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Microstructural evolution and strengthening mechanism of aligned steel fiber cement-based tail backfills exposed to electromagnetic induction

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International Journal of Minerals,Metallurgy and Materials 2024年第11期31卷 2390-2403页

作者： Xihao Li Shuai Cao Erol Yilmaz School of Civil and Resources Engineering University of Science and Technology BeijingBeijing 100083China State Key Laboratory of High-Efficient Mining and Safety of Metal Mines of Ministry of Education University of Science and Technology BeijingBeijing 100083China Department of Civil Engineering Geotechnical DivisionRecep Tayyip Erdogan UniversityFener Rize TR53100Turkey

Cemented tailings backfill(CTB)not only boosts mining safety and cuts surface environmental pollution but also recovers ores previously retained as pillars,thereby improving resource *** use of alternative reinforcing products,such as steel fiber(SF),has continuously strengthened CTB into *** approach prevents strength decreases over time and reinforces its long-term durability,especially when mining ore in adjacent underground *** this study,various microstructure and strength tests were performed on SFCTB,considering steel fiber ratio and electromagnetic induction strength *** findings show that combining steel fibers and their distribution dominantly influences the improvement of the fill’s ***’s strength rises by fiber insertion and has an evident correlation with fiber insertion and magnetic induction *** magnetic induction strength is 3×10^(-4) T,peak uniaxial compressive stress reaches 5.73 MPa for a fiber ratio of 2.0vol%.The cracks’expansion mainly started from the specimen’s upper part,which steadily expanded downward by increasing the load until damage *** doping of steel fiber and its directional distribution delayed crack *** the doping of steel fiber was 2.0vol%,SFCTBs showed excellent ductility *** energy required for fills to reach destruction increases when steel-fiber insertion and magnetic induction strength *** study provides notional references for steel fibers as underground filling additives to enhance the fill’s durability in the course of mining operations.

关键词： electromagnetic induction steel fiber cemented tailings backfill strength microstructure

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Effects of electromagnetic induction and noise on the regulation of sleep wake cycle

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Science China(Technological Sciences) 2019年第12期62卷 2113-2119页

作者： JIN WuYin WANG An MA Jun LIN Qian School of Mechanical and Electronical Engineering Lanzhou University of TechnologyLanzhou 730050China Department of Physics Lanzhou University of TechnologyLanzhou 730050China Editorial Department of Journal of Lanzhou University of Technology Lanzhou 730050China

As an exploration of electromagnetic induction effects on homeostatic regulation of sleep wake cycle, a magnetic flux term coupled with membrane current is proposed as an equivalent induction current act on a physiologically-motivated mathematical model, to study the effects of electromagnetic induction and its noise on the sleep wake cycle. The basic model includes 2 simplified Hodgkin-Huxley type neurons connected via glutamate(Glu) synapses, one of which additionally contains hypocretin/orexin(Hcrt/ox) as the functionally relevant co-transmitter. The numerical results suggest that when a constant current(DC) stimulus is applied to the model, the average fire frequency of the Hcrt/ox neuron could be modified from gamma to delta frequency with increased the intensity of electromagnetic induction, but the local Glu neuron transforms active into sleep ***, the homeostatic regulation function has better robustness to electromagnetic induction and its noise than the current or conductance noise, even there is a similar stochastic resonance phenomenon. For the circadian current input case, the time of wake up is delayed and fall asleep is advanced when the electromagnetic induction and its noise is considered. Furthermore, the effects of electromagnetic noise on the regulation is not significant, but only to inhibit the neuronal discharge activities and change the time of wake up and fall asleep of the Glu neuron, characterized by the sleep duration is slightly prolonged with increasing the strength of noise intensity.

