Article
Geochemistry & Geophysics
Yan Li, Chao Ma, Lianying Zhang, Bing Li
Summary: This study investigates the influence of softening and swelling of weakly cemented soft rock on the stability of roadway surrounding rock, and proposes a new support plan of grouting + anchor cable mesh + bottom arch. The results show that considering the softening and swelling of weakly cemented soft rock leads to increased displacement and plastic zone depth of the surrounding rock, resulting in instability and destruction. The adoption of the combined support plan effectively reduces the displacement and plastic zone depth of the surrounding rock, ensuring the stability of the roadway.
Article
Physics, Fluids & Plasmas
Tristan Auregan, Benjamin Thiria, Sylvain Courrech du Pont
Summary: Adding flexibility to rotating structures improves their efficiency, reliability, and compliance to external flow perturbations. In this study, we experimentally investigate a propulsive rotor submerged in water with flexible blades. We measure forces and blade deformations under rotation and incoming flow, demonstrating that moderate deformation slightly affects thrust production while strong deformation completely inhibits it. We also find that the blade bending angle can be predicted using a modified Cauchy number and that a single curve relates thrust to bending deformation.
PHYSICAL REVIEW FLUIDS
(2023)
Article
Engineering, Geological
Yifan Chen, Hang Lin, Rihong Cao, Chunyang Zhang
Summary: The study introduced the equivalent influence angle of slope theta(e), quantified the stability contributions of c and phi, and developed a modified double strength reduction method.
INTERNATIONAL JOURNAL OF GEOMECHANICS
(2021)
Article
Engineering, Environmental
Ying Li, Yunpeng Chen, Zhonglu Guo, Chengchun Tang, Baisheng Sa, Naihua Miao, Jian Zhou, Zhimei Sun
Summary: The group discovered that by substituting a series of TM atoms in Mo3C2 MXene, the catalytic performance of CO2RR can be significantly improved, allowing for the selective reduction of CO2 to methane (CH4) and effectively lowering the limiting potential of the reaction.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Chemistry, Physical
Dong-Gyu Lee, Su Hwan Kim, Hyun Ho Lee, Seokmin Shin, Jiyun Lee, Se Hun Joo, Yeongdae Lee, Sang Kyu Kwak, Hyun-Kon Song
Summary: Theoretical computational studies have suggested that the catalytic activity of a family of transition metal terephthalates (MTPs) as electrocatalysts can be significantly improved by using polypyrrole (pPy) as a proton donor, which breaks the linear scaling relationship (LSR) between adsorption energy levels of intermediates. Experimental and theoretical results demonstrate that pPy has a stronger impact on the adsorption energy of specific intermediates while affecting other intermediates less, resulting in improved oxygen reduction reaction (ORR) activity of MTPs and altering the activity volcano plot. The most significant improvement was observed on CoTP with a shifted onset potential towards the more easy-to-be-reduced direction.
Article
Environmental Sciences
Carine G. van der Boog, Henk A. Dijkstra, Julie D. Pietrzak, Caroline A. Katsman
Summary: An analysis of in-situ ocean observations revealed the occurrence of double-diffusive thermohaline staircases in specific regions of the global ocean. The combined contribution of double-diffusive fluxes to the global ocean's mechanical energy budget is small, but its regional impact, for example near Australia, could be important.
COMMUNICATIONS EARTH & ENVIRONMENT
(2021)
Article
Mechanics
Johannes Kalliauer, Herbert A. Mang
Summary: This paper provides a conditionally affirmative answer to the posed question using a mechanically objective arc-length as a tool. Numerical analysis shows the stiffening and softening of certain degrees of freedom in the investigated structure, and a global quantity is proposed as an alternative to stiffness.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2022)
Article
Chemistry, Physical
Eric J. Mcshane, Valerie A. Niemann, Peter Benedek, Xianbiao Fu, Adam C. Nielander, Ib Chorkendorff, Thomas F. Jaramillo, Matteo Cargnello
Summary: In this study, the quantitative analysis of lithium alkoxide solid-electrolyte interphase (SEI) species and its effect on the efficiency of lithium-mediated electrochemical ammonia synthesis were investigated. The results showed that the thickness of the lithium alkoxide SEI layer significantly influenced the Faradaic efficiency, with an optimal thickness of around 4 μm.
