The distribution of emergency perishable materials is crucial for rescue operations in disaster-stricken areas. However, the freshness of these materials changes over time, affecting the quantity of materials that can be distributed to demand points at different stages. To address this issue, this paper proposes a novel approach. Firstly, a piecewise function is constructed to describe the impact of freshness on the quality and quantity of emergency perishable materials at different time stages. Secondly, the paper establishes a vehicle distribution optimization model with the goal of maximizing the sum of the freshness of all emergency perishable materials delivered to different disaster-affected locations, taking into account the different minimum freshness constraints for the same kind of materials in different locations. Thirdly, an approximate algorithm is designed to solve the model, with the time complexity and the upper and lower bounds of the approximate ratio analyzed. Finally, an example analysis is conducted to demonstrate the validity of the proposed model and algorithm.
With the application of various high-power electronic devices to improving aircraft comprehensive performance, there has been significant interest in the use of high heat flux dissipation technology to maintain an effective and safe operation for electronic devices. This paper presents a numerical study on the thermal and electrical performance of the avionics server module by using single-phase immersion cooling technology with flow distributor and investigates the influence of heat dissipation capacity on the thermal performance of the avionics server module and DC IR-drop of printed circuit board power distribution network (PDN). The simulation results showed that a higher dielectric fluid flow rate can be provided b flow distributor with the same pumping power, and the maximum temperature of the hot spot was 4~8 °C lower than the module without flow distributor. The result confirmed the improved flow performance and enhance heat transfer of hot spot for the module with flow distributor. However, the module without flow distributor showed better comprehensive cooling performance with about 10~15% reduction in average Nusselt number with an increase in Re. The discrepancy of PDN DC IR-drop under different Re was constant at 3% for different design geometries which means the effect of flow distributor on power delivery capability can be neglected.
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