Sharif Digital Repository

Distribution of goods by vehicle routing with split delivery and effective usage of trucks are two important problems which are useful separately and could be applied for different kinds of depots with different trucks to satisfy customers’ demand. Combination of these two NP-hard problems can play a great role to decrease transportation cost. Complexity of this problem is so much that we cannot solve big-size problems by exact methods or branch and bound method in limited time. We introduce metaheuristics methods such as Tabu Search, Simulated Annealing and Ant Colony Optimization which have been presented before, concisely. We present various constraints in routing and distribution,... 

A study has been carried out on the formation of TiB2 particles in an aluminum based in-situ metal matrix composite by mixing master alloys containing Ti and B i.e., Al-10Ti and Al-8B with a Ti:B weight ratio of 5:2. It was shown that the microstructure of the composite was greatly affected by the controlling factors of the in-situ reaction like temperature, reaction time and stirring of the melt. An increasing reaction time leads to the dissolusion of the primary phases (AlB2 and Al3Ti) and the increase in TiB2 volume fraction. Optical microscope and SEM images were used to study these changes and XRD analysis was applied to confirm these observations. The act of melt stirring in short... 

Distribution network is a part of the country’s economic that its structure is affected by economic evolutions. Improper operation and irrational structure of distribution system increases the price of goods and services and creates discontent and makes unreasonable expectations in producers and consumers. In addition, it causes severe fluctuations of price, loses of resources, lack of clarity, reduction of purchasing power, turmoil in market operation, and creation of unofficial distribution networks in society. This investigation focuses on analysis of distribution part of dairy products and tends to evaluate prices and presents solutions to reform prices of distribution. This research...