The oxygen reduction reaction (ORR) is paid much more attention because of the high overpotential required for driving the four-electron process in the field of storage and sustainable energy conversion, including fuel cell applications. In this paper, PtCo nanoparticles encapsulated on carbon supports were prepared by a simple modified polyol method with ethylene glycol. Structural as well as electrochemical characterizations illustrated that the PtCo/C electrocatalysts had a minimum particle size of 4.8 nm, which is close to the commercial 40 wt% Pt/JM. Moreover, the electrochemical measurements indicated that ORR activity was competitive with the commercial 40 wt% Pt/JM catalyst. The synthesis method is a critical way to produce PtCo/C catalysts for use in polymer electrolyte membranes in fuel cells (PEMFCs).

Based on the analysis of the generating mechanism of cylindrical gear with arcuate tooth trace, a new way of modelling for manufacturing was proposed to solve the long-existing inconsistencies between three-dimensional modelling and the actual manufacturing processing and to ensure the correctness of follow-up analysis with the finite-element method and gear machining. Adopting the approach of gear blank’s rolling feed and gear cutting tool’s rotary, the three-dimensional model of the cylindrical gear with arcuate tooth was built. Also, the relationship between nominal radius of tool and bending strength of the cylindrical gears with curvilinear shape teeth is discussed by using the finite-element method. The finite-element analysis results revealed that tooth bending strength of cylindrical gear with arcuate tooth trace has a close relationship with tooth line radius. Therefore, the approach sets a good example of the establishment on strength theory and the design of processing, and provides theoretical basis and guidelines for industrial applications of cylindrical gear with arcuate tooth trace.

The commercialization of proton-conducting fuel cells (PCFCs) is hindered by the limited electroactivity and durability of cathodes at intermediate temperatures ranging from 400 to 700 °C, a challenge exacerbated by an insufficient understanding of high-entropy perovskite (HEP) materials for oxygen reduction reaction (ORR) optimization. This study introduces an yttrium-doped HEP to address these limitations. A comparative analysis of Ce_0.2−xY_xBa_0.2Sr_0.2La_0.2Ca_0.2CoO_3−δ (x = 0, 0.2; designated as CBSLCC and YBSLCC) revealed that yttrium doping enhanced the ORR activity, reduced the thermal expansion coefficient (19.9 × 10⁻⁶ K⁻¹, 30–900 °C), and improved the thermomechanical compatibility with the BaZr_0.1Ce_0.7Y_0.1Yb_0.1O_3−δ electrolytes. Electrochemical testing demonstrated a peak power density equal to 586 mW cm⁻² at 700 °C, with a polarization resistance equaling 0.3 Ω cm². Yttrium-induced lattice distortion promotes proton adsorption while suppressing detrimental Co spin-state transitions. These findings advance the development of durable, high-efficiency PCFC cathodes, offering immediate applications in clean energy systems, particularly for distributed power generation.

Titanium alloy TC4 has excellent mechanical properties and corrosion resistance, and is widely used in aerospace, medical devices and other fields. However, its difficult machinability leads to large cutting forces and severe tool wear. Its inherent low thermal conductivity, low elastic modulus and work hardening characteristics easily cause problems such as cutting overheating and poor surface machining quality during the cutting process, affecting processing efficiency and quality. Based on support vector machine (SVM) technology and through orthogonal experimental design, this paper selects appropriate design parameter sample points to design a prediction model, builds a cutting force prediction model for TC4 titanium alloy, and optimizes the cutting parameters. The research results show that the SVM model can effectively predict cutting force, and the optimized cutting parameters significantly reduce cutting force and improve processing efficiency.

This paper aimed at the key problems which the monitoring and fault diagnosis of process system generated in the high performance composite components manufacturing, established a new type of second-order bistable model, proposed a kind of adaptive stochastic resonance noise reduction method based on the model, and experimented to verifiy, it has very good detection effect and higher operation effect.

Based on the analysis of arc tooth cylindrical gear forming principle and on the basis of existing processing methods, also combined with the principle of ordinary milling knife plate rotating, This paper puts forward an improved double-edged milling method of the Arc tooth cylindrical gear, which include two aspects: one is the double edged sword substance milling gear, double-point tool forming tooth at a time, with the module gear form point contact transmission vice; The second is to use double tooth gear milling tool, cutting tool a tooth, the gear machining and broadsword dish of double edge milling gear transmission line contact vice. It concluded that the improved processing technology is more advanced, the method of production is more efficient.