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Development of high-power microwave mechanical integrated continuous device

JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING 2024年第9期16卷 3365-3377页

作者： Feng, Xia-Ting Lin, Feng Zhang, Jiuyu Yang, Chengxiang Ao, Yuntan tong, tianyang Northeastern Univ Key Lab Minist Educ Safe Min Deep Met Mines Shenyang 110819 Peoples R China Northeastern Univ Key Lab Liaoning Prov Deep Engn & Intelligent Tec Shenyang 110819 Peoples R China

This article introduces a high-power microwave mechanical integrated continuous mining device, which can achieve synchronous cutting of hard rocks by microwave and machinery. The device includes a cutting system, a rotary translation system, a loading system, a high-power microwave system, and a control and monitoring system. The technology of "master-slave follow-up" disc cutter alternating side cutting of rock was proposed, which could improve the effectiveness of rock breaking. The integrated structure of a microwave-cut system was then proposed, and synchronous motion of the microwave-cut system and adjustment of the loading system could be realized. The automatic adjustment technology of the microwave working distance was developed to dynamically control the optimal microwave working distance. The basic functions of the equipment were verified by tests. By comparing the two types of disk cutters, it is found that the master-slave follow-up disk cutter can improve significantly the dust removal effect and rock breaking efficiency in rock breaking process versus the conventional large disc cutter. Cutting tests of slate with or without microwave were conducted using a master-slave follow-up disk cutter. The results show that the cutting patterns of slates change from intermittent chunks (without microwave irradiation) to persistent debris (with microwave irradiation), and the cutting speed is significantly improved (170%). The development of the device provides a scientific basis for changing the conventional mining technology of metal mines and realizing the mechanical continuous mining in hard metal mines. (c) 2024 Institute of Rock and Soil Mechanics, Chinese Academy of Sciences. Production and hosting by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://***/ licenses/by-nc-nd/4.0/).

关键词： Hard metal mine Microwave machinery Continuous mining Master-slave follow-up disc cutter IRRADIATION

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Field test of high-power microwave-assisted mechanical excavation for deep hard iron ore

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Journal of Rock Mechanics and Geotechnical Engineering 2024年第6期16卷 1922-1935页

作者： Feng Lin Xia-Ting Feng Shiping Li Xiao Hai Jiuyu Zhang Xiangxin Su tianyang tong Jianchun Song Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines Northeastern UniversityShenyang110819China Benxi Longxin Mining Corporation Limited Benxi117000China

Microwave-assisted mechanical excavation has great application prospects in mines and tunnels,but there are few field experiments on microwave-assisted rock *** paper takes the Sishanling iron mine as the research object and adopts the self-developed high-power microwave-induced fracturing test system for hard rock to conduct field experiments of microwave-induced fracturing of iron *** heating and reflection evolution characteristics of ore under different microwave parameters(antenna type,power,and working distance)were studied,and the optimal microwave parameters were ***,the ore was irradiated with the optimal microwave parameters,and the cracking effect of the ore under the action of the high-power open microwave was *** results show that the reflection coefficient(standing wave ratio)can be rapidly(<5 s)and automatically adjusted below the preset threshold value(1.6)as microwave irradiation is *** using a right-angle horn antenna with a working distance of 5 cm,the effect of automatic reflection adjustment reaches the best among other antenna types and working *** the working distance is the same,the average temperature of the irradiation surface and the area of the high-temperature area under the action of the two antennas(right-angled and equal-angled horn antenna)are basically the same and decrease with the increase of working *** optimal microwave parameters are:a right-angle horn antenna with a working distance of 5 ***,in further experiments,the optimal parameters were used to irradiate for 20 s and 40 s at a microwave power of 60 kW,*** surface damage extended 38 cm×30 cm and 53 cm×30 cm,respectively,and the damage extended to a depth of about 50 *** drilling speed was increased by 56.2%and 66.5%,respectively,compared to the case when microwaves were not used.

