Pingxiang University

With inner and outer filter parts having the advantage of a more compact structure and a larger area of a single filter cartridge, a three-dimensional numerical simulation model of annular filter cartridge was constructed, and the pulsed-jet performance of annular filter cartridge with array nozzle was investigated. The spatial and temporal distribution of injection pressure in filter core was analyzed; the injection flow field, the induced ratio, and the eddy current under different number (N) of nozzles were compared. The effects of jet angle (α) and jet distance (H) on the pulsed-jet intensity and pulsed-jet uniformity were examined. The results showed that the appropriate number of outlet openings for array nozzles is 4, which corresponds to the induced ratio of 310.4%. With the increase in jet angle, the pulsed-jet intensity first increases and then decreases (the optimal jet angle is α=0°), and the pulsed-jet uniformity first decreases and then increases. With the increase of the jet distance, the pulsed-jet intensity increases first and then decreases (the optimal jet distance is H=250 mm); and the pulsed-jet uniformity was improved. Compared with N=2, the array nozzle can improve the pulsed-jet intensity by 15.5% and the pulsed-jet uniformity by 4.8 times (reducing the coefficient of variation from 0.52 to 0.09) under the optimal parameters (N=4, α=0°, H=250 mm). The research provides a reference for optimizing the performance of the dust collector with annular filter cartridges in space-constrained working environments.

Abstract Elastomeric materials play crucial roles in complex electromechanical systems. However, their inadequate tribological performance under demanding operating conditions often leads to premature failure. This study introduces a multiscale synergistic design concept that introduces fullerene (FLN) and graphene (G) as hybrid fillers within an elastomer matrix, aimed at developing a high-performance elastomeric composite. The FLN/G composite elastomer test blocks were prepared by compounding and thermal vulcanization. Their microstructures, chemical compositions, and tribological properties were systematically characterized over a temperature range of 35 °C to 55 °C. The characterization results revealed that FLN exhibits a nanospherical structure, while G possesses a wrinkled two-dimensional sheet structure. Both materials feature surfaces rich in oxygen-containing functional groups, which significantly enhance their interfacial compatibility with the matrix. Tribological tests demonstrated that, compared to unmodified elastomers and single-filler systems, the FLN/G composite exhibited the lowest friction coefficient and wear volume at both temperatures, indicative of a pronounced synergistic effect. Microscopic morphology analysis of the worn surfaces revealed that the performance enhancement originates from a synergistic “rolling-shielding” lubrication mechanism, facilitated by the “micro-bearing” rolling effect of FLN alongside the sheet shielding and load-bearing effects of G. This study provides a novel design strategy and theoretical foundation for the development of a new generation of high-performance, long-life elastomeric sealing materials.

In this letter, a novel X-band amplifying metasurface with power amplifiers is proposed to enhance the reflected electromagnetic (EM) signals. The amplifying metasurface is designed based on a receiving, amplifying, and polarization-converted reradiating scheme. To ensure wideband performance, a cross-aperture coupled patch unit cell is meticulously designed. According to simulation results, the amplifying metasurface exhibits a gain variation between 0 and 14 dB within the 7.1-9.9 GHz. The designed amplifying metasurface is then fabricated as a prototype and experimentally measured. The experimental measurements demonstrate good agreement with the simulated results. With the increasing demand for the high-capacity network, the proposed amplifying metasurface aligns with the key requirements of future wireless systems, particularly in scenarios requiring dynamic coverage control and signal enhancement.

The highly stereoselective sulfenylative O-glycosylation of glycals, enabled by hexafluoroisopropyl alcohol (HFIP), has been successfully developed for the first time. This methodology is compatible with three types of oxygen nucleophiles, including alkyl alcohols, phenols, and water. Glycal derivatives such as D-galactal, D-arabinal, L-fucal, and d-glucal are suitable substrates for this reaction system. A range of 2-phenylthio-O-glycosides were obtained in moderate to excellent yields with excellent β-selectivity (β:α > 20:1), including those bearing disaccharide structures. The thioether group at the C-2 position of the glycosides can be readily removed to afford the corresponding 2-deoxy-β-glycosides, which were efficiently synthesized in good yields.

The present study examined the design philosophy of Taiji with the objective of developing a novel graphic design approach and substantiating its viability through a practical graphic design implementation. Application of the Taiji design philosophy was examined by using the characters from the Three Kingdoms in a graphic design practice as a case study. The objective was to assess the practicality and effectiveness of this design approach. The outcome of the research and subsequent discussion indicates that the Taiji design philosophy represents a novel framework for interdisciplinary investigation, encompassing a design methodology centered around the principles of yin and yang contrast as well as harmony and unity. The present findings hold significance in at least two distinct manners. One of the primary objectives was to illustrate how Taiji, when viewed as a philosophical concept, offers a systematic approach for the development of graphic creativity. Additionally, the yin-yang contrast and virtual-real relationship inherent in the Taiji design philosophy facilitate the transformation of two-dimensional space into a three-dimensional visual design concept for graphic designers. Undoubtedly, numerous issues regarding the underlying principles of Taiji’s design philosophy remain unresolved.