Article
Multidisciplinary Sciences
Xiang Gao, Wengen Ouyang, Michael Urbakh, Oded Hod
Summary: The investigation of corrugated grain boundaries on the frictional properties of extended planar graphitic contacts reveals a nonmonotonic behavior in friction due to dynamic buckling effects. The resulting negative differential friction coefficients can reduce linear scaling of grain-boundary friction with surface area and restore structural superlubricity at increasing length scales. Achieving ultra-low friction at macroscopic scales is highly desirable.
NATURE COMMUNICATIONS
(2021)
Article
Orthopedics
Stephanie Kirschbaum, Fabian Plachel, Maximillian Kerschbaum, Christian Gerhard, Kathi Thiele
Summary: Sonography is a valuable tool for assessing ligamentous instability in the elbow joint, but cannot distinguish between healthy and hypermobile joints. It is important to obtain a complete clinical history and examination, and compare the affected elbow with the contralateral side to assess intraindividual differences.
JOURNAL OF SHOULDER AND ELBOW SURGERY
(2021)
Article
Nanoscience & Nanotechnology
Enlai Gao, Bozhao Wu, Yelingyi Wang, Xiangzheng Jia, Wengen Ouyang, Ze Liu
Summary: This study proposes criteria for predicting superlubricity between heterojunctions based on in-plane stiffness requirements of layered materials and interfacial interactions. By screening first-principles calculation data, 61 heterojunctions with potential superlubricity features were identified out of 208 candidates, providing a universal route for accelerating the discovery of new superlubric heterojunctions.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Physics, Multidisciplinary
Ebru Cihan, Dirk Dietzel, Benedykt R. Jany, Andre Schirmeisen
Summary: Structural superlubricity refers to greatly reduced friction between incommensurate atomically flat surfaces. By measuring the friction of antimony nanoparticles on graphite, this study found a characteristic change in friction during the amorphous-crystalline phase transition above 420 K, which was irreversible upon cooling. The results validate the concept that structural superlubricity is determined by the effectiveness of atomic force canceling processes.
PHYSICAL REVIEW LETTERS
(2023)
Article
Multidisciplinary Sciences
Li Chen, Cong Lin, Diwei Shi, Xuanyu Huang, Quanshui Zheng, Jinhui Nie, Ming Ma
Summary: The study proposes a machine learning-assisted system for automated transfer and performance measurement of structural superlubricity materials. With high accuracy and efficiency, the system provides important support for the research and application of structural superlubricity.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Xiaonong Guo, Weixin Li, Zeyu Xv
Summary: The research findings show that the initial rotational stiffness of eccentric RHS joints is primarily influenced by the web plate's deformation stiffness. As the beam-to-column depth-to-width ratio, beam-to-column thickness ratio, and column width-to-thickness ratio increase, the initial rotational stiffness also increases. The form of the moment distribution in the joint changes and has a significant effect on the rotational stiffness when the beam-to-column flange width ratio reaches or exceeds 0.7. The stiffeners have a direct additive effect on the joint stiffness. The influence of adjacent beams on the joint is minimal, and the spatial effect of the joint can be disregarded. Furthermore, the finite element analysis confirmed the accuracy of the power function model in accurately simulating the static load behavior of the joint, particularly the bending moment-angle relationship.
Article
Multidisciplinary Sciences
Xuanyu Huang, Xiaojian Xiang, Jinghui Nie, Deli Peng, Fuwei Yang, Zhanghui Wu, Haiyang Jiang, Zhiping Xu, Quanshui Zheng
Summary: The article introduces a microscale generator - the Schottky superlubric generator (S-SLG), which can generate high current and power densities while maintaining stable high electrical current density over a long lifetime. Experimental results demonstrate the enduring and virtually unlimited persistence of the S-SLG.
NATURE COMMUNICATIONS
(2021)
Article
Astronomy & Astrophysics
Hans Goedbloed, Rony Keppens
Summary: The theory of instability of accretion disks about black holes, neutron stars, or protoplanets is revisited using the method of the Spectral Web. The study shows that the cylindrical accretion disk differential equation is governed by the forward and backward Doppler-shifted continuous Alfven spectra. The analysis considers the nonaxisymmetry and super-Alfvenic rotation of the Doppler frames, leading to the discovery of super-Alfvenic rotational instabilities. It is conjectured that 3D turbulence in magnetized accretion disks is governed by the excitation of modes from two-dimensional continua of quasi-discrete nonaxisymmetric SARIs.
ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES
(2022)
Article
Computer Science, Interdisciplinary Applications
Agustin Ruiz Lopez, Aikaterini Tsiampousi, Jamie R. Standing, David M. Potts
Summary: This paper presents a comprehensive investigation into the bending moment-rotation behavior of two different geometries of GCI tunnel joints using 3D finite element analysis. The study reveals that the removal of bolts from the joints eliminates the possibility of tensile failure. It also shows that the initial bolt preload only influences the rotational stiffness after a certain amount of rotation has occurred, and does not affect the bending moment of opening. Moreover, the out-of-plane displacement restraint has little influence on the joint response.
COMPUTERS AND GEOTECHNICS
(2023)
Article
Mechanics
Semsettin Kilincarslan, Yasemin Simsek Turker
Summary: Glulam columns and beams are structural wood engineering products formed by gluing timbers together, commonly using steel, aluminum, or wood at joints. Recent emphasis has been on non-metallic fasteners due to corrosion and heat resistance issues. This study focuses on strengthening glulam column-beam joints with carbon fiber reinforced polymer, showing increased strength and durability in the connection area.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Civil
Baozhuang Zhang, Qifang Xie, Shengying Li, Lipeng Zhang, Yajie Wu
Summary: In this study, the effect of gaps on the rotational behavior of traditional timber mortise-tenon (M-T) joints was evaluated through experimental testing and modeling analysis. The results showed that gaps caused a decrease in the bending moment, initial rotational stiffness, and energy dissipation capacity of the joints, but the joints exhibited good deformation capacity. Empirical degradation formulas considering the gap effects were established based on the experimental results, and a hysteretic model for joints with gaps was proposed and validated, demonstrating good agreement between the model predictions and experimental results.
ENGINEERING STRUCTURES
(2022)
Article
Orthopedics
Philip-C Nolte, Joe J. Ruzbarsky, Kaare S. Midtgaard, Kira K. Tanghe, Bryant P. Elrick, Brenton W. Douglass, Alex W. Brady, Peter J. Millett
Summary: This study aimed to determine the anatomy of the AC capsule and ligament for reconstruction purposes. The findings of consistent angles, attachment areas, distances, and insertion sites, along with the clockface model, may guide surgeons in optimal ligament reconstruction.
AMERICAN JOURNAL OF SPORTS MEDICINE
(2021)
Article
Orthopedics
Roeland P. Kleipool, Sjoerd A. S. Stufkens, Jari Dahmen, Gwendolyn Vuurberg, Geert J. Streekstra, Johannes G. G. Dobbe, Leendert Blankevoort, Markus Knupp
Summary: The study found that the inclination angle of the posteroinferior talar facet was significantly more plantarly orientated in patients with chronic ankle instability compared to healthy controls. This suggests that a more plantarly and valgus orientated posteroinferior talar facet may be associated with chronic ankle instability.
JOURNAL OF ORTHOPAEDIC RESEARCH
(2022)
Article
Thermodynamics
Marius Vermaak, Daniel Orejon, Jaco Dirker, Khellil Sefiane, Josua P. Meyer
Summary: The fluid instability during flow-boiling of Perfluorohexane in a flat horizontal micro/mini channel was experimentally investigated. The results showed that the flow instability was most severe when the heated surface was horizontal and increased with higher mass and heat fluxes. Flow instability often led to improved heat transfer performance.
APPLIED THERMAL ENGINEERING
(2023)
Article
Engineering, Civil
Ya-Jie Wu, Lei Wang, He-Shou Lin, Li-Peng Zhang, Qi-Fang Xie
Summary: This study provides a detailed explanation of the effect of shear force on straight mortise-tenon joints and proposes a theoretical analysis method considering shear force. The research reveals that the rotational performance of these joints under combined shear and bending is mainly influenced by the ratio of net frame span to tenon depth.
