bluuebunny/crossref_metadata_2025_split huggingface dataset:
Chaotic behavior and multistability of a tree trunk structure driven by self-and parametric hydrodynamic forces
Authors: Adéchinan A J , Kpomahou Y J F , Adéyémi C 
Published: October 2024

Abstract
This study investigates the chaotic behavior of a tree trunk under dynamic wind loads, focusing on control strategies and multistability. We consider time-varying wind speeds and analyze a specific case where hydrodynamic drag forces align with the flow velocity. The stability of the model’s equilibrium points is analyzed theoretically and numerically. Melnikov’s method is employed to identify conditions for homoclinic bifurcation. Numerical simulations employing basin of attraction confirm the analytical predictions. Our findings show a decrease in the threshold for chaos with increasing amplitudes of external excitation, damping coefficient, and parametric damping. The global dynamics are explored numerically using a fourth-order Runge-Kutta method. When solely subjected to external excitation, the system exhibits period doubling bifurcations, multiperiodic oscillations, mixed-mode oscillations, and chaos. Conversely, with self- and parametric drag forces, the system displays reverse periodic bifurcations, periodic bubbling oscillations, antimonotonicity, transient chaos, and chaos. Poincaré maps analyze the geometric structure of chaotic attractors, revealing a strong influence of dimensionless drag parameters. These parameters can be manipulated to control or eliminate chaos. Furthermore, the system exhibits multistability, with coexisting attractors. Beyond its application in protecting infrastructure from wind damage, this research can contribute to ecological balance by improving our understanding of tree wind resistance.
Longitudinal one-dimensional mechanical topological insulator
Authors: Carhart Madeleine Hoag , Fairfield Parker , Merlo Juan M , Thatcher Luke , Merlo-Ramírez Lázaro 
Published: October 2024

Abstract
We present a study of a longitudinal one-dimensional mechanical topological insulator based on a slinky spring in the Su-Schrieffer-Heeger (SSH) configuration. The system demonstrates key characteristics of topological insulators, including the existence of edge states in the bandgap, exponential decay of amplitude, and a winding number of 1 for topological phases. By manipulating the stiffness of the spring through the placement of masses, we transition between trivial, metallic, and topological phases. Our findings also show that the edge states are robust against perturbations, and we observe a critical phase transition where the coherence length follows a critical exponent of -1, as predicted by theory. This simple mechanical system provides an accessible platform for studying the special properties of topological insulators and opens up new possibilities for exploring topological phenomena in classical systems.
Crack inhibition to enhance the tensile and impact strength of additively manufactured CuCrZr alloy
Authors: Saravana Kumar M , Jeyaprakash N , Yang Che-Hua 
Published: October 2024

Abstract
This research focuses on enhancing the tensile and impact strength (IS) of the LPBF-based CuCrZr alloy parts based on crack inhibition. Also, it focuses on reducing the gas entrapment percentage while printing the parts which was the primary cause for crack nucleation. Three influential LPBF constraints, such as Print Orientation (PO), Layer Thickness (LT), and Hatching Range (HR), were examined to eliminate the gas entrapment, which was the primary reason affecting the structural integrity of the printed parts. Entropy - Deng’s similarity approach was embraced to find satisfactory conditions for printing the copper alloy parts. The overlapped, un-overlapped, and fused particle nano hardness analyses were examined. The results show that the overlapping zone had 17.5% greater nano-hardness than the fused particles. Moreover, the UTS of 376.57 MPa and IS of 14.85 J with a reduced gas entrapment percentage of 0.17% was witnessed during the implementation of 90° print orientation with reduced layer thickness and hatching range of 25 μm and 0.03 mm.
A generalized method of constraining Warm Inflation with CMB data
Authors: Kumar Umang , Das Suratna 
Published: October 2024

