Article
Engineering, Mechanical
Shi Hui Lang, Hua Zhu, Chun Ling Wei
Summary: Friction signals are analyzed under different working conditions through phase trajectories and recurrence plots to identify wear states in the Friction System (FS). The phase trajectory moves within a limited space without exceeding the critical range, while the recurrence plots represent different wear states. Chaotic parameters, such as correlation dimension D, recurrence degree RR, and the proposed saturation radius rs, are used to study the boundedness, stability, and dynamics. The evolution of rs shows a pattern of decrease-stability-increase, while D and RR exhibit the opposite trend. Therefore, using chaotic representation methods to describe complex friction behavior and exploring boundedness, stability, and dynamic characteristics is significant for state identification, wear prediction, and quantitative design control.
TRIBOLOGY INTERNATIONAL
(2023)
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
Computer Science, Artificial Intelligence
Anam Azam, Muhammad Aqeel, Zakir Hussain
Summary: This article provides a detailed analysis and numerical investigation of KR flow derived from MHD equations, focusing on complex behaviors and symmetry. The study shows the profound impact of symmetry on chaotic dynamical systems and examines the relation between the KR chaotic attractor with symmetry and its projected image without symmetry. Additionally, the study evaluates the chaotic behavior of KR flow through Lyapunov spectrum and boundedness, along with the critical role of energy in generating KR flow wings.
Article
Meteorology & Atmospheric Sciences
Zhenru Shu, Pak Wai Chan, Qiusheng Li, Yuncheng He, Bowen Yan
Summary: The study demonstrates the complexity and variability associated with Hong Kong's rainfall data, with the existence of chaos recognized across various stations. Furthermore, the relationship between rainfall dynamics and temporal scales was examined, revealing that rainfall dynamics at finer resolution are less complex and have less pronounced variability compared to those at coarser resolution.
INTERNATIONAL JOURNAL OF CLIMATOLOGY
(2021)
Article
Engineering, Mechanical
Minglong Peng, Yuankai Zhou, Xue Zuo
Summary: This paper studies the dynamic features of friction coefficient during running-in state using recurrence analysis to recognize the running-in state of crankshaft journal bearings. The results show different patterns in recurrence plots during the running-in process and the evolution of phase trajectory in unthreshold recurrence plots, with three independent measures used to characterize the friction coefficient.
INDUSTRIAL LUBRICATION AND TRIBOLOGY
(2021)
Article
Meteorology & Atmospheric Sciences
Bowen Yan, Pak Wai Chan, Qiusheng Li, Yuncheng He, Zhenru Shu
Summary: The chaotic nature of many meteorological systems limits its predictability, and accurate prediction of meteorological variables relies on diagnosing the complex underlying dynamics properly. The study shows that wind speed exhibits a higher level of complexity in its underlying dynamics compared to pressure and temperature, leading to more irregular time-dependent behavior and lower predictability. Additionally, seasonal variability in the dynamics of meteorological time series is evident, especially for wind speed and temperature.
INTERNATIONAL JOURNAL OF CLIMATOLOGY
(2021)
Article
Engineering, Mechanical
Shihui Lang, Hua Zhu, Shaoze You
Summary: The study introduces vector characterization parameters based on phase space reconstruction and principal component analysis methods to identify state changes and characteristics during the running-in process, showing important application value and theoretical significance.
TRIBOLOGY INTERNATIONAL
(2021)
Article
Chemistry, Physical
S. Sankararaman
Summary: The paper introduces the use of recurrence plot and recurrence network as a new tool in data analytics to understand molecular dynamics in transient heat flow. By analyzing the thermal lens signal, the study investigates the thermal dynamics of ethylene glycol and identifies changes related to system orderliness and chaos. The application of these techniques holds potential significance in thermal system design and monitoring.
JOURNAL OF MOLECULAR LIQUIDS
(2022)
Article
Engineering, Biomedical
Nan Li, Jiarui Yu, Xiaobo Mao, Yuping Zhao, Luqi Huang
Summary: This study used nonlinear methods to investigate the activity state and dynamics characteristic changes of pulse in different trimesters of healthy pregnant women. The results showed significant differences in pulse characteristics among the three trimesters, with the second trimester showing the most significant changes. Nonlinear methods can be used to qualitatively and quantitatively describe the changes in pulse during pregnancy, revealing important characteristics of biological signals.
BIOMEDICAL SIGNAL PROCESSING AND CONTROL
(2023)
Article
Chemistry, Multidisciplinary
Atif Rizwan, Naeem Iqbal, Rashid Ahmad, Do-Hyeun Kim
Summary: In this research study, a novel weighted radius SVM (WR-SVM) is proposed to determine the tighter bounds of MEB. The experimental results reveal that the proposed WR-SVM significantly performed well compared to the conventional SVM classifier.
APPLIED SCIENCES-BASEL
(2021)
Article
Mathematics, Applied
Miaoqing Tian, Xiao He, Sining Zheng
Summary: This paper studies the chemotaxis system of two-species with two chemicals and logistic sources. It shows that for the attraction-repulsion case, the global boundedness of solutions can be ensured with mu(1), mu(2) > 0. While for the attraction-attraction case, the global boundedness of solutions requires small sensitivity coefficients chi(1), chi(2) or large logistic coefficients mu(1), mu(2).
