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Zamani, Mahdi,Maghrebi, Mohammad Javad,Moshizi, Sajad A. Techno-Press 2016 Wind and Structures, An International Journal (WAS Vol.22 No.5
Providing high starting torque and efficiency simultaneously is a significant challenge for vertical axis wind turbines (VAWTs). In this paper, a new approach is studied in order to modify VAWTs performance and cogging torque. In this approach, J-shaped profiles are exploited in the structure of blades by means of eliminating the pressure side of airfoil from the maximum thickness toward the trailing edge. This new profile is a new type of VAWT airfoil using the lift and drag forces, thereby yielding a better performance at low TSRs. To simulate the fluid flow of the VAWT along with J-shaped profiles originated from NACA0018 and NACA0030, a two-dimensional computational analysis is conducted. The Reynolds Averaged Navier-Stokes (RANS) equations are closed using the two-equation Shear Stress Transport (SST) turbulence model. The main objective of the study is to investigate the effects of J-shaped straight blade thickness on the performance characteristics of VAWT. The results obtained indicate that opting for the higher thickness in J-shaped profiles for the blade sections leads the performance and cogging torque of VAWT to enhance dramatically.
High repetition rate laser ablation for vaporeliquidesolid nanowire growth
A. Marcu,F. Stokker,R.R. Zamani,C.P. Lungu,C. Grigoriu 한국물리학회 2014 Current Applied Physics Vol.14 No.4
A high repetition rate (500 kHz) solid state laser was used for the ablation process in a Pulsed Laser Deposition (PLD)/VaporeLiquideSolid (VLS) growing. A ZnO target was ablated with laser powers between 0.6 Wand 1.2 W, and a variable number of pulses per train and trains frequencies. ZnO structures were grown on gold patterned and unpatterned substrates surfaces. Enhanced growth of the nanostructures could be noticed on the catalyst patterned surfaces. Better nanowire morphologies were also observed for bigger number of laser pulses per train. The enhancements are more evident for low laser powers. Based on plume expansion investigations, by using a high speed camera and a Particle-In-Cell (PIC) Monte-Carlo based simulations, the nanostructure morphology variations could be understood on the basis of the plume particles diffusion process and thin film versus VLS growing competition.
Mahdi Zamani,Mohammad Javad Maghrebi,Sajad A. Moshizi 한국풍공학회 2016 Wind and Structures, An International Journal (WAS Vol.22 No.5
Providing high starting torque and efficiency simultaneously is a significant challenge for vertical axis wind turbines (VAWTs). In this paper, a new approach is studied in order to modify VAWTs performance and cogging torque. In this approach, J-shaped profiles are exploited in the structure of blades by means of eliminating the pressure side of airfoil from the maximum thickness toward the trailing edge. This new profile is a new type of VAWT airfoil using the lift and drag forces, thereby yielding a better performance at low TSRs. To simulate the fluid flow of the VAWT along with J-shaped profiles originated from NACA0018 and NACA0030, a two-dimensional computational analysis is conducted. The Reynolds Averaged Navier-Stokes (RANS) equations are closed using the two-equation Shear Stress Transport (SST) turbulence model. The main objective of the study is to investigate the effects of J-shaped straight blade thickness on the performance characteristics of VAWT. The results obtained indicate that opting for the higher thickness in J-shaped profiles for the blade sections leads the performance and cogging torque of VAWT to enhance dramatically.
Dynamics and Stable Gait Planning of a Quadruped Robot
Ali Zamani,Mahdi Khorram,S. Ali A. Moosavian 제어로봇시스템학회 2011 제어로봇시스템학회 국제학술대회 논문집 Vol.2011 No.10
In this paper, dynamics and gait planning of a quadruped robot is discussed. To this end, using Lagrangian method the equations of motion are first derived. Then, an approach is proposed to eliminate the terms corresponding to the constraints caused by the feet on the ground. The obtained dynamics model is validated using Matlab SimMechanics. Finally, gait planning of the robot is developed such that the robot can walk with a given speed over a flat terrain while the robot center of mass remains inside the support polygon. Obtained results reveal stable walking of a quadruped robot based on the proposed approach.
