Article
Mechanics
Hamid Emami-Meybodi, Fengyuan Zhang
Summary: This study focuses on the buoyancy-driven stability analysis in a three-dimensional inclined porous medium with a capillary transition zone. The results of linear stability analysis and numerical solutions show that the inclination angle plays a crucial role in the stability of the problem.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Mechanics
A. Mizev, E. A. Mosheva, D. A. Bratsun
Summary: In the experimental study, buoyancy-driven instabilities triggered by neutralization reactions were investigated, and a dimensionless parameter called reaction-induced buoyancy number was introduced to classify experimental observations and predict the development of two global scenarios based on the value of this parameter.
One scenario is mainly controlled by diffusion, resulting in weak convective motion, while the other leads to vigorous convection in the upper layer, causing the reaction front to move downwards quickly. A new parameter was shown to plot stability maps for predicting reaction-diffusion-convection processes in similar systems before experiments.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Mechanics
D. A. Bratsun, A. Mizev, E. A. Mosheva
Summary: Theoretical study of buoyancy-driven chemoconvection induced by a neutralization reaction in a system of nitric acid and sodium hydroxide solutions reveals richer possible instabilities than previously thought. The formation of patterns depends on a single parameter, the reaction-induced buoyancy number, leading to insights necessary for a full understanding of the observed phenomena. The mathematical model developed includes reaction-diffusion-advection equations coupled with Navier-Stokes equations, with a focus on transient linear stability analysis and numerical simulations to examine system dynamics.
JOURNAL OF FLUID MECHANICS
(2021)
Article
Mathematics, Applied
Linlin Li
Summary: This paper investigates a time-periodic reaction-diffusion equation in exterior domains, proving the existence and convergence of the entire solution under certain assumptions. Additionally, examples of geometrical shapes of K that lead to complete or incomplete propagation of the solution are provided.
JOURNAL OF NONLINEAR SCIENCE
(2021)
Article
Physics, Fluids & Plasmas
Yorgos Stergiou, Marcus J. B. Hauser, Anne De Wit, Gabor Schuszter, Dezso Horvath, Kerstin Eckert, Karin Schwarzenberger
Summary: This paper is associated with a prize-winning video presented at the 2021 American Physical Society's Division of Fluid Dynamics (DFD) Gallery of Fluid Motion. The original video can be accessed online at the Fluid Motion Gallery website.
PHYSICAL REVIEW FLUIDS
(2022)
Article
Multidisciplinary Sciences
Dmitry Bratsun, Alexey Mizev, Vladimir Utochkin, Svyatoslav Nekrasov, Anastasia Shmyrova
Summary: This article presents the results of a study on buoyancy-driven instabilities caused by a neutralization reaction in an immiscible two-layer system placed in a vertical Hele-Shaw cell. The flow patterns are predicted by a reaction-induced buoyancy number, which is the ratio of densities between the reaction zone and the lower layer. Experimentally, cellular convection, fingering process, and typical Rayleigh-Taylor convection were observed. A mathematical model considering the water produced during the reaction was developed and explained the persistence of the fingering phenomenon during the collapse of the reaction zone.
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
(2023)
Article
Chemistry, Multidisciplinary
Shuo Wu, Florian Schiel, Paolo Melchiorre
Summary: Activating inert substrates is challenging due to their strong covalent bonds and low reduction potentials. Recent advances in photoredox catalysis have provided solutions to activate specific inert bonds. However, developing a general catalytic platform that can consistently target a broad range of inert substrates would be synthetically useful. This study reports the use of an indole thiolate organocatalyst that, when excited with 405 nm light, becomes strongly reducing and able to activate strong C-F, C-Cl, and C-O bonds in both aromatic and aliphatic substrates. Mechanistic studies revealed an excited-state thiolate anion responsible for the highly reducing reactivity.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Astronomy & Astrophysics
Antonios Tsokaros, Milton Ruiz, Stuart L. Shapiro, Vasileios Paschalidis
Summary: We performed general-relativistic simulations of self-gravitating black hole disks with significant tilt and high spin, revealing a range of interesting physical phenomena such as black hole precession, disk precession and warping, early saturation of instability, small black hole kick, and strong gravitational wave emission. These findings have implications for the understanding of short gamma-ray bursts and could be detected by gravitational wave detectors like LIGO/Virgo and LISA.
Article
Astronomy & Astrophysics
Indu K. Dihingia, Bhargav Vaidya, Christian Fendt
Summary: Relativistic jets and disc-winds in black hole X-ray binaries and active galactic nuclei are driven by magnetic field mechanisms. Simulation results show that inner disc truncation and oscillations affect the flaring activities in jet mass flow rates. Models with certain parameters are more prone to plasmoid formation and inner disc oscillations, providing insights into spectral state transition phenomena in BH-XRBs.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2021)
Article
Chemistry, Physical
Adam Bigaj, Marcello A. Budroni, Dario Martin Escala, Laurence Rongy
Summary: It has been found that under isothermal batch conditions, localized oscillations of chemical species concentration can be induced by actively coupling with hydrodynamics. These oscillations can be sustained by the coupling of both surface tension- and buoyancy-driven contributions to the flow, creating oscillatory dynamics. The competition between these antagonistic flows is crucial for the occurrence of oscillations.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Computer Science, Theory & Methods
Sijie Shen, Xingda Wei, Rong Chen, Haibo Chen, Binyu Zang
Summary: This article presents DrTM+B, a live reconfiguration approach for in-memory database systems that seamlessly repartitions data with little disruption to running transactions. It leverages pre-copy and post-copy schemes, a cooperative commit protocol, and log forwarding mechanism to provide high-performance and high availability for distributed transaction processing systems.
