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RISS 인기검색어
- 검색키워드
- 저자 : Hassan Jalal (검색결과 4 건)
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Forming limit diagram of aluminum AA6063 tubes at high temperatures by bulge tests
Seyed Jalal Hashemi,Hassan Moslemi Naeini,Gholamhossein Liaghat,Rooholla Azizi Tafti,Farzad Rahmani 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.11
A free bulge test and ductile fracture criteria were used to obtain the forming limit diagrams (FLD) of aluminum alloy AA6063 tubesat high temperatures. Ductile fracture criteria were calibrated using the results of uniaxial tension tests at various elevated temperaturesand different strain rates through adjusting the Zener-Holloman parameter. High temperature free bulge test of tubes was simulated infinite element software Abaqus, and tube bursting was predicted using ductile fracture criteria under different loading paths. FLDs whichwere obtained from finite element simulation were compared to experimental results to select the most accurate criterion for prediction offorming limit diagram. According to the results, all studied ductile fracture criteria predict similarly when forming condition is close tothe uniaxial tension, while Ayada criterion predicts the FLD at 473 K and 573 K very well.
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Naeemeh Zari,Jalal Hassan,Kourosh Tabar-Heydar,Seyyed Hamid Ahmadi 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.86 No.-
An extraction method employing dispersive liquid–liquid microextraction (DLLME) and ICP-OES hasbeen developed for rapid separation, pre-concentration and determination of ultra-trace amount of Au(III). The extraction of the analyte was performed in the presence of a quaternary ammonium cation, NMethyl-N, N, N-trioctylammonium chloride, (Aliquat 336) as an extractant based on ion-associationextraction system.1-octanol and acetonitrile were used as extraction and disperser solvents, respectively. The variables affecting the extraction conditions were optimized. Calibration curve in the range of 0.3–100 ng mL 1, the detection limit of 0.09 ng mL 1, enrichment factor of 150 and extraction recovery of 74%were obtained. The precision (R.S.D. %) of the method was 6% for 5 replicates and recoveries of 10 ng mL 1Au(III). The combined DLLME method with ICP-OES can readily determine Au(III) at trace (mg L 1) levelusing only 10 mL of sample solution (tap, lake, and mining water) and ore sample without interference bythe matrices. This methodology is simple, fast, and low cost which can be used in routine analyticallaboratories.
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Metal Concentrations in the Coastal Fauna of the Caspian Sea
Mirzajani Alireza,Hamidian Amir Hossein,Hassan Jalal 한국해양과학기술원 2021 Ocean science journal Vol.56 No.3
Metal concentrations were measured in predominant coastal fauna of the Caspian Sea including six macro-invertebrates (Mnemiposis leidyi, Balanus improvisus, Pontogammarus maeoticus, Palaemon adspersus, Cerastoderma glucaum and Adacna vitrea) and three species of small fish (Atherina caspia, Neogobius caspius and N. pallasi) to determine potential bio-indicators (for the first time to our knowledge). It is to be noted that metal concentrations have also never been reported in M. leidyi and A. vitrea. The lowest levels of metal were observed in muscles of fishes. Most of metals were detectable in the macro-plankton M. leidyi suggesting that this species could be used for water pollution monitoring, worldwide. Our results suggest the use of C. glucaum and A. vitrea as indicators of Ni and Cd contamination, respectively. B. improvisus has a high potential as an indicator for Zn and Cu pollution, while P. adspersus and P. maeoticus showed this capacity for Cu. This study provides a baseline for biomonitoring programs elsewhere in the Caspian Sea. Furthermore, the species C. glucaum and B. improvisus could be used for comparisons of metal contamination worldwide.
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Iqbal M. Ismail,Ahmad S. Summan,Jalal M. Basahi,Essam Hammam,Mohamed F. Yassin,Ibrahim A. Hassan 한국대기환경학회 2021 Asian Journal of Atmospheric Environment (AJAE) Vol.15 No.2
Concentrations of black carbon (BC), organic carbon (OC), and total suspended particulate matter (TSP) were simultaneously assessed in urban, rural and residential areas in Jeddah city for one year from January to December 2017. It was aimed in the present study to provide information about the spatial and seasonal variability of these aerosol species in Jeddah, and insight into sources, processes and effects of meteorological conditions. To the best of our knowledge, this is the first study investigating the variability of carbonaceous aerosols (OC and BC) in Saudi Arabia. The average concentrations of OC, BC, and TSP varied spatially and temporally. The annual average concentrations of OC, BC, and TSP were 134.05, 7.16, and 569.41 μg m-3 and 34.32, 5.14, and 240.64 μg m-3 and 10.67, 4.39 and 101.31 μg m-3 in the urban, residential and rural areas, respectively. Moreover, there was a clear seasonal variation in the concentration of carbonaceous aerosols; the highest concentrations were recorded in February and September, while the lowest concentrations of OC were recorded during April, May and August in the urban, residential and rural sites, respectively. Nevertheless, the lowest concentrations of BC were recorded during March in the urban and residential sites and during November in the rural site. The relative concentrations of OC and BC to the TSP were relatively high, and they have a significant correlation with prevalent wind speed (-0.636, and -0.581 in the urban area), (-0.539 and -0.511 in the residential area), and (-0.508 and -0.501 in the rural area), respectively. The marked differences in the concentrations of BC and OC were reflected on OC/BC ratio, which is a good representative of different source types. This preliminary study showed that the potential local sources were emissions from traffic (fossil fuel), biomass burning, anthropogenic activities (e.g. car drifting and outdoor cooking), and industrial activities. The present study suggest the presence of highly inefficient combustion sources and highlight the need for the regulation of such emissions.
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