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RISS 인기검색어
- 검색키워드
- 저자 : Ahmadi Seyed Javad (검색결과 4 건)
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Seyed Javad Ahmadi,Neda Akbari,Zahra Shiri-Yekta,Mohammad Hossein Mashhadizadeh,Morteza Hosseinpour 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.3
This study focuses mainly on the synthesis of MnO2-ZrO2 nano-composite as a new inorganic adsorbent. Supercritical water was used as a preparation medium for particle deposited materials. MnO2-ZrO2 was prepared frommetal nitrate solutions in supercritical region. The resulting sample was characterized by Fourier transform infrared(FTIR), X-ray fluorescence (XRF), X-ray powder diffraction (XRD), thermogravimetric analysis (TGA) and transmissionelectron microscope (TEM). Analyses of the TEM images show the possibility for crystallizing nano-sized particles. The synthesized adsorbent was then used for the removal of strontium(II) from the nuclear waste. Moreover, anumber of factors such as aqueous phase pH, contact time and initial metal ions concentration in the adsorption processwere investigated. Comparison of the adsorption efficiency of the MnO2-ZrO2 nano-particles with those of thenon-nano particles shows a shift of uptake of the metal ions vs. pH curves towards lower pH values and a significantimprovement in adsorption of strontium ions was observed by using the nano-adsorbent. The kinetic data correspondswell to the pseudo-second-order equation. The adsorption data for strontium(II) were well fitted by the Langmuir isotherm. The synthesized nano-composite also showed a strong affinity toward the removal of Y(III), Ni(II), Pb(II) andCo(II) from the nuclear radioactive waste.
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Hamidreza Abdolsamadi,Fatemeh Ahmadi-Motamayel,Nasrin Rafieian,Mohammad Taghi Goodarzi,Javad Feradmal,Seyed-Mostafa Hoseyni,Mina Jazayeri,Zahrasadat Taghavi,Poorandokht Davoodi 전남대학교 의과학연구소 2014 전남의대학술지 Vol.50 No.2
Oral lichen planus (OLP) is a chronic inflammatory mucosal disease of unknownetiology. Many studies have implicated the protective role of antioxidants in suchdiseases. The aim of this study was to compare salivary total antioxidant capacity (TACand malondialdehyde (MDA) and antioxidant vitamin (vitamin s A, C and E) levels inpatients with erosive OLP and healthy individuals. Thirty six patients with OLP (14males, 22 females) and 36 control subjects (15 males, 21 females), matched for age andsex were enrolled in this case control study. The salivary levels of MDA, TAC, and antioxidantvitamin levels were measured in both case and control groups. The salivarylevel of MDA was significantly higher (p<0.001) in patients than in controls. In patientswith OLP, the TAC of saliva was significantly lower than that in healthy subjects (p<0.001). Compared with controls, the levels of salivary antioxidant vitamins were significantlydecreased in patients with OLP (p<0.001). In addition, a positive correlationwas found between the decrease in the salivary amount of vitamin C and that in vitaminE in patients and controls. In addition to the lower salivary levels of antioxidant vitaminsand the lower TAC, the higher level of MDA in patients with OLP suggests thatfree radicals and the resulting oxidative damage may be important in the pathogenesisof OLP lesions.
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Mahdi Rezaeian,Jamshid Kamali,Seyed Javad Ahmadi,Mohammad Amin Kiani 한국원자력학회 2017 Nuclear Engineering and Technology Vol.49 No.7
In order to perform dry interim storage and transportation of the spent-fuel assemblies of the BushehrNuclear Power Plant, dual-purpose casks can be utilized. The effectiveness of different neutron-shieldmaterials for the dual-purpose cask was analyzed through a set of calculations carried out using theMonte Carlo N-Particle (MCNP) code. The dose rate for the dual-purpose cask utilizing the recentlydeveloped materials of epoxy/clay/B4C and epoxy/clay/B4C/carbon fiber was less than the allowableradiation level of 2 mSv/h at any point and 0.1 mSv/h at 2 m from the external surface of the cask. Byutilization of epoxy/clay/B4C instead of an ethylene glycol/water mixture, the dose rates on the sidesurface of the cask due to neutron sources and consequent secondary gamma rays will be reduced by17.5% and 10%, respectively. The overall dose rate in this case will be reduced by 11%.
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Attar Nosrati Sima,Alizadeh Robabeh,Ahmadi Seyed Javad,Erfani Mostafa 한국세라믹학회 2020 한국세라믹학회지 Vol.57 No.6
It is known that the physicochemical characteristics of nanocomposites strongly aff ected by synthesis route and conditions. In this study, hydroxyapatite–chitosan nanocomposite as a substance with extensive medical application has been prepared by precipitation method under controlled conditions. To evaluation of the main synthesis parameters, including mixing ratio of precursors, pH and drying condition and investigation of their eff ect on the fi nal products characteristics, a statistical design of experiments approach via Minitab 18 has been applied. For this purpose 12 sets of experimental run have been designed and performed based on various combinations of aforementioned parameters and the characteristics of the prepared samples have been elucidated by means of Fourier transformed infrared spectroscopy, X-ray diff raction, thermogravimetric analysis, scanning electron microscopy, transmission electron microscopy and the particle size analysis. The results represent the potential impact of synthesis parameters, their interaction with each other and estimation of optimum synthesis conditions. It is revealed that mean particle size of HA-CS nanocomposite reduced by increasing the content of hydroxyapatite and increment of reaction pH to values higher than 10. Also it is founded that freeze drying process, can be used as a superior drying method for the preparation of HA-CS nanocomposite with uniform particle size.
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