with the collaboration of Iranian Society of Mechanical Engineers (ISME)
ANN-based Modeling of Sunflower Threshing Process and Defining the Optimal Operation Point for Separation Efficiency

P. Ghiasi; A. Masoumi; A. Hemmat; Gh. Najafi

Volume 10, Issue 1 , 2020, , Pages 73-82

https://doi.org/10.22067/jam.v10i1.76264

Abstract
  Harvesting is one of the most important field operations in sunflower production. Seed damage and low separation efficiency are the top concerns of harvesting sunflower. In this study, a threshing cylinder with rubber teeth and a concave for harvesting sunflower were designed and evaluated. The variable ...  Read More

Assessment of Mechanical Damage on Olive Fruit under Impact Loading

H. Kargarpour; T. Tavakoli Hashjin; A. Hemmat; B. Ghobadian

Volume 8, Issue 2 , 2018, , Pages 365-376

https://doi.org/10.22067/jam.v8i2.62488

Abstract
  Introduction The olive fruit (Olea europaea L.) is so sensitive to impact like many other crops that would lead to mechanical damage and bruising which reduce the quality of it. The olive fruit damage includes a brownish bruise at the bruised location. Most mechanical impact damage occurs during harvesting, ...  Read More

Effect of Adding Sugarcane Bagasse and Filter Cake and Wetting and Drying Cycles on Pre-Compaction Stress of Soil

Z. Nemati; A. Hemmat; M. R. Mosaddeghi

Volume 8, Issue 1 , 2018, , Pages 55-66

https://doi.org/10.22067/jam.v8i1.61479

Abstract
  Introduction The compaction of soil by agricultural equipment has become a matter of increasing concern because compaction of arable lands may reduce crop growth and yield, and it also has environmental impacts. In nature, soils could be compacted due to its own weights, external loads and internal forces ...  Read More

Online weighing of kiwifruit using impact method

S. M. Mir-ahmadi; S. A. Mireei; M. Sadeghi; A. Hemmat

Volume 6, Issue 1 , 2016, , Pages 163-175

https://doi.org/10.22067/jam.v6i1.33683

Abstract
  Introduction: Iran is one of the main producers of kiwifruit in the world. Unfortunately, the sorting and grading of the kiwifruits are manual, which is a time consuming and labor intensive task. Due to the lack of appropriate devices for sorting and grading of kiwifruit based on the quality parameters, ...  Read More

Modeling
Viscoelastic modeling of apples under quasi-static loading using finite element method to investigate the causes of bruising

B. Ghasemi; A. Hemmat; A. Ghasemi; A. Habibi Rad

Volume 5, Issue 2 , 2015, , Pages 302-312

https://doi.org/10.22067/jam.v5i2.28262

Abstract
  Introduction: Apple is one of the most important horticultural crops of Iran. Its production in the country stands in the second place after citrus. Iran holds the fourth place in the world production of apples and gains a major share in the export of this product. Therefore, it is necessary to enhance ...  Read More

Field Performance of the Disk Harrow, Power Harrow and Rotary Tiller at Different Soil Moisture Contents on a Clay Loam Soil in Mazandaran

M. Rajabi Vandechali; A. Hemmat; A. Ghanbari Malidarreh

Volume 5, Issue 1 , 2015, , Pages 63-72

https://doi.org/10.22067/jam.v5i1.28070

Abstract
  About 60% of the mechanical energy consumed in mechanized agriculture is used for tillage operations and seedbed preparation. On the other hand, unsuitable tillage system resulted in soil degradation, affecting soil physical properties and destroying soil structure. The objective of this research was ...  Read More

Study of Changes in Rheological Properties of Potato Tissue During Storage Using the Creep Test

A. Ghasemi; A. Ghodarzi; A. Hemmat

Volume 4, Issue 2 , 2014, , Pages 305-313

https://doi.org/10.22067/jam.v4i2.34819

Abstract
  The changes in viscoelastic properties of potatoes (Tubuls Agria) stored at 4 ˚C for 4 months were modeled and evaluated by using the creep-recovery test. Cylindrical specimens with 15 mm in diameter and 35 mm long were used. The samples were allowed to deform gradually under the constant stress (110 ...  Read More

Design and Construction
Design, Development and Evaluation of a Pneumatic Seeder for Automatic Planting of Seeds in Cellular Trays

E. Movahedi; M. Rezvani; A. Hemmat

Volume 4, Issue 1 , 2014, , Pages 65-72

https://doi.org/10.22067/jam.v4i1.33166

Abstract
  For planting fine seeds in cellular trays, an automatic pneumatic seeder was designed, constructed and evaluated. CATIA software was used to design and analysis the system parts of the seeder. Different parts of the seeder, including vibrating seed hopper, vacuum boom, seed picking nozzles, seed tube, ...  Read More