排序方式: 共有132条查询结果,搜索用时 62 毫秒
81.
82.
Pekpe K. Midzodzi Zitouni Djamel Gasso Gilles Dhifli Wajdi Guinhouya Benjamin C. 《Applied Intelligence》2022,52(1):71-80
Applied Intelligence - Common compartmental modeling for COVID-19 is based on a priori knowledge and numerous assumptions. Additionally, they do not systematically incorporate asymptomatic cases.... 相似文献
83.
Djamel. Haddad Kafia. Oulmi Hocine. Benmoussa Zeroual. Aouachria Noureddine. Bourmada 《International Journal of Hydrogen Energy》2013
The aim of this work is to present a two-dimensional transient model, of heat and mass transfer in a proton exchange membrane fuel cell (PEMFC). The model includes various conservation equations such as mass (hydrogen, oxygen, water concentration), Momentum and energy equations this model is combined with the electrochemical model. 相似文献
84.
Djamel Haddad Hocine Benmoussa Noureddine Bourmada Kafia Oulmi Bouziane Mahmah Maïouf Belhamel 《International Journal of Hydrogen Energy》2009
The objective of our study is to quantify the mass water transferred by various modes: diffusion, convection and migration. For the water transfer, the principal forces considered in the model are, the convection force, the osmotic force (i.e. diffusion) and the electric force (migration). The first of these forces results from a pressure gradient, the second of a concentration gradient and the third of a protons' migration from the anode to the cathode, which has an effect on the dipole of the water molecules (resistance force to the advancement). The numerical tool used to solve the equations' system is the finite element method. The results obtained numerically considering this method are concentration profiles and concentration variation with time and membrane thickness. These results illustrate the contribution of each mass transfer mode. 相似文献
85.
Loubna Chetibi Amine Achour Jerzy Peszke Djamel Hamana Slimane Achour 《Journal of Materials Science》2014,49(2):621-632
Nano-hydroxyapatite (HA) was grown on functionalized multiwalled carbon nanotubes (MWCNTs) deposited on TiO2 nanofibers (NFs) that were hydrothermally grown on Ti metal sheets. The HA was electrochemically grown on the MWCNTs/TiO2 porous layer. It was found that the HA grows on the MWCNTs/TiO2 NFs in the form of dense coating with nanorice grain-shaped. The incorporation of MWCNTs between HA and TiO2 NFs has led to higher adhesion strength as measured by micro-scratching test indicating the benefit of MWCNTs on the improving the bonding strength of HA layer. The obtained coatings exhibit excellent corrosion resistance in simulated body fluid. It is expected that this simple route for preparing the new HA/MWCNTs/TiO2/Ti-layered structure might be used not only in the biomedical field, but also in catalysis and biological sensing among others. 相似文献
86.
87.
88.
Abdesselam Hocini Ahmed Bouchelaghem Djamel Saigaa Mounir Bouras Touraya Boumaza Mohamed Bouchemat 《Journal of Computational Electronics》2013,12(1):50-55
We report on the theoretical study of magneto optical rib waveguides with two kinds of silica type matrix doped by magnetic nanoparticles and made by sol–gel process (SiO2/ZrO2 film or SiO2/TiO2). The mode propagation and the light confinement are simulated using software based on a Film Mode Matching method. The modeling is based on geometrical adjustments of the rib waveguide. We propose from those results magneto optical waveguide geometries for optical integrated applications. 相似文献
89.
Genetic-based EM algorithm for learning Gaussian mixture models 总被引:3,自引:0,他引:3
Pernkopf F Bouchaffra D 《IEEE transactions on pattern analysis and machine intelligence》2005,27(8):1344-1348
90.
Djamel Tahtat Mohamed Mahlous 《Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms》2007,265(1):425-428
The effect of gamma irradiation on the N-deacetylation of chitin to form chitosan was studied. Chitin from crab shells was irradiated up to 20 kGy and N-deacetylated in aqueous NaOH solution (40% and 60% w/w) at 60 and 100 °C for 60 min. The degree of N-deacetylation (DD) of non-irradiated and irradiated samples was determined by IR-band ratio method. It was found that higher extent of N-deacetylation was achieved for the chitin samples irradiated up to 20 kGy doses as compared to non-irradiated chitin. The DD values of chitin, prepared from non-irradiated and 20 kGy irradiated chitins by N-deacetylation at 60 °C with 40% NaOH for 60 min, were found to be 38% and 60%, respectively. The increase in DD by irradiation was interpreted as a result of reduction in molecular weight of chitin. Low dose irradiation of chitin has provided the possibility of its N-deacetylation into chitosan at much milder reaction conditions. 相似文献