Article
Construction & Building Technology
Seokjae Heo, Seunguk Na, Wonjun Choi
Summary: This study evaluates the vibration data of high-rise buildings during a typhoon and finds that the current standards for high-frequency vibrations are insufficient in addressing the discomfort caused by low-frequency horizontal vibrations. The study reveals that the top-floor horizontal vibration during strong winds exceeds the proposed average level of vibration perception, indicating that most residents of high-rise buildings are likely to perceive the vibration as uncomfortable.
Article
Mechanics
Shengsheng Xia, Yingjie Wei, Cong Wang
Summary: This paper experimentally investigates the vertical high-speed water entry of a semi-sealed cylindrical shell, and analyzes the unsteady water-entry cavitating flow characteristics. It is found that a nested multi-cavity is generated due to the self-jet phenomenon during water entry, and the morphology of the secondary cavity is more atomized. After secondary impact, a small jet appears at the bottom of the shell, leading to the formation of a quaternary cavity. Moreover, the primary jet time is advanced and the depth of the secondary cavity shortens with the increase in the inner wall length, while the cavity shape becomes more similar to traditional supercavity with the increase in thickness.
Article
Materials Science, Multidisciplinary
Xing Yin, Xiteng Li, Hao Wang, Ke Zhao, Jun Wang, Le Chen, Zhongzhen Wu, Yong Chen
Summary: Al2O3 coatings are a promising material for mitigating LBE corrosion at high temperatures, but preventing inward diffusion remains a challenge. An amorphous Al2O3 coating with an ultra-dense structure was fabricated using continuous high-power magnetron sputtering. After LBE corrosion, nanocavities induced by phase transformation provide a diffusion path for Fe, O, Pb, and Bi, leading to the formation of corrosion products. Furthermore, Pb diffusion and Cr segregation were observed after prolonged exposure to LBE. Overall, this work provides insights into the corrosion mechanism of Al2O3 coatings and offers an optimization method for corrosion resistance.
Article
Chemistry, Physical
Sam Shepherd, Jinggang Lan, David M. Wilkins, Venkat Kapil
Summary: The study presents a method to significantly reduce the computational cost of quantum vibrational spectra of aqueous systems, providing an excellent description of the spectral properties of water and the ability to analyze the unique spectral characteristics of the water-air interface, laying the foundation for studying the behavior of water on complex interfaces.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Chemistry, Physical
Weiwei Huang, Jinyuan Tang, Weihua Zhou, Wen Shao, Mohan Yi, Xing Zhao, Jun Wen
Summary: This study investigates the effects of ultrasonic vibration on the vibration-assisted nanogrinding process of single-crystal iron using a molecular dynamics model. The results show that vibration changes the distribution of dislocations in the plastic zone, leading to fluctuations in material accumulation, temperature, dislocation formation, and subsurface damage. The details of plastic deformation, such as dislocation movement and phase transformation, vary with different vibration frequencies. The reduction in the projected contact area is the main cause for the decrease in grinding force.
APPLIED SURFACE SCIENCE
(2022)
Article
Engineering, Electrical & Electronic
Selcuk Sakar, Sarah K. Ronnberg, Math Bollen
Summary: This study investigates the impact of supraharmonics on the generation of interharmonics in power systems, showing that devices exposed to a fixed supraharmonic frequency may generate interharmonics when the power system frequency deviates from 50/60 Hz. The frequency and magnitude of interharmonics are determined by three factors: the frequency of the supraharmonic component, the voltage magnitude of that component, and the deviation of the power system frequency from 50/60 Hz. The formation of interharmonics is confirmed in a functional model and validated through measurements and numerical simulations.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2021)
Article
Mechanics
Paul Koenig, Patrick Salcher, Christoph Adam, Benjamin Hirzinger
Summary: This paper introduces a new semi-analytical approach for analyzing the dynamic response of railway bridges under high-speed trains. The coupling of bridge and track models is achieved through complex modal expansion and component mode synthesis, demonstrating the influence of soil-structure interaction and track subsystem on dynamic response.
Article
Chemistry, Physical
Giacomo Buccella, Andrea Villa, Davide Ceresoli, Luca Barbieri, Roberto Malgesini, Andres R. Leon-Garzon
Summary: This study compares two different models for the deterioration process of polyethylene exposed to reactive plasma. The first model successfully reproduces the experimentally detected oxidation of the polyethylene surface, while the second model explains the presence of nitrogen on the sample surface.
APPLIED SURFACE SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
Dong-Su Park, Kyoung-Su Park
Summary: In this study, a numerical simulation model was used to investigate the application of high-frequency vibration-assisted coatings in controlling surface wettability, with experimental results validating the reliability of the simulation model and deriving the equation governing wettability modification.
