Article
Engineering, Ocean
Z. R. Shu, P. W. Chan, Q. S. Li, X. H. He, C. Z. Cai
Summary: This study aims to examine the complexity of underlying dynamics of various ocean data using nonlinear time series analysis techniques, and validates the potential of these techniques for characterizing ocean data variability. One-year data from an offshore platform and two-year data from a weather buoy were collected and analysed, and the results indicate that all the ocean data considered here exhibit chaotic characteristics in the reconstructed phase space. The surface currents speed shows the highest fractal dimension and correlation dimension, while the significant wave height has the lowest values, suggesting that the dynamics associated with surface currents speed tend to be the most complex.
APPLIED OCEAN RESEARCH
(2023)
Article
Astronomy & Astrophysics
M. Falanga, I. Aquino, E. De Lauro, S. Petrosino, C. Ricco
Summary: The behavior of the dynamical system in Campi Flegrei volcanic caldera became collective in the second half of 2020, showing significant deviations from the background trend of ground deformation. A series of 15 slow tilt variations associated with a very low-dimensional system, likely generated by a local second-order source, were observed. The effects of the local, second-order stress field were evident in the volcanic dome of Mt. Olibano, measured as tilt steps.
EARTH AND SPACE SCIENCE
(2023)
Article
Computer Science, Interdisciplinary Applications
P. R. L. Alves
Summary: This paper presents an analysis of the underlying dynamics of stock markets in North America, Europe, and Asia using a reconstruction methodology. The impact of the pandemic on different stock markets is evaluated and compared using scatter plots, histograms, and Spearman correlation coefficients.
MATHEMATICS AND COMPUTERS IN SIMULATION
(2022)
Article
Mathematics, Applied
Luana Santana, Rafael M. da Silva, Holokx A. Albuquerque, Cesar Manchein
Summary: By conducting extensive numerical experiments on two electrically interacting FitzHugh-Nagumo (FHN) neurons, we investigated the presence of chaotic and regular dynamics, transient chaos phenomenon, and multistability in parameter space. Our findings include the existence of self-organized stable periodic structures, transient chaos phenomenon causing long chaotic temporal evolution, and various multistable domains with an arbitrary number of attractors. Additionally, we demonstrated that chaos, transient chaos, and multistability persist even with different coupling strengths between identical FHN neurons.
Article
Engineering, Civil
Zhenru Shu, Mike Jesson, Mark Sterling
Summary: Proper understanding of rainfall variability is crucial for meteorological and hydrological modelling. This study found that there is chaos in UK rainfall data, with varying complexity in rainfall dynamics across different regions. The analysis also revealed marked long-term variability in rainfall dynamics in Western and Northern Scotland.
JOURNAL OF HYDROLOGY
(2021)
Article
Multidisciplinary Sciences
Nitin Dubey, Joseph Rosen
Summary: Interferenceless coded aperture correlation holography (I-COACH) is a coherent digital holographic technique with lateral and axial resolution similar to a regular lens-based imaging system. This study explores the imaging capabilities of different point spread holograms (PSHs), such as continuous, dot-based, and sparse island-shaped PSHs, using parameters such as visibility, signal-to-noise ratio (SNR), and the product of visibility with SNR.
SCIENTIFIC REPORTS
(2022)
Article
Mathematics, Interdisciplinary Applications
Maria-Alexandra Paun, Vladimir-Alexandru Paun, Viorel-Puiu Paun
Summary: SEM microfractographies of Zircaloy-4 were analyzed using fractal analysis and the time-series method. A computer application was developed to associate fractal dimension and lacunarity with each SEM micrograph, and non-linear analysis was performed on the quantitatively evaluated time series data. By utilizing the phase space-embedding technique to reconstruct the attractor and compute the autocorrelation dimension, the fracture surface of Zircaloy-4 samples was studied. The fractal analysis method effectively highlighted damage complications and provided a description of various fracture morphological parameters through calculation of fractal dimension and lacunarity.
