the aitamir formation (albian- cenomanian) in the kopet- dagh basin consists of fine to medium grained sandstone, siltstone, shale and limestone. its lower contact with the sanganeh formation is gradual and its upper contact with the abderaz formation is unconformable. field and petrographic studies of the aitamir formation in artenj and ghorghoreh sections, located in bazangan area- east of ko...

impact is one of the most important subjects which always have been considered in mechanical science. nature of impact is such that which makes its control a hard task. therefore it is required to adopt a safe and secure mechanism for transferring the impact to other vulnerable parts of a structure, when it is necessary. one of the best methods of absorbing impact energy is using thin-walled tu...

Title: Racial and ethnic differences in primary, unscheduled cesarean deliveries among low-risk primiparous women at an academic medical center: a retrospective cohort study

The study of jets gives insight into Quantum Chromodynamics and serves as a tool to search for physics not described by the Standard Model. Measurements of high energy jet cross sections probe the structure of protons and look for signatures of parton structure. Recent results on jet structure and jet cross sections from the Tevatron and HERA are discussed in this talk. Measurements of subjet s...

Most industrialized countries have reported recent decreases in the size of infants born at term but no reduction, or even a rise in the incidence of preterm birth. This paper reviews recent secular trends in preterm birth and the evidence about possible reasons for those trends. The hypothesized reasons include ignorance about the causal determinants of preterm birth, failure to reduce exposur...