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Effect of Dry–Wet Cycling on the Residual Strength Characteristics of Coal Measure Soil
Gang Huang,Mingxin Zheng 대한토목학회 2021 KSCE JOURNAL OF CIVIL ENGINEERING Vol.25 No.11
Coal measure soils are the main component in the slip zones of landslides along the Changli highway in China. Therefore, exploring the residual strength of coal measure soil affected by dry–wet cycling is helpful for evaluating landslides. However, very few researchers have reported on the residual strength behavior of coal measure soil subjected to dry–wet cycling. In this study, we performed three tests (ring shear test, scanning electron microscopy test, and mercury intrusion porosimetry test) to evaluate the residual strength behavior of coal measure soil under different dry–wet cycles. Our results indicated that the peak strength decreased with increasing dry–wet numbers and that dry–wet cycling had no evident effect on the residual strength. Moreover, the residual strength in the slip soil was approximately proportional to the normal stress. Furthermore, the degeneration of peak cohesion exponentially increased, and the porosity and fractal diameter also increased with the dry–wet numbers. The connection between mineral particles changed from a stable layered structure to an unstable chain structure. Consequently, we inferred the failure mechanism of K213-type shallow landslides and formulated appropriate preventive measures. This study is of great significance for understanding the mechanical behavior of the slip zone of coal measure soil and predicting the re-emergence of coal measure soil landslides.
Mingzhu Chi,Pingyun Zheng,Mingxin Wei,Aimei Zhu,Lubin Zhong,Qiugen Zhang,Qinglin Liu 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.115 No.-
The traditional polyamide composite nanofiltration membrane has high selectivity. However, low waterpermeability is an important problem to be solved. Herein, the conventional polyamide compositenanofiltration (TFC) membrane was modified with nanoporous TiO2 (nTiO2) interlayer throughvacuum-assisted strategy for enhanced water permeability. By tuning the nTiO2 nanoparticles loading,the nTiO2 modified TFC membrane with crumpled structure was fabricated. Besides, the thickness ofpolyamide layer was reduced due to the hydrophilicity and porosity of nTiO2. Because of the larger effectivefiltration area and thinner polyamide layer, the modified membrane had a permeability of12.8 L m2 h1 bar1 (increased by 20.8% than that of TFC membrane) and a rejection of 98.2% when filteringNa2SO4 aqueous solution. This work provided a solution for enhanced water permeability andextended the application of TiO2 in the modification of polyamide composite nanofiltration membrane.
Collision-Free Adaptive Control for UAV Formation with Input Saturation and Communication Delays
Jianhui Lu,Fan Luo,Zhong Zheng,Mingxin Hou,Lin Wang 한국항공우주학회 2022 International Journal of Aeronautical and Space Sc Vol.23 No.3
This paper addresses the collision-free adaptive formation control problem for multiple unmanned aerial vehicles subject to input saturation and communication delays. First, a novel collision-free adaptive saturated control scheme is proposed using potential function and anti-windup compensator approaches. It shows that the velocity consensus and collision avoidance are realized when the directed communication topology is strongly connected. Second, the collision-free adaptive saturated control algorithm is proposed considering communication delays and collision avoidance, and it enables the asymptotic stability of the closed-loop system when the time-varying communication delays are decreasing to zero eventually. Finally, numerical simulations demonstrate that the proposed control approaches are effective, while the objectives of collision avoidance and velocity consensus are fulfilled.