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RISS 인기검색어
- 검색키워드
- 저자 : Farhad Salimi (검색결과 3 건)
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Farhad Salimi,Mohsen Vafaie Sefti,Khosrow Jarrahian,Majid Rafipoor,Seyyed Saeed Ghorashi 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.6
The effects of clay (montmorillonite and kaolinite) in the hydrogels were investigated on various propertiessuch as syneresis and strength of thermal and salinity situations in one of the southern Iranian oil reservoirs. The X-raydiffraction (XRD) patterns exhibited a significant increase in interplanar spacing between the montmorillonite claylayers, varying from the initial value of 12.43 oA to 19.45 oA, which evidences the intercalation formation. It was revealedthat even increasing of the interlayer spacing due to kaolinite modification had no effect on the clay compositions. Formationwater was used to study the strength of the hydrogel in the presence of ions. The results indicated that 15 wt%increase of kaolinite clay (modified and non-modified) leads to 20% decrease of the hydrogels’ syneresis. The diffusionof polymer chains between the clay layers increased the elastic modulus (G') of the prepared hydrogels with modifiedkaolinite and montmorillonite, where the maximum value of G' was observed in 3 wt% of montmorillonite. Finally,the thermogravimetric analysis (TGA) indicated an increase in the thermal stability of the mentioned hydrogels.
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Reduction in labor pain by intrathecal midazolam as an adjunct to sufentanil
Alireza Salimi,Reza Amin Nejad,Farhad Safari,Seyed Amir Mohajaerani,Rahim Jahanbakhsh Naghade,Kamran Mottaghi 대한마취통증의학회 2014 Korean Journal of Anesthesiology Vol.66 No.3
Background: Anesthesia today has strived to decrease labor pain in a tolerable and controllable fashion. Intrathecal midazolam has been introduced as an adjunct to analgesics. The study was planned to assess the efficacy, safety and duration of analgesia produced by intrathecal midazolam adjunct to sufentanil in decreasing labor pain. Methods: In a randomized clinical trial 80 parturient included in the study. The two groups were matched for age, cervical dilation, gravid, gestational age, and other demographic characteristics. Combination of sufentanil and midazolam administered intrathecally to experimental group and compared to sufentanil group. Time to reach maximum block, and pain score was measured and recorded. Results: Groups were matched for age and weight and other demographic characteristic. No significant adverse effect was seen in both groups including decrease in Apgar score. Duration of analgesia was 92.0 ± 12.7 in sufentanil group and 185.2 ± 15.2 minutes in midazolam and sufentanil group which was significantly different (P = 0.002). Numeric rating scale score was significantly lower in midazolam group compare to sufentanil group at 120 min (P = 0.01), 150 min (P = 0.0014), and 180 min (P = 0.001). Conclusions: Intrathecal midazolam as an adjunct to opioid could significantly enhance analgesia in labor pain with no significant adverse effect. Intrathecal injection of midazolam is an appropriate alternative to parenteral or epidural analgesia in small hospital settings.
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Mozhdeh Amiri,Ehsan Jafarbeigi,Salimi Farhad 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.3
The aim of this study was to remove Azo dye, Direct Red 16, from a synthetic solution, 50 mg/l, and also to treat the wastewater of the licorice extract plant, LEP, by nanofiltration membrane with high anti-fouling properties. In this regard, a new polymer nanocomposite was fabricated by mixing cellulose nanocrystals functionalized with amino acid cysteine (CNF-AAC) and investigating the effective parameters such as anti-fouling properties, as well as the performance of the modified membrane in removing the dye. In this regard, field emission scanning electron microscopy (FESEM), scanning-force microscopy (SFM), atomic force microscopy (AFM) and contact angle measurements were performed. The results of AFM analysis indicated that the surface roughness of polyether sulfone-membrane is reduced by the addition of CNF-AAC. Therefore, by increasing the concentration of nanocrystals from 0 to 1 wt% in the initial solution of the membrane, the net distilled water flux permeation has increased from 18.05 (kg/m2h) to 26.50 (kg/m2h). Also, with increasing the concentration of CNF-AAC in the initial solution of the membranes, the size of the contact angle has gradually decreased. Meanwhile, adding a small amount of CNF-AAC (0.5 wt%) to the polyether-sulfone membrane has led to reducing the rate of irreversible fouling from 43.34% to 4.89% and in contrast, to increasing the amount of reversible fouling from 30.02% to 63.54%. On the other hand, in this study, the yield of dye solution by the optimal membrane is 98.38%, for which the percentage of COD removal for the wastewater of LEP has reached 90%.
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