Article
Physics, Multidisciplinary
Giulio Biagioni, Nicole Antolini, Aitor Alana, Michele Modugno, Andrea Fioretti, Carlo Gabbanini, Luca Tanzi, Giovanni Modugno
Summary: Supersolids are a quantum phase of matter where the global phase and translational symmetries are spontaneously broken. By experiment and theory, it has been found that the phase transition of supersolids can be discontinuous or continuous, and the dimensional crossover is controlled by confinement and atom number.
Article
Optics
Marija Sindik, Alessio Recati, Santo Maria Roccuzzo, Luis Santos, Sandro Stringari
Summary: In this study, we investigate quantized vortices in dipolar supersolids at the transition between the superfluid and the supersolid phase. We propose a method for the nucleation and observation of vortices based on the quenching of the s-wave scattering length across the phase transition. Our results show that vortex nucleation occurs as the system enters the supersolid phase due to the reduction of the critical angular velocity. Furthermore, we demonstrate that the created vortex can be preserved and readily observed when the condensate is brought back to the superfluid phase. These findings are of great importance for ongoing experiments as the observation of quantized vortices serves as a key indicator of the superfluid character of dipolar supersolids.
Article
Physics, Multidisciplinary
Chang Woo Myung, Barak Hirshberg, Michele Parrinello
Summary: This study reports computational evidence of a supersolid phase of deuterium under high pressure and low temperature. The researchers observed a highly concerted exchange of atoms while the system maintained its crystalline order, and the Bose-Einstein condensation phenomenon was observed. This study provides concrete evidence for the existence of a supersolid phase in high-pressure deuterium and could contribute to future investigations of supersolid phases in real materials.
PHYSICAL REVIEW LETTERS
(2022)
Article
Multidisciplinary Sciences
Dilara Borte Emiroglu, Aleksandar Bekcic, Dalia Dranseikiene, Xinyu Zhang, Tomaso Zambelli, Andrew J. deMello, Mark W. Tibbitt
Summary: This study investigates the relationship between the macroscopic properties of granular hydrogels and the features of their microgel building blocks using contact mechanics. By studying the mechanics of the microgel packings and modeling the system as a collection of two-body interactions, the researchers were able to accurately describe the rheological properties of the granular hydrogels. These findings provide a rational design framework for improving the engineering of this fascinating class of materials.
Article
Physics, Multidisciplinary
J. Hertkorn, J-N Schmidt, F. Boettcher, M. Guo, M. Schmidt, K. S. H. Ng, S. D. Graham, H. P. Buechler, T. Langen, M. Zwierlein, T. Pfau
Summary: Experimental measurement of density fluctuations across the superfluid-supersolid phase transition provides insight into the static structure factor, spectrum of elementary excitations, and dominant fluctuation patterns. Strong response in static structure factor and presence of a distinct roton minimum in the dispersion relation suggest the presence of roton modes at the quantum critical point in the supersolid state. The study also indicates that the supersolid state supports both superfluid and crystal phonons.
Article
Materials Science, Ceramics
Ashraf A. Abul-Magd, Ahmad S. Abu-Khadra, A. M. Abdel-Ghany
Summary: By incorporating rare-earth oxide La2O3, the structural, mechanical, and optical properties of cobalt-doped heavy metal borate glass have been enhanced, showing improved density, compactness, elasticity, and hardness. The glass materials exhibit semiconductor characteristics with nonlinear optical coefficients, suitable for potential nonlinear optical applications.
CERAMICS INTERNATIONAL
(2021)
Article
Engineering, Geological
Wenbo Liu, Hui Zhou, Shuguang Zhang, Chengwei Zhao
Summary: The MTS815.02 rock test system is used to conduct triaxial compression creep experiments on sandstone, revealing the rheological properties of deep roadway rocks. The improved creep model comprehensively considers instantaneous elastic, non-linear viscoelastic, and viscoplastic strains, and shows high consistency with experimental data. The validity and feasibility of the creep model are verified by comparing the experimental and theoretical curves.