IEEE TRANSACTIONS ON PARALLEL AND DISTRIBUTED SYSTEMS
(2022)
Article
Multidisciplinary Sciences
R. Tiani, L. Rongy
Summary: When bimolecular fronts form in solutions, their dynamics can be affected by chemically driven convection such as buoyancy- and Marangoni-driven flows. The dynamics of the front in buoyancy-driven convection can be predicted based on one-dimensional reaction-diffusion concentration profiles, while this method fails in Marangoni-driven convection. This study analyzes the effects of convection on the front properties and the influence of reaction reversibility and initial reactants' concentrations using a two-dimensional reaction-diffusion-Marangoni convection model.
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
(2023)
Article
Chemistry, Multidisciplinary
Vipul Mann, Venkat Venkatasubramanian
Summary: The rapid discovery of new reactions and molecules in recent years has been facilitated by advances in high throughput screening, accessibility to a highly complex chemical design space, and the development of accurate molecular modeling frameworks. This study represents chemical reactions as hypergraphs and demonstrates the applicability of hypergraph representation in AI by using hypergraph embeddings for reaction classification. The hypergraph representation is flexible, preserves reaction context, and reveals hidden insights not apparent in traditional directed graph representations.
REACTION CHEMISTRY & ENGINEERING
(2023)
Article
Thermodynamics
P. R. Redapangu, T. G. Kidan, K. Berhane
Summary: The buoyancy-driven flow of two immiscible liquids with varying density and viscosity in a three-dimensional inclined confined channel was studied. It was found that iso-viscous liquids with higher At values exhibit larger interpenetration.
JOURNAL OF APPLIED FLUID MECHANICS
(2021)
Article
Computer Science, Information Systems
Gjorgji Noveski, Tome Eftimov, Kostadin Mishev, Monika Simjanoska
Summary: This paper proposes a novel approach that provides general recommendations for optimal DL architecture and hyperparameters based on analysis of thousands of published research papers. By using NLP methods to convert unstructured data from scientific papers into structured data, intelligent models are able to learn and propose suitable DL architecture, layer types, and activation functions. The advantages of this methodology include leveraging knowledge from numerous DL papers, aiding in selecting optimal DL setups for specific problems, as well as scalability and flexibility for continual improvement with new publications.
Article
Biology
M. Jabed A. Choudhury, Philip M. J. Trevelyan, Graeme P. Boswell
JOURNAL OF THEORETICAL BIOLOGY
(2018)
Article
Engineering, Multidisciplinary
Jayna Gandhi, Philip M. J. Trevelyan
JOURNAL OF ENGINEERING MATHEMATICS
(2014)
Article
Physics, Fluids & Plasmas
L. A. Riolfo, Y. Nagatsu, S. Iwata, R. Maes, P. M. J. Trevelyan, A. De Wit
Article
Physics, Fluids & Plasmas
C. Almarcha, P. M. J. Trevelyan, P. Grosfils, A. De Wit
Article
Mechanics
J. Carballido-Landeira, P. M. J. Trevelyan, C. Almarcha, A. De Wit
Article
Mathematics, Applied
Philip M. J. Trevelyan
DISCRETE AND CONTINUOUS DYNAMICAL SYSTEMS-SERIES S
(2012)
Article
Engineering, Multidisciplinary
S. Cowell, J. Kent, P. M. J. Trevelyan
JOURNAL OF ENGINEERING MATHEMATICS
(2020)
Correction
Mechanics
C. Ruyer-Quil, P. Trevelyan, F. Giorgiutti-Dauphine, C. Duprat, S. Kalliadasis
JOURNAL OF FLUID MECHANICS
(2020)
Article
Biology
M. Jabed A. Choudhury, Philip M. J. Trevelyan, Graeme P. Boswell
MATHEMATICAL MEDICINE AND BIOLOGY-A JOURNAL OF THE IMA
(2020)
Article
Engineering, Multidisciplinary
P. M. J. Trevelyan, A. De Wit, J. Kent
Summary: This article investigates the linear stability analysis of classical diffusive density profiles for porous media flows. It is found that the growth rate of eigenfunctions decays with time, and the maximum growing wavenumber scales with time. The analytical predictions provide a set of generalized results for the analysis of Rayleigh-Taylor instabilities of nontrivial density profiles.
JOURNAL OF ENGINEERING MATHEMATICS
(2022)
Article
Mathematics
Larry E. Godwin, Philip M. J. Trevelyan, Takeshi Akinaga, Sotos C. Generalis
Summary: This study focuses on the investigation of stratified Taylor-Couette flow using non-modal analysis, exploring the dynamics of perturbations under different temperature conditions. The study highlights the correlation between flow configurations and emphasizes the similarity in transient dynamics. It also examines the subcritical effects of thermal stratification on disturbance dynamics.
Article
Mathematics, Applied
S. C. Generalis, A. De Wit, P. M. J. Trevelyan
Summary: This study investigates the properties of bimolecular reaction-diffusion fronts when reactants A and B are dissolved in two immiscible solvents. The study reveals that in immiscible systems, the direction of bimolecular reaction-diffusion fronts can change up to four times, while in miscible systems, only two changes of direction are possible. Additionally, the study identifies the conditions under which two local maxima in the reaction rate can exist.
APPLIED MATHEMATICS LETTERS
(2023)
Article
Physics, Fluids & Plasmas
P. M. J. Trevelyan, A. J. Walker
Article
Physics, Fluids & Plasmas
V. Loodts, P. M. J. Trevelyan, L. Rongy, A. De Wit
