Noise evaluation of MF285 tractor while pulling a trailer in an asphalt road

Tractors have been used for transportation on roads by many farmers in addition to use in the field operations. MF285 tractor is the popular kind of tractor in Iran (about 30% of all tractors) and almost this tractor has been used without cabin.  Despite the problems caused by noise from the tractors and all its adverse effects on users and observers, no comprehensive research has been done on them.  The result of this research indicate that the noise level of MF285 tractor, in 2250 r/min engine speed, will be 90 dB(A) which in comparison with the standard value, 85 dB(A), is dangerous for operator’s ears.  The test site was prepared according to the international standards.  The noise emitted by tractor in three gears (2, 3 and 4) and three speeds (1,500, 1,950 and 2,250 r/min) were measured and then analyzed statistically.  Analysis of variance and Duncan’s mean comparison test showed that the Sound Pressure Level (SPL) at the position of the driver in comparison to the observer position was statistically significant (

Application of lysine imprinted polymer as carbon dioxide colorimetric indicators for food packaging

Carbon dioxide is highly produced by microbial spoilage of food. Thus, the freshness of the marketed products can be represented by sensors visually highlighting the existence of CO2 within the food packages as labels. In the present work, FTIR and SEM, and XRD were used to synthesize and characterize l-lysine imprinted polymers. Then, it was utilized as a biosensor for CO2 sensing under phenyl red. By investigating its performance under CO2 gas, its applicability was proved via this synthesized biosensor for spoilage monitoring of packaged minced beef. The aerobic psychrotrophic count (PTC), aerobic plate count (APC), and Enterobacteriaceae counts were monitored to assess the samples’ microbial quality in this period. The results revealed that the synthesized biosensor can act as a prevailing senor to monitor meat quality and imprint lysine on this polymer thus improving and catalyzing its reversible performance