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Aiming at the problems of large number of traversal nodes, large turning angle, and slow search speed of the traditional A* algorithm, a multi-scene adaptive improvement A* algorithm based on fitting-first search is proposed. Firstly, the heuristic distance of the parent node is introduced to reduce the number of traversal nodes and improve the search speed, the scene map information is quantified, and the adaptive control principle is used to achieve the timely adjustment of the heuristic weight to enhance the robustness of the algorithm. Secondly, the heuristic strategy of fitting-first search is used to further enhance the heuristic of the algorithm. Thirdly, the path is smoothed through local pruning and redundant node deletion to reduce the number of traversed nodes and the turning angle. Finally, a simulation test is carried out on Matlab, and the test results show that the proposed algorithm has fewer traversed nodes, smaller turning angle, and faster search speed. [ABSTRACT FROM AUTHOR]

In order to solve the Yi Lan open-pit mining sequence optimization of western oversizing mining， based on the improved analytic hierarchy process and method of fuzzy comprehensive evaluation, this paper established the improved AHP- fuzzy comprehensive evaluation model of comprehensive evaluation index system, and optimized the 3 kinds of mining procedure schemes for alternative. Considering the 2 aspects of the geological and topographical conditions and the technical conditions of production, the evaluation indexes related to the mining procedures are comprehensively evaluated. 3D geological solid model and simulated mining technology was used to calculate the corresponding quantities and determine the parameter values, and the weight vectors of each evaluation index are objectively determined by the Three-demarcation Method. Then, combining with the principle of fuzzy comprehensive evaluation method, the improved AHP- fuzzy comprehensive evaluation index system model is constructed, and calculated the comprehensive evaluation values of 3 mining program schemes based on evaluation indexes. The results show that the evaluation values of the three schemes are 59.77, 49.35, and 56.08, and the first scheme (cross mining and inner dumping) is optimal. The improved AHP- fuzzy comprehensive evaluation method is feasible and effective for the optimization of open pit mining. [ABSTRACT FROM AUTHOR]

Accurately simulating the airflow field at tower-line height of large field space in hilly and gully areas is key to studying the wind-induced vibration response and mechanical characteristics of high-voltage transmission lines and optimizing the tower-line coupling structure design, based on the relevant theory of computational fluid dynamics. However, due to the lack of systematic research on boundary effects, the simulation results of the flow field are not accurate or the model boundaries are excessively redundant and difficult to solve. In order to address this challenge, a typical region was modeled based on DEM data, and the influence of modeling methods and boundary effects on flow field simulation at specific height layers in complex terrain was systematically discussed through flow field simulation and boundary effect analysis. The results indicate that when the height of the calculation domain exceeds seven times the terrain height difference, the boundary effect is essentially eliminated. Furthermore, the distortion of the flow field caused by wall boundary constraints decreases as the redundant distance increases, with a redundant distance of 700 m being able to obtain a more stable wind field. It is concluded that the study effectively elucidates the impact of the calculation domain on the flow field and presents a method to mitigate the boundary effect of the fluid model. These findings hold valuable reference value for enhancing the stability and wind resistance of high-voltage transmission line structures. [ABSTRACT FROM AUTHOR]

Degradable magnetic and CO2 dual-responsive microgels were prepared by inverse suspension polymerization and in-situ synthesis of nanoparticles. The structure and morphology of microgels were characterized by Fourier-transformed infrared (FT-IR) spectroscopy, scanning electron microscope (SEM) and transmission electron microscope (TEM). The microgels exhibited magnetic and CO2 responsiveness, and could be degraded upon the treatment of D, L-dithiothreitol (DTT). After treating with the stimulus of CO2, the microgels exhibited a selective adsorption for anionic dyes. The maximum adsorption capacity was up to 1413 mg/g for Alizarin red (AR). The microgels with adsorbates could be separated from solutions under the help of an external magnetic field. Besides, the adsorbates could be described by treating with solution of pH 12. Microgels regenerated with CO2 trigger exhibited high adsorption ability (>90%) after three consecutive recycling trials. [ABSTRACT FROM AUTHOR]

In order to optimize the mining boundary of the narrow and long strip open-pit using the cross exploitation and inner dumping mining procedure in inclined coal seam optimization,a method to optimize the state in different periods is proposed,based on the principle of open-pit mining.Based on the changes of stripping logistic flow,the mining operation is divided into three periods,namely outside dumping,partial inside dumping,and inside dumping.Through the construction of location model related to each period of stripping,mining,and dumping,the authors analyzed the effect in the mining process from stripping logistic flow on the economic stripping ratio in different periods,revealed the relationship between the economic reasonable stripping ratio and the progress of the internal dumping line,constructed the fitting function of coal seam and rock wall thickness,explained the method of determining the optimal wall position of the profile by using the method of cyclic judgment,then the principle,application condition and optimization model of stage boundary optimization are given.This method is applied to the Shenxin Energy God Montenegro open-pit mine,and the result shows that the economic stripping ratio increased from 8.06 m3/t to 10.54 m3/t gradually.Compared with the original design,the level of economic recoverable reserves increased by 44.95 Mt and the service life increased by 4.26 a,achieving the maximum economic benefit of open-pit mining. [ABSTRACT FROM AUTHOR]