Article
Physics, Fluids & Plasmas
Patrick Charbonneau, Peter K. Morse, Will Perkins, Francesco Zamponi
Summary: Based on results from physics and mathematics literature, three scenarios for the fate of hard sphere crystallization in high dimensions are formulated, with scenario C being the most likely according to the investigation of densest sphere packings.
Article
Computer Science, Information Systems
Nihar Gargava, Vlad Serban
Summary: This article obtains algorithmically effective versions of dense lattice sphere packings constructed from orders in Q-division rings. The lattices discussed are lifts of suitable codes from prime characteristic to orders O in Q-division rings, and a Minkowski-Hlawka type result for such lifts is proven. By exploiting the additional symmetries under finite subgroups of units in O, effective constructions of lattices approaching the best known lower bounds on the packing density ?(n) in various new dimensions n are achieved. This unifies and extends previous constructions.
IEEE TRANSACTIONS ON INFORMATION THEORY
(2023)
Article
Chemistry, Physical
Andraz Gnidovec, Anze Bozic, Simon Copar
Summary: Packing problems are common in nature and have been extensively studied through experiments and numerical models. This study focuses on the packing of ellipsoidal particles on a curved surface and finds that closed curved surfaces can introduce disorder, which is crucial for studying monodispersed random packings.
Article
Physics, Multidisciplinary
Zackery A. Benson, Anton Peshkov, Nicole Yunger Halpern, Derek C. Richardson, Wolfgang Losert
Summary: The study investigates the reversibility of a three-dimensional granular system under cyclic compression and reveals the significant role of rotational motion in granular flows. The findings indicate that 3D rotations are irreversible under cyclic compression, leading to the accumulation of dissipative contact-point sliding throughout the cycle.
PHYSICAL REVIEW LETTERS
(2022)
Article
Chemistry, Physical
Julia A. Giannini, Ethan M. Stanifer, M. Lisa Manning
Summary: This study examines structural indicators for predicting plasticity in active materials, developing a computational model and extending a linear response method. The research highlights the significant impact of strong pressure gradients and self-generated free boundaries on the linear response of the system in predicting plasticity in active packings.
Article
Polymer Science
Daniel Martinez-Fernandez, Miguel Herranz, Katerina Foteinopoulou, Nikos Ch. Karayiannis, Manuel Laso
Summary: The local and global order in dense packings of linear, semi-flexible polymers of tangent hard spheres are studied using extensive Monte Carlo simulations. The study focuses on the effect of packing density and chain stiffness on the self-organization of chains at both local and global levels. The results provide a complete phase diagram showing various crystal morphologies and mesophases as a function of packing density and equilibrium bending angle.
Article
Thermodynamics
Abdolreza Kharaghani, Hafiz Tariq Mahmood, Yujing Wang, Evangelos Tsotsas
Summary: Experimental and numerical studies on convective drying of capillary porous media under slow isothermal conditions show that capillary liquid rings near particle-particle contacts significantly accelerate the drying process, act as additional hydraulic pathways, and lead to a spatially homogeneous distribution of liquid down to low saturation, providing valuable insights for complex multiphase flow phenomena in porous media.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2021)
Article
Chemistry, Physical
Giorgio Cinacchi
Summary: This work describes the derivation of a random contact equation to predict the packing fraction of a dense disordered state of elongate particles. The derivation is based on the compressibility equation and the pair-correlation function, and the predicted results are compared to experimental data.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Multidisciplinary Sciences
Sean A. Ridout, Jason W. Rocks, Andrea J. Liu
Summary: In frictionless jammed packings, localized physics dominates in low dimensions, but loses relevance as dimensions increase. Using machine learning, this study finds that a local structural variable, softness, correlates with rearrangements in different dimensions, providing direct evidence that local structure plays an important role in higher dimensions.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Mathematics
Dimitrios Ntalampekos
Summary: A Sierpinski packing in the 2-sphere refers to a countable collection of disjoint, non-separating continua with diameters shrinking to zero. We prove that any Sierpinski packing by continua whose diameters are square-summable can be uniformized by a disk packing with a packing-conformal map, which generalizes conformality in open sets. Sierpinski carpets and some domains, as special cases of Sierpinski packings, can also be uniformized by disk packings. As a corollary, the conformal loop ensemble (CLE) carpets can be conformally uniformized by disk packings, answering a question of Rohde-Werness.
ADVANCES IN MATHEMATICS
(2023)
Article
Chemistry, Physical
Charles Emmett Maher, Frank H. Stillinger, Salvatore Torquato
Summary: The study explores how changing the compression/shear rate of two-dimensional packings of noncircular particles affects their densest possible configuration. The adaptive shrinking cell (ASC) optimization scheme is utilized to maximize packing fraction by applying random translations, rotations, and compressions/shears. Kinetic effects are most significant when particles have greater asphericity, less curvature, and less rotational symmetry, which may be important for designing laboratory packing protocols.
JOURNAL OF PHYSICAL CHEMISTRY B
(2021)
Article
Astronomy & Astrophysics
Niclas Schneider, Grzegorz Musiolik, Jonathan E. Kollmer, Tobias Steinpilz, Maximilian Kruss, Felix Jungmann, Tunahan Demirci, Jens Teiser, Gerhard Wurm
Summary: In protoplanetary disks, dense particle configurations play a significant role in planet formation by influencing the motion of solid particles and their interaction with gas. The study found that even with a solid-to-gas ratio greater than 1, the concept of gas drag in a viscous medium still applies, but with a reduction factor dependent on the average mass ratio. This leads to faster movement and collisions of grain flocks in protoplanetary disks than expected based on their constituents.