关键词： electromagnetic induction sleep wake cycle noise neural model

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Stochastic resonance and synchronization behaviors of excitatory-inhibitory small-world network subjected to electromagnetic induction

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Chinese Physics B 2018年第4期27卷 198-207页

作者： Xiao-Han Zhang Shen-Quan Liu School of Mathematics South China University of Technology Guangzhou 510640 China

The phenomenon of stochastic resonance and synchronization on some complex neuronal networks have been investigated *** studies are of great significance for us to understand the weak signal detection and information transmission in neural ***,the complex electrical activities of a cell can induce time-varying electromagnetic fields,of which the internal fluctuation can change collective electrical activities of neuronal ***,in the past there have been a few corresponding research papers on the influence of the electromagnetic induction among neurons on the collective dynamics of the complex ***,modeling each node by imposing electromagnetic radiation on the networks and investigating stochastic resonance in a hybrid network can extend the interest of the work to the understanding of these network *** this paper,we construct a small-world network consisting of excitatory neurons and inhibitory neurons,in which the effect of electromagnetic induction that is considered by using magnetic flow and the modulation of magnetic flow on membrane potential is described by using memristor *** to our proposed network model,we investigate the effect of induced electric field generated by magnetic stimulation on the transition of bursting phase synchronization of neuronal system under electromagnetic *** is shown that the intensity and frequency of the electric field can induce the transition of the network bursting phase ***,we also analyze the effect of magnetic flow on the detection of weak signals and stochastic resonance by introducing a subthreshold pacemaker into a single cell of the network and we find that there is an optimal electromagnetic radiation intensity,where the phenomenon of stochastic resonance occurs and the degree of response to the weak signal is *** results show that the extension of the subthreshold pacemaker in the network also depe

关键词： electromagnetic induction synchronization stochastic resonance small-world network

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Control of epileptic activities in a cortex network of multiple coupled neural populations under electromagnetic induction

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Applied Mathematics and Mechanics(English Edition) 2023年第3期44卷 499-514页

作者： Zhongkui SUN Yuanyuan LIU Xiaoli YANG Wei XU School of Mathematics and Statistics Northwestern Polytechnical UniversityXi’an 710129China School of Mathematics and Statistics Shaanxi Normal UniversityXi’an 710062China

Epilepsy is believed to be associated with the abnormal synchronous neuronal activity in the brain,which results from large groups or circuits of *** this paper,we choose to focus on the temporal lobe epilepsy,and establish a cortex network of multiple coupled neural populations to explore the epileptic activities under electromagnetic *** demonstrate that the epileptic activities can be controlled and modulated by electromagnetic induction and coupling among *** certain regions,these two types of control are observed to show exactly reverse *** results show that the strong electromagnetic induction is conducive to eliminating the epileptic *** coupling among regions has a conduction effect that the previous normal background activity of the region gives way to the epileptic discharge,owing to coupling with spike wave discharge ***,these results highlight the role of electromagnetic induction and coupling among the regions in controlling and modulating epileptic activities,and might provide novel insights into the treatments of epilepsy.

关键词： epilepsy electromagnetic induction multiple coupled neural population dynamical transition

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Quantitative Multi-Layer electromagnetic induction Inversion and Full-Waveform Inversion of Crosshole Ground Penetrating Radar Data

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Journal of Earth Science 2015年第6期26卷 844-850页

作者： Jan van der Kruk Nils Gueting Anja Klotzsche Guowei He Sebastian Rudolph Christian von Hebel Xi Yang Lutz Weihermüller Achim Mester Harry Vereecken Agrosphere (IBG-3) Forschungszentrum Jülich GmbH Centre for High-Performance Scientific Computing in Terrestrial Systems (TerrSys) British Geological Survey Environmenal Science Centre Key Worth Electronic Systems (ZEA-2) Forschungszentrum Jülich GmbH

Due to the recent system developments for the electromagnetic characterization of the subsurface, fast and easy acquisition is made feasible due to the fast measurement speed, easy coupling with GPS systems, and the availability of multi-channel electromagnetic induction（EMI） and ground penetrating radar（GPR） systems. Moreover, the increasing computer power enables the use of accurate forward modeling programs in advanced inversion algorithms where no approximations are used and the full information content of the measured data can be exploited. Here, recent developments of large-scale quantitative EMI inversion and full-waveform GPR inversion are discussed that yield higher resolution of quantitative medium properties compared to conventional approaches. In both cases a detailed forward model is used in the inversion procedure that is based on Maxwell＇s equations. The multi-channel EMI data that have different sensing depths for the different source-receiver offset are calibrated using a short electrical resistivity tomography（ERT） calibration line which makes it possible to invert for electrical conductivity changes with depth over large areas. The crosshole GPR full-waveform inversion yields significant higher resolution of the permittivity and conductivity images compared to ray-based inversion results.