ROCK MECHANICS AND ROCK ENGINEERING
(2023)
Article
Chemistry, Physical
Shaofeng Zhang, Ronggui Liu, Chunhua Lu, Junqing Hong, Chunhong Chen, Jiajing Xu
Summary: The influence of nano-SiO2 (NS) on cement paste and the interfacial transition zone (ITZ) was studied in this research. The results showed that NS could effectively improve the mechanical properties of cement paste and ITZ, but excessive NS content would lead to a decrease in mechanical properties.
Article
Construction & Building Technology
Shaofeng Zhang, Ronggui Liu, Chunhua Lu, Yuan Gao, Jiajing Xu, Lu Yao, Yu Chen
Summary: This paper applies digital image correlation (DIC) technology to measure the thickness and elastic modulus of the interfacial transition zone (ITZ) and discusses the influence of water/cement (w/c) ratio on the ITZ. The results show that DIC technology is feasible for measuring the properties of the ITZ.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Dinesh Kumar Samal, Sonalisa Ray, Hemalatha Thiyagarajan
Summary: The interfacial transition zone (ITZ) in concrete has a significant impact on its properties, but existing studies have simplified the ITZ thickness. This study developed an analytical approach to incorporate non-uniform ITZ thickness and validated it through elastic modulus calculations.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2022)
Article
Mechanics
H. Sam Huang
Summary: This paper conducts a numerical study on the influence of parameters related to cracks and voids on the responses of composites under tension, compression, and shear deformation using the extended finite element method. The results show that changes in crack orientation, fiber orientation, and void distance can affect the stress of composites by varying percentages. In multi-crack composites, the relative crack location plays a significant role in determining the maximum stress. Under different deformations, the dominant crack and its propagation path are crucial in determining the strength of the composites.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Electrical & Electronic
Hongbo Qin, Wei Qin, Wangyun Li, Xu Long
Summary: This study investigated the influence of phase inhomogeneity on the mechanical behavior of microscale Cu/Sn-58Bi/Cu solder joints. It was found that phase inhomogeneity increases stress concentration, and as the Sn58Bi solder matrix transitions from elastic deformation to plastic deformation, the high sigma(eq) zone shifts from the Sn phase to the Bi phase.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Engineering, Mechanical
Romain Lhermerout
Summary: The study performed Y Surface Force Balance (SFB) experiments in a dry atmosphere and across an ionic liquid, revealing that mechanical deformations of surfaces have significant impacts on force measurements. It was found that the contact radius on the ionic liquid can be described by the DMT model, contrary to the conventional belief that SFB experiments are always in the JKR regime. Additionally, the study observed that mica can experience compression in addition to bending, and proposed a modified procedure for calibrating mica thickness in a dry atmosphere. The structural forces measured across the ionic liquid were not described by the usual exponentially decaying harmonic oscillation, suggesting a convolution of surface forces and mechanical response of the solids.
Article
Physics, Fluids & Plasmas
Carlos D. Alas, Christoph A. Haselwandter
Summary: Membrane proteins can deform the surrounding lipid bilayer membrane, and membrane elasticity theory provides a beautiful description of these deformations. We have developed a boundary value method (BVM) that allows for the construction of analytic solutions for protein-induced bilayer deformations, even for proteins with noncircular cross sections. Our BVM shows good agreement with numerical solutions and provides insights into the coupling between protein shape and bilayer thickness deformations.
Article
Chemistry, Physical
Quan Feng, Zhi-jie Li, Xudong Zhang, Feng Wang
Summary: Transition metal silicides are promising materials for high-temperature applications. By using first-principles calculations, the elastic and electronic properties of C40-type NbSi2 disilicides were predicted to improve their brittleness. Six defect models were chosen to evaluate the elastic properties of the transition metal silicides. The introduction of defects and doping models altered their mechanical behavior and led to a transition from brittle to ductile. The Nb defects resulted in the highest degree of anisotropy. The electronic structures were calculated to understand the brittle-to-ductile transition in NbSi2 with defects.
CHEMICAL PHYSICS LETTERS
(2023)
