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Articles by M. Ansari
Total Records ( 6 ) for M. Ansari
  A. Rezaee , M. Ansari , A. Khavanin , A. Sabzali and M.M. Aryan
  The design and operation of wastewater treatment systems for hospital is a challenge for wastewater engineers. In this study, a pilot-scale system integrated anaerobic-aerobic fixed film reactor for hospital wastewater treatment was constructed and its performance was evaluated. The aim of the study was the elimination of organic compounds and a significant reduction of bacteria. The system had been operated for 90 days. The results show that the system efficiently removed 95.1% of the chemical oxygen demand (COD) from a hospital wastewater with the influent COD of 700 mg L¯1, leaving 34 mg L¯1 COD in the effluent. The significant removal of pathogenic bacterial has been do after operating of the system. The advantages of the treatment system studied for small wastewater flows include: (I) simple operation and maintenance; (II) efficient removal of COD and bacteria; and (III) low-energy consumption.
  A. Rezaee , A. Khavanin and M. Ansari
  Work camps, have to be established quickly, are a transient nature and located in environmentally sensitive areas. Wastewater treatment systems located in the work camps often perform poorly. In response to these deficiencies and the need to provide for reliable, cost effective, high efficiency wastewater treatment, the research team designed a sequence batch reactor (SBR)/ sand filter system that is simple, compact, robust, easy to operate and produces a high quality effluent. The SBR/sand filter system is operated with varying organic loading rates and process performance is assessed by monitoring COD, BOD5, pH, volatile suspended solids, suspended solids and nitrate during the cycle operation. The process described, is a flexible, biologic, suspended growth system that can be operated in the conventional activated sludge or extended aeration mode.
  M. Ansari and G.H. Davarynejad
  The effects of pollens introduced from 6 sweet and sour cherry cultivars (Siah mashhad sweet cherry, shishei sweet cherry, local sour cherry and Érdi bötermö, Érdi jubileum and Cigány meggy sour cherry) were studied on fruit properties of three Hungarian sour cherry cultivars (Érdi bötermö, Érdi jubileum and Cigány meggy ) grown under Mashhad, Iran climatic conditions. The results showed relative variation in Hungarian sour cherry fruits as affected by pollen sources. Pollens of Siah mashhad as paternal choice had better effects were gave high quality of maternal tree fruits compared to control and other pollen donors. Pollens of Siah mashhad caused the increase of fruit size in Cigány meggy cultivar, as well as reduction in total soluble solids of Érdi bötermö fruits, however, it does not have significant effect on the qualitative traits of Érdi jubileum fruits.
  M. Ansari and G.H. Davarynejad
  Cross-pollination, Natural and artificial self-pollination were performed in addition to open pollination in three Hungarian sour cherry cultivars (Erdi botermo, Erdi jubileum and Cigany meggy), planted under Mashhad, Iran climatic conditions. An experiment conducted using factorial based on randomized completely block design during 2005 and 2006, with 6 replications in 2005 and 4 replications in 2006. Flowers before anthesis and in balloon stages were isolated with paper bags from guest pollens and pollinated in appropriate time. Arc-sinus transformation was carried out on the data of final fruit set percentages obtained from cross pollination, open pollination, natural and artificial self pollination. The averages of final fruit set showed the advantage of open pollination (14.6%) in compare with natural self pollination (4.4%) and artificial self pollination (13.0%). Siah mashhad sweet cherry cultivar with more than 70% overlap of flowering and 9.8% fruit set in 2005 and 17.9% in 2006 was the best among applied pollen donors for Erdi botermo sour cherry cultivar. Also, Siah mashhad with more than 50% overlap of flowering time and 25.8% fruit set was the best polliniser for Cigany meggy sour cherry. Among the pollinisers, Siah mashhad was the best for Erdi jubileum with more than 50% overlap and 15.2% fruit set.
  M.T. Mortazavi , M. Niazi-Ghazani and M. Ansari
  This study was performed to compare the transarterial (T) and paraarterial (P) approaches for brachial plexus block, in terms of success rate, onset time and duration of analgesia and complications. Hundred patients scheduled for elbow, arm or hand surgery at Tabriz Shohada hospital from October 2005 to December 2006, randomly allocated into two groups (n = 50 per group), based on the approach chosen to block the brachial plexus. For local anesthesia each patient received 22.5 mL of 2% lidocaine with 17.5 mL distilled water (in total volume of 40 mL and total dose of 450 mg) and 1/200000 epinephrine with a standard 23 gauge needle. All patients were sedated with 1 μg kg-1 of fentanyl and 0.02-0.05 mg kg-1 of midazolam. There was no statistical difference between the groups in duration of analgesia but the onset of anesthesia was significantly quicker in paraarterial technique (3.5 vs. 13.4 min, p<0.001). Success rate was 86% in group T and 98% in group P (p = 0.03). Two percent of patients in group P and 6% in group T had total failure of the block and 8% of the group T required supplementary drug. Paraarterial method for axillary block is preferable due to quicker onset of blockade and higher success rate.
  A. Rezaee , S. Ahmadizad , A. Khavanin , M. Ansari and M. Farokhi
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