FRACTAL AND FRACTIONAL
(2022)
Article
Mechanics
Xuze Wu, Yu Sun, Yu Wang, Yu Chen
Summary: The study depicted the system dynamics of a planar slider-crank mechanism with multiple clearance joints using correlation dimension and bifurcation actions, investigating the effects of clearance size and driving speed on the bifurcations of the dynamic response and identifying the fractal dimension of the strange attractor. The controlled factors in the evaluation of correlation dimension were cautiously determined using the Cao method, Mutual Information function, and Grassberger-Procaccia algorithm. The compound effect of translational and revolute clearance joints on the mechanism dynamics was featured, showing that the correlation dimension of the slider displacement approximately saturates beyond a specific translational clearance value.
MULTIBODY SYSTEM DYNAMICS
(2021)
Article
Physics, Multidisciplinary
Tosif Ahamed, Antonio C. Costa, Greg J. Stephens
Summary: The authors use a data-driven framework based on the theory of dynamical systems to characterize nematode behavior and explain its complexity through deterministic chaotic dynamics. They find both basic stereotyped movements and locally unstable dynamics with signatures of deterministic chaos in the behavior of the roundworm. The presence of positive Lyapunov exponents and a symmetric Lyapunov spectrum suggests that the worm's movement control is driven by damped-driven Hamiltonian dynamics.
Article
Mathematics, Applied
Anna Krakovska, Stefan Pocos, Karolina Mojzisova, Iveta Betkova, Jakub Xaver Gubas
Summary: The study aimed to determine the best reconstruction method when the quality of prediction of the studied observable is the criterion. Different reconstruction methods were tested, and it was found that the numerical estimates were almost the same, but the prediction results were significantly influenced by the type of reconstruction.
COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION
(2022)
Article
Computer Science, Interdisciplinary Applications
Ning Liu, Zhong Su, Qing Li, Hui Zhao, Wenhao Qi
Summary: This paper introduces the research progress and application fields of MEMS vibratory gyroscopes, and proposes a random noise suppression method based on nonlinear filtering. After analysis and verification, this method shows significant advantages in high-precision applications.
JOURNAL OF INDUSTRIAL INFORMATION INTEGRATION
(2022)
Article
Engineering, Mechanical
Shi Hui Lang, Hua Zhu, Guo Dong Sun, Yu Jiang, Chun Ling Wei
Summary: Several pairs of algorithms were used to determine the phase space reconstruction parameters for analyzing chaotic time series. The study found that the false nearest neighbor method and the complex autocorrelation method provided the best results. A saturated embedding dimension method based on the saturated correlation dimension method was proposed to calculate the time delay.
JOURNAL OF COMPUTATIONAL AND NONLINEAR DYNAMICS
(2022)
Article
Electrochemistry
Xianmiao Zhang, Zhijian Luo, Cuijiao Liao
Summary: In this study, various analysis methods were used to investigate the nonlinear dynamics behavior of electrochemical dissolution of Ti-48Al-2Cr-2Nb alloy at high applied potentials. The results showed that the corrosion behavior of the alloy varied with the applied potential, with higher potentials resulting in smoother surfaces and lower potentials leading to rougher surfaces.
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
(2023)
Article
Physics, Multidisciplinary
Alec Cao, Roshan Sajjad, Hector Masi, Ethan Q. Simmons, Jeremy L. Tanlimco, Eber Nolasco-Martinez, Toshihiko Shimasaki, H. Esat Kondakci, David M. Weld, Victor Galitski
Summary: This study experimentally realizes a pulsed quantum rotor ensemble with tunable interactions and observes a clear breakdown of dynamical localization. The resulting dynamics display sublinear anomalous diffusion and echo-type time-reversal experiments establish the role of interactions in destroying reversibility. This research advances our understanding of many-body quantum chaos and quantum anomalous diffusion, with implications for the protection of quantum information in interacting driven systems.
Article
Materials Science, Multidisciplinary
Cynthia Martinez-Ramos, Javier Olguin-Coca, Luis Daimir Lopez-Leon, Citlalli Gaona-Tiburcio, Maria Lara-Banda, Erick Maldonado-Bandala, Ivan Castaneda-Robles, Jesus Jaquez-Munoz, Jose Cabral-Miramontes, Demetrio Nieves-Mendoza, Facundo Almeraya-Calderon
Summary: This study characterizes the electrochemical behaviors of anodized aluminum alloys and evaluates their corrosion resistance in different environments. The results indicate that the alloys exhibit mixed corrosion and localized corrosion in specific zones.
