Iranian Research Organization for Science and Technology (IROST) Innovative Food Technologies 2783-350X 6 3 2019 04 21 Determination of pear bruises due to a thin edge compression load by CT scan method Determination of pear bruises due to a thin edge compression load by CT scan method 305 321 700 10.22104/jift.2018.2842.1684 FA Mohsen Azadbakht Associate Professor of Department of Bio-System Mechanical Engineering, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran. 0000-0002-5726-9321 Mohammad Vahedi Torshizi Msc. Student of Department of Bio-System Mechanical Engineering, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran. 0000-0003-3648-1515 Mohammad Javad Mahmoodi Msc. Student of Department of Bio-System Mechanical Engineering, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran. Journal Article 2018 04 04 In this research via CT scan, the relationship between physical properties of pears and storage times with bruise due to loading force was investigated. Before loading and storing, 50 pears were examined using CT scan and 27 pears with zero bruise percentage were selected. Dimensions of pears (length, width, thickness) were measured, then properties such as the equivalent diameter, geometric mean diameter, spherical coefficient, surface area and aspect ratio of calculus were calculated, then selected pears were subjected to quasi-static loading with a thin edge pressure with three forces of 15, 20 and 25 N and 5, 10 and 15 days storage was used to investigate the effect of forces on pears. Then, after loading and storing, using the CT scan in each period of storage, the rate of pear bruise was calculated. The results of the experiments showed that there is an inverse relation between geometric diameter, arithmetic and equivalent diameter, spherical coefficient and aspect ratio with the bruise percentage. Also, a direct and unreasonable relationship between the level of the surface area and the percentage of bruising was obtained. Also, according to the obtained results, during the 5-day storage period, the amount of geometric diameter, arithmetic and equivalent diameter, spherical and aspect ratio on the percentage of bruising were not significantly affected and percentage of bruising can be almost zero and with increasing storage, the above parameter's will affect the percentage of bruising. In this research via CT scan, the relationship between physical properties of pears and storage times with bruise due to loading force was investigated. Before loading and storing, 50 pears were examined using CT scan and 27 pears with zero bruise percentage were selected. Dimensions of pears (length, width, thickness) were measured, then properties such as the equivalent diameter, geometric mean diameter, spherical coefficient, surface area and aspect ratio of calculus were calculated, then selected pears were subjected to quasi-static loading with a thin edge pressure with three forces of 15, 20 and 25 N and 5, 10 and 15 days storage was used to investigate the effect of forces on pears. Then, after loading and storing, using the CT scan in each period of storage, the rate of pear bruise was calculated. The results of the experiments showed that there is an inverse relation between geometric diameter, arithmetic and equivalent diameter, spherical coefficient and aspect ratio with the bruise percentage. Also, a direct and unreasonable relationship between the level of the surface area and the percentage of bruising was obtained. Also, according to the obtained results, during the 5-day storage period, the amount of geometric diameter, arithmetic and equivalent diameter, spherical and aspect ratio on the percentage of bruising were not significantly affected and percentage of bruising can be almost zero and with increasing storage, the above parameter's will affect the percentage of bruising. https://jift.irost.ir/article_700_e5841df2166dd424a57127423d276bbe.pdf