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Yadollah Mansouri,Ali Akbar Zinatizadeh,Parviz Mohammadi,Mohsen Irandoust,Aazam Akhbari,Reza Davoodi 한국화학공학회 2012 Korean Journal of Chemical Engineering Vol.29 No.7
The hydraulic characteristic of an anaerobic rotating biological contactor (AnRBC) were studied by changing two important hydraulic factors effective in the treatment performance: the hydraulic retention time (τ) and rotational disk velocity (ω). The reactor hydraulic performance was analyzed by studying hydraulic residence time distributions (RTD) obtained from tracer (Rhodamine B) experiments. The experiments were conducted based on a central composite face-centered design (CCFD) and analyzed using response surface methodology (RSM). The region of exploration for the process was taken as the area enclosed by τ (60, 90 and 120 min) and ω (0.8 and 16 rpm) boundaries. Four dependent parameters, deviation from ideal retention time (Δτ), dead volume percentage and dispersion indexes (Morrill dispersion index (MDI) and dispersion number (d)), were computed as response. The maximum modeled Δτand dead volume percentage was 43.03 min and 37.51% at τ and ω 120 min and 0 rpm, respectively. While, the minimum predicted responses (2.57 min and 8.08%) were obtained at τ and ω 60min and 16 rpm, respectively. The interaction showed that disk rotational velocity and hydraulic retention time played an important role in MDI in the reactor. The AnRBC hydraulic regime was classified as moderate and high dispersion (d=0.09 to 0.253). As a result, in addition to the factors studied, the reactor geometry showed significant effect on the hydraulic regime.
Enhancement of electronic protection to reduce e-waste
Yadollah Abdollahi,Suhana Binti Mohd Said,Nor Asrina Sairi,Mohd Faizul Bin Mohd Sabri,Azmi Zakaria,Ebrahim Abouzari-lotf,Masoumeh Dorraj,Raba’ah Syahidah Aziz 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.29 No.-
The electronic devices turn to e-waste due to their insufficient electrical protection which is provided bya ceramic core varistor. The ceramic consists of the surrounded ZnO grains of melted an additives layer. The layer is origin of the quality of the protection. To enhance the quality and consequently prevent ewaste,the fabrication of the varistor was modeled by artificial neural network. The model predicted theoptimized condition that was experimentally fabricated and electrically characterized. The resultsconfirmed the model predictability. In conclusion, the optimization which has industrial scales uppotential warranties the electronic protection that controls the global e-waste.
Yadollah Bayat,Mohammad Mahdi Ahari Mostafavi 대한화학회 2012 Bulletin of the Korean Chemical Society Vol.33 No.11
1,5-Diacetyl-3,7-dinitro-l,3,5,7-tetraazacyclooctane (DADN) is a key intermediate in the preparation of octahydro- 1,3,5,7-tetranitro-1,3,5,7-tetrazocine (HMX), one of the most powerful high-melting explosives. The present investigation focuses on nitrolysis of DADN to HMX by developing a new nitrolysis process involving the use of nitric acid catalyzed by Silica Sulfuric Acid (SSA). In order to optimize the process parameters for synthesis of HMX to obtain higher yield and purity, a study was carried out with variation of some parametric conditions like time, mole ratio of SSA and nitric. This method gave us green and mild conditions for nitration reaction.
Application of ANFIS technique on performance of C and L shaped angle shear connectors
Yadollah Sedghi,Yousef Zandi,Mahdi Shariati,Ebrahim Ahmadi,Vahid Moghimi Azar,Ali Toghroli,Maryam Safa,Edy Tonnizam Mohamad,Majid Khorami,Karzan Wakil 국제구조공학회 2018 Smart Structures and Systems, An International Jou Vol.22 No.3
The behavior of concrete slabs in composite beam with C and L shaped angle shear connectors has been studied in this paper. These two types of angle shear connectors' instalment have been commonly utilized. In this study, the finite element (FE) analysis and soft computing method have been used both to present the shear connectors' push out tests and providing data results used later in soft computing method. The current study has been performed to present the aforementioned shear connectors' behavior based on the variable factors aiming the study of diverse factors' effects on C and L shaped angle in shear connectors. ANFIS (Adaptive Neuro Fuzzy Inference System), has been manipulated in providing the effective parameters in shear strength forecasting by providing input-data comprising: height, length, thickness of shear connectors together with concrete strength and the respective slip of shear connectors. ANFIS has been also used to identify the predominant parameters influencing the shear strength forecast in C and L formed angle shear connectors.
Fabrication modeling of industrial CO2 ionic liquids absorber by artificial neural networks
Yadollah Abdollahi,Nor Asrina Sairi,Mohamed Khereddine Aroua,Hamid Reza Fard Masoumi,Hossein Jahangirian,Yatimah Alias 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.25 No.-
The fabrication of industrial CO2 blended solution absorber was modeled by artificial neutral network. First the generated model had been statistically evaluated and then its ability of prediction was confirmed by validation test. The validated model was used to predict the desirable density and relative importance of the fabrication’s effective variables. In conclusion, the importance included x[H2O], 36.18%, x[gua], 25.37%, x[MDEA], 25.34% and temperature, 13.11% which showed none of them is negligible as well as the density (g cm3) was validated by further experiment that showed the actual density, 1.101, was quite close to the predicted value, 1.017.
