the propose of this paper is to introduce a new model for crude oil fouling in preheat trains of crude distillation unit. the experimental results of australian light crude oil with the tube side surface temperatures between 200-260 oc and fluid velocity ranged 0.25 to 0.4m/s were used. the activation energy of chemical reaction depends on the surface temperature has been calculated.  the model...

conclusions flushing dental unit waterlines are an effective measure in reducing the number of bacterial contaminants. results bacterial contamination was found in all 24 units at the beginning of daily activity with a mean colony count of 17850. the number of colonies decreased to 3250 following 30 seconds of flushing in 16 units and later to 1837 after flushing for two minutes in 13 units. in...

this paper proposes a novel technique for solving generation scheduling and ramp rate constrained unit commitment. a modified objective function associated with a new start-up cost term is introduced in this paper. the proposed method is used to solve generating scheduling problem satisfying srr, minimum up and down time as well as ramp rate constraints. two case studies are conducted to implem...

the effect of drought indices on hydrostatic variations and qualitative parameters of the zahedan plain's aquifer was investigated. for this purpose, 12-year statistics from observational and piezometry wells in the plain, the drought index of percentage normal )pn), standardized precipitation index )spi(, and 30-year precipitation statistics of zahedan station were used. results revealed ...

the empiric antibiotic therapy can result in antibiotic overuse, development of bacterial resistance and increasing costs in critically ill patients. the aim of the present study was to evaluate the effect of procalcitonin (pct) guide treatment on antibiotic use and clinical outcomes of patients admitted to intensive care unit (icu) with systemic inflammatory response syndrome (sirs).  a total ...

receiving information related to patients hospitalized in the intensive care unit is among the most important needs of the family members of such patients. when health care professionals should decide whether to be honest or to give hope, giving information becomes an ethical challenge we conducted a research to study the ethical approaches of iranian nurses to giving information to the family ...

background & aim: high levels of anxiety in mothers after the birth of a premature infant and its negative effects and consequences on the infant and the family indicate the necessity of performing an intervention for them. this study was conducted to evaluate the effect of neonatal intensive care unit orientation program on the anxiety of premature infants’ mothers in shahrekord . methods & ma...

conclusion the calculated ni rate in our study (14.7%) is higher than usual rates reported from picu in other societies. meanwhile, long stay in picu and age less than 2 years are the main risk factor for ni and subjects with ni are 5.13 times more likely to die. patients and methods this cross sectional study was carried out on all patients hospitalized for more than 48 hours in pediatric inte...

background: this study aimed to determine the impact of an empowerment program on maternal stress. materials and methods: during may 2009–may 2010, this quasi‑experimental study was performed in the neonatal intensive care unit (nicu) of shahid akbarabadi, rasoul‑e‑akram, and aliasghar hospitals affiliated to tehran university of medical sciences (iran). the program consists of an educational c...

abstract background: preterm infants constitute a large proportion of the newborn population in the neonatal intensive care units (nicus). parents, as the main members of the care team, are not adequately supported as the focus is chiefly on infant care. the present study aimed to evaluate the effect of a family support intervention on the stress levels among the parents of preterm infants in n...