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Parisa Shafiee Seyed Mehdi Alavi Mehran Rezaei 《International Journal of Hydrogen Energy》2021,46(5):3933-3944
In this study, a simple solid-state synthesis method was employed for the preparation of the Ni–Co–Al2O3 catalysts with various Co loadings, and the prepared catalysts were used in CO2 methanation reaction. The results demonstrated that the incorporation of cobalt in nickel-based catalysts enhanced the activity of the catalyst. The results showed that the 15 wt%Ni-12.5 wt%Co–Al2O3 sample with a specific surface area of 129.96 m2/g possessed the highest catalytic performance in CO2 methanation (76.2% CO2 conversion and 96.39% CH4 selectivity at 400 °C) and this catalyst presented high stability over 10 h time-on-stream. Also, CO methanation was investigated and the results showed a complete CO conversion at 300 °C. 相似文献
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Shafiee Ahad Nili-Ahmadabadi Mahmoud Kim Hyoung Seop Jahazi Mohammad 《Metals and Materials International》2020,26(5):591-602
Metals and Materials International - In this study, a newly developed γ′ precipitation hardened high entropy superalloy (designated as HES-A1 hereafter) was produced and its... 相似文献
84.
Bio‐Inspired Cryo‐Ink Preserves Red Blood Cell Phenotype and Function During Nanoliter Vitrification 下载免费PDF全文
Rami El Assal Sinan Guven Umut Atakan Gurkan Irep Gozen Hadi Shafiee Sedef Dalbeyler Noor Abdalla Gawain Thomas Wendy Fuld Ben M. W. Illigens Jessica Estanislau Joseph Khoory Richard Kaufman Claudia Zylberberg Neal Lindeman Qi Wen Ionita Ghiran Utkan Demirci 《Advanced materials (Deerfield Beach, Fla.)》2014,26(33):5815-5822
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Motahareh Mozaffari Naiini Mahdi Shafiee Afarani 《Particulate Science and Technology》2015,33(5):456-462
Hollow tadpole-like silica particles were successfully synthesized via the microemulsion synthesis method using polyvinylpyrrolidone (PVP), tetraethyl orthosilicate (TEOS), and sodium citrate as starting materials in the presence of isopropanol as a solvent. The effects of TEOS/ammonia (T/A) ratio, PVP molecular weight, synthesis temperature, and sodium citrate concentration on the morphology of particles were investigated. The results demonstrated that synthesis temperature has a vital effect on the morphology of particles. Also, microstructure analysis showed that the length of the silica rods was tunable in the range 1.2–5.2 µm. Control of the length was obtained by adjusting the synthesis temperature and PVP molecular weight. The transmission electron microscopy results clearly confirmed that the tadpole-like particles were surprisingly hollow and they provided an open side that was completely different from the previous reports. The inner diameter of the silica rods could be adjusted in the range 50–200 nm. The existence of such a considerable open side may be practically appreciated in many potential applications such as bio-immobilization. 相似文献
86.
M. Ehsan Shafiee Emily Zechman Berglund Michael K. Lindell 《Water Resources Management》2018,32(6):2033-2059
In the event that pathogens or toxins are introduced to a water distribution system, a utility manager may identify a threat through water quality data or alerts from public health officials. The utility manager may issue water advisories to warn consumers to reduce water use activities. As consumers react and change water demands, dynamic feedbacks among the community, utility managers, and the engineering infrastructure can create unexpected public health consequences and network hydraulics. A Complex Adaptive System (CAS)-based methodology is developed to couple an engineering model of a water distribution system with agent-based models (ABM) of consumers, public health officials, and utility managers to simulate feedback among management decisions, system hydraulics, and public behavior. A utility manager and a public health official are represented as agents, who respond to the event using a set of rules and equations that are based on a statistical analysis of a set of recorded water events. Consumers are represented as agents who update their water activities based on exposure to the contaminant and warnings from a utility agent and family members. A model of consumer compliance is developed using results from two surveys that report data to characterize consumer perceptions toward information sources during a water contamination event. The ABM framework is applied for an illustrative mid-sized virtual city to quantify the significance of interactions and advisories on public health consequences. 相似文献
87.