Article
Chemistry, Physical
Zhong Wu, Jingyun Chen, Qifeng Li, Da-Hai Xia, Yida Deng, Yiwen Zhang, Zhenbo Qin
Summary: By modifying the bonding between graphene and Fe3O4, a magnetic graphene-Fe3O4 nanostructured composite was obtained, which could be orientated in an epoxy resin matrix under a magnetic field induction. The study found that the thermal conductivity of the composites was highest at a mass ratio of 2:1, and they exhibited good thermal stability and electrical insulation properties.
Article
Materials Science, Multidisciplinary
Qifeng Li, Zhenbo Qin, Jingyun Chen, Da-Hai Xia, Yida Deng, Yiwen Zhang, Zhong Wu, Wenbin Hu
Summary: The study shows that the Gr/Cu composite film with a layered structure achieved through layering electrodeposition method significantly enhances the strength compared to pure Cu film. The influence of electrodeposition time on the distribution structure of Gr layer was also investigated in this study.
Article
Metallurgy & Metallurgical Engineering
Zhong Wu, Qing Hu, Zhenbo Qin, Yiwen Zhang, Da-Hai Xia, Wenbin Hu
Summary: The study investigated the effects of plastic deformation on the mechanical strength and corrosion resistance of Nickel-aluminum bronze (NAB) alloys in a 3.5% NaCl solution. The results showed that plastic deformation significantly improved the microhardness and yield strength of NAB, but led to a decrease in corrosion resistance during long-term immersion corrosion. This was attributed to higher internal stress in the corrosion product film caused by larger plastic deformation, resulting in premature film peeling and loss of protective effects on the alloy substrate.
ANTI-CORROSION METHODS AND MATERIALS
(2021)
Article
Chemistry, Physical
Yuting Lv, Jiawei Guo, Guosong Zhang, Lianmin Cao, Xueyan Sun, Zhenbo Qin, Da-Hai Xia
Summary: This study investigated the electrical properties of corrosion protective film of each phase in as cast NiAl bronze alloy and its effect on selective phase corrosion behavior in different NaCl salt solutions based on pH levels. The results showed that pH 3.5 led to the best corrosion resistance, while below and above 3.5 exhibited completely different SPC behavior.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Metallurgy & Metallurgical Engineering
Zhenbo Qin, Xuehan Li, Da-Hai Xia, Yiwen Zhang, Zhong Wu, Wenbin Hu
Summary: This paper aims to clarify the effect of compressive stress on cavitation-erosion corrosion behavior of 304 stainless steel. The experimental results showed that increasing compressive stress can reduce the cavitation weight loss of 304 stainless steel. The reason behind this is that compressive stress promotes deformation-induced martensitic transformation, providing cushioning effect and improving the hardness of 304 stainless steel.
ANTI-CORROSION METHODS AND MATERIALS
(2022)
Article
Engineering, Mechanical
Cheng-Man Deng, Yu Zhu, Shengkai Sun, Junsheng Wei, Da-Hai Xia
Summary: This study investigated the blushing phenomenon on epoxy-phenolic coated tinplate after boiling sterilization, revealing poor corrosion resistance and coating adhesion as the main causes for underfilm corrosion and coating disbondment.
ENGINEERING FAILURE ANALYSIS
(2022)
Article
Chemistry, Physical
O. J. Ramos-Negron, R. F. Escobar-Jimenez, J. H. Arellano-Perezb, J. F. Gomez-Aguilar, Da-Hai Xia
Summary: This study focused on the corrosion analysis of aluminum alloy using ethanol-gasoline blends and proposed an alternative signal processing method, the Stockwell Transform (ST). The results showed varying corrosion levels in the aluminum alloy exposed to different concentrations of ethanol-gasoline blends.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Review
Materials Science, Multidisciplinary
Da-Hai Xia, Cheng-Man Deng, Digby Macdonald, Sina Jamali, Douglas Mills, Jing-Li Luo, Michael G. Strebl, Mehdi Amiri, Weixian Jin, Shizhe Song, Wenbin Hu
Summary: This article reviews the application of electrochemical methods, virtual instrumentation, and advanced sensors/probes in the assessment of corrosion damage. It presents typical corrosion monitoring results obtained in different environmental conditions and discusses detection methods, data analysis, theoretical and mathematical models for each corrosion system. Challenges, issues, and possible solutions are suggested. Future developments, such as wireless, intelligent, and automatic electrochemical measurement, are summarized.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Kaiqiang Li, Xincheng Li, Yubin Zhao, Kangchen Wang, Shenyou Song, Wenliang Jin, Dahai Xia, Yunze Xu, Yi Huang
Summary: This study designed a partial pre-rusted wire beam electrode to investigate the influence of the rust layer on rebar corrosion. The results demonstrate that the rust layer plays a more crucial role in inhibiting chloride-induced corrosion and greatly accelerates the growth of pitting corrosion.
