Article
Engineering, Aerospace
Jaeheung Park, Kyoung Wook Min, Richard W. Eastes, Chi Kuang Chao, Hee-Eun Kim, Junchan Lee, Jongdae Sohn, Kwangsun Ryu, Hoonkyu Seo, Ji-Hyeon Yoo, Seunguk Lee, Changho Woo, Eo-Jin Kim
Summary: This study reports two low-latitude plasma blob events above Africa using two-dimensional Far-UltraViolet (FUV) images from the GOLD mission. The findings show similarities in the characteristics of these plasma blobs to those observed in Central/South America, and highlight the importance of GOLD and multiple LEO satellites in monitoring the ionosphere above Africa.
ADVANCES IN SPACE RESEARCH
(2023)
Article
Chemistry, Physical
Paula Navascues, Martina Buchtelova, Lenka Zajickova, Patrick Rupper, Dirk Hegemann
Summary: This study reveals the influence of diffusion of film forming species and surface reactivity in HMDSO plasmas by studying two different geometries. The results indicate different sticking probabilities of film-forming species and suggest that high-energy particles may contribute to film formation underneath small openings.
APPLIED SURFACE SCIENCE
(2024)
Article
Biochemistry & Molecular Biology
Victoria Yaroshenko, Mikhail Pustylnik
Summary: This study theoretically investigates possible mechanisms of particle attraction for the formation of field-aligned microparticle strings in complex plasmas at elevated gas pressures. Two different approaches to calculating particle interaction energy are discussed, both of which yield energy independent of the operational discharge mode. One approach requires higher gas pressures for particle attraction and string formation, while the other may reconcile theory and observations in the experimentally important pressure range.
Article
Astronomy & Astrophysics
Benjamin Kimock, Desika Narayanan, Aaron Smith, Xiangcheng Ma, Robert Feldmann, Daniel Angles-Alcazar, Volker Bromm, Romeel Dave, James E. Geach, Philip Hopkins, Dusan Keres
Summary: High-redshift Ly alpha blobs (LABs) are a mysterious class of objects studied through observational and theoretical investigations. The dominant power sources for their luminosity include recombination in star-forming galaxies and cooling emission from accretion, with fluorescence caused by active galactic nuclei also contributing significantly. The emergent Ly alpha luminosity from a system is a complex function of the gas temperature, ionization state, and Ly alpha escape fraction.
ASTROPHYSICAL JOURNAL
(2021)
Article
Engineering, Aerospace
Ebenezer Agyei-Yeboah, Paulo Roberto Fagundes, Alexandre Tardelli, Valdir Gil Pillat, Alessio Pignalberi, Venkatesh Kavutarapu, Michael Pezzopane, Francisco Vieira
Summary: This study investigated the occurrence of plasma bubbles and blobs in the near-equatorial region of Brazil using simultaneous observations from all-sky imager system and an ionosonde. The methodology established can identify different plasma bubble and blob cases in ionograms, providing insights into the associated Spread-F signature. The simultaneous OI 630.0 nm nightglow images and ionograms recorded allow for recognition of irregularities in ionograms associated with plasma bubbles and blobs.
ADVANCES IN SPACE RESEARCH
(2021)
Article
Physics, Fluids & Plasmas
W. Ou, F. Brochard, T. W. Morgan
Summary: This study systematically investigated the surface behaviors of liquid tin in different plasma exposures, observing surface instability leading to droplet ejection. The ejection of droplets was found to be dependent on plasma species, flux, and surface temperature, rather than magnetic fields and plasma currents. Bubble formation, growth, and bursting in plasma-species-supersaturated liquid tin was proposed as the primary mechanism for droplet ejection. The application of capillary porous structures could decrease droplet size and production rate, but not completely avoid droplet ejection.
Article
Physics, Fluids & Plasmas
Eshita Joshi, Sergey Khrapak, Christina Knapek, Peter Huber, Daniel Mohr, Mierk Schwabe
Summary: In a complex plasma, microparticles repel each other due to strong negative charges acquired in a low-temperature plasma, but effective attraction can occur through the interplay between plasma ion fluxes and microparticles. Observations of droplets formed in a complex plasma during a parabolic flight were explained by the sustained ion drag force. The experimentally determined droplet size matched well with the theoretical estimate using the ion drag force mechanism, particularly with lower electron temperature values.
