Second Research Institute of Civil Aviation Administration of China

Chengdu, China

Second Research Institute of Civil Aviation Administration of China

Chengdu, China

Time filter

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Fu Z.,University of Electronic Science and Technology of China | Li Y.,University of Electronic Science and Technology of China | Ding L.,University of Electronic Science and Technology of China | Long K.,Second Research Institute of Civil Aviation Administration of China
Journal of Systems Engineering and Electronics | Year: 2016

Super-resolution (SR) techniques, which are based on single or multi-frame low-resolution (LR) images, have been extensively investigated in the last two decades. Mixed-resolution multiview video format plays an important role in three-dimensional television (3DTV) coding scheme. Previous work considers multiview or multi-camera images and videos at the same resolution, which performs well under the planar model without or with little projection error among the videos captured by different cameras. In recent years, several researchers have discussed the SR problem in mixed-resolution multi-view video format, where the superresolved image is created using the up-sampled version of the LR image and the high frequency components extracted from the warped image in the adjacent high-resolution (HR) views. Unfortunately, the output HR images suffer from artifacts caused by depth error. To obtain the detailed texture and edge information from the HR image as much as possible, while preserving the structure of the LR image, a novel SR reconstruction algorithm is proposed. The algorithm is composed of three components: the structure term, the detail information term, and the regularization term. The first term preserves the structure similarity of the LR image; the second term extracts detailed information from the adjacent HR image; and the last term ensures the uniqueness of the solution. Experimental results show the effectiveness and robustness of the proposed algorithm, which achieves high performance both subjectively and objectively. © 2016 Beijing Institute of Aerospace Information.


Luo S.,University of Electronic Science and Technology of China | Hou M.,University of Electronic Science and Technology of China | Zhan S.,University of Electronic Science and Technology of China | Lyu M.,Second Research Institute of Civil Aviation Administration of China | Li M.,University of Electronic Science and Technology of China
Chinese Journal of Electronics | Year: 2017

The problem of consistency maintenance in replication is a fundamental issue in cloud storage. Existing solutions either cannot obtain good efficiency, or suffer low reliability. We propose a novel consistency maintenance strategy based on diamond topology. It organizes all the nodes in cloud storage system into a high symmetrical, reliable structure. The experimental results show that our diamond topology reduces the network overhead by 55.9% at least, compared to state-of-the-art random topology, and achieves at most 49.1% enhancement in reliability towards to tree topology. © 2017 Chinese Institute of Electronics.


Bin T.,Chengdu Aeronautic Vocational and Technical College | Wu H.,Second Research Institute of Civil Aviation Administration of China | Wei P.,Sichuan Agricultural University
2013 International Conference on Communications, Circuits and Systems, ICCCAS 2013 | Year: 2013

The performance of adaptive signal processing in airborne phased radar is decreased greatly in the clutter environment. An improved quiescent pattern control approach is provided to solve this problem. The new approach uses a novel constraint which estimates the solution via Taylor series, where adaptive processing is non-orthogonal which is limited in localized processing region. The approach can mitigate clutter efficiently while maintain lower sidelobe. It has low sample support requirement, convenient implementation and low computation load. Performance analysis is carried out using simulated data. The results prove the effectiveness of the proposed approach in improving the reduced-rank STAP framework in beam-space. © 2013 IEEE.


Yin M.,Chinese Academy of Agricultural Sciences | Zhu X.,Second Research Institute of Civil Aviation Administration of China | Liu Y.,Chinese Academy of Agricultural Sciences | Zhong J.,China Agricultural University | Chen F.,Chinese Academy of Agricultural Sciences
Chinese Journal of Chromatography (Se Pu) | Year: 2011

A new chiral stationary phase for gas chromatography; heptakis 2,3,6-tri-O-methoxymethyl-β-cyclodextrin was synthesized by substituting the 2,3,6-OH groups of β-cy-clodextrin with methoxymethyl groups and a coated capillary column for gas chromatography was made by coating this new stationary phase with static method. The chromatographic properties and separation abilities of the prepared stationary phase were studied. The test results showed that it possessed good separation abilities to Grob test mixture; disubstituted benzene isomers e.g. nitrotoluenes bromotoluenes dichlorobenzenes dimethylbenzenes and some chiral compounds such as methyl 2-hydroxypropionates ethyl 2-hydroxypropionates methyl 2-methylsulfonylpropionates. The comparison of chiral separation results between 2,3,6-tri-O-methoxymethyl-β-cyclodextrin and 2,3,6-tri-0-methyl-β-cyclodextrin showed that the separation abilities of the two stationary phases were different and complementary to each other for some chiral ester enantiomers.


Pu Y.-F.,Sichuan University | Zhang N.,University of Sichuan | Wang H.,Second Research Institute of Civil Aviation Administration of China | Chen S.-S.,Sichuan University | And 2 more authors.
Journal of Circuits, Systems and Computers | Year: 2016

This paper mainly discusses the order-frequency characteristics of a promising circuit element: fractor. The concept of fractance, as the fractional-order impedance of a fractor, arose following the successful synthesis of a fractional differentiator or integrator in an analog circuit. In this paper, we studied some electrical properties of a fractor. In particular, the order-frequency characteristics of a fractor are introduced. First, the order-sensitivity characteristics of a fractor are proposed. Second, the order-frequency characteristics of a fractor are studied. Third, the time constant of a fractor is analyzed. Last, through mathematical analysis and simulation results, we discussed in detail some issues of the electrical properties of a fractor, especially its time constant. © 2016 World Scientific Publishing Company


Chen K.,Second Research Institute of Civil Aviation Administration of China | Sun T.,Sichuan Normal University
Asia-Pacific Journal of Chemical Engineering | Year: 2013

The incomplete regeneration of diesel particulate filter may cause a local build-up of the soot on the partially regenerated areas during next filtration cycle. This may be one of reasons causing the melting of the ceramic filter during regeneration. In this paper, we investigated several situations at which the particulate matter was partially regenerated. The simulations illustrated that at stationary feed conditions, the influence of nonuniformity of soot loading on the peak temperature rise was less important. When regeneration was conducted at transient feed conditions, the peak temperature attained under the condition of uneven soot distribution along the channel, especially more soot accumulated near the end of the diesel particulate filter, was much higher than that attained under the condition of even soot distribution inside the channel. © 2013 Curtin University of Technology and John Wiley & Sons, Ltd.


