Article
Physics, Fluids & Plasmas
Mehnaz Mostafee Orani, Jhorna Akter, A. A. Mamun
Summary: A theoretical investigation has been conducted to explore the features of ion-acoustic solitary and shock waves in a three-component magnetized plasma. The results show that these waves are significantly modified by various plasma parameters, which is important for understanding nonlinear phenomena in space plasma systems and laboratory devices.
CONTRIBUTIONS TO PLASMA PHYSICS
(2023)
Article
Physics, Fluids & Plasmas
Kil-Byoung Chai
Summary: Self-excited dust acoustic waves (DAWs) with a high phase velocity were observed in a cryogenic dusty plasma experiment. The DAWs were observed in the presence of submillimeter water-ice dust grains that are elongated and fractal-like in shape. The phase velocity of the DAWs ranged from 8 to 15 cm s(-1). The length of the dust grains was measured between 100 and 250 mu m, and the thermal speed of the dust grains ranged from 1.5 to 2.8 cm s(-1). The observed fast phase velocity can be explained by the linear theory taking into account the effect of the dust thermal speed. Possible mechanisms for the high kinetic energies of the submillimeter dust grains are discussed.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2023)
Article
Physics, Multidisciplinary
Lin Mai-Mai, Fu Ying-Jie, Song Qiu-Ying, Yu Teng-Xuan, Wen Hui-Shan, Jiang Lei
Summary: This paper investigates the propagation characteristics of (2 + 1) dimensional nonlinear dust acoustic solitary wave in an unmagnetized hot dusty plasma. The effects of different parameters on the solitary wave solution are discussed using numerical simulation and mathematical software analysis methods.
ACTA PHYSICA SINICA
(2022)
Article
Physics, Fluids & Plasmas
M. M. Orani, Jhorna Akter, A. A. Mamun
Summary: This paper theoretically investigates the oblique propagation of modified ion-acoustic solitary and shock waves in magnetized dusty plasmas. The study finds that different plasma parameters significantly modify the basic features of ion-acoustic nonlinear waves, including amplitude, width, speed, polarity, and obliqueness. The considered plasma system supports compressive solitary and shock waves only. The findings of this investigation are important for interpreting various nonlinear phenomena formed in space environments (such as aurora and Saturn's rings) and laboratory devices (such as tokamaks).
IEEE TRANSACTIONS ON PLASMA SCIENCE
(2023)
Article
Engineering, Chemical
Bin Wu, Xiao-Dan Weng, Naixin Wang, Ming-Jie Yin, Lin Zhang, Quan-Fu An
Summary: This study fabricated novel positively charged polyamide NF membranes with exceptional water permeability and chlorine resistance through surface-initiated ATRP, showing high retentions to heavy metal ions and stability during long-term operation.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Physics, Fluids & Plasmas
A. A. Mamun
Summary: The role of positively charged dust species in the formation of ion-acoustic subsonic solitary waves has been studied in an electron-ion-positively charged dust plasma system. The presence of positively charged dust species reduces the phase speed of the waves, supporting the subsonic solitary waves by reducing the space charge electric field. Applications in space environments where positively charged dust species have been detected are briefly discussed.
CONTRIBUTIONS TO PLASMA PHYSICS
(2021)
Article
Physics, Applied
Curtis Rasmussen, Li Quan, Andrea Alu
Summary: Breaking acoustic reciprocity is crucial for creating robust one-way propagation and unlocking new functionalities for complex systems. Techniques such as nonlinearities, moving media, spatiotemporal modulation, and nonlinear bianisotropy are used to achieve large reciprocity breaking. The recent progress in nonreciprocal surface acoustic wave devices and topological acoustic systems points towards a continued flourishing of these areas in the future.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Physics, Applied
Janghoon Kang, Michael R. Haberman
Summary: This article investigates the spatiotemporal modulation of the surface acoustic admittance of a metasurface diffuser to improve sound diffusion. By using mathematical and finite element models, it demonstrates that the effects of spatial periodicity can be mitigated without introducing aperiodic spacing, thus reducing diffuser thickness and improving the diffusivity of the backscattered field.
