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We report on a wave vector filtering (WVF) effect for electrons across a hybrid magnetic-electric-barrier (MEB) nanostructure with a δ-doping, which can be experimentally realized by depositing a ferromagnetic (FM) stripe and a Schottky-metal (SM) stripe on top and bottom of a GaAs/AlxGa1-xAs heterostructure, respectively, and using molecular beam epitaxy (MBE), An apparent WVF effect still exists...
The vehicle routing problem with due times is considered. The vehicles are supposed to visit customers within the due times, and a penalty cost is imposed in case the vehicle arrives past the due times. A mixed integer programming formulation and a hybrid tabu search (HTS) is presented to minimize the weighted sum of the traveling time and the tardiness of the service customers. HTS is compared with...
The vehicle routing problem with simultaneous delivery and pick-up service (VRPSPD) was considered in this paper. A hybrid heurictics was proposed to determine the optimal set of routes to totally satisfy both the delivery and pick-up demand of the customer population. An extensive numerical experiment was performed on benchmark problem instances available in literature. It is found that the proposed...
This article has been retracted: please see Elsevier Policy on Article Withdrawal (http://www.elsevier.com/locate/withdrawalpolicy). This article has been retracted at the request of the Editor-in-Chief. The authors have duplicated significant parts of a paper published in Fuzzy Set. Syst., 82 (1996) 307–317, doi:10.1016/0165-0114(95)00276-6. One of the conditions of submission of a paper for publication...
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