Sun T.,Sichuan Normal University | Chen K.,Second Research Institute of Civil Aviation Administration of China
Asia-Pacific Journal of Chemical Engineering | Year: 2013

To achieve the goal of implementation of low-energy and low-chemical usage for trace organic compound removal, the hybrid oxidation/adsorption purification system using nitrogen-doped titanium dioxide catalytic oxidation followed by activated carbon adsorption was proposed in this paper. When isopropyl alcohol, ethylene glycol, and urea were selected as model components, superior oxidation effects were achieved by combination of nitrogen-doped titanium dioxide with 254 nm UV unit than by traditional high-energy-consumed 185 nm UV unit, which indicated such configuration would be an ideal candidate to replace the current high-energy-consumed UV unit. By incorporating this new configuration into the semiconductor wastewater recycling system, the granule-activated carbon bed adsorption efficiency for total organic carbon was compared with the granule-activated carbon adsorption efficiency for total organic carbon in traditional purification system, where the 185 nm UV lamp was used as oxidation unit. The experimental results showed that the hybrid low energy consumption catalytic oxidation/adsorption system had higher efficiency than the traditional high-energy-consumed oxidation/adsorption system for trace organic compound removal. This was because the radicals formed in the UV oxidation process reacted with the organic compounds adsorbed on the activated carbon and regenerated the adsorption sites. This self-cleaning mechanism effectively extended the lifetime of activated carbon bed and increased its adsorption capability. © 2013 Curtin University of Technology and John Wiley & Sons, Ltd.


Chen K.,Second Research Institute of Civil Aviation Administration of China | Sun T.,Sichuan Normal University | Xiang H.,Second Research Institute of Civil Aviation Administration of China
Asia-Pacific Journal of Chemical Engineering | Year: 2016

The high vapor pressure of diethylene glycol monomethyl ether, the only approved civil aviation fuel system icing inhibitor (FSII), causes the peeling of fuel tank topcoat material. This leads to increased maintenance costs and decreased aircraft mission capabilities. Triethylene glycol monomethyl ether (TriEGME) has been proposed as a potential replacement as it has a low vapor pressure and can partition into any free water in the fuel forming a solution with a low freezing point. However, its use has not been approved by airworthiness authority because very few data are available for its impacts on water solubility and icing behavior in fuel. The effects of TriEGME on water solubility, solidification temperature, and water icing behavior in fuel were thoroughly studied. At added concentration ranging from 0.10 to 0.15 vol. % water solubility in jet fuel almost tripled compared with that without FSII. The solidification temperatures for water in fuel with FSII and for mixture of water and FSII decreased with increased FSII concentration. Moreover, partition coefficient, defined as equilibrium FSII concentration in aqueous phase divided by equilibrium FSII concentration in fuel phase, decreased with increased FSII concentration in fuel. At equilibrium condition with fixed FSII concentration in fuel, decrease in fuel temperature led to an increase in partition coefficient. An estimation of required dosage for TriEGME to prevent water icing in fuel can be achieved by comparison of TriEGME concentration in aqueous phase with its corresponding freezing temperature. © 2015 Curtin University of Technology and John Wiley & Sons, Ltd.


Sun T.,Sichuan Normal University | Chen K.,Second Research Institute of Civil Aviation Administration of China
Canadian Journal of Chemical Engineering | Year: 2014

Earlier work showed that the commercial granular activated carbon (GAC) could effectively remove large non-polar molecules, but showed poor removal efficiency for small polar compounds such as isopropyl alcohol (IPA) [Schmotzer et al. Clean Technol. Environ. Policy 2002;4:125; Cong et al. J. Phys. Chem. C 2007;111:6976]. To achieve the goal of increasing the lifetime and removal efficiency of GAC bed for small polar organic compounds in ultrapure water (UPW), the synergistic partial photocatalytic oxidation and adsorption system using commercial GAC coated with nitrogen doped titanium dioxide as an adsorbate was proposed in this work. The influence of operating factors such as UV intensity, flow rate, feed concentration, and the sudden injection of air or inorganic acid on IPA removal efficiency was systematically investigated. Compared to the traditional GAC adsorption bed, at feed total organic carbon (TOC) concentration of 800ppb, the lifetime of GAC bed in this synergistic photocatalytic oxidation and adsorption system was extended from 348 to 600min and the outlet TOC concentration was decreased from 793 to 499ppb. The difference of the TOC outlet concentration in those two configurations was attributed to the photocatalytic effect by GAC coated with nitrogen doped titanium dioxide. The reactions between oxidation radicals and organic contaminants caused the majority of IPA to be decomposed into secondary organic compounds such as acetone and acetone had already been shown a higher affinity to GAC than that of IPA. Experiments also demonstrated the injection of air or inorganic acid in the stream would facilitate the removal of IPA in UPW. © 2014 Canadian Society for Chemical Engineering.

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