Article
Chemistry, Multidisciplinary
Xifeng Chen, Junjie Luo, Sara Khan, Ruiping Shi, Pengyang Li, Songlin Shi, Jianglei Hu, Fengwei Shi
Summary: In this study, a synthetic medium and active ingredient, phosphomolybdic acid (HPMo) solution, was used to prepare a thick porous wall silicon composite based on HPMo (HPMo@OMS) using the one-step co-condensation method. The composite material exhibited an ordered 2D hexagonal mesoporous structure similar to SBA-15. Compared to HPMo@SBA-15 synthesized in hydrochloric acid solution, HPMo@OMS had a pore wall thickness approximately 2 nm thicker. The catalyst showed high desulfurization activity under mild experimental conditions, achieving a 100% removal rate for sulfur-containing substrate. After 10 desulfurization cycles, the recovered Mo content of HPMo@OMS was only 1.67% by ICP-AES, and the removal rate of DBT remained at 93.5%.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2023)
Article
Chemistry, Multidisciplinary
Ruiyun Li, Xing Yang, Ming Ma, Junyan Zhang
Summary: The hydrogen-induced thermodynamic reaction in friction experiments can convert amorphous carbon into graphene, which is of great importance for achieving solid-state transformation between different carbon allotropes and synthesizing other graphitic encapsulated catalysts with doped elements.
Article
Biochemistry & Molecular Biology
Mingyan Xu, Junling Zhang, Xuemei Lu, Fan Liu, Songlin Shi, Xiaoling Deng
Summary: SMARCA4 is highly upregulated in oral squamous cell carcinoma (OSCC) tissues, promoting cell invasion and tumor growth. Mechanistic studies reveal that miR-199a-5p-regulated SMARCA4 promotes tumor cell invasion and metastasis through epithelial-mesenchymal transition (EMT). These findings provide insights into the role of SMARCA4 in OSCC and have important implications for therapy.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Chemistry, Physical
Han Li, Zhi Xu, Ming Ma
Summary: This study provides experimental evidence for the temperature dependence of boundary slip at the liquid-solid interface. The results show that the slip length is negatively correlated with temperature for water and 0.1 M NaCl solution, but positively correlated with temperature for 1 M NaCl solution.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Mechanics
Donovan Chaffart, Songlin Shi, Chen Ma, Cunjing Lv, Luis A. Ricardez-Sandoval
Summary: This study develops a semi-empirical force balance-based moving front kinetic Monte Carlo (FB-MFkMC) model to describe droplet spreading. The model captures molecular-level events accurately and efficiently by depicting the state-by-state evolution of a sessile droplet in a stochastic manner. The movement of the droplet triple contact line is depicted using rate expressions derived based on force balance and the viscous damping force is represented using a new semi-empirical expression. The proposed approach is validated using experimental and literature data and provides insights into the behavior of the sessile droplet system.
Article
Multidisciplinary Sciences
Guandong Cui, Zhi Xu, Han Li, Shuchen Zhang, Luping Xu, Alessandro Siria, Ming Ma
Summary: Investigation on the response and performance of individual carbon nanotubes under osmotic forcing is lacking. In this study, we measure the osmotic energy conversion for individual double-walled carbon nanotubes and find a giant power density and slip length. Our results suggest that carbon nanotubes are a good candidate for ultrafast transport and osmotic power harvesting under salinity gradients.
NATURE COMMUNICATIONS
(2023)
Article
Multidisciplinary Sciences
Xuanyu Huang, Tengfei Li, Jin Wang, Kai Xia, Zipei Tan, Deli Peng, Xiaojian Xiang, Bin Liu, Ming Ma, Quanshui Zheng
Summary: This study achieves robust structural superlubricity state between microscale graphite flakes and nanostructured silicon surfaces under ambient conditions. The friction is always less than 1 mu N, the differential friction coefficient is on the order of 10(-4), without observable wear. This is attributed to the edge warping of graphite flake on the nanostructured surface under concentrated force, which eliminates the edge interaction between the graphite flake and the substrate.
