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RISS 인기검색어
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- 저자 : Hadi Azimi (검색결과 3 건)
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Simulation of Draught Force During Chisel Ploughing Using Discrete Element Method
Rahmanian-Koushkaki Hossein,Mahmoodi-Eshkaftaki Mahmood,Azimi-Nejadian Hadi 한국농업기계학회 2022 바이오시스템공학 Vol.47 No.2
Purpose Chiseling is an essential tillage practice in conservation tillage systems. One of the main methods in soil–tool behaviour analysis of a tillage implement like chisel plough is numerical simulation. The discrete element method (DEM) is one of the most powerful techniques for this purpose. In this study, draught force of a mounted type chisel plough with nine C-shanks was predicted using DEM when working in a clay-loam soil. Methods The effects of forward speed (3, 4 and 5 km h-1) and working depth (10, 15 and 20 cm) on the draught force were investigated. The available commercial EDEM software was used for the simulations, and combination of hysteric spring with cohesion/adhesion forces was employed as the contact model. Results The numerical results were compared to experimental trials and well-known analytical model (McKyes and Ali) results. The experimental results were obtained to be within 3.24–34.9% and 9–35% larger than DEM-simulated and analytical calculated draught, respectively. A regression equation was developed in accordance with the simulated data. According to the values of statistical parameters (R2, RMSE and MRD), the established model had good accuracy. Conclusions From the simulations, it was concluded that draught force increased with an increase in working depth and forward speed. Also, it was found that the DEM results had higher accuracy than analytical results.
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Baghooee Melika,Karparvarfard Seyed Hossein,Azimi-Nejadian Hadi,Keramat-Jahromi Mahdi,Balanian Hossein,Sardarpour Farhang 한국농업기계학회 2023 바이오시스템공학 Vol.48 No.4
Purpose The seed-metering device is an essential component of the precision seeding process since it ensures accurate metering and placement of the seeds. In this study, the performance of a new slotted roller seed-metering device, used in Balanian and Karparvarfard’s (Balanian and Karparvarfard, Iranian Journal of Biosystems Engineering 51:305–317, 2020) study, was simulated in EDEM software to predict the performance and mass flow rate of the optimized condition and compare the results with the experimental data. Methods To achieve this, EDEM simulation results were compared with those obtained from the laboratory tests and the limitations of the simulation were found and discussed. The number of slots (N), angle of the mouth, and rotational velocity (n) were used in Design Expert to develop an optimized model with a high desirability rating. Results The study suggests that the metering device position in simulations may have been over-predicted due to the use of divided time steps, potentially leading to higher miss index values. Additionally, the experiments showed that the variation in grain dimensions resulted in increased multiple index values. The predicted optimized model was similar to the model obtained from the experiments which confirm EDEM was successful in predicting the device’s performance and demonstrates the utility of simulation tools in predicting and optimizing the device’s design. Conclusion This approach can significantly reduce costs and save time in the development of an optimized slotted roller seed-metering device for maize planting.
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Mohammad Hassan Heidari,Abolfazl Movafagh,Mohammad Amin Abdollahifar,Shabnam Abdi,Mohamadreza Mashhoudi Barez,Hadi Azimi,Afshin Moradi,Amin Bagheri,Matineh Heidari,Jafar Hessam Mohseni,Maryam Tadayon 대한해부학회 2017 Anatomy & Cell Biology Vol.50 No.1
Prostate cancer is the most common cancer type in men and is the second cause of death, due to cancer, in patients over 50, after lung cancer. Prostate specific antigen (PSA) is a widely used tumor marker for prostate cancer. Recently, PSA is discovered in non-prostatic cancer tissues in men and women raising doubts about its specificity for prostatic tissues. PSA exists in low serum level in healthy men and in higher levels in many prostate disorders, including prostatitis and prostate cancer. Thus, a supplementary tumor marker is needed to accurately diagnose the cancer and to observe the patient after treatment. Recently, soluble human leukocyte antigen-G (sHLA-G) has been introduced as a new tumor marker for different cancer types, including colorectal, breast, lung, and ovary. The present descriptive-experimental study was carried out including patients with malignant prostate tumor, patients with benign prostate tumor, and a group of health men as the control group, as judged by an oncologist as well as a pathologist. After sterile blood sampling, sHLA-G was measured by enzyme-linked immunosorbent assay in each group. The data was then analyzed using one-way ANOVA. P≤0.05 was considered as statistically significant. The results showed that the mean of sHLA-G level was high in patients. Also, it was found that there was a significant difference in sHLA serum level between the three groups. The data revealed that sHLA-G can be a novel upplementary tumor marker in addition to PSA to diagnose prostate cancer.
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