Article
Physics, Multidisciplinary
Bo Gyu Jang, Minjae Kim, Sang-Hoon Lee, Wooil Yang, Seung-Hoon Jhi, Young-Woo Son
Summary: Using ab initio approaches, we found that the coupling of extended Hubbard interactions to phonons and the intersite Coulomb interaction play important roles in determining the distinctive phases of charge-ordered materials Ba1-xKxAO3 (A = Bi and Sb). By including self-consistently obtained nearest neighbor Hubbard interactions, we were able to account for various experiment features such as breathing instabilities, anomalous phonon dispersions, and the transition between charge-density wave and superconducting states, providing a minimal criterion for reliable descriptions of spontaneous charge orders in solids.
PHYSICAL REVIEW LETTERS
(2023)
Article
Multidisciplinary Sciences
Saminathan Ramakrishnan, Jason R. Stagno, Chelsie E. Conrad, Jienyu Ding, Ping Yu, Yuba R. Bhandari, Yun-Tzai Lee, Gary Pauly, Oleksandr Yefanov, Max O. Wiedorn, Juraj Knoska, Dominik Oberthuer, Thomas A. White, Anton Barty, Valerio Mariani, Chufeng Li, Wolfgang Brehm, William F. Heinz, Valentin Magidson, Stephen Lockett, Mark S. Hunter, Sebastien Boutet, Nadia A. Zatsepin, Xiaobing Zuo, Thomas D. Grant, Suraj Pandey, Marius Schmidt, John C. H. Spence, Henry N. Chapman, Yun-Xing Wang
Summary: Time-resolved crystallography is typically used to monitor small conformational changes within biomacromolecules in the same lattice. This study reveals the interplay between synchronous molecular rearrangements and lattice phase transitions in RNA crystals, laying the foundation for investigating large conformational changes using time-resolved crystallography.
NATURE COMMUNICATIONS
(2021)
Article
Physics, Fluids & Plasmas
David Velasco, Juan M. Lopez, Diego Pazo
Summary: Globally coupled maps (GCMs) are prototypical examples of high-dimensional dynamical systems where an ensemble of weakly coupled identical chaotic units form GCMs typically exhibit hyperchaotic turbulent state. Recent study shows that in turbulent GCMs with positive multipliers, the largest Lyapunov exponent (LE) does not follow the logarithmic relationship as previously predicted, but follows a power-law scaling instead.
Article
Chemistry, Multidisciplinary
Yoshifumi Sasano, Hiroki Tanaka, Yohei Haketa, Yoichi Kobayashi, Yukihide Ishibashi, Tatsuki Morimoto, Ryuma Sato, Yasuteru Shigeta, Nobuhiro Yasuda, Tsuyoshi Asahi, Hiromitsu Maeda
Summary: Charged pi-electronic species were observed to develop stacking structures based on electrostatic and dispersion forces, with the concept of (i)pi-(i)pi Interaction introduced to describe the interactions in these structures. The energy decomposition analysis revealed the importance of electrostatic and dispersion forces in stabilizing the stacking of pi-electronic ions, as observed through crystal-state absorption spectra and transient absorption spectroscopy.
Article
Physics, Multidisciplinary
M. A. Lohe
Summary: This paper investigates scalar field theories in 1+1 dimensions, with N scalar fields that interact through a potential defined by an explicit superpotential. The construction of the superpotential allows for the existence of solitons with multiple minima in the potential. These solitons are described by first-order Bogomolny equations, which have a gradient structure similar to equations arising in synchronization phenomena in complex systems. The paper explores the cases of the sine-Gordon, phi 4, and phi 6 models and shows the existence of solitons and their properties. The study also examines the meson excitations of the system and demonstrates the existence of meson-soliton bound states for a specific mass parameter range in the phi 6 model with N = 3.
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
(2023)
Article
Mathematics, Applied
Li-Dan Liao, Guo-Feng Zhang, Xiang Wang
Summary: This paper introduces a new preconditioned iterative method for nonsymmetric saddle point problems, which avoids solving the inverse of Schur complement, potentially saving costs. The method is supported by theoretical convergence analysis and a practical iteration parameter estimation technique, which have been validated through numerical examples.
COMPUTERS & MATHEMATICS WITH APPLICATIONS
(2021)
Article
Engineering, Biomedical
Umnia Doha, Onur Aydin, Md Saddam Hossain Joy, Bashar Emon, William Drennan, M. Taher A. Saif
Summary: Cells in 3D extracellular matrix (ECM) form a network and initiate the transition from disorder to order, triggering collective behavior. The relationship between cell-cell distance and compaction of collagen gels is revealed, emphasizing the significance of cell-mediated ECM remodeling.