关键词： ground penetrating radar electromagnetic induction full-waveform inversion.

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Crustal and Upper Mantle Research in Pannonian Basin by electromagnetic induction:A Review

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Journal of Earth Science 1992年第1期11卷 96-108页

作者： Adam A.Sopron , Hungary

The review paper summarizes the main results of the electromagnetic induction studies carried out in the Pannonian Basin and Carpathians during the last 30 years . The following conducting formations are discussed in detail : (1)Crustal conductors in the crystalline basement of the sedimentary basin mainly due to graphitic schist blocks clearly connected to the fracture tectonics of the area ; (2 ) Conducting layer in the lower crust probably due to free fluid deliberated by the dehydration process at temperature of 300-400℃during metamorphism ; (3 ) Conducting asthenosphere due to partial melting at the bottom of the lithosphere ; and (4) Conductivity increases due to olivine-spinel phase transition .All of these phenomena are strongly related to the special thermal state and tectonics of the Pannonian Basin and Carpathians.

关键词： crustal conductor asthenosphere resistivity electromagnetic induction Pannonian Basin and Carpathians.

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Physical Interpretation of Electricity and Magnetism and electromagnetic induction

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Journal of Applied Mathematics and Physics 2023年第7期11卷 2069-2092页

作者： Weihong Qian School of Physics Peking University Beijing China Guangzhou Institute of Tropical and Marine Meteorology China Meteorological Administration Guangzhou China

Electricity and magnetism and electromagnetic induction are phenomena that can be perceived by people. But their interpretation and theoretical study took a long time. The theoretical research on electricity began with the discovery of Coulomb’s law in 1785, while the theoretical research on magnetism began with the discovery of Oersted’s Law in 1820. From the 1850s to the 1870s, Maxwell summarized a set of theoretical equations for electromagnetism based on some laws of predecessors. However, this set of equations contains a few statistical relationships and empirical concepts, so it is difficult to explain the physical nature of electromagnetic phenomena and principles. This paper explained that the macro phenomenon of electricity is the separation of unlike charges of new electrons produced by the orthogonal collision of old particles under the action of external forces. The physical nature of magnetism is the potential energy (magnetic energy) and information associated with the overall orientation of the moving electrons solidly recorded in the material. The physical principle of electromagnetic induction describes how change in electric current intensity generates change in magnetic intensity and vice versa through orthogonal interaction of ordered electrons. This theoretical interpretation does not require the concepts of traditional electromagnetic forces, electromagnetic fields, magnetic moments, and magnetic domains.

关键词： Electricity Magnetism Physical Interpretation Orthotropic Collision Unlike Charge electromagnetic induction

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Quantitative Evaluation and Uncertainty Assessment on Geostatistical Simulation of Soil Salinity Using electromagnetic induction Technique

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Journal of Environmental Protection 2016年第6期7卷 844-854页

作者： Haijiang Wang Shaotin Ren Zhexia Hao Li Meng Wei Wei Cui Jing The Key Laboratory of Oasis Ecological Agriculture Xinjiang Production and Construction Group/College of Agriculture Shihezi University Shihezi China