APPLIED PHYSICS LETTERS
(2022)
Article
Optics
Suresh Chandra, Suresh Chandra, Mohit Kumar Sharma, Mohit Kumar Sharma
Summary: Dust acoustic waves are sound waves where inertia is provided by heavy charged dust grains and tension is provided by ion and electron pressures, with a much slower phase velocity compared to electron and ion thermal velocities. Theoretical investigations have been conducted on dust acoustic waves, with limited experimental studies. By analyzing basic equations, the excitation of dust acoustic waves in plasmas with negatively charged dust grains by an ion beam was investigated, revealing discrepancies in results compared to other studies.
Article
Physics, Multidisciplinary
Muhammad Bilal, Aman Ur Rehman, Shahzad Mahmood, Muhammad Ahsan Shahzad, Muhammad Sarfraz, Mushtaq Ahmad
Summary: Based on the kinetic theory, this study investigates the dispersion properties and Landau damping rate of dust ion-acoustic waves (DIAWs) in non-thermal dusty plasmas with various physical parameters. The results show that these parameters and the presence of charged dust particles affect the dispersion relation and damping rate. The phase velocity of DIAWs increases with non-thermality, while the damping rate decreases with increasing values of alpha. A comparison of dispersion properties and damping rate is highlighted, and the results are compared with other distributions. This study is important for the application of non-thermal dusty plasmas in space and laboratory environments.
Article
Mechanics
Rasool Barazandeh Kian, Mohammad Hossein Mahdieh
Summary: The propagation of dust acoustic solitary waves (DASWs) in a magnetized dusty plasma comprising of negatively charged dust particles, nonthermal ions and nonthermal electrons was investigated. The Korteweg-de-Vries (K-dV) equation was derived using reductive perturbation method. It was found that the basic structures of DASWs are influenced by nonthermal ions and nonthermal electrons. Both compressive and rarefactive DASWs exist in such dusty plasma. The nonthermality parameter of ions and electrons affects the non-linear wave phase velocity, with ions having a greater effect than electrons. The angle between the external magnetic field and the wave propagation direction strongly influences the amplitude and width of DASWs. The magnetic field only affects the width and not the amplitude of DASWs.
FLUID DYNAMICS RESEARCH
(2023)
Article
Physics, Applied
Peizheng Cao, Wenzhan Ou, Yingnan Su, Yuhang Yin, Erqian Dong, Zhongchang Song, Jiafang Li, Yu Zhang
Summary: In this study, an acoustic switch based on a spiral kirigami metasurface is designed and its performance is evaluated experimentally. The kirigami structure can control the sound propagation range, providing an alternative design strategy for acoustic metasurfaces.
PHYSICAL REVIEW APPLIED
(2022)
Article
Geochemistry & Geophysics
Andrey V. Lebedev
Summary: Acoustic logging is an important experimental technique widely used in exploration geophysics, prone to errors due to microscopic heterogeneity of rocks outside the borehole. Approximate descriptions can be adequate, leading to faster data processing and time savings.
Article
Chemistry, Multidisciplinary
Ying Liu, Jinfeng Kong, Xiangying Bian, Yuping Zhang, Miaozhou Ji, Quan Peng, Jian Jin, Yuzhang Zhu
Summary: In this study, a positively charged poly(piperazinamide) NF membrane was fabricated using surfactant-assembly regulated interfacial polymerization. This membrane showed superior performance in the removal of divalent cations compared to other positive NF membranes.
ADVANCED MATERIALS INTERFACES
(2022)
Article
Mathematics, Interdisciplinary Applications
R. Jahangir, W. Masood, H. Rizvi
Summary: This study investigates the face-to-face interaction of two dust acoustic solitons with adiabatically trapped ions and Maxwellian electrons in a dusty plasma. The results show that the interaction and phase shifts of the solitons cannot be obtained analytically for the trapped case and need to be evaluated numerically. It is found that the phase shift depends on the velocities of the solitons, as well as the number density of electrons and the temperature of ions.
CHAOS SOLITONS & FRACTALS
(2023)
