Article
Mechanics
Kenneth M. Liechti, Kirill R. Rebrov, Gregory J. Rodin
Summary: This paper examines the potential of detecting interphases associated with thin polymer layers under axial and shear loading. We demonstrate that a recent asymptotic analysis can be extended and holds in the presence of interphases. Our analysis suggests that interphases may significantly reduce the high degree of triaxiality associated with thin, nearly incompressible layers.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2023)
Article
Physics, Applied
Akos Horvath, Attila Sulyok, Csaba Ducso, Robert Schiller
Summary: The dependence of electron work function on the thickness of Ti layers was investigated. A quantum size effect was revealed, showing an increase in work function as the layer thickness decreased below 4 nm. The relationship between the increase in work function and the Planck constant and electron mass was determined using a particle-in-a-box model.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Mechanics
Gregory Baker, Ching Chang, Stefan G. Llewellyn Smith, D. I. Pullin
Summary: In this study, the time evolution of a double vorticity layer consisting of two adjacent fluid strips with different vorticities embedded in an irrotational fluid is considered. A thin-layer approximation is used to derive the nonlinear evolution equations that describe the motion of the layer. The stability analysis and solution of the initial-value problem reveal the instability and linear growth characteristics under certain conditions.
JOURNAL OF FLUID MECHANICS
(2022)
Article
Multidisciplinary Sciences
Nicolas Waisbord, Amin Dehkharghani, Jeffrey S. Guasto
Summary: Through microfluidic experiments, it was found that individual magnetotactic bacteria display three distinct regimes when directed upstream through pores, resembling the electrical conductivity of a diode. This diode-like behavior persists at the pore scale, impacting flow conductivity in higher dimensional geometries. The study has implications for magnetotactic bacteria survival strategies in sediments and potential drug delivery applications in vascular networks.
NATURE COMMUNICATIONS
(2021)
Article
Nanoscience & Nanotechnology
Yang Liu, Thomas Lehnert, Martin A. M. Gijs
Summary: The study explored the collective migration of bacteria, with findings on how different initial inoculum sizes and exposure to antibiotics affect bacterial chemotaxis. The observation of traveling bands was proposed as an alternative for fast antimicrobial susceptibility testing.
MICROSYSTEMS & NANOENGINEERING
(2021)
Article
Chemistry, Multidisciplinary
Tobias Junghoefer, Arrigo Calzolari, Ivan Baev, Mathias Glaser, Francesca Ciccullo, Erika Giangrisostomi, Ruslan Ovsyannikov, Fridtjof Kielgast, Matz Nissen, Julius Schwarz, Nolan M. Gallagher, Andrzej Rajca, Michael Martins, Maria Benedetta Casu
Summary: Magnetism in organic materials is intriguing and the magnetic behavior in purely organic radical thin films is different from that in single crystals. Tuning the film magnetic properties by molecular arrangement holds exciting prospects for revealing new properties and applications.
Article
Optics
G. de Haan, T. J. van den Hooven, P. C. M. Planken
Summary: The study focuses on the time-dependent optical diffraction from ultra-high frequency laser-induced acoustic waves in thin layers of ruthenium deposited on glass substrates. Thermo-optic and strain-optic effects dominate the optical response of Ru layers, with a strong dependency of the speed of sound on the layer thickness and frequency. The frequency-dependent acoustic impedance mismatch between ruthenium and the glass substrate leads to a faster decay of measured signals at higher frequencies, and dynamic changes in the phase/frequency of the acoustic wave are indicated within the first 2 ps after excitation.
Article
Chemistry, Multidisciplinary
Wanda Kellouai, Patrick Judeinstein, Marie Plazanet, Simon Baudoin, Martin Drobek, Anne Julbe, Benoit Coasne
Summary: Molecular simulations and experiments were conducted to investigate methane adsorption in MFI zeolite. The results showed qualitative and quantitative differences in adsorption behavior between internal porosity and external surface of the zeolite. A thermodynamic formalism was proposed to predict methane adsorption in nanoporous solids, providing a general rational framework for fluid adsorption in finely divided materials.