Abstract
A thorough MCMC analysis of any inflationary model against the current cosmological data is essential for assessing the validity of such a model as a viable inflationary model. Warm Inflation, producing both thermal and quantum fluctuations, yield a complex form of scalar power spectrum, which, in general, cannot be directly written as a function of the comoving wavenumber k, an essential step to incorporate the primordial spectra into CAMB to do an MCMC analysis through CosmoMC/Cobaya. In this paper, we devised an efficient generalized methodology to mould the WI power spectra as a function of k, without the need of slow-roll approximation of the inflationary dynamics. The methodology is directly applicable to any Warm Inflation model, including the ones with complex forms of the dissipative coefficient and the inflaton potential.
Preface
Authors: Lorenz Pascal 
Published: October 2024

Abstract
During June 21-22, 2024, the 2nd International Conference on Computer Technology and Information Science (CTIS2024) was successfully held online. This conference included keynote speeches, invited speeches, oral and poster presentations.
Prof. Yong Yue from Xi’an Jiaotong-Liverpool University (XJTLU), China; Assoc. Prof. Lei Chen from Shandong University, China and Dr. Binqiang Wang from Inspur (Beijing) Electronic Information Industry Co. Ltd attended the conference and delivered keynote speeches. In addition, experts and scholars from the Guizhou Normal University, Guiyang, China; Harbin Institute of Technology; IEIT SYSTEMS Co., Ltd.; Kansai University, Osaka, Japan and other universities and institutes shared wonderful speeches.
This conference proceedings included 7 accepted articles selected from 39 submissions, all the papers have been through rigorous review and process to meet the requirements of international publication standard. We would like to express our gratitude to the reviewers of these manuscripts, who provided constructive criticism and stimulated comments and suggestions to the authors. We are extremely grateful as organizers, technical program committee and editors and extend our most sincere thanks to all the authors for their excellent contribution and work. Our sincere gratitude also goes to the IOP Publishing editors and managers for their helpful cooperation during the preparation of the proceedings.
On behalf of the Organizing Committee of CTIS2024.
List of Technical Program Committee is available in this Pdf.
Optimizing resource utilization in cloud and fog computing environments using Hidden Markov Model
Authors: Hussein Awlla Ardalan , Barzan Abdalla Hemn 
Published: October 2024

Abstract
The massive volumes of data IoT devices generate are processed on the cloud. Fog computing, a hybrid cloud, and IoT solution, is used to distribute workloads and allocate resources efficiently, but it requires much research to implement. The study investigates load balancing in fog and cloud computing environments, which is crucial for managing IoT data. Cloud computing centralizes data processing and storage in remote storage facilities, whereas fog computing decentralizes functions to intermediary nodes closer to data generation and consumption. This close proximity facilitates optimal bandwidth usage, decrease delay, and faster computing. This study uses Hidden Markov Model (HMM) to examine task behaviour’s across diverse computing nodes and consider resource requirements. This study captures the probabilistic nature of load distribution by constructing emission and transition matrices from observed task dynamics and node-specific information. This research demonstrates the effectiveness of HMM in describing and optimizing load-balancing tactics, HMM play a vital role in optimizing load balancing tactics, as they model resource utilization, providing insights into enhancing resource allocation efficiency within complex computing infrastructures. The accuracy of the proposed method is approximately 92%.
Better approximation of sigmoid function for privacy-preserving neural networks
Authors: Zhao Yunran , Li Xuelei 
Published: October 2024

Abstract
With the development of artificial intelligence technology, privacy protection has become a prominent research direction. Homomorphic encryption is an important and promising technology in the construction of privacy-preserving neural networks. However, computing nonlinear activation functions remains a challenging task in the context of homomorphic encryption. Considering Sigmoid is one of the most commonly used activation functions, this paper proposes a polynomial approximation method for the Sigmoid function and applies it to the homomorphic encryption scheme of CKKS. We design polynomial approximation functions using Improved Taylor Expansion Segmentation (ITES), Least Squares method (LS), and Random Noise Addition method, respectively. These methods are implemented through the CKKS scheme in the homomorphic encryption library of SEAL. The experimental results show that the ITES achieves high fitting accuracy, reducing the average absolute error by 11.09% and the mean squared error by 38.06% compared to previous fitting methods. Therefore, experiments have identified methods with better fitting results in the CKKS scheme, which can meet the requirements of using homomorphic encryption in deep learning technologies. Finally, our analysis points out that different technologies have unique advantages and adapt to different scenarios, e.g., ITES has higher accuracy, LS has higher performance in scenarios with limited computing resources.
Application on ac station service system for gathering station based on roof photovoltaic system
Authors: Du Shaofei , Xiong Zaibao , Su Guang , Jing Tian , Zhang Yingying , Zhang Tong 
Published: October 2024

