Abstract.High temperatures during fires pose a serious threat to the safety of building structures, significantly degrading the mechanical properties of construction materials and potentially triggering major accidents. Elevated thermal exposure reduces the mechanical performance of reinforced concrete (RC) elements, substantially undermining their overall behavior. Moreover, under high-temperature conditions, the epoxy-based bond between carbon fiber fabric and the concrete substrate undergoes pronounced thermal degradation, placing unprotected, strengthened structures at significant risk of … Read more →

Abstract.Wireless power transfer (WPT) is a promising charging technology for electric vehicles (EVs). However, electromagnetic exposure and leakage fields raise safety and efficiency concerns. This paper establishes an EV-WPT system model and applies ferrite-based magnetic shielding to reduce leakage fields. A Grey Wolf Optimization (GWO) algorithm is introduced to optimize ferrite design parameters. Simulation results show that ferrite shielding reduces magnetic induction intensity by 27% and improves transmission efficiency from 91.3% to 93.5%, confirming the effectiveness of the proposed … Read more →

Abstract.This paper investigates the significant impact of seismic events on critical urban infrastructure components, including bridges, road networks, and water supply systems. Through detailed case studies and rigorous theoretical analysis, it examines the mechanisms of earthquake-induced damage and consequent service disruptions. The study further conducts an in-depth analysis to identify effective mitigation strategies, culminating in a series of targeted recommendations for enhanced seismic design principles. These proposed measures aim to significantly reduce structural damage, minimize … Read more →

Abstract.This article uses Fluent simulation software to establish a three-dimensional steady-state model of MHPA-PVIT, and verifies the reliability of the model. The simulation results are in good agreement with the experimental results. Taking into account thermal efficiency, electrical efficiency, and losses caused by increasing flow rate, the optimal operating flow rate for MHPA-PVT components should be 0.15 kg/(m2 · s). The thermal efficiency decreases with increasing wind speed, while the electrical efficiency increases with increasing wind speed. And when the inlet temperature is low, the … Read more →

Abstract.As the key force transmission component of deep foundation pit support system, fish-bellied steel purlin is widely used in the field of civil engineering due to its advantages of light weight, high strength, convenient construction and reusability. This paper systematically reviews the research progress of fish-bellied steel purlins in structural static performance ( bearing capacity, stability ), joint mechanical behavior, dynamic response characteristics, construction process simulation and design methods. The analysis shows that the current research focuses on numerical simulation and scale … Read more →

Abstract.Aiming at the serious surrounding rock deformation at the T-junction of S2303 auxiliary entry and south wing auxiliary transport main roadway in Gucheng Coal Mine, a combination of on-site observation, numerical simulation and on-site industrial test was adopted to comprehensively reveal the deformation and failure characteristics of the intersection and propose effective control technologies. The results show that the main reasons for the surrounding rock deformation at the intersection are the large burial depth of the roadway, the superimposed stress caused by the cross distribution of … Read more →

Abstract.To reduce the risk of construction safety in high-rise buildings, we first analyze the types of safety accidents that exist in high-rise building construction. By introducing the basic principles of disaster sociology, we discuss and analyze from four aspects: disaster and society, disaster culture, disaster psychology, disaster behavior, This leads to the identification of risk factors for high-rise building construction safety from the perspective of disaster sociology, enriching the selection of indicators for risk assessment of high-rise building construction safety. Read more →

Abstract.Small centrifugal fans are the core components in quick-freezing refrigeration equipment. They operate through a process where an electric motor drives the impeller to rotate, converting mechanical energy into potential energy. This paper first calculates the range of blade quantities using theoretical formulas for blade number selection, then simulates the working state of small centrifugal fans using ANSYS Workbench. Finally, it compares and analyzes parameters such as pressure, flow rate, torque, and efficiency of centrifugal fans with different numbers of blades. By first calculating the … Read more →

Abstract.The construction of long and large-scale mountain tunnels represents a pivotal component in highway infrastructure, where site selection plays a decisive role in ensuring both construction safety and long-term operational stability. Nonetheless, factors such as intricate geological conditions, environmentally sensitive terrains, and fluctuating economic contexts introduce considerable uncertainty into the decision-making process. To tackle these complexities, this study proposes a structured multi-criteria evaluation framework by establishing a targeted indicator system for tunnel siting in … Read more →

Abstract.As China's offshore wind power develops into deep and distant sea and large scale, the problems of power abandonment, consumption and energy storage are highlighted, and the traditional grid-connected mode causes energy waste. This work is based on palladium (Pd) catalyst hydrogen-ammonia coupling system, through the "on-site hydrogen synthesis ammonia", to realize the conversion of abandoned power and green hydrogen storage and transportation, to develop a new path of new energy utilization. The system integrates PEM water electrolysis to produce hydrogen and Pd catalyzed nitrogen reduction … Read more →

Abstract.Cross fractures are commonly found in natural rock masses and typically exhibit primary and secondary classifications, with their geometric characteristics significantly influencing the stability of rock engineering. This study calibrates the mesoscopic parameters of PFC2D through sandstone laboratory tests and systematically investigates the effects of orthogonal fracture inclination angle and primary and secondary fracture lengths on the mechanical properties and damage evolution of sandstone. The results indicate that the peak stress and peak strain initially decrease and subsequently … Read more →

Abstract.Due to the widespread heterogeneity in oil reservoirs and severe water channeling, hydrogel-based agents are employed for profile control and water plugging. Amphiphilic polymers exhibit superior temperature and salt tolerance, and gels formed with these polymers as the primary agent demonstrate enhanced stability, showing broad application prospects. The ternary copolymer P(AM-NaA-ODAM) was synthesized via free-radical solution polymerization, with structural characterization of the product and related monomers performed using infrared spectroscopy. Leveraging the excellent properties of the … Read more →

Abstract.To address the problem of degraded shallow imaging quality caused by source–receiver offset variations in coalbed methane (CBM) exploration in Shanxi Province, this study applies the five-dimensional interpolation technique in the OVT (Offset Vector Tile) domain. By regularizing seismic data, this method effectively mitigates the uneven distribution of offsets induced by large source–receiver deviations due to surface obstacles. Shanxi Province is characterized by well-developed coal-bearing strata and abundant CBM resources. In recent years, as seismic exploration has penetrated deeper, the … Read more →