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Sahnoun, Mouna,Kriaa, Mouna,Besbes, Souhail,Jardak, Mohamed,Bejar, Samir,Kammoun, Radhouane 한국식품과학회 2016 Food Science and Biotechnology Vol.25 No.5
A simplex-centroid experimental design was used for the optimization of both reducing and oxidizing improvers, namely Aspergillus oryzae S2 ${\alpha}$-amylase (Amy), ascorbic acid (Asc), and glucose oxidase (GOD). This optimization was performed to enhance the dough and breadmaking qualities of soft French wheat flour and a composite counterpart that contained 30% Ukrainian wheat flour. Statistically significant correlations were calculated between the W index and textural parameters (e.g., dough chewiness and bread cohesiveness). The findings revealed that while the best mixture for French flour comprised 21.8% of Amy, 41.2% of Asc, and 37% of GOD, for the composite counterpart, it comprised 2.3% of Amy, 66% of Asc, and 31.7% of GOD. These optimized mixtures rearranged soft French wheat flour and its composite counterpart to a good quality and an improved flour texture, respectively. Additionally, they increased the loaf specific volumes of the breads made from soft French wheat flour and its counterpart by 25.8 and 45.43%, respectively, significantly decreased the breads' susceptibility to microbial contamination, and reclassified the breads as "good" in terms of sensory attributes.
Marwa Sahnoun,Chokri Abdennadher 한국국제경제학회 2018 International Economic Journal Vol.32 No.4
This article is timely to evaluate Active Labor Market Policies (ALMPs) in Tunisia in 7 regions throughout the period from 2005 to 2014 with reference to OECD countries. Massive unemployment in Tunisia resisted during this period (15,3% in 2014), followed by major changes after the transition period. In order to study the efficiency levels achieved by the Tunisian Active Labor Market Policies, we propose a parametric method, namely the Stochastic Frontier Approach ‘SFA’. Our results show that the total ALMPs significantly affects the unemployment rate. Thus, the average efficiency score of ALMP in Tunisia (0,94) is lower than that of the OECD countries (0,97). The divergence is due to structural and cyclical differences, which highlights the imperative to adopt a model adequate to the specificity of Tunisia. Tunisian public employment service policies have been shown to be insignificant compared to those of OECD countries. Start-up incentives seem to be the most effective policy to reduce the unemployment rate in the OECD countries’ and Tunisia because of its low cost.
Mouna Sahnoun,Mouna Kriaa,Souhail Besbes,Mohamed Jardak,Samir Bejar,Radhouane Kammoun 한국식품과학회 2016 Food Science and Biotechnology Vol.25 No.5
A simplex-centroid experimental design was used for the optimization of both reducing and oxidizing improvers, namely Aspergillus oryzae S2 α-amylase (Amy), ascorbic acid (Asc), and glucose oxidase (GOD). This optimization was performed to enhance the dough and breadmaking qualities of soft French wheat flour and a composite counterpart that contained 30% Ukrainian wheat flour. Statistically significant correlations were calculated between the W index and textural parameters (e.g., dough chewiness and bread cohesiveness). The findings revealed that while the best mixture for French flour comprised 21.8% of Amy, 41.2% of Asc, and 37% of GOD, for the composite counterpart, it comprised 2.3% of Amy, 66% of Asc, and 31.7% of GOD. These optimized mixtures rearranged soft French wheat flour and its composite counterpart to a good quality and an improved flour texture, respectively. Additionally, they increased the loaf specific volumes of the breads made from soft French wheat flour and its counterpart by 25.8 and 45.43%, respectively, significantly decreased the breads’ susceptibility to microbial contamination, and reclassified the breads as “good” in terms of sensory attributes.
Optimization of Submerged Aspergillus oryzae S2 α-Amylase Production
Belgacem Naili,Mouna Sahnoun,Samir Bejar,Radhouane Kammoun 한국식품과학회 2016 Food Science and Biotechnology Vol.25 No.1
Use of 4 agro-industrial by products and organic materials as nitrogen sources for production of Aspergillus oryzae S2 α-amylase in liquid culture was investigated. The 2 agro-industrial byproducts maltose and saccharose, and also lactose and starch were individually evaluated for use as carbon sources. A Box-Behnken experimental design was used to determine optimal conditions for production of α-amylase. A maximum amylase activity of 750 U/mL was obtained at a temperature of 24oC, a urea concentration of 1 g/L, and a C/N ratio of 2. Laboratory scale application of optimal conditions in a 7 L fermentor produced a final α-amylase activity of 770 U/mL after 3 days of batch cultivation. Addition of 10% starch to the culture medium each 12 h immediately after the stationary phase of cell growth led to a production yield of 1,220 U/mL at the end of fed-batch cultivation.
Curvature ductility of confined HSC beams
Bouzid Haytham,Idriss Rouaz,Sahnoune Ahmed,Benferhat Rabia,Tahar Hassaine Daouadji 국제구조공학회 2024 Structural Engineering and Mechanics, An Int'l Jou Vol.89 No.6
Tahar Hassaine Daouadji2,4 The present paper investigates the curvature ductility of confined reinforced concrete (RC) beams with normal (NSC) and high strength concrete (HSC). For the purpose of predicting the curvature ductility factor, an analytical model was developed based on the equilibrium of internal forces of confined concrete and reinforcement. In this context, the curvatures were calculated at first yielding of tension reinforcement and at ultimate when the confined concrete strain reaches the ultimate value. To best simulate the situation of confined RC beams in flexure, a modified version of an ancient confined concrete model was adopted for this study. In order to show the accuracy of the proposed model, an experimental database was collected from the literature. The statistical comparison between experimental and predicted results showed that the proposed model has a good performance. Then, the data generated from the validated theoretical model were used to train the artificial neural network (ANN) prediction model. The R² values for theoretical and experimental results are equal to 0.98 and 0.95, respectively which proves the high performance of the ANN model. Finally, a parametric study was implemented to analyze the effect of different parameters on the curvature ductility factor using theoretical and ANN models. The results are similar to those extracted from experiments, where the concrete strength, the compression reinforcement ratio, the yield strength, and the volumetric ratio of transverse reinforcement have a positive effect. In contrast, the ratio and the yield strength of tension reinforcement have a negative effect.
New K-shell fluorescence yields Curve for elements with 3 Z 99
Salim Daoudi,Abdelhalim Kahoul,Yassine Sahnoune,Bahri Deghfel,Yazid. Kasri,Farid Khalfallah,Volkan Aylikci,Nuray K¨up Aylikci,Djamel Edine Medjadi,Mohammed Nekkab 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.67 No.9
The measured K-shell fluorescence-yield values reported in the literature from 1934 to 2015 (about 737 new measurements) were used to deduce new empirical K-shell fluorescence yields for elements in the atomic range 3 Z 99. In order to deduce the empirical K-shell fluorescence yield, the experimental data were fitted using the quantity (!K/(1 − !K))1/4 with respect to the atomic number Z. The results were compared to other theoretical, semi-empirical and experimental values reported in the literature. Reasonable agreement was obtained between our result and those of other works.