CONTRIBUTIONS TO PLASMA PHYSICS
(2021)
Article
Biochemistry & Molecular Biology
Alan Stampini Benhame de Castro, Hauster Maximiler Campos de Paula, Yara Luiza Coelho, Eliara Acipreste Hudson, Ana Clarissa S. Pires, Luis Henrique M. da Silva
Summary: Understanding nonionic surfactant-protein interactions is crucial for both technological and scientific purposes, yet there is a lack of kinetic data. By using surface plasmon resonance (SPR), this study investigated the kinetic and thermodynamic parameters of bovine lactoferrin-Brij58 interactions at different temperatures under physiological conditions. The results showed that the adsorption process was accelerated with increasing temperature, leading to a more thermodynamically stable complex formation. The energetic parameters indicated that the potential energy barrier for complex formation primarily arises from the reduction in system entropy.
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
(2021)
Article
Materials Science, Ceramics
Hongliang Zhang, Ranran Su, Izabela Szlufarska, Liqun Shi, Haiming Wen
Summary: Ti3SiC2 shows better resistance to He irradiation at high temperatures compared to room temperature, with minimal swelling and hardening effects induced by irradiation.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Environmental Sciences
Micheal O. Adebayo, Alexandre A. Pimenta, Siomel Savio, Prosper K. Nyassor
Summary: Through analyzing the OI 630.0 nm emission images taken by the ground-based all-sky imager at ZF-2 in the Amazon region of Brazil, we observed the merging and bifurcation of plasma blobs. The merging of plasma blobs is attributed to the wind reversion effect caused by a change in the direction of the zonal thermospheric wind. Moreover, the activity of the polarized electric field inside the plasma bubble mapping along the magnetic field lines is possibly responsible for the bifurcation of the blobs.
Article
Astronomy & Astrophysics
M. Sten Delos, Simon D. M. White
Summary: Using high-resolution cosmological zoom simulations, this study investigates the early evolution of dark matter haloes and finds that they form density cusps, with step-like folds aligning with the main body of the halo at larger radii. As the haloes grow, the cusps are often overlaid with additional material at intermediate radii, similar to more massive haloes.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Environmental Sciences
Jiajie Chen, Ronglin Li, Shen Xie, Jiaqi Wei, Jian Shi
Summary: Warm blobs are persistent warm seawaters over the Northeast Pacific (NEP) that have significant impacts on marine ecosystems and climate. Recent warm blobs occurred consecutively in the spring and summer of 2021 and 2022, with different locations. Atmospheric processes played a positive and dominant role in the evolution of these warm blobs, but their contribution alone cannot sustain a season. The seasonal persistence is due to the offset between atmospheric and oceanic processes, highlighting the need for further investigation to enhance predictability.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Multidisciplinary Sciences
Yasemin Ozkan-Aydin, Daniel Goldman, M. Saad Bhamla
Summary: The study focused on the dynamics of physically entangled and motile self-assemblies of California blackworms, which form a three-dimensional, soft, and shape-shifting blob capable of mitigating environmental stresses. The research revealed that the collective blob displays rudimentary differentiation of function and facilitates directed persistent locomotion. A robophysical model was developed to demonstrate the emergent locomotion in the collective living material.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Physics, Applied
Kunpeng Wang, Shariful Islam Bhuiyan, Md Abdullah Hil Baky, Jamie Kraus, Christopher Campbell, Howard Jemison, David Staack
Summary: This study presents a model to simulate breakdown in a multiphase system and identifies the primary factor determining breakdown voltage and energy distribution. Under the studied conditions, it is possible to predict breakdown voltage and estimate energy deposition into different phases accurately.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Abdullah Khan, B. M. Alotaibi, A. A. Abid, S. Ali, Y. Al-Hadeethi, M. Ikram, Amin Esmaeili
Summary: The study focuses on the dust grain surface potential in multi-ion plasmas with two negative ions within the context of kappadistributed dusty plasma. Results show that the dust grain surface potential strongly depends on parameters like kappa, density, and temperature ratios. The behavior of dust grain surface potential exhibits non-monotonic trends and is minimally affected by temperature ratios. Considering a variety of Xe+-F- -SF6- and Ar+-F- -SF6- masses is important for the analysis of plasma physics, especially in multicomponent plasmas.
