Article
Chemistry, Physical
A. Kubas
Summary: This study focuses on the importance of the electronic coupling matrix element H-AB in electron-transfer theories and its classification and effects under spin-state influences. Through ab initio calculations, conclusions are drawn on topics such as spin-dependent density and density delocalization.
JOURNAL OF CHEMICAL THEORY AND COMPUTATION
(2021)
Article
Mathematics, Applied
Irina Bashkirtseva, Lev Ryashko
Summary: This paper considers the problem of probabilistic analysis of stochastic phenomena in slow-fast dynamical systems modeling biochemical reactions. It studies how multiplicative noise induces systematic shifts of probabilistic distributions and forms phantom attractors in nonlinear enzymatic models. The mathematical analysis of the underlying probabilistic mechanism of such stochastic transformations is performed using the freeze-and-average method. The theoretical results are supported by direct numerical simulation.
Article
Physics, Nuclear
M. Viviani, E. Filandri, L. Girlanda, C. Gustavino, A. Kievsky, L. E. Marcucci, R. Schiavilla
Summary: This study investigates e(+)-e(-) pair production in the four-nucleon system using a state-of-the-art approach derived from chiral effective field theory (chi EFT). The impact of exchanging a hypothetical low-mass boson on the cross section is examined, considering various possibilities. The calculations utilize exact hyperspherical-harmonics methods and provide an overview of potential future experiments in this field.
Article
Materials Science, Multidisciplinary
Paolo Gazzaneo, Tommaso Maria Mazzocchi, Jan Lotze, Enrico Arrigoni
Summary: We study a model of photovoltaic energy collection where a Mott-insulating layer interacts with acoustic phonons and is coupled to two wide-band fermion leads. This system is driven into a nonequilibrium steady state by a periodic electric field. We find that the driving frequency has a peak effect on the photocurrent, which can be attributed to impact ionization processes. The hybridization strength between the layer and the leads affects the suppression of impact ionization. Acoustic phonons slightly enhance the photocurrent at low driving frequencies and suppress it around the main peak at all hybridization strengths.
Article
Engineering, Mechanical
Jeaneth Machicao, Odemir M. Bruno, Murilo S. Baptista
Summary: This paper introduces a method for generating PRNs with low correlation using chaotic maps, enhancing the security of the cryptosystem with minimal computational cost. By applying transformations to chaotic trajectories, the entropy and Lyapunov exponents are significantly increased, leading to a fast, light, and reliable chaos-based cryptosystem.
NONLINEAR DYNAMICS
(2021)
Article
Engineering, Mechanical
Lingfeng Liu, Hongyue Xiang, Xiangjun Li
Summary: A novel perturbation method is proposed in this paper to reduce the dynamical degradation of digital chaotic maps, by perturbing the parameter and state during iteration to prevent the system from entering a cycle. Numerical experiments prove the effectiveness of this method and its ability to improve the dynamical characteristics of original chaotic maps in different scenarios.
NONLINEAR DYNAMICS
(2021)
Article
Physics, Particles & Fields
D. Bason, M. Billo
Summary: We present a diagrammatic procedure for Grassmann integration in N=1 superfields-based 4d theories, as an alternative to the well-known D-algebra approach. The method is developed in detail for theories involving vector, chiral, and anti-chiral superfields, with the same type of interactions found in N=2 SYM theories with massless matter. It can be potentially extended to other cases. The main advantage of this method is its algorithmic nature. We have implemented it as a Mathematica program that directly provides the polynomial produced by the Grassmann integration when given a description of a super Feynman diagram in momentum space.
EUROPEAN PHYSICAL JOURNAL C
(2023)
Article
Materials Science, Multidisciplinary
Chunyi Dong, Karthikeyan Rajagopal, Shaobo He, Sajad Jafari, Kehui Sun
Summary: This paper presents a chaotification method based on the internal perturbation model (IPM) which can be applied to various maps, with further research on integer-order and fractional-order Sine-series maps. IPM method expands parameter space and complexity while maintaining the system's topological structure, validating its effectiveness in digital signal processing.
RESULTS IN PHYSICS
(2021)
Article
Mathematics, Interdisciplinary Applications
Eduardo V. M. Reis, Marcelo A. Savi
Summary: This paper investigates spatiotemporal chaos in a conservative Duffing-type system governed by a partial differential equation with cubic nonlinearity. Numerical simulations demonstrate quasi-periodic and chaotic responses, while an energetic approach provides another strategy for understanding system dynamics.
CHAOS SOLITONS & FRACTALS
(2022)
Article
Physics, Multidisciplinary
Heikki Mantysaari, Bjorn Schenke, Chun Shen, Wenbin Zhao
Summary: We find that exclusive vector meson production at high energy within the color glass condensate framework is highly sensitive to the geometric deformation of the target nucleus at multiple length scales. Different multipole deformation parameters affect different regions of transverse momentum transfer. These results have two important implications: (1) Deformations of nuclear targets must be considered when predicting and interpreting certain observables at the EIC. (2) Differential diffractive vector meson production has the potential to be a powerful tool for directly measuring nuclear structure at different length scales.
