Article
Physics, Multidisciplinary
Raphael Blumenfeld
Summary: The study introduces a new approach by formulating a well-defined form of the general protocol-independent problem for planar packings of discs and proposing a systematic criterion. It precisely predicts the highest density of random packing while avoiding crystalline and topological order.
PHYSICAL REVIEW LETTERS
(2021)
Article
Physics, Fluids & Plasmas
Jeremie Vasseur, Fabian B. Wadsworth, Eloise Bretagne, Donald B. Dingwell
Summary: This study validates the scaling for fluid permeability in randomly and lattice packed spheres, and identifies the inverse specific surface area as the universal controlling length scale for hydraulic properties.
Article
Astronomy & Astrophysics
Camilo Posada, Jan Hladik, Zdenek Stuchlik
Summary: By studying the dynamical stability of the modified Tolman VII solution, we determined values of the critical adiabatic index for the onset of instability, considering configurations with varying compactness and a. We found that the new models are stable against radial oscillations for a considerable range of values of compactness and the new parameter a, thus supporting their applicability as a physically plausible approximation of realistic neutron stars.
Review
Materials Science, Ceramics
Arnaud Ndayishimiye, Sun Hwi Bang, Christopher. J. Spiers, Clive A. Randall
Summary: This study examines the densification and coarsening mechanisms in cold sintering from the perspective of pressure solution creep. It is found that the cold sintering process of BaTiO3, ZnO, and KH2PO4 ceramic materials follows a similar sequential process as pressure solution creep. The study also suggests that using appropriate transient solvents can lead to advances in densification, microstructural control, and reductions in cold sintering pressure.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
K. Thileep Kumar, S. Raghu, A. M. Shanmugharaj
Summary: Blister packing materials made of foamed plastics are a major environmental concern due to their disposal methods, and the effective recycling of these materials has become a research focus. This study successfully prepared defect-engineered graphene-like turbostratic carbon materials derived from waste plastics and found that they exhibited excellent electrochemical properties and cycling stability when used as anodes for lithium-ion batteries. The research opens up a new pathway for generating value-added carbon materials from blister pack waste.
Article
Energy & Fuels
Jawed Mustafa
Summary: In this study, the cooling simulation of three battery packs in the presence of airflow was examined. It was found that increasing the distance between the battery packs enhances the pressure drop and heat transfer coefficient, while increasing the dimensions of the channel inlet further intensifies these effects.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Mathematics, Applied
Karl Sabelfeld, Anastasya Kireeva
Summary: The Global Random Walk on Spheres (GRWS) algorithm calculates the solution and derivatives of drift-diffusion-reaction equations in any desired set of points simultaneously, significantly reducing computer time compared to standard methods. The stochastic and meshless nature of the method results in a cost independent of space dimension and boundary complexity.
MATHEMATICAL METHODS IN THE APPLIED SCIENCES
(2022)
Article
Geochemistry & Geophysics
Zhi Geng, Audrey Bonnelye, Christian David, Pierre Dick, Yanfei Wang, Alexandre Schubnel
Summary: This study reveals the time-dependent creep behavior and the importance of pressure solution in the sealing mechanism of shale samples through a combination of triaxial compression creep experiments and modeled pressure solution processes in Tournemire shale. The research findings suggest that the pressure solution-induced sealing mechanism is highly active, influencing the creep failure strength and sealing capacity of dolomite-rich shales at middle-shallow depths and thus impacting reservoir fluids transfer and fault gouge strength.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Geochemistry & Geophysics
Jean-Pierre Gratier, Luca Menegon, Francois Renard
Summary: A mechanism involving grain boundary sliding is described for the deformation of fine-grained calcareous shales, which can accommodate large strains of 100%-300% in the Oisans massif in the Western Alps.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2023)
Article
Nanoscience & Nanotechnology
Di Xie, Rui Feng, Peter K. Liaw, Hongbin Bei, Yanfei Gao
Summary: This study investigates the long-term tensile creep behavior of multicomponent equiatomic solid solution alloys with face-centered cubic crystal structures. It is found that dislocation creep is the dominant deformation mechanism for all the alloys studied. Despite variations in room-temperature strength and creep rate, the creep lifetime data for these alloys are similar.
SCRIPTA MATERIALIA
(2022)
Article
Acoustics
Philip L. Marston, Auberry R. Fortuner
Summary: This study examines the estimation of radiation force on large smooth highly reflecting objects in water illuminated by ultrasound beams. The approach extends an experimentally confirmed formula for tilted reflecting surfaces and applies Brillouin's analysis of radiation force on objects to provide a theoretical basis for future experiments.
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2022)
Article
Physics, Multidisciplinary
Alessio Zaccone
Summary: We present an analytical derivation of the volume fractions for random close packing in both 3D and 2D, and compare the derived values with those reported in the literature using different methods. The derivation suggests that random close packing corresponds to the onset of mechanical rigidity and is determined by the coordination number. The article also points out the possibility of achieving volume fractions above the maximum random jammed state by creating some order, with the coordination number at the fcc limit acting as a boundary condition.
PHYSICAL REVIEW LETTERS
(2022)
Article
Materials Science, Ceramics
Yadong Liu, Saipeng Cao, Haoyang Wu, Lin Zhang, Baorui Jia, Mingli Qin, Xuanhui Qu
Summary: Hollow spherical WO3 powder was successfully synthesized via spray solution combustion synthesis (SSCS) method using a mixed solution of ammonium metatungstate, glycine and ammonium nitrate. The effects of fuel ratio, temperature, and precursor solution concentration on the structure and morphology of the powder were investigated, as well as the SSCS mechanism. The optimized conditions resulted in the formation of smooth-surfaced spherical WO3 powder with a median diameter of 24.02 μm, consisting of nanoparticles with a diameter of about 30 nm and a specific surface area of 13.5 m2/g. The as-synthesized WO3 powder exhibited excellent catalytic performance in degrading RhB solution under visible light, with 70.1% degradation achieved within 2 hours using only 10 mg of powder.
CERAMICS INTERNATIONAL
(2023)
Article
Nuclear Science & Technology
Charl G. du Toit, Pierre J. van Loggerenberg, Hendrik J. Vermaak
Summary: The paper evaluates the change in friction factors under different packed bed structures and proposes a new prediction method. It is recommended that future research should further investigate the friction factors of structured packed beds to understand the impact of packing structure on pressure drop.
NUCLEAR ENGINEERING AND DESIGN
(2021)
Article
Materials Science, Multidisciplinary
Apu Sarkar, Saurav Sunil, Bhupendra Kumawat, G. Bharat Reddy, Rajeev Kapoor, Harish Kumar, Vivek Shrivastav
Summary: The creep behavior of a low alloy Mn-Mo-Ni reactor pressure vessel steel in post weld heat treatment condition was studied in the temperature range of 60°C-90°C. The steel exhibited three stage creep behavior, with stress change tests and temperature change tests conducted to determine the creep rates and mechanisms. Analysis of the creep rates using Norton's and Bird-Mukherjee-Dorn creep equations showed dislocation climb as the underlying mechanism, with the formation of a fine subgrain structure observed in the crept sample.
JOURNAL OF NUCLEAR MATERIALS
(2021)