关键词： Microwave parameters High power Field experiment Mechanical mining

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Mitochondrial targeting sequence of magnetoreceptor MagR:More than just targeting

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Zoological Research 2024年第3期45卷 468-477页

作者： Yanqi Zhang Peng Zhang Junjun Wang Jing Zhang tianyang tong Xiujuan Zhou Yajie Zhou Mengke Wei Chuanlin Feng Jinqian Li Xin Zhang Can Xie Tiantian Cai High Magnetic Field Laboratory Hefei Institutes of Physical ScienceChinese Academy of SciencesHefeiAnhui 230031China University of Science and Technology of China HefeiAnhui 230026China Department of Anatomy School of Basic MedicineAnhui Medical UniversityHefeiAnhui 230032China Institutes of Physical Science and Information Technology Anhui UniversityHefeiAnhui 230039China Key Laboratory of Tropical Translational Medicine of Ministry of Education NHC Key Laboratory of Tropical Disease ControlSchool of Tropical Medicine and The Second Affiliated HospitalHainan Medical UniversityHaikouHainan 571199China International Magnetobiology Frontier Research Center Science IslandHefeiAnhui 230031China Institute of Quantum Sensing Zhejiang UniversityHangzhouZhejiang 310027China

Iron-sulfur clusters(ISC)are essential cofactors for proteins involved in various biological processes,such as electron transport,biosynthetic reactions,DNA repair,and gene expression *** assembly protein IscA1(or MagR)is found within the mitochondria of most ***(MagR)is a highly conserved A-type iron and iron-sulfur cluster-binding protein,characterized by two distinct types of iron-sulfur clusters,[2Fe-2S]and[3Fe-4S],each conferring unique magnetic *** forms a rod-like polymer structure in complex with photoreceptive cryptochrome(Cry)and serves as a putative magnetoreceptor for retrieving geomagnetic information in animal *** the N-terminal sequences of MagR vary among species,their specific function remains *** the present study,we found that the N-terminal sequences of pigeon MagR,previously thought to serve as a mitochondrial targeting signal(MTS),were not cleaved following mitochondrial entry but instead modulated the efficiency with which iron-sulfur clusters and irons are ***,the N-terminal region of MagR was required for the formation of a stable MagR/Cry ***,the N-terminal sequences in pigeon MagR fulfil more important functional roles than just mitochondrial *** results further extend our understanding of the function of MagR and provide new insights into the origin of magnetoreception from an evolutionary perspective.

关键词： Magnetoreceptor(MagR) N-terminal sequence Mitochondrial targeting signal Iron-sulfur cluster

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Unexpected divergence in magnetoreceptor MagR from robin and pigeon linked to two sequence variations

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Zoological Research 2024年第1期45卷 69-78页

作者： Shun Wang Peng Zhang Fan Fei tianyang tong Xiujuan Zhou Yajie Zhou Jing Zhang Mengke Wei Yanqi Zhang Lei Zhang Yulong Huang Lin Zhang Xin Zhang Tiantian Cai Can Xie Institutes of Physical Science and Information Technology Anhui UniversityHefeiAnhui 230039China High Magnetic Field Laboratory Hefei Institutes of Physical ScienceChinese Academy of SciencesScience IslandHefeiAnhui 230031China Science Island Branch of Graduate School University of Science and Technology of ChinaHefeiAnhui 230036China Department of Anatomy Anhui Medical UniversityHefeiAnhui 230032China Department of Mechanical and Aerospace Engineering University at BuffaloState University of New YorkBuffaloNY 14260 USA International Magnetobiology Frontier Research Center Science IslandHefeiAnhui 230031China

Birds exhibit extraordinary mobility and remarkable navigational skills,obtaining guidance cues from the Earth’s magnetic field for orientation and long-distance *** species also show tremendous diversity in navigation strategies,with considerable differences even within the same taxa and among individuals from the same *** highly conserved iron and iron-sulfur cluster binding magnetoreceptor(MagR)protein is suggested to enable animals,including birds,to detect the geomagnetic field and navigate ***,MagR is also implicated in other functions,such as electron transfer and biogenesis of iron-sulfur clusters,raising the question of whether variability exists in its biochemical and biophysical features among species,particularly *** the current study,we conducted a comparative analysis of MagR from two different bird species,including the migratory European robin(Erithacus rubecula)and the homing pigeon(Columba livia).Sequence alignment revealed an extremely high degree of similarity between the MagRs of these species,with only three sequence ***,two of these variations underpinned significant differences in metal binding capacity,oligomeric state,and magnetic *** findings offer compelling evidence for the marked differences in MagR between the two avian species,potentially explaining how a highly conserved protein can mediate such diverse functions.

