Article
Engineering, Multidisciplinary
M. Bednarik, M. Cervenka
Summary: This study explores the acoustic field inside a rectangular cross-section sonic black hole (SBH) and presents a one-dimensional model equation. The model equation's applicability is verified through comparison with the corresponding two-dimensional Helmholtz equation. A general analytical solution, taking into account the SBH's quadratically varying internal cross-section, is derived using linearly independent confluent Heun functions. The study investigates the acoustic wave behavior in the SBH using the wave splitting method and calculates the reflection coefficient. The validity of the analytical solution is confirmed through comparison with numerical results obtained from the Riccati equation.
APPLIED MATHEMATICAL MODELLING
(2024)
Article
Chemistry, Physical
Yikai Liao, Sang-Ho Shin, Munho Kim
Summary: This paper presents a 4H-SiC porous nanoscale periodic hole array with outstanding ultraviolet antireflection capability prepared by highly efficient plasma-free photon-enhanced metal-assisted chemical etching. The formation process is carefully monitored and the etching mechanism is explained by carrier generation and mass transport. The effect of pattern dimension on etching is also investigated.
APPLIED SURFACE SCIENCE
(2022)
Article
Physics, Applied
Xiao-gang Yin, You-wen Liu, Cheng-ping Huang
Summary: This paper investigates a highly symmetric all-metallic metamaterial and demonstrates that high Q-factor trapped mode resonances can be achieved by weakly asymmetric metamolecules. The resonant effect is attributed to the destructive interference between anti-phased excitations, with the hole separation greatly affecting the coupling and radiation.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Yongliang Chen, Chi Li, Tieshan Yang, Evgeny A. Ekimov, Carlo Bradac, Son Tung Ha, Milos Toth, Igor Aharonovich, Toan Trong Tran
Summary: All-optical nanothermometry is a powerful tool for measuring nanoscale temperatures in various applications. This study presents a real-time nanothermometry technique using codoped nanodiamonds with high sensitivity and resolution. The technique utilizes temperature sensors that emit spectrally separated fluorescence signals and a parallel detection scheme for fast readout. The method is demonstrated by monitoring temperature changes in microcircuits and MoTe2 field-effect transistors.
Article
Multidisciplinary Sciences
Sarah Hirthe, Thomas Chalopin, Dominik Bourgund, Petar Bojovic, Annabelle Bohrdt, Eugene Demler, Fabian Grusdt, Immanuel Bloch, Timon A. Hilker
Summary: In this study, the experimental method of quantum gas of ultracold atoms was used to observe hole pairing phenomenon caused by magnetic correlations in a doped antiferromagnetic ladder system with mixed-dimensional couplings. The results showed that magnetic correlations can significantly increase the binding energy of holes and reduce the pair size, allowing holes to predominantly occupy the same rung of the ladder. It was also found that spatial structures in the pair distribution appeared with increased doping, indicating repulsion between bound hole pairs. By engineering a configuration to enhance binding, a strategy to increase the critical temperature for superconductivity was outlined.
Article
Chemistry, Multidisciplinary
Daniel N. Shanks, Fateme Mahdikhanysarvejahany, Christine Muccianti, Adam Alfrey, Michael R. Koehler, David G. Mandrus, Takashi Taniguchi, Kenji Watanabe, Hongyi Yu, Brian J. LeRoy, John R. Schaibley
Summary: The research team used a nanopatterned graphene gate to create a sharply varying electric field near a MoSe2-WSe2 heterostructure, forming a trap capable of capturing single excitons. This method demonstrates the potential for deterministic placement and control of IXs, providing new insights for scalable quantum technologies.
Article
Mechanics
M. Klevs, M. Birjukovs, P. Zvejnieks, A. Jakovics
Summary: This study demonstrates the first application of dynamic mode decomposition (DMD) to bubble flow with resolved dynamic liquid/gas boundaries. By examining the velocity field mode statistics over trajectory time and total flow time, as well as computed mode velocity fields, the study shows how gas flow rate and applied magnetic field affect bubble wake flow and larger-scale flow structures within the liquid metal vessel. The results suggest that DMD can provide unique insights into various momentum transfer and bubble interaction mechanisms, and that mode analysis can be used to explain observed flow patterns, showcasing an implementation of DMD with resilience to data noise, memory efficiency, and special pre-processing for input data.
