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Let H denote the set {f1, f2, ..., fn}, 2 the collection of all subsets of H and F ⊆ 2 be a family. The maximum of |F| is studied if any k subsets have a non-empty intersection and the intersection of any l distinct subsets (1 ≤ k < l) is empty. This problem is reduced to a covering problem. If we have the conditions that any two subsets have a non-empty intersection and the intersection of any...

Background: Pregnancy in opioid-dependent women is a major public health issue. According to a national household survey in 2001, 3.7% of pregnant women in the United States used illicit drugs. In 2009 this number increased to 4.5% . Women who are afflicted by opioid addiction form a highly vulnerable group of patients frequently facing unplanned pregnancy with adverse outcomes including perina...

nasogastric tube (ng) insertion is a usual technique in any neonatal intensive care unit. this procedure is undertaken for the children who are in need of invasive care. sometimes, the insertion of nasogastric tube in infants with esophagus friable anatomy tissues may have some dangerous side effect, but such problems are not very common. esophageal perforation is a rare but known complication ...

Introduction: High-risk pregnancies can result in many complications for the fetus. In these pregnancies, different tests such as non-stress test (NST), biophysical profile (BPP), oxytocin contraction stress test (OCT), and Doppler sonography can be used to evaluate fetal health. As standard BBP requires more time and expertise, in this study, we evaluated the relationship between standard BPP,...

abstract background: a newborn is highly fragile whose death can be caused by embryonic, intra partum, and postpartum factors. identifying the causes of death is the first step to be taken in order to decrease the death rate. the present study was aimed at finding out how neonatal factors and therapeutic actions affect death of newborn babies. materials and methods: this is a case-control study...

We use reformulation techniques to model and solve a complex sphere covering problem occurring in the configuration of a gamma ray machine radiotherapy equipment unit.