Browsing Mechanical & Industrial Engineering by Publication Date
Now showing items 61-80 of 1210
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MIP models for minimizing total tardiness in a two-machine flow shop
( Palgrave Macmillan Ltd. , 2013 , Article)We propose compact mixed-integer programming models for the NP-hard problem of minimizing tardiness in a two-machine flow shop. Also, we propose valid inequalities that aim at tightening the models' representations. We ... -
An assignment-based lower bound for a class of two-machine flow shop problems
(2013 , Article)We present an assignment-based lower bound that is valid for a wide class of two-machine flow shop problems with a regular additive performance criterion. We provide empirical evidence that this new bound consistently ... -
A model for enhancing robustness of aircraft and passenger connections
( Elsevier , 2013 , Article)Airlines schedules are often subject to various uncontrollable factors that cause disruptions and delays. These delays not only constitute, for many passengers, the painful part of air travel, but also represent for airlines ... -
Enhanced compact models for the connected subgraph problem and for the shortest path problem in digraphs with negative cycles
(2013 , Article)We investigate the minimum-weight connected subgraph problem. The importance of this problem stems from the fact that it constitutes the backbone of many network design problems having applications in several areas including ... -
Improved bounds for hybrid flow shop scheduling with multiprocessor tasks
(2013 , Article)In this paper, we investigate the problem of minimizing makespan in a multistage hybrid flow-shop scheduling with multiprocessor tasks. To generate high-quality approximate solutions to this challenging NP-hard problem, ... -
A branch-and-price algorithm for the two-stage guillotine cutting stock problem
( Palgrave Macmillan Ltd. , 2013 , Article)We investigate the two-stage guillotine two-dimensional cutting stock problem. This problem commonly arises in the industry when small rectangular items need to be cut out of large stock sheets. We propose an integer ... -
A lifted compact formulation for the daily aircraft maintenance routing problem
( INFORMS Inst.for Operations Res.and the Management Sciences , 2013 , Article)Given a set of flights for a specific fleet type the aircraft routing problem (ARP) determines the flying sequence for each individual aircraft while incorporating specific considerations of minimum turn time maintenance ... -
Greedy algorithms and metaheuristics for a multiple runway combined arrival-departure aircraft sequencing problem
( Elsevier , 2013 , Article)This paper examines the Aircraft Sequencing Problem (ASP) over multiple runways, under mixed mode operations with the objective of minimizing the total weighted tardiness of aircraft landings and departures simultaneously. ... -
The effects of gas tungsten arch welding on the corrosion and mechanical properties of AA 6061 T6
(2013 , Article)Corrosion of welded and un-welded Aluminum Alloy 6061 T6 was investigated by immersing specimens in 3.5% (wt) NaCl solution. Potentiodynamic and open circuit potential measurements were conducted. The mechanical properties ... -
Using hierarchical composite approach to improve mechanical response of Mg and Mg–Bi2O3 nano-composites
( Elsevier, Ltd , 2013 , Article)Novel Mg nano-composites reinforced with either Bi2O3 nano-particles or hybrid Al–Bi2O3 particles (Bi2O3 nano-particles hybridized with Al using ball milling) have been synthesized, in this work, through powder metallurgy ... -
Potential of geothermal energy for electricity generation in Qatar
( Canadian Institute of Mining, Metallurgy and Petroleum , 2013 , Conference Paper)There is general acceptance that climate change, which is the most important challenge facing humanity, is anthropogenic and attributed to fossil fuel consumption. Therefore, improving the performance of our existing energy ... -
Recycling low grade waste heat to electricity
( Canadian Institute of Mining, Metallurgy and Petroleum , 2013 , Conference Paper)Most mining and metallurgical industries produce relatively large quantities of low grade waste heat which they vent, for the most part, to the environment. To date, little is being done to recover some of this heat and ... -
Microstructure, thermal and mechanical response of AZ51/Al2O3 nanocomposite with 2 wt.% Ca addition
( Elsevier, Ltd , 2013 , Article)In the present study, new AZ51/Al2O3–2Ca magnesium nanocomposite was successfully synthesized by simultaneously adding 2wt.% aluminum, 2wt.% Ca and 1.5vol.% nanosized Al2O3 (50nm) into AZ31 matrix using a disintegrated ... -
Centrifugal Compressor Spiral Dry Gas Seal Simulation Working at Reverse Rotation
( Elsevier Ltd , 2013 , Conference Paper)Unidirectional dry gas seal may experiences reverse rotation when equipped in a centrifugal compressor. This paper describes how the reverse rotation effects on the spiral unidirectional dry gas seal performance and pressure ... -
Three Dimensional Computational Study for Spiral Dry Gas Seal with Constant Groove Depth and Different Tapered Grooves
( Elsevier Ltd , 2013 , Conference Paper)The three dimensional simulation for dry gas seal with constant depth spiral grooves and with different taper grooves is done using ANSYS FLUENT CFD code. Grid independence study and code validation are done with experimental ... -
An experimental investigation into mechanical behavior of hybrid and nonhybrid composite semi-elliptical springs
( Elsevier, Ltd , 2013 , Article)This study introduces a new composite semi-elliptical suspension spring by utilizing fiber reinforced composite strength in principal direction instead of shear direction. Three types of composites were tested, namely, ... -
Enhancing Tensile and Compressive Strength of AZ41 Magnesium Alloy by Adding Nano-Sized Al2O3
( John Wiley & Sons, Inc. , 2014 , Book chapter) -
A new forecasting scheme for evaluating long-term prediction performances in supply chain management
( John Wiley & Sons Ltd , 2014 , Article)Supply chain management (SCM) practitioners in inventory sites are often required to predict the future sales of products in order to meet customer demands and reduce inventory costs simultaneously. Although a variety of ... -
A new forecasting scheme for evaluating long-term prediction performances in supply chain management
( John Wiley & Sons, Ltd. , 2014 , Article)Supply chain management (SCM) practitioners in inventory sites are often required to predict the future sales of products in order to meet customer demands and reduce inventory costs simultaneously. Although a variety of ... -
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 ...