RESULTS IN PHYSICS
(2021)
Article
Physics, Fluids & Plasmas
A. Pikalev, I Semenov, M. Pustylnik, C. Raeth, H. Thomas
Summary: The experiment demonstrates the existence of two qualitatively different void regimes in capacitively-coupled RF complex plasmas, namely the 'bright' void and the 'dim' void. The transition from the dim to the bright regime occurs discontinuously with an increase in discharge power.
PLASMA SOURCES SCIENCE & TECHNOLOGY
(2021)
Article
Physics, Fluids & Plasmas
Eshita Joshi, Sergey Khrapak, Christina Knapek, Peter Huber, Daniel Mohr, Mierk Schwabe
Summary: In a complex plasma, microparticles repel each other due to strong negative charges acquired in a low-temperature plasma, but effective attraction can occur through the interplay between plasma ion fluxes and microparticles. Observations of droplets formed in a complex plasma during a parabolic flight were explained by the sustained ion drag force. The experimentally determined droplet size matched well with the theoretical estimate using the ion drag force mechanism, particularly with lower electron temperature values.
CONTRIBUTIONS TO PLASMA PHYSICS
(2021)
Article
Physics, Fluids & Plasmas
V. Nosenko, S. Zhdanov, M. Pustylnik, H. M. Thomas, A. M. Lipaev, O. V. Novitskii
Summary: Experimental study of heat transport in a three-dimensional complex plasma was conducted on the International Space Station using a PK-4 instrument. Thermal diffusivity and kinematic viscosity of the complex plasma were calculated by analyzing individual particle trajectories in a locally heated suspension of microparticles, with results compared to ground-based experiments.
PHYSICS OF PLASMAS
(2021)
Article
Physics, Fluids & Plasmas
V. N. Naumkin, D. Zhukhovitskii, A. M. Lipaev, A. Zobnin, A. D. Usachev, O. F. Petrov, H. M. Thomas, M. H. Thoma, O. Skripochka, A. A. Ivanishin
Summary: The dust ionization waves (DIWs) excited by an external oscillating electric field have been observed on the Plasma Kristall-4 facility under microgravity conditions. It was found that at the smallest excitation amplitude, the waves are linear, and the dispersion relation can be deduced from the experimental data. The interpretation of DIW assumes that the microparticle effect on the recombination rate is responsible for the wave propagation, and the calculated phase velocity of DIW is compatible with the experimental one.
PHYSICS OF PLASMAS
(2021)
Article
Instruments & Instrumentation
C. A. Knapek, U. Konopka, D. P. Mohr, P. Huber, A. M. Lipaev, H. M. Thomas
Summary: This paper presents a novel plasma chamber, Zyflex chamber, designed specifically for complex/dusty plasma research under reduced gravitational influence. The chamber includes innovations for flexible adjustment of plasma parameters and volume, supporting larger particle systems and operating at lower gas pressures. Experimental results demonstrate the new quality of complex/dusty plasma research made possible with this new plasma device.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2021)
Article
Physics, Fluids & Plasmas
He Huang, Vladimir Nosenko, Han-Xiao Huang-Fu, Hubertus M. Thomas, Cheng-Ran Du
Summary: Machine learning is used to investigate the phase transition of two-dimensional complex plasmas. By simulating particle suspensions and processing images using a Convolutional Neural Network (ConvNet), a phase diagram is obtained.
PHYSICS OF PLASMAS
(2022)
Article
Physics, Fluids & Plasmas
C. A. Knapek, L. Couedel, A. Dove, J. Goree, U. Konopka, A. Melzer, S. Ratynskaia, M. H. Thoma, H. M. Thomas
Summary: Complex plasma is a state of soft matter where micrometer-sized particles are immersed in a weakly ionized gas; direct optical observation of individual particles allows the study of their dynamics; COMPACT is an international facility providing access to the full three-dimensional kinetic properties of particles.
