Showing papers by "Iran University of Science and Technology published in 2018"
TL;DR: A brief review on the basis concept of hydrogels, the description about classification, synthesis methods, stimulation situations, relevant mechanisms, and applications is given in this article, where the authors also present a brief review of their work.
333 citations
TL;DR: In this article, a review of catalytic applications of metal-organic frameworks (MOFs) in C-C and C-X (S, N, O) bond formation reactions is presented.
246 citations
TL;DR: This is the first design, preparation, characterization and application of the present nanomaterial and also the first ultrasound-irradiated green oxidation.
242 citations
TL;DR: A stochastic bi-objective optimisation model is developed that utilises a fuzzy c-means clustering method to quantify and assess the sustainability performance of the suppliers and determines outsourcing decisions and resilience strategies that minimise the expected total cost and maximise the overall sustainability performance in disruptions.
Abstract: Resilience to disruptions and sustainability are both of paramount importance to supply chains. However, the interactions between the two have not been thoroughly explored in the academic literatur...
215 citations
TL;DR: In this article, the authors compared the mechanical performance of clayey soil stabilization using volcanic ash (VA) based geopolymer and ordinary Portland cement (OPC) and determined the effects of curing conditions and time.
190 citations
TL;DR: A clean energy source with a relatively low pollution footprint, hydrogen does not exist in nature as a separate element but only in compound forms as mentioned in this paper, and hydrogen is produced in the USA.
Abstract: Hydrogen is a clean energy source with a relatively low pollution footprint. However, hydrogen does not exist in nature as a separate element but only in compound forms. Hydrogen is produced throug...
175 citations
TL;DR: In this article, a review on pyrolysis of microalgae for the generation of bio-fuels is provided, which is considered as sustainable, renewable and effective biomass and bio-Fuels obtained from them are more environment-friendly than fossil fuels.
Abstract: Due to the depletion of fossil fuels and their environmental issues, it is necessary to find energy resources which are renewable. Algal biomass becomes promising feedstock for bio-fuel production. They are considered as sustainable, renewable and effective biomass and bio-fuels obtained from them are more environment-friendly than fossil fuels. The aim of this work is to provide a state of the art review on pyrolysis of microalgae for generation of bio-fuels. Initially, some general aspects of biomass such as microalgae characteristics, different thermochemical processes and advantages of microalgae pyrolysis to produce bio-fuels are discussed. Then, different pyrolysis methods are explained and parameters affecting the process are addressed. Bio-fuels including gaseous, solid and liquid products have been characterized in a separate section. Finally, the technical challenges associated with microalgal pyrolysis commercialization are discussed in the last section of this article.
163 citations
TL;DR: A review of MPPT techniques using of comprehensive and relatively new classification with emphasizing on comparison of methods is presented in this paper, where the MPPT technique is compared from an economical and technical point of view.
Abstract: The energy problem is one of the most important and serious problems that humanity is faced with it and this is while the fossil fuels are running out, so finding new sources of energy is one of the challenges of modern man. Solar energy is an available, newable and almost eternal energy which can be converted directly to electrical energy by photovoltaic (PV) cells. Although the use of sunlight costs nothing but PV cells are relatively expensive so it's necessary to extract maximum power from these cells because of economic reasons. To achieve the maximum power point, there are many techniques and also many review papers but just few papers have compared these techniques from economical and technical point of view. This paper presents a review of MPPT techniques using of comprehensive and relatively new classification with emphasizing on comparison of methods.
150 citations
TL;DR: Two-stage stochastic programming approach is used to minimize the operational cost in microgrid energy management and a scenario reduction method based on mixed-integer linear optimization is obtained.
149 citations
TL;DR: In this paper, the preparation of a new magnetic nanocomposite Fe 3 O 4 -halloysite-SO 3 H with nanotube morphology decorated by the spherical nanoparticles is reported.
148 citations
TL;DR: Different types of aluminum dross, their environmental and health hazards, composition, and production process are described and direct and indirect recycling approaches and recovery strategies are focused on.
TL;DR: A chaotic image encryption algorithm is proposed according to the extended Lu system with coexisting attractors and the performance of the algorithm is numerically analyzed.
Abstract: This paper introduces an extended Lu system with coexisting attractors. The number and stability of equilibria are determined. The coexisting attractors of the system are displayed by the bifurcation diagrams, Lyapunov exponent spectrum, phase portraits. It is shown that the system has a pair of strange attractors, a pair of limit cycles, a pair of point attractors for different initial conditions. The circuit implementation of the chaotic attractor and coexisting attractors of the system are presented. The control problem of the system is studied as well. A controller is designed to stabilize the system to the origin and realize the switching between two chaotic attractors based on the passive control method. Moreover, a chaotic image encryption algorithm is proposed according to the system. The performance of the algorithm is numerically analyzed.
TL;DR: Seasonal comparisons showed significant differences for erythromycin and amoxicillin concentrations in seawater, and spatial variation indicated the role of physicochemical properties on distribution of antibiotics in seaw water and sediments.
TL;DR: In this article, the mechanical properties, formability and forming limit diagrams of the tailor-welded blanks (TWBs) produced by friction stir welding (FSW) were analyzed experimentally.