RESULTS IN PHYSICS
(2021)
Article
Engineering, Mechanical
Min Zou, Pan Fang, Yongjun Hou, Huan Peng
Summary: This study focuses on solving the issue of screen mesh blocking caused by identical frequency excitation of vibrating screens. By theoretically deriving and experimentally analyzing the multiple-frequency synchronization of two vibratory motors, the study reveals synchronization conditions and stability criteria between eccentric rotors, and discusses the influence of structural parameters on double-frequency synchronization motion. The experimental results further demonstrate the feasibility of the proposed vibration system, which not only has important reference value for the invention of vibrating screens in the petroleum industry, but also promotes the development of other vibration machines.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2022)
Article
Physics, Fluids & Plasmas
Gaelle Rondepierre, Francois Lequeux, Emilie Verneuil, Nicolas Passade-Boupat, Laurence Talini
Summary: This study reports on the thinning mechanisms of supported films of surfactant (nTAB) solutions above the critical micellar concentration. Depending on the length of the carbon chain of the surfactant and its concentration, two modes of destabilization of the stratified films are observed, including heterogeneous nucleation and spinodal stratification.
Article
Engineering, Multidisciplinary
Hechao Sun, Pan Fang, Huan Peng, Min Zou, Yangyang Xu
Summary: This paper designs a new dynamic vibration absorption device to address the inherent defects of conventional vibrating screens. Through theoretical research and experimental verification, the key factors for system synchronization and vibration isolation are determined, providing theoretical guidance for the design of new vibrating screens.
APPLIED MATHEMATICAL MODELLING
(2022)
Article
Mechanics
Navin Kumar Chandra, Kaustuv Lahiri, Aloke Kumar
Summary: This study investigates the impact of contact angle hysteresis at the liquid-liquid-solid interface on the rod-climbing effect of two immiscible Newtonian liquids using experimental and numerical methods. The results show that the contact angle varies with the rod rotation speed and must be considered for accurate prediction of the climbing effect.
Article
Engineering, Mechanical
Ge Yan, Hong-Xiang Zou, Sen Wang, Lin-Chuan Zhao, Zhi-Yuan Wu, Wen-Ming Zhang
Summary: A novel bio-inspired toe-like structure is developed for low-frequency vibration isolation, possessing favorable high static and low dynamic stiffness characteristics. It effectively isolates low frequency vibration loads and provides a feasible approach to passive vibration control in the low frequency band.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2022)
Article
Mathematics, Applied
Alessandro Bongarzone, Francesco Viola, Francois Gallaire
Summary: The physics-inspired mathematical model presented is based on successive linear eigenmode projections to address the relaxation of small-amplitude and two-dimensional viscous capillary-gravity waves, with a phenomenological nonlinear contact line model included. Each projection leads to a rapid loss of total energy in liquid motion and contributes to its nonlinear damping.
Article
Chemistry, Multidisciplinary
Ahmed El Ghazaly, Heba Ahmed, Amgad R. Rezk, Joseph Halim, Per O. A. Persson, Leslie Y. Yeo, Johanna Rosen
Summary: This study presents a one-step synthesis method for the conversion from Ti3AlC2 MAX to Ti3C2Tz MXene on the order of milliseconds, facilitated by the combination of protons and fluorine ions to selectively etch the MAX phase. The results demonstrate that flexible electrodes fabricated using this method exhibit comparable electrochemical performance to previously reported ones.
Article
Chemistry, Multidisciplinary
Lizebona August Ambattu, Amy Gelmi, Leslie Y. Yeo
Summary: Mechanostimulation using high frequency mechanical cues has been shown to induce differentiation of human mesenchymal stem cells towards an osteoblast lineage. This discovery has significant implications for stem cell differentiation technologies in regenerative medicine.
Article
Chemistry, Physical
Yemima Ehrnst, Heba Ahmed, Robert Komljenovic, Emily Massahud, Nick A. Shepelin, Peter C. Sherrell, Amanda Ellis, Amgad R. Rezk, Leslie Y. Yeo
Summary: In this study, we reported an acoustomicrofluidic method for the rapid synthesis of homogeneous MOF/graphene oxide (GO) planar heterostructures without the need for additives. The method successfully templated quasi-2D MOF crystals onto GO sheets, forming stacked layers. Compared to the traditional 3D copper-based MOF, the quasi-2D MOFs have exposed Cu sites that facilitate efficient coordination with GO. The freestanding membranes constructed with this structure exhibit excellent reduction resistance and integrity of the MOF crystal structure.
JOURNAL OF MATERIALS CHEMISTRY A
(2022)
Article
Nanoscience & Nanotechnology
Nicholas S. L. Chew, Kiing S. Wong, Wei S. Chang, Chien W. Ooi, Leslie Y. Yeo, Ming K. Tan
Summary: Plasma treatment is an efficient chemical-free disinfection method. By combining nanoscale technologies, we have achieved nanoscale plasma activation and surface spraying in a small and lightweight device. This device shows significant improvements in plasma activation and disinfection time compared to previous methods.