In this work, the problem of stability analysis for a class of singular hybrid switched and impulsive system (HSIS) is addressed. Corresponding to each subsystem, a hybrid switched and impulsive controller is designed and then the exponential stability property of the proposed singular HSIS is discussed for linear and nonlinear cases. Because switched systems without impulses are a special case of HSISs, the results are also given to switched system with synchronous and asynchronous controllers. The obtained results apply to control singular systems, and the introduced theorems allow knowing how the control must be designed. Two numerical examples are given to show the effectiveness of the proposed approaches. At first, by using MATLAB® software, the proposed method is applied to a class of physiological processes of endocrine disruptor diethylstilbestrol models to illustrate the effectiveness of the results obtained here for the linear case. Thereafter, another numerical example is provided to support the presented theoretical results for the nonlinear case. 相似文献
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In the present investigation, solution casting method was used for the preparation of nanocomposite (NC) films. At first, the surface of ZrO2 nanoparticles (NPs) was modified with vitamin B1 (VB1) as a bioactive coupling agent to achieve a better dispersion and compatibility of NPs within the poly(vinyl chloride) (PVC) matrix. The grafting of modifier on the surface of ZrO2 was confirmed by Fourier transform infrared spectroscopy and thermogravimetric analysis (TGA). Finally, the resulting modified ZrO2 (ZrO2–VB1), was used as a nano-filler and incorporated into the PVC matrix to improve its mechanical and thermal properties. These processes were carried out under ultrasonic irradiation conditions, which is an economical and eco-friendly method. The effect of ZrO2–VB1 on the properties and morphology of the PVC matrix was characterized by various techniques. Field emission scanning electron microscopy and transmission electron microscopy analyses showed a good dispersion of fillers into the PVC matrix with the average diameter of 37–40 nm. UV–Vis spectroscopy was used to study optical behavior of the obtained NC films. TGA analysis has con?rmed the presence of about 7 wt% VB1 on the surface of ZrO2. Also, the data indicated that the thermal and mechanical properties of the NC films were enhanced. 相似文献
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Mohammad Soodbakhsh Taleghani Mohammad Ebrahim Shafiee 《Petroleum Science and Technology》2017,35(3):235-241
Asphaltene precipitation is introduced as a seriously problematic issue in the petroleum reservoirs that causes filling porosity of rocks and reduction of oil production. Hence, estimating the amount of precipitated asphaltene has huge importance in preventing the deposition of asphaltene. The present study was done to estimate the precipitated asphaltene as a function of temperature, dilution ratio, and molecular weight of different n-alkanes using adaptive neuro-fuzzy inference system (ANFIS). Moreover, another new scaling model was also developed to compare with the ANFIS model. In addition, these two developed models have been compared with previously developed correlations. The obtained values of R2 for the ANFIS and scaling models were 0.9912 and 0.9862, respectively. These tools are simple to use and can be used as an accurate approximation of the precipitated asphaltene as a function of temperature, dilution ratio, and molecular weight of different n-alkanes. 相似文献
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Fatemeh Paborji Mahdi Shafiee Afarani Amir Masoud Arabi Mehdi Ghahari 《International Journal of Applied Ceramic Technology》2022,19(5):2406-2418
Solution combustion synthesis of iron chromite was reported using iron(III) nitrate nonahydrate and chromium(III) nitrate nonahydrate as starting materials, as well as glycine, urea, citric acid, and ethylene glycol as fuels. The influence of fuel type on the structure, molecular, microstructure as well as chromatic properties of samples was investigated. The X-ray diffraction (XRD) patterns showed that unlike themodynamical prediction, glycine fuel led to strongest combustion and consequent highest XRD peak intensities and lower lattice parameters. Moreover, the change of fuel type and mixing of fuels affected XRD data. Fourier transform infrared analysis showed that the band position of Cr–O and Fe–O bonds were shifted to higher frequencies by using of fuels with weaker combustion reactions. In addition, scanning electron micrographs showed that different morphologies of FeCr2O4 particles were obtained depending on the fuel type and ratios. Energy-dispersive X-ray spectroscopy analysis of the samples showed that oxygen concentration of samples was less than that of stoichiometric ratio of FeCr2O4 due to local reducing atmosphere. Furthermore, chromatic properties of the powders showed that the pigment synthesized with glycine fuel has a better and lighter grayish brown color than the other ones and can be used as a suitable industrial candidate to create a brown color in the ceramic glaze. 相似文献