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Abstract In this paper, a (3+1)-dimensional nonlinear evolution equation and its reduction is studied by use of the Hirota bilinear method and the test function method. With symbolic computation, diversity of exact solutions is obtained by solving the under-determined nonlinear system of algebraic equations for the associated parameters. Finally, analysis and graphical simulation are given to reveal the propagation and dynamical behavior of the solutions. [ABSTRACT FROM AUTHOR]

Rail-guided vehicle is a logistics management device widely used to perform various material handling operations instead of manual labor. In processing scenarios, the dimensions of the material transfer path of a rail-guided vehicle are typically very large, which makes the optimization of the material transfer path very difficult. The transdifferentiation behavior of lower organisms was introduced into the evolutionary algorithm, and a large-scale differential evolution algorithm based on the transdifferentiation strategy was proposed, for achieving high-efficiency processing. This strategy makes it possible for some individuals with poor fitness to reach maturity again and be selected for the next iteration after losing some information and returning to their juvenile stage, which helps maintain the diversity of the population. Simulation results show that the proposed algorithm not only achieves an average 25.68% higher output rate than the comparison algorithms on the test cases but also has an excellent and stable effect distribution level on the extended problem space, which shows that the superiority of the proposed algorithm is not affected by the processing parameters. This research is expected to provide technical guidance for the processing of key components in the ship and aviation manufacturing industries. The code with a 31-page manual is available on our project homepage https://github.com/MLNST-JUST/DE-TS. • Rail-guided vehicle helps to speed up material production. • Transdifferentiation strategy helps to maintain the diversity of the population. • The rail-guided vehicle can control computer number controllers in cooperation. • The optimization of the distribution of CNCs increases the upper limit of output. • The difficulty of optimization increases with the increase of logistics demand. [ABSTRACT FROM AUTHOR]

In order to understand the densification kinetics of a Ti(C 0.7 N 0.3)-WC-Mo 2 C–NbC-(Co, Ni) compact, the linear shrinkages were measured using a horizontal dilatometer at different heating rates (2, 4, and 6 °C/min) in an argon atmosphere. Densification is more efficient when it is sintered at a lower heating rate. A master sintering curve was constructed over a range from the relative density of approximately 0.658–0.816; the corresponding sintering activation energy was 630 kJ/mol. With the aid of an Arrhenius curve, the sintering behaviour of cermet was analysed at different temperatures. The sintering process changed from solid-phase to liquid-phase sintering at approximately 1385 °C. The sintering activation energy turned negative when the temperature exceeded 1385 °C at a heating rate of 2 °C/min due to the formation of a liquid phase, and the exothermic process of dissolution-precipitation. • Compact densification is more efficient when sintering at lower heating rates. • A master sintering curve can be constructed for a combination of powders. • Arrhenius curve shows that the sintering of cermets is a complex process. • Sintering process changes from solid-to liquid-phase at ∼1385 °C. • Activation energy drops above 1385 °C due to liquid phase/dissolution-precipitation. [ABSTRACT FROM AUTHOR]