background: the induction of cancer appears to be the most important effect of low-dose ionizing radiation to occur in an exposed population. in developing countries 94% of human radiation is from natural sources. in iran some high altitude regions such as, chaharmahal & bakhtiari has high levels of the natural background radiation (higher than the worldwide average). therefore, investigation o...

the purpose of this study was to investigate the incidence of different types of skin diseases among 657 children who were seen during one year period (oct. 1971-setp. 1972) at the skin clinics of the isfahan university hospital. the incidence of different types of skin disease was compared with those of the adults. in general this study shows that in isfahan area the incidence of skin infectio...

objective neonates, for many reasons, are at particular risk for the development of seizures, which are a strong predictor of later morbidity and mortality in infants. we undertook this study to determine the incidence, etiologic distribution and neonatal seizure type in neonates with hospital admission over a period of 4 years. materials and methods this, a retrospective study of newborns admi...

OBJECTIVE To identify specific alcohol-related predictors of postoperative delirium. DESIGN Inception cohort, logistic regression with step-wise selection. SETTING Ohio State University Comprehensive Cancer Center, Columbus. PATIENTS A total of 774 patients undergoing major resection of head and neck squamous cell carcinoma. MAIN OUTCOME MEASURES The correlation of 19 variables with pos...

in the open-pit mining, one of the first decisions that must be made in production planning stage, after completing the design of final pit limits, is determining of the processing plant cut-off grade. since this grade has an essential effect on operations, choosing the optimum cut-off grade is of considerable importance. different goals may be used for determining optimum cut-off grade. one of...

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...

In the second sentence of page 259, which says ‘However, this will “underestimate” the cosmic-ray flux entering the atmosphere.’ the word ‘underestimate’ should be ‘overestimate’. Also, in the next to last sentence on page 260, which says ‘The use of the vertical cut-off alone over the entire 2-solid angle of incidence of the primary cosmic radiation will “underestimate” the incident cosmic-ray...

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...

We developed methods to assess the cancer risks by screening tests. These methods estimate the size of the high risk group adjusted for the characteristics of screening tests and estimate the incidence rates of cancer among the high risk group adjusted for the characteristics of the tests. A method was also developed for selecting the cut-off point of a screening test. Finally, the methods were...

OBJECTIVES Evaluation of the surgical management, outcome and complications in patients with pertrochanteric fractures treated with PFNA nail. MATERIAL AND METHOD A retrospective study was conducted on 200 patients treated consecutively between April 2010 and February 2012. Radiological assessments were performed before and after the surgery, and during the follow-up (fracture reduction, blad...