NATURE COMMUNICATIONS
(2023)
Article
Multidisciplinary Sciences
Xiaojuan Zhang, Guoyan Wang, Peihao Peng, Yongxiu Zhou, Zhuo Chen, Yu Feng, Yanru Wang, Songlin Shi, Jingji Li
Summary: With economic and social globalization, invasive alien species have become a significant threat to local ecological security. This study analyzed the invasive mechanisms of Ageratina adenophora in southwest China and found that environmental factors played a major role in its invasion, while human activity and climate factors had a lesser influence. The study highlights the importance of optimizing community structure to control and mitigate the invasion of A. adenophora.
Article
Nanoscience & Nanotechnology
Dinglin Yang, Cangyu Qu, Yujie Gongyang, Quanshui Zheng
Summary: Researchers have developed a micro-dome technique to measure fundamental properties of layered materials and solve relevant challenges. This technique successfully increases the contact area of graphite mesas, allowing for the observation of interfacial structures and providing a platform for future research.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Thermodynamics
Zhenyu Song, Yusi Zhou, Liqiang Ai, Min Chen, Ming Ma
Summary: A new model for evaporation/condensation is developed based on chemical kinetics. The model is validated through molecular dynamics simulations of argon condensation. The density expression of the model is consistent with the MD simulation results.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Multidisciplinary Sciences
Tianyi Han, Wei Cao, Zhi Xu, Vahid Adibnia, Matteo Olgiati, Markus Valtiner, Liran Ma, Chenhui Zhang, Ming Ma, Jianbin Luo, Xavier Banquy
Summary: Water-based lubricants are widely used in various applications for lubricating rubbing surfaces. The structure of hydrated ion layers adsorbed on solid surfaces plays a crucial role in determining the lubricating properties of aqueous lubricants. We demonstrate that the ion surface coverage has a significant impact on the roughness and lubricating performance of the hydration layer, especially under subnanometer confinement. We investigate different hydration layer structures on surfaces lubricated by aqueous trivalent electrolytes, and observe two superlubrication regimes with distinct friction coefficients and dependence on the hydration layer structure.
Article
Forestry
Mengyue Huang, Guoyan Wang, Xiaojuan Bie, Yunqing Jiang, Xiyue Huang, Jing-Ji Li, Songlin Shi, Tingbin Zhang, Pei-Hao Peng
Summary: This study reveals that seasonal snow cover patterns play a crucial role in determining treeline elevation in the eastern Himalayas. The research finds that treeline elevation increases with summer temperature and snowline elevation, but decreases with snow cover days and spring temperature. Spring snowline elevation and seasonal snow cover days have the greatest impact on treeline elevation, suggesting that the effects of temperature and moisture on treeline elevation are strongly mediated by seasonal snow cover.
Article
Physics, Fluids & Plasmas
Zhi Xu, Han Li, Ming Ma
Summary: Fluctuations are fundamental and inevitable in dynamical quantities. In nanotechnology research, the reduction of system size leads to large relative fluctuation and uncertainty in estimating dynamical quantities. This study proposes a theory that constructs auxiliary paths for each real path, allowing for increased statistical efficiency in accurate estimation. By implementing the theory in molecular dynamics simulations, a nanoscale Couette flow field with high accuracy and reduced sampling requirements is achieved. The predicted thermolubric behavior is validated by experiment, demonstrating the potential of this theory in providing insights on atomic level and benefitting studies on mass transport and fluid film lubrication in nanoscale systems.
Article
Nanoscience & Nanotechnology
Weipeng Chen, Tielin Wu, Yelingyi Wang, Yiran Wang, Ming Ma, Quanshui Zheng, Zhanghui Wu
Summary: This paper introduces a nondestructive filtering technique that utilizes electrical measurement to identify stable graphite flakes and confirms their delamination-free behavior. The study also discovers that the thickness of the filtered flakes is consistent with the single crystalline graphite layer thickness, suggesting the absence of incommensurate interfaces. This technique provides a possible solution to the delamination problem in layered materials and shows the potential to characterize the microstructure of vdW materials on a large scale.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Multidisciplinary Sciences
Li Chen, Cong Lin, Diwei Shi, Xuanyu Huang, Quanshui Zheng, Jinhui Nie, Ming Ma
Summary: The study proposes a machine learning-assisted system for automated transfer and performance measurement of structural superlubricity materials. With high accuracy and efficiency, the system provides important support for the research and application of structural superlubricity.
NATURE COMMUNICATIONS
(2023)