Article
Mechanics
Jarrett Boyd, Gram Hepner, Maxwell Ujhazy, Shawn Bliss, Melikhan Tanyeri
Summary: Recent advancements in science and engineering have enabled trapping and manipulation of individual particles and macromolecules in water using a flow-based confinement method. This study demonstrates the feasibility of trapping and manipulating two micro/nanoscale particles using coupled planar extensional flows. The results show that precise control of particle confinement and interparticle distance can be achieved by manipulating strain rates and particle positions. The findings contribute to our understanding of feedback-controlled particle manipulation and have potential applications in polymer science and biology.
Article
Multidisciplinary Sciences
Joseph F. Emmings, Simon W. Poulton, Joanna Walsh, Kathryn A. Leeming, Ian Ross, Shanan E. Peters
Summary: This study provides a temporal record of redox conditions in the water column of anoxic basins by analyzing the distribution and chemistry of sedimentary pyrite. The analysis reveals the evolutionary history of anoxic basins and explores the underlying factors driving the types of pyrite formed.
Article
Chemistry, Physical
Laura Scalfi, Domenico Vitali, Henrik Kiefer, Roland R. Netz
Summary: Finite-size effects pose challenges in molecular dynamics simulations due to their significant impact on computed static and dynamic properties, particularly diffusion constants, friction coefficients, and time- or frequency-dependent response functions. This study investigates the influence of periodic boundary conditions on velocity autocorrelation function and frequency-dependent friction of particles in a fluid, revealing significant effects on long-time behavior starting at the picosecond timescale. An analytical correction is developed to subtract the periodic boundary condition effects, thereby uncovering power-law long-time tails of the memory kernel and velocity autocorrelation function in liquid water and a Lennard-Jones fluid even with small simulation boxes.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Mathematics, Applied
A. A. Kashchenko
Summary: This paper investigates the nonlocal dynamics of a singular perturbed system of two nonlinear delay differential equations simulating two coupled oscillators. Through a special asymptotic method, the study of relaxation cycles is reduced to studying the dynamics of a constructed finite-dimensional map. The results show that small coupling can lead to loss of stability and the emergence of stable inhomogeneous relaxation cycles.
COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION
(2021)
Article
Physics, Multidisciplinary
V. V. Belykh, A. R. Korotneva, D. R. Yakovlev
Summary: By simultaneously applying a radio frequency field and periodic optical pulses, this study successfully addresses the issue of inhomogeneity and fluctuating environment affecting the coherence time of an electron spin ensemble. The research resulted in a 50-Hz-narrow electron spin resonance with milliseconds-long T-2 in Ce3+ ions, paving the way for coherent optical manipulation in spin systems decoupled from their inhomogeneous environment.
PHYSICAL REVIEW LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Egor Kiselev
Summary: By using a hydrodynamic approach, it was shown that charge diffusion in two-dimensional Coulomb interacting liquids with broken momentum conservation is intrinsically anomalous. The charge relaxation is governed by an overdamped, superdiffusive plasmon mode, with diffusing particles following Levy flight trajectories. The study also explored the influence of magnetic fields on hydrodynamic collective modes, showing that they slow down the superdiffusive process.
Article
Automation & Control Systems
Qiang Xiao, Zhigang Zeng, Tingwen Huang, Frank L. Lewis
Summary: This paper investigates positivity and asymptotic stability for a class of timescale-type differential-difference equation with time-varying delay. Necessary and sufficient conditions for bounded and unbounded delay cases are obtained, and results are extended to corresponding continuous-time systems.
Article
Materials Science, Multidisciplinary
Hamed Attariani, I. Valery Levitas
Summary: Oxidation is still a significant challenge in various industrial applications due to its coupled multi-physics nature. A general large-strain mechanochemical theory was developed to model anisotropic reaction/compositional strain, introducing a kinetic relationship between deviatoric reaction deformation rate and stress. The new model showed that deviatoric stress alters the chemical equilibrium constant and reaction rate through reaction-induced deviatoric stress.