MICROSYSTEMS & NANOENGINEERING
(2022)
Article
Engineering, Chemical
James Van Strien, Phred Petersen, Petros Lappas, Leslie Yeo, Amgad Rezk, Sara Vahaji, Kiao Inthavong
Summary: In addition to topical delivery, nasal sprays provide an alternative drug administration route that avoids the need for painful and invasive techniques. However, conflicting studies on the efficacy of nasal drug delivery exist. This study characterizes different types of nasal sprays to provide benchmark experimental data for computational models, aiming to improve future studies on nasal spray drug delivery in the nasal cavity.
JOURNAL OF AEROSOL SCIENCE
(2022)
Article
Engineering, Biomedical
Lizebona August Ambattu, Callum Knight, Keng-hui Lin, Amy Gelmi, Leslie Y. Yeo
Summary: This study investigates the effects of short-duration mechanostimulation on endothelial junction stability and barrier capacity. The study found that the integrity of the endothelial barrier can not only recover but also enhance considerably after transient disruption, thanks to the role of calcium and cAMP signaling. Such enhancement in barrier capacity is useful for developing in vitro models that resemble in vivo conditions.
Article
Multidisciplinary Sciences
Heba Ahmed, Hossein Alijani, Ahmed El-Ghazaly, Joseph Halim, Billy J. Murdoch, Yemima Ehrnst, Emily Massahud, Amgad R. Rezk, Johanna Rosen, Leslie Y. Yeo
Summary: MXenes possess superior electrical properties, but their practical adoption is hindered by oxidative susceptibility. This study demonstrates that subjecting oxidized MXene films to nanoscale electromechanical vibration can remove the oxide layer and restore their electrochemical performance close to the original state. These promising results offer the potential for MXene rejuvenation and improve its practical application.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Yemima Ehrnst, Peter C. Sherrell, Amgad R. Rezk, Leslie Y. Yeo
Summary: A novel strategy using high-frequency hybrid sound waves to enhance hydrogen evolution reactions in neutral electrolytes is presented. By modifying the coordination state of water molecules and utilizing other synergistic effects, the technology achieves a significant reduction in overpotential, increase in current density, and energy saving.
ADVANCED ENERGY MATERIALS
(2023)
Article
Chemistry, Physical
Emily Massahud, Heba Ahmed, Ravichandar Babarao, Yemima Ehrnst, Hossein Alijani, Connie Darmanin, Billy J. Murdoch, Amgad R. Rezk, Leslie Y. Yeo
Summary: This study demonstrates that defects can be engineered into ZIF-8 crystals by coupling high frequency hybrid surface and bulk acoustic waves and applying acoustic radiation pressure and hydrodynamic stresses. The diffusion of guest molecules into the material's pores is enhanced, leading to expansion of the pore framework and the creation of dangling-linker and missing-linker defects. The technology is also shown to be practical for solvent-assisted ligand exchange without compromising the framework porosity or crystal structure.
Article
Chemistry, Multidisciplinary
Emily Massahud, Heba Ahmed, Lizebona A. Ambattu, Amgad R. Rezk, Leslie Y. Yeo
Summary: This study reports a rapid and simple one-pot aerosol-based method for synthesizing metal-organic frameworks (MOFs) and encapsulating enzymes. The method increases the porosity of MOFs and modifies the structure of enzymes, resulting in higher loading efficiency, enhanced enzyme activity, and stronger protective effect against high temperature and organic solvents. Compared to traditional methods, the biocomposite material obtained in this study demonstrates improved enzyme activity and protection.
MATERIALS TODAY CHEMISTRY
(2023)
Article
Mechanics
Jasmine O. Castro, Melati Abdul S. Halim, Lizebona A. Ambattu, Amgad R. Rezk, Ranganathan Prabhakar, Reza Nosrati, Leslie Y. Yeo
Summary: We demonstrate that the time required for a liquid bridge filament to thin and break up under elastocapillary stresses can be used as a proxy for quantifying the motile sperm concentration. By comparing the results with OpenCASA measurements, our platform is capable of predicting sperm quality with high accuracy, sensitivity, and specificity. These findings highlight the potential of our platform as a rapid, low-cost, and portable alternative for veterinary male bovine fertility assessment.
Review
Biophysics
Lizebona August Ambattu, Leslie Y. Yeo
Summary: All cells have the ability to respond to mechanical stimuli through their internal machinery. This review discusses the mechanotransductive processes associated with acoustic stimuli and the applications that arise from the cellular responses, particularly in regenerative therapeutics.
BIOPHYSICS REVIEWS
(2023)