Article
Materials Science, Multidisciplinary
Yuanyuan Ji, Yingchang Mao, Lihua Dang, Da-Hai Xia, Wenbin Hu
Summary: The localized corrosion behavior of AA 5083-H111 in 3.5 wt-% NaCl solution was investigated using SEM, FIB, and TEM techniques. It was found that Ti-rich IMPs acted as cathodes, leading to the dissolution of neighboring Al matrix and the formation of a trench. Raised 'circles' observed on the alloy surface were identified as cathodic regions where corrosion products were deposited. In the sub-surface region beneath the raised 'circle' area, fine Al grains and corroded Al-Mg phases were observed.
CORROSION ENGINEERING SCIENCE AND TECHNOLOGY
(2023)
Editorial Material
Materials Science, Multidisciplinary
Yunze Xu, Da-Hai Xia, Jian Zhang, Gang Liu
Article
Materials Science, Multidisciplinary
Da-Hai Xia, Yuanyuan Ji, Ruifeng Zhang, Yingchang Mao, Yashar Behnamian, Wenbin Hu, Nick Birbilis
Summary: Localized corrosion of aluminium alloy AA5083-H111 was studied in both a simulated dynamic seawater/air interfacial zone and a full seawater immersion zone using electrochemical impedance spectroscopy and electrochemical noise. Investigation of Al-Fe/Ti intermetallic particles (IMPs) on localized corrosion was conducted with focused ion beam, transmission electron microscopy, and energy dispersive X-ray spectroscopy. Compared to the full immersion zone, the interfacial zone exhibited higher oxide film resistance and charge transfer resistance, attributed to the elevated oxygen flux in that zone. The localized corrosion was found to originate from IMPs containing an Al-Fe phase and a Ti enriched phase.
Article
Electrochemistry
Yuanyuan Ji, Qian Hu, Da-Hai Xia, Jing-Li Luo
Summary: The corrosion characteristics of passive films on 1060, 2024 and 5083 aluminum alloys formed in citric acid solution are studied. The passive film on 1060 pure Al has the best corrosion resistance, while the presence of alloying elements reduces the corrosion resistance of the passive films on 2024 and 5083 Al alloys. Cu/Mg doping α-Al2O3 surfaces exhibit different corrosion resistances compared to pure α-Al2O3 (110) surface due to changes in Cl adsorption behavior.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2023)
Article
Materials Science, Multidisciplinary
Yusu Tang, Dinglei Geng, Zhihao Cheng, Xin Han, Liying Han, Jinfeng Zhang, Dahai Xia, Jie Liu
Summary: A facile and surfactant-free electrochemical synthesis method was used to produce PtIr nanocubes as highly efficient Pt-based metal catalysts. The obtained PtIr nanocubes exhibited outstanding specific activity (SA) values, which were 1.5 and 3.8 times higher than Pt nanocubes and PtIr nanospheres, respectively. This study provides an effective strategy for the green synthesis of high-efficiency Pt-based metal catalysts with controllable shapes.
Article
Materials Science, Multidisciplinary
Cheng-Man Deng, Da-Hai Xia, Ruifeng Zhang, Yashar Behnamian, Wenbin Hu, Nick Birbilis
Summary: The effect of wetting time on localized corrosion of AA5083-H111 aluminum alloy in a dynamic seawater/air interface zone was investigated. Longer wetting time resulted in a more serious localized corrosion degree and thus led to an uneven and incomplete corrosion product film. This was attributed to the presence of a thin electrolyte layer upon the alloy, restricting the repassivation of the corrosion pits.
