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Yao X.-R.,Huainan Vocational and Technical College | Cheng G.-L.,Huainan Mining Group Co. | Shi B.-M.,Anhui University of Science and Technology
Meitan Xuebao/Journal of the China Coal Society | Year: 2010

According to difficult pore-forming when long drilling through mudstone, structural belt and soft seam, studied return airway 11-2 level -910 m Dingji Coal Mine using FLAC3D computer numerical simulation with fact mechanical parameters of rock mass, calculated drilling stress field, displacement filed and change of plastic failure zone, and concluded that secondary stress elastic-plastic distribution map of drilling was consistent with the theoretical calculation. The distribution of secondary stress elastic-plastic was no longer a ring when side pressure coefficient was not equal 1, the roof and floor radial displacement of drilling was two times of two sides. The stress concentration degree of surrounding rock becomes higher, the displacement of drilling increases, the plastic radius of surrounding rock decreases, and the drilling becomes more instable with the increase of side pressure coefficient. When strengthening area of surrounding rock increases, the secondary stress influence scope of drilling reduces, the radius of plastic area decreases, the radial displacement of drilling decreases, and the drilling is easier to be stable. Based on the theory of drilling creating by solidification technology, the gas extraction drilling instability was controlled effectively in deep surrounding-rock with weak structure crossheading 1421(1) Dingji Coal Mine, and verified with case. Source

Hu S.,Anhui University of Science and Technology | Hu S.,Huainan Vocational and Technical College | Yan J.,Anhui University of Science and Technology | Liu S.,China University of Mining and Technology
Yanshilixue Yu Gongcheng Xuebao/Chinese Journal of Rock Mechanics and Engineering | Year: 2015

The continuous pulse shock and vibration can change the occurrence of gas in coal and improve the permeability of the coal seam and enhance the efficiency of gas drainage. Deformed coal containing gas was simulated in the laboratory. With the influence of continuous pulse shock and vibration, the release of gas speed can be improved above 30%. A device which is suit for the underground coal mine and can make the instantaneous vibration energy reach to 60 kJ was designed. The field test was performed through 6 'downward' radial boreholes. The results show that the speed of gas drainage increases about 56% and the effective fall time is about 54 min. ©, 2015, Academia Sinica. All right reserved. Source

Yang J.,Anhui University of Science and Technology | Yin Z.-X.,Anhui University of Science and Technology | Huang K.-F.,Huainan Vocational and Technical College
Lecture Notes in Electrical Engineering | Year: 2011

Traveling salesman problem is the NP problem of graph theory. The superior solution for traveling salesman problem is the Hamilton ring that finds out to have minimum power in the graph. The triple-stranded DNA computing model has a low rate of wrong solutions. Because the pool of data generated, there are the double helix structure of DNA chain, and the stability of the double-stranded DNA than single strand of DNA stability. The use of triple-stranded DNA model, can be solved with plans to optimize the combination of some of the NP problem. In this paper we show that triple-stranded DNA structure model can be used for solving the traveling salesman problem. © 2011 Springer-Verlag. Source

Song L.,Anhui University of Science and Technology | Yang L.,Anhui University of Science and Technology | Han J.,Huainan Vocational and Technical College | Li J.,Peking University
Journal of Computers | Year: 2011

A Bayesian Belief Network (BBN) is a valuable tool to represent the causal relationships that exist in a given set of variables. This paper presents a methodology for organizational risk analysis for safety management. Learning a BBN from data is a difficult and resource-consuming task, we presents the implementation of a greedy algorithm that automatically constructs a BBN from a dataset of cases obtained. The resulting BBN reflect installation specific factors respect to organizational factors and show the dependencies that exist among key variables that are associated to the trip generation process. © 2011 ACADEMY PUBLISHER. Source

Han J.,Huainan Vocational and Technical College | Song M.,Anhui University of Finance and Economics
Journal of Computers | Year: 2011

As data envelopment analysis (DEA) has been developed both in theory and application, the calculation of models become more and more important. Although many DEA software tools have been built for the calculation of the DEA models, there are some deficiencies in embedding them into enterprise management information system (MIS). As an extension of this work, an idea was generated in this paper, which could both calculate the DEA and further support the decision making for decision making units (DMUs), i.e., the organizations, in the information environment. This is an attempt to bridge between DEA and MIS. And we could demonstrate this approach for building efficiency evaluation information system. Furthermore, an efficiency evaluation information system of company A, which was built by ourselves, was shown to illustrate our purpose. © 2011 ACADEMY PUBLISHER. Source

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