Article
Automation & Control Systems
Yue Wu, Huan Yuan, Renjie Zhang, Aijun Yang, Xiaohua Wang, Mingzhe Rong
Summary: This article introduces a new electromechanical wireless power transfer method that enables wireless charging at different tilt angles through a low-frequency rotating magnetic field and a permanent magnet rotor. The feasibility and stability of the proposed system are demonstrated through theoretical analyses and experimental results, making it suitable for free-positioned and free-oriented sensors or low-power devices in enclosed or semienclosed areas.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2022)
Article
Thermodynamics
M. U. Hafeez, T. Hayat, A. Alsaedi, Muhammad Imran Khan
Summary: This study focuses on the magnetohydrodynamic (MHD) rotating flow of ethylene glycol based hybrid nanofluid between two permeable boundaries. Through graphical analysis of velocity components and temperature, important observations regarding skin friction coefficient and Nusselt number are obtained.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
Article
Nanoscience & Nanotechnology
Xueyuan Bai, Hao Tong, Chenzi Wang, Yong Li, Qifeng Tan, Zixing Ye, Lujun Pan, Yongpeng Zhao
Summary: This study proposes the fabrication of micro/nanorobots made of helical carbon nanowires using a low-cost batch fabrication technique controlled by a magnetic field. The research investigates the motion of these helical carbon nanowire robots (HCNRs) immersed in a low-Reynolds-number liquid. The results show that HCNRs have good mobility and can be used for capturing and transporting small particles, presenting a new method for nanoparticle transport using helical micro/nanorobots.
ACS APPLIED NANO MATERIALS
(2022)
Article
Mechanics
N. Paldor, L. Friedland
Summary: By substituting angular momentum for zonal velocity, we analyze the dynamics of a water column at the ocean surface forced by zonal wind stress on the rotating spherical Earth. This results in a model of the column's trajectory as a quasiparticle in a time-dependent potential well. We derive explicit solutions for the temporal changes in angular momentum and the associated minima and oscillations of the potential well, which are confirmed by numerical solutions of the nonlinear differential equations.
Article
Astronomy & Astrophysics
J. Matsumoto, Y. Asahina, T. Takiwaki, K. Kotake, H. R. Takahashi
Summary: The impact of magnetic field on post-bounce supernova dynamics of non-rotating stellar cores is investigated through 3D magnetohydrodynamics simulations. It is found that the amplified magnetic field in strongly magnetized models leads to a faster and more energetic explosion. Additionally, higher order spatial accuracy enhances neutrino-driven convection and benefits the explosion. A new possibility for the origin of the magnetic field of the protoneutron star is proposed.
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
(2022)
Article
Chemistry, Multidisciplinary
Tianyu Zhong, Jialin Meng, Mark P. Andrews
Summary: Researchers have successfully obtained permanent encodings of the complex field response of magnetite nanoparticles in alkane media using evaporation-induced self-assembly. They examined several variables that control the pattern formation and found that the magnetic field gradient, solvent evaporation rate, and solvent chain length nonlinearly affect the pattern measurables. The nanoparticle concentration, however, has only a minor impact on the measurables.
Article
Astronomy & Astrophysics
Matteo Buzzegoli, Jonathan D. Kroth, Kirill Tuchin, Nandagopal Vijayakumar
Summary: In this study, we investigated the synchrotron radiation emitted by a charged fermion in a constant magnetic field parallel to the axis of rotation. The rotation is classical and independent of the magnetic field. We derived the intensity, spectrum, and chirality of the electromagnetic radiation using the exact solution of the Dirac equation. Our numerical calculations demonstrate that the effect of rotation on the radiation intensity increases with the particle energy and can either strongly enhance or suppress the radiation, depending on the relative orientation of the vectors omega and B and the sign of the electric charge.
Article
Physics, Multidisciplinary
Iwo Bialynicki-Birula, Zofia Bialynicka-Birula
Summary: We obtain new solutions for the Schrodinger, Klein-Gordon, and Dirac equations, which describe the motion of particles in a uniform magnetic field. These solutions exhibit quantum particle behavior that closely resembles classical helical trajectories, in contrast to the well-known stationary solutions. Furthermore, these solutions serve as an illustration of the meaning of the Ehrenfest theorem in relativistic quantum mechanics.
