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Design, Construction, and Evaluation of a Precision Vegetable Reaper to Use in Small Plots
Bagherpour Hossein,Talab Mohammad Mahdi Sadeghi 한국농업기계학회 2024 바이오시스템공학 Vol.49 No.1
Purpose In this study, a miniature and lightweight reaper that can harvest vegetable in small plots and does not damage the dedicated stems and roots of plants were designed and constructed. Methods For the design of the vegetable reaper, an initial step involved the calculation of the resisting forces for blade movement. Determination of engine power and the pully size of the simple power transmission system were conducted based on knife speed and the required cutting power. To evaluate machine performance, three important performance variables including eff ective fi eld capacity (EFC), cutting effi ciency (CE), and plant damage (PD) were assessed under fi eld conditions. In this evaluation, three variables of forward speed (0.8, 1.2, and 1.8 km/h), knife speed (3 and 4 m/s), and cutting height (3 and 5 cm) were assessed. Results The results indicated that the forward speed had a signifi cant eff ect on all three performance variables of the machine. Although the highest EFC was achieved at a speed of 1.8 km/h, the optimum values of CE and PD were obtained at the forward speed of 0.8 km/h. A cutting height of 3 cm and a blade speed of 4 m/s were chosen for this machine. To have a continuous rotation of the star-wheels, 5 teeth star-wheel provided the best performance compared with other shapes. Conclusions Using the light-weight vegetable reaper can reduce the crushing or damaging of the roots or stems as well as easing the harvesting process compared to manual methods. Because the vegetable plots are very small and the machine could be moved by the operator, eliminating the gearbox greatly reduced the slippage of the driving wheels and reduced damage to the dedicated stems.
Esmaeel A. Bagherpour,Mohammad-Reza Ha’iri-Yazdi,Mohammad J. Mahjoob 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.12
In this paper, we deal with residual vector generation for fault detection problems in linear systems via unknown input observer (UIO)when the so-called observer matching condition is not satisfied. Based on the relative degree between unknown input and output, a vectorof the auxiliary output is introduced so that the observer matching condition is satisfied with respect to the vector. Auxiliary outputs arerelated to the derivatives of measured signals. However, differentiation leads to excessive amplification of measurement noise. A dynamicallyequivalent configuration of linear systems is developed using successive integrations to avoid differentiation. As such, auxiliaryoutputs are constructed without differentiation. Then, the equivalent dynamic system and its corresponding auxiliary outputs are used togenerate the residual vector via an exponentially converging UIO. Fault detection in the generated residual vector is also investigated. Finally, the effectiveness of the proposed method is shown via numerical simulation.
S. Najmedin Almasi,Raheb Bagherpour,Reza Mikaeil,Yilmaz Ozcelik 한국자원공학회 2017 Geosystem engineering Vol.20 No.6
Predicting the sawability of dimension stone is one of the most important factors in the optimized design and cost estimation of quarrying. This paper aims to predict the cutting rate of diamond wire saw (DWS) as main performance criteria. For this purpose, a classification system for ranking the sawability of hard dimension stone based on the toughness, abrasiveness, and hardness of rock was initially developed, and a Hard Dimension Stone Sawability index (HDSSi) was defined. Then, by means of multiple curvilinear regression analysis, the data were analyzed and the relationship between the cutting rate with the HDSSi, and pullback amperage was obtained with a high correlation coefficient (.846) in data training, and .801 in data test. Validation of the model was carried out by considering the t-test, F-test, and the coefficient of determination. During this research, varieties of 11 types of hard rock were cut in a laboratory using a DWS and a fully instrumented cutting platform at different pullbacks. The results show that the cutting rate of hard dimension stones with a DWS can be successfully predicted using the developed model.
