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Ergonomic assessment of drivers in MF285 and MF399 tractors during clutching using algometer

Information Processing in Agriculture 2016年第1期3卷 54-60页

作者： Hossein Fallahi Mohammad Hossein Abbaspour-Fard amin Azhari Mehdi Khojastehpour amin nikkhah Department of Biosystems Engineering Ferdowsi University of MashhadMashhadIran Orthopedic Research Center Mashhad University of Medical SciencesMashhadIran

Tractor as one of the most widely used agricultural machinery should be considered from different *** frequent application of clutch and brake pedals and also the steering wheel within farms,along with the unfavorable working conditions,cause negative effects on the occupational health of the tractor ***,in this research,the imposed forces on three engaged muscles including:Gastrocnemius,Trapezius and Quadrate’s lumborum of the tractor drivers during clutching have been *** this regard,algometer device was used to determine the applied forces on selective muscles of drivers during clutching of MF285 and MF399 *** experiments were performed employing sample of 30 drivers and were conducted on two Iranian frequently used tractors including:MF285 and MF399 *** results showed that the clutching forces for MF285 and MF399 tractors were 340 N and 290 N,*** knee angle of the drivers of the two tractors was statistically different at the one percent level of *** reduction of pain threshold after 30 and 60 s clutching and also 60 s rest after clutching in MF285 tractor,for all three muscles,were more than those of MF399 *** impact of clutching on the average decreases of pain threshold,for all drivers and all clutching periods,during and after clutching,in the Quadratus lumborum muscle was more than the other two muscles,in both *** order to reduce the clutching force for MF285 tractor some modifications is *** this regard the force transfer joint between the pedal and the clutch release linkage may be replaced with one made of cast iron.

关键词： Algometer Ergonomic Muscle Operator Tractor

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Life Cycle Assessment modeling of milk production in Iran

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Information Processing in Agriculture 2015年第2期2卷 101-108页

作者： Hamzeh Soltanali Bagher Emadi Abbas Rohani Mehdi Khojastehpour amin nikkhah Department of Biosystems Engineering Ferdowsi University of MashhadAzadi SquareMashhadIran Young Researchers and Elite Club Rasht BranchIslamic Azad UniversityRashtIran

Livestock units are known as one of the most influential sectors in the environment ***,the aim of this study was to investigate the environmental impacts of milk production in Guilan province of Iran through Life Cycle Assessment(LCA)*** primary data were collected from 45 units of milk production through a field survey with the help of a structured *** reliability was assessed using Cronbach’s alpha coefficient and was estimated an acceptable value of *** consumption of resources and emissions were allocated to a functional unit(FU)of one ton of *** of emissions in five impact categories of global warming,acidification,eutrophication,photochemical oxidation and depletion of resources were *** results showed that the characterization index for these impact categories were 1831 kg CO2 eq,7.97 kg SO2 eq,3.42 kg PO4^-3 eq,0.21 kg C2H4 eq and 838.39 MJ,*** indices for these impact categories were calculated as 0.24,0.28,0.076,0.017 and 0.046,*** index(EcoX)and resources depletion index(RDI)were obtained 0.61 and 0.04,*** this study,the highest potential for environmental impacts of production revealed for acidification and followed by global warming impact category.

关键词： Acidification Dairy farm Environmental impact Global warming

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A statistical method for assessment of the existing correlations of hydrate forming conditions

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Journal of Energy Chemistry 2015年第1期24卷 93-100页

作者： Javad Sayyad amin Somayye nikkhah Mehdi Veiskarami Department of Chemical Engineering University of GuilanRasht 41996-13769 Iran Department of Civil Engineering University of Guilan Rasht 41996-13769 Iran Department of Civil and Environmental Engineering School of Engineering (No.1) Shiraz University Shiraz 71348-51156 Iran

Hydrate formation in the oil and gas industries has been a serious problem for a long time. It may cause many difficulties for instance in gas pipelines blockages. In order to determine the hydrate forming condition, gas gravity method has been used. Several correlations have been proposed based on gas gravity method. Checking the accuracy of the applied correlations is important. In this paper, the leverage approach is used for this purpose. Leverage approach is a statistical method for detection outliers which identifies the applicability domain （AD） of hydrate data predicting correlations and the quality of the existing data. Moreover, the Williams plot is sketched, which is a graphical depiction for determination of the doubtful points. The obtained results showed the existing correlations are all statistically correct and valid to predict hydrate formation temperature, just one data point is out of the applicability domains, and none of the experimental data can be chosen as outliers.

关键词： hydrate formation conditions gas gravity method leverage approach outlier detection

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