JOURNAL OF PHYSICS A-MATHEMATICAL AND THEORETICAL
(2023)
Article
Chemistry, Multidisciplinary
Jiaxin Hou, Anirban Mondal, Guiying Long, Laurens de Haan, Wei Zhao, Guofu Zhou, Danqing Liu, Dirk J. Broer, Jiawen Chen, Ben L. Feringa
Summary: Innovatively designed liquid crystal network (LCN) materials utilize intrinsic rotary motors to convert light energy into reversible helical motion, achieving the translation of molecular movement into controlled linear, twisting, and rotating motions. By utilizing a photochemical-driven molecular motor as a chiral dopant and unidirectional rotor, this responsive system amplifies molecular motion into reversible left- or right-handed macroscopic twisting movement, showcasing fascinating opportunities for inherently photo-responsive materials.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2021)
Article
Engineering, Manufacturing
Deku Zhang, Hongyu Yin, Wei Bai, Kehong Wang
Summary: In this study, a method of arc hollow stud welding driven by external rotating magnetic field was proposed to address the issue of local non-fusion in medium and large diameter hollow stud welding. The rotating magnetic field was found to promote uniform burning of the arc and expansion of the molten pool, avoiding local unfused phenomenon and improving joint appearance. The rotating arc also stirred the molten pool, reducing undercooling and refining the grain size of the weld. The resulting magnetron stud welded joint exhibited high shear strength, impact toughness, and microhardness.
JOURNAL OF MANUFACTURING PROCESSES
(2022)
Article
Physics, Fluids & Plasmas
Baoming Ren, Jiadong Zhang, Zhida Yang, Guanghui Zhu, Haiyang Zhou, Jian Zheng, Xuan Sun
Summary: A novel method using rotating magnetic field to control plasma rotation speed was reported in this study, where electron-ion collisions are found to drive rotation. The experiment showed that plasma rotation speed is primarily determined by the RMF strength, with the rotation starting from the outside and developing sheared flow in the core region.
PLASMA PHYSICS AND CONTROLLED FUSION
(2021)
Article
Multidisciplinary Sciences
Bo Liu, Chaozhan Chen, Bin Ran, Liuyong Shi, Jiashen Wei, Jing Jin, Yonggang Zhu
Summary: This paper presents a high-performance 3D micromixer with helical elements, which is able to achieve efficient mixing over wide Reynolds numbers. A coupled numerical model is utilized to analyze the flow pattern, mixing behavior, residence time distribution, and mixing performance of the micromixer. The optimized micromixer shows excellent mixing ability over a wide range of Reynolds numbers, with an efficiency of over 94%.
ADVANCED THEORY AND SIMULATIONS
(2023)
Article
Automation & Control Systems
Dmitry Egorov, Ilya Petrov, Juha J. Pyrhonen, Joosep Link, Raivo Stern, Peter Sergeant, Bulent Sarlioglu
Summary: This study assesses the hysteresis behavior of two NdFeB PM grades with different magnetic properties in a PMSM. The results indicate that hysteresis loss resulting from structural imperfections and magnet geometry may introduce considerable loss in NdFeB PMs applied in rotating electrical machines.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2022)
Article
Materials Science, Multidisciplinary
Fengying Qin, Juanyan Wu, Dongmei Fu, Ye Feng, Chao Gao, Dazhi Xie, Shaoming Fu, Suyi Liu, Daniela A. Wilson, Fei Peng
Summary: The study proposes a DNA detection system based on a magnetic helical hydrogel micromotor, which can detect tumor DNA in a non-invasive, quick, and simple manner, exhibiting excellent moving performance and high efficiency response.
APPLIED MATERIALS TODAY
(2022)
Article
Energy & Fuels
Amarkumar Kushwaha, Naveen Endla, B. G. Fernandes
Summary: This article discusses the operational aspects of a 12-slot/10-pole, coupled motor integrated electrodynamic wheel (MIEDW) and analyzes the unbalanced flux-linkages caused by the asymmetric motor airgap field distribution. The article also presents a practical realization of the MIEDW using a cage rotor structure with block-shaped magnets. Experimental verification is provided to validate the proposed topology and the finite element analysis simulation models.
IEEE TRANSACTIONS ON ENERGY CONVERSION
(2023)
Article
Crystallography
F. Baltaretu, M. A. Gonik
Summary: The crucibleless AHP method for growing single crystals of oxides is proposed and the conditions of experiment preparation and melt flow dynamics are investigated using analytical and numerical approaches. The results are important for achieving enlarged and constant diameter modes during crystal growth.
