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Open access

Amin Taheri-Garavand, Shahin Rafiee, Alireza Keyhani and Esmaeel Mirzaee

A Traveling Time Model as Function of Water Density and Vegetable Size, Shape and Density

In this research, the possibility of using the rising and dropping time of vegetables through water as a means of hydro-sorting of tomato and potato was studied. The dropping time of potato and rising time of tomato were theoretically formulated and then determined experimentally using water column. The best models for dropping time of potato (cv. Analytic) and rising time of tomato (cv. Rio grand s) as a function of water and vegetable densities, shape factor and vegetable volume were modelled with determination coefficients of 0.95 and 0.91, respectively. It was found that difference between vegetables and water densities had major effect on rising and dropping time. It can be concluded that in the sorting systems, difference in terminal velocities of vegetables can be used as a suitable factor for design the sorting system devices.

Open access

Morteza Zangeneh, Peter Nielsen, Asadolah Akram and Alireza Keyhani


The aim of this paper is comparing all possible scenarios to improve the performance of agricultural supply chain (ASC). For this purpose, at first all scenarios is discussed and the main constraints, i.e. available budget and time, is considered. In this study the drivers to improve the performance of ASC is select and distribute the best agricultural service packages in the target ASC. All discussed scenarios need a selection procedure. So a multilevel approach is developed to select the best service package for each scenario. All selection methods are based on performance measurement which had been selected in first level of the approach. Fuzzy decision making and Analytic Hierarchy Process have been used for the approach. A numerical example is solved at the end of the paper to show the capability of the approach and comparing the scenarios.