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Articles by S. Jafari
Total Records ( 7 ) for S. Jafari
  A. Koochekzadeh , G. Fathi , M.H. Gharineh , S.A. Siadat , S. Jafari and Kh. Alami-Saeid
  Effect of nitrogen (N) rate and its split application (AP) on qualitative and quantitative characteristics of sugarcane (Saccharum officinarum L.) cultivar CP48-103 was investigated on a loamy soil texture from 2006 to 2008 in the Sugarcane Research Center of the Khuzestan Province, Iran. The experiment was arranged in split plot randomized complete block design with three replications consisted of three different rates of N (N1 = 92, N2 = 138, N3 = 184 kg N ha-1) as main plots and three different AP (AP1 = 20-40-40%, AP2 = 30-35-35%, AP3 = 30-30-40%) as subplots. Twenty canes were randomly harvested from each plot and their quantitative and qualitative characteristics were determined. The results showed that both rate and split application of N fertilizer had no significant effect on sugarcane characteristics. The interactive effects of N application rate and AP on juice purity depicted applying 92 kg N ha-1 and AP of 30-30-40% gave the purest juice with 90%. The Nitrogen Use Efficiency (NUE) was significantly greater for N1 with values of 1.39 and 0.13 t kg-1 N in Cane Yield (CY) and Sugar Yield (SY), respectively. The results showed that the highest cane and sugar yield was obtained with 92 kg N ha-1 and AP of 30-35-35%.
  S. Jafari , S. Esfahani , M.R. Fazeli , H. Jamalifar , M. Samadi , N. Samadi , A. Najarian Toosi , M.R. Shams Ardekani and M. Khanavi
  The volatile oil from Citrus aurantifolia (Christim) Swingle (lime) fruit peel is abundantly used as flavoring agent in food industries. In this study chemical composition and antimicrobial activity of essential oil Citrus aurantifolia against food-borne pathogens was determined to investigate its potential in reducing microbial population of cream-filled baked goods. Fifty componenets were identified in Citrus aurantifolia essential oil by GC-MS analysis and limonene, α-terpineol and γ-terpinen were the most abundant constituents. The results of bioburden determination showed that cream-filled cakes and pastries were mainly contaminated with Staphylococcus epidermidis and Bacillus subtilis. Lime essential oil showed potent antibacterial activity against spoilage bacteria. MICs (Minimum Inhibitory Concentration) of lime essential oil against S. epidermidis and B. subtilis were determined 4 and 8 μL disc-1, respectively. By using 16 and 32 μL mL-1 of essential oil, more than 99.9% reduction in S. epidermidis and B. subtilis counts were observed, respectively. The use of Citrus aurantifolia essential oil in concentrations higher than MIC value can improve shelf life of cream-filled cakes and pastries. According to our results, lime oil can increase the time needed for the spoilage bacteria to reach concentrations able to produce a perceivable spoilage and it may consequently reduce the risk of diseases associated with consumption of contaminated products.
  H. Asilian Mahabady , S. Jafari , H. Kazemian and A. Khavanin
  Gold nanoparticle is the active catalyst for CO oxidation at low temperature. This feature of gold base catalysts is suitable to overcome the problem of cold-start problem of automobile exhaust TWC converters. In this study gold nanoparticle were deposited on modified NH4-Y type zeolite. The activity of synthesized catalyst was measured in a fixed-bed quartz-tubular reactor (7mm i.d.) under atmospheric pressure. In order to investigate the catalytic activities toward CO oxidation reaction, 31mL/min of air and 0.155mL/min of carbon monoxide were mixed and then passed through the reactor. It was found that activity of Au/Y catalyst was 100% at 20°C. The thermal stability of Au/Y catalyst was measured at 400°C for 4h. The activity of the catalyst was decreased to 65% at 20°C after thermal stability test. Results of Energy Dispersive Analysis by X-rays before and after thermal stability have showed that Au content of these samples were 3.89% and 1.76, respectively. It was found that the amount of Au content decreased after thermal stability process. Fourier Transform Infrared (FT-IR) spectra showed no changes in framework structure of zeolite during thermal stabilization process of the catalyst.
