unfortunately, the prevalence of cesarean section has increased in recent years. whereas awareness of the prevalence and causes is inevitable for planning and effective interventions, so aim of this study has designed and conducted for reviewing of systematic prevalence and caesarean causes in iran. in this meta-analysis, the required information have been collected using several keywords which...

methods this cross-sectional study was conducted on 293 nurses working in 24 wards of baqiyatallah hospital in tehran, iran, in 2016. the sampling method was stratified random sampling. data were collected using a self-administered questionnaire, which was classified into 4 subtitles: individual and organizational characteristics, perceived subjective, objective workloads, and some patient safe...

background and aims: thyroid cancer is the most common endocrine malignant and papillary cancer and three times more prevalent in women than men. the aim of this study was to evaluate the incidence rate and trend of thyroid cancer in iranian population. methods: national incidence was rated by iran national cancer registry data derived from iran’s annual national cancer registration reported fr...

Landslide is one of the common hazards occurring globally and Malaysia is not spared as well. Over the past four decades, Malaysia has played host to a number of landslide incidents, resulting in significant loss of lives and damage to property. The magnitude of landslide destruction is quite high in Malaysia. A survey has been carried out on 143 respondents in selected areas. This paper presen...

We prove three theorems giving extremal bounds on the incidence structures determined by subsets of the points and blocks of a balanced incomplete block design (BIBD). These results generalize and strengthen known bounds on the number of incidences between points and m-flats in affine geometries over finite fields. First, we show an upper bound on the number of incidences between sufficiently l...

OBJECTIVE Evaluate the role of different types of physical activity (PA) and diet on overall and central obesity incidence. METHODS A cohort study with 1621 adults was conducted in an urban Portuguese population. Anthropometrics were objectively obtained during 1999-2003 and 2005-2008. Overall, obesity was defined by a body mass index (BMI) ≥ 30.0 kg/m2 and central obesity by a waist circumfe...

The Linac Coherent Light Source is upgrading its machine to high repetition rate and to extended ranges. Novel coatings, with limited surface oxidation, which are able to work at the carbon edge, are required. In addition, high-resolution soft X-ray monochromators become necessary. One of the big challenges is to design the mirror geometry and the grating profile to have high reflectivity (or e...

Recently, significant progress in the x-ray lasers (XRL) development was made by systematically changing the incidence angle of the main pump pulse [1, 2]. This grazing incidence pumping method (GRIP) reduced the pump energy needed to values below 1J and, as a consequence, table-top XRL systems could be demonstrated with repetition rates increased by several orders of magnitude, up to 10Hz. Thi...

How much of the combinatorial structure of a pointed polyhedron is contained in its vertex-facet incidences? Not too much, in general, as we demonstrate by examples. However, one can tell from the incidence data whether the polyhedron is bounded. In the case of a polyhedron that is simple and “simplicial,” i.e., a d-dimensional polyhedron that has d facets through each vertex and d vertices on ...

We show that n arbitrary circles in the plane can be cut into O(n) arcs, for any ε > 0, such that any pair of arcs intersect at most once. This improves a recent result of Tamaki and Tokuyama [20]. We use this result to obtain improved upper bounds on the number of incidences between m points and n circles. An improved incidence bound is also obtained for graphs of polynomials of any constant m...