Article
Optics
Geetika Bhardwaj, Krishna Rani Sahoo, Rahul Sharma, Parswa Nath, Pranav R. Shirhatti
Summary: In this paper, we show that imaging surfaces using low-energy neutral atom scattering is capable of distinguishing films as thin as a single monolayer from the substrate. By using collimated beams of He and Kr atoms, we can map the thin films and gain insights into atom-surface collision dynamics and its role in contrast generation.
Article
Chemistry, Physical
Sufyan Shehada, Manuel dos Santos Dias, Filipe Souza Mendes Guimaraes, Muayad Abusaa, Samir Lounis
Summary: The study focused on quantifying hyperfine interactions between atomic spins using STM technology, revealing different interactions of 3d transition metal adatoms on various materials and thicknesses, and identifying core mechanisms. The results have significant implications for future STM investigations aiming at detecting and realizing quantum concepts dependent on nuclear spins.
NPJ COMPUTATIONAL MATERIALS
(2021)
Article
Multidisciplinary Sciences
Avaneesh Narla, Jonas Cremer, Terence Hwa
Summary: Bacterial cells navigate their environment and expand populations through chemotaxis, with chemical sensing and cell growth being key factors. Expansion speeds can be significantly boosted when environmental availability of chemicals relative to cellular sensing limits is high.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Mathematics, Applied
E. D. Bueler
Summary: The text discusses the importance of time-dependent models of fluid motion in climate dynamics and the important subproblems within it. It mentions discrete-time sequences of continuous-space weak formulations, free boundary issues, and limitations to discrete conservation in numerical schemes.
SIAM JOURNAL ON APPLIED MATHEMATICS
(2021)
Article
Multidisciplinary Sciences
Azeem Shahzad, Fakhira Liaqat, Zaffer Ellahi, Muhammad Sohail, Muhammad Ayub, Mohamed R. Ali
Summary: This study investigates the flow and heat transfer of Cu-nanofluid in a thin film over a stretching sheet, considering different shape factors and boundary conditions. The results show that the platelet-shaped nanoparticles have the highest heat transfer rate among the different particle shapes.
SCIENTIFIC REPORTS
(2022)
Article
Microbiology
Ran Mo, Yugeng Liu, Yuanyuan Chen, Yingjin Mao, Beile Gao
Summary: Microbes rely on signal transduction systems to sense and respond to environmental changes. The chemosensory system increases complexity through horizontal gene transfer, while the two-component system gains complexity through the fusion of histidine kinases and receiver domains. The presence and complexity of the c-di-GMP-mediated system are related to the size of the signaling network and can be easily rewired.
Article
Mechanics
Kai-Xin Hu, Sheng Zheng, Qi-Sheng Chen
Summary: The external excitations in thermocapillary liquid layers are investigated through non-modal stability theory, with amplification depending on perturbation velocity and temperature. Large amplifications can occur in subcritical flows at both small and large Prandtl numbers, but the response properties differ significantly between small and large Pr. An optimal response is achieved when the perturbation is nearly a spanwise wave, and the amplification mechanisms also vary between small and large Pr.
Article
Engineering, Multidisciplinary
Filip Ivancic, Tony W. H. Sheu, Maxim Solovchuk
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2020)
Article
Mechanics
Kumar Saurabh, Maxim A. Solovchuk, Tony Wen-Hann Sheu
Summary: The lattice Boltzmann method (LBM) has been widely used in simulating a variety of hydrodynamic and non-hydrodynamic systems, especially in conjunction with the immersed boundary method (IBM) for solving complex geometries. This study introduced the immersed boundary-lattice Boltzmann method (IB-LBM) to simulate nanoscale ion transport, utilizing the fourth order Poisson-Nernst-Planck-Bikerman (4PNPBik) model. The applicability of the 4PNPBik model was demonstrated through comparing experimental and predicted ion activity, and validated by comparing predicted current-voltage curve with analytical results. The study also discussed the role of finite size particles and nonlocal electrostatics in ion transport by comparing results from PNP and 4PNPBik models under the same conditions.