Abstract
With the increasingly severe global energy crisis and environmental pollution, it is imperative to develop and utilize clean and renewable energy. In order to achieve carbon peak and carbon neutrality as soon as possible, and reduce the proportion of fossil energy generation, decarbonization in the power industry is imperative. This article focuses on the design of rooftop photovoltaic systems at gathering stations. By installing solar photovoltaic panels on the roof of the gathering station building, a photovoltaic power generation system is constructed to convert solar energy radiated into electricity. The DC power generated by the solar photovoltaic power generation system is converted by an inverter and connected to the 380V bus of the station power system as a supplementary power supply for the station load, thereby increasing the proportion of green electricity consumption in the collection station and achieving the goal of carbon reduction
Research on the application of distributed smart grid protection technology scheme
Authors: Xiong Zaibao , Zhao Weibo , Zhang Yong , Gao Yu , Jiang Taoning , Xiao Bing 
Published: October 2024

Abstract
Distributed smart grid is an organic carrier for achieving renewable energy substitution and promoting new energy consumption. It is an important component of the construction of new power systems. To meet the current operational needs of distributed smart grid construction, a distributed smart grid protection method based on AC/DC hybrid distribution network is proposed. The distributed smart grid protection and application method proposed in this article, has good promotion and application value.
The experimental research of which different types of impact signals affect the bifurcation chaos behavior of three-degree-of-freedom collision system
Authors: Wang Qiang , Zhang Xin , Xing Zhikai , Li Mo , Liu Yongbao 
Published: October 2024

Abstract
Collision is a faulty behavior in mechanical equipment, which greatly affects the safety of equipment. In this paper, aiming at the collision failures that are prone to occur in mechanical equipment, the nonlinear fault collision behavior of a class of three-degree-of-freedom collision systems is studied. A three-degree-of-freedom piecewise non-smooth collision experiment platform system has been established to facilitate further analysis of the bifurcations and chaos inherent to the bearings system. This analysis is conducted through the use of Poincaré mapping on the collision plane. The excitation signals employed, which include sinusoidal, triangular, and rectangular signals, result in the emergence of specific types and orders of bifurcation behaviours within the system, as evidenced by the establishment of a Poincaré mapping at the collision surface, and this is observed to occur as the vibration frequency increases. The characteristics of impact signals generated by force sensors and the influence of impact signal type on the system are investigated. The nonlinear impact behavior of three-degree-of-freedom collision systems provides a reliable foundation for the design, fault diagnosis, and theoretical guidance of large-scale high-speed rotating machinery, as well as technical support for safe and stable operation of high-speed rotating machinery, which is essential for failure analysis and vibration reduction in equipment.
Research on magnetic fluid precise localized lubrication thrust cylindrical roller bearing with low-friction micro-vibration and high load-bearing capacity
Authors: Rui Hu , Hansheng Chen , Haoran Zhang , Humao Wei , Junpeng Gui , Songshan Yan , Hougen Luo , Yi Guo , Chunxia Xu , Jianwu Yan , Lei Zhang , Guoliang Liu 
Published: October 2024

