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Nonlinear dynamic analysis of SWNTs conveying fluid using nonlocal continuum theory
Seyed Ali Hosseini Kordkheili,Taha Mousavi,Hamid Bahai 국제구조공학회 2018 Structural Engineering and Mechanics, An Int'l Jou Vol.66 No.5
By employing the nonlocal continuum field theory of Eringen and Von Karman nonlinear strains, this paper presents an analytical model for linear and nonlinear dynamics analysis of single-walled carbon nanotubes (SWNTs) conveying fluid with different boundary conditions. In the linear analysis the natural frequencies and critical flow velocities of SWNTs are computed. However, in the nonlinear analysis the effect of nonlocal parameter on nonlinear dynamics of cantilevered SWNTs conveying fluid is investigated by using bifurcation diagram, phase plane and Poincare map. Numerical results confirm existence of chaos as well as a period-doubling transition to chaos.
Adsorption of Cu(II) to mGO@Urea and its application for the catalytic reduction of 4-NP
Seyed Ali Hosseini,Zahra Shokri,Shiva Karami 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.75 No.-
mGO@Urea was successfully fabricated and examined for Cu2+ adsorption from aqueous solutions. mGO@Urea was characterized by XRD, FT-IR, SEM, EDX and VSM. Furthermore, the effects of some factorssuch as pH, adsorbent type, Cu2+ concentration, adsorbent amount and time on adsorption capacity werestudied. The isotherm analysis indicates that the sorption data were expressed by Langmuir isothermmodel better than Freundlich and the adsorption kinetics was followed from the pseudo-second-orderequation. After the adsorption process, the adsorbent could be effortlessly magnetically separated. Also,the catalytic performance of the mGO@Urea@Cu was evaluated for the reduction of p-nitrophenol withNaBH4.
Seyed Ali Hosseini,Aligholi Niaei,Dariush Salari,Samira Arefi Oskoui 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.6
The correlation between physical–chemical properties and activities of LaB0.5Co0.5O3 (B = Cr, Mn, Cu)nano perovskites was studied in combustion of toluene. LaMn0.5Co0.5O3 showed the highest activity among LaB0.5Co0.5O3 catalysts and further optimization study was focused on LaMnxCo1-xO3 (x = 0.1,0.25, 0.5). The activity and reducibility of catalysts improved due to partial substitution of Co3+ by B cation. No direct relationship was between surface area and catalyst activity. T50% of 2-propanol over LaMn0.25Co0.75O3, LaMn0.5Co0.5O3, LaMn0.1Co0.9O3 and LaCoO3 was 168, 200, 220 and 229 8C,respectively. LaMn0.25Co0.75O3 was the optimum catalyst and showed robust stability in combustion of toluene and 2-propanol.
Hosseini, Seyed Ali,Niaei, Aligholi,Salari, Dariush,Jodaei, Azadeh Korean Chemical Society 2010 Bulletin of the Korean Chemical Society Vol.31 No.4
Activities of nanostructure HZSM-5 and Co-ZSM-5 catalysts (with different Co-loading) for catalytic conversion of ethyl acetate and toluene were studied. The catalysts were prepared by wet impregnation method and were characterized by XRD, BET, SEM, TEM and ICP-AES techniques. Catalytic studies were carried out inside a U-shaped fixed bed reactor under atmospheric pressure and different temperatures. Toluene showed lower reactivity than ethyl acetate for conversion on Co-ZSM-5 catalysts. The effect of Co loading on conversion was prominent at temperatures below $400^{\circ}C$ and $450^{\circ}C$ for ethyl acetate and toluene respectively. In a binary mixture of organic compounds, toluene and ethyl acetate showed an inhibition and promotional behaviors respectively, in which the conversion of toluene was decreased at temperatures above $350^{\circ}C$. Inhibition effect of water vapor was negligible at temperatures above $400^{\circ}C$. An artificial neural networks model was developed to predict the conversion efficiency of ethyl acetate on Co-ZSM-5 catalysts based on experimental data. Predicted results showed a good agreement with experimental results. ANN modeling predicted the order of studied variable effects on ethyl acetate conversion, which was as follows: reaction temperature (50%) > ethyl acetate inlet concentration (25.085%) > content of Co loading (24.915%).
