | Yuan Q.,Wuhan Ordnance Noncommissioned Officers Academy | Wang R.,Xi'an Jiaotong University | Cai J.,University of Manitoba
Science China Information Sciences | Year: 2011

In this paper, a novel method for constructing quasi-cyclic LDPC codes with low complexity is proposed. By choosing each circulant permutation matrix sequentially, the proposed method ensures that the current circulant permutation matrix forms no cycles of length smaller than g with the existent circulant permutation matrices. The construction complexity of the proposed algorithm is much lower than that of the random construction. Simulation results show that the proposed QC-LDPC codes can outperform both the random regular LDPC codes with short to moderate block lengths, and the proposed construction method LDPC codes based on the finite geometries in terms of bit-error-rate (BER). © Science China Press and Springer-Verlag Berlin Heidelberg 2011.

Wei G.,Shijiazhuang Mechanical Engineering College | Li K.,Shijiazhuang Mechanical Engineering College | Li K.,Wuhan Ordnance Noncommissioned Officers Academy | Pan X.,Shijiazhuang Mechanical Engineering College | And 2 more authors.
Gaodianya Jishu/High Voltage Engineering | Year: 2014

For protecting sensitive circuits in shielded enclosures, we analyzed the enclosures enhancement effect of field intensity using the software CST. Then we verified the simulation results though experiments in a homemade experimental system composed of a vector network analyzer, power amplifiers, a giagahertz transverse electromagnetic chamber, and pulsed electromagnetic field measuring probes, etc. Lastly we theoretically analyzed the mechanism of the field enhancement, and the influences of the aperture shape, the electromagnetic wave's polarization direction, the position in cavity, and the absorbing material loaded on the enhancement. It is shown that the simulation agrees with the experiment results. The field enhancement effect of aperture is affected by the enclosure's surface current, the aperture resonance, and the enclosure resonance. The effect is more remarkable if the aperture is rectangular, compared with square or circular apertures. For different polarization directions of the electric field, the electric field perpendicular to the long side of rectangular aperture results in the strongest enhancement effect. The enhancement effect strengthens with decreasing distance to the aperture when the frequency is below its minimum resonant value. Moreover, adding absorbing materials can fairly weaken the enhancement effect at the center of the enclosure. The results can be a theoretic basis for electromagnetic compatibility designs and protections for shielded enclosures with apertures.

Zhang L.,Wuhan Ordnance Noncommissioned Officers Academy | Yin M.Y.,Wuhan Ordnance Noncommissioned Officers Academy | Li W.,Wuhan Ordnance Noncommissioned Officers Academy | Liu H.L.,Wuhan Ordnance Noncommissioned Officers Academy
Applied Mechanics and Materials | Year: 2014

Aimed at the applications of technology of camera calibration to 3D reconstruction, the ideal camera model is discussed, especially on the influences and solving methods of lens radial distortion andtangential distortion, and an arithmetic of camera calibration based on OpenCV (open source computer vision library) in Visual C++ environment is given. This arithmetic makes use of the functions of the library effectively, so it has high calibration precision and good robust. It can meet the needs of august reality and othercomputer vision systems. © (2014) Trans Tech Publications, Switzerland.

Liu M.,Ordnance Engineering College | Sun Q.,Ordnance Engineering College | Jiang Z.,Wuhan Ordnance Noncommissioned Officers Academy
Zhongguo Jixie Gongcheng/China Mechanical Engineering | Year: 2013

The micro-magnetic fixed knot which did not depend on the outer magnetic field formed near the defects, because the domain wall in the ferro-magnets was pinned by the defects. The singular distribution of magnetizing field in the micro-magnetic fixed knot near the defects was calculated by the method of minimum energy form micro-magnetics analysis. Defect detection can be realized according to the distribution characteristics and what proposed herein provides a theoretical basis for defect micro-magnetic defection.

Yin M.Y.,Wuhan Ordnance Noncommissioned Officers Academy | Guan F.,Wuhan Ordnance Noncommissioned Officers Academy | Ding P.,Wuhan Ordnance Noncommissioned Officers Academy | Liu Z.F.,Wuhan Ordnance Noncommissioned Officers Academy
Applied Mechanics and Materials | Year: 2014

With the aim to solve the implement problem in scale invariant feature transform (SIFT) algorithm, the theory and the implementation process was analyzed in detail. The characteristics of the SIFT method were analyzed by theory, combined with the explanation of the Rob Hess SIFT source codes. The effect of the SIFT method was validated by matching two different real images. The matching result shows that the features extracted by SIFT method have excellent adaptive and accurate characteristics to image scale, viewpoint change, which are useful for the fields of image recognition, image reconstruction, etc. © (2014) Trans Tech Publications, Switzerland.

Lu Y.,Wuhan Ordnance Noncommissioned Officers Academy | Cheng Y.,Wuhan Ordnance Noncommissioned Officers Academy | Zhu M.,Wuhan Ordnance Noncommissioned Officers Academy | Zheng Q.,Huazhong University of Science and Technology
Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering | Year: 2012

The depolarization effect is taken with depolarization magnitude and depolarization phase, and it will be ignored as long as depolarization magnitude is very small, meanwhile depolarization phase also can be ignored. The math mode for depolarization magnitude and depolarization phase of this cross resonator when the corner cube reflector CCR was rotated was founded with the method of optic matrix and transition matrix. Then numerical simulation was taken. It indicates that depolarization magnitude can be zero under some conditions of polaration azimuth, when the two CCRs are arranged with enantiomorphous configuration; and depolarization magnitude will be less than 0.09 when the angle is less than 2.5 degree. However, depolarization magnitude will be always large when two CCRs are arranged with centrosymmetric configuration.

Zhang L.,Wuhan Ordnance Noncommissioned Officers Academy | Yang X.D.,Wuhan Naval University of Engineering | Guan F.,Wuhan Ordnance Noncommissioned Officers Academy | Zheng C.,Wuhan Ordnance Noncommissioned Officers Academy
Applied Mechanics and Materials | Year: 2014

A large number of constant power loads (CPLs) are included in the integrated power system (IPS). This paper firstly studied the characteristics of the load, based on which concluded the physical mechanism of static instability and the chief factors of the static stability of IPS. © (2014) Trans Tech Publications, Switzerland.

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