Introduction:     women's  employment  is one of the fundamental problems in breastfeeding. Studies have shown that after delivery, amount of milk is  equal in the mothers working and non-working. But  after several   months will be reduced markedly. Methods: In this study, with different departments was done coordination , and interviewed with the 351 mothers that had children under two years...

We revisit classical sieves for computing primes and analyze their performance in the external-memory model. Most prior sieves are analyzed in the RAM model, where the focus is on minimizing both the total number of operations and the size of the working set. The hope is that if the working set fits in RAM, then the sieve will have good I/O performance, though such an outcome is by no means gua...

The article presents the analysis how actual coal dust explosion hazard is at distance of initial 200 metres safety zone maintained along entire length driven inclined drift II – face 567 in BRZESZCZE colliery, which was used during realization project titled Modelling mechanism explosive deposition vicinity mined faces terms identification, assessment and levelling possibility its financed by ...

A powered roof support is an element of a longwall complex. It connected with scraper conveyor by sliding system. The carries shearer mining the coal. second function to protect excavation against uncontrolled impact rock mass. This paper focuses on analysis effectiveness support. main objective determine factors influencing failure-free operation in exploitation process. Moreover, author discu...

Abstract There were 37 longwall faces operating in mines the United States 2019. The average panel width for these longwalls was approximately 368.5 m (1209 ft). This translates to a range of 170–240 shields per longwall, depending upon shield. movement is significant contributor respirable dust overexposures operators. Foam expected have potential reduce this shield generation. foam applied ar...