关键词： Homing and migration Animal navigation Magnetoreceptor(MagR) Diverse navigation pattern Conserved protein

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Dynamic fragmentation of microwave irradiated rock

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Journal of Rock Mechanics and Geotechnical Engineering 2021年第2期13卷 300-310页

作者： Shuai Wang Ying Xu Kaiwen Xia tianyang tong State Key Laboratory of Hydraulic Engineering Simulation and Safety School of Civil EngineeringTianjin UniversityTianjin300072China Department of Civil and Mineral Engineering University of TorontoTorontoM5S 1A4Canada Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines Northeastern UniversityShenyang110819China

The microwave-assisted rock fragmentation has been proven to be a promising approach in reducing cutting tools wear and improving efficiency in rock crushing and ***,understanding the influence of damage induced by microwave irradiation on rock fragmentation is *** this context,cylindrical Fangshan granite(FG)specimens were exposed to microwave irradiation at a power of 6 kW for different durations up to 4.5 *** damages of the specimens induced by irradiation were quantified by using both X-ray micro-CT scanning and ultrasonic wave *** CT value and Pwave velocity decreased with increase of irradiation *** irradiated specimens were then tested using a split Hopkinson pressure bar(SHPB)system to simulate rock fragmentation.A momentum-trap technique was utilized to ensure single-pulse loading on the specimen in SHPB tests,enabling valid fragment size distribution(FSD)*** dependence of dynamic uniaxial compressive strength(UCS)on the irradiation duration and loading rate was *** dynamic UCS increased with increase of loading rate while decreased with increase of irradiation *** the sieve analysis,three fragmentation types were proposed based on FSD,which were dictated by both loading rate and irradiation *** addition,an average fragment size was proposed to quantify *** results showed that the average fragment size decreased with increase of loading rate.A loading rate range was identified,where a dramatic reduction of the average fragment size *** dependence of fragmentation on the irradiation duration and loading rate was also discussed.

关键词： Microwave irradiation Split Hopkinson pressure bar(SHPB) Momentum-trap Dynamic compressive strength Fragment size distribution(FSD) Fangshan granite(FG)

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Microwave response characteristics and influencing factors of ores based on dielectric properties of synthetic samples

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Journal of Rock Mechanics and Geotechnical Engineering 2022年第2期14卷 315-328页

作者： Feng Lin Xia-Ting Feng Chengxiang Yang Shiping Li Jiuyu Zhang Xiangxin Su tianyang tong Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines Northeastern UniversityShenyang110819China

In order to understand the influence of different factors on the microwave response characteristics of ores,the effects of electrical conductivity,metal mineral content,compactness,metal mineral distribution,microwave frequency and temperature on the dielectric properties of synthetic ores(metal mineral and quartz)were *** heating tests were carried out on three types of natural ores(Hongtoushan copper ore,Sishanling iron ore and Dandong gold ore)with significant differences in metal mineral *** test results showed that under microwave irradiation,the stronger the electrical conductivity of the metal minerals,the smaller the penetration depth in synthetic *** those metal minerals with lower electrical conductivity,the microwave absorption coefficient of the synthetic samples increases with increasing metal mineral *** those metal minerals with higher electrical conductivity,the microwave absorption coefficient of the samples first increases and then decreases as the metal mineral content *** the metal minerals are distributed in layers,the penetration depth is much less than that given a uniform *** penetration depth in the sample at microwave frequency of 915 MHz is greater than that at 2.45 *** higher the electrical conductivity of metal minerals used in synthetic ores,the higher the high-temperature sensitivity of electromagnetic shielding coefficient(0.C-500.C).The Hongtoushan copper ore with high metal mineral content exhibits obvious size *** effects of ore structure and crystal particle size on the distribution characteristics of microcracks were *** on the test results,a quantitative prediction model of microwave sensitivity of ore was proposed,which provides guidance for the prediction of ore heating effect and the selection of microwave heating sequence of ore.

