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Experimental investigation on the anisotropy of friction property for dry and water-saturated rock

Friction 2024年第9期12卷 2064-2082页

作者： Qing YANG Mingming HE Jinrui ZHAO Mingchen DING Jing WANG State Key Laboratory of Eco.hydraulics in Northwest Arid Region Xi’an University of TechnologyXi’an 710048China china communication construction company mechanical and electrical engineering co. Ltd.Beijing 100088China

Friction properties of rock are closely co.nected with the *** anisotropy of rock friction can provide a valuable assessment for geotechnical and geological *** this study,the rotary friction tests were co.ducted to analyze the water effect on the friction property and the friction anisotropy of the four types of *** drilling response model(DD-model)was employed to characterize the rotary friction behavior of the *** parameters of this model include the three types of friction parameters:1/ς,μ,and f,where 1/ςandμare co.stant,and f is a variable.A quantitative method is proposed for assessing the anisotropy of rock *** results of the rotary friction tests indicate that the relation between torque force and thrust force co.forms to the *** changes of two friction co.stants 1/ςandμfrom dry state to water-saturated state suggest that the water effect on the friction strength of the rocks exhibits significant *** friction strength determined by the friction variable f increases first,then decreases,and finally stabilizes with the increasing of *** is an anisotropy index calculated by the proposed *** percentage difference of the average value of AIf between water-saturated and dry states shows the degree of the water effect on the friction anisotropy of the rocks,mudstone(MU)>granite(GR)>fine sandstone(FS)>argillaceous siltstone(AS).The quantitative model is hopefully co.structed for characterizing the relation between the anisotropic friction strength of rock and the moisture state in future.

关键词： anisotropy rotary friction test drilling response model(DD-model) effective stress law

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A Robust Resource Allocation Scheme for Device-to-Device communications Based on Q-Learning

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co.puters, Materials & co.tinua 2020年第11期65卷 1487-1505页

作者： Azka Amin Xihua Liu Imran Khan Peerapong Uthansakul Masoud Forsat Seyed Sajad Mirjavadi School of Business Qingdao UniversityQingdao266061China School of Eco.omics Qingdao UniversityQingdao266061China Department of electrical engineering University of Engineering and TechnologyPeshawarPakistan School of Telecommunication engineering Suranaree University of TechnologyNakhon RatchasimaThailand Department of mechanical and Industrial engineering College of EngineeringQatar UniversityDohaQatar

One of the most effective technology for the 5G mobile communications is Device-to-device(D2D)communication which is also called terminal pass-through *** can directly co.municate between devices under the co.trol of a base station and does not require a base station to forward *** advantages of applying D2D communication technology to cellular networks are:It can increase the communication system capacity,improve the system spectrum efficiency,increase the data transmission rate,and reduce the base station *** at the problem of co.channel interference between the D2D and cellular users,this paper proposes an efficient algorithm for resource allocation based on the idea of Q-learning,which creates multi-agent learners from multiple D2D users,and the system throughput is determined from the co.responding state-learning of the Q value list and the maximum Q action is obtained through dynamic power for co.trol for D2D *** mutual interference between the D2D users and base stations and exact channel state information is not required during the Q-learning process and symmetric data transmission mechanism is *** proposed algorithm maximizes the system throughput by co.trolling the power of D2D users while guaranteeing the quality-of-service of the cellular *** results show that the proposed algorithm effectively improves system performance as co.pared with existing algorithms.

关键词： 5G D2D communications power allocation algorithm resource optimization

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Research and Application of 3G electrical Safety Job Site Intelligent Monitoring Device

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Energy and Power engineering 2013年第4期5卷 881-883页

作者： Changqing Zhao Chenxu Zhao Heng Xu Haijun Zhang Minghao Sun The Bayannur power Bureau of Inner Mongolia Electric Power Group co.Ltd HuHeHaoTe China

This paper describes the shortco.ings and difficulties of power company security construction, such as site management for construction site security monitoring personnel is limited, in recent years , rural power grids and Urban Network alteration Faced with new situation. The use of advanced science and technology and communication terminal in order to better strengthen the means of power construction site safety supervision, improve the level of safety production supervision, design and development of a new electrical safety job site intelligent monitoring devices. The device co.sists of three parts of the remote wide angle 360 degrees of portable video surveillance equipment and 3G smart terminal equipment and portable battery. Through the application of such a device, professionals can remotely monitor the construction job site safety, diagnose, and effectively improve the security of the electricity sector management and reduce security risks and personnel on-site monitoring co.ts for improving the security of the entire power industry field operations with significance.

关键词： Safety electrical Intelligent Monitoring Application

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