Recently, several UHV transmission lines that have been operational for over 15 years, transmitting power from Yunnan and Guizhou to Guangdong Province, suffered severe damage to their tower foot due to soil corrosion. Consequently, this study conducted accelerated corrosion simulation research on the UHV transmission tower foot in a laboratory setting. The electrolytic corrosion acceleration simulation method and the dry and wet cycle acceleration simulation method were proposed as two approaches to simulate tower foot corrosion in this study. The corrosion morphology and products resulting from electrolytic and natural corrosion of the carbon steel substrate exhibited remarkable similarities. Notably, the acceleration ratio of electrolytic corrosion exceeded 100, thereby adhering to the fundamental principles and evaluation characteristics of accelerated corrosion. The experimental design involved a simulation test that replicated the on-site environmental conditions, specifically targeting the dry and wet cycles. This test effectively mimicked the corrosion process of metal surfaces and generated rust layers exhibiting similar characteristics to those observed in field corrosion. By conducting an analysis of the polarization curve for the rusted sample, a comparison was made regarding the corrosion rates observed in different sections of the tower foot. The outcomes obtained from AC impedance analysis revealed that soil corrosion predominantly relied on diffusion processes, thereby enabling us to derive equivalent circuitry and component parameters pertaining to carbon steel soil corrosion.

The exploration of lunar water resources has always been a cutting-edge topic in human space exploration. This paper presents a method for gas deposition and ice formation to simulate the mixture of ice and regolith in lunar polar shadowed regions. Following the principles of physical structure equivalence and environmental parameter approximation, based on the principle of water molecule deposition and adsorption in a cold trap environment, water ice is converted into water vapor by raising the temperature in a vacuum environment. Then, water molecules deposit and adsorb on the surface of dry, low-temperature mineral particles, forming an ice film under the action of the cold trap capture principle. The morphology and occurrence status of the particle surface ice film has been obtained through microscopic characterization of the samples in a cold environment. Vacuum pressure monitoring equipment is used to verify the pressure changes of water during the sublimation and deposition, and the phase diagram of water is analyzed to understand its state changes within the simulated setup. Samples are retrieved from a high-purity nitrogen glove box, and their water content is verified using thermogravimetric analysis (TGA). The effectiveness of the proposed lunar regolith simulation method is validated through macroscopic and microscopic approaches. This method provides high-fidelity samples for lunar water resource utilization, scientific exploration, and payload development on the Moon.

Traditional wooden structures are characterized by the presence of a column base that seems to be floated above the foundation stone. This study used pseudo-static experiments to assess the seismic performance of flat pendulum floating resting columns, focusing on the decay and repair of the wood frame (WF). First, an artificial method was used to simulate fungal decay damage of column-foot joints, and filling reinforcement was applied to the decayed column-foot joints, and second, according to the design method in the Sung dynasty architecture, the Ying-tsaofa-shih (building standards). This study presents the findings of pseudo-static tests that were conducted at Yangzhou University. Three 1:3.52 scaled specimen WFs with flat-pendulum-floating-shelf (FPFS)-typed (Ping-bai-fu-ge) columns, i.e., non-damaged WF (named after NT), considering the damaged WF (named after DF) and strengthening damaged WF (named after DR) with one-way straight mortise-tenon joints (OWSMT) joints were made and subjected to cyclic lateral loads during testing. The properties of the WFs with FPFS columns, such as the failure mode, hysteretic and envelope curves, strength and stiffness deterioration, and energy dissipation, have been studied. Finally, the effects of additional damage and reinforcement measures on the seismic performance of WFs are analyzed and compared with the finite element numerical simulation results. This research shows that damage to the column foot decreases the WF's seismic performance, although filler reinforcement may increase it. The foot and mortise joints are interconnected and interact in the wood frame's seismic stressing mechanism. Foot decay reduces the seismic performance of the foot joint, hence increasing the seismic energy dissipation activity of the mortise joints.