Article
Engineering, Mechanical
K. V. Swarnalatha, Sarma L. Rani
Summary: We propose novel solutions based on the method of multiple scales to solve the nonlinear equations governing the time-dependent amplitudes of coupled acoustic modes in a quasi one-dimensional duct. Our results show that both the MMS and KBMA approaches are in good agreement with numerical solutions, and the MMS method can eliminate low-frequency oscillations in the outer envelope under linear decoupling. The stability criteria are analyzed using the MMS and KBMA solutions, and the stability boundaries are illustrated.
NONLINEAR DYNAMICS
(2023)
Article
Geosciences, Multidisciplinary
Sara Rodriguez-Molina, Pablo J. Gonzalez, Maria Charco, Ana M. Negredo, David A. Schmidt
Summary: The study analyzes the intermittent uplift signals of the Three Sisters volcano in Oregon and re-evaluates its source characteristics and evolution process using a Bayesian inversion method. The results indicate that inflation at the Three Sisters volcano started between October 1998 and August 1999 and is expected to continue for several decades. Proper modeling of scaled inflation time series reveals a unique exponential decay in temporal behavior, suggesting a reduced set of physical processes governing inter-eruptive uplift signals.
FRONTIERS IN EARTH SCIENCE
(2021)
Article
Mathematics, Applied
Baptiste Bergeot, Sergio Bellizzi, Sebastien Berger
Summary: This study investigates the problem of passive mitigation of vibratory instabilities caused by two unstable modes using a single nonlinear energy sink (NES). The complexification-averaging method is applied to characterize the response regimes, revealing that NES attachment can produce bounded responses and suggest the system may have simultaneous stable attractors. Theoretical results and numerical simulations show good agreement, validating the proposed asymptotic analysis.
COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION
(2021)
Article
Computer Science, Interdisciplinary Applications
Yu. M. Belousov, V. P. Krainov, S. V. Revenko
Summary: Traditionally, arteries were seen as elastic tubes that could slowly change diameter to regulate blood supply, but recent research revealed arteries are more complex and can rapidly alter elasticity during a cardiac cycle due to smooth muscle activation. This leads to different arterial pulsing modes (passive, active, intermediate) impacting hydraulic impedance and blood transport. Active arterial pulsing can decrease impedance and support the heart's pumping action.
MEDICAL & BIOLOGICAL ENGINEERING & COMPUTING
(2021)
Article
Chemistry, Multidisciplinary
Sandra Rocha, Ranjeet Kumar, Bengt Norden, Pernilla Wittung-Stafshede
Summary: The study reveals that alpha-synuclein binds to negatively charged vesicles and reorients its helix structure under shear flow, tilting into the vesicle membrane. The presence of flow accelerates the reorientation dynamics of the protein, suggesting a potential flow catalysis mechanism to overcome steric barriers.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2021)
Article
Acoustics
Nastaran Azizollahi, Ensiyeh Taheri, Mohammad Mehdi Amin, Arvin Rahimi, Ali Fatehizadeh, Xun Sun, Sivakumar Manickam
Summary: In this research, hydrodynamic cavitation (HC) and zero-valent iron (ZVI) were used to generate sulfate radicals for the degradation of Direct Red 83 (DR83). The degradation efficiency of HC/ZVI/sulfite process was highly dependent on the solution pH and the dosage of ZVI and sulfite. The HC/ZVI/sulfite treatment showed a significantly higher degradation constant and contribution of radicals compared to the individual processes.
ULTRASONICS SONOCHEMISTRY
(2023)
Article
Multidisciplinary Sciences
Jan Premus, Frantisek Gallovic, Jean-Paul Ampuero
Summary: This study utilized a Bayesian dynamic source inversion method to jointly analyze coseismic and postseismic observations of the 2014 South Napa earthquake, providing insights into how fault stress and friction properties affect the spatial separation between afterslip and coseismic slip, driving deep off-fault aftershocks and influencing rupture shapes.
