background: surgical site infection is known as a common complication after cardiac surgery, and cefazolin is the best prophylactic antibiotic to prevent this complication. the goal of this study was to evaluate the effect of continuous and intermittent cefazolin for the prevention of superficial surgical site infection following off-pump coronary artery bypass (opcab). methods: this prospectiv...

background: adjuvants such as ketamine, promethazine and paracetamol could bring up patients satisfaction and control harmful effects of opioids besides lessening their needed doses, as seen by fentanyl/paracetamol and fentanyl/ketamine combination before. the current study headed to compare paracetamol and ketamine in addition to fentanyl applied by infusion pumps in order to pain relief follo...

the goal of this research is the derivation of method for evaluation of efficiency improvement potential for district heating systems with focus on variable speed centrifugal pump. the effectiveness of the usage of the proportional pressure control is compared with the constant pressure control. this is why, energy calculation analyses have been realized for variable speed centrifugal pumps, an...

the present study was conducted to find the effect of three heavy metals, ag, hg and pb on the expression level of a gene encoding plasma membrane h+-atpase in aeluropus littoralis. the experiment was laid out in a completely random design with three replications. the expression of the main gene was normalized to the expression of the housekeeping gene actin. two 259 and 187 bp fragments were a...

Abstract: In this paper, an exergy analysis approach is proposed for optimal design of distillation column by using simulated annealing algorithm. First, the simulation of a distillation column was performed by using the shortcut results and irreversibility in each tray was obtained. The area beneath the exergy loss profile was used as Irreversibility Index in the whole column. Then, First Opti...

This paper investigates 3D simulation of fluid flow in a centrifugal pump from the Detroit Diesel company to extract possible engine cooling trends.  The velocity and pressure profile of water, the coolant, is analyzed and the characteristic curves of the pump are derived. This provides a useful evaluation of the pump performance at all working conditions. For this aim, a computational fluid dy...

conclusions given the significant prevalence of postoperative cognitive disorder and significant associatio n between the history of high blood pressure, c-reactive protein and preoperative creatinine and cognitive disorder, detection of patient’s clinical symptoms may improve diagnosis, treatment and prevention of this disorder. patients and methods in total, 171 patients who had undergone off...

the review of literature shows that a strong relationship exists between the symptoms of otolaryngologic diseases and gastroesophageal reflux disease (gerd). it is commonly observed that an extended physical examination is needed to determine the occurrence of gerd. this non-randomized,prospective quasi-experimental study was performed to clinically verify the relationship between otolaryngolog...