Razzaghi, A.,Aliarabi, H.,Tabatabaei, M.M.,Saki, A.A.,Valizadeh, R.,Zamani, P. Asian Australasian Association of Animal Productio 2012 Animal Bioscience Vol.25 No.4
Twenty four periparturient cows were used to determine the effects of DCAD on acid-base balance, plasma and urine mineral concentrations, health status, and subsequent lactation performance. Each group of 12 cows received either a diet containing -100 DCAD or +100 DCAD for 21 d prepartum. Both anionic and cationic groups were divided into two groups, one received a +200 DCAD and the other +400 DCAD diet for 60 d postpartum. Prepartum reduction of DCAD decreased DMI, urinary and blood pH, urinary concentrations of Na or K and increased plasma and urinary Ca, Mg, Cl and S. Also cows fed -100 DCAD diet consumed the most dry matter in the first 60 d after calving. Postpartum +400 DCAD increased milk fat and total solid percentages, urinary and blood pH and urinary Na and K concentrations, but urinary Ca, P, Cl and S contents decreased. Greater DMI, FCM yields were observed in cows fed a diet of +400 DCAD than +200 DCAD. No case of milk fever occurred for any diets but feeding with a negative DCAD diet reduced placenta expulsion time. In conclusion, feeding negative DCAD in late gestation period and high DCAD in early lactation improves performance and productivity of dairy cows.
Zamany, A. J.,Samadi, G. R.,Kim, D. H.,Keum, Y. S.,Saini, R. K. Springer Science + Business Media 2017 Journal of the American Oil Chemists' Society Vol.94 No.6
<P>Afghanistan is the fourth largest producer of almonds in the world producing 78 native and 6 imported cultivars. However, till date, there have been no comprehensive data on nutrient profiles of the native cultivars. Thus, in the present investigation, tocopherol contents and fatty acid composition from the kernels of 20 selected native almond cultivars of Afghanistan were analyzed. The ranges of variability for the studied nutrients were similar to those already reported for almonds grown in other countries, such as 47.8-66.1% of total lipids (fresh weight basis), 62.54-81.57% of oleic acid in the total lipids, and 139.1-355.0 mu g/g alpha-tocopherol in kernels. With respect to cultivars, significantly (p < 0.05) high content of total lipids were recorded in 'Belabai' and 'Sattarbai' (Afghan grade), oleic acid in 'Khairodini' and of alpha-tocopherol in 'Khairodini-161 Samangan' and 'Belabai' cultivars. Kernels from these cultivars can be used for nutrient dense food formulations. Daily consumption of 50 g almonds is sufficient to meet the RDA of alpha-tocopherol (15 mg/day), considering the average 300 mu g/g of alpha-tocopherol in Afghan almonds. Also, these nutrient rich cultivars can be used in almond breeding programs globally, to focus on improving kernel oil composition and nutrient contents.</P>
Optimization of CO2 methanation reaction over M*/Mn/Cu–Al2O3 (M*: Pd, Rh and Ru) catalysts
A.H. Zamani,W.A.W. Abu Bakar,R. Ali 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.29 No.-
The catalytic activity of CO2 methanation with H2 over M*/Mn/Cu–Al2O3 (M* = Pd, Rh and Ru) oxidecatalysts in simulated natural gas was investigated. Among them, Ru/Mn/Cu–Al2O3 catalyst was found tobe the most promising catalyst. Response surface methodology involving central composite design wasemployed and Ru loading was found to be the most significant effective factor, followed by calcinationtemperature and catalyst loading. The optimum condition for CO2 conversion was at 10.9 wt.% Ruloading, calcination temperature of 1035 8C and catalyst loading of 5 wt.g. Interestingly, the RMC10catalyst demonstrated good activity, stability and robustness during entire testing period which issuitable for industrial application.
M. A. Boorboor Ajdari,S. Jalili,M. Jafari,J. Zamani,M. Shariyat 대한기계학회 2012 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.26 No.9
The objective of this research is determining the buckling load of composite truncated conical shells under external loading by theoretical and numerical methods. The boundary conditions are assumed to be clamped. At first, basic equations and stability relations of conical shells were derived. The analysis is carried out using Donnel-type stability equations for thin cross-ply conical shells. By applying Galerkin’s method, these equations are converted to a system of ordinary time dependent differential equations. Ritz method is employed for finding the dynamic stability load. Finally, the critical static and dynamic buckling loads and the corresponding wave numbers have been found analytically. Then comparison of results is considered. Results of analytical calculations are compared with numerical results and with other researchers’ analytical results. The effects of geometric parameters, the cone semi-vertex angle, number of layers and material of fibers on buckling loads are discussed.
N. Zamani,H.R. Rajabi,M. Taghdiri,A. Sohyl Fakhaei,V. Vatanpour 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.1
This work reports adsorption and catalytic oxidation process for degradation of hexamine (HMT)-containing industrial wastewater based on the reduction in total organic carbon. The studied systemsinclude hydrogen peroxide, MCM-41, phosphotungstic acid (PTA)/MCM-41 embedded via impregnationmethod, PTA/H2O2 and PTA/MCM-41 embedded via impregnation or direct synthesis methods in thepresence of hydrogen peroxide. The TOC results indicated that the system including PTA embeddedwithin MCM-41 via direct synthetic method in the presence of H2O2 has a higher performance fordegradation of HMT-containing wastewater. The total organic carbon for the mineralization of HMT wasobtained to be 57%, under optimum conditions.