Diagnosis of soil salinity and characterizing its spatial variability both vertically and horizontally are needed to establish control measures in irrigated agriculture. In this regard, it is essential that salinity development in varying soil depths be known temporally and spatially. Apparent soil electrical conductivity, measured by electromagnetic induction instruments, has been widely used as an auxiliary variable to estimate spatial distribution of field soil salinity. The main objectives of this paper were adopted a mobile electromagnetic induction (EMI) system to perform field electromagnetic (EM) survey in different soil layers, to evaluate the uncertainty through Inverse Distance Weighted (IDW) and Ordinary Kriging (OK) methods, and to determine which algorithm is more reliable for the local and spatial uncertainty assessment. Results showed that EM38 data from apparent soil electrical conductivity are highly correlated with salinity, more accurate for estimating salinity from multiple linear regression models, which the correlation coefficient of 0 - 20, 20 - 40, 40 - 60 and 60 - 80 cm were 0.9090, 0.9228, 0.896 and 0.9085 respectively. The comparison showed that the prediction accuracy of two methods also displays good performance for soil salinity, the estimation precision of IDW method (with E = 0.8873, 0.9075, 0.8483 and 0.901, RPD = 9.64, 8.01, 8.17 and 11.23 in 0 - 20, 20 - 40. 40 - 60 and 60 - 80 cm soil layers, respectively) was superior to that of OK (with E = 0.8857, 0.872, 0.8744 and 0.8822, RPD = 9.44, 7.83, 8.52 and 10.88, respectively), but differences of two methods in predictions are not significant. The obtained salinity map was helpful to display the spatial patterns of soil salinity and monitor and evaluate the management of salinity.

关键词： Soil Salinity Spatial Distribution electromagnetic induction IDW OK

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Assessment and application of electromagnetic induction method to measure Arctic sea ice thickness

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Advances in Polar Science 2015年第4期26卷 292-298页

作者： GUO Jingxue WANG Huajun SUN Bo Polar Glaciology Division Polar Research Institute of China School of Earth Sciences Zhejiang University

The electromagnetic induction method is widely used to measure sea ice thickness. Based on the electrical properties of sea ice and seawater, the method measures the apparent conductivity, which represents the conductivity of the half-space, and calculates the thickness of the sea ice. During the fourth Chinese National Arctic Research Expedition in summer 2010, an integrated electromagnetic induction system was set up on the icebreaker R/V XUE LONG to measure sea ice thickness along the ship＇s tracks to the north of the Chukchi Sea. The conductivities of sea ice, seawater, and brine were measured and a simple forward model was used to explain the effect of changes in those conductivities on the apparent conductivity over a horizontal layered structure. The results of this analysis indicated that when using the electromagnetic induction method to measure sea ice thickness, the conductivity of sea ice could be neglected and the conductivity of seawater could be treated as a constant. The ice distribution results derived from the electromagnetic induction method showed that the typical sea ice thickness was 160 cm and 90 cm during the outbound and the return legs of the voyage, respectively.

关键词： sea ice thickness electromagnetic induction forward calculation conductivity Arctic

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Spontaneous electromagnetic induction modulating neuronal dynamical response

Spontaneous electromagnetic induction modulating neuronal dy...

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第四届全国神经动力学学术会议

作者：王荣 Ying Wu School of Science Xi'an University of Science and Technology State Key Laboratory for Strength and Vibration of Mechanical Structures School o AerospaceXian Jiaotong University

The electric activities of neurons are generated by the ions flowing across the neuronal membrane and are crucial for encoding and transmitting neural information[1]. The transmembrane flow of ions inevitably produces the time-varying electric field as well as the magnetic flux according to the Maxwell electromagnetic induction theorem[2]. This spontaneous electromagnetic induction is believed to reflect the memory effect of neural system and significantly modulates the neural information transmission[3], but its fundamental effect on the neuronal dynamical properties is still not well understood. In this paper, we used the meristor to coupling the neuronal electric field and magnetic flux and study how the spontaneous electromagnetic induction modulates the dynamical response properties of single FitzHugh–Nagumo neuron. It is found that the negative feedback of electromagnetic induction on the neuron significantly inhibits the dynamical response region,decreases the oscillation amplitude and induces the higher firing frequency. Meanwhile, the memristor with suitable memory ability can induce two kinds of bistabilities, including a coexist of a stable limit cycle and fixed point, and a coexist of two stable limit cycles. More importantly, the electromagnetic induction with different electric deriving strengths promotes the neuron to oscillate with single, double and multiple frequencies, respectively. Our results not only further confirm the efficacy of spontaneous electromagnetic induction in modulating the dynamic properties of the neuron, but also provide insights into the possibilities for choosing suitable parameter space while studying the effect of external magnetic induction on the brain functions.

关键词： Neuron electromagnetic induction Bifurcation Memristor

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