Article
Chemistry, Physical
Yiping Yin, Zhe Wang, Hua Zou
Summary: This study presents a novel method for preparing dimpled polymer-silica nanocomposite particles using interfacial swelling-based seeded polymerization. The optimized conditions allow for a relatively high percentage of dimpled particles to be achieved.
Article
Chemistry, Physical
Brenden D. Hoehn, Elizabeth A. Kellstedt, Marc A. Hillmyer
Summary: Porous materials with nanometer-scale pores have important applications as nanoporous membranes. In this study, ABA triblock copolymers were used as precursors to produce nanoporous polymeric membranes (NPMs) in thin film form by degrading the end blocks. Polycyclooctene (PCOE) NPMs with tunable pore sizes were successfully prepared using solvent casting technique. Oxygen plasma etching was employed to improve the surface porosity and hydrophilicity of the membranes. This study provides a straightforward method to produce tough NPMs with high porosity and hydrophilic surface properties.
Article
Chemistry, Physical
Vladislav S. Petrovskii, Stepan I. Zholudev, Igor I. Potemkin
Summary: This article investigates the behavior of linear and ring polypeptide chains in aqueous solution and explores the properties of the complexes formed by these chains with oppositely charged surfactants. The results demonstrate that the complexes of linear supercharged unfolded polypeptides and the corresponding surfactants exhibit impressive adhesive properties.
Article
Chemistry, Physical
Merve Cevik, Serkan Dikici
Summary: Cardiovascular diseases are a leading cause of death globally, and vascular grafts are a promising treatment option. This study focuses on tissue-engineered vascular grafts (TEVGs) using decellularized parsley stems as a potential biomaterial. The decellularized parsley stems showed suitable properties for TEVGs, providing a suitable environment for human endothelial cells to form a pseudo endothelium. This study showcases the potential of using parsley stems for TEVGs.
Article
Chemistry, Physical
Gustavo A. Vasquez-Montoya, Tadej Emersic, Noe Atzin, Antonio Tavera-Vazquez, Ali Mozaffari, Rui Zhang, Orlando Guzman, Alexey Snezhko, Paul F. Nealey, Juan J. de Pablo
Summary: The optical properties of liquid crystals are typically controlled by electric fields. In this study, we investigate the effects of microfluidic flows and acoustic fields on the molecular orientation and optical response of nematic liquid crystals. We identify several previously unknown structures and explain them through calculations and simulations. These findings hold promise for the development of new systems combining sound, flow, and confinement.
Article
Chemistry, Physical
Xinjun Wu, Xin Guan, Shushu Chen, Jiangpeng Jia, Chongyi Chen, Jiawei Zhang, Chuanzhuang Zhao
Summary: This research presents a novel shape memory hydrogel with a remodelable permanent shape and programmable cold-induced shape recovery behavior. The hydrogel is prepared using specific treatment methods to achieve shape fixation by heating and shape recovery by cooling. Additionally, deformable devices can be obtained by assembling hydrogel blocks with different concentrations.
Article
Chemistry, Physical
Rebecca Hengsbach, Gerhard Fink, Ulrich Simon
Summary: This study examines the properties of DNA functionalized pNipmam microgels and pure pNipmam microgels at different concentrations of sodium chloride and in PBS solutions using temperature dependent H-1-NMR measurements. The results show that DNA modification affects the volume phase transition temperature and the addition of salt and PBS further enhances this effect.
Article
Chemistry, Physical
Ningyi Li, Junhong Li, Lijingting Qing, Shicheng Ma, Yao Li, Baohui Li
Summary: This paper investigates the self-assembly behavior of colloids with competing interactions under spherical confinement and finds that different ordered structures can be formed under different sized spherical confinements. Moreover, more perforated structures are formed in smaller spheres.