Intellectual Structure of the Belt and Road Initiative Research: A Scientometric Analysis and Suggestions for a Future Research Agenda

publishedVersio

Intellectual Structure of the Belt and Road Initiative Research: A Scientometric Analysis and Suggestions for a Future Research Agenda

publishedVersio

Design and simulation of magnetorheological polishing excitation device based on permanent magnet

Excitation device is the core component of magnetorheological polishing equipment. whether it can generate a stable and uniform high gradient magnetic field is the key factor determining the success of magnetorheological polishing. The excitation device for the magnetorheological polishing wheel was designed using a sector permanent magnet. Various aspects of the excitation device, including the number of permanent magnets, magnetization modes, arrangement modes, and air gap widths, were simulated and analyzed using ANSYS Electronics Desktop and other softwares. The magnetic induction lines and magnetic induction intensity distribution under different working conditions were obtained. The results show that when the air gap width is 4 mm, the magnetic induction intensity produced by the axial magnetization of a single permanent magnet is the lhighest, reaching 358.4 mT. Theoretically, a polishing ribbon with a width of 26 mm and a height of 6.0 mm can be formed on the surface of the polishing wheel

Integration Design and Optimization Control of a Dynamic Vibration Absorber for Electric Wheels with In-Wheel Motor

This paper presents an integration design scheme and an optimization control strategy for electric wheels to suppress the in-wheel vibration and improve vehicle ride comfort. The in-wheel motor is considered as a dynamic vibration absorber (DVA), which is isolated from the unsprung mass by using a spring and a damper. The proposed DVA system is applicable for both the inner-rotor motor and outer-rotor motor. Parameters of the DVA system are optimized for the typical conditions, by using the particle swarm optimization (PSO) algorithm, to achieve an acceptable vibration performance. Further, the DVA actuator force is controlled by using the alterable-domain-based fuzzy control method, to adaptively suppress the wheel vibration and reduce the wallop acting on the in-wheel motor (IWM) as well. In addition, a suspension actuator force is also controlled, by using the linear quadratic regulator (LQR) method, to enhance the suspension performance and meanwhile improve vehicle ride comfort. Simulation results demonstrate that the proposed DVA system effectively suppresses the wheel vibration and simultaneously reduces the wallop acting on the IWM. Also, the alterable-domain-based fuzzy control method performs better than the conventional ones, and the LQR-based suspension exhibits excellent performance in vehicle ride comfort

Simulation Study of a New Magnetorheological Polishing Fluid Collector Based on Air Seal

Inverted magnetorheological (MR) polishing device mainly use a magnetic sealing ring to collect polishing fluid. This collection method wears the wheel surface of the polishing wheel, affects the surface accuracy of the polishing wheel, and introduces machining error. In order to reduce this wear and improve recovery efficiency, a new type of collector using an air seal is proposed in this paper. Furthermore, testing method using six factors and a three-level orthogonal test table is used to study the structural parameters of the new collector. The flow fields affected by the different structural parameters were simulated, and the corresponding collection efficiency was analyzed. The results show that the air nozzle diameter has the greatest impact on the fluctuation value of the collector outlet flow, followed by the airflow velocity and nozzle spacing. Moreover, the structural parameters obtained from the orthogonal test were optimized using the control variable method. The minimum flow fluctuation and maximum flow at the collector outlet can be obtained when the nozzle diameter is 2.5 mm and the nozzle airflow velocity is 31 m/s

A CSRR-Fed SIW Cavity-Backed Fractal Patch Antenna for Wireless Energy Harvesting and Communication

This paper presents a novel compact dual-band and dual-polarized complementary split-ring resonator (CSRR)-fed substrate-integrated waveguide (SIW) cavity-backed fractal patch antenna for wireless energy harvesting and communication. The proposed antenna is composed of a Giuseppe Peano fractal radiation patch with a backed SIW cavity. To enhance the bandwidth and minimize the dimensions, the CSRR structure is designed to feed the Giuseppe Peano fractal patch orthogonally. A prototype of the proposed antenna is simulated, fabricated and measured. The proposed antenna exhibits good directionality and high cross-polarization level with especially compact size

Comparative liver transcriptome analysis in ducklings infected with duck hepatitis A virus 3 (DHAV-3) at 12 and 48 hours post-infection through RNA-seq

Abstract Duck hepatitis A virus 3 (DHAV-3), the only member of the novel genus Avihepatovirus, in the family Picornaviridae, can cause significant economic losses for duck farms in China. Reports on the pathogenicity and the antiviral molecular mechanisms of the lethal DHAV-3 strain in ducklings are inadequate and remain poorly understood. We conducted global gene expression profiling and screened differentially expressed genes (DEG) of duckling liver tissues infected with lethal DHAV-3. There were 1643 DEG and 8979 DEG when compared with mock ducklings at 12 hours post-infection (hpi) and at 48 hpi, respectively. Gene pathway analysis of DEG highlighted mainly biological processes involved in metabolic pathways, host immune responses, and viral invasion. The results may provide valuable information for us to explore the pathogenicity of the virulent DHAV-3 strain and to improve our understanding of host–virus interactions