Abstract.Aiming at the outstanding problems of difficult deformation control and poor stability of surrounding rock in super large section roadway of coal mine, the mechanical mechanism of deformation and failure of surrounding rock in super large section roadway is systematically analyzed, and the typical failure modes such as roof bending settlement, high side wall buckling instability and strong floor heave are expounded. According to its failure characteristics, a comprehensive control technology system with the core of ' step-by-step excavation pressure relief, active coupling support and overall … Read more →

Abstract.Focusing on the design contradictions in the design of unmanned intelligent harvesters, such as the integration of functions and the overall appearance, the perception of technological sense and reliability, this paper explores the application methods of TRIZ contradiction matrix theory in the field of agricultural machinery appearance design. Based on the TRIZ conflict matrix theory, the subjective judgments in the industrial design of unmanned harvesters are transformed into quantifiable contradiction parameters, and the contradiction parameters and resolution principles suitable for the … Read more →

Abstract.Frost heave and thaw settlement are core problems restricting the construction and safe operation of infrastructure in cold regions. This phenomenon widely exists in seasonal frozen soil and permafrost regions, which will lead to uneven deformation of engineering structures, cracks, and even safety accidents. Based on the systematic analysis of the physical process of frost heave and thaw settlement, this paper expounds the development of classical theories such as capillary theory and frozen fringe theory, and discusses the key influencing factors including soil properties, water content, … Read more →

Abstract.This paper systematically investigates airborne time and frequency synchronization technologies, overall system architectures and major technical challenges under complex and harsh aerospace environments. It analyzes feasible synchronization methods including satellite timing and two-way time comparison, presents two typical system architectures, elaborates on core critical technologies, discusses future development trends, and verifies the synchronization precision and operational reliability of relevant equipment, providing solid technical support for stable operation of avionic systems and … Read more →

Abstract.In practical engineering applications, time delays are inherent in neural networks due to signal transmission lags, hardware response limits and network communication constraints, which may induce oscillation, chaos and even system instability. Meanwhile, limited measurable outputs and external noise make it impossible to obtain full neuron states directly, so state estimation has become an indispensable technique. However, traditional time-triggered transmission leads to massive redundant data and unnecessary communication consumption. Event-triggered mechanism (ETM) transmits data only when … Read more →

Abstract.With the advancement of industrialization, industrial water use efficiency has become a core issue in global water resources management and sustainable development. Evaluation of industrial water use efficiency in China involves multiple dimensions, among which single-index method and multi-index system method are the most commonly used. This paper compared the industrial water use efficiency of Jiangsu and Shandong provinces, adopted the single-index method for calculation and analysis, and assessed the applicability of different single indices in reflecting regional industrial water use … Read more →

Abstract.Due to the significant scale variations and dense distribution of small objects commonly present in imagery captured by unmanned aerial vehicles (UAV), traditional object detection algorithms often suffer from missed detections and false positives in such scenarios. To address these challenges, we propose a novel detection framework—MSG-DETR, specifically designed for small object detection in aerial images captured by UAV. First, we design a lightweight multi-scale feature fusion backbone, MSFFNet, which enhances the extraction of small object features while significantly reducing … Read more →

Abstract.This study takes Shenzhen, a core city in the Guangdong-Hong Kong-Macao Greater Bay Area, as the research focus. Ten typical urban rail transit stations, including Shenzhen North Station and Buji Station, are selected. Using a combination of field surveys, questionnaire surveys, and in-depth interviews, the study systematically analyses the actual difficulties faced by people with disabilities and the elderly when using rail transit, and evaluates the effectiveness and shortcomings of barrier-free environment construction. The findings indicate that while some stations have made notable … Read more →

Abstract.To mitigate the impact of uncoordinated charging of electric vehicle (EV) clusters on grid load and improve wind power accommodation, this paper proposes an ordered charging scheduling strategy for EVs considering wind power consumption. First, a charging load model for EVs is established, and the impact of uncoordinated charging of EV clusters of different scales on grid load is analyzed. Second, an ordered charging control model for EV clusters is developed, and a time-of-use (TOU) electricity price strategy based on grid-connected wind power output is proposed to effectively regulate the … Read more →

Abstract.As one of the most widely used structural materials in modern society, the optimization and improvement of concrete performance has always been a hot topic in material science research. As a non-destructive analysis method, nuclear magnetic resonance ( NMR ) technology has shown unique advantages in the study of concrete materials because it can provide material microstructure and dynamic information. This paper reviews the application of nuclear magnetic resonance technology in the hydration process, pore structure analysis and durability evaluation of concrete materials, and discusses the … Read more →

Abstract.Accurate assessment of soybean seedling uniformity is essential for evaluating sowing quality and guiding early-stage field management, yet conventional manual inspection remains subjective and inefficient. This study presents a quantitative uniformity assessment framework based on multi-feature fusion using high-resolution RGB images. Per-plant masks and spatial positions are obtained through instance segmentation of soybean seedling images. Five categories of plot-level uniformity features are then extracted—emergence rate, plant spacing, inter-row angle, canopy coverage, and evenness … Read more →

Abstract.Marine electric propulsion system is a core technology at the intersection of shipping low-carbonization, ship intellectualization and comprehensive electrification. Compared with traditional mechanical propulsion, electric propulsion is not a simple replacement of diesel engines with electric motors. Instead, it takes generator sets, energy storage devices, fuel cells, shore power interfaces, ship power grids, power electronic converters, propulsion motors, propellers/podded thrusters and energy management systems as the core, forming a ship integrated energy system with multi-energy sources, … Read more →

Abstract.Conventional Coulomb transfer only considers the triggering effect of moderate and strong earthquakes, ignoring that every earthquake has the ability of self-triggering. Statistical model, epidemic aftershock sequence model (ETAS), represents the normal seismic activity in a region. The quietness and activity of seismic activity can be detected by the systematic deviation between seismic activity and prediction rate, which can be regarded as the trigger effect of previous events and has a strong correlation with the coseismic trigger of Coulomb fracture stress change caused by strong … Read more →

Abstract.The Altai region of Xinjiang represents one of the most significant gold metallogenic belts in China. In recent years, an increasing number of gold deposits have been identified as intimately associated with intermediate-acidic intrusive rocks, particularly granites. The Altai region extensively exposes multi-episodic, multi-source granitic plutons exhibiting distinct spatiotemporal distribution characteristics, which are closely related to gold mineralization. Based on a systematic review of previous research findings, combined with the orogeny, magmatism, and tectonism of the Altai orogenic … Read more →

Abstract.In this paper, CdS/SnO2 heterojunction photocatalysts with different CdS composite ratios were prepared via a hydrothermal method. Their phase structure, microstructure, specific surface area, surface chemical state, optical properties, and photocatalytic performance were systematically investigated. XRD results indicate that CdS and SnO2 coexist in the form of a physical heterointerface without lattice doping or distortion. TEM/HRTEM and EDS analyses show that SnO2 nanoparticles are uniformly dispersed on the surface of the CdS plate-like structure, forming a closely contacted heterointerface … Read more →

Abstract.To address the issues of large fluctuations in influent load, high aeration energy consumption caused by conservative traditional on-off control strategies, unstable dissolved oxygen (DO) concentration, and poor sensor reliability in the activated sludge wastewater treatment process, a Model Predictive Control (MPC) method integrating data quality monitoring and a feedforward disturbance mechanism is proposed. A multi-input multi-output prediction framework based on an incremental Auto-Regressive eXogenous (ARX) model is constructed. The influent disturbance observer (BOD) load is introduced … Read more →