ACS ENERGY LETTERS
(2023)
Article
Chemistry, Physical
Qian-Tong Song, Zhi-Chao Huang-Fu, XiaoLin Liu, Yue Wang, YuHan He, ZhiYuan Yu, ChangYi Wang, Shi-Gang Sun, ZhaoHui Wang
Summary: In this study, the potential-dependent electrode SFG intensities of polycrystalline gold electrodes in HClO4 and H2SO4 electrolytes were analyzed, revealing that the EDL contributed about 30% SFG signal with specific adsorption in H2SO4. Below PZC, the total SFG intensity was dominated by the Au surface contribution and increased similarly in these two electrolytes. Above PZC, the EDL SFG contribution increased rapidly with potential in H2SO4.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Engineering, Electrical & Electronic
Yicong Chen, Guohua Zhai, Shuobo Wang, Jianjun Gao, Jishan Ren
Summary: This letter proposes a high-angle-stability dual-band single-layered linear-to-dual-circular polarization (LDCP) converter for K-/Ka-band SatCom. The unit cell consists of nonresonant meander lines and strips with identical shapes printed on both sides of the substrate, allowing efficient transformation from linear polarized waves to orthogonal circular polarized waves. The converter exhibits a high angle stability of +/- 45 degrees with a compact cell size of 0.17 x 0.19 lambda(0) (2). Experimental results show 3 dB AR bandwidths of 21.8% and 12.6% in the lower and upper bands, respectively, covering the two operating bands of K-/Ka-band SatCom well.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2023)
Article
Engineering, Civil
Laura Ragni, Fabio Micozzi, Enrico Tubaldi, Andrea Dall'Asta
Summary: This paper examines the nonlinear behavior of high-damping natural rubber (HDNR) bearings and their relationship with the seismic performance of isolated structures. An advanced model is used to analyze the response of isolated structures at different seismic intensity levels, taking into account different configurations and practical factors.
JOURNAL OF EARTHQUAKE ENGINEERING
(2022)
Article
Environmental Sciences
Jiaming Dong, Qunying Zhang, Wenqiang Huang, Haiying Wang, Wei Lu, Xiaojun Liu
Summary: This article proposes a deceptive jamming algorithm against synthetic aperture radar (SAR) with large squint angles based on non-linear chirp scaling and low azimuth sampling reconstruction (NLCSR). The algorithm accurately constructs the jammer's frequency response function using a high-order approximation of a high-precision model, and completes the construction of the space-variant azimuth modulation phase item using the non-linear chirp scaling method. Compared to traditional algorithms, the NLCSR algorithm only requires Fourier transform and complex multiplication, making it easier to implement while ensuring focusing ability. Simulation results demonstrate the superior focusing ability and computational efficiency of the NLCSR algorithm.
