Entity

Time filter

Source Type


Gao W.,Jilin University | Gao W.,Panjin Vocational and Technical College | Cui Z.,Jilin University | Wang K.,Jilin University
Journal of Sound and Vibration | Year: 2013

Based on Pride theory, we studied the propagation of seismoelectric waves in a fluid-filled poroelastic hollow cylinder. We presented the expressions of seismoelectric waves in the poroelastic hollow cylinder, acoustic and electromagnetic field in inner and outer of the hollow cylinder, and we used the boundary condition to determine acoustic and electromagnetic field. Also this problem is accomplished by using the quasi-static method. The numerical simulation is operated on acoustic field and electromagnetic field in inner fluid of hollow poroelastic cylinder, and the transient waveform is obtained. It shows that there is no difference on the graph between the electric field obtained from Pride equations and that obtained from quasi-static method. The influence of hollow cylinder thickness, molarity and permeability on wave amplitude are discussed. The results show that for the acoustic field the amplitude of longitudinal mode and Stoneley wave will increase with hollow cylinder thickness increasing, and for the converted axial electric field the amplitude of Stoneley wave increases with hollow cylinder thickness increasing, while the amplitude of longitudinal mode will decrease. The amplitude of electric field in inner fluid will decrease with the molarity of fluid increasing. The amplitude of the fluid acoustic and electric field will decrease with the permeability increasing. The influence of impermeable outer surface on the amplitude of longitudinal wave is obviously much larger than that of Stoneley wave in the electric field. © 2013 Elsevier Ltd. Source


Huang D.,Qinzhou University | Gao J.,Panjin Vocational and Technical College
International Journal of Online Engineering | Year: 2015

With the development of pen-based mobile device, on-line signature verification is gradually becoming a kind of important biometrics verification. This thesis proposes a method of verification of on-line handwritten signatures using both Support Vector Data Description (SVM) and Genetic Algorithm (GA). A 27-parameter feature set including shape and dynamic features is extracted from the on-line signatures data. The genuine signatures of each subject are treated as target data to train the SVM classifier. As a kernel based one-class classifier, SVM can accurately describe the feature distribution of the genuine signatures and detect the forgeries. To improving the performance of the authentication method, genetic algorithm (GA) is used to optimise classifier parameters and feature subset selection. Signature data form the SVC2013 database is used to carry out verification experiments. The proposed method can achieve an average Equal Error Rate (EER) of 4.93% of the skill forgery database. Source


Zhao Z.-M.,Panjin Vocational and Technical College | Li G.-K.,China Oilfield Services Ltd.
Well Testing | Year: 2016

To make the work-over rig align to the wellhead conveniently, quickly, efficiently and accurately in down-hole operation, a new type of omnidirectional mobile carrying device has been developed which is not restricted by well site environment. This tool is mainly composed of fixed frame, central axis, clamping support, sliding roller, reversing shaft, driving motor, explosion-proof switch box, and supporting base. Field application of it realizes that the work-over rig aligns to the wellhead accurately, which improves the efficiency of down-hole operation, reduces the labor intensity of operators, and overcomes the shortcomings of the existing work-over rig due to environmental constraints cannot move their body and could not reach the position of construction. © 2016, The Editorial Department of Well Testing. All right reserved. Source


Xu X.,Qingdao University of Science and Technology | Xu X.,Panjin Vocational and Technical College | Wu Y.,Qingdao University of Science and Technology | Wang C.,Shenyang University of Chemical Technology
Designed Monomers and Polymers | Year: 2015

In this work, a novel DOPO-based spiroorthocarbonate (DSOC), 6,6-((3,9-diethyl-1,5,7,11-tetraoxaspiro[5.5]undecane-3,9-diyl)bis(hydroxymethylene))bis(6H-dibenzo[c,e][1,2]oxaphosphinine 6-oxide) was synthesized and confirmed with 1H, 31P, 13C NMR, and FT-IR spectra. It was used as anti-shrinkage additive and flame retardant in the cationic polymerization of epoxy resin. The shrinkage of the cured epoxy resin containing DSOC was investigated by measuring the density of the system before and after curing. It was found that the shrinkage of epoxy resin changed from -1.49 to 1.43% with the content of DSOC increased to 20 wt%, not only the shrinkage of epoxy resin was eliminated, but also a slight expansion was achieved. The flame retardancy and thermal stability of the cured epoxy resins were tested by limiting oxygen index (LOI), vertical burning test (UL-94), and thermogravimetric analysis (TGA). LOI values increased from 19.9% for pure E-51 to 30.9% for modified epoxy resins, UL-94 V-0 rating can be obtained with 15 wt% DSOC. The mechanical properties of the modified epoxy resin were also investigated. The results showed that DSOC was a promising anti-shrinkage additive and flame retardant for epoxy resins. © 2015 © 2015 Taylor & Francis. Source


Han Z.-B.,Liaoning University | Xiao Z.-Z.,Liaoning University | Hao M.,Liaoning University | Yuan D.-Q.,CAS Fujian Institute of Research on the Structure of Matter | And 4 more authors.
Crystal Growth and Design | Year: 2015

A luminescent metal-organic framework was assembled by using 3,3′-((6-hydroxy-1,3,5-triazine-2,4-diyl)bis(azanediyl))dibenzoic acid and Zn(II), which exhibits a 2D layer architecture, and the adjacent layers are further stacked via hydrogen-bonding and N⋯N van der Waals interactions to form a 3D supramolecular framework. This material can be used as fluorescent probe of K+ ion. © 2015 American Chemical Society. Source

Discover hidden collaborations