  M. Albaji , S. Boroomand Nasab , H.A. Kashkuli , A.A. Naseri , G. Sayyad and S. Jafari
  The main objective of this research is to compare two different irrigation methods according to parametric evaluation system in an area of 15831 ha in the North Molasani region`s soil located in Khuzestan province, Southwest Iran. Soil properties of the study area including texture, depth, electrical conductivity, drainage, carbonate content and slope were derived from a semi-detailed soil study regarding North Molasani plain in a scale of 1/20000. After analyzing and evaluating soil properties, suitability maps were generated for both methods by means of Remote Sensing (RS) and Geographic Information System (GIS). The results showed that 163 ha of the studied area were highly suitable for Surface Irrigation methods. Whereas 2288 ha of the study area was highly suitable for drip irrigation methods. Also, it was found that some series coded 2, 3 and 5 covering an area of 7582 ha, were not suitable to be used for surface irrigation systems and two series coded 3 and 5 with an area of 1381 ha were classified not suitable for drip irrigation systems. Moreover, the results indicate that by applying drip irrigation instead of surface irrigation methods, suitability classes of 8732 ha (55.16%) of North Molasani plain`s land will improved. Ultimately, drip irrigation system was suggested as the best method to be applied to the said study area. The main limiting factors in using both surface and drip irrigation methods in this area were soil carbonate and drainage.
  S. Jafari , H.R. Abdolmohammadi , H. Eliasi , M.B. Menhaj and M.R. Rajati
  The aim of this study is to provide an experiment design method for modeling and function approximation. Modeling real-life systems is extremely of interest nowadays. Models could be useful in analysis of systems and help us understand their behavior. From a new point, models could be classified into three classes: black box models, gray box models and white box models. Our idea is related to black box modeling. Proper performance of a black box model depends on structure of the model as well as the data used to determine its parameters. Although one of the important factors affecting the richness of the dataset is the number of data, increasing the number of data points is limited in real problems. For instance gathering data from many systems imposes spending lots of time and cost. In this study, inspired by honey bee algorithm, we have designed a method which enriches the datasets for a known number of data, in comparison to other conventional data extraction methods. In such a method, after extracting some data by grid method, the other data points are extracted according to an intelligent analysis on available data. The results illustrate the efficiency of the proposed method.
  A.A. Naseri , S. Jafari and M. Alimohammadi
  The main purpose of this study was to shed light on the soil behaviour from compaction point of view before and after harvesting traffic and on the reaction to the subsoiling operation. In this regard two different experiments were conducted and to provide an alternative tool for this evaluation, High Resolution Computed Tomography (HRCT-Scan) was also used. The results showed positive correlation of clay with maximum dry bulk density, but it was found that sand and silt were more positively correlated with optimum moisture content than clay. These results indicated that in this region, the soils are most susceptible to compaction and harvesting traffic make them compacted. The maximum compaction occurred in the first layer (0-20 cm depth) and minimum or no compaction happened in the layer, beyond the 60 cm depth. These results also showed that subsoiling the soil can improve the soil physical properties. Furthermore, CT-Scan results indicated that compaction can be treated by subsoiling and soil physical properties can be improved. This type of managing soil compaction has been used in the field and high harvested sugarcane (Saccharum officinarum) yield indicates that it is a successful operation.
  M. Hasibi , A. Amirzargar , S. Jafari , A. Soudbakhsh , M. Hajiabdolbaghi , A. Rashidi and M. Gharouni
  The aim of study was to determine the diagnostic value of Polymerase Chain Reaction (PCR) and Enzyme Linked Immunosorbent Assay (ELISA) in 37 confirmed cases of brucellosis and 78 healthy controls. The diagnosis of brucellosis was based on a compatible clinical picture plus a positive blood culture and/or an antibody titer of≥1:160 at the serum agglutination test. Controls were asymptomatic individuals with negative blood cultures and no previous history of brucellosis. PCR and ELISA were performed on all samples. PCR was positive in 15 (40.5%) patients and no controls. Mean±SD (range) ELISA IgG levels in patients and controls were 198.9 ± 63.1 (9.7-231.9) IU mL-1 and 14.6±27.2 (0-145.0) IU mL-1, respectively (p<0.001). The area under the receiver operating characteristic curve for distinguishing between cases and controls was 0.977. The cutoff point for ELISA results yielding maximal sensitivity plus specificity was 167.35 IU mL-1. ELISA proved to be a more appropriate diagnostic method than PCR in the series, with sensitivity, specificity, positive predictive value and negative predictive value of 89.2, 100, 100 and 95.1%, respectively.
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