Article
Engineering, Mechanical
Bimal Das, Akhilendra Singh, Puja Ghosal, Ashish Priya, R. Rohith Kumar Reddy
Summary: The study investigates the impact of hydrogen charging on the transformation induced plasticity steel during strain-controlled low cycle fatigue (LCF). Hydrogen charging negatively affects the strain-controlled LCF lives. The uncharged specimen experiences cyclic hardening due to strain-induced martensitic transformation (SIMT), while the hydrogen charged specimen exhibits cyclic softening and suppresses cyclic hardening due to the large fraction of low angle grain boundaries. Additionally, the cyclic plasticity modeling using the Ohno-Wang kinematic hardening model accurately simulates the cyclic stress-strain hysteresis loop and cyclic softening curve of both uncharged and hydrogen charged specimens.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Thermodynamics
Min Chan Kim, Kwang Ho Song
Summary: In this study, the effect of co-injection of CO2 and impurities on buoyancy-driven convection in carbon capture and geological sequestration is investigated. Theoretical and numerical analyses reveal the impact of double diffusion on the onset and growth of convection, providing insights into scaling relations that can be used as control parameters. The findings suggest a new scaling relation based on the temporal change of density gradient in the double diffusive and extended double diffusive convection regimes.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Multidisciplinary Sciences
Emad Aamer, Jorg Thoeming, Michael Baune, Nicholas Reimer, Ralf Dringen, Manuela Romero, Ingmar Boesing
Summary: This paper systematically studies the influence of system parameters such as pH, electrode potential, and educt concentration on NADH regeneration and presents their mechanisms. The experimental results show that all three system parameters have significant effects on the reaction outcome.
SCIENTIFIC REPORTS
(2022)
Article
Chemistry, Physical
Ziyi Yin, Rui Li, Hang Lin, Yifan Chen, Yixian Wang, Yanlin Zhao
Summary: Currently, tailings are mostly piled up in tailings ponds, resulting in a massive waste of mineral resources and posing a significant threat to the environment and ecology. Utilizing tailings to partially replace cement in cementitious materials is an effective method to reduce tailings accumulation. This study prepared lead-zinc tailings-based cementitious materials using lead-zinc tailings, fly ash, and ordinary Portland cement, and investigated the effects of four factors (lead-zinc tailings, fly ash content, cement content, and water-binder ratio) on the mechanical properties of lead-zinc tailings through orthogonal experiments. The corresponding relationship between these factors and the properties of the cementitious materials was determined, achieving optimization and prediction of the raw material ratio for lead-zinc tailings-based cementitious materials. The test results showed that when the proportion of fly ash : lead and zinc tailings : cement was 30:40:30 and the water-binder ratio was 0.4, the predicted compressive strength of the prepared cementitious material reached 22.281 MPa, meeting the strength requirements, while the total content of lead-zinc tailings and fly ash was the highest at that time.
Article
Chemistry, Physical
Linglin Xie, Wenyu Tang, Hang Lin, Fan Lei, Yifan Chen, Yixian Wang, Yanlin Zhao
Summary: In this study, cyclic shearing tests combined with the shear surface topography-sensing technology are conducted to investigate the evolution characteristics of the rock-mortar interface morphology and strength deterioration. The results have important implications for the research on the shear performances of rock-mortar interface under cyclic load in rock mass engineering.
Article
Chemistry, Physical
Yifan Chen, Hang Lin, Shijie Xie, Rihong Cao, Shuwei Sun, Wenhua Zha, Yixian Wang, Yanlin Zhao, Huihua Hu
Summary: In this study, a piecewise constitutive model was proposed to simulate the nonlinear fracture compaction deformation in the whole process of rock failure. The model consisted of a fracture compaction empirical model and a damage statistical constitutive model. The parameters of the models were calculated based on the geometrical characteristics of the axial stress-strain curve to ensure continuity and smoothness at the curve intersection. The models were validated using uniaxial compression test data and triaxial compression test data, showing great consistency with the experimental results, particularly in the pre-peak stage.
Article
Chemistry, Multidisciplinary
Hui Yang, Zhengyi Cao, Xueliang Jiang, Yixian Wang
Summary: Model tests were conducted on plain soil slopes and bamboo-rooted slopes to analyze slope surface displacement, earth pressure changes, and failure modes under slope top loading. The study also examined the impact of rainfall on deformation and mechanical properties of bamboo-rooted slope sliding. Results showed that the failure mode of plain soil slopes was block sliding, while bamboo-rooted slopes experienced progressive backward failure. The presence of bamboo rhizomes had a limited impact on slope displacement but significantly contributed to the sliding area's increase. The tests have important implications for the study of instability and disaster prevention in bamboo forest areas.