Article
Astronomy & Astrophysics
Takeru K. Suzuki
Summary: By using ideal magnetohydrodynamical (MHD) simulations, researchers investigated MHD turbulence excited by magnetorotational instability. The study found that the cylindrical simulation exhibited larger temporal variation in magnetic activity compared to the Cartesian simulation, despite having similar time-averaged field strengths. The compression of toroidal magnetic fields and the winding due to differential rotation were revealed to be equally important in amplifying magnetic fields and triggering intermittent magnetic bursts in the cylindrical simulation, which were not observed in the Cartesian simulation. The radial gradient of epicyclic frequency was identified as the cause of this fundamental difference. The simulation also showed the formation of narrow localized structures due to the spatial variation of the epicyclic frequency.
ASTROPHYSICAL JOURNAL
(2023)
Article
Environmental Sciences
Dongfeng Jia, Weiping Zhang, Yuhao Wang, Yanping Liu
Summary: The study presents a piecewise cylinder fitting method to calculate the relative inclination of a cylindrical steel structure and verifies its accuracy and effectiveness through real data, indicating high application value in the field of structure deformation monitoring.
Article
Chemistry, Physical
Hugo Imaz Gonzalez, Giorgio Cinacchi
Summary: This work numerically investigates dense disordered jammed packings of hard spherocylinders with cylinder length L and diameter D. The study confirms the form of the graph phi;(MRJ hsc) versus L/D and finds that the maximal phi;(MRJ hsc) = 0.721 & PLUSMN; 0.001 occurs at L/D = 0.45 & PLUSMN; 0.05. Furthermore, the structure of these dense disordered jammed packings and their isostatic behavior for hard spherocylinders with 0.45 & LSIM; L/D & LE; 2 are characterized in detail.
JOURNAL OF PHYSICAL CHEMISTRY B
(2023)
Article
Chemistry, Physical
A. J. Meagher, F. Garcia-Moreno, J. Banhart, A. Mughal, S. Hutzler
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2015)
Article
Biology
A. Mughal, S. J. Cox, G. E. Schroeder-Turk
Article
Education, Scientific Disciplines
Denis Weaire, Ali Irannezhad, Adil Mughal, Stefan Hutzler
AMERICAN JOURNAL OF PHYSICS
(2020)
Article
Physics, Multidisciplinary
A. Mughal, D. Weaire, S. Hutzler
Summary: Bifurcation diagrams of a compressed chain of hard spheres under the influence of an axial force were studied, showing topological rearrangements due to the reconnection of different equilibrium solutions. The corresponding Peierls-Nabarro potential was defined and calculated for various compression values, providing insights on its general features and relationship to experiments.
Article
Materials Science, Multidisciplinary
A. Irannezhad, D. Weaire, A. Mughal, J. Ryan-Purcell, S. Hutzler
Summary: This study examines the instability and buckling of a linear chain of hard spheres in a transverse harmonic potential. The computational model used is consistent with experimental results obtained from metal spheres in a cylinder.
PHILOSOPHICAL MAGAZINE
(2022)
Article
Materials Science, Multidisciplinary
A. Mughal, S. Hutzler, D. Weaire
Summary: This article introduces the diverse stationary structures of ions trapped in two dimensions under the influence of a harmonic confining potential, and presents a 'bird's-eye' view of these structures for 2 to 5 ions and the full range of anisotropy. The results can be studied in detail using the provided software. The article also identifies energy variations at bifurcation points and limits, including blue-sky (or saddle-node) bifurcations for N = 5. A limited exploration is also conducted for a larger ion system, i.e. N = 10.
PHILOSOPHICAL MAGAZINE
(2023)
Article
Multidisciplinary Sciences
S. Hutzler, J. Ryan-Purcell, A. Mughal, D. Weaire
Summary: A line of contacting hard spheres placed in a transverse confining potential buckles under compression or tilt beyond a critical angle. The displacement profile of transverse spheres can be well described by numerical solutions of a second-order differential equation, approximated by analytic expressions involving Jacobi, Whittaker, and Airy functions. Exact results for the critical tilt without compression are obtained through the analysis in terms of Whittaker functions.
ROYAL SOCIETY OPEN SCIENCE
(2023)
Article
Physics, Fluids & Plasmas
Stefan Hutzler, Adil Mughal, John Ryan-Purcell, Ali Irannezhad, Denis Weaire
Article
Physics, Multidisciplinary
J. Winkelmann, A. Mughal, D. Weaire, S. Hutzler
Article
Physics, Fluids & Plasmas
J. Winkelmann, A. Mughal, D. B. Williams, D. Weaire, S. Hutzler
Article
Physics, Fluids & Plasmas
V. Khodygo, M. T. Swain, A. Mughal
Article
Materials Science, Multidisciplinary
A. Mughal, S. J. Cox, D. Weaire, S. R. Burke, S. Hutzler
PHILOSOPHICAL MAGAZINE LETTERS
(2018)
Article
Physics, Fluids & Plasmas
A. Mughal, J. Winkelmann, D. Weaire, S. Hutzler
Article
Chemistry, Physical
A. Mughal, T. Libertiny, G. E. Schroeder-Turk
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2017)
Article
Physics, Fluids & Plasmas
A. Mughal, D. Weaire