Abstract
As the magnetic field that is difficult to be distributed in the existing magnetic fluid thrust cylindrical roller bearing structure, it is more difficult for the magnetic fluid to be evenly distributed inside the bearing raceway with the axial localized lubrication, which seriously affects the engineering application of the magnetic fluid bearing. To solve the magnetic field control problem that the magnetic fluid is uneasy to be accurately localized and adsorbed, a new type of magnetic fluid thrust cylindrical roller bearing is designed in this study, which shows good characteristics of low-friction, micro-vibration and high load-bearing capacity. The seat-ring is set as an annular raceway that can be used for magnetic fluid storage and matching with the roller lubrication system, and an annular permanent magnet is designed as an external magnetic field source to be placed below the annular raceway to adsorb the magnetic fluid on the friction surface. The structure design of the axial magnetic fluid localized lubrication bearing is reasonable, which is especially suitable for precision instruments with strict operating-conditions and precision-lubrication.
Theoretical analysis for dynamic model of U-shaped electrothermal microactuator based on Chebyshev spectral method
Authors: Tang Yujuan , Chen Hao , Wang Xinjie 
Published: October 2024

Abstract
This paper presents a largely and accurate analysis for dynamic model of U-shaped actuator that considers the material parameters dependent on temperature. The electro-thermal analysis for temperature distribution and thermo-mechanical analysis for deflection is carried out. The electro-thermal dynamic behaviour is described by piecewise one-dimensional (1D) heat transfer partial differential equations (PDE) for each beam of U-shaped actuator. A combination of Chebyshev spectral method for space domain and Euler forward difference method for time domain is used to solve these equations. The convergence test is first done to ensure the result convinced.
Design and research of serial communication system based on virtual instrument technology
Authors: Zhang Qingqing 
Published: October 2024

Abstract
In the measurement and automation control system, serial communication has been connected between the acquisition hardware (lower computer) and the upper computer between the easiest to realize and the most economical way. In view of the traditional instrument itself is relatively bulky, inconvenient to carry, this paper adopts the virtual instrument development environment to realize the realization of serial communication, in order to complete the subsequent data acquisition. When compared with other software development environment, LabWindows/CVI platform comes with a function library to make the program writing simple and flexible. In this paper, we designed the realization method of serial communication based on virtual instrument Labwindows/CVI environment, completed the design and realization of serial communication between PC and lower computer (microcontroller) based on Labwindows/CVI environment, and applied it to the example of serial communication with microcontroller to realize the data communication function. Practical results prove that the serial communication system based on virtual instrument technology has the advantages of friendly user interface, high stability, convenience and reliability, and can reliably and accurately complete the communication, and provide strong technical support for the system to follow up data acquisition.
A radar array expansion design method based on modular subarray layout
Authors: Yang Chunpeng , Dai Ye , Zhou Hanxuan , Zhou Bufeng 
Published: October 2024

Abstract
This paper introduces a design method for expandable subarray structures used in phased array radar arrays. Based on the structural characteristics of modular subarray layout for large radar arrays, this paper analyzes the assembly dimension chain tolerance based on subarray expansion. One third of the allowable deviation of the radar array is used as the subarray design tolerance, and the size tolerance of each installation surface of the subarray is designed according to the design tolerance. Finally, the subarray array is assembled into any size of radar array, and the probability of the radar array assembly accuracy meeting the allowable deviation is 99.73%. For large radar arrays, adopting this design method can significantly reduce the tolerance span between the sub array and the area array, greatly reducing the difficulty of design and processing. This paper provides a fundamental design method for the expansion design of radar arrays with similar systems, which has universal applicability.
Modelling and control of the lower hook mechanism for fishing net weaving machine based on active disturbance rejection controller
Authors: Ming Cankun , Sun Zhijun , Hao Zhichang , Sun Yize 
Published: October 2024