Effect of the P/Al ratio on the performance of modified HZSM-5 for methanol dehydration reaction
Yadollah Tavan,Mohammad Reza Khosravi Nikou,Ahmad Shariati 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.2
The precipitation method was used to modify HZSM-5 by coating it with aluminophosphate at P/Almolar ratios of 0.3, 0.8, 1.2 and 1.5. These catalysts were characterized by XRD, NH3-TPD, BET, FT-IR, ICPTEOSand SEM and evaluated as catalysts for the methanol dehydration reaction. The ZALPO0.8 catalystachieved 86% conversion which was the highest conversion till 315 ℃. It was found that primary benefitsof AlPO modification were that it tended to retard the activity of the highly active acid sites whichpromote dimethyl ether decomposition and led to decrease in the apparent activation energy.
Bayat, Yadollah,Mostafavi, Mohammad Mahdi Ahari Korean Chemical Society 2012 Bulletin of the Korean Chemical Society Vol.33 No.11
1,5-Diacetyl-3,7-dinitro-l,3,5,7-tetraazacyclooctane (DADN) is a key intermediate in the preparation of octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine (HMX), one of the most powerful high-melting explosives. The present investigation focuses on nitrolysis of DADN to HMX by developing a new nitrolysis process involving the use of nitric acid catalyzed by Silica Sulfuric Acid (SSA). In order to optimize the process parameters for synthesis of HMX to obtain higher yield and purity, a study was carried out with variation of some parametric conditions like time, mole ratio of SSA and nitric. This method gave us green and mild conditions for nitration reaction.
Application of ANFIS technique on performance of C and L shaped angle shear connectors
Sedghi, Yadollah,Zandi, Yousef,Shariati, Mahdi,Ahmadi, Ebrahim,Azar, Vahid Moghimi,Toghroli, Ali,Safa, Maryam,Mohamad, Edy Tonnizam,Khorami, Majid,Wakil, Karzan Techno-Press 2018 Smart Structures and Systems, An International Jou Vol.22 No.3
The behavior of concrete slabs in composite beam with C and L shaped angle shear connectors has been studied in this paper. These two types of angle shear connectors' instalment have been commonly utilized. In this study, the finite element (FE) analysis and soft computing method have been used both to present the shear connectors' push out tests and providing data results used later in soft computing method. The current study has been performed to present the aforementioned shear connectors' behavior based on the variable factors aiming the study of diverse factors' effects on C and L shaped angle in shear connectors. ANFIS (Adaptive Neuro Fuzzy Inference System), has been manipulated in providing the effective parameters in shear strength forecasting by providing input-data comprising: height, length, thickness of shear connectors together with concrete strength and the respective slip of shear connectors. ANFIS has been also used to identify the predominant parameters influencing the shear strength forecast in C and L formed angle shear connectors.
Optimization of shear connectors with high strength nano concrete using soft computing techniques
Sedghi, Yadollah,Zandi, Yosef,Paknahad, Masoud,Assilzadeh, Hamid,Khadimallah, Mohamed Amine Techno-Press 2021 Advances in nano research Vol.11 No.6
This paper conducted mainly for forecasting the behavior of the shear connectors in steel-concrete composite beams based on the different factors. The main goal was to analyze the influence of variable parameters on the shear strength of C-shaped and L-shaped angle shear connectors. The method of ANFIS (adaptive neuro fuzzy inference system) was applied to the data in order to select the most influential factors for the mentioned shear strength forecasting. Five inputs are considered: height, length, thickness of shear connectors together with concrete strength and respective slip of the shear connectors after testing. The ANFIS process for variable selection was also implemented in order to detect the predominant factors affecting the forecasting of the shear strength of C-shaped and L-shaped angle shear connectors. The results show that the forecasting methodology developed in this research is useful for enhancing the multiple performances characterizing in the shear strength prediction of C and L shaped angle shear connectors analyzing.
Akbar Zamaniyan,Yadollah Mortazavi,Hossein Manafi,Abbas Ali Khodadadi 한국공업화학회 2011 Journal of Industrial and Engineering Chemistry Vol.17 No.4
A novel catalyst shape for reforming reaction, as an intraparticle diffusion limited-reaction, using bulk monolithic catalyst (BMC), the so-called tube fitted bulk monolithic catalyst (TFBMC), instead of conventional pellets is presented. A detailed analysis of the transport phenomena and proper models are introduced. The model is applied for natural gas reforming reaction and validated using industrial data. Then comparative model analysis and comparison for packed bed rector using conventional pellet shapes and TFBMC is presented. The results indicate that the TFBMC has superior advantages over the conventional pellet shapes especially with regards to the pressure drop and effective usage of the catalyst. Thus, TFBMC offer smaller reactor volume for processing similar feed flow which in turn results in less capital cost and also energy saving in the course of operation. Moreover, the TFBMC concept may be easily adapted to the present fixed bed reactors which use conventional pellet catalysts resulting more productivity and better performance.