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Articles by Seyed Ali Sajjadi
Total Records ( 3 ) for Seyed Ali Sajjadi
  Seyed Ali Sajjadi , Homa Shakeri , Mohammad Hassan Minooeyian Haghighi and Alireza Mohammadzadeh
  Majority of people spends 90% of their time in indoor; therefore, quality of indoor air is of great importance from health viewpoint. Because of exposure to bioaerosols in indoor and the proven relationship between them and a wide range of undesirable health effects, the present study is aimed to surveying microbial indoor air quality in some of public places of Gonabad City, Iran. The study was carried out in spring 2015 and bacterial and fungal bioaerosols were measured. The bioaerosol samples from each location (municipality building, students’ dormitory, public library and hospital) were collected in morning and afternoon from randomly selected spots. Results of measurements of each sampling occasion were reported as mean values. Samplings were done using active Zefon A6 Inpacter sampler at 1.5 height from the floor (normal respiratory height). Totally, 192 samples (96 bacterial and 96 fungi with replication) were collected. Afterward, the bacteria and the fungi were determined based on microbiology tests. Effects of the environmental factors (temperature and relative humidity) on concentration of bioaerosols were also taken into account. concentration of the bacteria and fungi varied in the range 13-813 CFU/m3 and 0-288 CFU/m3 respectively. Air quality in waiting hall of the hospital was the lowest quality with mean bacterial and fungal concentrations of 296.1 and 105.4 CFU m-3, respectively. In addition, air quality in the public library and municipality building was the highest quality with mean concentration of bacteria and fungi 60.6 and 37.8 CFU m-3, respectively. Data analyses showed that there was a direct significant relationship between concentration of bacteria and air temperature (p<0.01). In addition, there was a significant relationship between concentration of bacteria and fungi (p<0.01). The findings also highlighted a significant relationship between concentration of fungi and relative moisture of the air (p<0.05). Taking into account the significant relationship between concentration of bioaerosols and background factors such as temperature and humidity using effective air conditioning system to control temperature and humidity of the air, detecting potential contamination focus points and temporary factors effective on bioaerosols in indoor appears to be effective on improving quality of indoor air. These measures, in turn, result in decrease in concentration of bioaerosols and pathological bioaerosols in particular.
  Seyed Ali Sajjadi , Ghorban Asgari , Hamed Biglari and Afsane Chavoshani
  Pentachlorophenol (PCP) is one of the most pollutants frequently used in fungicides and pesticides. Its toxicity is due to intervention with oxidative phosphorylation. Acute and chronic PCP poisoning are approved in human and other living organisms. Recently, AOPs based on microwave and sulfate radical (SO4-) have created many great scientific interests due to its high efficiency in the degradation and mineralization of recalcitrant and/or toxic organic pollutants. So that in this study for removal of pentachlorophenol removal by persulfate and microwave processes coupled (MW/SPS) from aqueous environments was used. The effects of operational parameters such as pH of solution, the power of microwave radiations and the amount of persulfate concentration were studied. Spectrophotometer and HPLC instruments were used for determining the concentration of PCP. The experimental results showed that the removal of PCP was influenced by many factors, such as the pH value, the amount of persulfate and microwave power. The optimum conditions for the best removal rate were obtained at pH 11, a persulfate concentration of 0.02 mol L–1 and microwave irradiation power of 600 W for MW/SPS system at constant PCP concentration. Also, obtained results showed that the removal of PCP by MW/SPS and MW alone were follow first order rate decay kinetics and the rate constants were 0.093 and 0.00066 min–1, respectively. The results showed that used the combination of microwave/persulfate processes is applicable for the removal of pentachlorophenol from aqueous solutions.
  Seyed Ali Sajjadi , Mojtaba Kianmehr , Samira Salari and Hamed Biglari
  Recently, negative effects of UV and gamma radiation are one of the human concerns in each reign. Therefore, detection of UV and gamma threshold in different geographical areas, for possible radiation crises management in risk full reigns is necessary. Therefore, natural and manmade features effects on UV and gamma radiation was studied in Gonabad. In this sectional study, the effect of natural (latitude, longitude, height and climate conditions) and manmade (village, urban, road and others) features on UV and gamma radiations in Gonabad located in Khorasan Razavi, Iran were measured using an emanation method. Distance between each two stations was 5 Km. Results showed that the relationship between UV and gamma radiation with longitude was significantly negative. Also, the relationship between UV and gamma radiations with latitude was significantly negative (p<0.001) and no significant respectively (p>0.001). But climate condition (cloudy, semi cloudy and lightly) had significant (p<0.001) and no significant effect (p>0.001) on UV and gamma radiation, respectively. In addition, effects of natural and manmade features on UV and gamma radiations was significant (p<0.001) and no significant (p>0.001), respectively. At the end it was cleared that changes range of UV and gamma radiations was 0.464±0.2798 W/m2 and 0.1321±0.01936 msv. The results shown that the average of UV and gamma radiation in Gonabad are more than international mean value reported by UNSCEAR-2000.
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