ACTA BIOMATERIALIA
(2022)
Article
Mathematical & Computational Biology
R. Loula, L. H. A. Monteiro
Summary: This article discusses the role of neurotransmitters in modulating mood states and proposes a mathematical model to represent the interaction of three neurotransmitters. The model demonstrates the possibility of Hopf bifurcation, which provides a potential explanation for mood swings observed in depressed individuals.
MATHEMATICAL BIOSCIENCES AND ENGINEERING
(2022)
Article
Physics, Fluids & Plasmas
Yinong Zhao, Thomas Ihle, Zhangang Han, Cristian Huepe, Pawel Romanczuk
Summary: This study investigates a group of self-propelled particle models that achieve collective motion through alignment-based dynamics, analyzing their phase space across a range of parameters. The study compares models with and without repulsive interactions, identifying differences and previously uncharacterized regimes. The results suggest deviations from theoretical predictions may be attributed to remaining inhomogeneities or finite-size effects, providing a comprehensive perspective on the phases and states in alignment-based self-propelled particle models.
Article
Physics, Fluids & Plasmas
Unai Alvarez-Rodriguez, Luka V. Petrovic, Ingo Scholtes
Summary: This paper introduces time-ordered multibody interactions to describe complex systems with both temporal and multibody dependencies. Firstly, it demonstrates how to decompose the dynamics of multivariate Markov chains into ensembles of time-ordered multibody interactions. Then, an algorithm is presented to extract these interactions from data capturing the system-level dynamics of node states, along with a measure to characterize the complexity of interaction ensembles. Finally, the robustness of the algorithm against statistical errors and its efficiency in inferring parsimonious interaction ensembles are experimentally validated.
Article
Multidisciplinary Sciences
Arthur E. B. T. King, Matthew S. Turner
Summary: The collective motion of animal groups often shows velocity-velocity correlations between nearest neighbours, with the strongest correlations observed at the shortest inter-animal spacings. This study found that even when interactions are non-local, the strongest velocity correlations still emerge at the shortest distances.
ROYAL SOCIETY OPEN SCIENCE
(2021)
Article
Engineering, Civil
Xinyi Li, Yinlong Liu, Venkatnarayanan Lakshminarasimhan, Hu Cao, Feihu Zhang, Alois Knoll
Summary: In this paper, a targetless traffic radar calibration method based on GPS is proposed to overcome the inconvenience during ITS operation. A high-precision GPS device installed on the moving vehicle provides accurate positioning information of the detection target. A globally optimal registration method, called Gaussian Mixture Robust Branch and Bound (GMRBnB), is proposed for the optimization process of extrinsic calibration, which is robust to noise and outliers in radar measurements.
IEEE TRANSACTIONS ON INTELLIGENT TRANSPORTATION SYSTEMS
(2023)
Article
Geography, Physical
Yu Li, Mingjun Gao, Zhansen Zhang, Yuxin Zhang, Simin Peng
Summary: Spatial-temporal scales effects are common in human-nature interactions, but the laws and mechanisms of these interactions at different scales remain unknown. A comprehensive dataset of the Hexi Corridor in Northwest China, covering changes in environments, population, wars, famines, settlements, and ancient oases from the Neolithic to the historic period, was analyzed. The study shows that humans adapt to climate change on a millennium scale by choosing appropriate production methods. On shorter scales, environmental change, civilization evolution, dynasty replacement, and social crises are closely interconnected. Similar time scale effects are observed in major ancient civilizations worldwide.
JOURNAL OF GEOGRAPHICAL SCIENCES
(2023)
Article
Mathematics, Applied
Vladimir Fanaskov
Summary: This paper advocates for the use of deterministic inference in numerical linear algebra problems, specifically in solving linear systems. It demonstrates how Gaussian belief propagation solver, originally designed for symmetric matrices, can be adapted for nonsymmetric matrices. By introducing a new matrix inversion algorithm and relating it to LU and block LU decompositions, along with certain guarantees based on belief propagation theory, competitive solvers, smoothers, and preconditioners can be constructed for selected elliptic test problems.
