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- 저자 : S. Navaei (검색결과 4 건)
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Sarah A. Johnson,Negin Navaei,Shirin Pourafshar,Salvador J. Jaime,Neda S. Akhavan,Stacey Alvarez-Alvarado,Gabriela V. Proano,Nicole S. Litwin,Elizabeth A. Clark,Elizabeth M. Foley,Kelli S. George,Marc 한국식품영양과학회 2020 Journal of medicinal food Vol.23 No.12
Greater than one-third of adults in the United States have metabolic syndrome (MetS), a cluster of risk factors highly associated with the development of cardiovascular diseases. Premature vascular dysfunction in MetS may lead to accelerated age-related atherogenesis and arterial stiffening, thereby increasing cardiovascular risk. Montmorency tart cherries (Prunus cerasus L.) are rich in bioactive compounds, such as anthocyanins, known to exert cardiovascular protective effects. Previous research suggests that tart cherry juice consumption may improve cardiovascular health. The objective of this study was to evaluate the effects of daily consumption of tart cherry juice on hemodynamics, arterial stiffness, and blood biomarkers of cardiovascular and metabolic health in men and women with MetS. In a randomized, single-blind, placebo-controlled, parallel-arm pilot clinical trial, 19 men and women 20 to 60 years of age with MetS consumed 240 mL of tart cherry juice (Tart Cherry; n = 5 males, 4 females) or an isocaloric placebo-control drink (Control; n = 5 males, 5 females) twice daily for 12 weeks. Arterial stiffness (pulse wave velocity), brachial and aortic blood pressures, wave reflection (augmentation index), and blood biomarkers of cardiovascular and metabolic health were assessed at baseline and 6 and 12 weeks. Oxidized low-density lipoprotein and soluble vascular cell adhesion molecule-1 were significantly lower (P = .047 and P = .036, respectively) in Tart Cherry than Control at 12 weeks, but were not significantly lower than baseline values. There was a trend for total cholesterol to be lower (P = .08) in Tart Cherry than Control at 12 weeks. No significant changes were observed in hemodynamics, arterial stiffness, or other blood biomarkers assessed. These results suggest that daily tart cherry consumption may attenuate processes involved in accelerated atherogenesis without affecting hemodynamics or arterial stiffness parameters in this population. The pilot nature of this study warrants interpreting these findings with caution, and future clinical trials with a larger sample size are needed to confirm these findings.
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Effect of second metal on the selectivity of Mn/H-ZSM-5 catalyst in methanol to propylene process
N. Hadi,S.R. Nabavi,A. Niaei,M. Navaei Shirazi,R. Alizadeh 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.29 No.-
In order to attain to the higher selectivity of propylene in the process of methanol conversion topropylene (MTP) over H-ZSM-5, the bi element catalysts were prepared by Mn/H-ZSM-5 and each ofCe, Cr, Fe, P and Ni promoters. The results revealed that the Ce–Mn/H-ZSM-5 demonstrated the highestselectivity to propylene. Response surface methodology was applied to optimize the preparationparameters (second metal loading, calcination temperature and calcination time) of the bimetallicCe–Mn/H-ZSM-5 catalyst. Kinetic modeling is performed in the reaction temperature range of440–500 8C and in the different weight hourly space velocities of methanol (i.e., 2.51, 4.18 and8.37 h 1). A reaction mechanism based on the theory of hydrocarbon pool and conjugate methylation/cracking mechanisms is applied for the MTP. The hybrid genetic algorithm is employed to calculate thekinetic parameters.
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Evaluation of performance of eccentric braced frame with friction damper
J. Vaseghi Amiri,B. Navayinia,S. Navaei 국제구조공학회 2011 Structural Engineering and Mechanics, An Int'l Jou Vol.39 No.5
Nonlinear dynamic analysis and evaluation of eccentric braced steel frames (EBF) equipped with friction damper (FD) is studied in this research. Previous studies about assessment of seismic performance of steel braced frame with FD have been generally limited to installing this device in confluence of cross in concentrically braced frame such chevron and x-bracing. Investigation is carried out with three types of steel frames namely 5, 10 and 15 storeys, representing the short, medium and high structures respectively in series of nonlinear dynamic analysis and 10 slip force values subjected to three different earthquake records. The proper place of FD, rather than providing them at all level is also studied in 15 storey frame. Four dimensionless indices namely roof displacement, base shear, dissipated energy and relative performance index (RPI) are determined in about 100 nonlinear dynamic analyses. Then average values of maximum roof displacement, base shear, energy dissipated and storey drift under three records for both EBF and EBF equipped with friction damper are obtained. The result indicates that FD reduces the response compared to EBF and is more efficient than EBF for taller storey frames.
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Evaluation of performance of eccentric braced frame with friction damper
Vaseghi Amiri, J.,Navayinia, B.,Navaei, S. Techno-Press 2011 Structural Engineering and Mechanics, An Int'l Jou Vol.39 No.5
Nonlinear dynamic analysis and evaluation of eccentric braced steel frames (EBF) equipped with friction damper (FD) is studied in this research. Previous studies about assessment of seismic performance of steel braced frame with FD have been generally limited to installing this device in confluence of cross in concentrically braced frame such chevron and x-bracing. Investigation is carried out with three types of steel frames namely 5, 10 and 15 storeys, representing the short, medium and high structures respectively in series of nonlinear dynamic analysis and 10 slip force values subjected to three different earthquake records. The proper place of FD, rather than providing them at all level is also studied in 15 storey frame. Four dimensionless indices namely roof displacement, base shear, dissipated energy and relative performance index (RPI) are determined in about 100 nonlinear dynamic analyses. Then average values of maximum roof displacement, base shear, energy dissipated and storey drift under three records for both EBF and EBF equipped with friction damper are obtained. The result indicates that FD reduces the response compared to EBF and is more efficient than EBF for taller storey frames.
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