Abstract
The lower hook mechanism of the fishing net weaving machine has significant impact on its weaving velocity and net quality. This study incorporated a multi-motor based lower hook mechanism, which is driven by multi-motors instead of mechanical cams. Compared with the traditional lower hook mechanism, the multi-motor based lower hook mechanism has the advantages of fewer mechanical wear and faster running speed. However, the working condition of the lower hook mechanism places a very high demand on its following accuracy and resistance to disturbance, so the servo motor should be highly accurate and highly robust. The commonly used controller of the servo motor is three closed loop proportion-integral (PI) controller. In this paper, we modelled and experimentally verified the multi-motor based lower hook mechanism, and rebuilt the servo motor controller by replacing the position loop PI and speed loop PI of the three closed loop PI controller with position-velocity joint active disturbance rejection controller. Simulations suggest that the active disturbance rejection controller performs better on both following accuracy and resistance to disturbance compared with the traditional PI controller in the application of lower hook mechanism.
Hybrid multiscale computational approach for heat transfer in GaN semiconductors
Authors: Rao Xixin , Yan Yuancheng , Xiao Chengdi , Tian Qing 
Published: October 2024

Abstract
With ongoing advancements in semiconductor technology, understanding thermal transport in semiconductor devices—where phonons are the primary charge carriers—is crucial. This involves a multiscale process in which phenomena at different scales are governed by distinct control equations, necessitating various numerical methods. In this context, this paper introduces a novel multiscale simulation method called the Second-Order Reconstruction Operator Finite Difference Lattice Boltzmann Method (ROsFDLBM). This method effectively combines the Lattice Boltzmann Method (LBM) with the Finite Difference Method (FDM). ROsFDLBM employs reconstruction operators to accurately map the relationship between distribution functions and macroscopic physical quantities, significantly reducing errors caused by the transmission of interface information. The efficacy of this coupling scheme has been confirmed through an interface-coupled thermal diffusion model. Comparative analyses have revealed that the relative error of ROsFDLBM does not exceed 1.2%, demonstrating its superior accuracy. Further simulations of GaN devices have confirmed that traditional macroscopic methods tend to underestimate the temperature in the heat source area at micro-nano scales, with discrepancies reaching up to 60.9 K. Overall, the ROsFDLBM aligns with current research findings and offers an accurate and efficient simulation strategy for addressing complex heat transfer problems.
Design and analysis of large displacement bidirectional device based on multi-electrothermal co-actuation
Authors: Ding Yujiao , Wang Xinjie , Wang Xujian 
Published: October 2024

Abstract
As an important part of the MEMS safety system of fuze, the micro-actuator is responsible for the important functions of energy conversion, motion, force transmission and response to system information, etc. However, due to the size limitation of MEMS and the characteristics of electrothermal actuator itself, it is difficult for a single electrothermal actuator to drive the flameproof slider to achieve the target displacement. This paper aims to study and analyze the performance of the large displacement bidirection device based on multi-electrothermal co-actuation. After finite element analysis, the results show that the large displacement bidirection device can drives the flameproof slider to achieve the displacement up to 162.6μm within one cycle time, which is about 1.4 times displacement of the single V-shaped actuator outputs at 1.5V voltage. The error of response time between the theoretical calculation and the simulation analysis is less than 5.88%. The correctness of simulation and the feasibility of the large displacement bidirection device based on multi-electrothermal co-actuation is verified.
Dynamic modelling and a model-based control strategy of joint servo system for power transmission line inspection robot
Authors: Fan Xing , Li Xiaopeng , Shi Bing , Yang Hexu , Liu Wenwen , Ye Cunliang 
Published: October 2024

Abstract
The time-varying load inertia is one of the important dynamic characteristics of the power transmission line inspection robots (PTLIRs) in joint space, which can heavily affect the stability of the robot in the inspection process. In this paper, with considering the time-varying characteristics of load inertia, a method for modelling and control of the flexible joint servo system of the PTLIR is studied. First, the control system of the PTLIR is established based on the two inertia system. In order to calculate the load inertia, a dynamic model of the inspection robot is established. Then, the model-based notch filter is designed to improve dynamic performance of the robot, and suppress the vibration amplitude change which caused by the time-varying load inertia. Finally, the comparison of the control performance between the traditional control strategy and the model-based control strategy with notch filter are compared. The simulation results show that the paper can provide an effective tool for modelling and improving the stability of the PTLIR.