Filling mining is one of the feasible methods to prevent rock burst in coal mining, which a research significance topic field. In this paper, we first described filling effect based on “equivalent height” and analyzed evolution overlying strata. It was found that time‐space hysteresis occurred during movement strata filled working face. On basis, mechanical relationship dynamic transformation among “filling rate–strata movement–abutment stress” obtained by analyzing stress characteristics....

By installing FBG sensors on the geogrids, smart geogrids can both reinforce and monitor stability for geogrid-reinforced slopes. In this paper, a sand slope model test is conducted in laboratory fiber Bragg grating (FBG) sensing technology used to measure strain distribution of geogrid. Based test, performance reinforced soil simulated by finite element software Midas-GTS, analyzed strength reduction method. The relationship between geogrid factor safety set up. results indicate that...

The sudden outbreak of the novel coronavirus pandemic in 2019 disrupted normal order life and work, virus is still a major threat prevailing globe. Confronted with unknown virus, citizens have been following government policies COVID-19 treatment containment, actively improving their immunity through physical activity (PA). This paper concerned ways to guide or promote people's willingness exercise, one most effective means boost immunity. Based on "attitude-intention" correlation defined...

The creep deformation behaviour of thermo-mechanically treated Al x CrMnFeCoNi high-entropy alloys was investigated in the high-temperature range 600–700°C. Compared with Al-free alloy, showed higher resistance under same conditions due to strengthening contribution from elemental Al. 0.4 alloy exhibited a stress-dependent transition low-stress region high-stress region. 0.6 decreased compared which ascribed activation volume and stacking-fault energy former alloy. Specifically,...

As the typical particle-reinforced aluminum matrix composite, SiCp/Al composite has low density, high elastic modulus and thermal conductivity, is one of most competitive metal composites. Grinding main processing technique energy consumption grinding process provides guidance for saving, which aim green manufacturing. In this paper, experiments were designed conducted to obtain machine tool. The Particle Swarm Optimization (PSO) BP neural network prediction model was applied in grinding. It...

By installing FBG sensors on the geogrids, smart geogrids can both reinforce and monitor stability for geogrid-reinforced slopes. In this paper, a sand slope model test was conducted in laboratory fiber Bragg grating (FBG) sensing technology is used to measure strain distribution of geogrid. Based test, performance reinforced soil simulated by finite element software Midas-GTS, analyzed strength reduction method. The relationship between geogrid safety factor set up. results indicate that...

High volume fraction SiCp/Al composite is an important particle reinforced material, which widely used in the aerospace and automotive fields. Drilling a common processing method of composite. It great significance to study prediction drilling force improve efficiency optimize parameters. In this paper, high-volume experiment was designed obtain at different drill rotational speed feed rate. The improved BP neural network algorithm predict force. result shows that predicted based on...

The impact risk evaluation for the strip filling of working faces has always been a research hotspot and difficulty in field rock bursts. In this paper, concept critical rate is first proposed, criterion identifying face established. Then, membership function coal body stress seam elastic energy index to was established, classification grade formed. On basis, overall local method burst hazard proposed. Finally, C8301 Yunhe mine taken as engineering background, carried out. It found that...

At the onset of 2019 coronavirus (COVID-19) pandemic, China effectively reduced risk a major outbreak through measures such as lockdown, quarantine and closure, which also brought country to standstill with normal social operations largely becoming stagnant, including suspension production, schools business. In active response this non-normality, nation has resorted various apps promptly restore operations, forming new norm 'offline life' supplementary 'online life'. Although variety...

Rapidly changing digital technologies are reconfiguring the way human society lives, indicating that more and middle-aged older adults will lead a life in future. Whether technology for today can effectively improve quality of this cohort is focus study. This study proposed “cognitive–emotional–behavioral” model situated use Extreme Edition App as cross-sectional research object. The also explored relationship between adults’ perceptions benefits cash subsidies, pleasure worry generated by...

This paper presents research on a new high-efficiency, non-circular spinning method based hypocycloid theory. The trajectory of the roller during forming process was derived, and simulated in ABAQUS 2016/Explicit. distribution von Mises stresses equivalent plastic strains after each pass were analyzed. quality also investigated. proves feasibility workpieces cross-section using can be used practice to produce with specific geometry increase rotational speed workpiece from 60–240 rpm 600 rpm,...

Layered fracture frequently occurs in the deforming process of QStE700 medium-thickness steel plates under tensile loading. In this study, morphology a layered was observed via scanning electron microscopy, and mechanism also analyzed. Based on three-dimensional digital image correlation technique, section analysis method adopted for determining true stress–strain curve including necking process. A modified Bridgeman’s equation to transform into equivalent curve. At time occurrence, strain...

The super-long bored pile has several characteristics of bearing capacity which is different from the common foundation due to large length-diameter ratio. This type mainly affected by ratio, length pile, beside soil piles, bottom and material construction technology. Different factors have various effects on its capacity, away a larger degree influence engineering. paper studied capability using grey relational analysis method, sorts factors. provided theory evidence for design in similar...

Abstract SiCp/Al is a kind of particle reinforced composites with good material properties, which can be used in the field lightweight parts and electronic packaging. Ultrasonic- assisted grinding process one processes suitable for machining hard brittle materials, surface quality improved by using appropriate ultrasonic-assisted parameters. In this paper, to improve SiCp/Al, meanwhile, kinematics abrasive particles analysed explain effect ultrasonic vibration. addition, experiment...