The influence of socioeconomic factors on deceased organ donation in Iran
Elahe Pourhosein,Farzaneh Bagherpour,Marzieh Latifi,Maryam Pourhosein,Gholamreza Pourmand,Farshad Namdari,Naghmeh Pourmand,Parisa Ghaffari,Sanaz Dehghani 대한이식학회 2022 Korean Journal of Transplantation Vol.36 No.1
Background: There is a large gap between the number of patients on organ waiting lists and the number of available organs for donation. This study investigated the socioeconomic factors in Iran that influenced decisions for organ donation among the families of brain-dead donors. Methods: This retrospective cross-sectional study was performed among the families of 333 organ donors in Iran. Two trained researchers interviewed family members about the donor’s age, sex, cause of brain death, education level, marital status, number of children, history of addiction, the financial status of the donor’s family, and reasons for which they considered refusing organ donation. Results: The mean age of the donors was 37.23±16.59 years. During 2017–2019, significant differences were found according to income (P<0.001), marital status (P<0.001), sex (P=0.04), and occupation (P=0.04). More than half of the organ donors were of low socioeconomic status, and nearly half were the sole income earners of large families. Trauma was the most common cause of death (44.6%). The most common reasons for which the families considered refusing organ donation were unfamiliarity with the concept of brain death, denial, and the expectation of a miracle. Conclusions: The donor’s socioeconomic status and availability of social services, such as insurance coverage, psychological services, and mourning therapy courses, play an important role in organ donation. Adequate support for the deceased’s family after organ donation is imperative.
Imanimoghaddam, Mahrokh,Madani, Azam Sadat,Mahdavi, Pirooze,Bagherpour, Ali,Darijani, Mansoreh,Ebrahimnejad, Hamed Korean Academy of Oral and Maxillofacial Radiology 2016 Imaging Science in Dentistry Vol.46 No.2
Purpose: This study was performed to compare the condylar position in patients with temporomandibular joint disorders (TMDs) and a normal group by using cone-beam computed tomography (CBCT). Materials and Methods: In the TMD group, 25 patients (5 men and 20 women) were randomly selected among the ones suffering from TMD according to the Research Diagnostic Criteria for Temporomandibular Disorders (RDC/TMD). The control group consisted of 25 patients (8 men and 17 women) with normal temporomandibular joints (TMJs) who were referred to the radiology department in order to undergo CBCT scanning for implant treatment in the posterior maxilla. Linear measurements from the superior, anterior, and posterior joint spaces between the condyle and glenoid fossa were made through defined landmarks in the sagittal view. The inclination of articular eminence was also determined. Results: The mean anterior joint space was 2.3 mm in the normal group and 2.8 mm in the TMD group, respectively. The results showed that there was a significant correlation between the superior and posterior joint spaces in both the normal and TMD groups, but it was only in the TMD group that the correlation coefficient among the dimensions of anterior and superior spaces was significant. There was a significant correlation between the inclination of articular eminence and the size of the superior and posterior spaces in the normal group. Conclusion: The average dimension of the anterior joint space was different between the two groups. CBCT could be considered a useful diagnostic imaging modality for TMD patients.
Mahrokh Imanimoghaddam,Azam Sadat Madani,Pirooze Mahdavi,Ali Bagherpour,Mansoreh Darijani,Hamed Ebrahimnejad 대한영상치의학회 2016 Imaging Science in Dentistry Vol.46 No.2
Purpose: This study was performed to compare the condylar position in patients with temporomandibular joint disorders (TMDs) and a normal group by using cone-beam computed tomography (CBCT). Materials and Methods: In the TMD group, 25 patients (5 men and 20 women) were randomly selected among the ones suffering from TMD according to the Research Diagnostic Criteria for Temporomandibular Disorders (RDC/ TMD). The control group consisted of 25 patients (8 men and 17 women) with normal temporomandibular joints (TMJs) who were referred to the radiology department in order to undergo CBCT scanning for implant treatment in the posterior maxilla. Linear measurements from the superior, anterior, and posterior joint spaces between the condyle and glenoid fossa were made through defined landmarks in the sagittal view. The inclination of articular eminence was also determined. Results: The mean anterior joint space was 2.3 mm in the normal group and 2.8 mm in the TMD group, respectively. The results showed that there was a significant correlation between the superior and posterior joint spaces in both the normal and TMD groups, but it was only in the TMD group that the correlation coefficient among the dimensions of anterior and superior spaces was significant. There was a significant correlation between the inclination of articular eminence and the size of the superior and posterior spaces in the normal group. Conclusion: The average dimension of the anterior joint space was different between the two groups. CBCT could be considered a useful diagnostic imaging modality for TMD patients.
Measurement of atmospheric tau neutrino appearance with IceCube DeepCore
Aartsen, M. G.,Ackermann, M.,Adams, J.,Aguilar, J. A.,Ahlers, M.,Ahrens, M.,Altmann, D.,Andeen, K.,Anderson, T.,Ansseau, I.,Anton, G.,Argü,elles, C.,Auffenberg, J.,Axani, S.,Backes, P.,Bagherpour, American Physical Society 2019 Physical review. D Vol.99 No.3