in this paper, the lorentzian version of beltrami-euler formula is investigated in 1n . initially,the first fundamental form and the metric coefficients of generalized timelike ruled surface are calculated and by the help of the christoffel symbols, riemann-christoffel curvatures are obtained. thus, the curvatures of spacelike and timelike tangential sections of generalized timelike ruled surf...

conclusions the present study reports the characteristics of iranian hookah smokers. most hookah smokers were educated young adults, who often smoked at home or in teahouses and in the company of friends. the majority of the participants smoked fruit-flavored tobacco and had no desire or intention to quit smoking. further studies in this field are required and hookah smoking should also be inco...

introduction: intentional and unintentional poisoning are among the most common reasons for referrals to emergency department (ed). therefore, the present study was designed to evaluate epidemiologic features and effective risk factors of intentional and unintentional poisoning in children. methods: this prospective cross-sectional study was carried out in ed of loghman hakim hospital, greatest...

carpal tunnel syndrome (cts) is the most common entrapment neuropathy. it accounts 90% of all entrapment neuropathies all over the world. ultrasound is a non-invasive, cost effective and available para-clinical method which could be applied for cts diagnosis. cross-sectional area of the median nerve at the level of the inlet is considered as a diagnostic criterion in cts cases. in this study, t...

aims: considering the medical significance of cockroaches as insect vectors of food toxicities, and triggering allergy in respiratory system and skin, this survey was conducted to study the frequency of infestation and their effective factors in shahin shahr, iran. materials & methods: this cross-sectional descriptive study was carried out in 2010 in shahin shahr, isfahan, iran. data gathering ...

on the basis of a cross-sectional demographic survey that was conducted among the qashqai tribe of southern iran in 1973, the crude birth rate was estimated at 48.2 per thousand per year. the most productive age groups, was 25-29 years. forty-nine, point seven per cent (49.7%) or about one half of the total births occurred among married women aged 20 to 29 years eighty-seven point three per cen...

background: although there are efforts being underway to control and prevent intestinal parasitic infections (ipis) in ethiopia, they are still endemic and responsible for significant morbidity. the aim of this study was to evaluate the prevalence of ipis and their association with nutritional status among primary school children of delo-mena district, south eastern ethiopia. methods: a cross-s...