http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Hafidi, Mariam,Kharchi, Fattoum,Lefkir, Abdelouhab Techno-Press 2013 Structural Engineering and Mechanics, An Int'l Jou Vol.47 No.5
Two new predictive design methods are presented in this study. The first is a hybrid method, called neuro-fuzzy, based on neural networks with fuzzy learning. A total of 280 experimental datasets obtained from the literature concerning concentric punching shear tests of reinforced concrete slab-column connections without shear reinforcement were used to test the model (194 for experimentation and 86 for validation) and were endorsed by statistical validation criteria. The punching shear strength predicted by the neuro-fuzzy model was compared with those predicted by current models of punching shear, widely used in the design practice, such as ACI 318-08, SIA262 and CBA93. The neuro-fuzzy model showed high predictive accuracy of resistance to punching according to all of the relevant codes. A second, more user-friendly design method is presented based on a predictive linear regression model that supports all the geometric and material parameters involved in predicting punching shear. Despite its simplicity, this formulation showed accuracy equivalent to that of the neuro-fuzzy model.
Mariam Hafidi,Fattoum Kharchi,Abdelouhab Lefkir 국제구조공학회 2013 Structural Engineering and Mechanics, An Int'l Jou Vol.47 No.5
Two new predictive design methods are presented in this study. The first is a hybrid method, called neuro-fuzzy, based on neural networks with fuzzy learning. A total of 280 experimental datasets obtained from the literature concerning concentric punching shear tests of reinforced concrete slab-column connections without shear reinforcement were used to test the model (194 for experimentation and 86 for validation) and were endorsed by statistical validation criteria. The punching shear strength predicted by the neuro-fuzzy model was compared with those predicted by current models of punching shear, widely used in the design practice, such as ACI 318-08, SIA262 and CBA93. The neuro-fuzzy model showed high predictive accuracy of resistance to punching according to all of the relevant codes. A second, more userfriendly design method is presented based on a predictive linear regression model that supports all the geometric and material parameters involved in predicting punching shear. Despite its simplicity, this formulation showed accuracy equivalent to that of the neuro-fuzzy model.
Belrhazi Hamza,El Hafidi Mohamed 한국물리학회 2023 Current Applied Physics Vol.52 No.-
The magnetization switching process in four-fold anisotropy materials is characterized by an intermediate state (IS) due to the interplay between magnetic anisotropy and spin-transfer torque (STT). Practically, the presence of an IS can impede the switching process in a single-step, causing switching errors during data storage. Here, we investigate the STT-induced magnetization switching in the MTJ device based on half-metallic full-Heusler Co2FeAl0.5Si0.5 (CFAS) alloy with four-fold anisotropy in the presence of voltage-controlled magnetic anisotropy (VCMA) using micromagnetic simulation. Our results demonstrate that VCMA-assisted STT can effectively tune the magnetic states during the switching by adjusting the VCMA effect at appropriate intervals and strengths. As a result, the magnetization can overcome the limitations posed by the IS in the CFAS alloy, leading to single-step switching modes for low spin current density. Additionally, we revealed that pulsed voltage-assisted STT results in shorter switching times compared to conventional switching in four-fold anisotropy materials.
Hanan Ouchene,Abir Chahouri,Najat Hafidi,Hassan Elouizgani,Jamila Hermas 한국해양과학기술원 2021 Ocean science journal Vol.56 No.4
Seasonal variations of the gonad index (GI), the biochemical composition, and the concentration of heavy metals in the gonads of the sea urchin, Paracentrotus lividus (Echinodermata: Echinoidea), were determined. Samples were collected from three sites in the Agadir region: Cap Ghir, Sidi R'bat and Anza (south coast of Morocco) between March 2018 and February 2020. This study highlights the point that at the three study sites, the gametogenic cycle of the sea urchin was annual, with a long, single spawning (spring-summer) for both cycles. Protein constituted the main component of the gonad which ranged between 23.73 and 8.11 mg/mL, while lipid and carbohydrate were also found in considerable amounts. The maximum levels of proteins in the gonad coincided with the highest GI values, there being evidence of gonad protein requirements during gametogenesis. Heavy metals (Cu, Pb, and Cd) were present with very low values and this reflects the health of the Coastal ecosystem of Cap Ghir and Sidi R'bat. For Anza, we noticed higher values than the other sites, due to the presence of industries and urban development.