JOURNAL OF CRYSTAL GROWTH
(2022)
Article
Materials Science, Multidisciplinary
Long Cheng, Wenyu Hao, Runcong Liu, Xiaodong Wang, XiuFang Gong, Florin Baltaretu, Yves Fautrelle
Summary: The study introduces a modulated permanent helical magnetic field to improve segregation during directional solidification in a binary alloy, reducing solute segregation otherwise caused by conventional helical magnetic fields. Experimental results demonstrate that this magnetic field, with an appropriate modulation frequency, can not only promote columnar-to-equiaxed transition (CET) but also has advantages over natural convection and conventional electromagnetically forced convection.
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
(2022)
Article
Computer Science, Interdisciplinary Applications
Mengxia Ma, Jie Ouyang, Xiaodong Wang
Summary: This paper presents a new stabilized high-order discontinuous Galerkin method for simulating highly elastic fluid flows at high Weissenberg numbers. The method is able to accurately and stably simulate different viscoelastic flow problems, and it has high-order accuracy and robustness. Compared with existing schemes, this method is more flexible and easier to implement.
ENGINEERING WITH COMPUTERS
(2023)
Article
Environmental Sciences
Xiaokang Guo, Runcong Liu, Xiaodong Wang
Summary: During two-phase fluid displacement in a porous medium, self-regulation mechanisms result in a diverse range of fluid displacement patterns, such as the introduction of a highly tortuous displacement channel, the appearance of the retention and development regions of the displaced phase, and the expansion of the displacement path area of the invading phase. These findings provide physical explanations for the underlying mechanisms controlling fluid displacement pattern transitions and the influence of inertial effects on the displacement patterns.
WATER RESOURCES RESEARCH
(2023)
Article
Chemistry, Multidisciplinary
Pei He, Yangming Guo, Xiaodong Wang, Shiqi Zhang, Zhihao Zhong
Summary: With the increase in environmental pressure and rapid development of renewable energy technologies, an integrated energy system has been recognized as an effective approach to accommodate large-scale renewables and achieve environmental sustainability. In this paper, a multi-level fuzzy evaluation model based on combined empowerment was proposed for the reliability assessment of an integrated energy system. The effectiveness and advantages of the proposed model were demonstrated through case studies on a practical integrated energy system.
APPLIED SCIENCES-BASEL
(2023)
Article
Chemistry, Multidisciplinary
Xiaodong Wang, Yangming Guo, Nan Lu, Pei He
Summary: Currently, the use of unmanned aerial vehicles (UAVs) is increasing in various activities, including civilian and military applications. UAV clusters are complex real-time feedback systems that integrate communication and sensor networks, control systems, calculations, and physical processes. The comprehensive modeling of heterogeneous UAV clusters is important for testing and verifying new combat modes. In this paper, a novel representation framework based on Petri nets is proposed to capture the discrete and continuous processes of a heterogeneous UAV cluster system. Formal verification of UAV cluster attack mission modeling using UPPAAL demonstrates the feasibility and effectiveness of the proposed modeling method.
APPLIED SCIENCES-BASEL
(2023)
Article
Materials Science, Multidisciplinary
Zhenyuan Zhu, Fenfen Han, Yanyan Jia, Jiamin Wang, Xiaodong Wang, Bin Leng, Chengpeng Liu, Xiaoli Li, Xingtai Zhou
Summary: The influence of yttrium (Y) addition on the tellurium (Te) induced intergranular embrittlement of Ni-16Mo-7Cr alloy was investigated. The addition of Y remarkably reduces the diffusion depth of Te into the alloy, improving its intergranular cracking resistance. The presence of YTe phases on the surface reaction layer and near-surface grain boundaries plays a crucial role in fixing Te and slowing down its diffusion. However, excessive Y addition (>0.05 wt%) does not continuously improve the intergranular embrittlement resistance, and can even damage the mechanical properties.
Article
Materials Science, Multidisciplinary
Xiaodong Wang, Xinmei Yang, Miaomiao Hu, Huajian Liu, Xingtai Zhou
Summary: The effect of temperature on the interaction between SiC and GH3535 alloy in molten LiF-NaF-KF salt was studied. It was found that temperature played a critical role in the interaction. No interaction occurred at 500 and 600°C, while the interaction happened at 650°C and higher temperatures through reactions among SiC, alloy, and their corrosion products. The corrosion products of the alloy reacted with SiC to form Cr3C2, and the corrosion products of SiC reacted with Ni to form Ni31Si12 and Ni2Si on the alloy surface. The depth of corrosion and deposition increased with temperature.