APPLIED SCIENCES-BASEL
(2023)
Article
Chemistry, Multidisciplinary
Xiongpeng Zhu, Linglin Xie, Yi Tang, Yifan Chen, Huihua Hu, Guangyin Lu, Changfu Chen, Hang Lin
Summary: Retrogressive landslide is a common occurrence during highway construction, particularly in incised slopes. Determining the damage range of these landslides is crucial for slope control. In this study, a highway retrogressive landslide in Hunan Province was taken as the research object, and particle flow discrete element method was used to simulate the entire failure process. By dividing the rock mass of each part of the slope model and monitoring the displacement of key parts, the researchers were able to simulate the retrogressive landslide and calculate the lateral length of traction instability using stability theory. The research revealed that incised slopes and rainfall are the main causes of retrogressive landslides, and the stability theory can help accurately determine the traction failure range in engineering practice.
APPLIED SCIENCES-BASEL
(2023)
Article
Engineering, Mechanical
Ri-hong Cao, Hongzhe Wang, Xianyang Qiu, Changsong Wang, Hang Lin, Qiuqiu Qiao
Summary: Rock specimens subjected to cyclic impact experienced mesoscale fracture and strength deterioration. The number of impacts led to decreased dynamic peak stress and increased maximum strain and energy absorption. Cyclic impacts also caused continuous damage and more obvious white spots in the specimens with higher impact times. The fracture toughness decreased with increasing impact number, and the fractal characteristics of the fracture surface became more pronounced.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2023)
Article
Chemistry, Physical
Yifan Chen, Yizhou Chen, Hang Lin, Huihua Hu
Summary: In this study, the Hoek-Brown criterion was combined with a nonlinear reduction technique for slope stability evaluation. The relationships that should be satisfied by each parameter of the critical slope were derived, and the critical curve of the slope was obtained. The k-means algorithm was employed to search the potential sliding surface, and the safety factor was calculated as the ratio of sliding resistance to sliding force. The calculated safety factors showed better efficacy compared to other methods.
Article
Chemistry, Physical
Daxing Lei, Haixiang Hu, Yifan Chen, Hang Lin, Chaomei Zhang, Guangli Wang, Zhigang Lu, Yaoping Zhang
Summary: Definitions for the mesoscopic and macroscopic damage to a jointed rock mass under the coupling of freeze-thaw and shear are proposed and verified according to experimental results. The results show that the mechanical properties of jointed rock specimens deteriorate significantly under freeze-thaw cycles and the damage degree becomes more significant with the increase in freeze-thaw cycles and joint persistency. The coupling damage variable can accurately describe the damage variation law of jointed rock mass under freeze-thaw cycles and shear load.
Article
Geosciences, Multidisciplinary
Ercheng Zhao, Juhong Li, Xiongtian Zhang, Chunyang Zhang, Qinglin Ren, Tao Tan, Yixian Wang
Summary: The influence of cracks on the strength and stability of rock masses was studied. Uniaxial compression tests were conducted on pre-cracked granite samples to investigate their fracture characteristics and mechanical properties. The results show that the peak strength of pre-cracked samples decreases significantly compared to intact samples and is related to the inclination angle of the pre-crack. The failure mode of the sample varies with the pre-crack inclination angle, while the central circular through hole and crack stop hole have negligible effects on the failure mode. The study provides valuable insights for the engineering application of pre-cracked granite samples.
