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Azizeh Jafari,Navideh Anarjan,Hoda Jafarizadeh-Malmiri 한국식품과학회 2020 Food Science and Biotechnology Vol.29 No.3
A bottom-up approach based on solvent-displacement technique was used to prepare a-tocopherol nanoemulsions. Effects of two main evaporation parameters namely, rotation speed (1 9 10–9 9 10 rpm) and rotation time (5–15 min) of utilized vacuum rotary evaporator, on the mean particle size, polydispersity index (PDI) and a-tocopherol degradation of the formed nanodroplets were evaluated using response surface methodology. Obtained results suggested three polynomial regression models for predicting the studied response variables’ affected by selected evaporation parameters. Relatively high coefficients of determination for suggested models ([0.7839) confirmed the suitability of the generated models. Multiple-optimization procedure revealed that the optimum amounts of evaporation speed and time were 30 rpm and 10 min, respectively, which in that, prepared spherical a-tocopherol nanoemulsions had mean particle size, PDI and concentration values of 48.9 nm, 0.232 and 358.7 mg/L, respectively.
EXACT SOLUTION OF SYSTEM OF LINEAR INTEGRAL EQUATIONS USING NEW APPROXIMATE METHOD
ALIEH MADADI,AZIZEH JABBARI 장전수학회 2013 Advanced Studies in Contemporary Mathematics Vol.23 No.2
In this paper, we apply a new approximate method for solving sys-tems of linear Volterra integral equation of second kind. This method transforms the integral system into the matrix equation with the help of Taylor series. We used two numerical examples to show the accuracy and simple of our method. The solution of this system yields the Taylor coecients of the solution function. Also, this method gives the analytic solution for the system.
Seyedemad Alavitabari,Mahboube Mohamadi,Hamid Garmabi,Azizeh Javadi 한국섬유공학회 2021 Fibers and polymers Vol.22 No.3
High-density polyethylene (HDPE) based hybrid nanocomposites comprising varying concentrations of layerednanoclay (NC) and spherical nano calcium carbonate (nCaCO3) were prepared by a two-step melt compounding process inthe presence of polyethylene grafted maleic anhydride (PE-g-MA) as the compatibilizer. Regarding multiple materialvariables (the NC, nCaCO3 and compatibilizer contents) participated in fabrication of the nanocomposites, response surfacemethodology (RSM) was utilized to find the correlation between the material variables, morphology and viscoelasticresponses in the melt state. Intercalation of the layered silicates was investigated by X-ray diffraction (XRD) technique, andmorphological characterization of the nanosized calcium carbonates was carried out by scanning electron microscope (SEM). The findings indicated that higher contents of the PE-g-MA facilitated the intercalation process and increased the interlayerdistance. Interestingly, incorporation of the second nanoparticle, nano calcium carbonate, resulted in viscosity incrementwhich is an influential factor on applied stresses during the melt mixing and subsequently, dispersion state of the nanoclaylayers. The interplay between the designated material parameters was also discussed by means of interaction plots.
Acetalization of Carbonyl Compounds by Using Silica-bound Sulfuric Acid under Green Condition
Mirjalili, Bi Bi Fatemeh,Zolfigol, Mohammad Ali,Bamoniri, Abdolhamid,Hazar, Azizeh Korean Chemical Society 2004 Bulletin of the Korean Chemical Society Vol.25 No.6
Aldehydes and ketones were converted to their corresponding acetals in the presence of silica-bound sulfuric acid in n-hexane under mild and heterogeneous conditions with excellent yields.
Sanaz Malekian,Mojgan Mirghafourvand,Farzad Najafipour,Alireza Ostadrahimi,Nafiseh Ghassab-Abdollahi,Azizeh Farshbaf-Khalili 대한가정의학회 2023 Korean Journal of Family Medicine Vol.44 No.2
Background: Oxidative stress plays an essential role in bone health among postmenopausal women. This study aimed to compare the oxidative stress biomarkers among postmenopausal women aged 50–65 years with normal bone mineral density, osteopenia, and osteoporosis.Methods: In this observational study, 120 women with normal bone mineral density, 82 with osteopenia, and 86 with osteoporosis were selected based on the densitometry data obtained from the dual-energy X-ray absorptiom-etry method. The serum total antioxidant capacity (TAC), superoxide dismutase (SOD) activity, and malondialde-hyde (MDA) levels were measured using biochemical methods. A binary logistic regression model adjusted for confounders was used to estimate the risk of osteopenia and osteoporosis. The P-value of <0.05 was considered sta-tistically significant.Results: There were significant differences between the three groups in age, menopausal age, body mass index, and education (P<0.05). According to the binary logistic regression model, higher SOD activity and serum TAC lev-els were associated with a lower risk of osteoporosis (adjusted odds ratio [aOR], 0.991; 95% confidence intervals [CI], 0.986 to 0.996; and aOR, 0.373; 95% CI, 0.141 to 0.986, respectively). MDA was a significant risk factor for osteo-penia in postmenopausal women (aOR, 1.702; 95% CI, 1.125 to 2.576).Conclusion: Higher SOD activity and serum TAC levels in the studied postmenopausal women were associated with a significantly lower risk of osteoporosis. Moreover, the risk of osteopenia increased significantly with higher serum MDA levels.