in this paper, a non-isothermal two-phase flow in the cathode gas diffusion layer (gdl) of pem fuel cell is modeled. the governing equations including energy, mass and momentum conservation equations are solved by numerical methods. also, the optimal values of the effective parameters such as the electrodes porosity, gas diffusion layer (gdl) thickness and inlet relative humidity are calculated...

Speed is a central value for emergency logistics stakeholders. Emergency response literature makes a compelling case for rapid logistics processes to provide goods and services in humanitarian emergencies. However, speed is not a well-defined concept. While situational demand contributes to the need for speed, an important factor is the perception of speed given the experience of the response s...

Emergency logistics routing problem, which is premise with the time requirements for emergency logistics and aims at maximum saving delivery time for relief supplies, is a reasonable arrangement of vehicles to run routes. According to the characteristics of time which emergency logistics emphasis on, the delivery route optimization model which the number of delivery vehicles less than demand ar...

In order to reduce the cost pressure on cold-chain logistics brought by the carbon tax policy, this paper investigates optimization of Vehicle Routing Problem (VRP) with time windows for cold-chain logistics based on carbon tax in China. Then, a green and low-carbon cold chain logistics distribution route optimization model with minimum cost is constructed. Taking the lowest cost as the objecti...

A new problem about the supply chain resource integration and optimization in mass customization (MC) by the fourth party logistics (4PL) is analyzed in this paper. On this basis, a dynamic and multi-objective optimization model and an algorithm are set up for the decision optimization of the supply chain resource integration in mass customization by 4PL. The optimization model and the algorith...

Considering the challenges of short product life cycles and growing variant diversity, cost minimization and manufacturing flexibility increasingly gain importance to maintain a competitive edge in today’s global and dynamic markets. In this context, an aerodynamic part feeding system for high-speed industrial assembly applications has been developed at the Institute of Production Systems and L...

In this research, we develop a fuzzy multi-objective mathematical model to identify and rank the candidate suppliers and find the optimal number of new and refurbished parts and final products in a reverse logistics network configuration. This modeling approach captures the inherent uncertainty in customers’ demand, suppliers’ capacity, and percentage of returned products as well as existence o...

The objective of this research is to develop a science base and integrative technologies for implementing a scalable and secure hub for reverse logistics e-commerce. The proposed system consists of a transactions hub called the Management and Archival (MA) subsystem and a product information database referred to as the Product Design Advisory (PDA) subsystem. In the initial phase of exploratory...