FRONTIERS IN EARTH SCIENCE
(2023)
Article
Engineering, Geological
Yixian Wang, Jiye Ouyang, Panpan Guo, Yan Liu, Hang Lin, Xian Li, Xiaonan Gong, Jian Li
Summary: This paper presents a case study of deep braced excavation for the main bridge cushion cap construction of the Yangwan River Bridge to investigate the excavation performance under embankment surcharge load. Three-dimensional finite difference analysis was conducted to simulate the entire construction process and analyze the effects of embankment-excavation distance, water level, and excavation bottom sealing on the behavior of the retaining structure and ground. The study found that settlements and deformations are larger on the side near the embankment. The near-embankment side response is more sensitive to embankment-excavation distance and water level, but these effects diminish when the distance exceeds 1.5 times the excavation depth. The excavation bottom sealing reduces deformations and basal heave, but its effectiveness decreases when the sealing thickness exceeds 1 m.
GEOTECHNICAL AND GEOLOGICAL ENGINEERING
(2023)
Article
Engineering, Geological
Fan Xu, Hang Lin, Xing Zhang, Rihong Cao
Summary: In this paper, a series of rock direct shear tests were carried out by PFC2D to study the relationship between macro-micro parameters during the shear process. The qualitative influence of main microparameters and normal stress on macroscopic shear parameters were analyzed, and quantitative prediction models for the main shear macro-parameters were established. The effectiveness of the model was verified by comparing the simulation results with the predicted values.
GEOTECHNICAL AND GEOLOGICAL ENGINEERING
(2023)
Article
Engineering, Mechanical
Zhanming Shi, Jiangteng Li, Mengxiang Wang, Han Tan, Hang Lin, Kaihui Li
Summary: This study investigates the influence of temperature on the fracture behavior and morphology of granite after thermal shock. The results show that temperature can change the fracture mode of rocks and have a softening effect on rocks. High temperatures can convert rocks from brittle to ductile failure and even change the fracture mode from pure mode III to mixed mode I/III fracture.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2023)
Article
Construction & Building Technology
Gang Han, Hui Zhang, Zherun Wang, Yanyan Wang, Ningning Geng, Panpan Guo, Xian Li, Yanlin Zhao, Hang Lin, Yixian Wang
Summary: This study investigates the behavior of rock socketed piles in limestone stratum with karst cavity. The effects of pile length, pile diameter, limestone cohesion, and cavity roof thickness on pile bearing characteristics are comprehensively analyzed through finite element analyses. The results show that the pile bearing capacity increases nonlinearly with increasing pile length and almost linearly with an increase in pile diameter, limestone cohesion, and cavity roof thickness. Additionally, larger ground displacements occur primarily surrounding the pile side and at the pile bottom due to the weakening effect of the karst cavity on the cavity roof. These findings are valuable for the design optimization of rock socketed piles in karst areas.
CASE STUDIES IN CONSTRUCTION MATERIALS
(2023)
Article
Mechanics
Yanlin Zhao, Xiaguang Wang, Wenyu Tang, Yang Li, Hang Lin, Yixian Wang, Lianyang Zhang
Summary: This paper presents an extensive laboratory investigation of viscoelastic plasticity strain characteristics of layered salt rocks under triaxial loading and unloading cycles. Creep curves were obtained and analyzed using the Burgers model. The study found that the creep deformation of layered salt rocks is mainly viscoelastic under low deviatoric stress and contains both viscoelastic and viscoplastic deformations under high deviatoric stress. The results provide insights for understanding the long-term performance of gas and hydrocarbon liquid storage caverns in layered salt rock formation.
Article
Chemistry, Multidisciplinary
Ibrahim Haruna Umar, Hang Lin, Awaisu Shafiu Ibrahim
Summary: Soil stabilization is crucial for engineering projects, and waste marble powder has shown potential as an additive due to its low cost and environmental benefits. This study explores the effects of waste marble powder on soil strength and ultrasonic pulse velocity and demonstrates the accuracy of artificial neural networks in predicting these values. The results highlight the improvement in soil properties with the addition of waste marble powder and emphasize the importance of the grade and amount of powder used. Overall, this research contributes to the development of sustainable and cost-effective soil stabilization solutions and is valuable for engineers and researchers in the field.
APPLIED SCIENCES-BASEL
(2023)
