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- 저자 : Saber Amiri (검색결과 3 건)
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Samaneh Amiri,Mahmoud Rezazadeh-Bari,Mohammad Alizadeh-Khaledabad,Saber Amiri 한국식품과학회 2019 Food Science and Biotechnology Vol.28 No.2
In the present study, the effects of differentratios of milk phospholipids, cholesterol and phytosterols(Campesterol) powder (50–100%, 0–50%, and 0–50%,respectively) and sonication time (20, 25, 30, 35 and40 min) were investigated to produce a new formulation ofnanoliposomes for encapsulation of vitamin C. The resultsshowed that increasing the time of sonication anddecreasing the ratio of phospholipid to phytosterol significantlydecreased nanoliposomes’ particle size (p\0.05). The maximum encapsulation efficiency was obtained at 35and 40 min of sonication time and 75–25 ratio of phospholipid:phytosterol. Also, reducing the sonication time inthe same ratio of phospholipid/phytosterol caused toincrease the controlled release. The highest stability ofvitamin C during 20 days was obtained in the ratio of75–25 (phospholipids: campesterol). The results showed apositive effect of cholesterol replacement with campesterolon encapsulation efficiency, control release and stability ofvitamin C in nanoliposomes.
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Numerical simulation of a viscoelastic RANS turbulence model in a diffuser
Saber Azad,Hamed Amiri Moghadam,Alireza Riasi,Hossien Mahmoodi Darian 한국유변학회 2018 Korea-Australia rheology journal Vol.30 No.4
One of the newest viscoelastic RANS turbulence models for drag reducing flows with polymer additives is studied considering different rheological properties. A finitely extensible nonlinear elastic-Peterlin (FENE-P) constitutive model is used to describe the viscoelastic effect of the polymer solutions and the k − ε −ν² − f turbulence framework is applied for turbulence modelling. The geometry in this study is a twodimensional diffuser. The finite volume method (FVM) with a non-uniform collocated mesh is used to solve the momentum and constitutive equations. In order to evaluate the turbulence model, the flow is simulated with different parameters such as the Weissenberg number and the maximum polymer extensibility and compared with the experimental results qualitatively. The velocity profiles, pressure distribution, reattachment length, and the amount of the drag reduction predicted by the turbulence model are in line with the experimental results.
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The Use of Bootstrap for Weight Control in Data Envelopment Analysis
Akbar Amiri,Saber Saati,Alireza Amirteimoori 대한산업공학회 2018 Industrial Engineeering & Management Systems Vol.17 No.4
Data Envelopment Analysis includes a wide range of mathematical models and is used for assessing the relative efficiencyof a set of homogenous Decision Making Units (DMUs). Multiplicative DEA models achieve a set of weightsfor input and output variables for each DMU. Based on these weights, relative efficiency of each DMU is evaluated. Determining different weights for same factor in a set of homogenous DMUs is not realistic. To solve this problem,Common Set of Weights (CSW) is used. To improve the results of DEA models and reduce the weight flexibility,bootstrap method is used to determine a CSW. The aim of this article is to determine the CSW by finding a confidenceinterval for weights with bootstrap. By evaluating these intervals, a Probabilistic Common Set of Weights (PCSW) isobtained, which provides flexibility for weights.
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