JOURNAL OF MATHEMATICAL ANALYSIS AND APPLICATIONS
(2022)
Article
Geochemistry & Geophysics
Sabrine Benmebarek, Mohamed Chettih
Summary: The main goal of this study is to analyze the runoff series using a topological approach and determine if chaos exists. Traditional dynamic and metric approaches were tested initially, and the results indicate the presence of chaos. The application of the topological approach using recurrence plot and recurrence quantification analysis further strengthens the hypothesis of deterministic chaos in the runoff series.
Article
Engineering, Aerospace
Z. R. Shu, P. W. Chan, Q. S. Li, Y. C. He
Summary: This study extends the concept of nonlinear dynamic analysis to identify and characterize the dynamic structures hidden in wind speed fluctuation, demonstrating that wind speed time series may exhibit chaotic behavior. Different types of wind events (monsoons, tropical cyclones, thunderstorms) have distinct dynamic characteristics, and site-to-site variability in wind speed dynamics is evident.
JOURNAL OF AEROSPACE ENGINEERING
(2021)
Article
Chemistry, Multidisciplinary
Piotr Aschenbrenner, Wlodzimierz Erdmann, Bartosz Krawczynski, Marcin Krawczynski
Summary: The objective difficulty coefficient of alpine skiing competition courses was determined based on course geometry and kinematic parameters of the run by monitoring skiers during the FIS World Cup. The downhill style runs had the highest difficulty coefficient of 1.20, while the super giant and giant slalom had comparable values of 1.13-1.14, and the slalom had the lowest coefficient at 0.97. These coefficients can be used to estimate the degree of risk associated with different sections of a course.
APPLIED SCIENCES-BASEL
(2023)
Article
Engineering, Chemical
Osamh S. Alshahed, Baldeep Kaur, Michael S. A. Bradley, David Armour-Chelu
Summary: Chaotic invariant and recurrence quantification analysis measures were used to characterize the fully developed gas-solid flow in horizontal pneumatic conveying of plastic pellets. These measures describe the complexity in phase spaces (attractors) and recurrence plots, reconstructed from pressure and bottom arc-shaped electrostatic signals to characterize the behavior of flow patterns. Different flow patterns were identified and classified using high-speed video imaging and a flow pattern map and state diagram. Recurrence plots analysis showed different qualitative structures for the identified flow patterns. The correlation between the chaotic invariant and recurrence quantification analysis measures and the state diagram suggests that the fluctuations in pressure and electrostatic sensor signals can classify the flow patterns at different operating conditions. Combining the analysis measures for electrostatic signals can indicate the flow condition in relation to the minimum energy consumption operating conditions.
Article
Engineering, Mechanical
Yu Jiang, Hua Zhu, Z. Li, Z. Peng
NONLINEAR DYNAMICS
(2016)
Article
Engineering, Mechanical
Zhixiong Li, Yu Jiang, Xuping Wang, Z. Peng
NONLINEAR DYNAMICS
(2016)
Article
Mathematics, Interdisciplinary Applications
Yu Jiang, Hua Zhu, Z. Li
CHAOS SOLITONS & FRACTALS
(2016)
Review
Engineering, Multidisciplinary
Zhixiong Li, Yu Jiang, Chao Hu, Z. Peng
Article
Engineering, Multidisciplinary
Yu Jiang, Zhixiong Li, Chao Zhang, Chao Hu, Z. Peng
MEASUREMENT SCIENCE AND TECHNOLOGY
(2016)
Review
Chemistry, Multidisciplinary
Yu Jiang, Xiaogang Zhang, Chao Zhang, Zhixiong Li, Chenxing Sheng
JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
(2017)
Article
Engineering, Multidisciplinary
Zhixiong Li, Yu Jiang, Zhihe Duan, Zhongxiao Peng
STRUCTURAL HEALTH MONITORING-AN INTERNATIONAL JOURNAL
(2018)
Review
Thermodynamics
Yu Jiang, Zhixiong Li, Guang Yang, Yuelei Zhang, Xiaogang Zhang
ADVANCES IN MECHANICAL ENGINEERING
(2017)
Article
Engineering, Mechanical
Cong Ding, Hua Zhu, Guodong Sun, Yu Jiang, Chunling Wei
JOURNAL OF TRIBOLOGY-TRANSACTIONS OF THE ASME
(2018)
Article
Green & Sustainable Science & Technology
Zhixiong Li, Yu Jiang, Qiang Guo, Chao Hu, Zhongxiao Peng
Article
Instruments & Instrumentation
Yu Jiang, Chih-Hsiung Lee, Jingping Wu
Article
Engineering, Mechanical
Cong Ding, Hua Zhu, Yu Jiang, Guodong Sun, Chunling Wei
JOURNAL OF TRIBOLOGY-TRANSACTIONS OF THE ASME
(2019)
Article
Computer Science, Software Engineering
Yu Jiang, Hua Zhu, Reza Malekian, Cong Ding
CONCURRENCY AND COMPUTATION-PRACTICE & EXPERIENCE
(2019)
Article
Computer Science, Artificial Intelligence
Yu Jiang, Hua Zhu, Cong Ding, Olivia Pfeiffer
JOURNAL OF INTELLIGENT & FUZZY SYSTEMS
(2019)