Seyed Ali Hosseini,Aligholi Niaei,Dariush Salari,Azadeh Jodaei 대한화학회 2010 Bulletin of the Korean Chemical Society Vol.31 No.4
Activities of nanostructure HZSM-5 and Co-ZSM-5 catalysts (with different Co-loading) for catalytic conversion of ethyl acetate and toluene were studied. The catalysts were prepared by wet impregnation method and were characterized by XRD, BET, SEM, TEM and ICP-AES techniques. Catalytic studies were carried out inside a U-shaped fixed bed reactor under atmospheric pressure and different temperatures. Toluene showed lower reactivity than ethyl acetate for conversion on Co-ZSM-5 catalysts. The effect of Co loading on conversion was prominent at temperatures below 400℃ and 450℃ for ethyl acetate and toluene respectively. In a binary mixture of organic compounds, toluene and ethyl acetate showed an inhibition and promotional behaviors respectively, in which the conversion of toluene was decreased at temperatures above 350℃. Inhibition effect of water vapor was negligible at temperatures above 400℃. An artificial neural networks model was developed to predict the conversion efficiency of ethyl acetate on Co-ZSM-5catalysts based on experimental data. Predicted results showed a good agreement with experimental results. ANN modeling predicted the order of studied variable effects on ethyl acetate conversion, which was as follows: reaction temperature (50%) > ethyl acetate inlet concentration (25.085%) > content of Co loading (24.915%).
Seyed Mohsen Hosseini,Mohsen Danesh Mesgaran,Ali Reza Vakili,Abbas Ali Naserian,Ehsan Khafipour 아세아·태평양축산학회 2019 Animal Bioscience Vol.32 No.3
Objective: We hypothesized that silage additives may alter the undigested neutral detergent fiber (uNDF) content through ensiling. Therefore, urea and formic acid were applied to corn, whole barley crop (WBC) and alfalfa to change uNDF content of the ensiled forages. Methods: Six experimental diets at two groups of high uNDF (untreated corn and alfalfa silages [CSAS] and untreated whole barley and alfalfa silages [BSAS]) and low uNDF (urea-treated corn silage+untreated alfalfa silage [CSUAS], urea-treated whole barley silage+untreated alfalfa silage [BSUAS], untreated corn silage+formic acid-treated alfalfa silage [CSASF], and untreated whole barley silage+formic acid-treated alfalfa silage [BSASF]), were allocated to thirty-six multiparous lactating Holstein dairy cows. Results: The untreated silages were higher in uNDF than additive treated silages, but the uNDF concentrations among silages were variable (corn silage<barley silage<alfalfa silage). Dry matter intake was not influenced by the reduction of uNDF or physical NDF supply source from corn to WBC silages (p>0.05). Milk yield tended to increase in the cows fed high uNDF diets than those fed low uNDF (p = 0.10). The cows fed diet based on urea-treated corn silage had higher milk yield than those fed other silages (p = 0.05). The substitution of corn silage with the WBC silage tended to decrease milk production (p = 0.07). Changing the physical source of NDF supply and the uNDF content from the corn silage to the WBC silage caused a significant increase in ruminal NH3-N concentration, milk urea-N and fat yield (p< 0.05). The cows fed diets based on WBC silage experienced greater rumination time than the cows fed corn silage (p<0.05). Conclusion: Administering additives to silages to reduce uNDF may improve the performance of Holstein dairy cows.
Seyed Ali Hosseini,Aligholi Niaei,Dariush Salari,Raimundo K. Vieira,Shamil Sadigov,Seyed Reza Nabavi 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.1
Optimization of 2-propanol oxidation over CuMnmCo2-mO4 nanospinels was carried out by a split design method. 15-term model was proposed to fit the experimental data. The model revealed that both whole plot and subplot variables have significant effects on conversion of 2-propanol. The model predicted the interaction of subplot and whole plot variables as well as their importance. The maximum conversion of 2-propanol was observed over CuMn2O4 (x1 = 0.33, x2 = 0, x3 = 0.67) at calcination and reaction temperatures of 800 8C (z1 = 1) and 300 8C (z2 = 1), respectively. The predicted response and the response obtained from experiment for optimum conditions were 93.36 and 96, respectively.
