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RISS 인기검색어
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- 저자 : M. Kaddour (검색결과 3 건)
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Kinetic and equilibrium studies of cobalt adsorption on apricot stone activated carbon
M. Abbas,S. Kaddour,M. Trari 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.3
The activated carbon from apricot stone with H3PO4 and its ability to remove Co2+ are reported. The FTIRspectroscopy brings insights on interactions between the functional groups of the carbon and Co2+. Adsorption studies are carried in batch mode by varying the initial Co2+ concentration and pH. Acomparison of two kinetic models on the overall adsorption rate shows that the system is described bythe pseudo-second-order kinetic model. The Freundlich model fits the data with a monolayer adsorptioncapacity of 111.11 mg/g at pH 9. The enthalpy and free energy indicate an endothermic and notspontaneous process.
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M. Makhloul,H. Boukhal,E. Chakir,T. El Bardouni,M. Lahdour,M. Kaddour,Abdulaziz Ahmed,A. Arectout,H. El Yaakoubi 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.2
In order to study the sensitivity and the uncertainty of the Moroccan research reactor TRIGA Mark II, amodel of this reactor has been developed in our ERSN laboratory for use with the N-Particle MCNP MonteCarlo transport codes (version 6). In this article, the sensitivities of the effective multiplication factor ofthis reactor are evaluated using the ENDF/B-VII.0, ENDF/B-VII.1 and JENDL-4.0 libraries and in 44 energygroups, for the cross sections of the fuel (U-235 and U-238) and the moderator (H-1 and O-16). However,the quantification of the uncertainty of the nuclear data is performed using the nuclear code NJOY99 forthe generation and processing of covariance matrices. On the one hand, the highest uncertainty deviations, calculated using the ENDFB-VII.1 and JENDL4.0 evaluations, are 2275, 386 and 330 pcmrespectively for the reactions U235(n, f), U235(nn) and H1(n, g). On the other hand, these differences arevery small for the neutron reactions of O-16 and U-238. Regarding the neutron spectra, in CT-mid plane,they are very close for the three evaluations (ENDF/B-VII.0, ENDF/B-VII.1 and JENDL-4.0). These spectrapresent two peaks (thermal and fission) around the energies 0.05 eV and 1 MeV
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Investigation of rapid thermal oxide/ silicon nitride passivation stack of nþ emitter
A. El Amrani,R. Si Kaddour,M. Maoudj,A. El Kechai,S. Mezghiche 한국물리학회 2015 Current Applied Physics Vol.15 No.12
To anticipate the initial phosphorus diffusion parameters of silicon solar cells process fabrication, we report in this paper an overview of our experiments on silicon nþ-emitters passivation by means of rapid thermal silicon oxide/silicon nitride stack. The process-induced changes have been evaluated and explained.We found that 900 C and 80 s were the appropriate process parameters to grow 10 nm silicon oxide. Investigation of the effect of this oxidation on nþ multicrystalline silicon emitters revealed a large decrease (more than 25%) of the sheet resistance and around 12% increase of the junction depth. The experiments also revealed that the passivation effect of the optimal silicon oxide/silicon nitride stack is efficient only for higher emitter quality. In addition, we found that this stack reduces the surface reflection more than the optimal single silicon nitride layer.
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