Proto-neutron stars forming a few seconds after core-collapse supernovae are hot and dense environments where hyperons can be efficiently produced by weak processes. By making use of various state-of-the-art supernova simulations combined with the proper extensions equations state including $\Lambda$ hyperons, we calculate cooling star induced emission dark particles $X^0$ through decay $\Lambd...

this study was carried out to evaluate tobacco dust concentration and also designing a suitable ventilation system for reduction of tobacco dust concentration in a tobacco processing factory in the north of iran.gravimetric method was used to determine the tobacco dust concentrations in the emission sources an also indoor workplace. a local exhaust ventilation system was designed according to t...

background: passive or environmental smoking is one of the important health problems, to which many adults and children are exposed in involuntary status. methods: in this hospital based case-control study, household exposure to tobacco smoke as an estimate of passive smokers was conducted in hamadan, western iran. the purpose was to find the relationship between environmental smoking and incid...