Nonlinear dynamic analysis of SWNTs conveying fluid using nonlocal continuum theory
Kordkheili, Seyed Ali Hosseini,Mousavi, Taha,Bahai, Hamid Techno-Press 2018 Structural Engineering and Mechanics, An Int'l Jou Vol.66 No.5
By employing the nonlocal continuum field theory of Eringen and Von Karman nonlinear strains, this paper presents an analytical model for linear and nonlinear dynamics analysis of single-walled carbon nanotubes (SWNTs) conveying fluid with different boundary conditions. In the linear analysis the natural frequencies and critical flow velocities of SWNTs are computed. However, in the nonlinear analysis the effect of nonlocal parameter on nonlinear dynamics of cantilevered SWNTs conveying fluid is investigated by using bifurcation diagram, phase plane and Poincare map. Numerical results confirm existence of chaos as well as a period-doubling transition to chaos.
Hashemi, Seyed Hossein,Dehghani, Seyed Ali Mousavi,Khodadadi, Abdolhamid,Dinmohammad, Mahmood,Hosseini, Seyed Mohsen,Hashemi, Seyed Abdolrasoul The Korean Institute of Chemical Engineers 2017 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.55 No.5
In the present research, in order to predict activity coefficient of inorganic ions in electrolyte solution of a petroleum system, we studied 13 components in the electrolyte solution, including $H_2O$, $CO_2$ (aq), $H^+$, $Na^+$, $Ba^{2+}$, $Ca^{2+}$, $Sr^{2+}$, $Mg^{2+}$, $SO_4$, $CO_3$, $OH^-$, $Cl^-$, and $HCO_3$. To predict the activity coefficient of the components of the petroleum system (a solid/liquid equilibrium system), activity coefficient model of Extended UNIQUAC was studied, along with its adjustable parameters optimized based on a genetic algorithm. The total calculated error associated with optimizing the adjustable parameters of Extended UNIQUAC model considering the 13 components under study at three temperature levels (298.15, 323.15, and 373.15 K) using the genetic algorithm is found to be 0.07.
Seyed Hamzeh Hosseini,Hossein Azarnivand,Mahdi Ayyari,Mohammad Ali Zare Chahooki,Reza Erfanzadeh,Sonia Piacente,Reza Kheirandish 한국생태학회 2018 Journal of Ecology and Environment Vol.42 No.4
Background: Predicting the potential habitat of plants in arid regions, especially for medicinal ones, is very important. Although Pergularia tomentosa is a key species for medicinal purposes, it appears in very low density in the arid rangelands of Iran, needing an urgent ecological attention. In this study, we modeled and predicted the potential habitat of P. tomentosa using maximum entropy, and the effects of environmental factors (geology, geomorphology, altitude, and soil properties) on some characteristics of the species were determined. Results: The results showed that P. tomentosa was absent in igneous formation while it appeared in conglomerate formation. In addition, among geomorphological units, the best quantitative characteristics of P. tomentosa was belonged to the conglomerate formation-small hill area (plant aerial parts = 57.63 and root length = 30.68 cm) with the highest electrical conductivity, silt, and CaCO3 content. Conversely, the species was not found in the mountainous area with igneous formation. Moreover, plant density, length of roots, and aerial parts of the species were negatively correlated with soil sand, while positive correlation was observed with CaCO3, EC, potassium, and silt content. The maximum entropy was found to be a reliable method (ROC = 0.91) for predicting suitable habitats for P. tomentosa. Conclusion: These results suggest that in evaluating the plant’s habitat suitability in arid regions, contrary to the importance of the topography, some environmental variables such as geomorphology and geology can play the main role in rangeland plants’ habitat suitability.