Article
Engineering, Multidisciplinary
Ting Han, Jianchun Fan
Summary: Metal-to-metal seals are crucial in oil and gas well tubing and casing connections, thus the measurement and evaluation of sealing integrity is important. This study investigates the contact stress at rough interfaces using a quantitative ultrasonic method, establishing a two-dimensional model and empirical fitting formula for contact stress. The accuracy of the formula is verified through experimental results, serving as a reference for measuring and quantifying metal-to-metal contact stress.
Article
Nanoscience & Nanotechnology
Dan Wang, Zhijian Zhao, Bo Shi, Jie-Xin Wang, Jian-Feng Chen
Summary: The pyrolysis of MOFs is a widely used method to generate hierarchical structures with metal nanoparticles embedded in a porous carbon matrix. In this study, in situ environmental transmission electron microscopy was used to observe the real-time formation and evolution of porous carbon decorated with metal species during the pyrolysis of zeolitic imidazolate framework-67 encapsulated with carbon dots. The migration of cobalt, the flow of aggregates, and the growth of carbon nanotubes were observed at the nanoscale. Experimental studies revealed the synergistic effect between doped graphite nitrogen and confined cobalt nanoparticles for enhanced catalytic performance.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Multidisciplinary Sciences
Nikita Kavokine, Marie-Laure Bocquet, Lyderic Bocquet
Summary: This study develops a quantum theory of the solid-liquid interface, revealing a new contribution to friction due to the coupling of charge fluctuations in the liquid to electronic excitations in the solid. The research demonstrates a marked difference in quantum friction between the water-graphene and water-graphite interface, potentially explaining the radius-dependent slippage of water in carbon nanotubes.
Article
Mechanics
Tomas Gandara, Ernesto Castillo Del Barrio, Marcela Cruchaga, Joan Baiges
Summary: This study analyzed the two-dimensional sloshing of water in a stepped based tank using a numerical model and validated it with experimental results. The comparison included wave height at different control points and snapshots of free surface evolution at different frequencies. Further examination was conducted on the effects of frequency, step height, fluid volume, and fluid viscosity on wave dynamics.
Article
Construction & Building Technology
J. Malet, M. Radosavljevic, M. Mbaye, D. Costa, J. Wiese, E. Gehin
Summary: This paper studies the effect of singularities on flow in an industrial-scale rectangular ventilation network. The results show that the singularities significantly impact the velocity profiles and flow distribution.
BUILDING AND ENVIRONMENT
(2022)
Article
Physics, Multidisciplinary
Ranjan Kumar Patel, Krishnendu Patra, Shashank Kumar Ojha, Siddharth Kumar, Sagar Sarkar, Akash Saha, Nandana Bhattacharya, John W. Freeland, Jong-Woo Kim, Philip J. Ryan, Priya Mahadevan, Srimanta Middey
Summary: This study investigates the effect of Ca doping on the electronic structure of NdNiO3 thin films, highlighting the importance of bond disproportionation in the observed properties.
COMMUNICATIONS PHYSICS
(2022)
Article
Mathematics
Ildiko Renata Szava, Daniela Sova, Dani Peter, Pavel Elesztos, Ioan Szava, Sorin Vlase
Summary: Based on Szirtes' modern dimensional analysis (MDA), the authors validate the applicability of the theory to a real structure through experimental measurements. By designing prototypes and models at different scales, and comparing the measurement data with the model law, the authors successfully validate the laws in this study.
Article
Chemistry, Multidisciplinary
Madisen Holbrook, Yuxuan Chen, Hyunsue Kim, Lisa Frammolino, Mengke Liu, Chi-Ruei Pan, Mei-Yin Chou, Chengdong Zhang, Chih-Kang Shih
Summary: The ability to engineer lateral junctions at the nanoscale in atomically thin materials is crucial for future 2D device technology. This study demonstrates the synthesis of a nanoscale lateral junction in monolayer MoSe2 by intercalating Se, which creates a large built-in potential and modifies the band profile. The findings suggest that environmental proximity engineering provides a robust method for manipulating the band profile of 2D materials.
