Showing papers by "Iran University of Science and Technology published in 2015"
TL;DR: In this article, a residential energy hub model is proposed which receives electricity, natural gas and solar radiation at its input port to supply required electrical, heating and cooling demands at the output port.
411 citations
TL;DR: In this article, a comprehensive review on different methods of preparation and stabilization of magnetorheological fluids is presented, and rheological models and application of MR fluids are discussed briefly in this study.
340 citations
TL;DR: In this article, a review of ultraviolet photodetectors (PDs) is presented, with a focus on the unique advantages of different UV PDs, current device schemes and demonstrations, novel structures and new material compounds which are used to fabrication of PDs.
288 citations
TL;DR: This paper presents a perspective on power quality issues through railway electrification development and investigates the necessity of power quality and system requirements for appropriate power quality.
Abstract: Since the beginning of railway electrification, power quality has been a main problem in railway networks because of their special characteristics. Many ways of power quality improvement have been investigated and applied to ac and dc traction systems through railway electrification history. This paper presents a perspective on power quality issues through railway electrification development and investigates the necessity of power quality and system requirements for appropriate power quality. Compensation strategies are classified and compared. This aims to provide a comprehensive perspective of the power quality issue in railway power/distribution networks for researchers and engineers working on railway electrification. Less than 100 research articles are referenced for researchers to obtain good background information.
264 citations
TL;DR: In this article, a new index was formulated for assessing severity of heavy metal pollution in aquatic environments, which is more reliable and logical compared with other investigated indices for evaluating heavy metals pollution in sediments of aquatic environments.
254 citations
TL;DR: Magnetic nanofluids (MNFs) are suspensions which are comprised of a non-magnetic base fluid and magnetic nanoparticles and can be controlled by applying magnetic fields as mentioned in this paper.
247 citations
TL;DR: The computational models incorporating the Johnson-Cook damage model could predict the plateau stress and maximum stress at the first peak with less than 18% error and the computationally predicted deformation modes were in good agreement with the results of scaling law analysis.
Abstract: Since the advent of additive manufacturing techniques, regular porous biomaterials have emerged as promising candidates for tissue engineering scaffolds owing to their controllable pore architecture and feasibility in producing scaffolds from a variety of biomaterials. The architecture of scaffolds could be designed to achieve similar mechanical properties as in the host bone tissue, thereby avoiding issues such as stress shielding in bone replacement procedure. In this paper, the deformation and failure mechanisms of porous titanium (Ti6Al4V) biomaterials manufactured by selective laser melting from two different types of repeating unit cells, namely cubic and diamond lattice structures, with four different porosities are studied. The mechanical behavior of the above-mentioned porous biomaterials was studied using finite element models. The computational results were compared with the experimental findings from a previous study of ours. The Johnson–Cook plasticity and damage model was implemented in the finite element models to simulate the failure of the additively manufactured scaffolds under compression. The computationally predicted stress–strain curves were compared with the experimental ones. The computational models incorporating the Johnson–Cook damage model could predict the plateau stress and maximum stress at the first peak with less than 18% error. Moreover, the computationally predicted deformation modes were in good agreement with the results of scaling law analysis. A layer-by-layer failure mechanism was found for the stretch-dominated structures, i.e. structures made from the cubic unit cell, while the failure of the bending-dominated structures, i.e. structures made from the diamond unit cells, was accompanied by the shearing bands of 45°.
247 citations
TL;DR: A mathematical model which is composed of JSSP and CFRP, simultaneously and since the problem under study is NP-hard, a two stage Ant Colony Algorithm (ACA) is proposed, showing that ACA is an efficient meta-heuristic for this problem, especially for the large-sized problems.
177 citations
07 Jun 2015
TL;DR: Li et al. as mentioned in this paper proposed a method for real-time anomaly detection and localization in crowded scenes, where each video is defined as a set of non-overlapping cubic patches, and is described using two local and global descriptors.