PHYSICAL REVIEW LETTERS
(2023)
News Item
Physics, Multidisciplinary
Mohammad W. Ahmed
Summary: Recent measurements of observables related to proton and neutron spin properties at low energies are in disagreement with available theory predictions, posing a challenge to nuclear experimentalists and theorists.
Article
Automation & Control Systems
Jinna Li, Mingwei Yang
Summary: This paper addresses the optimal tracking control problem of singular perturbation systems in industrial processes using off-policy ridge reinforcement learning method and singular perturbation theory. The challenges of different time scales and unknown slow process are overcome by mathematical manipulations and method improvement. Experimental results demonstrate the effectiveness of the proposed method.
Article
Humanities, Multidisciplinary
Agnes Patuano, M. Francisca Lima
Summary: This paper explores the application of fractal concepts in Islamic and Persian garden design, analyzing the Taj Mahal and Isfahan's city plan as case studies. The research demonstrates that these gardens exhibit a high level of self-replication and scale invariance, as well as a high fractal dimension. The fractal characteristics of these gardens may symbolize the infinite divine and principles of fairness and equality.
HUMANITIES & SOCIAL SCIENCES COMMUNICATIONS
(2021)
Article
Chemistry, Physical
Mi Zhang, Hua Hou, Baoshan Wang
Summary: Trifluoromethanesulonyl fluoride (CF3SO2F) has gained much attention as a potential replacement for the environmentally harmful sulfur hexafluoride (SF6) in high-voltage electric applications. The thermal stability and decomposition mechanisms of CF3SO2F were investigated using various computational methods. The findings suggest that CF3SO2F decomposes predominantly through C-S bond cleavage or CF3 migration, leading to the formation of various decomposition products. The results also indicate that CF3SO2F exhibits superior dielectric strength compared to SF6, making it a promising alternative.
JOURNAL OF PHYSICAL CHEMISTRY A
(2023)
Article
Chemistry, Physical
Thijs van Westen, Joachim Gross
Summary: The new first-order perturbation theory provides a near-quantitative description of thermodynamics for simple fluids, with constraints on the actual free energy between lower and upper bounds calculated based on first-order perturbation theory. The theory allows accurate interpolation between low and high densities, with a transferable interpolating function for different intermolecular potential types.
JOURNAL OF CHEMICAL PHYSICS
(2021)
Article
Physics, Fluids & Plasmas
Anton V. Artemyev, Anatoly I. Neishtadt, Alexei A. Vasiliev, Didier Mourenas
JOURNAL OF PLASMA PHYSICS
(2018)
Article
Astronomy & Astrophysics
D. Mourenas, X. -J. Zhang, A. V. Artemyev, V. Angelopoulos, R. M. Thorne, J. Bortnik, A. I. Neishtadt, A. A. Vasiliev
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
(2018)
Article
Physics, Multidisciplinary
Shun Ogawa, Xavier Leoncini, Alexei Vasiliev, Xavier Garbet
Article
Mathematics, Applied
Anton Artemyev, Anatoly Neishtadt, Alexei Vasiliev
PHYSICA D-NONLINEAR PHENOMENA
(2019)
Article
Mathematics, Applied
A. Artemyev, A. A. Vasiliev, A. Neishtadt
COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION
(2019)
Article
Mathematics, Applied
Sergei Yu. Dobrokhotov, Dmitrii S. Minenkov, Anatoly I. Neishtadt, Semen B. Shlosman
REGULAR & CHAOTIC DYNAMICS
(2019)
Article
Mathematics, Applied
Anton V. Artemyev, Anatoly I. Neishtadt, Alexei A. Vasiliev
REGULAR & CHAOTIC DYNAMICS
(2020)
Article
Physics, Fluids & Plasmas
A. V. Artemyev, A. I. Neishtadt, A. A. Vasiliev
PHYSICS OF PLASMAS
(2020)
Article
Astronomy & Astrophysics
A. I. Neishtadt, G. S. Bisnovatyi-Kogan
Article
Physics, Fluids & Plasmas
Anton V. Artemyev, Anatoly I. Neishtadt, Alexei. A. Vasiliev, Xiao-Jia Zhang, Didier Mourenas, Dmitri Vainchtein
Summary: The study explores the Hamiltonian approach for constructing a map of a system with nonlinear resonant interaction, allowing for consideration of multiple resonances and simulation of long-term evolution. The results show that the electron phase space density in the resonant region decreases gradients faster than predicted by quasi-linear theory. Further applications and generalization possibilities are discussed.
JOURNAL OF PLASMA PHYSICS
(2021)
Article
Physics, Fluids & Plasmas
A. Artemyev, A. Neishtadt, A. A. Vasiliev, D. Mourenas
Summary: Resonances with electromagnetic whistler-mode waves play a key role in the dynamics of energetic electron fluxes in space plasma systems. The interaction between electrons and these waves can be either diffusive or nonlinear, with no existing theory quantifying the transition between the two regimes.
Article
Physics, Fluids & Plasmas
A. Artemyev, A. I. Neishtadt, A. A. Vasiliev, V Angelopoulos, A. A. Vinogradov, L. M. Zelenyi
Article
Physics, Fluids & Plasmas
Elias Laribi, Shun Ogawa, Guilhem Dif-Pradalier, Alexei Vasiliev, Xavier Garbet, Xavier Leoncini
