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Songtao W.,China University of Mining and Technology | Shuai Y.,China University of Mining and Technology | Zhiyang X.,Mining Products Safety Approval and Certification Center | Yu Y.,Yongmei company
Electronic Journal of Geotechnical Engineering | Year: 2014

The dynamic response mechanism of the rock fragmentation and its influential factors by TBM disc cutter are studied in this paper. Firstly, a dynamic response model is established based on the fracture mechanics and finite element theory. Secondly, a fragmentation rule is founded according to the dynamic response model, and then numerical simulations for dynamic response of rock are carried out. Lastly, cutting experiments are carried out in order to check the numerical simulation. The simulation and experiment results for different rocks show that the rock cutting depth and the crushing region decrease with increase of the rock compressive strength. The simulation and experiment results for different loads show that the fragmentation scale is proportional to the cutting force for the same rock. © 2015 ejge.


He K.,China University of Mining and Technology | He K.,Mining Products Safety Approval and Certification Center | Zhang Y.-L.,Taiyuan University of Technology | Shi J.-W.,China University of Mining and Technology | Wang F.-Y.,China University of Mining and Technology
Meitan Xuebao/Journal of the China Coal Society | Year: 2016

The complex macromolecular matrix of coal was divided into the elements of C, O, H, S and N, which were involved in the oxidation reaction. Based on the changes of element contents during coal oxidation process at low temperature, the three kinetic models, including pseudo-first-order kinetics model, Coats and Redfern's model, and Freeman and Carroll's model, were introduced to investigate the kinetic characteristics of coal oxidation at low temperature. Kinetic study reveals that the evolutions of these elements during coal oxidation at low temperature follow pseudo-first order kinetics and Coats and Redfern's model. The activation energies for these elements evolution in the oxidation process by using the pseudo-first order kinetics have been found to be almost similar to those calculated by applying the Coats and Redfern's equation. The reaction rates computed by the pseudo-first order kinetics are very low and have been found to be 10-5-10-6, suggesting a very low rate of successful collisions for the formation of activated complex. A kinetic compensation effect between the activation energy and exponential facto was also observed for the evolutions of these elements. © 2016, Editorial Office of Journal of China Coal Society. All right reserved.


Li B.,China University of Mining and Technology | Li B.,Mining Products Safety Approval and Certification Center | Wang Q.,China University of Mining and Technology | Zhang Y.,Mining Products Safety Approval and Certification Center | And 2 more authors.
International Journal of Electrochemical Science | Year: 2013

Single-crystalline nanorods of monoclinic Li2MnO3 with about 200 nm in width and around 8 μm in length have been synthesized via a template-sintered reaction using γ-MnOOH nanorods as a template. Nickel-modified and Zirconium-modified Li2MnO3 cathode are also obtained respectively. Nickel-modified Li2MnO3 cathode (0.5Li2MnO3.0.5LiMn0.5Ni0.5O2) delivers the highest initial discharge capacity of 497 mAh/g at 0.1 C in the voltage range of 2.0-4.6 V. Although without distinct higher discharge capacity, Zirconium-modified Li2MnO3 cathode (0.5Li2MnO3.0.5LiMn0.5Zr0.5O2) improves cycle stability to a certain extent. Voltage plateaus of cathode materials can be apparently observed after modified by Nickel and Zirconium and electrochemical performance is enhanced. © 2013 by ESG.


Li B.,Mining Products Safety Approval and Certification Center | Dang Z.,Mining Products Safety Approval and Certification Center | Zhang Y.,Mining Products Safety Approval and Certification Center | Song Z.,Mining Products Safety Approval and Certification Center
International Journal of Electrochemical Science | Year: 2014

The present work describes using γ-MnOOH nanorods as a self-template to form Li-Mn-O compounds via hydrothermal process and state reaction, and a key finding in phase transition from cubic to monoclinic with Li content increasing. As the cathode material for lithium batteries, the electrochemical performances of as-prepared materials are investigated. © 2014 The Authors.

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