Abstract: In this paper, we propose a method for real-time anomaly detection and localization in crowded scenes. Each video is defined as a set of non-overlapping cubic patches, and is described using two local and global descriptors. These descriptors capture the video properties from different aspects. By incorporating simple and cost-effective Gaussian classifiers, we can distinguish normal activities and anomalies in videos. The local and global features are based on structure similarity between adjacent patches and the features learned in an unsupervised way, using a sparse auto-encoder. Experimental results show that our algorithm is comparable to a state-of-the-art procedure on UCSD ped2 and UMN benchmarks, but even more time-efficient. The experiments confirm that our system can reliably detect and localize anomalies as soon as they happen in a video.
160 citations
TL;DR: A research scale fluidized-bed reactor has been built and used to study the effect of steam/biomass ratio, time duration of experiments, reactor temperature, and biomass particle size on hydrogen yield and tar content in produced syngas during steam gasification of biomass as discussed by the authors.
153 citations
TL;DR: Simulation results show that the proposed scheduling method leads to significant reduction in energy costs for diverse load scenarios with the electricity demand from the grid, and the deployment of the proposed method is advantageous for both users and utilities.
TL;DR: This paper proposes a novel method, named the Classifier Selection Based on Clustering (CSBS), for ensemble creation, which uses the clustering of classifiers technique and investigates the influence of cluster number on the performance of the CSBC method.
TL;DR: In this article, the Edge Notched Disc Bend (ENDB) is proposed for experimental determination of KIIIc, which is a circular disc containing an edge crack created along the disc diameter which is subjected to three-point bend loading.
TL;DR: In this article, the potential of Platanus orientalis leaves powder (POLP) to remove methylene blue (MB), a cationic dye, from aqueous solution was evaluated.
TL;DR: This paper discusses literature related to different methodologies to optimize AGV systems for the two significant problems of scheduling and routing at manufacturing, distribution, transshipment and transportation systems.
Abstract: Automated guided vehicles (AGVs) are used as a material handling device in flexible manufacturing systems. Traditionally, AGVs were mostly used at manufacturing systems, but currently other applications of AGVs are extensively developed in other areas, such as warehouses, container terminals and transportation systems. This paper discusses literature related to different methodologies to optimize AGV systems for the two significant problems of scheduling and routing at manufacturing, distribution, transshipment and transportation systems. We categorized the methodologies into mathematical methods (exact and heuristics), simulation studies, meta-heuristic techniques and artificial intelligent based approaches.
TL;DR: In this paper, the Darcy-Brinkman-Forchheimer relation has been used to evaluate the performance of nanoparticles and porous media for enhancing heat transfer inside an annulus.
TL;DR: The future success of CNTs as vectors in vivo and in clinical application will depend on achievement of efficacious therapy with minimal adverse effects and avoidance of possible toxic and environmentally damaging effects.
Abstract: Introduction: Carbon nanotubes (CNT) have recently been studied as novel and versatile drug and gene delivery vehicles. When CNT are suitably functionalized, they can interact with various cell typ...
TL;DR: To implement Demand Response (DR) schedules, incentive-based payment in the form of offered packages of price and DR quantity collected by Demand Response Providers (DRPs) is used.
TL;DR: In this paper, the authors investigated the performance and emission characteristics of homogeneous charge compression ignition (HCCI) engines fueled with oxygenated fuels (i.e., butanol and ethanol).
TL;DR: In this article, mixed mode I/II fracture toughness of five modified asphalt mixtures containing poly phosphoric acid (PPA), Styrene Butadiene Styrene (SBS), anti-stripping agent, crumb rubber (CR) and F-T paraffin wax (Sasobit) was investigated experimentally using a large number of cracked semi-circular bend (SCB) specimens.
TL;DR: In this article, the effect of 1-ethyl-3 methylimidazolium tetrafluoroborate ([Emim][BF 4 ]) ionic liquid on separation performance and transport properties of poly(ether-b-amide6) (Pebax1657) at different operating pressures from 2 to 20 bar and temperatures from 25 to 65°C.
TL;DR: A detailed process model was developed to simulate the air-steam gasification of biomass in a bubbling fluidized bed for hydrogen and syngas production by coupling Aspen Plus simulator and dedicated FORTRAN subroutines as discussed by the authors.
