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RISS 인기검색어
- 검색키워드
- 저자 : Shoeib, M. (검색결과 5 건)
- 무료
- 기관 내 무료
- 유료
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Optimization of Ni<sup>2+</sup> adsorption on 13X zeolite using box-behnken design
Jafari, Shoeib,Bandarchian, Farideh Techno-Press 2017 Advances in environmental research Vol.6 No.3
In this study, the elimination of $Ni^{2+}$ using 13X sorbent due to an electrostatic interaction was reported. The significant factors including pH, time and 13X sorbent amount were investigated using Box-Behnken design (BBD). In the optimum experimental conditions, the linear rang and limit of detection of the proposed method were 0.1-20 and $0.102mg\;L^{-1}$, respectively. The precision as RSD% was 1.3% for concentration of $2mg\;L^{-1}$. Concerning the excellent recoveries in a short time with highly efficient sample clean-up and removal, this method may be a very powerful and innovative future sample removal technique. To the best of our knowledge, this is the first report on using BBD for optimizing the parameters affected the removal of $Ni^{2+}$ by 13X zeolite sorbent.
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Constructal design of finned tubes used in air-cooled heat exchangers
Hossein Shokouhmand,Shoeib Mahjoub,Mohammad Reza Salimpour 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.6
The present study documents the constructal design and optimization of finned tubes used in air-cooled heat exchangers. The consideredtubes are equipped with annular fins. The aim is to minimize the overall thermal resistance by morphing the geometry. The geometricaland thermo-physical parameters considered are the number of fins, ratio of fin height to tube diameter, Stanton number, ratio of finconductivity to air conductivity, ratio of in-tube fluid conductivity to air conductivity and dimensionless pressure drop. Two constraintsare applied in the optimization process: fixed overall volume of heat exchanger and fixed volume fraction of fin material. It is found thatthere exist optimal values for the number and the height of fins. Moreover, the optimal heat transfer has an extremum in a special volumefraction of fin material.
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Tian, Z.,Kim, S.K.,Shoeib, M.,Oh, J.E.,Park, J.E. Elsevier Pub.Co 2016 Science of the Total Environment Vol.553 No.-
A wide range of per- and polyfluoroalkyl substances (PFASs), including fluorotelomer alcohols (FTOHs), perfluorooctane sulfonamidoethanols (FOSEs), perfluoroalkyl carboxylic acids (PFCAs), and perfluoroalkane sulfonic acids (PFSAs), were measured in fifteen house dust and two nonresidential indoor dust of Korea. Total concentrations of PFASs in house dust ranged from 29.9 to 97.6ngg<SUP>-1</SUP>, with a dominance of perfluorooctane sulfonic acid (PFOS), followed by 8:2 FTOH, N-Ethyl perfluorooctane sulfonamidoethanol (EtFOSE), perfluoroctanoic acid (PFOA). In a typical exposure scenario, the estimated daily intakes (EDIs) of total PFASs via house dust ingestion were 2.83ngd<SUP>-1</SUP> for toddlers and 1.13ngd<SUP>-1</SUP> for adults, which were within the range of the mean EDIs reported from several countries. For PFOA and PFOS exposure via house dust ingestion, indirect exposure (via precursors) was a minor contributor, accounting for 5% and 12%, respectively. An aggregated exposure (hereafter, overall-EDIs) of PFOA and PFOS occurring via all pathways, estimated using data compiled from the literature, were 53.6 and 14.8ngd<SUP>-1</SUP> for toddlers, and 20.5 and 40.6ngd<SUP>-1</SUP> for adults, respectively, in a typical scenario. These overall-EDIs corresponded to 82% (PFOA) and 92% (PFOS) of a pharmacokinetic model-based EDIs estimated from adults' serum data. Direct dietary exposure was a major contributor (>89% of overall-EDI) to PFOS in both toddlers and adults, and PFOA in toddlers. As for PFOA exposure of adults, however direct exposure via tap water drinking (37%) and indirect exposure via inhalation (22%) were as important as direct dietary exposure (41%). House dust-ingested exposure (direct+indirect) was responsible for 5% (PFOS in toddlers) and <1% (PFOS in adults, and PFOA in both toddlers and adults) of the overall-EDIs. In conclusion, house-dust ingestion was a minor contributor in this study, but should not be ignored for toddlers' PFOS exposure due to its significance in the worst-case scenario.
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Localization of S-100 proteins in the testis and epididymis of poultry and rabbits
Ahmed Abd Elmaksoud,Mahmoud Badran Shoeib,Hany E S Marei 대한해부학회 2014 Anatomy & Cell Biology Vol.47 No.3
The present investigation was conducted to demonstrate S-100 protein in the testis and epididymis of adult chickens, Sudani ducks, pigeons, and rabbits. This study may represent the first indication for the presence of S-100 in the male reproductive organs of these species and might therefore serve as a milestone for further reports. In the testis of chickens, pigeons and rabbits, intense S-100 was seen in Sertoli cells. S-100 was also seen in the endothelial lining of blood vessels in rabbit testis. On the contrary, no S-100 reaction was detected in the Sertoli cells of Sudani ducks. In epididymis, the localization of S-100 had varied according to species studied; it was seen in the basal cells (BC) of epididymal duct in duck, non-ciliated cells of the distal efferent ductules in pigeons and ciliated cells of the efferent ductules and BC of rabbit epididymis. Conversely, S-100 specific staining was not detected in the epithelial lining of the rooster and pigeon epididymal duct as well as the principal cells of the rabbit epididymis. In conclusion, the distribution of the S-100 proteins in the testis and epididymis might point out to its roles in the male reproduction.
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