Article
Medicine, General & Internal
Tatiana Filonets, Maxim Solovchuk, Wayne Gao, Tony Wen-Hann Sheu
Summary: Case isolation, contact tracing, and mask wearing are effective intervention measures in controlling the spread of COVID-19, as seen in Taiwan's successful containment of the disease. Mathematical modeling shows that high levels of implementation of these interventions can help to control the outbreak, with different probabilities of outbreak control depending on factors such as mask usage and contact tracing. Superspreading events and restrictions on gathering and social distancing also play a role in controlling the outbreak.
JOURNAL OF CLINICAL MEDICINE
(2021)
Article
Mechanics
Yen-De Chou, Wei-Shien Hwang, Maxim Solovchuk, P. G. Siddheshwar, Tony Wen-Hann Sheu, Symphony Chakraborty
Summary: This paper conducts a two-dimensional linear and weakly nonlinear stability analysis on the problem of salt-finger convection, highlighting the possibility of sub-critical motions and instability regions. The study shows that the stationary mode is preferred over the oscillatory mode, and also discusses heat and mass transports in terms of the Nusselt number and Sherwood number.
Article
Engineering, Multidisciplinary
Filip Ivancic, Maxim Solovchuk
Summary: An energy stable finite element scheme is developed within the ALE framework to simulate the dynamics of millimetric droplets in contact with solid surfaces. It is validated numerically and shown to accurately capture complex droplet dynamics, such as sliding and rolling, on non-homogeneous inclined surfaces while maintaining stability.
APPLIED MATHEMATICAL MODELLING
(2022)
Article
Acoustics
Tatiana Filonets, Maxim Solovchuk
Summary: This study numerically investigates inertial cavitation thresholds under two forms of ultrasonic excitation. The results demonstrate that using dual-frequency signal mode can reduce the threshold pressure, and the criterion based on bubble size gives a lower threshold than the criterion based on bubble collapse speed. An increase in elasticity leads to an increase in the threshold pressure, while viscosity has a small impact on the optimal threshold. The study provides a detailed analysis of inertial cavitation in soft tissue under dual-frequency signal excitation.
ULTRASONICS SONOCHEMISTRY
(2022)
Article
Engineering, Multidisciplinary
Filip Ivancic, Maxim Solovchuk
Summary: This paper presents a finite element method (FEM) moving mesh strategy for simulating the dynamics of droplets on inclined surfaces within an arbitrary Lagrangian Eulerian (ALE) framework. The strategy is capable of tracking droplet evolution regardless of the flow regime and demonstrates a good tradeoff between stability and efficiency. Additionally, attention is given to the discrete energy balance and sources of spurious energy due to mesh motion.
COMPUTER METHODS IN APPLIED MECHANICS AND ENGINEERING
(2022)
Article
Nanoscience & Nanotechnology
Kumar Saurabh, Maxim Solovchuk
Summary: The study focuses on fluid-ion transport in a nanochannel and aims to understand the impact of physical phenomena and medium properties on the flow. Mathematical models, including the fourth order Poisson-Nernst-Planck-Bikerman and Navier-Stokes equations, are used to describe the system. These models consider various interactions, particle size, and polarization effects. The validity of the models is confirmed through analytical and experimental comparisons, and the impact of different factors on fluid velocity is analyzed.
Article
Mechanics
Filip Ivancic, Maxim Solovchuk
Summary: A moving mesh finite element method is proposed to simulate the dynamics of viscoelastic droplets on inclined surfaces. The method incorporates the Oldroyd-B constitutive model to account for viscoelastic effects and uses generalized Navier boundary conditions to include non-homogeneous properties of the inclined surface. The droplet motion is handled using an arbitrary Lagrangian Eulerian framework. The proposed method is validated and compared for Newtonian and non-Newtonian droplets.
JOURNAL OF NON-NEWTONIAN FLUID MECHANICS
(2023)
Article
Chemistry, Multidisciplinary
Kumar Saurabh, Maxim Solovchuk, Tony Wen-Hann Sheu
Summary: This study explores the differences in selectivity between the ion channels of SARS-CoV-1 and SARS-CoV-2 E proteins, and investigates the effects of bath concentration and gradient on the binding ratios of sodium and chloride ions for SARS-CoV-2 E protein. The research findings provide insights into the ion transport properties of these viral proteins.