Article
Engineering, Multidisciplinary
Liping Ma, Lijing Zhao, Xiaodong Wang
Summary: Based on our previous study, the combination of the semi-Lagrangian method and the element free Galerkin method has been proven to be effective in solving convection-dominated problems. The meshless feature simplifies the backtracking process in the semi-Lagrangian method. However, the moving least squares approximation in the element free Galerkin method is somewhat costly. To address this issue, this paper presents an iteration-free backtracking method based on Taylor expansion, which greatly improves computational efficiency without sacrificing accuracy when compared to other backtracking methods.
ENGINEERING ANALYSIS WITH BOUNDARY ELEMENTS
(2023)
Article
Mechanics
Zhijie Zhao, Runcong Liu, Xiaodong Wang
Summary: To identify Coulter signals with low SNR using chaotic oscillators, a Gaussian pulse signal is used to simulate the signals, and the continuous synchronous mutation phenomenon of a chaotic ring-coupled double-Duffing oscillator is studied for signal identification. The maximum difference between the oscillator's state variables can determine its anti-noise ability and be used to construct a function for identifying pulse amplitudes. A Simulink model confirms that this method can successfully identify pulse amplitudes with low SNR, providing an approach for measuring Coulter signals with low SNR.
JOURNAL OF THEORETICAL AND APPLIED MECHANICS
(2023)
Article
Engineering, Multidisciplinary
Zhijie Zhao, Ruyue Yang, Xiaodong Wang
Summary: A Coulter prototype experiment is conducted to identify low-SNR Coulter signals by combining coupled Lorenz-like oscillators. Numerical simulation is used to analyze the synchronization mutation phenomena in the chaotic oscillators with the addition of low-SNR Gaussian pulses. A nonlinear circuit is designed and fabricated to process low-SNR Coulter signals in the experiment, and the particle size distribution is obtained by selecting the maxima in the output signals according to the identification formula. The nonlinear circuit effectively reduces the lower limit of detection in Coulter signals.
MEASUREMENT SCIENCE AND TECHNOLOGY
(2023)
Article
Mechanics
Mengxia Ma, Jie Ouyang, Xiaodong Wang
Summary: The numerical investigation of the Oldroyd-B fluid flow around an oscillating circular cylinder provides a better understanding of the lock-in phenomenon and wake topology. The study utilizes the high-order dual splitting scheme with the square-root-conformation representation approach and implements the arbitrary Lagrangian-Eulerian formulation to handle complex boundary movements. The force coefficients and wake structures of vortex and stress are discussed in detail, revealing different wake modes for various frequencies at Re=60 and Wi=0.1.
Article
Thermodynamics
Qadeer Raza, Xiaodong Wang, M. Zubair Akbar Qureshi, Sayed M. Eldin, Abd Allah A. Mousa, Bagh Ali, Imran Siddique
Summary: A mathematical model is proposed to analyze the effect of interfacial nanolayers on heat and mass transfer processes in nanofluid flow. The presence of carbon nanotubes (CNT) in a biological fluid is investigated, and a phase simulation is developed based on Brownian and thermophoresis factors. Optimal nanoparticles in the range of 2-8% have a significant effect on thermal conductivity and the thermal performance of the blood flow system.
CASE STUDIES IN THERMAL ENGINEERING
(2023)
Article
Energy & Fuels
Stuart Bell, Madjid Sarvghad, Teng-Cheong Ong, Daniel Naylor, Xiaodong Wang, Yanting Yin, Raihan Rumman, Gunther Andersson, Geoffrey Will, David A. Lewis, Theodore Steinberg
Summary: Next generation concentrated solar thermal power can achieve receiver temperatures up to 800 degrees C. However, current solar salt based thermal storage is limited to 560 degrees C. Eutectic salt mixtures were investigated as potential latent heat energy storage media, and showed a smaller physical size of the storage system. The compatibility of a binary eutectic mixture of K2CO3 and Na2CO3 salt with three high temperature alloys was assessed, and the salt was found to be highly corrosive to the alloys.
SOLAR ENERGY MATERIALS AND SOLAR CELLS
(2023)
Article
Engineering, Electrical & Electronic
Wang Xuefeng, Yan Changxiang, Wang Xiaodong, Gu Zhiyuan
Summary: A continuous zoom optical system with a large field of view, high resolution, and high zoom ratio was designed for deep-sea exploration. By considering the image quality degradation caused by the deformation of the optical window under deep water pressure, an optomechanical analysis of the optical window was conducted and the results were optimized using Zernike polynomial. The zoom system adopts a mechanical negative group compensation zoom method and image square telecentric design scheme, achieving a full field of view of 5.7 degrees - 90 degrees and 10 times continuous zoom.
LASER & OPTOELECTRONICS PROGRESS
(2023)