PLASMA PHYSICS AND CONTROLLED FUSION
(2022)
Article
Physics, Fluids & Plasmas
C. A. Knapek, M. Schwabe, V. Yaroshenko, P. Huber, D. P. Mohr, U. Konopka
Summary: The properties of self-excited dust acoustic waves under active compression of the dust particle system were studied experimentally. The wave properties were found to be manipulated by changing the discharge volume and dust particle density. Complementary experiments under microgravity conditions showed the need for a better microgravity environment. Theoretical modeling supported the experimental findings, showing the waves as a new observation of the dust acoustic mode.
PHYSICS OF PLASMAS
(2023)
Article
Physics, Fluids & Plasmas
P. Bajaj, A. Ivlev, C. Raeth, M. Schwabe
Summary: In this experimental paper, we demonstrate the development of turbulence in a fluid system with background damping. By analyzing dust acoustic waves in a fluid complex plasma, we show that a turbulent cascade occurs during the phases of highest particle compression. Additionally, we find that this energy cascade persists despite the presence of a damping force from the background neutral gas.
Article
Physics, Multidisciplinary
E. Joshi, M. Y. Pustylnik, M. H. Thoma, H. M. Thomas, M. Schwabe
Summary: Complex plasmas with suspended microparticles exhibit electrorheological properties, including the formation of stringlike clusters (SLCs). Molecular dynamics simulations were used to mimic the effect of ion flow in experiments, and achieved SLC formation without long-range attractions between particles. The destruction and recrystallization of SLCs were studied experimentally, and showed excellent qualitative agreement with the simulations.
PHYSICAL REVIEW RESEARCH
(2023)
Article
Physics, Fluids & Plasmas
P. Bajaj, S. Khrapak, V Yaroshenko, M. Schwabe
Summary: Research shows that various properties of dust density waves in complex plasmas depend on the position of the microparticle cloud with respect to the plasma sheath, and this finding can be explained in terms of the underlying ion-drift instability. These results are important for a better understanding of the propagation of dust density waves in complex plasmas and in other fields such as astrophysical dusty plasmas.
Article
Physics, Fluids & Plasmas
A. Pikalev, M. Pustylnik, C. Raeth, H. M. Thomas
Summary: The study investigates self-excited and optogalvanically stimulated heartbeat instability in RF discharge complex plasma. The results show that a continuous laser can stabilize microparticle suspension, while a modulated laser induces void contraction. Resonance occurs when the laser modulation frequency matches the frequency of small breathing oscillations of the microparticle suspension.
Article
Physics, Fluids & Plasmas
Xue-Ren Hong, Wei Sun, Mierk Schwabe, Cheng-Ran Du, Wen-Shan Duan
Summary: The paper provides theoretical results explaining experimental observations of solitary wave propagation in a binary complex plasma under microgravity conditions, with a focus on the influence of system parameters on the reflected and transmitted solitary waves at the interface.
Article
Physics, Fluids & Plasmas
S. Mitic, M. Y. Pustylnik, D. Erdle, A. M. Lipaev, A. D. Usachev, A. Zobnin, M. H. Thoma, H. M. Thomas, O. F. Petrov, V. E. Fortov, O. Kononenko
Summary: By analyzing the string-like clusters, it was found that the improvement of string order is accompanied by a decrease in the thickness, number density, and total amount of microparticles in the field of view. This suggests that the observed long-term evolution of string-like order is caused by the redistribution of microparticles.
Article
Physics, Fluids & Plasmas
He Huang, Mierk Schwabe, Hubertus M. Thomas, Andrey M. Lipaev, Cheng-Ran Du
Summary: This study investigates the penetration of a supersonic particle at the interface in a binary complex plasma, based on experiments and Langevin dynamics simulations. The formation of a Mach cone structure and propagation of pulse-like perturbation were observed, with the decay of pulse strength determined by friction. The dynamics of background particles near the interface are dependent on penetration direction, suggesting that mobility disparity might cause various interfacial effects.