TL;DR: In this article, a multi-period integrated framework is developed for generation expansion planning, transmission expansion planning (TEP), and natural gas grid expansion planning for large-scale systems, and the proposed framework performance is investigated by applying it to a typical electric-NG combined grid.
Abstract: In this paper, a multi-period integrated framework is developed for generation expansion planning (GEP), transmission expansion planning (TEP), and natural gas grid expansion planning (NGGEP) problems for large-scale systems. New nodal generation requirements, new transmission lines, and natural gas (NG) pipelines are simultaneously obtained in a multi-period planning horizon. In addition, a new approach is proposed to compute NG load flow by considering grid compressors. In order to solve the large-scale mixed integer nonlinear problem, a framework is developed based on genetic algorithms. The proposed framework performance is investigated by applying it to a typical electric-NG combined grid. Moreover, in order to evaluate the effectiveness of the proposed framework for real-world systems, it has been applied to the Iranian power and NG system, including 98 power plants, 521 buses, 1060 transmission lines, and 92 NG pipelines. The results indicate that the proposed framework is applicable for large-scale and real-world systems.
TL;DR: In this article, the magnetorheological fluids are classified as smart materials with controllable rheological properties, and the fast growing application of magnetors in recent years has increased the...
Abstract: The magnetorheological fluids are classified as smart materials with controllable rheological properties. The fast growing application of magnetorheological fluids in recent years has increased the...
TL;DR: In this article, the effects of diesel injection strategies on the combustion and pollutant emission characteristics of a modified heavy-duty reactivity controlled compression ignition engine fueled with natural gas/diesel are studied.
TL;DR: In this article, a green, rapid, convenient and eco-friendly method for the synthesis of 2,4,5-trisubstituted imidazoles is described.
Abstract: In the present work, a green, rapid, convenient and eco-friendly method for the synthesis of 2,4,5-trisubstituted imidazoles is described. In this method, we used 1,2-diketone or α-hydroxy ketone, an aldehyde and ammonium acetate in the presence of graphene oxide–chitosan bionanocomposite, which acted as an efficient nanocatalyst. This protocol has many advantages such as short reaction time, high yield, easy separation of the catalyst and solvent-free condition. We used differential scanning calorimetry (DSC), Fourier transform infrared spectroscopy (FT-IR) and atomic force microscopy (AFM) to confirm that the nanocomposite was formed, and FT-IR, 1H and 13C NMR analyses were performed for the confirmation of the synthesized products.
TL;DR: In this article, a stair-shaped dielectric resonator antenna (DRA) with a wideband circular polarization (CP) radiation is introduced for wireless local area network (WLAN) applications.
Abstract: A circularly polarized stair-shaped dielectric resonator antenna (DRA) with a wideband circular polarization (CP) radiation is introduced for wireless local area network (WLAN) applications. This antenna is implemented by using two rectangular dielectric resonators (DRs), which are joined together to form a stair-shaped dielectric resonator antenna (DRA). In this structure, the excitation of multiple orthogonal modes leads to a wideband CP bandwidth. Measured results show that the proposed antenna has an axial ratio (AR) bandwidth of 22% (5.2–6.5 GHz), an impedance bandwidth of 37% (4.6–6.7 GHz), and a peak gain of 5.7 dB. In addition, the antenna radiation efficiency of more than 90% is achieved.
TL;DR: In this paper, a coupled Computational Fluid Dynamics and Discrete Element Method (CFD-DEM) approach is presented to simulate the cuttings transport considering the dynamic collision process.
TL;DR: In this paper, an integrated operational planning of a distribution system is presented in order to cope with the increasing complexity of distribution system complexity due to technological innovation, renewable Distributed Generation (DG) and responsive loads.
TL;DR: In this article, a new test configuration called the edge notched disc bend specimen is suggested for investigating mixed mode I/III fracture behavior, which is a circular disc containing an inclined edge crack thorough the diameter and is subjected to three point bend loading.