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A clustering-based repair shop design for repairable spare part supply systems
( Elsevier Ltd , 2018 , Article)In this study, we address the design problem of a single repair shop in a repairable multi-item spare part supply system. We propose a sequential solution heuristic to solve the joint problem of resource pooling, inventory ... -
A hybrid optimization-simulation approach for robust weekly aircraft routing and retiming
( Elsevier Ltd , 2017 , Article)We address the robust weekly aircraft routing and retiming problem, which requires determining weekly schedules for a heterogeneous fleet that maximizes the aircraft on-time performance, minimizes the total delay, and ... -
A low-cost test rig for impact experiments on a dummy head
( Elsevier Ltd , 2019 , Article)Anthropomorphic test dummies are commonly used to evaluate the potential harm to humans due to dangerous scenarios, such as that due to car accidents. Furthermore, they have been used in sports to evaluate the efficacy of ... -
A model and optimization-based heuristic for the operational aircraft maintenance routing problem
( Elsevier Ltd , 2016 , Article)This paper investigates the Operational Aircraft Maintenance Routing Problem (OAMRP). Given a set of flights for a specific homogeneous fleet type, this short-term planning problem requires building feasible aircraft routes ... -
A model for capacitated green vehicle routing problem with the time-varying vehicle speed and soft time windows
( Elsevier Ltd , 2019 , Article)This paper investigates the capacitated green vehicle routing problem (GVRP) with time-varying vehicle speed and soft time windows. The GVRP is developed as a multi-objective mixed integer nonlinear programming (MINLP) ... -
A novel approach for developing composite eco-efficiency indicators: The case for US food consumption
( Elsevier Ltd , 2021 , Article)Eco-efficiency analysis can provide useful information for sustainability benchmarking of products and sectors while assessing and monitoring their economic and environmental performances. The eco-efficiency is defined as ... -
A novel axially half corrugated thin-walled tube for energy absorption under Axial loading
( Elsevier Ltd , 2019 , Article)In this paper, tubes with different axial corrugations were studied under axial loading. Accordingly, a new axially half-corrugated thin-walled tube was developed to improve the energy absorption characteristics. The forming ... -
A practical solution approach for the green vehicle routing problem
( Elsevier Ltd , 2017 , Article)Green vehicle routing (GVRP) is an active research area that is concerned with the development and analysis of distribution activities with eco-friendly vehicles. We propose a practical solution approach for the GVRP that ... -
A systematic review for sustainability of global liquified natural gas industry: A 10-year update
( Elsevier Ltd , 2021 , Article)This paper presents a comprehensive review and 10-years update of the sustainability research related to Liquefied Natural Gas (LNG) worldwide for the period between 2010 and 2020. Using the Scopus database, 467 articles, ... -
A two-level optimization approach for robust aircraft routing and retiming
( Elsevier Ltd , 2017 , Article)We investigate the Robust Aircraft Routing and Retiming Problem that is defined as follows. Given a set of flight legs to be served by a set of aircraft fleets, together with a tentative schedule, the problem requires ... -
A validated design methodology for a closed-loop subsonic wind tunnel
( Elsevier Ltd , 2014 , Article)A systematic investigation into the design and simulation of flow parameters in a closed-loop wind tunnel was carried out using Computational Fluid Dynamics (CFD). The analytical model for estimating pressure losses were ... -
Abandoned petroleum wells as sustainable sources of geothermal energy
( Elsevier Ltd , 2014 , Article)A reliable heat transfer model was developed to determine the performance of a double pipe heat exchanger retrofitted to an abandoned petroleum well. The proposed model is compared against an analytical heat transfer model ... -
Age replacement models: A summary with new perspectives and methods
( Elsevier Ltd , 2017 , Article Review)Age replacement models are fundamental to maintenance theory. This paper summarizes our new perspectives and hods in age replacement models: First, we optimize the expected cost rate for a required availability level and ... -
Airflow assessment in a naturally ventilated greenhouse equipped with wind towers: numerical simulation and wind tunnel experiments
( Elsevier Ltd , 2019 , Article)In this study, the air change rate and airflow distribution inside a greenhouse equipped with wind towers were analyzed using Computational Fluid Dynamics (CFD) simulations, considering different wind speeds (1–5 m/s) and ... -
An experimental investigation into crushing behavior of radially stiffened GFRP composite tubes
( Elsevier Ltd , 2014 , Article)State-of-the-art studies of the crushing of composite tubes reveal different factors affecting their crashworthiness. Of those factors, the geometrical property of the tube is of great interest. In the current study, four ... -
An integrated resource allocation and distribution model for pre-disaster planning
( Elsevier Ltd , 2016 , Article)In this paper, a three-echelon network model is proposed for integrated emergency preparedness and response planning for the distribution of emergency supplies. The model minimizes the social cost to identify a set of ... -
Artificial neural network-based kinematics Jacobian solution for serial manipulator passing through singular configurations
( Elsevier Ltd , 2009 , Article)Singularities and uncertainties in arm configurations are the main problems in kinematics robot control resulting from applying robot model, a solution based on using Artificial Neural Network (ANN) is proposed here. The ... -
Biocorrosion behavior of biodegradable nanocomposite fibers coated layer-by-layer on AM50 magnesium implant
( Elsevier Ltd , 2016 , Article)This article demonstrates the use of hybrid nanofibers to improve the biodegradation rate and biocompatibility of AM50 magnesium alloy. Biodegradable hybrid membrane fiber layers containing nano-hydroxyapatite (nHA) particles ... -
Biomechanical design of a composite femoral prosthesis to investigate the effects of stiffness, coating length, and interference press fit
( Elsevier Ltd , 2018 , Article)Traditionally, high stiffness hip prostheses are associated with aseptic loosening. Hence, the effects of stiffness, coating length, and interference press fit on load sharing and micro-movements are investigated for a ... -
Burden of diabetes mellitus attributable to demographic levels in Qatar: An emerging public health problem
( Elsevier Ltd , 2014 , Article)Diabetes is one of the main contributors to ill health and premature mortality worldwide and its prevalence has been rising during the last decades. Aim The aim of the present study was to quantify the burden of disease ...