SIAM JOURNAL ON SCIENTIFIC COMPUTING
(2022)
Article
Physics, Multidisciplinary
Su-Juan He, Wei Zou
Summary: This paper investigates three typical collective behaviors in globally coupled Stuart-Landau limit-cycle systems under mean-field feedback: incoherence, amplitude death, and locked states. The critical condition for the transition from incoherence to synchronization is obtained, and it is found that the synchronization transition occurs at a smaller coupling strength when the strength of mean-field feedback is gradually enhanced. The stable regions of amplitude death and the existence of locked states are also analyzed. The results reveal the key role of mean-field feedback in controlling the collective dynamics of coupled nonlinear systems.
ACTA PHYSICA SINICA
(2023)
Editorial Material
Chemistry, Physical
Giacomo Gradenigo, Roberto Trozzo, Andrea Cavagna, Tomas S. Grigera
JOURNAL OF CHEMICAL PHYSICS
(2016)
Article
Physics, Multidisciplinary
Thierry Mora, Aleksandra M. Walczak, Lorenzo Del Castello, Francesco Ginelli, Stefania Melillo, Leonardo Parisi, Massimiliano Viale, Andrea Cavagna, Irene Giardina
Article
Physics, Multidisciplinary
Andrea Cavagna, Daniele Conti, Chiara Creato, Lorenzo Del Castello, Irene Giardina, Tomas S. Grigera, Stefania Melillo, Leonardo Parisi, Massimiliano Viale
Article
Computer Science, Artificial Intelligence
Andrea Cavagna, Stefania Melillo, Leonardo Parisi, Federico Ricci-Tersenghi
Summary: The algorithm represents each target as a 3D cloud of points, introduces a cost function to handle occlusions, and minimizes the cost function using a specific semi-definite optimization technique to address identity recognition and trajectory tracking issues.
IEEE TRANSACTIONS ON PATTERN ANALYSIS AND MACHINE INTELLIGENCE
(2021)
Article
Engineering, Aerospace
Andrea Cavagna, Massimo Cencini, Stefania Melillo, Leonardo Parisi, Fabrizio Piergentili, Fabio Santoni, Alessandro Sozza
Summary: As the space economy continues to grow and the number of space objects increases, Space Surveillance and Space Traffic Management play a crucial role in reducing the risks of in-orbit collisions and damages on Earth. Ground based optical observations using cameras coupled with telescopes are essential for monitoring and tracking space debris. Multi-site optical observations, matching images from different cameras to obtain 3D positions of space objects, are particularly convenient for tracking uncontrolled Earth re-entry and close approaches.
Article
Physics, Multidisciplinary
Andrea Cavagna, Luca Di Carlo, Irene Giardina, Tomas S. Grigera, Stefania Melillo, Leonardo Parisi, Giulia Pisegna, Mattia Scandolo
Summary: By using the renormalization group, the dynamical critical exponent of natural swarms of insects is calculated, and a new fixed point is discovered. The critical exponent at the new fixed point is consistent with both experiments and numerical simulations, indicating the power of the renormalization group in describing collective behavior.
Article
Engineering, Electrical & Electronic
Andrea Cavagna, Xiao Feng, Stefania Melillo, Leonardo Parisi, Lorena Postiglione, Pablo Villegas
Summary: The article introduces a comoving camera system CoMo, consisting of two synchronized cameras and rotational stages, which allows for dynamic tracking of target flock motion. The system addresses calibration of external parameters, measures 3D distances, and achieves a relative error of approximately 1% in 3D tests. The novel approach used in the tests is also highlighted as a powerful tool for detecting and fixing calibration inaccuracies.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2021)
Article
Engineering, Aerospace
Fabrizio Piergentili, Gaetano Zarcone, Leonardo Parisi, Lorenzo Mariani, Shariar Hadji Hossein, Fabio Santoni
Summary: The increase in space activities has brought the issue of space debris to the forefront, requiring optical systems for identifying and monitoring uncontrolled objects. This article focuses on monitoring and predicting the re-entry phase of objects.
Proceedings Paper
Engineering, Aerospace
Lorenzo Mariani, Gaetano Zarcone, Andrea Delfini, Marco Acernese, Shariar Hadji Hossein, Leonardo Parisi, Federico Curiano, Fabio Santoni, Fabrizio Piergentili
2020 IEEE 7TH INTERNATIONAL WORKSHOP ON METROLOGY FOR AEROSPACE (METROAEROSPACE)
(2020)
Article
Biochemistry & Molecular Biology
Andrea Cavagna, Daniele Conti, Irene Giardina, Tomas S. Grigera, Stefania Melillo, Massimiliano Viale
