Current Issue : October - December Volume : 2014 Issue Number : 4 Articles : 5 Articles
The cross-docking system is a new distribution strategy which can reduce inventories, lead times, and improve responding time\nto customers. This paper considers biobjective problem of truck scheduling in cross-docking systems with temporary storage.\nThe objectives are minimizing both makespan and total tardiness. For this problem, it proposes a multiobjective iterated greedy\nalgorithmemploying advance features such asmodified crowding selection, restart phase, and local search. To evaluate the proposed\nalgorithm for performance, it is compared with two available algorithms, subpopulation particle swarm optimization-II and\nstrength Pareto evolutionary algorithm-II.Thecomparison shows that the proposedmultiobjective iterated greedy algorithmshows\nhigh performance and outperforms the other two algorithms....
The nuclear ââ?¬Å?renaissanceââ?¬Â that is taking place worldwide concerns the new build of GW size reactor plants, but smaller GenIII+\nNPP (SmallModular Reactors, SMR) are on the verge to be commercially available and are raising increasing public interest. These\nreactor concepts rely on the pressurized water technology, capitalizing on thousands of reactor-years operations and enhancing the\npassive safety features, thanks to the smaller plant and equipment size. On the other hand, smaller plant size pays a loss of economy\nof scale,which might have a relevant impact on the generation costs of electricity, given the capital-intensive nature of nuclear power\ntechnology. Thepaper explores the economic advantages/disadvantages ofmultiple SMRcompared to alternative large plants of the\nsame technology and equivalent total power installed. The metrics used in the evaluation is twofold, as appropriate for liberalized\nmarkets of capital and electricity: investment profitability and investment risk are assessed, from the point of view of the plant\nowner. Results show that multiple SMR deployed on the same site may prove competitive with investment returns of larger plants,\nwhile offering, in addition, unique features that mitigate the investment risk....
The paper addresses enhanced oil recovery in chalk and sandstone rocks by CO2 injection, with different wettability, porosity, and\npermeability as well as injection rate and flooding conditions. Results indicate that an increase in Bond number has a positive\neffect on oil recovery whereas for capillary number, there is a limit in which recovery is improving. This limit is estimated when the\npressure drop by viscous force is approximately equal to the threshold balance between capillary and gravity forces.Adimensionless\ngroup is proposed that combines the effect of capillarity, injectionrate,permeability, andCO2 diffusion on the oil recovery. Recovery\nfrom all experiments in this study and reported data in the literature shows a satisfactory relationship with the proposed group....
Nowadays, the demand of third-party logistics provider becomes an increasingly important issue for companies to improve their\ncustomer service and to decrease logistics costs. This paper presents an integrated fuzzy approach for the evaluation and selection\nof 3rd party logistics service providers. This method consists of two techniques: (1) use fuzzy analytic hierarchy process to identify\nweights of evaluation criteria; (2) apply fuzzy technique for order preference by similarity to ideal solution (TOPSIS) method to\nevaluate and sequence alternatives and to make the final selection. Finally, an actual industrial application is performed in logistics\ndepartment of a tiremanufacturing company. For this, first, eight logistics supplier selection criteria were determined, and then the\nbest alternative among seven logistics service provider companies was selected by the proposed method....
Low salinity water injection (LSWI) is gaining popularity as an improved oil recovery technique in both secondary and tertiary\ninjection modes. The objective of this paper is to investigate the main mechanisms behind the LSWI effect on oil recovery from\ncarbonates through history-matching of a recently published coreflood. This paper includes a description of the seawater cycle\nmatch and two proposed methods to history-match the LSWI cycles using the UTCHEM simulator.The sensitivity of residual oil\nsaturation, capillary pressure curve, and relative permeability parameters (endpoints and Corey�s exponents) on LSWI is evaluated\nin thiswork. Results showed thatwettability alteration is still believed to be themain contributor to the LSWI effect on oil recovery in\ncarbonates through successfully historymatching both oil recovery and pressure drop data.Moreover, tuning residual oil saturation\nand relative permeability parameters including endpoints and exponents is essential for a good data match. Also, the incremental\noil recovery obtained by LSWI is mainly controlled by oil relative permeability parameters rather than water relative permeability\nparameters.Thefindings of this paper help to gainmore insight into this uncertain IOR technique and propose amechanistic model\nfor oil recovery predictions....
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