A ZrB₂–copper–graphite composite was produced through powder metallurgy and was tested as a new electric brush material. The aim of this paper was to study the effect of ZrB₂ addition on the composite’s properties. Besides its physical properties such as density and resistivity, its mechanical properties, such as hardness, bending strength and wear resistance, were studied. A scanning electron microscope (SEM) was used to study the morphology of the wear surface, and a configured energy-dispersive spectrometer (EDS) was used to research the chemical composition of the samples. The results showed that, with the addition of ZrB₂, the composite’s properties such as density, resistivity, hardness, and bending strength improved significantly. Compared with samples without ZrB₂, samples with the addition of 4% ZrB₂ achieved a hardness of 87.5 HRA, which was improved by 45.8%, and a bending strength of 53.1 MPa, which was increased by nearly 50.0%. Composites with 1% content of ZrB₂ showed the best wear resistance under non-conductive friction; however, under conductive friction, composites with 4% content of ZrB₂ showed better wear resistance.

Cross-border e-commerce (CBEC) is rapidly growing as a global trade engine. Simultaneously, its rapid expansion also poses environmental challenges and worsens supply chain sustainability. Advanced information technology (IT) significantly enhances supply chain visibility and promotes cooperation, thereby improving the efficiency and sustainability of CBEC supply chains. However, the application of IT is accompanied by an increase in service costs, necessitating a comprehensive balance for enterprises. This paper constructs a CBEC supply chain consisting of an overseas supplier and two merchants, where one merchant adopts advanced IT to provide differentiated services. A game-theoretic model is employed to analyze the IT application decisions under price and service competition in supply chain members’ cooperative and non-cooperative scenarios. The results indicate that service differentiation generated by advanced IT is influenced by consumer preferences. Merely applying advanced IT may not necessarily improve competitiveness and efficiency, and may even lead to negative utility. When the products sold are similar and the service cost coefficient is constant, those who apply advanced IT to provide higher service levels can gain competitive advantages and obtain more profits. When the service differentiation between merchants is constant, CBEC supply chains implementing centralized strategies can achieve greater profits.

In order to ensure the vehicle management system (VMS) satisfy the RE and CE standards which are required by national regulations, the EMC design method is necessary to be integrated into the controller PCB design flow. Through filtering for signal line and decoupling for power system on VMS based on MPC555, the properties of VMS’ EMC are improved. With spectrum analyzer and EMSCAN near-field scanner, the feasibility of Antiinterference measures is verified. The VMS passed the CE test level 5 and the RE test level 4 in CISPR25: 2002.