Evidence for the onset of color transparency in ρ<sup>0</sup> electroproduction off nuclei
CLAS Collaboration,El Fassi, L.,Zana, L.,Hafidi, K.,Holtrop, M.,Mustapha, B.,Brooks, W.K.,Hakobyan, H.,Zheng, X.,Adhikari, K.P.,Adikaram, D.,Aghasyan, M.,Amaryan, M.J.,Anghinolfi, M.,Arrington, J.,Ava North-Holland Pub. Co 2012 Physics letters: B Vol.712 No.4
We have measured the nuclear transparency of the incoherent diffractive A(e,e<SUP>'</SUP>ρ<SUP>0</SUP>) process in <SUP>12</SUP>C and <SUP>56</SUP>Fe targets relative to <SUP>2</SUP>H using a 5 GeV electron beam. The nuclear transparency, the ratio of the produced ρ<SUP>0</SUP>@?s on a nucleus relative to deuterium, which is sensitive to ρA interaction, was studied as function of the coherence length (l<SUB>c</SUB>), a lifetime of the hadronic fluctuation of the virtual photon, and the four-momentum transfer squared (Q<SUP>2</SUP>). While the transparency for both <SUP>12</SUP>C and <SUP>56</SUP>Fe showed no l<SUB>c</SUB> dependence, a significant Q<SUP>2</SUP> dependence was measured, which is consistent with calculations that included the color transparency effects.
Mutaz Al-Alawi,Loubna El Fels,Ramadan Benjreid,Tamas Szegi,Mohamed Hafidi,Barbara Simon,Miklos Gulyas 대한환경공학회 2020 Environmental Engineering Research Vol.25 No.3
Composting is among the most effective integrated waste management strategies used to recycle sewage sludge (SS) waste and generate a useful product. An encapsulated lifting system is a relatively new industrial-scale composting technology. The objective of this study was to evaluate the effectiveness of composting dewatered stabilized SS mixed with green waste using this new technology. The composting process was monitored by changes in the physico-chemical properties, UV-visible spectra, and fourier transform infrared (FTIR) spectra. The composting temperature was steady in the thermophilic range for 24 and 12 d in the intensive and maturation phases, respectively, which fulfilled the disinfection requirement. Moreover, the temperature increased rapidly to 76.8°C within three days, and the thermophilic temperatures peaked twice and lasted longer than in traditional composting, which accelerated SS degradation and decreased the composting period necessary to obtain mature compost. FTIR spectroscopic analysis showed a diminished in methyl group derived from methylene C-H aliphatic groups because of organic matter degradation by microorganisms and an increased number of aromatic chains. The new technology may be a viable and sustainable alternative for SS management that converts waste into compost that is useful as a soil amendment.
Yassine Zegzouti,Aziz Boutafda,Loubna El Fels,Miloud El Hadek,Fatou Ndoye,Nalla Mbaye,Lamfeddal Kouisni,Mohamed Hafidi 대한환경공학회 2020 Environmental Engineering Research Vol.25 No.5
This study aims to use contaminated soil with leachate to select autochthonous fungi that are able to bioremediate three types of leachate, (Young (YL), Intermediate (IL) and Old (OL)). Eleven fungal species were isolated via the enrichment method using the leachate as the sole source of carbon and energy. The isolates were evaluated for their ability to grow and remove organic pollutants at 100%, 50% and 25% (v/v) of leachate in both solid and liquid cultures that were spiked with malt extract. The results indicated that only three fungi, Aspergillus flavus (A. flavus-LC106118), Aspergillus niger (A. niger-KT192262) and Fusarium solani (F. solani-KX349467) showed significantly high capacity to grow on leachate, with maximum radial growth rates (Gr) of 7.5 ㎜, 4.7 ㎜, and 5.3 ㎜, respectively. In addition, 34%, 22%, and 27%, respectively of COD removal rates were obtained at 25% concentration in YL. A. flavus was the most tolerant fungus against landfill leachate, followed by F. solani, and finally A. niger. Therefore, these three fungi are good candidates for leachate bioremediation. However, for a better remediation, the combined effects of different types of fungi and leachates on the fungal growth need to be considered during the fungi selection.