TL;DR: In this paper, the effects of the number of fins and their length on heat transfer enhancement and entropy generation are scrutinized using a two-phase approach, and results indicate that adding porous fins with a high Darcy number improves heat transfer while fins with low Darcy numbers can weaken the convection and decline Nusselt number.
TL;DR: In this article, the effects of nanofluid concentrations and different cross-sections of tube on thermal performance of horizontal spiral-coil in laminar fluid flow are investigated numerically.
TL;DR: A stochastic robust optimization model is presented for the design of a closed-loop supply chain network that performs resiliently in the face of disruptions.
TL;DR: In this article, the authors proposed an effective method to simplify the FCS-MPC and to reduce its calculation efforts for its application in matrix converter-fed permanent magnet synchronous motors.
Abstract: Finite control set-model predictive control (FCS-MPC) is emerging as an attractive alternative for power converters control. In comparison with the classical linear controllers, FCS-MPC needs a shorter control loop cycle time to achieve the same performance. But, the conventional FCS-MPC involves a large amount of calculation. The calculation efforts increase with the number of switching states of the power converter as well as the control objectives, which is a challenge for its application. This paper proposes an effective method to simplify the FCS-MPC and to reduce its calculation efforts for its application in matrix converter-fed permanent magnet synchronous motors. The experimental results which verify the good performance of the proposed method are presented.
TL;DR: This paper addresses a new industrial hazardous waste location-routing problem by putting emphasis on some new aspects in its formulation such as considering restriction about the incompatibility between some kinds of wastes and incorporating routing decisions into the model.
TL;DR: In this paper, the authors review membrane filtration processes used in the gas and oil production for wastewater treatment, with focus on microfiltration, nanofiltration, ultra-filtration and reverse osmosis.
Abstract: More than 88 billion barrels of wastewater are produced yearly in the world from gas and oil production. Given the rising demand for drinkable water, there is a need for advanced purification processes. Here we review membrane filtration processes used in the gas and oil production for wastewater treatment, with focus on microfiltration, nanofiltration, ultrafiltration, reverse osmosis, forward osmosis, membrane distillation, and electrodialysis.
TL;DR: A hybrid harmony search-simulated annealing method that combines the advantages of each one of the above-mentioned metaheuristic algorithms is proposed that improves the obtained solutions, in terms of quality, compared to the solutions provided by individual harmony search or individual simulated anneals.
TL;DR: In this article, a mixed-integer programming (MILP) model is proposed to determine the strategic and tactical level decisions of lignocellulosic bioethanol supply chain subject to different sources and types of uncertainty.
TL;DR: The results show that with an increase of 2.43% in the economic objective function, a desirable level of environmental and social protection is achieved and the mean value of supply chain performance will enjoy more desirable values if the influence of optimality robustness and feasibility robustness decreases.
TL;DR: In this article, a new nanosword-like (NSs) n-n type II heterojunction with energy band gap of 1.75 ǫeV was prepared by composing n-type VO2 and N-type CuWO4 compounds and subsequently characterized by FT-IR, EDS, XRD, FESEM, UVVis-DRS and PL spectroscopy.
TL;DR: The results show that hybrid optimization techniques provide the best performance among the considered evolutionary algorithms and that using the HRES reduces system costs and increases system reliability in general and for increasing fresh water availability.
TL;DR: In this article, the performance of a new configuration of a Combined Cooling, Heating and Power (CCHP) cycle including a Brayton cycle, a Rankine cycle, an ejector refrigeration cycle, and a domestic water heater is studied by utilization of 4E (energy, exergy, economic and environmental) analysis.
TL;DR: A polarization-insensitive terahertz absorber based on multilayer graphene-based metasurfaces (MGBMs) is systematically designed, providing an extremely broad absorption bandwidth (BW), indicating a significant BW enhancement compared with both the previous metal- and graphene- based THz absorbers.
Abstract: In this study, by using an equivalent circuit method, a polarization-insensitive terahertz (THz) absorber based on multilayer graphene-based metasurfaces (MGBMs) is systematically designed, providing an extremely broad absorption bandwidth (BW). The proposed absorber is a compact, three-layer structure, comprising square-, cross-, and circular-shaped graphene metasurfaces embedded between three separator dielectrics. The equivalent-conductivity method serves as a parameter retrieval technique to characterize the graphene metasurfaces as the components of the proposed circuit model. Good agreement is observed between the full-wave simulations and the equivalent-circuit predictions. The optimum MGBM absorber exhibits >90% absorbance in an extremely broad frequency band of 0.55–3.12 THz (BW=140%). The results indicate a significant BW enhancement compared with both the previous metal- and graphene-based THz absorbers, highlighting the capability of the designed MGBM absorber. To clarify the physical mechanism of absorption, the surface current and the electric-field distributions, as well as the power loss density of each graphene metasurface, are monitored and discussed. The MGBM functionality is evaluated under a wide range of incident wave angles to prove that the proposed absorber is omnidirectional and polarization-insensitive. These superior performances guarantee the applicability of the MGBM structure as an ultra-broadband absorber for various THz applications.
TL;DR: In this article, the authors used gradient and multi-layered porous media (GPM and MLPM) with optimized properties and arrangement to maximize the heat transfer and minimize the pressure drop.
TL;DR: An integrated hybrid approach based on data envelopment analysis (DEA) and mathematical programming method to design a resilient supply chain and the results indicate the validation of proposed model and the impact of various resiliency strategies.