chainsaw is an important machine for tree felling limbing and bucking in hyrcanian forest and the major problems related to using forest machines was sound intensity. the aim of this study was to measure the sound level in occupational exposure of workers, determine the exposure time of workers and comparison of the variables among the workers. this study was carried out in namkhaneh district i...

BACKGROUND Studies have shown that the growth status of the children with working mothers is about 2 standard deviations lower than that of the children of housewife mothers. It seems that absence of mothers in the second stage of nutritional evolution (attachment), which is a very sensitive stage, has an important role in initiating and continuation of an appropriate supplemental feeding. MA...

To eliminate the shortcomings of known hydraulic autoregulators water level, together with Ya. V. Bochkarev, we developed a design autoregulator level flexible working bodies, combined an automatic gate for washing sediments, which provides discharge floating bodies and bottom sediments in front partition structure. ensure stable vibration-free operation this hydro-automatic controller, task wa...