关键词： Metal minerals Electrical conductivity Metal mineral content Synthetic ore Prediction model

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An open-end high-power microwave-induced fracturing system for hard rock

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Journal of Rock Mechanics and Geotechnical Engineering 2023年第12期15卷 3163-3172页

作者： Xia-Ting Feng Jiuyu Zhang Feng Lin Chengxiang Yang Shiping Li tianyang tong Xiangxin Su Key Laboratory of Ministry of Education on Safe Mining of Deep Metal Mines Northeastern UniversityShenyang110819China

Microwave pre-treatment is considered as a promising technique for alleviating cutter wear. This paper introduces a high-power microwave-induced fracturing system for hard rock. The test system consists of a high-power microwave subsystem (100 kW), a true triaxial testing machine, a dynamic monitoring subsystem, and an electromagnetic shielding subsystem. It can realize rapid microwave-induced fracturing, intelligent tuning of impedance, dynamic feedback under strong microwave fields, and active control of microwave parameters by addressing the following issues: the instability and insecurity of the system, the discharge breakdown between coaxial lines during high-power microwave output, and a lack of feedback of rock-microwave response. In this study, microwave-induced surface and borehole fracturing tests under true triaxial stress were carried out. Experimental comparisons imply that high-power microwave irradiation can reduce the fracturing time of hard rock and that the fracture range (160 mm) of a 915-MHz microwave source is about three times that of 2.45 GHz. After microwave-induced borehole fracturing, many tensile cracks occur on the rock surface and in the borehole: the maximum reduction of the P-wave velocity is 12.8%. The test results show that a high-power microwave source of 915 MHz is more conducive to assisting mechanical rock breaking and destressing. The system can promote the development of microwave-assisted rock breaking equipment.

关键词： Hard rock engineering High-power microwave Microwave intelligent fracturing Dynamic feedback True triaxial stress

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Mitochondrial targeting sequence of magnetoreceptor MagR:More than just targeting

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Zoological Research 2024年第3期 468页

作者： Yanqi Zhang Peng Zhang Junjun Wang Jing Zhang tianyang tong Xiujuan Zhou Yajie Zhou Mengke Wei Chuanlin Feng Jinqian Li Xin Zhang Can Xie Tiantian Cai

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Unexpected divergence in magnetoreceptor MagR from robin and pigeon linked to two sequence variations

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Zoological Research 2024年第1期

作者： Shun Wang Peng Zhang Fan Fei tianyang tong Xiujuan Zhou Yajie Zhou Jing Zhang Mengke Wei Yanqi Zhang Lei Zhang Yulong Huang Lin Zhang Xin Zhang Tiantian Cai Can Xie

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Proactive Resilience Enhancement of Power Systems with Link Transmission Model-based Dynamic Traffic Assignment Among Electric Vehicles

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CSEE Journal of Power and Energy Systems 2024年第3期10卷 1320-1330页

作者： Haoyuan Yan tianyang Zhao Zhanglei Guan Energy Electricity Research Center Jinan UniversityGuangzhou 510632China Energy Research Institute Nanyang Technological UniversitySingapore IEEE

The rapid development of electric vehicles(EVs)is strengthening the bi-directional interactions between electric power networks(EPNs)and transportation networks(TNs)while providing opportunities to enhance the resilience of power systems towards extreme *** quantify the temporal and spatial flexibility of EVs for charging and discharging,a novel dynamic traffic assignment(DTA)problem is *** DTA problem is based on a link transmission model(LTM)with extended charging links,depicting the interaction between EVs and power *** models the charging rates as continuous variables by an energy boundary *** consider the evacuation requirements of TNs and the uncertainties of traffic conditions,the DTA problem is extended to a two-stage distributionally robust *** is further incorporated into a two-stage distributionally robust unit commitment problem to balance the enhancement of EPNs and the performance of *** problem is reformulated into a mixed-integer linear programming problem and solved by off-the-shelf commercial *** studies are performed on two test *** effectiveness is verified by the numerical results,e.g.,reducing the load shedding amount without increasing the unmet traffic demand.

关键词： Coupled transportation and power network link transmission model resilience enhancement

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